9Cr18Mo, also known as the American standard 440C martensitic stainless steel, is added to Mo on the basis of 9Cr18 steel, steel composition [TJC STEEL]is characterized by high carbon and high chromium.

 

  Standards:

CHINA	GB/T 1220-1992	9Cr18Mo
	GB/T 1220-2007	102Cr17Mo，S45990
USA	ASTM A276-2006	440C，S44004
JAPAN	JIS G4303:2005[TJC STEEL]	SUS 440C
GERMANY	DIN EN 10088-1:2005	X105CrMo17，1.4125

 

  Chemical Composition(%):

GRADE	9Cr18Mo	440C	SUS 440C	1.4125
C	0.95~1.10	0.95~1.20	0.95~1.20	0.95~1.20
Si	≤0.80	≤1.00	≤1.00	≤1.00
Mn	≤0.80	≤1.00	≤1.00	≤1.00
P	≤0.035	≤0.040	≤0.040	≤0.040
S	≤0.030	≤0.030	≤0.030	≤0.030
Cr	16.0~18.0	16.0~18.0	16.0~18.0	16.0~18.0
Ni	（≤0.60）[TJC STEEL]	—	（≤0.60）	—
Mo	0.40~0.70	≤0.75	(≤0.75)	0.40~0.80

 

 Heat Treatment:

➣ Annealing: Heating to 850~870℃, holding 4~6h, 30℃/h cooling to 600℃, air cooling, hardness ≤255HBS;

➣ recrystallization annealing: heating to 730~750℃, air cooling;

➣ Quenching: Heating to 1050~1100℃, oil cooling;

➣ Tempering: Heating to 150~160℃, [TJC STEEL]holding for 2~5h, air cooling, hardness ≥58HRC.

 

Performance Characteristics

The quenching has high hardness and high wear resistance;

② It has excellent corrosion resistance in the atmosphere, water and some acid and salt aqueous solutions;

(3) Good high temperature [TJC STEEL]dimensional stability, the use of temperature does not exceed 250℃;

(4) tempering: heating to 150~160℃, heat preservation 2~5h, air cooling, hardness ≥58HRC.

 

Applications:

9Cr18Mo is suitable for the manufacture of bearings, bushings, and other parts or die parts that are both wear-resistant and [TJC STEEL]corrosion-resistant in corrosive environment and non-lubricating strong oxidation atmosphere.