Q275

Q275 Special Alloy

Chemical composition%of the ladle analysis of gradeQ275

C(％)	Si(％)	Mn(％)	P(％)	S(％)	Cr(％)	Ni(％)	Cu(%)
0.28～0.38	≤0.35	0.50～0.80	≤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 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)
232(≥)	969(≥)	13	14	22	Solution and Aging,Annealing,Ausaging,Q+T,etc	414

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
424(≥)	565(≥)	42	34	22	Solution and Aging,Annealing,Ausaging,Q+T,etc	332
Temp. °C/°F	Creep strain limit (10000h) (Rp1,0)N/mm2	Creep rupture strength (10000h) (Rp1,0)N/mm2
685	277	935

Q275 Range 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

Equivalent Grade

1 Q275 2 Q275