{"id":18853,"date":"2025-12-12T02:41:44","date_gmt":"2025-12-12T02:41:44","guid":{"rendered":"https:\/\/www.zmdetech.com\/?p=18853"},"modified":"2025-12-12T02:42:14","modified_gmt":"2025-12-12T02:42:14","slug":"soudage-des-aciers-de-construction-chinois-courants-q235-gb-t-700-vs-q345-gb-t-1591-guide-pratique-complet-avec-equivalents-internationaux-astm-en-jis","status":"publish","type":"post","link":"https:\/\/www.zmdetech.com\/fr\/connaissances\/soudage-des-aciers-de-construction-chinois-courants-q235-gb-t-700-vs-q345-gb-t-1591-guide-pratique-complet-avec-equivalents-internationaux-astm-en-jis\/","title":{"rendered":"Soudage des aciers de construction chinois courants : Q235 (GB\/T 700) vs Q345 (GB\/T 1591) - Guide pratique complet avec \u00e9quivalents internationaux (ASTM, EN, JIS)"},"content":{"rendered":"<h4 class=\"wp-block-heading\">1. Introduction<\/h4>\r\n \r\n\r\nQ235 et Q345 sont les deux aciers de construction les plus utilis\u00e9s en Chine et dans toute l'Asie. Ensemble, ils repr\u00e9sentent plus de 70 % de tout l'acier consomm\u00e9 dans la construction, les ponts, les appareils \u00e0 pression, les machines et la fabrication g\u00e9n\u00e9rale.\r\n\r\n \r\n\r\nCet article fournit une r\u00e9f\u00e9rence unique, pr\u00eate \u00e0 l'emploi, qui compare :\r\n\r\n \r\n<ul class=\"wp-block-list\">\r\n \t<li>Q235A\/B\/C\/D (GB\/T 700-2006)<\/li>\r\n \r\n \t<li>Q345A\/B\/C\/D\/E (GB\/T 1591-2018) et leurs \u00e9quivalents internationaux directs :<\/li>\r\n \r\n \t<li>ASTM A36 \/ A572 Gr.50<\/li>\r\n \r\n \t<li>EN S235JR \/ S355JR \/ S355J2<\/li>\r\n \r\n \t<li>JIS SS400 \/ SM490A<\/li>\r\n<\/ul>\r\n \r\n\r\nToutes les recommandations en mati\u00e8re de soudage sont bas\u00e9es sur les normes nationales chinoises, AWS D1.1, EN 1011-2, et sur les pratiques de fabrication asiatiques r\u00e9elles.\r\n\r\n \r\n<figure class=\"wp-block-image\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone wp-image-18854 size-full\" src=\"https:\/\/www.zmdetech.com\/wp-content\/uploads\/Q235-Q345-Structure-Steel-1.avif\" alt=\"\" width=\"750\" height=\"750\" \/><\/figure>\r\n \r\n<h4 class=\"wp-block-heading\">2. Composition chimique et \u00e9quivalent carbone (CEV \/ PCM)<\/h4>\r\n \r\n<figure class=\"wp-block-table\">\r\n<table class=\"has-fixed-layout\">\r\n<thead>\r\n<tr>\r\n<th>Acier<\/th>\r\n<th>C max<\/th>\r\n<th>Si max<\/th>\r\n<th>Mn max<\/th>\r\n<th>P max<\/th>\r\n<th>S max<\/th>\r\n<th>CEV typ. (IIW)<\/th>\r\n<th>PCM typique<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>Q235A<\/td>\r\n<td>0.22<\/td>\r\n<td>0.35<\/td>\r\n<td>1.40<\/td>\r\n<td>0.045<\/td>\r\n<td>0.050<\/td>\r\n<td>\u22640.38<\/td>\r\n<td>\u22640.22<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Q235B\/C\/D 0,20<\/td>\r\n<td>0.35<\/td>\r\n<td>1.40<\/td>\r\n<td>0.035-0.040<\/td>\r\n<td>0.030-0.040<\/td>\r\n<td>\u22640.37<\/td>\r\n<td>\u22640.20<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Q345A\/B 0,20<\/td>\r\n<td>0.50<\/td>\r\n<td>1.70<\/td>\r\n<td>0.035<\/td>\r\n<td>0.035<\/td>\r\n<td>\u22640.44<\/td>\r\n<td>\u22640.24<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Q345C\/D\/E 0,18<\/td>\r\n<td>0.50<\/td>\r\n<td>1.70<\/td>\r\n<td>0.030<\/td>\r\n<td>0.030<\/td>\r\n<td>\u22640.42<\/td>\r\n<td>\u22640.22<\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n \r\n\r\n\u2192 Le Q235 pr\u00e9sente une excellente soudabilit\u00e9 similaire \u00e0 celle de l'ASTM A36 \/ S235JR (aucun pr\u00e9chauffage n'est n\u00e9cessaire dans la plupart des cas).\r\n\r\n \r\n\r\n\u2192 Q345 est comparable \u00e0 S355JR \/ A572 Gr.50 (pr\u00e9chauffage recommand\u00e9 \u00e0 partir de certaines \u00e9paisseurs).\r\n\r\n \r\n<h4 class=\"wp-block-heading\">3. \u00c9quivalences de notes internationales (pour la r\u00e9daction des sp\u00e9cifications)<\/h4>\r\n \r\n<figure class=\"wp-block-table\">\r\n<table class=\"has-fixed-layout\">\r\n<thead>\r\n<tr>\r\n<th>Chine (GB)<\/th>\r\n<th>\u00c9TATS-UNIS (ASTM)<\/th>\r\n<th>Europe (EN)<\/th>\r\n<th>Japon (JIS)<\/th>\r\n<th>Cor\u00e9e (KS)<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>Q235A<\/td>\r\n<td>A36, A283 Gr.C<\/td>\r\n<td>S235JR<\/td>\r\n<td>SS400<\/td>\r\n<td>SS400<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Q235B<\/td>\r\n<td>A36<\/td>\r\n<td>S235J0 \/ S235J2<\/td>\r\n<td>SS400<\/td>\r\n<td>SS400<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Q345B<\/td>\r\n<td>A572 Gr.50<\/td>\r\n<td>S355JR<\/td>\r\n<td>SM490A<\/td>\r\n<td>SM490A<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Q345D<\/td>\r\n<td>A572 Gr.50<\/td>\r\n<td>S355J2<\/td>\r\n<td>SM490YA<\/td>\r\n<td>SM490YA<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n \r\n<h4 class=\"wp-block-heading\">4. Proc\u00e9d\u00e9s de soudage et m\u00e9taux d'apport recommand\u00e9s<\/h4>\r\n \r\n<figure class=\"wp-block-table\">\r\n<table class=\"has-fixed-layout\">\r\n<thead>\r\n<tr>\r\n<th>Acier<\/th>\r\n<th>Proc\u00e9dures pr\u00e9f\u00e9r\u00e9es (par ordre de popularit\u00e9 en Chine)<\/th>\r\n<th>Classification des charges AWS \/ EN<\/th>\r\n<th>\u00c9lectrodes courantes chinoises<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>Q235<\/td>\r\n<td>SMAW \u2192 GMAW\/MIG \u2192 FCAW \u2192 SAW<\/td>\r\n<td>E7018, ER70S-6, E71T-1<\/td>\r\n<td>J422 (E4303), J426 (E4316), CHE427 (E5015)<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Q345<\/td>\r\n<td>SMAW \u2192 GMAW\/MIG \u2192 FCAW \u2192 SAW<\/td>\r\n<td>E8018-C3, ER80S-G, E81T1-Ni1<\/td>\r\n<td>CHE507 (E5015), CHE557 (E5515), CHE607<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n \r\n<h4 class=\"wp-block-heading\">5. Exigences en mati\u00e8re de temp\u00e9rature de pr\u00e9chauffage et d'intervalle (EN 1011-2 et pratique chinoise)<\/h4>\r\n \r\n<figure class=\"wp-block-table\">\r\n<table class=\"has-fixed-layout\">\r\n<thead>\r\n<tr>\r\n<th>\u00c9paisseur combin\u00e9e (mm)<\/th>\r\n<th>Q235 (tous les grades)<\/th>\r\n<th>Q345A\/B<\/th>\r\n<th>Q345C\/D\/E (CEV \u22640,42)<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>\u226420<\/td>\r\n<td>Aucun<\/td>\r\n<td>Aucun<\/td>\r\n<td>Aucun<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>20-40<\/td>\r\n<td>Aucun<\/td>\r\n<td>50-100\u00b0C<\/td>\r\n<td>80-120\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>40-70<\/td>\r\n<td>50\u00b0C (en option)<\/td>\r\n<td>100-150\u00b0C<\/td>\r\n<td>100-150\u00b0C<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>&gt;70<\/td>\r\n<td>75-100\u00b0C<\/td>\r\n<td>120-175\u00b0C<\/td>\r\n<td>120-175\u00b0C<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n \r\n\r\nTemp\u00e9rature maximale d'interpassage : 250 \u00b0C pour les deux aciers (pour \u00e9viter la perte de t\u00e9nacit\u00e9).\r\n\r\n \r\n<h4 class=\"wp-block-heading\">6. Traitement thermique post-soudure (PWHT)<\/h4>\r\n \r\n<figure class=\"wp-block-table\">\r\n<table class=\"has-fixed-layout\">\r\n<thead>\r\n<tr>\r\n<th>Condition<\/th>\r\n<th>Q235<\/th>\r\n<th>Q345<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td><\/td>\r\n<td><\/td>\r\n<td><\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Fabrication normale (t \u2264 50 mm)<\/td>\r\n<td>Pas n\u00e9cessaire<\/td>\r\n<td>G\u00e9n\u00e9ralement non requis<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Sections lourdes ou retenue<\/td>\r\n<td>D\u00e9tente 550-620 \u00b0C en option<\/td>\r\n<td>550-620 \u00b0C \u00d7 1 h\/pouce recommand\u00e9<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Appareils \u00e0 pression (GB 150 \/ ASME)<\/td>\r\n<td>Suivez le code<\/td>\r\n<td>580-620 \u00b0C obligatoire dans de nombreux cas<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n \r\n<h4 class=\"wp-block-heading\">7. Param\u00e8tres de soudage typiques (fil solide GMAW ER70S-6 \/ ER80S-G)<\/h4>\r\n \r\n<figure class=\"wp-block-table\">\r\n<table class=\"has-fixed-layout\">\r\n<thead>\r\n<tr>\r\n<th>Acier<\/th>\r\n<th>\u00d8 du fil (mm)<\/th>\r\n<th>Courant (A)<\/th>\r\n<th>Tension (V)<\/th>\r\n<th>Apport de chaleur (kJ\/mm)<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>Q235<\/td>\r\n<td>1.2<\/td>\r\n<td>220-300<\/td>\r\n<td>26-32<\/td>\r\n<td>0.8-1.6<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Q345<\/td>\r\n<td>1.2<\/td>\r\n<td>240-320<\/td>\r\n<td>27-34<\/td>\r\n<td>1.0-2.0<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n<figure class=\"wp-block-image\"><img decoding=\"async\" class=\"alignnone wp-image-18855 size-full\" src=\"https:\/\/www.zmdetech.com\/wp-content\/uploads\/q235-q345-ss490-high-quality-universal-steel-1.webp\" alt=\"\" width=\"720\" height=\"720\" \/><\/figure>\r\n \r\n<h4 class=\"wp-block-heading\">8. D\u00e9fauts courants et pr\u00e9vention<\/h4>\r\n \r\n<figure class=\"wp-block-table\">\r\n<table class=\"has-fixed-layout\">\r\n<thead>\r\n<tr>\r\n<th>D\u00e9faut<\/th>\r\n<th>Principale cause de Q235\/Q345<\/th>\r\n<th>La pr\u00e9vention<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>Fissuration par le froid<\/td>\r\n<td>Hydrog\u00e8ne + retenue (Q345)<\/td>\r\n<td>Consommables \u00e0 faible teneur en hydrog\u00e8ne, pr\u00e9chauffage<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Absence de fusion<\/td>\r\n<td>Faible apport de chaleur, plaques \u00e9paisses<\/td>\r\n<td>Minimum 1,0 kJ\/mm, tissage ad\u00e9quat<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Distorsion excessive<\/td>\r\n<td>Apport de chaleur \u00e9lev\u00e9 sur du Q235 mince<\/td>\r\n<td>Sauter le soudage, s\u00e9quence de pas \u00e0 pas<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>D\u00e9chirure lamellaire<\/td>\r\n<td>Chargement \u00e0 travers l'\u00e9paisseur d'une plaque lourde<\/td>\r\n<td>Utilisez de l'acier de qualit\u00e9 Z (Q345D-Z35) si n\u00e9cessaire.<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>\r\n \r\n<h4 class=\"wp-block-heading\">9. Quel acier choisir ?<\/h4>\r\n \r\n<figure class=\"wp-block-table\">\r\n<table class=\"has-fixed-layout\">\r\n<thead>\r\n<tr>\r\n<th>Exigence<\/th>\r\n<th>Choisissez<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td>Fabrication g\u00e9n\u00e9rale, co\u00fbt critique<\/td>\r\n<td>Q235B (\u00e9quivalent \u00e0 A36\/SS400)<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Plus grande r\u00e9sistance, \u00e9paisseur mod\u00e9r\u00e9e<\/td>\r\n<td>Q345B (\u00e9quivalent \u00e0 S355JR)<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Service \u00e0 basse temp\u00e9rature (\u2264 -20 \u00b0C)<\/td>\r\n<td>Q235D ou Q345D\/E<\/td>\r\n<\/tr>\r\n<tr>\r\n<td>Structures offshore ou sismiques<\/td>\r\n<td>Q345D-Z25\/Z35 ou Q355J2<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<\/figure>","protected":false},"excerpt":{"rendered":"<p>Guide de soudage Q235 vs Q345 : pr\u00e9chauffage, m\u00e9taux d'apport, apport de chaleur, PWHT &amp; \u00e9quivalents internationaux (ASTM A36, A572 Gr.50, EN S235JR, S355JR, JIS SS400). Tableaux complets pour SMAW, GMAW, FCAW.<\/p>","protected":false},"author":1,"featured_media":18856,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[181],"tags":[270,268,267,276,271,283,288,272,284,281,282,278,274,269,258,218,226,257,275,277,286,279,280,287,289,273,290,285,191],"class_list":["post-18853","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-knowledge","tag-astm","tag-carbon-steel","tag-che507","tag-che577","tag-e7018","tag-e8018","tag-fcaw","tag-gmaw","tag-hight-heat","tag-j422","tag-j426","tag-jis","tag-low-heat","tag-low-hydrogen","tag-mig","tag-peb","tag-pre-engineered-building","tag-pre-fabricated-building","tag-q235","tag-q345","tag-s235","tag-s355","tag-saw","tag-sm490a","tag-smaw","tag-ss400","tag-steel-plate","tag-structure-steel","tag-welding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.1 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Welding of Common Chinese Structural Steels: Q235 (GB\/T 700) vs Q345 (GB\/T 1591) \u2013 Complete Practical Guide with International Equivalents (ASTM, EN, JIS) - ZMDE Steel Machinery<\/title>\n<meta name=\"description\" content=\"Q235 vs Q345 welding guide: preheat, filler metals, heat input, PWHT &amp; international equivalents (ASTM A36, A572 Gr.50, EN S235JR, S355JR, JIS SS400). Complete tables for SMAW, GMAW, FCAW.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.zmdetech.com\/fr\/connaissances\/soudage-des-aciers-de-construction-chinois-courants-q235-gb-t-700-vs-q345-gb-t-1591-guide-pratique-complet-avec-equivalents-internationaux-astm-en-jis\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Welding of Common Chinese Structural Steels: Q235 (GB\/T 700) vs Q345 (GB\/T 1591) \u2013 Complete Practical Guide with International Equivalents (ASTM, EN, JIS)\" \/>\n<meta property=\"og:description\" content=\"Q235 vs Q345 welding guide: preheat, filler metals, heat input, PWHT &amp; international equivalents (ASTM A36, A572 Gr.50, EN S235JR, S355JR, JIS SS400). Complete tables for SMAW, GMAW, FCAW.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.zmdetech.com\/fr\/connaissances\/soudage-des-aciers-de-construction-chinois-courants-q235-gb-t-700-vs-q345-gb-t-1591-guide-pratique-complet-avec-equivalents-internationaux-astm-en-jis\/\" \/>\n<meta property=\"og:site_name\" content=\"ZMDE Steel Machinery\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/facebook.com\/zmdemachinery\" \/>\n<meta property=\"article:published_time\" content=\"2025-12-12T02:41:44+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-12T02:42:14+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.zmdetech.com\/wp-content\/uploads\/Q-235-welding.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"600\" \/>\n\t<meta property=\"og:image:height\" content=\"397\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"ZMDE\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@zmdemachinery\" \/>\n<meta name=\"twitter:site\" content=\"@zmdemachinery\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"ZMDE\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/knowledge\\\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/knowledge\\\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\\\/\"},\"author\":{\"name\":\"ZMDE\",\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/#\\\/schema\\\/person\\\/96fc127d8fb2582a2873adc1bef0492d\"},\"headline\":\"Welding of Common Chinese Structural Steels: Q235 (GB\\\/T 700) vs Q345 (GB\\\/T 1591) \u2013 Complete Practical Guide with International Equivalents (ASTM, EN, JIS)\",\"datePublished\":\"2025-12-12T02:41:44+00:00\",\"dateModified\":\"2025-12-12T02:42:14+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/knowledge\\\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\\\/\"},\"wordCount\":513,\"publisher\":{\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/knowledge\\\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.zmdetech.com\\\/wp-content\\\/uploads\\\/Q-235-welding.webp\",\"keywords\":[\"ASTM\",\"Carbon Steel\",\"CHE507\",\"CHE577\",\"E7018\",\"E8018\",\"FCAW\",\"GMAW\",\"Hight Heat\",\"J422\",\"J426\",\"JIS\",\"Low Heat\",\"Low-hydrogen\",\"MIG\",\"PEB\",\"Pre Engineered Building\",\"Pre Fabricated Building\",\"Q235\",\"Q345\",\"S235\",\"S355\",\"SAW\",\"SM490A\",\"SMAW\",\"SS400\",\"Steel Plate\",\"Structure Steel\",\"welding\"],\"articleSection\":[\"Knowledge\"],\"inLanguage\":\"fr-FR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/knowledge\\\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\\\/\",\"url\":\"https:\\\/\\\/www.zmdetech.com\\\/knowledge\\\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\\\/\",\"name\":\"Welding of Common Chinese Structural Steels: Q235 (GB\\\/T 700) vs Q345 (GB\\\/T 1591) \u2013 Complete Practical Guide with International Equivalents (ASTM, EN, JIS) - ZMDE Steel Machinery\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/knowledge\\\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/knowledge\\\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.zmdetech.com\\\/wp-content\\\/uploads\\\/Q-235-welding.webp\",\"datePublished\":\"2025-12-12T02:41:44+00:00\",\"dateModified\":\"2025-12-12T02:42:14+00:00\",\"description\":\"Q235 vs Q345 welding guide: preheat, filler metals, heat input, PWHT &amp; international equivalents (ASTM A36, A572 Gr.50, EN S235JR, S355JR, JIS SS400). Complete tables for SMAW, GMAW, FCAW.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/knowledge\\\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\\\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.zmdetech.com\\\/knowledge\\\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/knowledge\\\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.zmdetech.com\\\/wp-content\\\/uploads\\\/Q-235-welding.webp\",\"contentUrl\":\"https:\\\/\\\/www.zmdetech.com\\\/wp-content\\\/uploads\\\/Q-235-welding.webp\",\"width\":600,\"height\":397},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/knowledge\\\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.zmdetech.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Welding of Common Chinese Structural Steels: Q235 (GB\\\/T 700) vs Q345 (GB\\\/T 1591) \u2013 Complete Practical Guide with International Equivalents (ASTM, EN, JIS)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/#website\",\"url\":\"https:\\\/\\\/www.zmdetech.com\\\/\",\"name\":\"ZMDE Steel Machinery\",\"description\":\"Make Buildings Manufactured in Factory\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.zmdetech.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/#organization\",\"name\":\"ZMDE Steel Machinery\",\"url\":\"https:\\\/\\\/www.zmdetech.com\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.zmdetech.com\\\/wp-content\\\/uploads\\\/websitelogo3.webp\",\"contentUrl\":\"https:\\\/\\\/www.zmdetech.com\\\/wp-content\\\/uploads\\\/websitelogo3.webp\",\"width\":200,\"height\":64,\"caption\":\"ZMDE Steel Machinery\"},\"image\":{\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/facebook.com\\\/zmdemachinery\",\"https:\\\/\\\/x.com\\\/zmdemachinery\",\"https:\\\/\\\/www.youtube.com\\\/@ZMDE-TECH\",\"https:\\\/\\\/www.linkedin.com\\\/company\\\/zmde-tech\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.zmdetech.com\\\/#\\\/schema\\\/person\\\/96fc127d8fb2582a2873adc1bef0492d\",\"name\":\"ZMDE\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/893fee33ab156b1efff8e22257b31f5307ec509bcb7192a6bd7cd62bff7f443d?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/893fee33ab156b1efff8e22257b31f5307ec509bcb7192a6bd7cd62bff7f443d?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/893fee33ab156b1efff8e22257b31f5307ec509bcb7192a6bd7cd62bff7f443d?s=96&d=mm&r=g\",\"caption\":\"ZMDE\"},\"sameAs\":[\"https:\\\/\\\/www.zmdetech.com\"],\"url\":\"https:\\\/\\\/www.zmdetech.com\\\/fr\\\/author\\\/athen_aizmde\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Soudage des aciers de construction chinois courants : Q235 (GB\/T 700) vs Q345 (GB\/T 1591) - Guide pratique complet avec \u00e9quivalents internationaux (ASTM, EN, JIS) - ZMDE Steel Machinery","description":"Guide de soudage Q235 vs Q345 : pr\u00e9chauffage, m\u00e9taux d'apport, apport de chaleur, PWHT &amp; \u00e9quivalents internationaux (ASTM A36, A572 Gr.50, EN S235JR, S355JR, JIS SS400). Tableaux complets pour SMAW, GMAW, FCAW.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.zmdetech.com\/fr\/connaissances\/soudage-des-aciers-de-construction-chinois-courants-q235-gb-t-700-vs-q345-gb-t-1591-guide-pratique-complet-avec-equivalents-internationaux-astm-en-jis\/","og_locale":"fr_FR","og_type":"article","og_title":"Welding of Common Chinese Structural Steels: Q235 (GB\/T 700) vs Q345 (GB\/T 1591) \u2013 Complete Practical Guide with International Equivalents (ASTM, EN, JIS)","og_description":"Q235 vs Q345 welding guide: preheat, filler metals, heat input, PWHT &amp; international equivalents (ASTM A36, A572 Gr.50, EN S235JR, S355JR, JIS SS400). Complete tables for SMAW, GMAW, FCAW.","og_url":"https:\/\/www.zmdetech.com\/fr\/connaissances\/soudage-des-aciers-de-construction-chinois-courants-q235-gb-t-700-vs-q345-gb-t-1591-guide-pratique-complet-avec-equivalents-internationaux-astm-en-jis\/","og_site_name":"ZMDE Steel Machinery","article_publisher":"https:\/\/facebook.com\/zmdemachinery","article_published_time":"2025-12-12T02:41:44+00:00","article_modified_time":"2025-12-12T02:42:14+00:00","og_image":[{"width":600,"height":397,"url":"https:\/\/www.zmdetech.com\/wp-content\/uploads\/Q-235-welding.webp","type":"image\/webp"}],"author":"ZMDE","twitter_card":"summary_large_image","twitter_creator":"@zmdemachinery","twitter_site":"@zmdemachinery","twitter_misc":{"\u00c9crit par":"ZMDE","Dur\u00e9e de lecture estim\u00e9e":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.zmdetech.com\/knowledge\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\/#article","isPartOf":{"@id":"https:\/\/www.zmdetech.com\/knowledge\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\/"},"author":{"name":"ZMDE","@id":"https:\/\/www.zmdetech.com\/#\/schema\/person\/96fc127d8fb2582a2873adc1bef0492d"},"headline":"Welding of Common Chinese Structural Steels: Q235 (GB\/T 700) vs Q345 (GB\/T 1591) \u2013 Complete Practical Guide with International Equivalents (ASTM, EN, JIS)","datePublished":"2025-12-12T02:41:44+00:00","dateModified":"2025-12-12T02:42:14+00:00","mainEntityOfPage":{"@id":"https:\/\/www.zmdetech.com\/knowledge\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\/"},"wordCount":513,"publisher":{"@id":"https:\/\/www.zmdetech.com\/#organization"},"image":{"@id":"https:\/\/www.zmdetech.com\/knowledge\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\/#primaryimage"},"thumbnailUrl":"https:\/\/www.zmdetech.com\/wp-content\/uploads\/Q-235-welding.webp","keywords":["ASTM","Carbon Steel","CHE507","CHE577","E7018","E8018","FCAW","GMAW","Hight Heat","J422","J426","JIS","Low Heat","Low-hydrogen","MIG","PEB","Pre Engineered Building","Pre Fabricated Building","Q235","Q345","S235","S355","SAW","SM490A","SMAW","SS400","Steel Plate","Structure Steel","welding"],"articleSection":["Knowledge"],"inLanguage":"fr-FR"},{"@type":"WebPage","@id":"https:\/\/www.zmdetech.com\/knowledge\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\/","url":"https:\/\/www.zmdetech.com\/knowledge\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\/","name":"Soudage des aciers de construction chinois courants : Q235 (GB\/T 700) vs Q345 (GB\/T 1591) - Guide pratique complet avec \u00e9quivalents internationaux (ASTM, EN, JIS) - ZMDE Steel Machinery","isPartOf":{"@id":"https:\/\/www.zmdetech.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.zmdetech.com\/knowledge\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\/#primaryimage"},"image":{"@id":"https:\/\/www.zmdetech.com\/knowledge\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\/#primaryimage"},"thumbnailUrl":"https:\/\/www.zmdetech.com\/wp-content\/uploads\/Q-235-welding.webp","datePublished":"2025-12-12T02:41:44+00:00","dateModified":"2025-12-12T02:42:14+00:00","description":"Guide de soudage Q235 vs Q345 : pr\u00e9chauffage, m\u00e9taux d'apport, apport de chaleur, PWHT &amp; \u00e9quivalents internationaux (ASTM A36, A572 Gr.50, EN S235JR, S355JR, JIS SS400). Tableaux complets pour SMAW, GMAW, FCAW.","breadcrumb":{"@id":"https:\/\/www.zmdetech.com\/knowledge\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\/#breadcrumb"},"inLanguage":"fr-FR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.zmdetech.com\/knowledge\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\/"]}]},{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/www.zmdetech.com\/knowledge\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\/#primaryimage","url":"https:\/\/www.zmdetech.com\/wp-content\/uploads\/Q-235-welding.webp","contentUrl":"https:\/\/www.zmdetech.com\/wp-content\/uploads\/Q-235-welding.webp","width":600,"height":397},{"@type":"BreadcrumbList","@id":"https:\/\/www.zmdetech.com\/knowledge\/welding-of-common-chinese-structural-steels-q235-gb-t-700-vs-q345-gb-t-1591-complete-practical-guide-with-international-equivalents-astm-en-jis\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.zmdetech.com\/"},{"@type":"ListItem","position":2,"name":"Welding of Common Chinese Structural Steels: Q235 (GB\/T 700) vs Q345 (GB\/T 1591) \u2013 Complete Practical Guide with International Equivalents (ASTM, EN, JIS)"}]},{"@type":"WebSite","@id":"https:\/\/www.zmdetech.com\/#website","url":"https:\/\/www.zmdetech.com\/","name":"ZMDE Steel Machinery","description":"Construire des b\u00e2timents fabriqu\u00e9s en usine","publisher":{"@id":"https:\/\/www.zmdetech.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.zmdetech.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"fr-FR"},{"@type":"Organization","@id":"https:\/\/www.zmdetech.com\/#organization","name":"ZMDE Steel Machinery","url":"https:\/\/www.zmdetech.com\/","logo":{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/www.zmdetech.com\/#\/schema\/logo\/image\/","url":"https:\/\/www.zmdetech.com\/wp-content\/uploads\/websitelogo3.webp","contentUrl":"https:\/\/www.zmdetech.com\/wp-content\/uploads\/websitelogo3.webp","width":200,"height":64,"caption":"ZMDE Steel Machinery"},"image":{"@id":"https:\/\/www.zmdetech.com\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/facebook.com\/zmdemachinery","https:\/\/x.com\/zmdemachinery","https:\/\/www.youtube.com\/@ZMDE-TECH","https:\/\/www.linkedin.com\/company\/zmde-tech"]},{"@type":"Person","@id":"https:\/\/www.zmdetech.com\/#\/schema\/person\/96fc127d8fb2582a2873adc1bef0492d","name":"ZMDE","image":{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/secure.gravatar.com\/avatar\/893fee33ab156b1efff8e22257b31f5307ec509bcb7192a6bd7cd62bff7f443d?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/893fee33ab156b1efff8e22257b31f5307ec509bcb7192a6bd7cd62bff7f443d?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/893fee33ab156b1efff8e22257b31f5307ec509bcb7192a6bd7cd62bff7f443d?s=96&d=mm&r=g","caption":"ZMDE"},"sameAs":["https:\/\/www.zmdetech.com"],"url":"https:\/\/www.zmdetech.com\/fr\/author\/athen_aizmde\/"}]}},"_links":{"self":[{"href":"https:\/\/www.zmdetech.com\/fr\/wp-json\/wp\/v2\/posts\/18853","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.zmdetech.com\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zmdetech.com\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zmdetech.com\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zmdetech.com\/fr\/wp-json\/wp\/v2\/comments?post=18853"}],"version-history":[{"count":1,"href":"https:\/\/www.zmdetech.com\/fr\/wp-json\/wp\/v2\/posts\/18853\/revisions"}],"predecessor-version":[{"id":18857,"href":"https:\/\/www.zmdetech.com\/fr\/wp-json\/wp\/v2\/posts\/18853\/revisions\/18857"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.zmdetech.com\/fr\/wp-json\/wp\/v2\/media\/18856"}],"wp:attachment":[{"href":"https:\/\/www.zmdetech.com\/fr\/wp-json\/wp\/v2\/media?parent=18853"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zmdetech.com\/fr\/wp-json\/wp\/v2\/categories?post=18853"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zmdetech.com\/fr\/wp-json\/wp\/v2\/tags?post=18853"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}