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UNS T20821 Details
UNS T20821 Standard Download
T20821 Application:Hot-Work Tool Steel
| Category | Type | Grade | Designations |
|---|---|---|---|
| Grades | Tool Die Steels | T20821 | USA - UNS , |
Chemical composition(wt.%) of T20821 grade:
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | 0.26 | 0.36 | ||
| Si | 0.15 | 0.50 | ||
| Mn | 0.15 | 0.40 | ||
| P | - | 0.030 | ||
| S | - | 0.030 | ||
| Cr | 3.00 | 3.75 | ||
| Mo | - | - | ||
| V | 0.30 | 0.60 | ||
| W | 8.50 | 10.00 | ||
| Ni＋Cu | - | 0.75 |
Mechanical properties of grade T20821
| 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) |
|---|---|---|---|---|---|---|
| 983 (≥) | 654 (≥) | 44 | 24 | 11 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 412 |
Physical properties of grade T20821
| 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 |
|---|---|---|---|---|---|---|---|
| 624 (≥) | 911 (≥) | 32 | 12 | 24 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 141 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 726 | 814 | 338 |
T20821 - Form of Supply
| 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 |
Cross Reference Table(Equivalent Grade)
| Grade | Standard | Country | Application |
|---|---|---|---|
| T20821 | UNS | USA | Hot-Work Tool Steel |
| T20821 | UNS | USA | Hot-Work Tool Steel |
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