Steel Suppliers and stockholders - Steel Express

M42 High-Speed Steel

M42 high speed steel is a cobalt molybdenum tools steel, the addition of 8% cobalt means that M42 delivers superior red-hardness when compared to M2. The composition of M42 makes for a good balance of toughness and hardness and can be found widely used for all types of cutting tools, often used for machining materials and super alloys that are difficult to machine. M42 high speed steel has a heat-treated hardness in the range 68 to 70 HRC.

Related Specifications : 1.3247

Applications

M42 is a high-speed steel for conditions that demand excellent hot hardness. M42 is suitable for cutting tools such as, twist drills, broaches, taps, milling cutters, saws, reamers, bandsaw blades and cold work tools.

If the higher red-hardness of M42 if not required for your application then consider M2 high speed steel.

M42 High-speed steel stock

Stockholders and supplier of M42 high speed steel in round, flat and square bar and deliver to the whole of the UK.

Round Bars 1mm – 150mm
Square bar from 4.5mm to 130mm
Flats from 3x7mm to 50 x 380mm

please call with your requirements - 01902 716333

M42 steel properties

Typical chemical composition of AISI M42 High Speed Steel

C

Co

Mo

Cr

V

W

1.08%

8.00%

9.40%

3.90%

1.20%

1.50%

 

Heat treatment of M42 high-speed steel

The following information is provided for guidance only. The rate of heating, cooling and soaking times will vary due to the shape and size of each component and other external factors.

Annealing M42

It is recommended that M42 is annealed after hot working and before re hardening. Heat to 850°C – 900°C at a rate of no more than 220°C per hour. Hold at temperature for a minimum of two hours or one hour per 25mm of thickness. Cool slowly to 700°C.

Stress relieving M42

Heat to 600°C - 700°, soak for approx. 2 hours at temperature, slow cool to 500°C.

Hardening

Hardening M42 high speed steel is carried out in two steps. Pre heat the steel thoroughly to 450°C – 500°C, then increase heat to 1050°C – 1190°C, hold for a short time then quenching to about 550°C. Finally cool in air to hand warm.

Tempering

Temper M42 at between 510-595°C three times for at least 1 hour at full temperature is recommended. Cool in still air to room temperature between tempering treatments.

Tempering M42 high speed Steel

Tempering °C

500

550

600

HRC

67

69

63

 

Forging M42

Pre heat slowly to 650 - 760°C and soak. Increase more quickly to the forging temperature of 1010 - 1150°C and equalise prior to forging. If the temperature drops below 980°C re-heating will be required. Cool the M42 very slowly after forging.

(data sheet & typical analysis available on request).

Call 01902 716333 for nationwide delivery.

Suppliers and stockholder of M42 high-speed steel nationwide throughout the UK

 

Tool Steel

01

A2

D2

D2 Supreme™

D3

H13

M42

M2

P20

• 1.2316

Engineering Steel

EN1A

EN1A LD

EN3B

EN8

EN9

EN14

EN16

EN19

EN24/EN24T

EN36

Alloy24™

Structural Steel

Angles

RHS

CHS

Seamless Tubes

ERW

Flats

Squares

Sheets

Universal Beams

Universal Columns

Channels

T sections

Rounds

Stainless Steel

303

304

316

410

17-4PH

Stainless Steel Sheet

Stainless Steel Bar

Stainless Steel Tube

Cast Iron

Grey cast iron

SG iron

Steel Express

Based in Wolverhampton, West Midlands, Steel Express are steel suppliers and stockholders. Stock is delivered on our own fleet of vehicles locally and nationally quickly and efficiently on the day we say we will.

We also provide a free issue cutting service, press braking, fabrication and forging.

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