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Qilute Steel specializes in the production of high-tech, high value-added precision forging specialQilute Steel specializes i...

Qilute Steel Co., Ltd. specializes in the production of large-caliber thick-wall...

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Phone: 0537-3125088
Fax: 0537-3120088
Mobile: 13345188345
Email: qltgyxgs@163.com
Website: http://m.xyqm01.cn
Address: 29 Longqiao North Road, Yanzhou, Jining City, Shandong Province

 

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Alloy structural steel: 4340 (40crni2moa)
U.S. brand numbers: SAE4340, AISI4340 
Implementation standard: ASTM A29/A29M-04
Chemical composition:
Carbon C: 0.38-0.43
Si: 0.15-0.35
Mn: 0.60-0.90
Sulfur S: Allowable Residual Content ≤ 0.040
Phosphorus p: allowable residual content ≤ 0.035
Cr: 0.60-0.90
Ni: 1.65 ~ 2.00
Cu: Allowable Residual Content ≤ 0.025
Mo: 0.20-0.30
Mechanical properties:
Tensile strength σ b (MPa): ≥ 980 (100)
Yield strength σ s (MPa): ≥ 835 (85)
Elongation Δ 5 (%): ≥ 12
Section shrinkage Ψ (%): ≥ 55
Akv (j) of impact power: ≥ 78
Impact toughness value α kv (j/cm2): ≥ 98 (10)
Hardness: ≤ 269hb
Sample size: the sample blank size is 25 mm.
Heat Treatment Specification and Metallographic Structure;
Heat treatment specification: quenching 850℃, oil cooling; Tempering 600℃, water cooling, oil cooling.  
Delivery status: delivery in heat treatment (normalizing, high temperature tempering) or annealing status

4340

 
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