Stainless Steel 442
| Chemical Analysis | |
|---|---|
| C | Carbon 0.20 max |
| Mn | Manganese 1.00 max |
| P | Phosphorus 0.040 max |
| S | Sulfur 0.030 max |
| Si | Silicon 1.00 max |
| Cr | Chromium 18.00 – 23.00 |
| Mo | Molybdenum 0.15 – 0.25 |
General characteristics of Stainless Steel 442
Type 442 is a ferritic stainless steel with scaling resistance between that shown by type 430 and that shown by type 446.
Applications of Stainless Steel 442
This alloy has good scaling resistance to about 1700/1800ºF (925/980ºC) and may be used for furnace and heat exchanger parts as well as certain parts in steam boilers. High temperature strength of this grade is low, and this should be taken into account when designing for application.
Forging Stainless Steel 442
Stock should be heated to 1500/1600ºF (815/870ºC) then heated to the forging temperature, 1950/2050ºF (1065/1120ºC.) No forging should be carried out below 1600ºF (870ºC.) Forged parts should be air cooled and annealed.
Heat treatment
Annealing
Annealing should be carried out at 1400/1525ºF (760/830ºC) followed by air cooling. Do not soak at, nor slow cool through, the temperature range 700/1000ºF (370/525ºC) to prevent the phenomenon known as 885 embrittlement.
The grade cannot be hardened by heat treatment.
Machinability
This alloy will machine similarly to type 430, with a preference for the use of carbide tooling.
Weldability
Type 442 will weld in a similar manner to type 430, but the higher chromium content may render welds somewhat more brittle. Preheat and post-heat of 300/600ºF (150/315ºC) are helpful.
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