Q275 Special Alloy

Chemical composition%of the ladle analysis of gradeQ275

C(%)Si(%)Mn(%)P(%)S(%)Cr(%)Ni(%)Cu(%)
0.28~0.38≤0.350.50~0.80≤0.045≤0.050≤0.30≤0.30≤0.30

Mechanical properties


The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | than 16:275
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 16 ~ 40:265
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 40 to 60:255
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 60 ~ 100:245
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 100 ~ 150:235
The yield point σ s/MPa (no less) than in steel different thickness or diameter/mm | > 150:225

Tensile strength σ b/MPa: 490 ~ 630
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | than 16:20
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 16 ~ 40:19
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 40 to 60:18
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 60 ~ 100:17
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 100 ~ 150:16
Elongation δ 5 / (%) (no less) than in steel different thickness or diameter/mm | > 150:15
Impact test (1) | temperature / ℃ :-
Impact test (1) | impact absorption power AKV/J:-

The cold bending property


Sample direction:-
180 ° of cold bending test b = 2 a different thickness or in steel diameter/mm | than 60: d = 3 a
180 ° of cold bending test b = 2 a different thickness or in steel diameter/mm | > 60 ~ 100: d = 4 a
180 ° of cold bending test b = 2 a different thickness or in steel diameter/mm | > 100 ~ 200: d = 4.5 a

Mechanical properties of gradeQ275

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)
556(≥) 414(≥) 43 21 44 Solution and Aging,Annealing,Ausaging,Q+T,etc 434

Physical properties of grade Q275

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
374(≥) 932(≥) 14 31 44 Solution and Aging,Annealing,Ausaging,Q+T,etc 334
Temp.
°C/°F
Creep strain limit
(10000h)
(Rp1,0)N/mm2
Creep rupture strength
(10000h)
(Rp1,0)N/mm2
376 285 687

Q275 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

Equivalent Grade