Q235 B Special Alloy

Chemical composition%of the ladle analysis of gradeQ235 B

C(%)Si(%)Mn(%)P(%)S(%)Cr(%)Ni(%)Cu(%)
0.12~0.20≤0.300.30~0.70≤0.045≤0.045≤0.30≤0.30≤0.30

Mechanical properties

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


Tensile strength σ b/MPa: 375 ~ 450
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | than 16:26
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 16 ~ 40:25
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 40 to 60:24
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 60 ~ 100:23
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 100 ~ 150:22
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 150:21
Impact test (1) | temperature / ℃ : 20
Impact test (1) | impact absorption power AKV/J: 27 frequency 

Mechanical properties of gradeQ235 B

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 Condition Brinell hardness(HBW)
466(≥) 936(≥) 42 23 44 Solution and Aging,Annealing,Ausaging,Q+T,etc 144

Physical properties of grade Q235 B

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
Expansion rate
492(≥) 768(≥) 42 14 21 Solution and Aging,Annealing,Ausaging,Q+T,etc 422
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0)N/mm2
Creep rupture strength
(10000h)
(Rp1,0)N/mm2
327 152 535

Q235 B Range of products

Product type Products Dimension Processes Deliver Status
Plates/Sheets Plates/Sheets 0.08-200mm(T)*W*L 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