Typical Analysis :
|Chromium||20.0/23.0%||Phosphorus||0.050% max||Sulfur||0.035% max|
This alloy has been used primarily in exhaust valves and the head portion of two piece valves.
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.
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.
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|
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|
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
|Time for the Indicated Total Deformation (hrs.)||Calculated Stress to Produce 1% Creep in 100 hrs.|
Brinell Hardness vs. Temperature :
Heat treatment : 2150 degree F (1177 degree C) / 1hr. / WQ + 1400 degree F (760degree C) /16hrs. / AC
|Typical Analysis :|
|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.|
|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.
|Typical Mechanical Properties :|
|Temperature Mechanical Properties|
|Specimen treated 1450 °F (788 °C), water quenched|
|Typical Analysis :|
|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 :|
|Hardness BHN annealed bars:|