9Cr18Mo steel is China GB standard martensitic stainless steel. Equals 102Cr17Mo. After quenching, it has high hardness and wear resistance and high dimensional stability. The properties and uses of 9Cr18Mo are basically the same as those of 9Cr18 steel. But after quenching, it has higher hardness and anti-tempering stability. Molybdenum can increase the passivation effect of stainless steel.

9Cr18Mo steel

9Cr18Mo Worldwide Equivalents

Grade102Cr17Mo/ 9Cr18MoX105CrMo17 (1.4125)X105CrMo17 (1.4125)SUS 440CX108CrMo17440C

9Cr18Mo 102Cr17Mo Steel Chemical Composition

CSi (≤)Mn (≤)P (≤)S (≤)Ni (≤)CrMo

9Cr18Mo 102Cr17Mo Steel Mechanical Properties

  • Material Rockwell hardness: ≥55 HRC (Quenching and tempering)
  • Material Brinell hardness: ≤269 HBW (steel bar after annealing)

9Cr18Mo 102Cr17Mo Steel Physical Properties

  • Density (g/cm3): 7.70
  • Specific heat capacity (J/Kg·K): 430 at 0-100℃
  • Thermal conductivity (W/m·K): 16.0 at 100℃
  • Electrical Resistivity (μΩ·m): 0.80 at 20℃
  • Longitudinal modulus of elasticity (kN/mm2): 215 at 20℃

Coefficients of linear thermal expansion

Coefficients of linear thermal expansion (10-6/K)10.411.6

Heat Treatment

  • 1、Annealing temperature of steel bars: 800-900℃ (Slow cooling)
  • 2、Quenching temperature: 1000-1050℃ (Oil cooling)
  • 3、Tempering temperature: 200-300℃ (Air cooling or Oil cooling)

102Cr17Mo Steel Application

1. 102Cr17Mo high carbon chromium stainless steel Application: Suitable for manufacturing bearings in seawater, river water, nitric acid, steam, marine. Such as bearings in ships, submersible pump components, bearings in petroleum and chemical machinery, marine instrument bearings.

2. 102Cr17Mo steel is suitable for good corrosion resistance (magnetic) tableware (knife), turbine blades. After quenching, the hardness is higher than that of 440A steel (magnetic). Such as blade, nozzle, valve, plate ruler, tableware (scissors) ).

102Cr17Mo Products

Product TypeProductsDimensionProcessesDelivery Status
Plates / SheetsPlates / Sheets0.08-200mm(T)*W*LForging, hot rolling, and cold rollingAnnealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Steel BarRound Bar, Flat Bar, Square BarΦ8-1200mm*LForging, hot rolling and cold rolling, CastBlack, Rough Turning, Shot Blasting,
Coil / StripSteel Coil /Steel Strip0.03-16.0x1200mmCold-Rolled & Hot-RolledAnnealed, Solution and Aging, Q+T, ACID-WASHED, Shot Blasting
Pipes / TubesSeamless Pipes/Tubes, Welded Pipes/TubesOD:6-219mm x WT:0.5-20.0mmHot extrusion, Cold Drawn, WeldedAnnealed, Solution and Aging, Q+T, ACID-WASHED