Stainless Steel 446
| Chemical Analysis | |
|---|---|
| C | Carbon 0.20 max |
| Mn | Manganese 1.50 max |
| P | Phosphorus 0.040 max |
| S | Sulfur 0.030 max |
| Si | Silicon 1.00 max |
| Cr | Chromium 23.00 – 27.00 |
| Ni | Nickel 0.025 max |
General characteristics of Stainless Steel 446
Type 446 is a ferritic stainless steel with scaling resistance up to 2000ºF (1090ºC.)
Applications of Stainless Steel 446
Type 446 is used for furnace parts, oil burners, heat exchangers, kiln liners, glass molds and stationary soot blowers in steam boilers. Type 446 is the only heat-resistant alloy that will tolerate molten copper and brass. The alloy does not, however, have good high-temperature strength. The nitrogen addition is for grain refinement.
Forging Stainless Steel 446
Stock should be uniformly heated to 1500/1600ºF (815/870ºC) then heated to the forging temperature, 2050ºF (1120ºC.) No forging should be carried out below 1650ºF (900ºC.) Forged parts should be air cooled and annealed.
Heat treatment
Annealing
Annealing should be carried out at a temperature of 1400/1525ºF (760/830ºC) followed by air cooling. Again, as with other high chromium steels, avoid soaking at or slow cooling through the temperature range 700/1000ºF (370/525ºC) to prevent embrittlement.
This grade cannot be hardened by heat treatment.
Machinability
This alloy will be expected to machine in the same manner as will type 442, with a preference for the use of carbide tooling.
Weldability
Type 446 will weld using normal fusion and resistance methods, with preheat and post-heat of 300/600ºF (150/315ºC) being helpful. Austenitic filler metals such as 310 or 312 are generally suggested to maximize weld deposit ductility.
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