S5 Tool Steel

Chemical Analysis:

Carbon

.50/.65

Manganese .60/1.00
Phosphorus .030 Max.
Sulfur .030 Max.
Silicon .175/2.25
Chromium .035 Max.
Vanadium .035 Max.
Tungsten -------
Molybdenum -------
Cobalt -------
Tempering Temp. º(F): Hardness Rc
As-quenched 65.0
300 63.0
400 61.0
500 60.5
600 59.0
700 57.5
800 53.0
900 51.0
1000 49.0
1100 47.0
1200 40.5
1300 33.5

Uses:

Shear blades, Veneer knife, punches, dies, pneumatic tools, chisels, beading tools, caulking tools.

Forging/Rolling:

Heat slowly to 1850° F - 1950° F and hold for uniformity. Do not forge or roll below 1650° F, cool slowly from the forging or rolling temperature.  Do not normalize.

Annealing:

Heat slowly to 1400° F, and hold for 1 hour per inch of thickness.  Cool slowly to 1000° F; air cool to room temperature.  Expect Brinell hardness 229 max.

Hardening:

Heat to 1600° F and hold for uniformity, not to exceed 1/2 hour per inch of thickness.  Quench into 150° F oil.

Tempering:

Temper immediately after quenching, before part has cooled to below 150° F.  Parts should be held a minimum of 2 hours per inch of greatest thickness.  A single temper is sufficient.  Tempering temperatures should be between 400° F - 650° F.  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.