High Temp Alloy Age Hardening

Cincinnati Steel Treating (CST) has experience heat treating a wide variety of high temperature alloy steels, stainless steels, and tool steels commonly used in high temperature service. CST’s furnaces can reach 1850°F, and parts can be quenched under atmosphere, in air, or in oil. Grades that we have experience with include Inconel 718, 15-5 PH, 17-4 PH, 13-8 PH, D2, A2, H11, H13, 420 stainless steel, and many others. CST is familiar with heat treating these grades to specifications written for the high temp alloy grades, and we have unmatched expertise in straightening long parts that are made out of these materials.

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High Temp Alloy Age Hardening Capabilities

Cincinnati Steel Treating (CST) can heat treat both large and small alloy parts including washers, bolts, shafts, knife blades, and spindles along with many others. The size can vary anywhere from ½ of an inch all the way up to 6” X 200”. These parts can be heat treated in one of seven different atmosphere

furnaces, the dimensions of which are shown in the accompanying table. The furnaces provide a controlled atmosphere that heats up the parts to the proper austenitizing temperature. They can be subsequently quenched in still air, forced air, oil, or possibly water. The typical process can include aging, tempering, or cryogenic treatment. Parts are sometimes withdrawn early from quenching, so that the retained heat can facilitate the straightening process. Our shop can supply the furnaces with nitrogen, carburizing gas (endo gas + methane), or ammonia. This helps to reduce or eliminate oxidation and decarburization on the parts as well as delivering a small jolt of nitrogen into the surface. Let Cincinnati Steel Treating help you decide the best method of heat treating your high temperature alloy steel parts.

Table 1 – Furnaces for Heat Treating High Temperature Alloy Parts

Furnaces	Dimensions	Maximum Weight per load (lbs)
Large Internal Quench	48” X 36” X 72”	3000
Small Internal Quench	30” X 30” X 48”	1600
Pit Furnace # 2	24” diameter X 50” deep	1000
Pit Furnace # 8	18” diameter X 120” deep	1000

Applications of High Temperature Alloy Heat Treating

High temperature alloy parts are very important in industry. They are capable of withstanding a great deal of wear, they retain their strength at elevated temperatures, and they resist corrosion. Examples of high temperature alloy parts include forging dies, knife blades, wear plates, rollers, stamping tools,

furnace fixtures, and turbine blades. A large amount of alloy is used to make these parts, so the material is very expensive. A great number of third-party standards and specifications have been written as a result to govern how these parts are heat treated. Examples include AMS 6488, AMS 2759/11, ASTM A681, ASTM A686, DIN 1.2344, JIS G 4404, and many others. Navigating these standards and specifications can be challenging, so let Cincinnati Steel Treating’s expertise help you choose the best heat treatment for your high temperature alloy part.

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