Introduction to AISI4140 alloy structural steel

Introduction to AISI4140 alloy structural steel

AISI4140 alloy structural steel is close to the domestic 42CrMo alloy steel plate. It has high strength and high toughness. At the same time, the hardenability is also relatively good. It can be produced by Wuyang Iron and Steel Co., Ltd., and the dance skill standard is implemented. At the same time, the AISI4140 alloy structural steel plate is suitable for the manufacture AISI4140 of alloy structural steel in large and medium-sized plastic molds
with high strength and toughness, and the implementation standard: ASTM A29/A29M-04, medium hardenable steel, has good strength and good mechanical properties after heat treatment, good manufacturability, and high yield rate.
AISI4140 alloy structural steel corresponds to domestic and foreign grades, corresponding to international standards organization grades: 42CrMo4 corresponds to Japanese grades: SCM440 corresponds to German grades: 42CrMo4

corresponds to American grades: 4140 corresponds
to British BS 708M40

/708A42/ 709M40

 

Chemical composition

Tabulation: Depu Steel Date: 2024-01-18

C	Si	Mn	P	S	Cr	Ni	Mo	Cu
0.38-0.45	0.17~0.37	0.50~0.80	≤0.035	≤0.035	0.9~1.20	≤0.30	0.15~0.25	≤0.30

GB/T222 AISI4140 mechanical properties
of alloy structural steel, tensile strength σb (MPa): ≥1080 (110),
yield strength σs (MPa): ≥930 (95).
Elongation δ5 (%): ≥12 section shrinkage ψ (%): ≥45
impact energy Akv (J): ≥63
impact toughness value αkv (J/cm2
): ≥78 (8)
Hardness: ≤217HB
The use temperature of AISI4140 alloy structural steel is 427 degrees Celsius.4140 strength, high hardenability, good toughness, small deformation during quenching, high creep strength and lasting strength at high temperature. It is used to manufacture forgings that require higher strength and quenched and tempered cross-section than 35CrMo steel, such as large gears for locomotive traction, supercharger transmission gears, rear axles, connecting rods and spring clamps with great load, and can also be used for oil deep well drill pipe joints and fishing tools below 2000m, and can be used for molds of bending machines