S7 Tool Steel

Chemical Analysis:
Carbon .45/.50
Manganese .20/.80
Phosphorus .030 Max.
Sulfur .030 Max.
Silicon .20/1.00
Chromium 3.00/3.50
Vanadium .35 Max.
Tungsten -------
Molybdenum 1.30/1.80
Cobalt -------
Tempering Temp. º(F): Hardness Rc
As-quenched 60.0
400 58.0
500 56.0
600 55.0
700 54.0
800 53.0
900 52.0
1000 51.0
1100 47.0
1200 38.0
1300 31.0

Uses:

Punches, dies, plastic molds, chisels, gripper dies, engraving dies, bending dies, shear blades, slitter knives, rivet sets.

Forging/Rolling:

Preheat to 1200° F - 1300° F and soak thoroughly.  Then raise to 2000° F - 2050° F.  Do not forge or roll below 1700° F, cool slowly from the forging or rolling temperature.  Do not normalize.

Annealing:

Heat in the 1500° F - 1550° F range, and hold for uniformity.  Furnace cool slowly to 1000° F and air cool.  Expected Brinell hardness 197 max.

Hardening:

Preheat to 1200° F - 1300° F, soak until uniformly heated, and either transfer or raise furnace temperature to 1725° F, and hold 1 hour per inch of greatest thickness.  Sections 2-1/2" or less should be quenched in still air to 150° F.  Section sizes 2-1/2" to 6" can be oil quenched to black, but section sizes over 6" should not be full oil quenched..

Tempering:

Temper immediately after quenching, before parts have cooled to below 150° F.  Parts should always be held a minimum of 2 hours per inch of greatest thickness.  Double tempering is recommended.  For cold work and similar applications a tempering temperature of 400° F - 500° F is suggested and 900° F - 1000° F for hot work applications.  The above tempering table may be used as a guide.  However, since 1/2" dia. specimens were used for this test, it may be found that heavier sections are several points lower.