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Steel Making

Corrosion
This steel like any other steel when distorted by cold worki...

Optical System And Electrical Circuit Of The Leeds & Northrup Optical Pyrometer
For extremely high temperature, the optical pyrometer is lar...

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Pyrometers
Armor plate makers sometimes use the copper ball or Siemens' ...

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

Ebbw Vale And The Bessemer Process
After his British Association address in August 1856, Besseme...

Heat Treatment Of Steel
Heat treatment consists in heating and cooling metal at defin...

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

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

Surface Carburizing
Carburizing, commonly called case-hardening, is the art of pr...

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

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

Crankshaft
The crankshaft was the most highly stressed part of the entir...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

Sulphur
Sulphur is another impurity and high sulphur is even a greate...

Vanadium
Vanadium has a very marked effect upon alloy steels rich in c...

Tungsten
Tungsten, as an alloy in steel, has been known and used for a...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...



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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