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1.2738 mold steel

1.2738 mold steel is a mold steel material produced in accordance with the German DIN standard. It has relatively superior mechanical properties and good processability among similar grades of steel. It is mainly used for processing and production of hot work molds. Among them, plastic molds are the most common . In addition, the special pre-hardening treatment of the steel makes it have a good hardness when it leaves the factory, which can reduce the heat treatment link in the processing and production of normal molds and improve economic efficiency.

1.2738 mold steel is pre-hardened plastic mold steel

1.2738 steel uses advanced mold steel refining technology, which is a Cr-Ni-Mo alloy steel that is vacuum-melted. The steel has excellent polishability and photoetching performance; excellent workability; good wear resistance; large molds have uniform hardness and dense structure; no risk of cracking and heat treatment deformation, no heat treatment required, shortening the mold making cycle; good Surface nitriding property; surface flame hardening treatment can be performed to improve mold surface hardness and wear resistance. Before the mold is quenched, it must be fully softened and annealed. After quenching, temper in time and heat slowly.

Fine-discharge machining at the post-electro-machining stage should be performed with low current and high frequency to avoid damage to the mold. After discharge, the surface of the mold should be ground to remove the “electric spark white layer”, and then tempered at 500 ° C to remove stress.

When grinding the tempered mold, in order to prevent grinding cracks and surface softening, attention should be paid to: adequate cooling; appropriate grinding pressure; reasonable processing technology.

The steel pre-hardened steel has good polishing performance, usually alumina or gypsum polishing. The first is rough polishing, and then polishing with increasingly finer abrasives. The polishing direction of the abrasive must be changed each time. The final polishing time should not be too long, otherwise it will affect the surface roughness of the mold.

Nitriding can increase the hardness of the mold surface, improve wear resistance and corrosion resistance. Although the steel has been pre-hardened, the hardness can be increased by heat treatment.

Chemical composition editing

C: 0.35-0.46

Si: 0.2-0.4

Mn: 1.3-1.6

P: ≦ 0.035

S: ≦ 0.005

Cr: 1.8-2.2

Mo: 0.15-0.25

Ni: 0.9-1.2

Reference grade editing

Chinese GB standard grade 3cr2NiMo, German DIN standard grade 40CrMnNiMo8 6 4. German DIN standard material number 1.2738, American AISI standard grade P20 + Ni, Japanese JIS standard grade PDS5S,

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High Speed Steel –M2 with good quality and high hardness

High temperature mechanical properties of M2 high speed steel

M2 high-speed tool steel was born in 1937. Due to its excellent performance and reasonable price, it is still the most widely used high-speed steel variety. It is often used in the processing of aerospace superalloys, ultra-high-strength steels and stainless steels. A large number of scientific research and production workers are still optimizing their production processes and improving quality performance. This work uses thermal simulation methods to conduct high temperature tensile tests, study the high temperature mechanical properties of M2 high speed steel, and provide a meaningful reference for related M2 steel production.

The raw materials for the test are taken from industrially produced M2 steel round rods (diameter Φ12mm). The chemical composition of the test steel is shown in Table 1 (mass fraction). The raw materials are processed into Φ10mm × 120mm high-temperature tensile test specimens. After the specimens are heated to the test temperature using a Gleeble-3800 testing machine, high-temperature tensile and mechanical performance tests are performed. The test temperature is 1000 ～ 1250 ℃, and the strain rate is 5 × 10-3 / s. The tensile sample was observed by German Leica MEF4M optical microscope. HitachiS-4300 was used for SEM observation and carbide EDS analysis.

The results showed that:

(1) The zero plastic temperature of M2 high speed steel is 1220 ° C, and the zero strength temperature is 1250 ° C.

(2) The good plasticity region of M2 high-speed steel is in the temperature range of 1150 ~ 950 ° C. Within this range, it enters the high-temperature region where the matrix structure is austenite single-phase region, and dynamically recrystallizes to provide good plasticity properties.

(3) The brittle region of M2 high-speed steel is from 1175 ° C to the melting point Ts. This temperature range results in the melting of low-melting eutectic carbides, which significantly reduces the plasticity and strength of the steel.

(4) There is a low-temperature superplastic zone near 800 ℃ for M2 high-speed steel. This zone is the coexistence zone of α + γ two phases of M2 steel. It is worthwhile to pay more attention to the improvement of carbide breakage and uniformity by performing hot working in this zone. Direction.

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High Speed Steel –M2 with good quality and high hardness

Is M2 high-speed steel a knife? Main uses of M2 high-speed steel

Recently, enthusiasts of knives asked, how good is M2 high-speed steel for knives?

We all know that high-speed steel is also called wind steel or white steel. An alloy steel containing a large amount of carbon (C), tungsten (W), molybdenum (Mo), chromium (Cr), vanadium (V) and other elements. The high-speed steel wool material has high heat hardness after cutting, forging, annealing, semi-finished products, quenching, and toothing. When the cutting temperature is as high as 600 ° C or above, the hardness is still not significantly reduced, and the cutting speed of the saw blade can reach more than 60 meters per minute.

There are many ordinary high-speed hacksaw blades, which are not listed here one by one. Take the most commonly used in the market, and one of the most high-speed steel materials sold by our company — M2 high-speed steel.

M2 high-speed steel in China is similar to W6Mo5Cr4V2 (commonly known as 6542, US brand M2). M2 high-speed steel is mainly used for narrow and deep groove processing or cutting of metal materials such as steel, iron, copper, and aluminum. It can also be used for non-metal milling. M2 high-speed steel is one of the best mold materials for milling cutters. .

Tungsten-molybdenum-based high-speed steel M2 high-speed steel has a series of advantages such as fine and uniform carbide distribution, high wear resistance, high toughness and thermoplasticity, and high cost performance. The high-speed steel produced by it, after high-precision quenching, has a hardness of 62 ~ 64HRC, a bending strength of 4700MPa, and a 50% increase in toughness and thermoplasticity than w18Cr4V. Due to the wear resistance, heat resistance, toughness and other aspects of M2 material high-speed steel, the performance is good, and the performance-price ratio is high, which is welcomed by customers.

The main uses of M2 high-speed steel: cold forging dies, fine blanking dies, powder pressing dies, etc., shear 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.

In short, I know through some relevant tool stickers and forums that M2 high-speed steel is also used to make kitchen knives or collect knives. However, the practicality is not high. After all, its high hardness and wear resistance make it destined to be not well. Home sharpening. And its cost is generally too high, only suitable for cutter enthusiasts.

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High Speed Steel –M2 with good quality and high hardness

The difference between m2 high speed steel and m35 high speed steel

In the metal stamping industry, we use more M2 high-speed steel. M35 high-speed steel may be relatively unknown to everyone. Today we introduce the difference between M2 high-speed steel and M35 high-speed steel, and the advantages and disadvantages of M2 high-speed steel. .

M2 high-speed steel in China is similar to W6Mo5Cr4V2 (commonly known as 6542, US brand M2). M2 high-speed steel is mainly used for narrow and deep groove processing or cutting of metal materials such as steel, iron, copper, and aluminum. It can also be used for non-metal milling. M2 high-speed steel is one of the best mold materials for milling cutters. .

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 to 6.75.

Tungsten-molybdenum-based high-speed steel M2 high-speed steel has a series of advantages such as fine and uniform carbide distribution, high wear resistance, high toughness and thermoplasticity, and high cost performance. The high-speed steel produced by it, after high-precision quenching, has a hardness of 62 ~ 64HRC, a bending strength of 4700MPa, and a 50% increase in toughness and thermoplasticity than w18Cr4V. Due to the wear resistance, heat resistance, toughness and other aspects of M2 material high-speed steel, the performance is good, and the performance-price ratio is high, which is welcomed by customers.

The main uses of M2 high-speed steel: cold forging dies, fine blanking dies, powder pressing dies, etc., shear 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.

The difference between m2 high speed steel and m35 high speed steel

M35 high-speed steel is similar to W6Mo5Cr4V2Co5 in China, and its heat treatment hardness can reach 64-67 HRC. Features: Tungsten-molybdenum-based cobalt-containing high-speed steel has higher red hardness and wear resistance than W6Mo5Cr4V2. The steel has better cutting performance, but its strength And low impact toughness, easy oxidation and decarburization during hot working and heat treatment.

Chemical composition (mass fraction,%) of M35 high-speed steel:

C 0.88 ～ 0.95

Mn≤0.40

Si≤0.40

Cr 3.80 ～ 4.50

Mo 4.75 ～ 5.20

V 1.75 ～ 2.00

W 6.00 ～ 7.00

P≤0.030

S ≤0.030

Co 4.60 ～ 5.00.

M35 high-speed steel is mainly used for hobs, broaches, and end mills. It is suitable for manufacturing abrasion-resistant and impact-resistant tools for advanced cutting, advanced dies, screw dies, tools that require toughness and complex shapes, reamer, milling cutter, iron head, punch, etc.

It can be known from the above comparison that M2 high speed steel is higher in cost performance than M35 and has a wider range of applications. And the strength and toughness are better than M35, the oxidation resistance is better. Of course, the disadvantage of M2 high-speed steel is that it is easy to overheat during heat treatment, which requires higher skills and processes to master.

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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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