M35 HIGH SPEED STEEL (1.3243)

Material available in round and flat sections

M35 High Speed Steel (1.3243) is a conventionally manufactured cobalt alloyed high-speed steel. The various stages of the manufacturing process are chosen and controlled so that an end product is obtained with a good structure in terms of carbide size and distribution. This is a distinct advantage for the finished M35 High Speed Steel (1.3243).

M35 is characterised by:

Applications

M35 is a high-speed steel suitable for cutting tools such as, broaches, taps, milling, reamers, hobs, shapers cutters, saws etc. In terms of performance, M35 is an all-round steel to be used in cutting conditions where demands for hot hardness are of importance. M35 is also suitable for cold work applications, where exacting demands are imposed on wear resistance. The steel possesses an admirable combination of wear resistance and toughness and in these respects superior to the high alloyed cold work steels.

For use on:

Physical Properties

Temperature	20°C	400°C	600°C
Density g/cm3	8.1	8.0	8.0
Modulus of elasticity kN/mm²	230	205	184
Thermal expansion ratio per °C	-	11.6x10 -6	11.9x10 -6
Thermal conductivity W/m°C	24	28	27
Speciﬁc heat J/kg°C	420	510	600

4-Point Bend Strength

Hardening temperature in °C
Tempering 2 x 1 hour at 560°C
Dimension of test piece Ø 4.7 mm

Rmb = Ultimate bend strength in kN/mm²

Reb = Bend yield strength in kN/mm²

Tot. work = Total work in Nm

Heat Treatment

Soft annealing in a protective atmosphere at 850-900°C for 3 hours, followed by slow cooling 10°C perhour down to 700°C, then air cooling.
Stress-relieving at 600°C to 700°C for approximately 2 hours, slow cooling down to 500°C.
Hardening in a protective atmosphere with pre-heating in 2 steps at 450-500°C and 850-900°C and austenitising at a temperature suitable for chosen working hardness.
Tempering at 560°C twice for at least 1 hour each time.

Surface Treatment

The steel grade is a perfect substrate material for PVD coating. If nitriding is requested, a small diffusion zone is recommended but avoid compound and oxidized layers.

Guidelines For Hardening

Tempering temperature in °C Hardness after hardening, quenching and tempering 2 x 1 hour

Tool	Hardening	Tempering
Single-edge cutting tools	1220°C	560°C
Multi-edge cutting tools	1180-1220°C	550-570°C
Cold work tools	1050-1150°C	550-570°C

We supply a comprehensive range of special steel products.

Whether you need tool steels, conventional high-speed steels, or powder metallurgy grades, our friendly team is ready to help meet your requirements. We cut and supply steel products for our customers, across the UK and Ireland, and specialise in niche products as well as standard commercial grades.