One-stop 21-4n Valve Steel Factory in China
After several years of development, Sichuan Liaofu Special Steel Industry Co., Ltd mainly produce die steel, alloy steel,high speed steel and Valve steel.
21-4n gas Valve Steel
21-4n is a nitrogen-strengthened, austenitic valve steel. The steel suitable for the manufacture of various valves is also called gas valve steel. 21-4n gas valve steel Increase the carbon content and add nickel, molybdenum, tungsten, vanadium, etc., can improve the heat resistance. Carbon content up to 0.80%~0.85%. 21-4n gas valve steel is used as an exhaust valve for automotive engines and diesel engines operating below 540ºC(1000ºF)
Chemical Composition
The following table shows the chemical composition of super alloy 21-4N valve steel.
| Elements | Content (%) |
|---|---|
| Chromium, Cr | 21 |
| Manganese, Mn | 9 |
| Nickel, Ni | 3.88 |
| Carbon, C | 0.53 |
| Silicon, Si | 0.25 max |
Physical Properties
The physical properties of super alloy 21-4N valve steel are given in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 7.7 g/cm³ | 0.278 lb/in³ |
Mechanical Properties
The mechanical properties of super alloy 21-4N valve steel are displayed in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 950-1200 MPa | 13778-17404 psi |
| Modulus of elasticity | 215 GPa | 31183 ksi |
| Elongation | 8% | 8% |
| Reduction | 10% | 10% |
| Hardness | 32 | 32 |
International Standards of Valve Steels
| DIN | W.Nr | BS | JIS | SEA | IS |
| X4SCS9-3 | 1.4718 | EN-52 | SUH-1 | HNV-3 | X45C9513 |
| - | - | - | SUH-11 | - | X50Cr9SI2 |
| X40CSIMo10-2 | 1 4731 | - | SUH-3 | HNV-1 | X40r115i2Mo1 |
| X85CrMoV18-2 | 1.4748 | - | - | - | - |
| X55CrMnNiN20-8 | 1 4875 | 21-2N | - | EV12 | XC2IMn6NEN |
| X53CMnNiN21-9 | 1.4871 | 21- 4N | SUH-35 | EV 8 | X53C22Mn9Ni4N |
| - | - | 21-12N | SUH-37 | EV-4 | X20C21Ni12N |
| X50CrMnNiNbN21-9| | 1 4882 | 21-43N | - | - | - |
| X33CrNiMnN23-B | 1 4866 | 23-8N | EV16 | X3C32N8MmN | |
| NCr16FeTTAI | 2.4694 | - | SUH-751 | j-775 | - |
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