Standard: GB / T 1220-1992
JIS G4311: 1991
  ASTM A959 2004
ISO 4955:2005 (E)
● Features and application:
9Cr18Mo is the production of bearing rings and rolling with a high carbon chromium stainless steel. Cutting and slicing machines for stainless steel cutting tools, surgical blades, high wear-resistant equipment, spare parts. 9Cr18 martensitic stainless high carbon chromium bearing steel. After quenching with high hardness and wear resistance, high temperature, low temperature dimensional stability. 9Cr18Mo features and use the same basic and 9Cr18 steel, but has a higher hardness after quenching and tempering resistance stability of the passivation of stainless steel to increase the role of molybdenum. 9Cr18, 9Cr18Mo carbon chromium stainless steel ball Applications: suitable for manufacture in the sea water, river water, nitric acid, steam, and marine and other corrosive media bearing, such as ships, submersible pump components of bearings, oil and chemical machinery bearings, marine instrument bearings.
● Chemical Composition:
Carbon C: 0.90 ~ 1.00
Si Si: ≤ 0.80
Manganese Mn: ≤ 0.80
Sulfur S: ≤ 0.030
Phosphorus P: ≤ 0.035
Chromium Cr: 17.00 ~ 19.00
Ni: to allow containing ≤ 0.60
Mo Mo: ≤ 0.75 can be added
● Mechanical Properties:
Hardness: Annealed, ≤ 255HB; quenching and tempering, ≥ 55HV
● Heat treatment and microstructure specifications:
Heat treatment specifications: 1) annealing, 800 ~ 920 ℃ slow cooling; 2) quenching, 1000 ~ 1050 ℃ oil cooling; 3) temper, 200 ~ 300 ℃ oil, air-cooled.
Microstructure: Organizing for the martensitic type.
● Delivery status: normal to heat treatment delivery, the treatment types specified in the contract; not indicated, according to the heat treatment state of delivery.