45Application:China structural steel and alloy steel
Category	Type	Steel grade	Standard	Country
Grades	Special Alloy	45	GBT	China

Chemical composition%of the ladle analysis of grade45

C(％)	Si(％)	Mn(％)	P(％)	S(％)	Cr(％)	Ni(％)	Cu(%)
0.42-0.50	0.17-0.37	0.50-0.80	0.035	0.035	0.25	0.3	0.25

Mechanical properties of grade45
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)
258(≥)	723(≥)	32	22	12	Solution and Aging,Annealing,Ausaging,Q+T,etc	243

Physical properties of grade45
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
222(≥)	481(≥)	13	42	43	Solution and Aging,Annealing,Ausaging,Q+T,etc	212
Temp. °C/°F	Creep strain limit (10000h) (Rp1,0)N/mm2	Creep rupture strength (10000h) (Rp1,0)N/mm2
352	945	639

45Range 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
GH4145	GBT	China	Nickel-base superalloy
S47450	GBT	China	Steels of blade for steam turbine
S47670	GBT	China	Steels of blade for steam turbine
A 581 S30345	GBT	China	Free-Machining Stainless Steel Wire and Wire Rods
A 582 S30345	GBT	China	Standard Specification for Free-Machining Stainless Steel Bars
S30345	GBT	China	Austenitic Chromium Nickel Aluminum Free-Machining Stainless Steel
A 240 Type XM-21	GBT	China	Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
A 276 XM-21	GBT	China	Stainless Steel Bars and Shapes
A 959 Type XM-21	GBT	China	Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
SA-276 XM-21	GBT	China	Specification for Stainless Steel Bars and Shapes
XM-21	GBT	China	Chemical compositions of SAE wrought stainless steels
A 240 S30452	GBT	China	Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
A 276 S30452	GBT	China	Stainless Steel Bars and Shapes
S30452	GBT	China	Austenitic Chromium Nickel Stainless Steel
SA-240 S30452	GBT	China	Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
304LN	GBT	China	Chemical compositions of SAE wrought stainless steels
A 167 Type 304LN	GBT	China	Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and Strip
A 182 F 304LN	GBT	China	Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
A 213 TP304LN	GBT	China	Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
A 240 Type 304LN	GBT	China	Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications