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| Category | Type | Steel grade | Country |
|---|---|---|---|
| Grades | Special Alloy | Q275 | China |
Chemical composition % of the ladle analysis of grade Q275
| 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
| 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) |
|---|---|---|---|---|---|---|
| 836 (≥) | 976 (≥) | 11 | 33 | 11 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 312 |
| 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 |
|---|---|---|---|---|---|---|---|
| 498 (≥) | 774 (≥) | 31 | 34 | 43 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 221 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 347 | 313 | 461 |
| 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 |