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High Speed Steel –M2 with good quality and high hardness

Difference between skh 9 high speed steel and m2 high speed steel

SKH-9 high-speed steel is a high-speed tool steel imported from Japan’s Fujichi NACHI. It is a high-performance tungsten-molybdenum-based general-dissolved high-speed tool steel with good toughness. It belongs to the same class of steel as JIS standard SKH-51 high-speed steel. Universal high-speed tool steel, currently used in a large amount in the world. The carbide structure of SKH-9 high-speed steel is fine, neat, and evenly distributed. It has the plasticity, processing performance, and grinding performance of hot work die steel and cold work die steel. It’s better.

M2 high-speed steel is a molybdenum-based high-speed tool steel imported from Finkel in the United States. It has the advantages of small carbide unevenness and high toughness. However, M2 is easy to overheat and has a greater tendency to carbide, so it requires more heat treatment protection. Strict, the temperature of quenching heating should be strictly controlled. Because the hardness and wear resistance of M2 mold steel are very good, most users are mostly used to make difficult cutting materials with a knife and molds that are subjected to vibration and impact loads. The M2 high-speed steel imported from the United States is appropriately added with the metal element cerium. Cerium can reduce the segregation of alloying elements such as tungsten and molybdenum in high-speed steel, reduce the amount of eutectic carbides and refine them, and cerium mainly segregates in the grain boundary eutectic carbides. At the interface with austenite, a part of cerium participates in the formation of cerium-containing M2 carbides, and cerium promotes network breakage and spheroidization of eutectic carbides when heated at high temperatures. M2 is a standard high-speed steel created by a reasonable element formula and patented melting technology. It has a uniform chemical composition, high toughness and excellent cutting properties.

According to the metal element and the applicable environment and location, the US M2 and Japanese SKH-9, SKH-51, and German 1.3343 are similar materials. When there are no special requirements, they can be replaced with each other, but they cannot completely match because of the smelting process and quality requirements. And alloy elements are not the same.

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High Speed Steel –M2 with good quality and high hardness

Composition and specific gravity of M2 high-speed steel

With the rapid development of science and technology, a variety of difficult-to-machine materials continue to emerge, high-performance high-speed steel and powder metallurgical high-speed steel have appeared one after another, and general-purpose high-speed steel still occupies the main position of the market. M2 high-speed steel, as a highly versatile and widely recognized mold steel material, today we will introduce the composition and proportion of M2 high-speed steel. What are the advantages and disadvantages?

Composition and specific gravity of M2 high-speed steel

Chemical composition of M2 high speed steel: carbon C: 0.80 to 0.90, silicon Si: 0.20 to 0.45, manganese Mn: 0.15 to 0.40, sulfur S: ≤ 0.030, phosphorus P: ≤ 0.030, chromium Cr: 3.80 to 4.40, nickel Ni: ≤ 0.30, copper Cu: amount ≤ 0.25, vanadium V: 1.75 to 2.20, molybdenum Mo: 4.50 to 5.50, tungsten W: 5.50 to 6.75.

The specific gravity of M2 high-speed steel is between 8.5 and 9.0.

What are the advantages and disadvantages of M2 high speed steel?

M2 high-speed steel is a molybdenum-based high-speed steel, which has the advantages of small carbide unevenness and high toughness. Its shortcomings are prone to overheating, so the quenching heating temperature should be strictly controlled, and the heat treatment protection requirements are stricter. Because of its good hardness and wear resistance, it is mostly used to make tools for cutting difficult-to-cut materials. M2 high speed steel has a large tendency of carbides, so it has strict requirements on heat treatment protection, and is suitable for molds that can withstand shock and impact loads.

Heat treatment temperature and reference method of M2 high speed steel:

Annealing: heating to 800 ℃ ～ 850 ℃, then slowly cooling;

Quenching: heating to 1160 ℃ ～ 1220 ℃, oil quenching or hot bath;

Tempering: heating to 550 ℃ ~ 580 ℃, and then air cooling.

Main applications: cold forging dies, fine blanking dies, powder pressing dies, shearing dies, plastic dies with glass fiber, etc. Moulds suitable for shock and impact loads: deep-drawing dies, punching dies. Metal cutting saw blades, cold heading and extrusion tools.

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42CD4 Steel Plate the best raw materials for make facemask machine mould . In the beginning of this year 2020 . From January to now , the coronavirus spread to all over the world . And the best way to avoid of infect for this were wearing with facemask .

In the special period affected by the new crown virus in the world . The daily demand for masks has reached the maximum . And the demand for mask machines for producing masks has also increased greatly . It is used as the raw material for the mold of the mask machine . The demand for 42CD4 Steel Plate is taken for granted .

42CD4 Steel Plate

42CD4 Steel Plate the best choice of make facemask machine mold . 42CD4 Alloy steel material stockholders and suppliers from China-OTAI SPECIAL STEEL . we have more 16 years experience in 42CD4 steel plate, round bar, flat bar, square supply . 42CD4 alloy steel is chromium, molybdenum, manganese containing low alloy steel .

It has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength. The following datasheet gives an overview of 42CD4 alloy steel.

42CD4 alloy steel material is a high quality Quenched and Tempered Alloy Structural steel, It belong to the high quality medium carbon alloy steel, Oil Quenched & Tempered Hardenss is 28-34 HRC . 42CD4 Annealing delivery hardenss less than 250HB .

42CD4 Tool steel is a alloy structural steel .  42CD4 is used for engineering structural, like high tensile shafts, bolts and nuts, gears .  pinions and spindles . Locomotive traction with the big gear, supercharger drive gear, pressure vessel, rear axle .  gear load of connecting rod and a spring clip, 42CD4 can also be used to under 2000 m deep well of oil drill pipe joint  . and the fishing tool, and can be used for bending machine mould, etc

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1.2311 Mould Steel the best way for make plastic mould . OTAI SPECIAL STEEL is Din 1.2311 steel stockholders and suppliers from china . we have more than 16 years experience in 1.2311 special steel and plastic mould steel supply.

1.2311 tool steel is a mould materials for plastic injection . It belong to the high quality medium carbon,Pre-hardness(28~34HRc) .  Cold work plastic mould steel . It no need further heat treatment . so you don’t have any worry about distortion or cracking . 2311 steel is most widely used to plastic mold material in injection plastic mould.

1.2311 Mould Steel suitable for make plastic mold . we can supply the round bar, flat bar, plate, hexagonal and square block . Diameters can be sawn to your required lengths as one offs or multiple cut pieces .

Rectangular pieces can be sawn from flat bar or plate to your specific sizes . Ground tool steel bar and precision ground steel plate can be supplied . providing a quality precision finished bar to tight tolerances.

1.2311 Mould steel is a German Die steel, the steel by “super clean” production process, pre hardened . showing the height of micro pure and excellent homogeneous structure, excellent polishing and light etching engraving .

After heat treatment, processing and polishing performance is good, can be carried out . and can be processed, suitable for the surface treatment of chrome, material hardness even (to 400mm thick) .  good toughness, good mechanical processing performance. Gold microstructure is martensite and bainite structure.

Main be applied to in zinc, aluminum, magnesium and its alloy die-casting mould .  Hot-pressing mold, all kinds of hot forging die; Metal extrusion die, die set.

1.2311 Tool steel round bar and flat sections can be cut to your required sizes . 1.2311 tool steel ground bar can also be supplied, providing a high quality tool steel precision ground tool steel bar to your required tolerances . 1.2311 tool steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes.

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High Speed Steel –M2 with good quality and high hardness

The difference between m2 high-speed steel and 6542 high-speed steel

In the field of modern mechanical processing, whether it is traditional manufacturing such as machinery, automobiles, ships, railways, molds, textiles, etc .; high-end and emerging applications include aerospace, information industry, etc., high-speed steel is widely used. m2 high-speed steel, as a molybdenum-based high-speed steel, has a mold with small carbide unevenness and high toughness. Suitable as a mold for shock and impact loads. Because of its moderate hardness and abrasion resistance, it is mostly used to make material tools that are difficult to cut.

The difference between m2 high-speed steel and 6542 high-speed steel

The difference between m2 high-speed steel and 6542 high-speed steel is that m2 is an American standard grade, and 6542 is the common name of domestic W6Mo5Cr4V2 grade.

m2 high-speed steel is a molybdenum-based high-speed steel, commonly known in China as 6542. Corresponding to US steel standard US steel standard t11302 and US astm / aisiae standard steel steel m2 (normal carbon), the hot working specification start temperature is 1040 ～ 1150 ℃, and the end temperature is 930 ℃. The annealing standard temperature is 820 ～ 870 ℃, and the hardness after annealing is 207 ～ 235hbs. The normal quenching and tempering specifications have a quenching temperature of 1190-1230 ° C, the quenching medium is oil, air cooling or a salt bath, a tempering temperature of 540-600 ° C, and a hardness of 65-60hrc. Die quenching and tempering specifications preheating temperature 730 ~ 850 ℃, quenching temperature salt bath furnace 1216 ℃, controlled atmosphere furnace 1227 ℃, tempering temperature 550 ℃, hardness after tempering ≥ 64hrc.

The corresponding grade of m2 high-speed steel in China is W6Mo5Cr4V2. There is no difference in chemistry and properties.

We all know that the chemical composition of m2 high-speed steel is: carbon C: 0.80 to 0.90 silicon, Si: 0.20 to 0.45 manganese, Mn: 0.15 to 0.40, sulfur S: ≤ 0.030, phosphorus P: ≤ 0.030, chromium Cr: 3.80 to 4.40, Nickel Ni: allowable residual content ≤ 0.30, copper Cu: allowable residual content ≤ 0.25, vanadium V: 1.75 to 2.20, molybdenum Mo: 4.50 to 5.50, tungsten W: 5.50 to 6.75.

Application fields of m2 high-speed steel and 6542 high-speed steel ① Moulds suitable for bearing shock and impact loads: deep-drawing dies and punching dies. ② Metal cutting saw blades, cold heading and extrusion tools.

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High Speed Steel –M2 with good quality and high hardness

There a column mentioned a question that does the high speed steel M2 can be made a kitchen knife ?

It is a common that all high speed steel with good quality because its own with high alloy chemical in sheet chart but it is doesn’t mean that can work every thing by M2 tool steel .

M2 tool steel generally application in the heavy industrial ‘s knife , such as the drill , Moulds suitable for shock and impact loads: deep-drawing dies, punching dies. Metal cutting saw blades, cold heading and extrusion tools.

From the perspective of ensuring specific hardness, Mo and W have similar effects. This steel has the advantages of small carbide unevenness and high toughness, but there are two major disadvantages, which limits its application.

First, the tendency of decarburization is large, so the heat treatment protection requirements are strict. Second, the tendency of grain growth is large, and it is easy to overheat, so the quenching heating temperature should be strictly controlled.

Mould steel characteristics M2 high-speed steel is a molybdenum-based high-speed tool steel. From the perspective of ensuring specific hardness, Mo and W have similar effects. This steel has the advantages of small carbide unevenness and high toughness, but there are two major disadvantages, which limits its application.

First, the tendency of decarburization is large, so the heat treatment protection requirements are strict; second, the tendency of grain growth is large, and it is easy to overheat, so the quenching heating temperature should be strictly controlled.

Delivery status and hardness Annealed, hardness 248HBS; cold-drawn, hardness 262HBS; cold-drawn, annealed hardness 255HBS.

Typical chemical composition (mass fraction,%) of M2 high speed steel C 0.78 ～ 0.88, Si 0.20 ～ 0.45, Mn 0.15 ～ 0.40, P≤0.030, S≤0.030, Cr 3.75 ～ 4.50, Mo 4.50 ～ 5.50, V 1.75 ～ 2.20, W 5.50 ～ 6.75.

Hot working specifications The starting temperature is 1040 ～ 1150 ℃, and the ending temperature is 930 ℃.

Annealing specification Temperature 820 ～ 870 ℃, hardness 207 ～ 235HBS after annealing.

General quenching and tempering specifications The quenching temperature is 1190 ～ 1230 ℃, the quenching medium is oil, air cooling or salt bath, the tempering temperature is 540 ～ 600 ℃, and the hardness is 65-60HRC.

Die quenching and tempering specifications Preheating temperature 730 ～ 850 ℃, quenching temperature salt bath furnace 1216 ℃, controlled atmosphere furnace 1227 ℃, tempering temperature 550 ℃, hardness after tempering≥64HRC

Typical application examples of M2 high speed steel

① Moulds suitable for bearing shock and impact loads: deep-drawing dies and punching dies.

② Metal cutting saw blades, cold heading and extrusion tools.

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High Speed Steel –M2 with good quality and high hardness

M2-1.3343-SKH51-W6M5CR4V2

Difference grade with difference chemical component chart .

All depend on your standard’s request .

All grades of the above that we can supply with you for the regular size in our stock .

M2 high speed steel with great hardness so its appliance to many high-end part in the machine or life service .

hemical composition editing

Carbon C: 0.80 ～ 0.90 (Allowable deviation: ± 0.01)

Silicon Si: 0.20 ～ 0.45 (Allowable deviation: ± 0.05)

Manganese Mn: 0.15 ～ 0.40 (allowable deviation: +0.04)

Sulfur: ≤0.030

Phosphorus P: ≤0.030

Chromium Cr: 3.80 ～ 4.40 (Allowable deviation: ± 0.05)

Nickel Ni: Allowable residual content ≤ 0.30

Copper Cu: Allowable residual content ≤0.25

Vanadium V: 1.75 to 2.20 (permissible deviation: ± 0.05)

Molybdenum Mo: 4.50 ～ 5.50 (Allowable deviation: size≤6, ± 0.05; size> 6, ± 0.10)

Tungsten W ： 5.50 ～ 6.75

Note: According to the agreement between the supply and demand sides, the content of V can be 1.60 ～ 2.20

The main purpose:

Cold forging die, fine blanking die, powder pressing die, etc. Shear die, plastic die with glass fiber, etc. Moulds suitable for shock and impact loads: deep-drawing dies, punching dies. Metal cutting saw blades, cold heading and extrusion tools.

Solidification edit

The effect of Ce on the solidification structure of M2 high-speed steel and its mechanism were studied. It was found that Ce in high-speed steel can reduce the segregation of alloying elements such as W and Mo, and reduce and refine the amount of eutectic carbides. Ce is mainly segregated at the interface between grain boundary eutectic carbides and austenite, with some Ce. Participates in the formation of Ce-containing M2C carbides; Ce promotes network breakage and pelletization of eutectic carbides when heated at high temperatures.

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Introduction of 30CrNiMo8 alloy steel

30CrNiMo8 has high yield strength, tensile strength and fatigue strength, as well as sufficient plasticity and toughness. Generally, electric arc furnace and oxygen top-blown converter are used for smelting. If it needs to be with more higher requirements. It is made by the external furnace refining, electroslag remelting or vacuum processing, vacuum induction furnace smelting or double vacuum smelting, and appropriate heat treatment.

How about the 30CrNiMo8 application?

30CrNiMo8 steel has a wide range of uses.It is not only used on the high pressure chemical tanks with high pressure and frequent fluctuations. But also used in pressure pipes, plastic molds, and important structures.

It is an alloy structural steel. It is used in engineering structures such as high-strength shafts, bolts and nuts, gears and spindles. Locomotive traction gears, supercharger transmission gears, pressure vessels, rear axles, connecting rod gear loads and spring clips. 30CrNiMo8 can also be used for oil drill pipe joints and fishing alloys below 2000 meters deep wells, for bending machine molds.It is for permanently stressed components with large cross sections for automotive and mechanical engineering.

Our OTAI Special steel could supply this 30CrNiMo8 steel material in round and flat bar. We are the stockiest for different special steel material for more than 21years. And even the Chinese steel market is complicated, but we know  deeply about each steel mill for their specialty. With the long time pre-after sales steel business, OTAI helps the distributor and end users to avoid the quality event complain. So that most of customers place the repeat order to us without any worry. Quality is at the heart of our company as the first, that is why we are professional here on this steel field for over 21years.

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High Speed Steel –M2 with good quality and high hardness

Heat Treatment of M2 Steel HSS

• Anneal

Heat to 1600° F, soak thoroughly at heat. Furnace cool 25° F per hour to 900° F, air cool to room temperature. Approximate annealed hardness 241 Maximum Brinell.

Stress Relief of Unhardened Material: Heat slowly to 1200 to 1250° F. Soak for two hours per inch of thickness at heat. Slow cool (furnace cool if possible) to room temperature.

• Harden

Heat slowly to 1550° F, soak thoroughly, heat to 1850° F, soak thoroughly. Soak time in the furnace varies from a few minutes to 15 minutes, depending tool size, heat capacity of the furnace, and the size of the charge. – Heat to 2150 to 2200° F for max. toughness and minimum distortion. – Heat to 2250 to 2275° F for max. hardness and abrasion resistance.

• Quench

For full hardness, oil quench to 150-200° F. Air quench to 150° F. When quenching in hot salt maintain the quench just above the Ms temperature. After equalizing withdraw parts from the hot salt and air cooled to 150° F.

• Temper

Double temper is mandatory, three tempers are sometimes preferred. Soak for 2 hours per inch of thickness. Air cool to room temperature between tempers. The best tempering range for hardness, strength and toughness is 1000 to 1050° F.

 Machinability of AISI M2 Tool Steel H-SS

Shaping of HSS M2 tool steels can be carried out using grinding methods. However, they have poor grinding capability and hence they are regarded as “medium” machinability tool steel under annealed conditions. The machinability of these tool steels M2 is only 50% of that of the easily machinable W group or water hardening tool steels.

 M2 Tool Steel Applications

The main use of high-speed steels continues to be in the manufacture of various cutting tools.

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 widely used in all kinds of cutting tools, knife and punches and die applications, plastic moulds with elevated wear resistance and screws.

Contact us for M2 tool steel price request. We are a better M2 steel tool material supplier for you.

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High Speed Steel –M2 with good quality and high hardness

WhatsApp: +86-769-23190193

Tel: +86-769-23190193

Fax: +86-769-88705839

Email: Jack@otaisteel.com