 |
 |
| 21-4 N valve steel | 21-12 N valve steel | X45CrSi93 valve steel | SUH3 / SUH11 Heat resisting steel bars |
| |
| Typical Analysis : |
| Carbon |
0.45% |
Manganese |
0.50% |
Silicon |
3.25% |
Chromium |
8.50% |
|
| |
| Applications :
|
| This alloy offers good resistance to oxidation and corrosion by combustion products of gasoline engines where the operating temperature is below 1000 °F (538 °C). It has been widely used for intake valves and exhaust valve stems in internal combustion engines. |
| |
| Workability :
|
Forging : X45CrSi93 (SIL No. 1) can be readily forged by both upset and extrusion
methods at temperatures in the range of 1900 / 2100 °F (1038 / 1149
°C). Forgings should be slow cooled from forging heat.
Machinability : Machinability properties are comparable to the standard 18-8 stainless alloys but more difficult than SAE 3140. |
| |
| Heat Treatment : |
Full Anneal : Heat to 1400 / 1450 °F (760 / 788 °C), and air or water quench. This will result in a hardness of 27 / 29 Rockwell C.
Hardening : Heat to 1850 / 1925 °F (1010 / 1052 °C) and oil quench. Rockwell hardness C 60 / 62.
|
| Tempering Temperature |
Rockwell C Hardness |
| °F |
°C |
| 600 |
316
|
58 |
| 800 |
427 |
58 |
| 900 |
482 |
57 |
| 1000 |
538 |
53 |
| 1100 |
593 |
43 |
| 1200 |
649 |
37 |
| 1300 |
704 |
34 |
|
| |
| Typical Mechanical Properties : |
| Temperature Mechanical Properties |
| Specimen treated 1450 °F (788 °C), water quenched |
|
Test Temperature |
0.2% Yield Strength |
Ultimate Tensile Strength |
% Elongation in 4 D |
% Reduction Of Area |
Brinell Hardness |
V-Notch Charpy Impact |
|
°F |
°C |
Ksi |
Mpa |
Ksi |
Mpa |
Ft-Ib |
J |
|
77 |
25 |
82.5 |
569 |
133.0 |
917 |
22.5 |
49.0 |
269 |
2 |
2.9 |
|
1000 |
538 |
53.0 |
365 |
67.5 |
465 |
40.5 |
71.0 |
125 |
60 |
81.3 |
|
1100 |
593 |
29.5 |
203 |
43.5 |
300 |
38.0 |
85.0 |
85 |
75 |
101.9 |
|
1200 |
649 |
15.0 |
103 |
31.0 |
214 |
73.5 |
92.5 |
45 |
95 |
128.4 |
|
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