A-10 Graph-Air®  Annealed

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PACIFIC A10 contains graphite particles distributed throughout the microstructure which gives it excellent machinability and good anti-seizing characteristics. Because of hardening from low temperature (1450/1500°F), its size change and distortion characteristics are both very low. A10 is perhaps the most stable of all tool steels through heat treatment.

Chemical Composition

Heat Analysis - ranges and limits %

C

1.35

Mn

1.80

Si

1.25

Mo

1.50

Ni

1.80

Forging:

Preheat at 1200/1250°F before raising to 1800/1925°F forging temperature. Do not forge below 1600°F.

Annealing:

Heat slowly and uniformly to 1410/1460°F and soak before cooling at a maximum rate of 15°F per hour to 950°F (cooling rate below 950°F is not critical). Typical annealed hardness is 235/269 HB.

Stress Relieving:

Heat to 1200/1250°F and hold 1 hour minimum at temperature; cool in air.

Hardening:

Preheat at 1200/1250°F before raising to an austenitizing temperature of 1450/1500°F; hold at temperature 30 to 60 minutes. Cool in air (to 80/90°F for maximum hardness); typical as quenched hardness is 62/64 HRC.

Temperting (Drawing):

Temper immediately at 350/800°F to an approximate hardness range of 62 to 55 HRC. Double tempering is suggested with cooling to room temperature between tempers.

Tempering Temperature °F

Approximate Hardness, HRC

300

61

400

60

500

59

600

58

700

57

800

55

900

53

1000

48

1100

41

1200

46

Shapes and Conditions Available
  • ​Annealed Rounds through 6" Diameter

  • SE® Flats & Squares from 1/2" through 3" Thickness