This standard specifies the alloy steel, low alloy steel, alloy steel chemical composition relative to the provisions of the finished steel smelting chemical composition boundary limit allowable deviation, and gives the definition of related terms.
| Elements | Min.（≥） | Max.（≤） | Similar | Remarks |
|---|---|---|---|---|
| C | 0.05 | 0.11 | ||
| Si | - | 0.03 | ||
| Mn | 0.25 | 0.5 | ||
| P | - | 0.035 | ||
| S | - | 0.035 | ||
| Cr | - | 0.1 | ||
| Ni | - | 0.3 | ||
| Cu | - | 0.25 |
Delivery status: hot or hot forging
This standard specifies the alloy steel, low alloy steel, alloy steel chemical composition relative to the provisions of the finished steel smelting chemical composition boundary limit allowable deviation, and gives the definition of related terms.
| ReL (MPa) | Rm (MPa) | Z (%) | A5.65 (%) | Heat treatment condition | Technology | Sampl |
|---|---|---|---|---|---|---|
| 175(≥) | 295(≥) | 60(≥) | 35(≥) | Normalizing | 930℃ Heat preservation≥30min AC Normalizing | 25(Sampl size) |
| 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) |
|---|---|---|---|---|---|---|
| 261 (≥) | 881 (≥) | 34 | 44 | 21 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 314 |
| 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 |
|---|---|---|---|---|---|---|---|
| 686 (≥) | 251 (≥) | 31 | 13 | 13 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 333 | |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
|||||
| 738 | 382 | 725 |
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