GCr15 round rod

GCr15 round rod

GCr15 steel is a representative steel grade of high carbon chromium bearing steel, with excellent comprehensive performance. After quenching and tempering, the hardness is high and uniform, and the wear resistance and contact fatigue strength are high. Good heat workability. After spheroidization annealing, it has good processability, but is sensitive to the formation of white spots. Mainly used for manufacturing steel balls, rollers, and shaft sleeves on transmission shafts of internal combustion engines, electric locomotives, machine tools, tractors, steel rolling equipment, drilling machines, railway vehicles, and mining machinery

1. Performance parameters

GCr15 is a high carbon chromium bearing steel known for its high hardness, wear resistance, and contact fatigue strength. Its specific properties are as follows:

• Mechanical properties: GCr15 bearing steel rod

• Annealed state: HB 170-2298

• After quenching and low-temperature tempering: HRC 61-66812

• Tensile strength: ≥ 861 MPa (in supply state) 8

• Yield strength: ≥ 518 MPA8

• Elongation rate: ≥ 27.95% 8

• Hardness:

• Wear resistance: superior to GCr9, suitable for high load rolling contact scenarios 811.

• Hot workability: Good, but avoid low-temperature brittle zone (<800 ℃) 312.

• Disadvantages: Poor weldability, sensitive to white spots, and prone to temper brittleness 811.

2. Chemical composition of GCr15 bearing steel rod

The main component range of GCr15 (mass fraction%):

• Carbon (C): 0.95-1.05% (core strengthening element) 38

• Chromium (Cr): 1.30-1.65% (improves hardness and corrosion resistance) 812

• Silicon (Si): 0.15-0.35%, Manganese (Mn): 0.20-0.40% (deoxidation and microstructure refinement) 8

• Impurity control: sulfur (S) ≤ 0.020%, phosphorus (P) ≤ 0.027%.

3. Heat treatment process

The performance of GCr15 is highly dependent on heat treatment, and typical processes include:

(1) Annealing

• Ordinary annealing: heated at 790-810 ℃, cooled in the furnace to 650 ℃ and then air cooled, with a hardness of HB 170-2078.

• Isothermal annealing: heated at 790-810 ℃, air cooled at 710-720 ℃, hardness HB 207-2298.

(2) Quenching and tempering

• Quenching: Oil quenching at 860 ℃ to obtain a high hardness martensitic structure (HRC 62-66) 812.

• Low temperature tempering: Temper at 150-170 ℃, maintain HRC 61-66 after air cooling, and reduce internal stress by 8.

(3) Other processes

• Normalization: Heating and air cooling at 900-920 ℃, used for refining grain size 8.

• Carbon nitrogen co infiltration: After co infiltration at 820-830 ℃, deep cold treatment is carried out to further improve the surface hardness (HRC ≈ 67).

4. Recommended cutting retail manufacturers

The following are enterprises providing retail cutting services for GCr15 bearing steel (some including small batch procurement options):

1. Jiangsu Jiuming Special Steel Co., Ltd

• Product: GCr15 round steel, specifications 10-300mm, supports direct sales.

• Address: 289 Industrial Zone, Fangcheng Avenue, Jiangxi Street, Xinwu District, Wuxi City, Jiangsu Province.
  

5. Application fields of GCr15 bearing steel bars

GCr15 is widely used in high wear resistance and high fatigue strength scenarios:

• Bearing manufacturing: steel balls, rollers, rings (such as automotive and machine tool bearings) 812.

• Precision tools: measuring tools, cold stamping dies, ball screw 811.

• Heavy machinery: mining equipment, steel rolling mill transmission components 3.

GCr15 round rodPrecautions

• Processing suggestion: Cold processing should be accompanied by intermediate annealing to avoid cracking; Welding requires preheating and control of heat input 811.

• Procurement Tip: Choose a supplier that supports original factory warranty and pay attention to controlling the non-metallic inclusion content of 1114.

If you need more detailed cutting specifications or prices, you can directly contact the above-mentioned manufacturers to obtain a quotation.