High Speed Steel

M2 high speed steel stockholders and suppliers, delivering to the whole of South India.

Typical applications for M2 high speed steel are twist drills, reamers, broaching tools, taps, milling tools, metal saws. M2 is suitable for cold forming tools such as extrusion rams and dies, also cutting tools, plastic moulds with elevated wear resistance and screws.
Pre heat slowly and uniformly to 850-900°C. The heat should then be increased more quickly to the forging temperature of 1050-1150°C. If during the forging the temperature of the material drops below 880-900°C, re heating will be necessary.
Annealing is recommended after hot working and before re hardening. Heat the M2 high speed steel to 850°C at a rate of no more than 220°C per hour. Always hold at temperature for one hour per 25mm of thickness (with two hours being minimum). Furnace cool slowly.
Pre heat the steel in two steps; 450-500°C then 850-900°C. Then continue heating to the final hardening temperature of 1200-1250°C and ensure that the component is heated through. Care must be taken not to allow the component to remain too long at the hardening temperature. Quench in warm oil or brine. If quenching in brine allow the tools to equalize, then complete the quench in air.
Temper the component immediately after quenching. Heat uniformly and thoroughly to the selected tempering temperature and hold at for at least two hours (one hour per 25mm of total thickness). Double tempering is essential and for tools cut by wire EDM triple tempering is strongly recommended.
Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each M2 steel component.

M42 HIGH SPEED STEEL .Chemical composition
The chemical composition of M42 molybdenum high speed tool steel is outlined in the following table.
ElementsMinMaxCarbon, C0.700.85Manganese, Mn-.--0.40Silicon, Si-.--0.40Molybdenum, Mo----Chromium,Cr3.804.50W17.0019.00V0.801.20Co4.505.50Physical Properties
The table below shows the physical properties of M42 molybdenum high speed tool steel.
PropertiesMetricImperialDensity7.81 g/cm30.282 lb/in3Mechanical Properties PropertiesMetricImperialHardness, Rockwell C (oil quenched from 1204°C, 5 minutes)64.364.3Hardness, Rockwell C (oil quenched from 1177°C, 5 minutes)65.565.5Hardness, Rockwell C(oil quenched from 1163°C)65.865.8Izod impact unnotched (oil quenched at 1191°C; 510°C temper temperature)13.6 J10.0 ft- lbIzod impact unnotched (oil quenched at 1191°C; 622°C temper temperature)24.4 J25.8Machinability (1% carbon steel)35.0 - 40.0%35.0 - 40.0%Poisson's ratio0.27-0.300.27-0.30Elastic modulus190-210 GPa27557-30458 ksiOther Designations

Equivalent materials to M42 molybdenum high speed tool steel are:

• AFNOR 07-05-04-04-02

• DIN 1.3246

• ASTM A600

• FED QQ-T-590

• UNS T11342

• DIN 1.3247

Machinability
M42 tool steel can be drilled, turned, threaded, broached, milled and tapped when it is in its annealed condition and rated at 45% of 1% carbon steel.
Forging
M42 molybdenum high speed tool steel is preheated to 871°C (1599°F) in a slow manner and then soaked. This is followed by rapid heating to 1093°C (1999°F) and slow cooling. Temperatures below 982°C (1799°F) are not suitable for the forging process.
Tempering
M42 tool steel is tempered for three times at 538-593°C (1000-1099°F) and then cooled completely between cycles to obtain good results. Tempering is performed in vacuum furnaces or in salt baths.
Annealing
M42 tool steel is heated at 871°C (1599°F) and then cooled slowly in a furnace.
Hardening
M42 tool steel is preheated to 871°C (1599°F), soaked and finally heated to 1204°C (2199°F)
Quenching
A salt media is used for quenching M42 tool steel at 538°C (1000°F) and then the steel is air cooled.
Heat Treatment
Heat treatment temperatures, including rate of heating, cooling and soaking times will vary due to factors such as the shape and size of each M42 steel component. Other considerations during the heat treatment process include the type of furnace, quenching medium and work piece transfer facilities. Please consult your heat treatment provider for full guidance on heat treatment of high speed steels
Stress Relieving
If tools produced from M42 high speed steel are heavily machined or ground it is recommended to stress relieve after machining and prior to hardening to minimise the possibility of distortion. To stress relieve heat the component to 600-650°C and soak well (approximately two hours) Cool slowly in the furnace. The M42 tools can be finish machined before heat treatment.

M35) 5% Cobalt tool bits are designed for heavy duty machining alloy steels and tough materials, such as castings and forgings. They have high heat and abrasion resistant properties and are best used when making heavy cuts, at high speeds and feeds, or where high heat is a factor.

Chemical composition Mechanical Properties

The mechanical properties of M35 molybdenum high speed tool steels are tabulated below.

Physical Properties Thermal Properties

The following table shows the thermal properties of M35 molybdenum high speed tool steels.

Applications

Used in conditions where the demand for hot hardness is important. It is also a good quality wear resistant grade for cold work applications. Commonly used for cutting tools including broaches, milling cutters, reamers, end mills and saw blades.Twist drills, taps, knives, and hobs.

HEAT TREATMENT