Rolled Alloys - Over 67 years in the Thermal Processing Industry

Rolled Alloys has been committed to servicing the needs of thermal processing industries for 67 years, by being a reliable source of RA330®. RA330® is a wrought alloy that can handle high temperature carburizing conditions and repeated quenching. Most commercial heat treaters are using RA330® in some form in their facilities.  In fact, RA330® is the most widely used wrought alloy by commercial heat treaters.  It remains so widely used because of its versatility and ready availability. 

  • Key features of RA330® include:
  • Oxidation resistance up to 2100°F
  • Usable creep strength to just over 1800°F
  • Used to temperatures of 2100 and more by using stiffeners, braces, or ceramic supports
  • Resistance to carburization and nitriding
  • Sufficient nickel to prevent sigma phase formation
  • Good thermal shock resistance (can be quenched and heated many times)
  • Most common uses include fixtures and trays, baskets, muffles, shaker hearths, repairs to muffles and furnaces

We understand that although RA330 has great features, it may not always be the right choice for all applications. Rolled Alloys has an extensive inventory of alloys. Below we discuss other heat resistant alloys that may be useful for your type of application.

RA 602 CA® is an alloy developed specifically for the highest temperature process, where strength and resistance to atmospheres are required. This alloy has demonstrated:

  • Oxidation resistance up to 2250°F
  • Usable creep strength as high as 2300°F (with limitations) in vacuum and 2250° in air
  • Resistant to carburization and nitriding
  • Immune to sigma phase formation
  • Best uses include very high temperature muffles, rotary calciners, fixtures up to 2300°F in vacuum, radiant tubes for carburizing furnaces with high C potentials, fixtures, and cast belt furnace pins.

While there are other alloys used to the same extreme temperatures, their performance does not match RA 602 CA®. In most applications, over the entire life cycle of an RA 602 CA®, especially at the highest temperatures, RA 602 CA® is more economical, but it may take years to realize these savings, which are very significant, if one can wait.


RA 253 MA® is a stainless steel with some very useful applications.  Features include:

  • Oxidation resistance up to 2000°F
  • Usable creep strength up to 2000°F
  • Being a stainless steel it is not resistant to carburization or nitriding
  • It will precipitate sigma phase limiting it to use of 1600°F and higher
  • Thermal shock resistance is inferior to RA330 especially in water
  • Oxidation resistance is lowered by steam
  • This alloy is used for salt pots, fixturing, furnace belts

RA253MA was developed to meet the need for a heat resistant stainless steel with high strength while maintaining good oxidation resistance in the heat treat industry. RA253MA is a lean austenitic stainless steel which makes it cost effective and stable in environments where oxidation, sulfidation, and erosion may be expected. RA253MA is very economical compared to most heat resistant alloys.

In addition, Rolled Alloys has inventory in 309, 310, 600, and Alloy X. For more information on these grades please visit the alloy page on our website If you have technical or application questions please contact the Rolled Alloys Metallurgical Services group at