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Subject on This Issue:
* Steels & Properties
* Heat Treatment


Picture
 

EFFECTS OF COOLING MEDIUM

Heat Transfer Coefficient of cooling medium

Medium

No

Cooling Medium
 and Parameters

Heat Exchange
Coefficient (w/m2k)

Remark

Air

1

Undisturbed air

50 – 80

 

 

Nitrogen

1

1 bar, forced

100 – 150

 

2

6 bar, forced

300 – 400

 

3

10 bar, forced

400 – 500

 

 

Helium

1

6 bar, forced

400 – 500

 

2

10 bar, forced

550 – 600

 

3

20 bar, forced

1000

 

 

Hydrogen

1

10 bar, forced

750

 

2

20 bar, forced

1300

 

3

40 bar, forced

2200

 

 

Salt

1

Quench salt 80˚C, still

600 - 900

 

2

Quench salt 80˚C, forced

1000-1300

 

Oil

1

Quench oil 20˚C, 80˚C, still

1000 – 1500

 

2

Quench oil 20˚C, 80˚C, forced

1800 – 2200

 

Polymer

1

Quench polymer 50˚C, still

1700 - 2500

 

2

Quench polymer 50˚C, forced

2800 - 3500

 

 

Water

1

Water 15˚C, 25˚C, forced

3000 - 3800

 

2

Brine 15˚C, 25˚C, forced

 

 

Influencing factors: 1. Medium            2. Thickness            3. Agitation
                             4. Temperature

 
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