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GB 70Application:China structural steel and alloy steel
CategoryTypeSteel gradeStandardCountry
Grades Special Alloy GB 70GBTChina

Chemical composition%of the ladle analysis of gradeGB 70

C(％)Si(％)Mn(％)P(％)S(％)Cr(％)Ni(％)
0.62-0.700.17-0.370.50-0.800.0350.035Max 0.25Max 0.25
70
Mechanical properties of gradeGB 70
Proof strength
Rp0.2(MPa)		Tensile strength
Rm(MPa)		Impact energy
KV(J)		Elongation at fracture
A(%)		Reduction in cross section on fracture
Z(%)		As-Heat-Treated ConditionBrinell hardness(HBW)
694(≥)824(≥)343322Solution and Aging,Annealing,Ausaging,Q+T,etc242
Physical properties of gradeGB 70
PropertyDensity
kg/dm3		Temperature T
°C/F		Specific heat
J/kgK		Thermal conductivity
W/mK		Electric resistance
µΩ·cm		Modulus of elasticity
kN/mm2		Expansion rate
194(≥)595(≥)412221Solution and Aging,Annealing,Ausaging,Q+T,etc244
Temp.
°C/°F		Creep strain limit
(10000h)
(Rp1,0)N/mm2		Creep rupture strength
(10000h)
(Rp1,0)N/mm2
439975893
GB 70Range of products
Product typeProductsDimensionProcessesDeliver Status
Plates/SheetsPlates/Sheets0.08-200mm(T)*W*LForging,hot rolling and cold rollingAnnealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting
Steel BarRound Bar,Flat Bar,Square BarΦ8-1200mm*LForging,hot rolling and cold rolling,CastBlack,Rough Turning,Shot Blasting,
Coil/StripSteel Coil/Steel Strip0.03-16.0x1200mmCold-Rolled&Hot-RolledAnnealed,Solution and Aging,Q+T,ACID-WASHED,Shot Blasting
Pipes/TubesSeamless Pipes/Tubes,Welded Pipes/TubesOD:6-219mm x WT:0.5-20.0mmHot extrusion,Cold Drawn,WeldedAnnealed,Solution and Aging,Q+T,ACID-WASHED
Cross Reference Table(Equivalent Grade)
GradeStandardCountryApplication
GH3170GBTChina
Iron-based superalloy
S47450GBTChina
Steels of blade for steam turbine
S47670GBTChina
Steels of blade for steam turbine
317GBTChina
Steel, Corrosion Resistant, Bars, Wire, Shapes, and Forgings
317GBTChina
Steel, Corrosion Resistant, Bars, Wire, Shapes, and Forgings
317GBTChina
Steel, Corrosion Resistant, Bars, Wire, Shapes, and Forgings
A 167 Type 317GBTChina
Stainless and Heat-Resisting Chromium-Nickel Steel Plate, Sheet, and Strip
A 182 F 317GBTChina
Standard Specification for Forged or Rolled Alloy and Stainless Steel Pipe Flanges, Forged Fittings, and Valves and Parts for High-Temperature Service
A 213 TP317GBTChina
Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
A 240 Type 317GBTChina
Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications
A 276 317GBTChina
Stainless Steel Bars and Shapes
A 314 317GBTChina
Stainless Steel Billets and Bars for Forging
A 358 317GBTChina
Electric-Fusion-Welded Austenitic Chromium-Nickel Stainless Steel Pipe for High-Temperature Service and General Applications
A 403 WP 317GBTChina
Standard Specification for Wrought Austenitic Stainless Steel Piping Fittings
A 409 TP317GBTChina
Welded Large Diameter Austenitic Steel Pipe for Corrosive or High-Temperature Service
A 473 317GBTChina
Stainless Steel Forgings
A 511 MT317GBTChina
Seamless Stainless Steel Mechanical Tubing
A 554 MT 317GBTChina
Welded Stainless Steel Mechanical Tubing
A 580 Type 317GBTChina
Stainless Steel Wire
A 632 Grade TP 317GBTChina
Seamless and Welded Austenitic Stainless Steel Tubing (Small-Diameter) for General Service

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