Details:

Alloy structural steel: 12CrNi3A

Standard: GB/T 3077- 1988

● Features and scope of use:

It is a kind of high-grade carburized steel with wide applications. Compared with 15Cr and 20Cr steels, it has higher strength, plasticity and hardenability. It is mainly used to manufacture spindles with high strength, hardness and toughness under heavy load, shafts and rods with high center toughness or bearing impact load, wear-resistant surface and small heat treatment deformation, as well as various transmission gears, adjusting screws and camshafts working under high speed and impact load.

Chemical composition:

Carbon? C :0. 10~0. 17

Silicon? Si:0. 17~0.37

Manganese? Manganese: 0.30-0.60

Sulfur? S: allowable residue ≤0.035.

Phosphorus? P: allowable residue ≤0.035.

Chromium? Chromium: 0.60-0.90

Nickel? Ni: 2.75~3. 15

Copper? Copper: allowable residual content ≤0.030.

● Mechanical properties:

Tensile strength? σb (MPa): ≥930(95)

Yield strength? σs (MPa):≥685(70)

Elongation? δ5 (%):≥ 1 1

Area shrinkage? ψ (%):≥50

Impact work? Akv (J):≥7 1

Impact toughness value? αkv (J/cm2):≥88(9)

Hardness? :≤2 17HB

Sample size: the blank size of the sample is 15mm.

● Heat treatment specification and metallographic structure:

Heat treatment specification: quenching: 860℃ for the first time, 780℃ for the second time, oil cooling; Tempering at 200℃, water cooling and air cooling.

● Delivery status: The goods shall be delivered by heat treatment (normalizing, annealing or high temperature tempering) or non-heat treatment, and the delivery status shall be indicated in the contract.

12CrNi3A round steel Shanghai Lijia Special Steel Co., Ltd.