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Q235Application:Engineering and welding
CategoryTypeSteel gradeCountry
Grades Special Alloy Q235China

Chemical composition%of the ladle analysis of gradeQ235

C(%)Si(%)Mn(%)P(%)S(%)Cr(%)Ni(%)Cu(%)
0.14~0.22≤0.300.30~0.65≤0.045≤0.050≤0.30≤0.30≤0.30

Mechanics performance


The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | ≤ 16:235
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 16 ~ 40:225
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 40 to 60:215
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 60 ~ 100:205
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 100 ~ 150:195
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 150:185

Cold bending property


Sample direction: vertical
180 ° of cold bending test b = 2 a different thickness or in steel diameter/mm | than 60: d = a
180 ° of cold bending test b = 2 a different thickness or in steel diameter/mm | > 60 ~ 100: d = 2 a
180 ° of cold bending test b = 2 a different thickness or in steel diameter/mm | > 100 ~ 200: d = 2.5 a

Performance characteristics and applications


Good strength and cold, heat pressure processing performance sex and welding is a bit poor performance.
Widely used in the manufacture of sheet, steel bar, steel structure with all kinds of steel, building structure, Bridges, engine, mechanical parts, carburizing or carbon nitrogen were permeability parts, components, support, force not big pole, connecting rod, pin, shaft, screw, nut, rings, etc
 

 

GB/T 700-1988 standard and GB 700-1979 standard steel grade comparison

GB/T 700-1988 standadr:

Regardless of rank, the chemical composition and mechanical properties (σ s, σ b, the delta and the cold bending) are to be guaranteed

Rolling plate and rod of products, the mechanical properties of the guarantee condition, can according to product characteristics and application requirements, in the standard separately

GB 700-1979 standard

A1 the mechanical properties of the steel guarantee (σ s, σ b, the delta and the cold bending), B1 steel guarantee the chemical composition of the same with Q195

A1 steel cold bending test is additional guarantee conditions

1 no special steel of steel

Mechanical properties of gradeQ235
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)
246(≥)317(≥)322314Solution and Aging,Annealing,Ausaging,Q+T,etc422
Physical properties of gradeQ235
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
947(≥)212(≥)222422Solution and Aging,Annealing,Ausaging,Q+T,etc132
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0)N/mm2
Creep rupture strength
(10000h)
(Rp1,0)N/mm2
211787387
Q235Range 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

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