UNS S66286, A-286 Ligas resistentes ao calor
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Especificação, Chemical & desempenho mecânico
Ligas resistentes ao calor
UNS S66286 A-286 Alloy
A precipitation hardening stainless steel, UNS S66286 maintains superior strength at high temperatures up to 700℃, surpassing austenitic stainless steels. With a higher nickel content than Type 304, S66286 also includes such elements as titanium and aluminum for hardening. Age hardening is used to precipitate γ' phase [Ni3 (Al, Ti)] making this an extraordinarily strong metal at high temperatures.
soldabilidade
Spot, TIG, MIG and shield metal arc welding can be used on thin S66286 sheets under similar conditions to austenitic stainless steels.
Tratamento térmico
S66286 is a precipitation hardening alloy. Its strength is increased through aging after solution heat treatment. Two stages of heat treatment are generally carried out, as follows:
- Solution heat treatment: 980℃; oil or water cooling
- Age hardening: 720℃ × 16hr; air cooling
After solution heat treatment, either oil or water cooling is required, though air cooling is better for thinner metal. Note that it is important to use a suitable temperature and holding time for aging to obtain the target strength.
Usinabilidade
Compared to standard austenitic stainless steels, S66286 has somewhat superior machining properties. Although a high-speed steel tool can be used, we recommend the use of a sintered carbide tool, and suggest combining a slower feed rate with a greater cutting depth.
Aplicações
S66286 is an excellent choice when high-temperature strength is required such as jet engines, gas turbines and turbo charger components.
