2024/07/11

95Cr18, 9Cr18 Stainless Steel Material Table Description

1. 95Cr18 (9Cr18 Steel)

Description

9Cr18 steel is a high-carbon, high-chromium martensitic stainless steel known for its high hardness, high wear resistance, and corrosion resistance after quenching. This steel is ideal for manufacturing plastic molds that must endure high wear, heavy loads, and corrosive environments. However, due to the steel's tendency to form uneven carbide segregation, which can impact the mold's service life, thermal processing must be strictly controlled, and appropriate processing ratios should be maintained.

Compared to Cr17 steel, 9Cr18 offers improved corrosion resistance while maintaining similar properties. It is primarily used in the manufacture of high-strength, wear-resistant components such as shafts, pumps, valve parts, rods, springs, and fasteners. Special attention should be given to production to prevent the formation of non-uniform carbides, which can affect the quality and performance of the steel.

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2. Chemical Composition

9Cr18 stainless steel is a high-carbon, high-chromium martensitic stainless steel known for its excellent hardness, wear resistance, and corrosion resistance. It is widely used in various high-demand industrial applications. Here is a detailed introduction to 9Cr18 stainless steel.

	9Cr18 Chemical Composition %
Steel Grade	C	Si (≤)	Mn (≤)	P (≤)	S (≤)	Cr	Ni (≤)
9Cr18 (95Cr18)	0.90-1.00	0.80	0.80	0.040	0.030	17.00-19.00	(0.60)

(1) Physical, and Mechanical Properties:

Material HRC Hardness: ≥ 55 (Quenching and tempering);
Material HBW Hardness: ≤ 255 (Annealing)
Density (g/cm3): 7.70
Melting point: 1377-1510
Specific heat capacity (J/Kg·K): 480 at 0-100℃
Thermal conductivity (W/m·K): 29.3 at 100℃
Coefficients of linear thermal expansion (10-6/K):
- 10.5 (0-100℃)
- 12.0 (0-500℃)
Electrical Resistivity (μΩ·m): 0.60 at 20℃
Longitudinal modulus of elasticity (kN/mm2): 200 at 20℃.
Magnetic: Yes

(2) Heat Treatment Specification：

Annealing: 800 – 920 ℃ (Slow cooling)
Quenching: 1000 – 1050 ℃ (Oil cooling)
Tempering: 200 – 300 ℃ (Oil or air cooling)

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3. Equivalent Grade

9Cr18 steel (also known as 95Cr18) is equivalent to various international standards. For reference, here are its equivalents in different systems:

Equivalent
China		USA		Germany		Japan		France		UK
Standard	Grade	Standard	Grade	Standard	Grade	Standard	Grade	Standard	Grade	Standard	Grade
GB/T 1220	9Cr18 (95Cr18)	AISI, ASTM A276/A276M	440C	DIN EN 10088-3; DIN 1.7440, DIN 1.7222	X105CrMo17 (1.4125)	JIS G4303	SUS 440C	NF A35-572, NF A35-576-582, NF A35-584	Z100CD17	EN 10088-3	X105CrMo17 (1.4125)

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