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Japan Sacm 645 JIS G4202

Home Research center Japan Sacm 645 JIS G4202...
Japan Datong, The SACM645 of alloy structural steel 

Product Description: SACM645 (JIS G4202) 

 Performance and application:

Has a high permeation performance and mechanical properties, excellent heat resistance and corrosion resistance, high fatigue strength and good heat resistance, non-temper embrittlement, Passable workability, low plasticity when cold deformation, welding poor hardenability low, generally in the quenched and tempered and infiltration helium.

Uses:

For manufacturing high fatigue strength, high abrasion resistance, the exact size after heat treatment, high strength, a variety of sizes small seepage helium Parts.

Chemical composition:

Carbon C: 0.35 ~ 0.42

Silicon Si: 0.20 ~ 0.45

Manganese Mn: 0.30 ~ 0.60

Sulfur S: allow the residual content ≤ 0.035

Phosphorus P: allow the residual content ≤ 0.035

Chromium Cr: 1.35 ~ 1.65

Ni: to allow the residual content ≤ 0.030

Cu: to allow the residual content ≤ 0.030

Molybdenum Mo: 0.15 ~ 0.25

Mechanical properties:

Tensile strength σb (MPa): ≥ 980 (100)

Yield strength σs (MPa): ≥ 835 (85)

Elongation δ5 (%): ≥ 14

Reduction of area ψ (%): ≥ 50

Impact energy Akv (J): ≥ 71

Impact toughness value of alpha kv (J/cm2): ≥ 88 (9)

Hardness: ≤ 229HB

Sample size: Sample blank dimensions of 30mm
 

Heat treatment process:

Heat Treatment Specification: quenching 940 ℃, water, oil cooling; tempering 640 ° C, water-cooled, oil-cooled.

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