40Application:China structural steel and alloy steel
Category	Type	Steel grade	Standard	Country
Grades	Special Alloy	40	GBT	China

Chemical composition%of the ladle analysis of grade40

C(％)	Si(％)	Mn(％)	P(％)	S(％)	Cr(％)	Ni(％)	Cu(%)
0.37-0.44	0.17-0.37	0.50-0.80	0.035	0.035	0.25	0.3	0.25

Mechanical properties of grade40
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)
287(≥)	724(≥)	34	23	14	Solution and Aging,Annealing,Ausaging,Q+T,etc	442

Physical properties of grade40
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
712(≥)	751(≥)	22	43	44	Solution and Aging,Annealing,Ausaging,Q+T,etc	313
Temp. °C/°F	Creep strain limit (10000h) (Rp1,0)N/mm2	Creep rupture strength (10000h) (Rp1,0)N/mm2
695	547	257

40Range 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
G4000	GBT	China	Used in the products of the automobile, truck, tractor, and allied industries. Diesel engine castings, liners, cylinders, and pistons.
G4000a	GBT	China	Used in the products of the automobile, truck, tractor, and allied industries. Diesel engine castings, liners, cylinders, and pistons.
GH1040	GBT	China	Classification and designation for superalloys and high temperature intermetallic materials
GH1140	GBT	China	Classification and designation for superalloys and high temperature intermetallic materials
GH4033	GBT	China	Classification and designation for superalloys and high temperature intermetallic materials
GH4037	GBT	China	Classification and designation for superalloys and high temperature intermetallic materials
GH4043	GBT	China	Classification and designation for superalloys and high temperature intermetallic materials
GH4049	GBT	China	Classification and designation for superalloys and high temperature intermetallic materials
S20400	GBT	China	S20400
XM-31	GBT	China	Chemical compositions of SAE wrought stainless steels
S21400	GBT	China	Chemical compositions of SAE wrought stainless steels
A 240 Type XM-29	GBT	China	Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
A 249 TPXM-29	GBT	China	Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
A 269 TPXM-29	GBT	China	Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes
A 276 XM-29	GBT	China	Stainless Steel Bars and Shapes
A 312 TPXM-29	GBT	China	Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
A 314 XM-29	GBT	China	Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes
A 358 XM-29	GBT	China	Electric-Fusion-Welded Austenitic Chromium-Nickel Stainless Steel Pipe for High-Temperature Service and General Applications
A 412 Type XM-29	GBT	China	Stainless and Heat-Resisting Chromium-Nickel-Manganese Steel Plate, Sheet, and Strip
A 479 XM-29	GBT	China	Stainless Steel Bars and Shapes for Use in Boilers and Other Pressure Vessels