9Cr18Mo, 440C, SUS440C, 1.4125 High Carbon Chromium Martensitic Stainless Steel- SCALE STEEL.

​9Cr18Mo, also known as the American standard 440C martensitic stainless steel, is added to Mo on the basis of 9Cr18 steel, steel composition [SCALE 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[SCALE 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）[SCALE 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℃, [SCALE 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 [SCALE 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 [SCALE STEEL]corrosion-resistant in corrosive environment and non-lubricating strong oxidation atmosphere.