Mat.No. 1.3202, DIN S12-1-4-5, AISI T15

Designation by Standards

Chemical Composition (in weight %)

Description
High performance high-speed tungsten steel. The high V content gives the steel the best cutting performance and durability. The Co content offers high tempering durability and hot hardness. The steel has proved particularly beneficial in cases where hard materials being processed cause a high degree of wear of the cutting surface, and where the cutting surface is at an elevated temperature. 

Applications
High speed steel, for heavy-duty operations. Turning knives, milling cutters for rough machining, smoothing. 

Physical properties (avarage values) at ambient temperature
Modulus of elasticity [10³ x N/mm²]: 217 
Density [g/cm³]: 8.40
Thermal conductivity [W/m.K]: 19.0 
Electric resistivity [Ohm mm²/m]: 0.65
Specific heat capacity[J/g.K]: 0.46

Coefficient of Linear Thermal Expansion 10^-6 oC^-1

Soft Annealing
Heat to 820-860^oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 280.

Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to 600-650^oC, holding for one hour at heat, followed by air cooling. This operation is performed to reduce distortion during heat treatment.

Hardening
1st pre-heating: 400^oC. 2nd and 3rd pre-heating: 850^oC and 850^oC and 1050^oC. Harden from a temperature of 1190-1240^oC followed by oil or air quenching or warm bath approx. 550^oC/air. 

Tempering
Tempering temperature: 3 x at 540-580^oC. Hardness after tempering is 65-67 HRC.

Tempering Diagram

Click the image to enlarge the diagram.

Forging
Hot forming temperature: 1100-900^oC. 

Machinability
No data.

Corrosion Resistance 
Corrosion resistance of this alloy is better than that of plain carbon steels. However it will rust unless given protective treatment.

Forms manufactured: Please see the Dimensional Sales Program.