4Cr13 (40Cr13) Stainless Steel Datasheet, Properties

4Cr13 Stainless Steel Introduction

4Cr13 steel (New name: 40Cr13) is a martensitic type stainless steel, which has higher hardness than 3Cr13 steel after quenching. The steel has good mechanical processing performance. After heat treatment (quenching and tempering), it has good corrosion resistance, polishing performance, high strength and wear resistance.

4Cr13 Steel Datasheet and Specification

The following tables list the 4Cr13 steel datasheets such as chemical composition and mechanical properties, etc.

Chemical Composition

4Cr13 Chemical Composition (%)
Steel Grade C Si (≤) Mn (≤) P (≤) S (≤) Cr Ni (≤)
4Cr13 (40Cr13) 0.36-0.45 0.60 0.80 0.040 0.030 12.00-14.00 0.60

Mechanical Properties for Steel Bars

  • HRC hardness: ≥ 50 (Quenched and Tempered)
  • HBW hardness: ≤ 235 (Annealed)

Notes: For diameter or thickness ≤ 75 mm.

Physical Properties

  • Density (g/cm3): 7.75
  • Specific heat capacity (J/Kg·K): 460 at 0-100℃
  • Thermal conductivity (W/m·K):
    • 28.1 at 100℃
    • 28.9 at 500℃
  • Coefficients of linear thermal expansion (10-6/K):
    • 10.5 (0-100℃)
    • 12.0 (0-500℃)
  • Electrical Resistivity (μΩ·m): 0.59 at 20℃
  • Longitudinal modulus of elasticity (kN/mm2): 215 at 20℃

Typical Heat Treatment

  • Annealing: 800 – 900 ℃ (Slow cooling)
  • Quenching: 1050 – 1100 ℃ (Oil cooling)
  • Tempering: 200 – 300 ℃ (Air cooling)


Oil quenching cold work die steel has some crack sensitivity. It should not be heated quickly when forging heating. It’s better to preheat at 650-750 °C. The forging heating temperature is 1130-1150 °C, and the final forging temperature should be greater than 800-850 °C. The upper limit temperature is taken when the ingot is forged, and the lower limit temperature is taken when the billet is forged.


Stainless steel 4Cr13 is suitable for manufacturing plastic molds, transparent plastic products moulds, etc. which are subjected to high load, high wear resistance and corrosive medium. Also used in the manufacture of hot oil pumps, tools, valve seats, valves, nozzles, measuring tools, medical equipment, springs, etc.

(40Cr13) 4Cr13 Steel Equivalent

40Cr13 (4Cr13 stainless steel) equivalent to US ASTM AISI, European (Germany DIN, UK BSI, France NF), Japanese JIS, and ISO standard.

China European ISO
Standard Grade Standard Grade (Steel number) Standard Steel Name (ISO Number)
GB/T 1220;
GB/T 3280
4Cr13 (40Cr13) EN 10088-3 X39Cr13 (1.4031) ISO 15510 X39Cr13 (4031-420-00-I)

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