4340 Alloy Steel Heat Resistance 4340 Steel Round Bar
AISI 4340 steel, refer to corresponding steel number: GB steel number 40CrNiMoA, German DIN steel number 36CrNiMo4, German DIN material number 1.6511, French NF standard 40NCD3, Japanese JIS standard SNCM439, British BS standard 816M40, The United States AISI/ASTM 4340, German UNS standard G43400; It is high strength alloy structural steel, is in the high quality carbon structural steel on the basis of the appropriate addition of one or several alloy elements (total content is not more than 5%) and made of steel; With high strength, toughness and outstanding hardenability and anti-overheating stability, good plasticity, heat resistance, uniform material, high reliability, with weldability, no leakage, simple production of steel structure, short construction period, with good assembly.
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