The Rolled Alloys Batting Order

You may not know it from the weather, but baseball season has started. At the beginning of every baseball game, the managers meet at home plate to give the umpires their lineups. Here at Rolled Alloys, the heat resistant alloy team packs a powerful lineup. In the heart of the heat resistant batting order, are RA330, RA 602 CA, and RA 253 MA. The rest of the lineup is sprinkled with solid hitters including 600, 601, Alloy X, RA333, 309, and 310. Below is the "press information" about each of the alloys.

At the heart of the order, our power alloys include:

RA330® is an alloy with a typical composition of 35% Ni, 19% Cr, and 1.2% Si, nominally making it a nickel alloy. This alloy is the most economical nickel alloy and versatile. In heat treating, it can be used in most reducing atmospheres, exhibits good oxidation resistant up to 2100°F, and usable creep strength as high as 1850°F. It has excellent thermal fatigue resistance, meaning it will withstand many cycles of heating and quenching.

RA 602 CA® is the most heat resistant alloy in our arsenal. It has superior performance with oxidation resistance up to 2250°F, usable creep resistance to 2300°F, and suitable for most atmospheres. With preoxidation, it has shown some resistance to high temperature sulfidation in some circumstances where the stainless steels no longer have creep strength.

RA 253 MA® is a stainless steel that has excellent oxidation resistance to 2000°F and usable creep resistance up to 2100°F. It is economical for a heat resistant alloy. It offers useful resistance to oxidizing sulfur (SO2). It should not be used in reducing atmospheres.

The position alloys include:

600 has the highest Ni content. It has oxidation resistance and usable creep strength to 2000°F. It has the best resistance to reducing atmospheres, but has a premium price compared to RA330.

601 is the nickel alloy with oxidation resistance and some usable creep strength up to 2200°F. It also has resistance to most reducing atmospheres. It is the most economical alloy with usable strength up to 2200°F, but will be inferior to both RA333 and RA 602 CA at these temperatures.

Alloy X is a nickel alloy with usable creep strength up 1800°F and oxidation resistance up to 2000°F. At temperatures below 1700°F, the creep resistance is much higher than other heat resistant alloys, and might be considered for fixturing and structural parts where RA330 just does not have quite enough creep strength.

RA333® is a nickel alloy with an oxidation limit of 2200°F. It is the best wrought alloy for carbon dusting resistance. It is superior to all alloys except RA 602 CA. It is only available in plate.

309 and 310 are stainless steels with oxidation limits of 1900 and 2000°F respectively, and useful creep resistance to 1800°F max. With relatively low nickel, these two alloys are the often the option of choice for resistance to sulfur bearing environments. They are economical but will offer no resistance to reducing gases used for case hardening surface heat treating.

One should note that all stainless steels are subject to sigma phase embrittlement.