9CR18 Hardware Tool Steel Bar

9Cr18 steel is a high-carbon high-chromium martensitic stainless steel, after quenching with high hardness, high wear resistance and corrosion resistance. The steel is suitable for the manufacture of plastic molds that withstand high wear, high loads and corrosive media. The steel belongs to Lai Steel's body, easy to form uneven carbide segregation and affect the service life of the mold, so the thermal processing must be strictly controlled thermal processing, pay attention to the appropriate processing ratio

9Cr18 is a high-carbon high chromium martensitic stainless steel, which has improved corrosion resistance compared to Cr17 steel, and other properties are similar to those of Cr17.

9Cr18 stainless steel mainly used in the manufacture of corrosion resistant high strength wear resistant components such as shafts, pumps, valve parts, rods, springs, fasteners, etc. Due to the extremely easy formation of non-uniform carbides in the steel, which affects the quality and performance of the steel, attention should be paid to the production.

Chemical Composition:

Mechanical Properties:

• Material HRC Hardness: ≥ 55 (Quenching and tempering);
• Material HBW Hardness: ≤ 255 (Annealing)

• Density (g/cm3): 7.70
• Melting point: 1377-1510
• Specific heat capacity (J/Kg·K): 480 at 0-100℃
• Thermal conductivity (W/m·K): 29.3 at 100℃
• Coefficients of linear thermal expansion (10^-6/K):
  • 10.5 (0-100℃)
  • 12.0 (0-500℃)
• Electrical Resistivity (μΩ·m): 0.60 at 20℃
• Longitudinal modulus of elasticity (kN/mm2): 200 at 20℃.
• Magnetic: Yes

Heat Treatment Specification:

• Annealing: 800 – 920 ℃ (Slow cooling)
• Quenching: 1000 – 1050 ℃ (Oil cooling)
• Tempering: 200 – 300 ℃ (Oil or air cooling)

Equivalent Grade:

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