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AISI 8620 Round Bar alloy Steel is a high quality Quenched and Tempered Alloy Structural steel .  It belong to the high quality low carbon . Low alloy chromium, molybdenum, nickel case hardening steel . Oil Quenched & Tempered Hardenss is 28-34 HRc . AISI 8620 steel Annealing delivery hardenss less than 250HB.

AISI 8620 Alloy structural steel properties is a Nickel chromium molybdenum alloy steel specification .

8620 With a lower carbon content range, So AISI 8620 alloy steel have good weldability .  AISI 8620 Steel is equivalent to Din 21NiCrMo2 | W-Nr 1.6523, GB 20CrNiMo, BS 805M20, NF 20NCD2,JIS SNCM220 Steel. Most applications can replace each others

Related Specifications ASTM A29/A29M DIN EN 10083/3 JIS G4053 GB GB/T 3077 .

AISI 8620 Round Bar Annealled have stocklist for sales promotion in April . Dongguan OTAI SPECIAL STEEL is 8620 Alloy steel stockholders and suppliers from china . More 16 years experience in AISI 8620 steel plate, flat bar,round bar, square supply.

AISI 8620 steel is widely used for a variety of applications . For the used in the automotive and engineering industries for toolholders and other such components . Typical applications such as valve bodies, pumps and fittings, Shaft . The high load of wheel, bolts, double-headed bolts, gears, etc .

AISI 8620 alloy steel round bar and flat sections can be cut to your required sizes . 8620 alloy steel ground bar can also be supplied, providing a high quality tool steel precision ground tool steel bar to your required tolerances. AISI 8620 steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes .

Although the coronavirus infected all over the world . But the sales promotion of AISI 8620 alloy steel did not affected .  The round bar hot rolled and Annealled have lots of inventory . Any intersting , please contact with us directly .

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1.2738 mold steel

Basic information for 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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If you are looking for 40 CMD8+S steel, you can stretch out to me, Otai company provides a different kind of material for the mold factory.

With the development of china’s economy, the mold industry plays an important role day by day. The mold industry is still a potential industry. I would like to talk about the mold steel 40 CMD8+S with you.

the future of 40 CMD8+S steel as a part of mold factory.

40 CMD8+S steel is standard of French, it is equivalent to p20+s. It is a high alloy Chrome Cold work tool steel, it is also widely used in the manufacture. The mold industry has a history of about 50 years in china. It has a great improvement in 2010. However, with fierce competition, it is really hard to be an excellent one in the mold industry. As a member Otai steel company, in my opinion, the spring of mold steel will come soon.

Every country is tortured by the pandemic, every industry faced a hard time. at this key moment, the mask is badly needed. The mask factory is busy buying the mask mold steel to produce more masks. The mold industries play a vital role. In china, the manufacture is still important .it means the mold industry has a bright future.

40 CMD8+S is made for the cold work Plastic tool steel Materials, it has good cutting properties, usually uses a plastic mold, Injection molding and die mold. The P20S steel materials delivery condition as per different customer requirements, usual delivery condition as Pre-hardness, hardness 28-34 HRC. Otai special steel is a professional AISI P20S tool steel supplier, Inventory and manufacturer.

Application of 40 CMD8+S steel

Tool steel P20 + S is suitable for mold production, improve the machining performance is required. Typical applications include support and injection mold, mold holders and zinc die casting mold. P20S is a versatile plastic mold and the characteristics of high strength steel apply to many other applications, such as axis and wear a belt.

If you are looking for 40 CMD8+S, you can stretch out to me, Otai company provides a different kind of material for the mold factory. Any questions, you can send me an email.

Mr Jack Tan

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1.2738 mold steel

Main performance editor-1.2738 MOULD STEEL 

1. Uniform hardness

2.Excellent polishing performance

3.Good machining performance

4.Pre-hardened plastic mold steel

5. Nitriding can be applied
6. Suitable surface treatment, such as: Cr plating

Physical properties edit

(Sample hardness 340HBW, at room temperature and high temperature)

1) Temperature 20 ° C / 200 ° C / 400 ° C, density 7.8g / cm / 7.75g / cm / 7. 7g / cm.

2) Temperature 20 ~ 200 ° C / 20 ~ 400 ° C, coefficient of linear expansion: 12.6 × 10K / 13.5 × 10K.

3) Temperature 20 ° C / 200 ° C / 400 ° C, thermal conductivity 29.0W · (m · K) /29.5W· (m · K) /31.0W· (m · K)

4) Temperature 20 ° C / 200 ° C / 400 ° C, elastic modulus: 205000MPa / 200000MPa / 185000MPa

Editing of mechanical properties

(Sample hardness 340HBW)

1) Temperature 20 ° C / 200 ° C / 400 ° C, tensile strength 1100MPa / 1050MP8 / 850MPa.

2) Temperature 20 ° C / 200 ° C / 400 ° C, conditional yield strength 980MPa / 925MPa / 770MPa.

3) Temperature 20 ° C / 200 ° C / 400 ° C, reduction in area of ​​49% / 51% / 52%

4) Temperature 20 ° C / 200 ° C / 400 ° C, elongation 13% / 14% / 16%

5) Temperature 20 ° C / 200 ° C / 400 ° C, impact toughness (≥) 20J / cm / 32J / cm / 42J / cm

Process specification editor

Soft annealing

The annealing temperature is 710 ~ 740 ° C, and the heat preservation time is determined by 1h per 25mm wall thickness. After the heat preservation, it is cooled with the furnace.

Destress

The heating temperature is 600 ° C (annealed state), 550 ° C (quenched and tempered state). The heat preservation time is determined as 1h per 50mm wall thickness. After the heat preservation, it is cooled with the furnace.

Quenching and tempering

Preheating temperature is 500 ~ 600 ° C, quenching temperature is 840 ~ 880 ° C, heat preservation is 30min (the mold must be quenched in a protective atmosphere to avoid oxidation and decarburization). Oil-cooled, cooled to 50 ~ 70 ° C, and tempered immediately.

Tempering and holding time is determined according to the thickness of the workpiece 1h every 25mm, at least 2h. Tempering temperature 180 ° C / 200 ° C /

300 ° C / 400 ° C / 500 ° C / 600 ° C, hardness 52HRC / 51HRC / 48 HRC / 46HRC / 42HRC / 34HRC.

Induction hardening

The steel can be surface-hardened to 50HRC by flame or induction hardening, and air-cooled after hardening. Small modules can use general quenching medium. After hardening, they should be tempered immediately. The tempering temperature is 180 ~ 200 ° C.

Nitriding Specification

Nitriding temperature × nitriding time: 525 ° C × 20h, nitride layer thickness 0.30mm; 525 ° C x30h, nitride layer thickness 0.35mm; 525 ° C × 50h, nitride layer thickness 0.50mm.

Soft nitriding

After 570 ° C for 2h, the surface hardness of the mold is about 700HV, and the depth of the nitrided layer is about 0.1mm. [2]

Practical application

1.-Skin pattern, pear skin pattern, imitation stone pattern etching mold.

2.- Transparent plastics such as stationery boxes and daily necessities containers require high gloss molds.

3.- Particularly suitable for hard rubber (PS) and non-breakable rubber (ABS) parts.

4.- Large molds with high output requirements such as automobile bumpers, interior parts, refrigerators, and air conditioners.

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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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