Cryogenic Treatment

Cryogenic Society of America defines the “cryogenic temperatures“ as temperatures below  - 140°C. 

Goal of this process is to proceed with martensitic transformation by decreasing the temperature and by so reducing the amount of retained austenite.

Alper Heat Treatment  can carry out this process with full control and excellent  precisionin microprocessor operated cryogenic chambers.

 

 

 

Effectsof CryogenicProcess

 

• Retained austenite transforms into martensite

• Very fine η-carbides(etacarbide) precipitate on the  martensitic matrix uniformly

• Arranges hardness  range/distrubition

• Relieves internal stresses/residual stresses

• Increases toughness, wear resistance and  fatigue strength

 

STEELS DIN 1.2080 DIN 1.2379 DIN 1.2436
HARDNESS AFTER QUENCH 64 HRC 63 HRC 64 HRC
STRESS RELIEVED (150°C) 62HRC 61-62 HRC 62-63 HRC
CRYOGENIC PROCESS  (-150°C / 12 Hours) 66-67 HRC 63-64 HRC 65-66 HRC

 

Increase of Wear Life in Cryogenic Treated Steels.

 

STEEL

WearResistance(Rw*)

No Process

Sub-ZeroTreat.

CryogenicTreat.

52100

25.2

49.3

135

D2 (1.2379)

224

308

878

A2 (1.2363)

85.6

174.9

565

M2 (1.3343)

1961

2308

3993

O1 (1.2510)

237

382

996

 

A standart cryogenic process cycle:

a: time to reach process temperature from room temperature.

b: holding time at process temperature

c: time to reach room temperature

d: temperin temperature

 

Alper Heat Treatment  can carry out this process with full control and excellent precision in microprocessor operated cryogenic chambers which are also manufactured by Alper.