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Jiangsu Jiuming Special Steel Co., Ltd
38CrA round steel
NegotiableUpdate on 05/06
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Overview
38CrA round steel is a medium carbon chromium alloy structural steel (quenched and tempered steel) in the Chinese/navigation mark system, mainly used for high-strength fasteners and structural components in aviation and other special fields. $r $n Core Characteristics $r $n Type: High quality alloy structural steel (high-grade high-quality steel, 'A' represents advanced) $r $n Strength: High strength and toughness after quenching and tempering, excellent comprehensive mechanical properties $r $n Process: Good machinability; But the hardenability is average, and the cold plasticity and weldability are poor. Application: aviation bolts, shafts, sleeves and other low load key parts
Product Details
38CrA round steel
Comparison of Composition and Properties between 38CrA and Other Steel Grades
38CrA is a Chinese medium carbon chromium alloy structural steel (high-grade and high-quality), mainly used for quenched and tempered parts in aviation and other fields. The global corresponding grades are as follows:
1、 Core corresponding brand (global standard)
standard system |
Corresponding brand |
remark |
China GB/GJB |
38CrA |
Main card number, commonly used |
American SAE/AISI |
5140 |
接近等同 |
Japanese JIS |
SCr440 (SCr440H) |
equivalent |
German DIN/[W.Nr] (W.Nr) |
37Cr4 (1.7034) |
Approximately equivalent |
British BS |
530A40 |
equivalent |
French NF |
38C4 |
equivalent |
Former Soviet Union |
38XA / 40X |
approximate |
International ISO |
38Cr2 |
approximate |
2、 Briefly explain
38CrA = 5140 = SCr440 = 37Cr4 (1.7034)
Material type: Medium carbon quenched and tempered alloy structural steel
Key components: C ≈ 0.38%, Cr ≈ 0.90%
Core characteristics: Good comprehensive mechanical properties, good low-temperature toughness, excellent machinability, but average hardenability
Typical applications: aviation bolts, shafts, sleeves, connectors, and other low to medium load quenched and tempered parts
III38CrA round steelEasy to confuse and distinguish
38CrA ≠ 38CrMoAl: The former is structural steel, while the latter is nitriding steel, with different compositions and uses.
38CrA ≠ ML38CrA: ML38CrA is a cold heading steel specially optimized for cold heading process.
4、 Mechanical properties (quenched and tempered state)
Tensile strength (σ b): ≥ 980 MPa
Yield strength (σ s): ≥ 835 MPa
Elongation rate (δ 5): ≥ 12%
Shrinkage rate of cross-section (ψ): ≥ 45%
Impact energy (Aku): ≥ 63 J
Annealing hardness: 156~229 HBW
4、 Standard heat treatment
Quenching: 860 ° C ± 10 ° C, oil cooled
回火： 500~590°C， 油 / 水冷
5、 Corresponding domestic and international brands
China: 38CrA (GJB)
USA: SAE 5140
Soviet Union: 38XA
UK: 530A40
France: 38C4
6、 Typical applications
Aerospace: High strength bolts, nuts, and dowels for aircraft and engines
Machinery: shafts, gears, and connecting rods that require high strength and toughness
