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| Category | Type | Steel grade | Standard | Country |
|---|---|---|---|---|
| Grades | Special Alloy | K438 | GBT | China |
Chemical composition%of the ladle analysis of gradeK438
| C(％) | Si(％) | Mn(％) | P(％) | S(％) | Cr(％) | Ni(％) | Mo(％) | W(%) | Co(%) | B(%) | Nb(%) | Al(%) | Ti(%) | Ta(%) | Other(%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.10-0.20 | Max 0.5 | Max 0.5 | Max 0.015 | Max 0.01 | 15.5-16.5 | Balance | 1.50-2.00 | 2.40-2.80 | 8.00-9.00 | 0.005-0.015 | 0.50-1.10 | 3.20-3.70 | 3.00-3.50 | 1.50-2.00 | Zr:0.05-0.15 |
| 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) |
|---|---|---|---|---|---|---|
| 512(≥) | 865(≥) | 12 | 32 | 42 | Solution and Aging,Annealing,Ausaging,Q+T,etc | 332 |
| 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 |
|---|---|---|---|---|---|---|---|
| 827(≥) | 355(≥) | 44 | 24 | 13 | Solution and Aging,Annealing,Ausaging,Q+T,etc | 312 | |
| Temp. °C/°F | Creep strain limit (10000h) (Rp1,0)N/mm2 | Creep rupture strength (10000h) (Rp1,0)N/mm2 | |||||
| 646 | 984 | 645 |
| 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 |