chemical composition
Carbon C: 0.95~1.05 Silicon Si: ≤0.50
Manganese Mn:≤1.00
Sulfur S :≤0.030
Phosphorus P:≤0.030
Chromium Cr:4.75~5.50
Nickel Ni: allowable residual content ≤ 0.25
Copper Cu: allowable residual content ≤ 0.30
Vanadium V: 0.15~0.50
Molybdenum Mo:0.90~1.40
Folding mechanical properties
Hardness: Annealed, ≤255HB, indentation diameter ≥3.95mm; Quenching, ≥60HRC
Heat treatment specification and metallographic structure
Heat treatment specification: quenching, preheating at 790±15℃, heating at 940±6℃ (salt bath) or 950±6℃ (furnace controlled atmosphere), holding for 5~15min, air cooling, tempering at 200±6℃
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