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.