W.NR. 1.3343

Main characteristics and applications

For all metal-cutting tools for roughing or finishing such as twist drills, diverse milling cutters, thread dies, broaches, reamers, countersinks, thread chasers, circular saw segments, shaping tools and woodworking tools. Also highly suitable for cold-forming tools such as cold extrusion rams and dies, as well as cutting and precision cutting tools, plastic moulds with elevated wear resistance and screws.

Comparable standards

S 6-5-21.3343Z85WDCV06-05-04-02M-2SKH51

Chemical composition (typical; in weight %)

CSi (max)Mn (max)P (max)S (max)CoCrMoVW

Physical properties (reference values)

Thermal conductivity at °C (W/mk)32.823.525.5

Steel properties

Standard high-speed steel grade. Its well-balanced alloy composition forms the basis of its high toughness and good cutting edge retention, rendering it suitable for a large variety of applications.

Heat treatment

AnnealingHeat to 770 – 860 °CFurnacemax. 269
Stress-relief annealing °CHeat to 630 – 650 °CFurnace-
1st pre-heating °C2nd and 3rd pre-heating °C Hardening1 °CQuenchingTempering °CQuenching
up to approx. 400 in an air-circulating furnacea) 8501190 – 1230a) Saltbath, 550 °Cat least twice 530 – 56064 – 66
-b) 850 and 1050-b) Oil--
---c) Air--

For cold-forming tools with a complex geometry, a hardening temperature at the lower end of the quoted range is recommended. The stated hardening temperatures apply to saltbath hardening only. For vacuum hardening, we suggest a reduction of 10 °C to 30 °C.

Isothermal time temperature transformation diagram


Tempering diagram


Tool and Die Steel Includes Cold Work Steel, Hot Work Steel, Plastic Mould Steel, High Speed Steel. These tool materials adhere to great quality demands of steel like temper, strength, toughness, resistance to tempering, hardening capacity, dimensional stability etc. The range of Tool Steel in our store includes products from renowned manufacturers.