S401 Steel

Steel name: S401
Diagram No.: 2170
DIN designation: HS2-91
Mat.No. (Wr.Nr.) designation: ~1.3346
UNS designation: T11301
AISI/SAE designation: M1
UNI designation: HS1-8-1
BS designation: ~ BM1
AFNOR designation: Z85DCWV08-04-02-01
Chemical composition in weight %: 0.84% C, 0.40% Si, 0.30% Mn, 3.80% Cr, 8.60% Mo, 1.20% V, 1.80% W
Steel group: High speed tool steels
Applications: No data
Comment: No data
Reference: Not shown in this demo version.

Heat Treatment
Hardening: 1170 to 1210C (2140 to 2210F) Oil, air, salt bath (500 - 550C (930 - 1020F), gas. Upper temperature range for parts of simple shape, lower for parts of complex shape. For coldworking tools also lower temperatures are of inportance for higher toughness.
Tempering: Slow heating to tempering temperature immediately after hardening/time in furnace: 1 hour for every 20 mm of workpiece thickness, but not less than 2 hours/ air cooling (minimum holding time: 1 hour). 1st tempering and 2nd tempering to desired working hardness. Average obtainable hardness values are shown in the tempering chart. 3rd tempering for stress relieving, 30 - 50C (86-122F) below highest tempering temperature.
Note: No data

Tempering Diagram

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