50Application:China structural steel and alloy steel
Category	Type	Steel grade	Standard	Country
Grades	Special Alloy	50	GBT	China

Chemical composition%of the ladle analysis of grade50

C(％)	Si(％)	Mn(％)	P(％)	S(％)	Cr(％)	Ni(％)	Cu(%)
0.47-0.55	0.17-0.37	0.50-0.80	0.035	0.035	0.25	0.3	0.25

Mechanical properties of grade50
Proof strength R_p0.2(MPa)	Tensile strength R_m(MPa)	Impact energy KV(J)	Elongation at fracture A(%)	Reduction in cross section on fracture Z(%)	As-Heat-Treated Condition	Brinell hardness(HBW)
965(≥)	283(≥)	24	41	42	Solution and Aging,Annealing,Ausaging,Q+T,etc	121

Physical properties of grade50
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
151(≥)	592(≥)	41	11	42	Solution and Aging,Annealing,Ausaging,Q+T,etc	423
Temp. °C/°F	Creep strain limit (10000h) (Rp1,0)N/mm2	Creep rupture strength (10000h) (Rp1,0)N/mm2
637	111	568

50Range of products
Product type	Products	Dimension	Processes	Deliver Status
Plates/Sheets	Plates/Sheets	0.08-200mm(T)WL	Forging,hot rolling and cold rolling	Annealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting
Steel Bar	Round Bar,Flat Bar,Square Bar	Φ8-1200mm*L	Forging,hot rolling and cold rolling,Cast	Black,Rough Turning,Shot Blasting,
Coil/Strip	Steel Coil/Steel Strip	0.03-16.0x1200mm	Cold-Rolled&Hot-Rolled	Annealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting
Pipes/Tubes	Seamless Pipes/Tubes,Welded Pipes/Tubes	OD:6-219mm x WT:0.5-20.0mm	Hot extrusion,Cold Drawn,Welded	Annealed,Solution and Aging,Q+T,ACID-WASHED

Cross Reference Table(Equivalent Grade)
Grade	Standard	Country	Application
G2500	GBT	China	Used in the products of the automobile, truck, tractor, and allied industries; small cylinder blocks, cylinder heads, air cooled cylinders, pistons, clutch plates, oil pump bodies, transmission cases, gear boxes, clutch housings, and light-duty brake drum
G2500a	GBT	China	Used in the products of the automobile, truck, tractor, and allied industries
G3500	GBT	China	Used in the products of the automobile, truck, tractor, and allied industries
G3500b	GBT	China	Diesel engine cylinder block, truck and tractor cylinder block and cylinder head, flywheel, tractor transmission case and heavy-load gear box
G3500c	GBT	China	Used in the products of the automobile, truck, tractor, and allied industries
S20501	GBT	China	Stainless steel and heat resistant steel
S21500	GBT	China	Austenitic Chromium Manganese Nickel Molybdenum Stainless Steel
S47450	GBT	China	Steels of blade for steam turbine
S47670	GBT	China	Steels of blade for steam turbine
A 240 S30500	GBT	China	Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
A 249 S30500	GBT	China	Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
A 276 S30500	GBT	China	Stainless Steel Bars and Shapes
A 313 S30500	GBT	China	Stainless Steel Spring Wire
A 314 S30500	GBT	China	Stainless Steel Billets and Bars for Forging
A 368 S30500	GBT	China	Stainless Steel Wire Strand
A 473 S30500	GBT	China	Stainless Steel Forgings
A 478 S30500	GBT	China	Chromium-Nickel Stainless Steel Weaving and Knitting Wire
A 492 S30500	GBT	China	Stainless Steel Rope Wire
A 493 S30500	GBT	China	Stainless Steel Wire and Wire Rods for Cold Heading and Cold Forging
A 580 S30500	GBT	China	Stainless Steel Wire