2024/07/11

95Cr18, 9Cr18 Stainless Steel Material Table Description

Table of Contents

1. 95Cr18 (9Cr18 Steel)

2. Chemical Composition

3. Equivalent Grade

4. Other Stainless Steel Materials

5. Stainless Steel Bearing Applications

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)

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)

4. Introduction to Characteristics of Other Stainless Steel Materials Besides 9Cr18 (440C)

(1) 304 Stainless Steel

Corrosion Resistance: Excellent corrosion resistance, capable of withstanding various chemical substances, widely used.
Mechanical Properties: Good strength and toughness, suitable for various environments.
Magnetic Properties: Austenitic stainless steel, typically non-magnetic or weakly magnetic.

(2) 316 Stainless Steel

Corrosion Resistance: Addition of molybdenum enhances corrosion resistance, especially suitable for marine and acidic environments.
Mechanical Properties: Similar to 304, with good strength and toughness.
Magnetic Properties: Similar to 304, typically non-magnetic or weakly magnetic.

(3) 420 Stainless Steel

Hardness and Wear Resistance: Higher hardness, better wear resistance than 304 but lower than 440C.
Corrosion Resistance: Slightly inferior to 304 and 316, but suitable for general environments.
Magnetic Properties: Magnetic.

5. Stainless Steel Bearing Applications

(1) Stainless Steel Bearing Material Selection Guide

440C Stainless Steel Bearings: High hardness and excellent wear resistance, ideal for high-speed rotating equipment, precision machine tools, and other high-load environments.
304 Stainless Steel Bearings: Exceptional corrosion resistance, widely used in industries requiring high hygiene and safety standards, such as food, medical, and chemical applications.
316 Stainless Steel Bearings: The preferred material for marine and chemical environments due to its superior corrosion resistance.
420 Stainless Steel Bearings: Suitable for general machinery and electrical equipment where corrosion resistance is not a primary concern.

(2) Material Selection Recommendations

Choose the appropriate bearing material based on application requirements:

High load and wear resistance → 440C
Good corrosion resistance → 304 / 316 (316 for more extreme conditions)
General mechanical applications → 420

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