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18Cr2Ni4W

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18Cr2Ni4W belongs to high strength medium alloy carburizing steel. To ensure that the content of C compounds and austenite does not exceed the standard, high temperature tempering at 900 ~ 920 ° C after carburizing, 600 ~ 650 tempering, cryogenic treatment, and hardness after oil quenching is about 48. Want to reach HRC58- 63, surface carburization must be performed.

Standards: GB / T 3077-1988

Chemical Composition %

C	Si	Mn	S	P	Cr	Ni	Cu	W
0.13 - 0.19	0.17 - 0.37	0.30 - 0.60	max 0.025	max 0.025	1.35 - 1.65	4.00 - 4.50	Max 0.025	0.80 - 1.20

Mechanical properties

Tensile strength σb (MPa)	≥1175(120)
Yield strength σs (MPa)	≥835(85)
Elongation δ5 (%)	≥10
Section shrinkage rate ψ (%)	≥45
Impact work Akv (J)	≥78
Impact toughness value αkv (J / cm2)	≥98(10)
Hardness (HB)	≤269

In what applications is 18Cr2Ni4W used?

18Cr2Ni4W steel commonly used alloy carburizing steel, high strength, toughness, good hardenability, can also be used without carburizing and quenching and tempering, generally used for larger sections, higher load and good toughness, low notch sensitivity Important parts.

Heat treatment specifications

Quenching: 950 ℃ for the first time, 850 ℃ for the second time, air cooling; 200 ℃ for tempering, water cooling and air cooling.

Delivery status

Delivery in the heat treatment (normalizing, annealing or high temperature tempering) or non-heat treatment status, the delivery status should be specified in the contract.