Nerezová ocel 95Cr18 | 9Cr18

AOBO STEEL – Trusted Global Tool Steel Supplier

In China’s GB standards, 9Cr18 and 95Cr18 actually refer to the same type of steel. 95Cr18 is the new designation for 9Cr18 steel.

The old designation 9Cr18 originates from the GB/T 1220-1992 standard. It is primarily based on carbon and chromium content, with “9” representing a carbon content of approximately 0.9% and “18” representing a chromium content of approximately 18%.

The new grade 95Cr18 is named according to the latest GB/T 1220-2007 standard. The new naming convention is more standardized, with “95” representing a carbon content of approximately 0.95%, which more accurately indicates the carbon content compared to the old grade.

95Cr18 steel is a high-carbon, high-chromium martensitic stainless steel. It has high hardness, wear resistance, and corrosion resistance. This steel also exhibits good hot plasticity and low heat treatment deformation tendencies.

1. Chemické složení(GB/T 1220—2007)

C	Si	Mn	Cr	S	P
0.90% to 1.00%	≤0,80%	≤0,80%	17.00% ~ 19.00%	≤0,030%	≤0,040%

For the improved version, “9Cr18Mo” (also known as AISI 440C), the composition includes Molybdenum (Mo) typically in the range of 0.40% to 0.70%.

2. Fyzikální vlastnosti of 95Cr18(9Cr18)

Critical Point Temperature

Kritický bod	Temperature (approximate) / °C
Ac1	830
Ar₁	810

Lineární expanzní koeficient

Teplota / °C	Linear Expansion Coefficient α / (10⁻⁶ °C⁻¹)
20 ~ 100	10.5
20 ~ 200	11
20 ~ 300	11
20 ~ 400	11.5
20 ~ 500	12

Other Physical Properties

Vlastnictví	Hodnota
Density / (g/cm³)	7.7
Modulus of Elasticity E(20°C) / MPa	203,890
Specific Heat Capacity cₚ(20°C) / [J/(kg·K)]	459.8
Thermal Conductivity λ(20°C) / [W/(m·K)]	29.3
Electrical Resistivity ρ(20°C) / (10⁻⁶ Ω·m)	0.6

Are you looking for a 9Cr18 Stainless Steel supplier? Please fill out the form below to contact us today!

3. Forging Process of 95Cr18(9Cr18)

Furnace Charging Temperature	Initial Forging Temperature / °C	Final Forging Temperature / °C	Chlazení
Cold charging temp. ≤600°C, Hot charging temp. unlimited	1050 ~ 1100	≥850	Furnace cooling

Note: The heating speed of the hot working process should not be too fast. The stop forging (rolling) temperature should be controlled at a higher level, and slow cooling conditions must be strictly followed.

4. Heat Treatment of 95Cr18(9Cr18)

4.1 Preliminary Heat Treatment Specification of 95Cr18 Steel

Preliminary Heat Treatment Plan	Teplota ohřevu / °C	Způsob chlazení	Hardness HBW
Softening Annealing	800 ~ 840	Furnace cool to 500°C, then air cool	≤255¹
Full Annealing	840 ~ 860	Furnace cooling	≤255¹

Note: ① The annealed structure is pearlite.

4.2 Quenching and Tempering

4.2.1 Quenching and Tempering Process Specification of 95Cr18 Steel

Quenching Temp. / °C	Způsob chlazení	Hardness HRC (Quenching)	Tempering Temp. / °C	Hardness HRC (Tempering)
1030 ~ 1070	Oil cooling	≥55	200 ~ 300	56

4.2.2 Hardness, Retained Austenite Content, and Impact Toughness

Quenching Temp. / °C	Tvrdost HRC	Retained Austenite (vol. fraction, %)	aₖ / (J/cm²)
800	35	—	31
900	48	—	17
950	52	1.7	14
1000	57	5.2	11
1050	60	29.2	10
1100	53	93.9	15
1150	42	97	22
1200	35	99	26

4.2.3 Effect of Different Tempering Temperatures on Hardness and Impact Toughness

Tempering Temp. / °C	After Quenching	100	200	300	400	450	500	550	600	650
Tvrdost HRC	60	60	58	55	56	57	54	47	40	32
aₖ / (J/cm²)	11.5	20	28	29	24	22	21	25	30	—

4.3 Cold Treatment

4.3.1 Cold Treatment Process Specification

Cold Treatment Process	Hardness HBW
1000°C × 10min + -73°C × 6-8h + 100-200°C × 30-40min Air Cooling	55 ~ 60

4.3.2 Effect of Cold Treatment on the Hardness

Quenching Temperature/°C	Tvrdost HRC	Hardness HRC after cooling to -75°C and holding for 1h	Hardness HRC after Tempering (Tempering Temperature)
Quenching Temperature/°C	Tvrdost HRC	Hardness HRC after cooling to -75°C and holding for 1h	100°C	150 °C	200°C
1000	58	—	58	57	55
1000	59	59.5	59.5	59	57
1050	60	61.5	61	61	59
1100	60.5	62	62	62	60.5

5. Corrosion Resistance of 95Cr18 (9Cr18) Steel

Střední	Mass Fraction (%)	Temperature/℃	Corrosion Rate /mm⋅a^-1
Nitric acid	5 – 20	20	< 0.1
	5	60 ~ Boiling	< 1.0
	20	60	< 0.1
	20	80	< 1.0
	20	Boiling	2.0 ~ 3.0
	40	60 ~ 80	< 1.0
	40	Boiling	3.0 ~ 10.0
	50	20	< 0.1
	50	80	< 1.0
	60	20	< 0.1
	60	60 ~ 80	< 1.0
	60	Boiling	1.0 ~ 3.0
	90	20	< 1.0
	90	Boiling	3.0 ~ 10.0
Acetic acid	5	20	< 1.0
	5	50 ~ 75	3.0 ~ 10.0
	5	Boiling	> 10.0
	25	50 ~ 75	3.0 ~ 10.0
	25	Boiling	> 10.0
	50	20	< 0.1
	50	50	3.0 ~ 10.0
	50	75	> 10.0
Phosphoric acid	1	20	< 0.1
	10	20	< 3.0
	15	20	3.0 ~ 10.0
Sulfuric acid	5	20	> 10.0
	5	50	> 10.0
	5	80	> 10.0
Hydrochloric acid	0.5	20	< 1.0
	0.5	50	< 3.0
	0.5	Boiling	> 10.0
	1	20	< 3.0
	1	50	3.0 ~ 10.0

Your Premier Source for 9Cr18 Stainless Steel

Leverage our 20+ years of expertise. We supply top-grade 9Cr18 stainless steel, ideal for high-wear and corrosion-resistant applications. Contact our specialists for detailed specifications and a competitive quote.

Odborné pokyny

Market-Leading Prices

Naše produkty