1.4125 Stainless Steel
1.4125 is a high-carbon, high-chromium martensitic stainless steel. The addition of molybdenum improves its overall properties. This material features high hardness (58–62 HRC), excellent wear resistance, corrosion resistance and high-temperature dimensional stability.
Available Form
Round Bar
Custom Diameter & Length
Flat Bar
Custom Thickness, Width & Length
Square Bar
Custom Width & Length
Steel Plate
Custom Thickness, Width & Length
Steel Grade Comparison(wt%)
| W-Nr | EN | AISI | JIS |
| 1.4125 | X105CrMo17 | 440C | – |
Chemical Composition
| C | Si | Mn | P | S | Cr | Mo |
| 0.95~1.20 | ≤1.00 | ≤1.00 | ≤0.040 | ≤0.030 | 16.00~18.00 | 0.40~0.80 |
Physical Properties
Density（g/cm3)：7.67
Modulus of Elasticity（Gpa): 200
Thermal Conductivity（W/（m.k)): 24.2
| Temperature/℃ | 20-100 | 2-200 | 2-300 | 2-400 |
| Coefficient of Thermal Expansion（×10-6） | 9.8 | 10.8 | 11.4 | 11.7 |
Heat Treatment Process
Hardening: Heat the steel evenly to 1040~1080°C until the whole section reaches temperature. Then quench in oil to cool.
Annealing: Heat the steel to 840~870°C, hold it well at temperature, and then let it cool slowly inside the furnace.
Tempering: Low-temperature tempering at 150–250°C for 2–3 cycles, hardness up to 58–62 HRC.
Application Fields
Common applications: ball bearings and races, moulds, cutlery, valve components, knives, measuring instruments and other products requiring maximum hardness and wear resistance.
Disclaimer: the information and data presented herein are typical values for reference and are not intended as warranties to readers.
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