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Steel Making

Annealing In Bone
Steel and cast iron may both be annealed in granulated bone. ...

The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Heat-treating Equipment And Methods For Mass Production
The heat-treating department of the Brown-Lipe-Chapin Company...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Correction For Cold-junction Errors
The voltage generated by a thermo-couple of an electric pyrom...

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Detrimental Elements
Sulphur and phosphorus are two elements known to be detrimen...

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

Forging High-speed Steel
Heat very slowly and carefully to from 1,800 to 2,000 deg.F....

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

Annealing Method
Forgings which are too hard to machine are put in pots with ...

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

Crucible Steel
Crucible steel is still made by melting material in a clay or...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

Judging The Heat Of Steel
While the use of a pyrometer is of course the only way to hav...



S A E Heat Treatments






Category: HEAT TREATMENT OF STEEL

The Society of Automotive Engineers have adopted certain heat treatments
to suit different steels and varying conditions. These have already
been referred to on pages 39 to 41 in connection with the different
steels used in automobile practice. These treatments are designated
by letter and correspond with the designations in the table.

HEAT TREATMENTS

Heat Treatment A

After forging or machining:
1. Carbonize at a temperature between 1,600 deg.F. and 1,750 deg.F.
(1,650-1,700 deg.F. desired.)
2. Cool slowly or quench.
3. Reheat to 1,450-1,500 deg.F. and quench.

Heat Treatment B

After forging or machining:
1. Carbonize between 1,600 deg.F. and 1,750 deg.F. (1,650-1,700 deg.F.
Desired.)
2. Cool slowly in the carbonizing mixture.
3. Reheat to 1,550-1,625 deg.F.
4. Quench.
5. Reheat to 1,400-1,450 deg.F.
6. Quench.
7. Draw in hot oil at 300 to 450 deg.F., depending upon the degree of
hardness desired.

Heat Treatment D

After forging or machining:
1. Heat to 1,500-1,600 deg.F.
2. Quench.
3. Reheat to 1,450-1,500 deg.F.
4. Quench.
5. Reheat to 600-1,200 deg.F. and cool slowly.

Heat Treatment E

After forging or machining:
1. Heat to 1,500-1,550 deg.F.
2. Cool slowly.
3. Reheat to 1,450-1,500 deg.F.
4. Quench.
5. Reheat to 600-1,200 deg.F. and cool slowly.

Heat Treatment F

After shaping or coiling:
1. Heat to 1,425-1,475 deg.F.
2. Quench in oil.
3. Reheat to 400-900 deg.F., in accordance with temper desired and cool
slowly.

Heat Treatment G

After forging or machining:
1. Carbonize at a temperature between 1,600 deg.F. and 1,750 deg.F.
(1,650-1,700 deg.F. desired).
2. Cool slowly in the carbonizing mixture.
3. Reheat to 1,500-1,550 deg.F.
4. Quench.
5. Reheat to 1,300-1,400 deg.F.
6. Quench.
7. Reheat to 250-500 deg.F. (in accordance with the necessities of the case)
and cool slowly.

Heat Treatment H

After forging or machining:
1. Heat to 1,500-1,600 deg.F.
2. Quench.
3. Reheat to 600-1,200 deg.F. and cool slowly.

Heat Treatment K

After forging or machining:
1. Heat to 1,500-1,550 deg.F.
2. Quench.
3. Reheat to 1,300-1,400 deg.F.
4. Quench.
5. Reheat to 600-1,200 deg.F. and cool slowly.

Heat Treatment L

After forging or machining:
1. Carbonize between 1,600 deg.F. and 1,750 deg.F. (1,650-1,700 deg.F. desired).
2. Cool slowly in the carbonizing mixture.
3. Reheat to 1,400-1,500 deg.F.
4. Quench.
5. Reheat to 1,300-1,400 deg.F.
6. Quench.
7. Reheat to 250-500 deg.F. and cool slowly.

Heat Treatment M

After forging or machining:
1. Heat to 1,450-1,500 deg.F.
2. Quench.
3. Reheat to 500-1.250 deg.F. and cool slowly.

Heat Treatment P

After forging or machining:
1. Heat to 1,450-1,500 deg.F.
2. Quench.
3. Reheat to 1,375-1,450 deg.F. slowly.
4. Quench.
5. Reheat to 500-1,250 deg.F. and cool slowly.

Heat Treatment Q

After forging:
1. Heat to 1,475-1,525 deg.F. (Hold at this temperature one-half hour,
to insure thorough heating.)
2. Cool slowly.
3. Machine.
4. Reheat to 1,375-1,425 deg.F.
5. Quench.
6. Reheat to 250-550 deg.F. and cool slowly.

Heat Treatment R

After forging:
1. Heat to 1,500-1,550 deg.F.
2. Quench in oil.
3. Reheat to 1,200-1,300 deg.F. (Hold at this temperature three hours.)
4. Cool slowly.
5. Machine.
6. Reheat to 1,350-1,450 deg.F.
7. Quench in oil.
8. Reheat to 250-500 deg.F. and cool slowly.

Heat Treatment S

After forging or machining:
1. Carbonize at a temperature between 1,600 and 1,750 deg.F.
(1,650-1,700 deg.F. Desired.)
2. Cool slowly in the carbonizing mixture.
3. Reheat to 1,650-1,750 deg.F.
4. Quench.
5. Reheat to 1,475-1,550 deg.F.
6. Quench.
7. Reheat to 250-550 deg.F. and cool slowly.

Heat Treatment T

After forging or machining:
1. Heat to 1,650-1,750 deg.F.
2. Quench.
3. Reheat to 500-1,300 deg.F. and cool slowly.

Heat Treatment U

After forging:
1. Heat to 1,525-1,600 deg.F. (Hold for about one-half hour.)
2. Cool slowly.
3. Machine.
4. Reheat to 1,650-1,700 deg.F.
5. Quench.
6. Reheat to 350-550 deg.F. and cool slowly.

Heat Treatment V

After forging or machining:
1. Heat to 1,650-1,750 deg.F.
2. Quench.
3. Reheat to 400-1,200 deg.F. and cool slowly.





Next: Restoring Overheated Steel

Previous: Drop Forging Dies



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