3Cr13 Stainless Steel Bar

3Cr13 Steel Introduction

Chinese 30Cr13 (3Cr13 steel) is a martensitic stainless steel, this steel has good mechanical processing performance. After heat treatment (quenching and tempering), it has excellent corrosion resistance and high polishing strength and wear resistance. After quenching and tempering treatment, when hardness is below HRC30, 3Cr13 material has good processability and easy to achieve good surface quality, and when the hardness is greater than HRC30, the surface quality is good, but the tool is easy to wear.

Compared with 1Cr13 (12Cr13) and 2Cr13 steel, 3Cr13 stainless steel has higher strength, hardness and higher hardenability. It has certain corrosion resistance in dilute nitric acid and weak organic acid at room temperature, but not as good as 1Cr13 and 2Cr13.

30Cr13 = 3Cr13 stainless steel grade designation:

30 (or 3) – Average carbon content: 30/10000 (0.3%), old designation: 3/1000

Cr – Chromium

13 – Average chromium content: 13%

(30Cr13) 3Cr13 Stainless Steel Chemical Composition

Mechanical Properties

For Hot Rolled Steel Bars after Quenching and Tempering

Tensile strength: ≥735 N/mm2

Conditional yield strength: ≥540 N/mm2

Elongation: ≥12%

Rate of reduction in area: ≥40%

Impact energy: ≥24 J

Hardness:

HBW: ≤ 217(Quenched and tempered); ≤ 235 (Annealed)

HV: ≤ 247 (After annealing)

HRC: 48-53 (Quenching and tempering)

Notes:

Data is for steel diameter (d) less than or equal to 75mm.

1 N/mm2 = 1 MPa

For Cold Rolled Steel Plate and Strip After Annealling

0.2% Proof Strength: ≥225 MPa

Tensile Strength: 540 MPa

Elongation: ≥18%

Hardness:

HBW: ≤ 235

HRB: ≤ 99

HV: ≤ 247

Physical Properties

Density (g/cm3): 7.76

Melting point: 1365℃

Specific heat capacity (J/Kg·K): 170 at 0-100℃

Thermal conductivity (W/m·K):

25.1 at 100℃

25.5 at 500℃

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

10.5 (0-100℃)

12.0 (0-500℃)

Electrical Resistivity (μΩ·m): 0.52 at 20℃

Longitudinal modulus of elasticity (kN/mm2): 219 at 20℃

Typical Heat Treatment

For steel bars

Annealing: 800 – 900 ℃ (Slow cooling)

Quenching: 920 – 980 ℃ (Oil cooling)

Tempering: 600 – 750 ℃ (Rapid cooling)

For steel plate and strip

Annealing: About 750℃ (rapid cooling) or 800 – 900℃ (slow cooling)

Quenching: 980 – 1040℃ (rapid cooling)

Tempering: 150 – 400 ℃ (Air cooling)

Applications

3Cr13 steel is mainly used for high-strength parts, as well as wear parts under high stress load and certain corrosive medium, such as tools and springs working below 300 °C; shafts, bolts, nozzles, valves, valve seats and bearings working below 400 °C.

(30Cr13) 3Cr13 Steel Equivalent

30Cr13 (3Cr13 stainless steel) equivalent to US ASTM, Germany DIN, Japanese JIS, France NF, UK BS, and ISO standard.

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