24 July 2021 Ball Bearing Steel Bar
GCr15 Ball Bearing Steel Bar
GCr15 is a common steel which is used to produce balls and rings of bearing. The product has characteristics of the uniform-chemical composition, low percentage of harmful elements, high purity, well-distributed carbide, good surface quality.
It also has characteristics of a wide scope of plastic，stable heat-treatment quality, uniform, and high hardness, high wear resistance, high strength of touching fatigue. It has excellent machining property after spheroidize annealing. GB GCr15 bearing steel is GB standard Alloy Bearing steel, It belong to the high-quality high carbon, alloy chromium, manganese steel.
GB GCr15 is a chromium, manganese alloy steel specification. GCr15 is equivalent to AISI 52100 , DIN 100Cr6 . Most applications can replace each other.
Chemical Composition:
| C | Si | Mn | Cr | Mo ≤ | Ni ≤ | Cu ≤ | P ≤ | S ≤ | Ca ≤ | O ≤ | Ti ≤ | Al ≤ | As ≤ | As+Sn+Sb ≤ | Pb ≤ |
| 0.95-1.05 | 0.15-0.35 | 0.25-0.45 | 1.40-1.65 | 0.10 | 0.25 | 0.25 | 0.025 | 0.02 | – | 0.0012 | 0.005 | 0.05 | 0.04 | 0.075 | 0.002 |
Mechanical Properties:
| Yield Strength Rp0.2(MPa) | Tensile Strength Rm(MPa) | Impact Energy KV(J) | Elongation at Fracture A(%) | Reduction in Cross Section on Fracture Z(%) | As-Heat-Treated Condition | Brinell Hardness(HBW) |
|---|---|---|---|---|---|---|
| 154(≥) | 694(≥) | 41 | 11 | 43 | Solution and Aging,Annealing,Ausaging,Q+T,etc | 433 |
| Property | Density kg/dm3 | Temperature T °C/F | Specific heat J/kgK | Thermal conductivity W/mK | Electric resistance µΩ·cm | Modulus of elasticity kN/mm2 | Expansion rate |
|---|---|---|---|---|---|---|---|
| 787(≥) | 165(≥) | 14 | 33 | 42 | Solution and Aging,Annealing,Ausaging,Q+T,etc | 433 | |
| Temperature. °C/°F | Creep strain limit (10000h) (Rp1,0)N/mm2 | Creep rupture strength (10000h) (Rp1,0)N/mm2 | |||||
| 137 | 919 | 183 |
Heat treatment Related
- Annealing
Slowly heated to 790-810 ℃ and allow enough times, let the steel to be thoroughly heated, Then cool slowly in the furnace. Different annealing ways will get different hardness.The GCr15 bearing steel will get Hardness MAX 248 HB （Brinell hardness）.
- Quenching and temperature
Heated slowly to 860°C, Then quenching by oil get 62 to 66 HRc hardness. High temperature tempering: 650-700℃，cool in air, get hardness 22 to 30HRC. Low temperature tempering: 150-170 ℃， Cool in air, get 61-66HRC hardness.
- Hot work and cold work
GCr15 steel can hot worked at 205 to 538°C, GCr15 Bearing steel can be cold worked using conventional techniques in the annealed or normalized conditions.
Processing
GCr15 bearing steel round bar and flat sections can be cut to your required sizes. Also it is a high quality tool steel precision ground tool steel bar to your required tolerances. GCr15 steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes.
Applications
GCr15 steel is widely used for a variety of applications in the used to the bearings in rotating machinery. Typical applications such as valve bodies, pumps and fittings, the high load of wheel, bolts, double-headed bolts, gears, internal combustion engine. Electric locomotives, machine tools, tractors, steel rolling equipment, boring machine, railway vehicle, and mining machinery transmission shaft on the steel ball, roller and shaft sleeve, etc.