Semi-high speed steel

Semi-high speed steel

Steel name: Semi-high speed steel
Table No.: 1724
Chemical composition in weight %: 1.10-1.20% C, 0.80-1.00% Si, 0.30-0.50% Mn, max. 0.030% P, max. 0.030% P, 8.00-9.00% Cr, 1.40-1.60% Mo, 1.90-2.00% V, 1.40-1.60% W
Steel group: High speed steels
Properties: No data
Applications: Steel is a superior semi-high speed steel used extensively for solid machine knife application and cold working applications in place of established high speed grades.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: Preheat to 1500 F-1550 F, soak until evenly heated and transfer or raise furnace temperature to 1850 F-1950 F, holding for no more than 20 minutes at heat regardless of cross section. Then cool in still air.
Tempering: Temper immediately following quenching, prior to the part cooling to below 150 F. Hold parts a minimum of 2 hours per inch of thickness. Triple tempering is recommended. A deep cryogenic treatment may be substituted for the middle of second temper. The adjacent tempering table may be used as a guide. However, since the 1/2” diameter specimens were used for this test, it may be found that heavier sections are several points lower.

Table Tempering Temperature (F) - Hardness (HRC)

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