15NiCr13 (1.5752) structural steel bar

15NiCr13 (1.5752) structural steel alloy is a high-grade carburized steel with a wide application. Compared with 15Cr and 15Cr steel, 15NiCr13 has high strength, plasticity and hardenability. 15NiCr13 is mainly used to make high load under heavy load conditions. High-strength, high-hardness and high-toughness spindles and shafts with high toughness or impact load, wear-resistant surface, heat-treated deformation, rods and various transmission gears under high-speed and shock loads, adjusting screws, camshafts.

Application:

Used in the manufacture of various carburizing or carbonitriding parts with high surface hardness, good mechanical properties of the core, heavy load, impact, wear and the like. Steel for critical case hardened pieces requiring good tenacity and strength in the core (average tensile strength of 80-110 kgs/mm2 ) and/or good compressive strength. Its most common applications are for gears, pinions, reducers, speed boxes, cams, bolts and ball joints.

Chemical composition:

• Carbon C: 0.10~0.17
• Silicon Si: 0.17~0.37
• Manganese Mn: 0.30 to 0.60
• Sulfur S: Allowable residual content ≤0.035
• Phosphorus P: Allowable residual content ≤0.035
• Chromium Cr: 0.60 to 0.90
• Nickel Ni: 2.75~3.15
• Copper Cu: Allowable residual content ≤0.030

Mechanical properties:

• Tensile strength σb (MPa): ≥ 930 (95)
• Yield strength σs (MPa): ≥ 685 (70)
• Elongation δ5 (%): ≥11
• Area shrinkage ψ (%): ≥ 50
• Impact work Akv (J): ≥71
• Impact toughness value αkv (J/cm2): ≥88(9)
• Hardness: ≤217HB
• Sample size: sample blank size is 15mm

Heat treatment specifications and metallographic organization:

Heat treatment specification: quenching: first 860 ° C, second 780 ° C, oil cooling; tempering 200 ° C, water cooling, air cooling.

Delivery status:

Delivery by heat treatment (normalizing, annealing or high-temperature tempering) or no heat treatment, the delivery status should be stated in the contract.

Equivalent Steel Grade:

15NiCr13 Tempering Diagram

15NiCr13 TTT Diagram CCT Diagram

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