 |
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| 21-4 N valve steel | 21-12 N valve steel | X45CrSi93 valve steel | SUH3 / SUH11 Heat resisting steel bars |
| |
| Typical Analysis : |
| Grade |
Carbon | Silicon | Manganese | Chromium |
Molybdenum |
Nickel |
| SUH 3 | 0.4% | 2.15% | 0.6% max |
11.0% |
1.0% |
0.6% max |
| SUH 11 | 0.5% |
1.5% |
0.6% max |
8.5% |
- |
0.6% max |
|
| |
| Applications :
|
| The alloys offer very good resistance to heat.Bars used in quenched and tempered condition for good combination of impact and mechanical properties for demanding applications like- Automotive Valves. |
| |
| Typical Mechanical Properties of quenched
and Tempered bars 25mm max dia : |
| Grade |
Proof
Stress
n/mm2 |
UTS n/mm2 |
El% |
RA% |
Charpy
J/cm2 |
BHN |
| SUH3 |
685 |
930 |
15 |
35 |
20 |
269 |
| SUH11 |
685 |
880 |
15 |
35 |
20 |
262 |
|
| |
| Hardness BHN annealed bars: |
| SUH3 |
269 max |
| SUH11 |
269 max |
|
| |
| Heat-treatment : |
| Grade |
Annealing |
Quenching |
Tempering |
| SUH3 |
800-900 °C
Slow cooling |
980-1080 °C
Oil quench |
700-800 °C
Rapid cooling |
| SUH11 |
750-850 °C
Slow cooling |
1000-1050 °C
Oil quench |
650-750 °C
Rapid cooling |
|
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