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ASTM A7 Details
ASTM A7 Standard Download
A7 Application:Cold-Work Tool Steel
| Category | Type | Grade | Designations |
|---|---|---|---|
| Grades | Tool Die Steels | A7 | USA - ASTM , |
Chemical composition(wt.%) of A7 grade:
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | 2.00 | 2.85 | ||
| Si | 0.10 | 0.50 | ||
| Mn | 0.20 | 0.80 | ||
| P | - | 0.030 | ||
| S | - | 0.030 | ||
| Cr | 5.00 | 5.75 | ||
| Mo | 0.90 | 1.40 | ||
| V | 3.90 | 5.15 | ||
| W | 0.50 | 1.50 | ||
| Ni＋Cu | - | 0.75 |
Mechanical properties of grade A7
| 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) |
|---|---|---|---|---|---|---|
| 392 (≥) | 439 (≥) | 31 | 43 | 32 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 411 |
Physical properties of grade A7
| 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 |
|---|---|---|---|---|---|---|---|
| 385 (≥) | 513 (≥) | 11 | 44 | 24 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 413 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 349 | 737 | 356 |
A7 - 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 |
|---|---|---|---|
| A 771 S38660 | SAE | USA | Seamless Austenitic and Martensitic Stainless Steel Tubing for Liquid Metal-Cooled Reactor Core Components |
| A 826 S38660 | SAE | USA | Seamless Austenitic and Martensitic Stainless Steel Duct Tubes for Liquid Metal-Cooled Reactor Core Components |
| A 831 S38660 | SAE | USA | Austenitic and Martensitic Stainless Steel Bars, Billets, and Forgings for Liquid Metal Cooled Reactor Core Components |
| S38660 | AISI | USA | Austenitic Chromium Nickel Molybdenum Stainless Steel-Reactor Grade |
| A7 | ASTM | USA | Cold-Work Tool Steel |
| A723 | AISI | USA | Heat treatable low alloyed NiCrMo steel |
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