{"id":69568,"date":"2026-05-17T17:26:59","date_gmt":"2026-05-17T17:26:59","guid":{"rendered":"https:\/\/evgroupchina.com\/encyclopedia-of-metal\/jis-g3124\/"},"modified":"2026-05-19T15:29:37","modified_gmt":"2026-05-19T15:29:37","slug":"jis-g3124","status":"publish","type":"wiki","link":"https:\/\/evgroupchina.com\/en\/encyclopedia-of-metal\/jis-g3124\/","title":{"rendered":"JIS G3124"},"content":{"rendered":"

Technical specifications and application area of JIS G3124<\/h2>\n

The JIS G3124 standard regulates the production of high-strength steel plates designed for the manufacture of boiler equipment and pressure vessels operating under excess pressure. A key feature of this rolled product is the strictly standardized yield strength (or 0.2% proof stress) in the temperature range from normal conditions up to 400 \u00b0C. The material possesses excellent weldability characteristics, which is critical for critical welded structures. EV Group China supplies a wide range of these steels, ensuring compliance with all industrial standard requirements.<\/p>\n

The range of nominal thicknesses for plate products is presented in the table below:<\/p>\n\n\n\n\n\n\n\n
Steel Grade<\/th>\nThickness, mm<\/th>\n<\/tr>\n<\/thead>\n
SEV 245<\/td>\nfrom 6 to 150 inclusive<\/td>\n<\/tr>\n
SEV 295<\/td>\nfrom 6 to 150 inclusive<\/td>\n<\/tr>\n
SEV 345<\/td>\nfrom 6 to 150 inclusive<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The chemical composition of the steels determines their high operational reliability and processability during heat treatment:<\/p>\n\n\n\n\n\n\n\n
Steel<\/th>\nC<\/th>\nSi<\/th>\nMn<\/th>\nP<\/th>\nS<\/th>\nCu<\/th>\nMo<\/th>\nNb<\/th>\nV<\/th>\n<\/tr>\n<\/thead>\n
SEV 245<\/td>\n<0.20<\/td>\n0.15-0.60<\/td>\n0.80-1.60<\/td>\n<0.030<\/td>\n<0.030<\/td>\n<0.40<\/td>\n<0.35<\/td>\n<0.05<\/td>\n0.10<\/td>\n<\/tr>\n
SEV 295<\/td>\n<0.19<\/td>\n0.15-0.60<\/td>\n0.80-1.60<\/td>\n<0.030<\/td>\n<0.030<\/td>\n<0.70<\/td>\n0.10-0.40<\/td>\n<0.05<\/td>\n0.10<\/td>\n<\/tr>\n
SEV 345<\/td>\n<0.19<\/td>\n0.15-0.60<\/td>\n0.80-1.60<\/td>\n<0.030<\/td>\n<0.030<\/td>\n<0.70<\/td>\n0.15-0.50<\/td>\n<0.05<\/td>\n0.10<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Mechanical properties and strength parameters<\/h2>\n

EV Group China products undergo strict quality control, ensuring that mechanical characteristics meet the requirements of the JIS G3124 standard to ensure the safety of pressure vessel operations.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Steel<\/th>\nThickness, mm<\/th>\nYield Strength, N\/mm2, min.<\/th>\nTensile Strength, N\/mm2<\/th>\nElongation, %, min.<\/th>\n<\/tr>\n<\/thead>\n
SEV 245<\/td>\nup to 50 inclusive<\/td>\n370<\/td>\n510-650<\/td>\n16<\/td>\n<\/tr>\n
from 50 to 100 inclusive<\/td>\n355<\/td>\n510-650<\/td>\n20<\/td>\n<\/tr>\n
from 100 to 125 inclusive<\/td>\n345<\/td>\n500-640<\/td>\n20<\/td>\n<\/tr>\n
from 125 to 150 inclusive<\/td>\n335<\/td>\n490-630<\/td>\n20<\/td>\n<\/tr>\n
SEV 295<\/td>\nup to 50 inclusive<\/td>\n420<\/td>\n540-690<\/td>\n15<\/td>\n<\/tr>\n
from 50 to 100 inclusive<\/td>\n400<\/td>\n540-690<\/td>\n19<\/td>\n<\/tr>\n
from 100 to 125 inclusive<\/td>\n390<\/td>\n530-680<\/td>\n19<\/td>\n<\/tr>\n
from 125 to 150 inclusive<\/td>\n380<\/td>\n520-670<\/td>\n19<\/td>\n<\/tr>\n
SEV 345<\/td>\nup to 50 inclusive<\/td>\n430<\/td>\n590-740<\/td>\n14<\/td>\n<\/tr>\n
from 50 to 100 inclusive<\/td>\n430<\/td>\n590-740<\/td>\n18<\/td>\n<\/tr>\n
from 100 to 125 inclusive<\/td>\n420<\/td>\n580-730<\/td>\n18<\/td>\n<\/tr>\n
from 125 to 150 inclusive<\/td>\n410<\/td>\n570-720<\/td>\n18<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":0,"template":"","meta":[],"wiki_category":[118],"class_list":["post-69568","wiki","type-wiki","status-publish","hentry","wiki_category-jis"],"_links":{"self":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69568","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69568\/revisions"}],"wp:attachment":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/media?parent=69568"}],"wp:term":[{"taxonomy":"wiki_category","embeddable":true,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki_category?post=69568"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}