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| 21-4 N valve steel | 21-12 N valve steel | X45CrSi93 valve steel | SUH3 / SUH11 Heat resisting steel bars |
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| Typical Analysis : |
| Carbon |
0.48/0.58% |
Manganese |
8.0/10.0% |
Silicon |
0.25% max |
| Chromium |
20.0/23.0% |
Phosphorus |
0.050% max |
Sulfur |
0.035% max |
| Nitrogen |
0.38/0.55% |
Iron |
Balance |
Nickel |
3.25/4.50% |
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| Applications :
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| This alloy has been used primarily in exhaust valves and the head portion of two piece valves. |
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| Workability :
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| Forging : 21-4 N can be readily forged by both upset and extrusion methods at temperatures in the range of 2050 / 2150 °F (1121 / 1177 °C). Do not forge above 2200 °F (1204 °C) or below 1800 °F (982 °C). Forgings can be rapidly cooled. |
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| Heat Treatment : |
Solution Heat Treatment : Heat approximately for 1 hour at 2125 °F (1163 °C), and cool rapidly.
Solution Treated and Aged : Heat to 2125 °F (1163 °C), hold for 1 hour followed by water quench. After complete cooling, heat to 1400 °F (760 °C), hold for 16 hours followed by air cooling. |
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| Typical Mechanical Properties : |
| Heat Treatment : 2150 F (1177C) / 1hr / WQ + 1400 F (760 C) / 16hr / AC |
| Test Temperature |
0.2% Yield Strength |
Ultimate Tensile Strength |
% Elongation |
% Reduction Of Area |
Hardness |
| °F |
°C |
Ksi |
MPa |
Ksi |
Mpa |
| Room |
Room |
100.7 |
694 |
168.0 |
1158 |
10.7 |
10.8 |
37 HRC |
| 1400 |
760 |
44.9 |
310 |
63.9 |
441 |
31.2 |
39.3 |
77 HRB |
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| Hot Tensile Impact Test : |
| Heat Treatment : 2150 degree F (1177 degree C) / 1hr / WQ + 1400 degree F (760 degree C) / 16hr / AC |
| Test Temperature |
% Impact Strength |
% Impact Elongation |
% Impact Reduction of Area |
| °F |
°C |
Ft-Ib |
| 1940 |
1060 |
117 |
49.6 |
71.0 |
| 2100 |
1149 |
98 |
50.5 |
72.7 |
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| Creep Test Data : |
| 1350 degree F (732 degree C). Heat Treatment : 2150 degree F (1177 degree C) / 1hr / WQ + 1400 degree F (760 degree C) / 16hrs/ AC |
| Stress |
ASTM Grain
Size |
Time for the Indicated Total Deformation (hrs.) |
Calculated Stress to Produce 1% Creep in 100 hrs. |
| Ksi |
Mpa |
0.5% |
1.0% |
Ksi |
Mpa |
| 25 |
172.0 |
4 |
3.5 |
20.0 |
18 |
124 |
| 20 |
138.0 |
4 |
4.5 |
25.0 |
- |
- |
| 10 |
689.0 |
4 |
450.0 |
1850.0 |
- |
- |
|
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| Brinell Hardness vs. Temperature : |
| Heat treatment : 2150 degree F (1177 degree C) / 1hr. / WQ + 1400 degree F (760degree C) /16hrs. / AC |
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