Seamless steel pipe library: What material does American standard AISI4340 correspond to in China
Hit：112026-07-24 14:26:41
Seamless steel pipe library: What material does American standard AISI4340 correspond to in China
4340 corresponds to the domestic material 40CrNiMoA, and some materials are also labeled as 40CrNi2MoA. This is a comparison between common grades of AISI/SAE standard alloy structural steel in the United States and Chinese GB standards.
Brand comparison basis
Authoritative source confirmation: Baidu Baike clearly indicates AISI4340, also known as 40CrNiMoA, in accordance with the standard GB/T 3077.
Chemical composition matching: 4340 contains 0.38% -0.43% carbon, 1.65% -2.00% nickel, 0.70% -0.90% chromium, 0.20% -0.30% molybdenum, which is similar to the composition range of 40CrNiMoA.
Industry standard comparison: Multiple special steel suppliers and overseas sites have listed 4340 and 40CrNiMoA as equivalent materials.
Other common reference grades
40CrNi2MoA: Some data suggests that the nickel content is closer to the original standard of 4340.
International equivalent grades: Germany 36CrNiMo4, Japan SNCM439, France 40NCD3, UK 816M40.
Typical application scenarios
Used for manufacturing heavy-duty machinery shafts, aviation engine turbine shafts, gears, helicopter rotor shafts, and other high load quenched and tempered parts, requiring good toughness, high strength, and large section hardenability.
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