Chromium Nickel Steels Not Hardenable by Heat Treating Table Chart

Engineering Materials
Applications & Design

The following table chart lists chromium nickel steel that is not hardenable by heat treating.

The term hardened steel or heat trweated steel is often used for a medium or high carbon steel that has been given the heat treatments of quenching followed by tempering . The quenching results in the formation of metastable martensite , the fraction of which is reduced to the desired amount during tempering.

Depending on the temperature and composition of the steel, it can be hardened or softened. In order to make steel harder, it must be heated to very high temperatures. The final result of exactly how hard the steel will be depends on the amount of carbon present in the metal. Only steel that is high in carbon can be hardened and tempered. If a metal does not contain the necessary quantity of carbon, then its crystalline structure cannot be broken, and therefore the physical makeup of the steel cannot be altered.

Many times the term hardening steel will be associated with tempered steel . Both processes are used hand in hand when hardening steel. The two part process begins with hardening the steel so that it becomes tough and will not wear over time. However, many times this process leaves the steel very brittle and susceptible to breaking during use. Tempering reduces the hardness of the forged steel very slightly but improves the overall product as it results in steel that is much less brittle.

Chromium Nickel Steel Not Hardenable by Heat Treatment Table CHart
UNS
Designation
AISI
Treatment
Normalizing
Temp F
Annealing1
Temp F
Hardening
Temp F
Quenching
Medium
 
Temper
S20100
201
1
-
1850-2050
-
Water or Air
-
S20200
202
1
-
1850-2050
-
Water or Air
-
S30100
301
1
-
1800-2100
-
Water or Air
-
S30200
302
1
-
1800-2100
-
Water or Air
-
S30300
303
1
-
1800-2100
-
Water or Air
-
S30400
304
1
-
1800-2100
-
Water or Air
-
S30500
305
1
-
1800-2100
-
Water or Air
-
S30900
309
1
-
1800-2100
-
Water or Air
-
S31000
310
1
-
1800-2100
-
Water or Air
-
S31600
316
1
-
1800-2100
-
Water or Air
-
S31700
317
1
-
1800-2100
-
Water or Air
-
S32100
321
1
-
1800-2100
-
Water or Air
-
N08330
330
1
-
2050-2250
-
Air
-
S34700
347
1
-
1800-2100
 
Water or Air
-
  1. Quench to produce full austenitic structure using water or air in accordance with thickness of section. Annealing temperatures given cover process and full annealing as already established and used by industry, the lower end of the range being used for process annealing.

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