AISI 6140 & 6145

AISI / Alloy Steel 6140 & 6145

Chemical Analysis 6145
C% Carbon
0.35 – 0.45
Mn% Manganese
0.60 – 0.90
P% Phosphorus
0.040 max
S% Sulfur
0.040 max
Si% Silicon
0.20 – 0.35
Cr% Chromium
0.80 – 1.10
V% Vanadium
0.15 min
Chemical Analysis 6140
C% Carbon
0.43 – 0.48
Mn% Manganese
0.70 – 0.90
P% Phosphorus
0.040 max
S% Sulfur
0.040 max
Si% Silicon
0.20 – 0.35
Cr% Chromium
0.80 – 1.10
V% Vanadium
0.15 min

General characteristics of Alloy Steel 6140 & 6145

These two alloys belong in the same family as 6150. They are both chromium-bearing types with a small vanadium addition.

Applications

These alloys are of a slightly lower strength level than type 6150 and both have in fact been superceded by it. They could be used in the same applications as 6150, namely as forged parts in automotive engineering and gear and engine construction.

Forging

These alloys would be forged between 2150 and 1700ºF (1175 and 925ºC.) The alloys should be slow cooled after forging or transferred to a furnace around the ‘finishing’ temperature.

Heat treatment

Annealing: As with 6150 alloy, the microstructure for these alloys to give optimum machinability is one of coarse lamellar pearlite to coarse spheroidite. This might be obtained by austenitizing at around 1380ºF (760ºC) followed by an iso anneal at 1250ºF (680ºC.)

Normalizing:A nominal normalizing temperature for this alloy is 1650ºF (900ºC.) This treatment is followed by air cooling.

Hardening:Austenitize at 1575-1650ºF (860-900ºC) and oil quench for small, intricate sections and water quench for large, simple sections.

Tempering:at a temperature that will give the required mechanical properties, based on past experience.

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