Products

GCr15 – JIS:SUJ2 Carbon Bearing Steel Pipe Krobo Steel

Product Name Carbon Steel Pipes
Length 4m-12m or as required
Out Dia 20mm-610mm
Wall Thickness 4mm-70mm
Standard  ASTM,API,DIN,ISO,MTC
Technique Hot rolled
Surface Treatment Clean, blasting and painting according
to customer requirement
Dia tolerance Control with in the standard, OD:+-1%, WT:+-10%
Material GCr15
Shipment time Within 15-20 workdays after receiving deposit or L/C
Export packing Waterproof paper, and steel strip packed.
Standard Export Seaworthy Package.Suit for all kinds of transport,or as required

GCr15 bearing steels is a high-carbon chromium alloy steel, which, because of its versatility, is used in a variety of mechanical applications. In the annealed condition this steel is comparatively easy to machine, yet very high hardness and abrasion resistance

can be developed by heat treatment to make the steel particularly suitable for applications requiring extreme wear resistance.

In addition,GCr15 bearing steels can be heat treated to high levels of tensile strength and fatigue strength.

Chemical composition

C(%)

0.95~1.05

Si(%)

0.15~0.35

Mn(%)

0.25~0.45

P(%)

≤0.025

S(%)

≤0.025

Cr(%)

1.40~1.65

 

 

 

 
  • Annealingof GCr15 Alloy bearing steel

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 of GCr15 Alloy bearing steel

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 ari, get 61-66HRC hardness.

  • Hot work and cold work of GCr15 Alloy bearing steel

GB 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.

Mechanical Properties

The mechanical properties of annealed GB GCr15 bearing steel (typical for steel) are outlined in the table below:

Tensile

Yield

Bulk modulus

Shear modulus

Poisson’s ratio

Thermal conductivity

MPa

Mpa

Gpa

Gpa

 

 W/mK

520

415 Min

140

80

0.27-0.30

46.6

Application:

GB 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.

Chemical composition
C(%)0.95~1.05Si(%)0.15~0.35Mn(%) 0.25~0.45P(%)≤0.025
S(%)≤0.025Cr(%)1.40~1.65    
Mechanical Properties
TensileYieldBulk modulusShear modulusPoisson’s ratioThermal conductivity
MPaMpaGpaGpa  W/mK
520415 Min140800.27-0.3046.6