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High speed steel is divided into Melting high speed steel and powder metallurgy high speed steel.

Powder High Speed Steel (powder treated steel) is one of high speed steel,which produced by high pressure argon or pure Nitrogen atomized molten process.

Advantages of Powder High Speed Steel :

(1) With well and uniform crystalline structure can be obtained.It has good mechanical properties.

The carbide distribution is more uniform, resulting in stronger strength and toughness, and greater variable opening force.

(2) With better grinding property than general high speed steel ,

It can help to improve the grinding efficiency while it processing as tools ,  and it will  have a well grinding surface for cutting item.

(3) Decresing the deformation as quenching heat treatment process .

(4) The wear resistance more 20%-30% than general high speed steel .

(5) High qualified production rate of hot-forming .

Application:

Suitable for manufacturing cutting tools and large size tools (such as: hob, gear shaper, etc.), It is also suitable for manufacturing precision tools and complex tools which with large grinding capacity, and use in those tools (continuous cutting tools) used under high pressure dynamic load.

Powder high speed steel, It make up for the common high speed steel inherent defects because of the  the good structure uniformity and carbide segregation characteristics, , and improve High speed steel quality and performance .

Ms Elwa Lee

Mobile/WhatsApp: 0086-15899675236

Tel: 0086-769-23190193

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Email: Elwa@otaisteel.com

OTAI Special Steel supplied 4140 steel equivalent 42CrMo, is widely accepted equivalent material for DIN 42CrMo4, 1.7225, EN 19, SCM440, 708M40, 42CD4. Purchase 42CrMo, under the guidance of our engineer, can cut down 20% composite cost for steel distributor

Most customer purchase 42CrMo as 4140 steel equivalent, especially customer from North America, South America, Australia. We sell large quantity to such district big quantity each year.

Why China standard 42CrMo are widely accepted as 4140 steel equivalent word wide?

1. Mechanical Performance for 42CrMo and 4140 steel are similar
2. Price for 42CrMo is much cheaper compared 4140 and other mentioned grade above
3. 42CrMo is the most widely used engineering alloy steel in China, usage is huge, stock is enough
4. China standard steel quality is good, and qualified at almost all condition 4140, 42CrMo4, 1.7225, SCM440, 708M40 and EN19 applied.

Chemical composition for 4140 steel equivalent 42CrMo and other equivalents

OTAI Special steel focus on special steel industry above 20 years. Our professional engineer always provide our customer most suitable technique proposal, which will help customer save cost a lot. Especially for the customer who consume big bulk purchase, will save big money for them. We have a customer from Chile, who always import 4140 steel from America. We find their information from their website, try to connect them. At first, it is not smoothly for communication, because their always use material from America, and they do not trust material imported from China. After several months, we get know their application details, our engineer find they can use 4140 steel equivalent 42CrMo instead, that will help them save a lot of cost. Chile customer find our price help them cut more than half cost if our material meet their application requirement. We sent them free samples for test, finally approved by end user. We already work together with this customer above 5 years, regular purchase 4140 steel equivalent 42CrMo from OTAI steel every two months.

If you are purchasing material 42CrMo4, 1.7225, SCM440, 708M40 and EN19, you can contact us for a trail. It is good option for you to consider China standard 42CrMo.

Ms Susie Li

Mobile/WhatsApp: 0086-13826999755

Tel: 0086-769-23190193

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Email: Susie@otaisteel.com

High speed steel is one of high alloy tool steel with more chemical composition of  W, Mo, Cr, V and other alloying elements. Usually ,The HSS with follow property

• High thermal stability
• High strength and toughness
• Simple manufacturing process
• The cutting performance is stable.

According to different  Usage :

it is classified as  generalhigh speed steels and high performance high speed steel.

General high speed steel: Carbon chemical composition : 0.7%-0.9%, it is also named For medium thermal stability high – speed steel according to the heat resistance . it is widely used in the manufacture of various complex cutting tools because of its good thermal stability and cutting performance.

The HSS is very famous by the cutting tooling for cutting those structural steel and cast ingot which  hardness below 250-280HB, The Cutting speed is not too high, cutting ordinary steel should not be higher than 40-60m/min.

According to the difference of Chemical composition :

it is divided into: tungsten(W)HSS and WMo high speed steel 

W HSS steel( Tungsten): W18Cr4V (referred to as W18),Chemical W18%, Cr4%, V1%,

High temperature hardness at 600℃ is 48.5HRC, which be used to manufacture a variety of complex tools.

Advantages: Low Thermal tendency , Good wear resistance, Plastic deformation resistance.

Weakness: strength and toughness is not enough to do large section tool, thermoplastic difference.Because the shortcomings, and the market price of tungsten is too expensive,and many countries won’t use the high W HSS material .

Cutting tools of high speed steel

Ms Elwa Lee

Mobile/WhatsApp: 0086-15899675236

Tel: 0086-769-23190193

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Email: Elwa@otaisteel.com

_{Our H13 STEEL -chapter 2}

APPLICATON OF H13 STEEL

The application of h13 steel  is basically the same as 9CRWMN mold steel, but because of H13 higher vanadium content, the medium temperature (600 degrees) performance is better than 4Cr5MoSiV steel. H13 steel is a representative steel number with a wide range of uses in hot work mold steel.

H13 die steel is used to manufacture forging dies, hot extrusion dies and precision forging dies with large impact loads; aluminum, copper and their alloy die-casting dies.

Quenching: 790 degrees + -15 degrees preheating, 1000 degrees (salt bath) or 1010 degrees (furnace controlled atmosphere) + -6 degrees heating, heat preservation for 5-15 minutes air cooling, 550 degrees + -6 degrees tempering; annealing, hot processing ;

H13 steel is a C-Cr-Mo-Si-V steel, and H13  application in the world is extremely common. At the same time, many scholars in various countries have conducted extensive research on h13 and are exploring the improvement of chemical composition. Steel is widely used and has excellent characteristics, h13 are mainly determined by the chemical composition of steel. Of course, the impurity elements in steel must be reduced. Some data show that when Rm is 1550 MPa, the sulfur content of the material is reduced from 0.005% to 0.003%,h13 will increase the impact toughness by about 13J. The NADCA 207-2003 standard stipulates that the sulfur content of the premium H13 steel is less than 0.005%, while the superior should be less than 0.003% S and 0.015% P. The composition of H13 steel is analyzed below.H13

Carbon: American AISI H13, UNS T20813, ASTM (latest version) H13 and FED QQ-T-570 H13 steel all have a carbon content of (0.32 ~ 0.45)%, which is the most carbon content range of all H13 steels. Wide. The carbon content of German X40CrMoV5-1 and 1.2344 is (0.37 ~ 0.43)%, and the carbon content range is narrow. German DIN17350 also has the carbon content of X38CrMoV5-1 (0.36 ~ 0.42)%. The carbon content of Japan SKD 61 is (0.32 ~ 0.42)%. The carbon contents of 4Cr5MoSiV1 and SM 4Cr5MoSiV1 in China’s GB / T 1299 and YB / T 094 are (0.32 ~ 0.42)% and (0.32 ~ 0.45)%, which are the same as SKD61 and AISI H13, respectively. In particular, the North American Die Casting Association NADCA 207-90, 207-97, and 207-2003 standards set the carbon content of H13 steel at (0.37 ~ 0.42)%.

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You get what you pay for, not all ESR H13 is good H13.

Not all ESR H13 is good

Purchasing H13 die steel, most of customers have the ESR requirements, because we all thought the psychological, aluminum die-casting molds,tobe erosion early, cracks, most of this problem happen are because the quality of die steel, we always believe that as long as the purchase to the ESR H13, our quality will be guaranteed,however,often we are purchasing the thing which we call H13 ESR mould,it just work for a few thousands to ten thousand times.the problem of erosion & crack still not be solved, we still can’t find the reasons of depressed, in fact, high purity of high-quality die steel, produce aluminum die-casting molds, do thirty thousands to fifty thousand times,There should be no problem, at this moment, I think of a good proverb, you get what you pay for, not all ESR H13 is good H13.

If you want to know more about it,pleasec click the link,or see as below

1. Chemical composition

2. Form of Supply

we can supply the round bar, flat bar, plate and square block. round bar can be sawn to your required lengths as one offs or multiple cut pieces. Steel plate and sheet rectangular pieces can be sawn from flat bar ,sheet or plate to your specific sizes. Ground tool steel bar can be supplied, providing a quality precision finished bar to tight tolerances.

Surface Finish: Black, Rough Machined, Turned or as per given requirements.

3. Applications 

Tool Steel is used in hot forging dies, hot forging die inserts, hot gripper dies, hot nut tools, hot header dies, brass forging and pressing dies, hot forging aluminum base dies, aluminum casting and extrusion dies, zinc die casting dies, extrusion mandrels, plastic molds, cores, die holder blocks, hot press dies, hot work punches, etc.

4. Forging

For forging tool steel, first slowly Preheat to 750°C(1382°F), soak enough time, then rapidly heat to 1050-1100 °C(1922-2030°F). then start forging, ensure the forging temperature higher than 850°C(1562°F).  Cool H13 tool steel must be slowly after H13 steel forging finished.

5. Annealing 

Heat to 840-860°C(1544-1580°F), Soak thoroughly before furnace cool at a maximum rate of 20°C(68°F) / hour, Cool down to 600°C (1112°F). Then cool in air.

6. Stress Relieving

Befor make products, The Tool steel stress relieving is very necessary.  When the tool steel is ground , heavily machined, cutting,milled , the relief of internal strains is necessary before hardening to minimise the possibility of distortion. for stress relieving, heat the steel component to 700°C(1292°F) carefully, Get  enough soaking period . Then cool in the furnace or cool in air.

7. Hardening

first should preheat the steel parts to 780-820°C(1436-1508°F), Soak enough time, ensure soak thoroughly. then rapidly heat to 1000-1030°C(1832-1886°F), soak about 30 mins. cool in air or oil.

8. Tempering

Heat the tool steel parts to tempering temperature, soak enough time until to Soak thoroughly.  The usual tempering temperature range is 400-650°C(752-1202°F), It depend on the tools hardness require and the operating temperature.  H13 tempering data for your reference as below:

9. Nitriding 

On some special tool require,  the higher hardness is required.  Nitriding the H13 steel can get a hard surface case. after Nitriding , the H13 hot work tool steel will  have a resistant to wear and erosion surface. Typical Nitriding data for your reference as below:

10. Heat Treatment

H13 heat treatment, including heat treat temperature, rate of heating, cooling and soaking times. they depend on the the size and shape and your local Climatic conditions. So if can,  we advise you contact your heat treatment provider get full guidance on heat treatment.

Ms Sharon Wan

Mobile/WhatsApp: 0086-13580960968

Tel: 0086-769-23190193

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Email: Sharon@otaisteel.com

M35 for Twist Drill Bits . The M35 High Speed Steel is known for its balanced combination of abrasion resistance, toughness and very good hot hardness. It could be produced industrial spare parts like machine spare parts, Cutting and Grinding wheels, ball Bearing, Roller chains, Twist drill bits, hand and Machines TAPS AND DIE, Hoists and Cranes, screwdriver Bits, Crown wheel and pinion for passenger car and Gundrills/Masonry drill bits and etc… .

M35 for Twist Drill Bits and Hand Thread Taps . It must use round bars and raw materials of high speed steel like M35 and M42 .

M35 for Twist Drill Bits . M35 high speed steel is similar  with M2 speed steel but with added 5% cobalt to increase hot hardness, A tungsten-molybdenum-cobalt high speed steel it is used in a variety of applications and worldwide it is the most popular high speed steel because of its superior qualities and very good hot hardness. As a result of its low carbon content, M35 high speed steel has an outstanding combination of toughness properties and abrasion resistance when correctly hardened and tempered.

Related Specifications ASTM A600-1999

Chemical composition

M35 for Twist Drill Bits is a conventionally manufactured cobalt alloyed high-speed steel. The various stages of the manufacturing process are chosen and controlled so that an end product is obtained with a good
structure in terms of carbide size and distribution. this is a distinct advantage for the finished tool .

Otai Steel supplies a wide range of carbon, alloy, and stainless steel products, including high-speed tool steel, cold works tool steel, hot works tools steel, plastic mold steel, engineering steel and machine structural steel, etc.M35 for Twist Drill Bits . Otai Special Steel could provide this materials in any size and the MOQ : mixed size for 5 Tons , any interesting , please contact back to us .

Ms Monica Yu

Mobile/WhatsApp: 0086-13711903397

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Monica@otaisteel.com

_{OUR H13 steel-chapter 1}

_{OUR H13 steel-chapter 1}

H13 (is a hot work die steel)-H13 belongs to hot work die steel. It is a steel type formed by adding alloying elements on the basis of carbon steel.

Unified number code T23353; grade 4Cr5MoSiV1. Comprehensive performance at medium temperature (~ 600 °), high hardenability (hardenable in air), low heat treatment deformation rate, and its performance and service life are higher than 3Cr2W8V. It can be used in die forging hammer forging die, aluminum alloy die casting die, hot extrusion die, high speed precision forging die and forging press die.

Mechanical properties

Hardness: annealing, 245 ～ 205HB, quenching, ≥50HRC

delivery status

Brinell hardness HBW10 / 3000 (≤229))

Main features

H13 steel is the most widely used and representative hot work die steel. Its main characteristics are:

(1) H13 has high hardenability and high toughness;

(2) Excellent thermal crack resistance, which can be water cooled in the workplace;

(3) With medium wear resistance, carburizing or nitriding processes can also be used to increase its surface hardness, but the heat crack resistance should be slightly reduced;

(4) Due to its low carbon content, the secondary hardening ability is poor in tempering;

(5) H13  has anti-softening ability at higher temperatures, but the hardness decreases rapidly when the use temperature is higher than 540 ° C (1000 ° F).

(6) H13 hasSmall deformation during heat treatment;

(7)H13  has Medium and high machinability;

(8) H13 has Medium decarburization resistance.

Even more remarkable is that it can also be used to make important components in the aviation industry.

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carbon steel is an iron-carbon alloy containing less than 2.11% carbon and containing a small amount of silicon, manganese, phosphorus, sulfur and other impurity elements. The carbon content of industrial carbon steel is generally 0.05% to 1.35%.

As we know, there are many types of steel, let’s talk about carbon steel today. Can you divide the types of carbon steel? Otai will give you the answer.OTAI Steel specialized in the steel industry for over 20 years. OTAI export tool steel to more than 30 countries includes Europe, North America, South American, Middle East, and Asia. OTAI is stable and reliable tool steel supplier for Fortune 500 companies at home and abroad,

Carbon steel is an iron-carbon alloy containing less than 2.11% carbon and containing a small amount of silicon, manganese, phosphorus, sulfur and other impurity elements. The carbon content of industrial carbon steel is generally 0.05% to 1.35%.

The performance of carbon  cable steel is mainly determined by the carbon content. When the carbon content increases, the strength, and hardness of the steel increase, however, the plasticity, toughness and weldability decrease. Compared with other steels, carbon steel has the earliest use, low cost, a wide range of performance, and the largest amount of use. Suitable for water, steam, air, hydrogen, ammonia, nitrogen and petroleum products with a nominal pressure PN≤32.0MPA and a temperature of -30-425 ℃.

Among the various types of steel, carbon structural steel has the highest output, a wide range of uses, and the lowest price. It has appropriate strength, good plasticity, toughness, process performance, and processing performance. , Engineering, grooves, angles, etc.), wire and profiled materials, used to manufacture building engineering structures such as factory buildings, bridges, and ships, generally used directly in the hot rolled state.

Classification of  carbon steel

1. According to the mass percentage of carbon:

• Low carbon steel (C: ≤0.25%)
• Medium carbon steel (C: 0.25% ≤C≤0.6%)
• High carbon steel (C:> 0.6%)

2. According to the quality of the steel (mainly the content of impurities sulfur and phosphorus):

Ordinary carbon cable steel (S s0.055%, P≤0.045%)

Advanced quality carbon cable steel (S≤0.040%, P≤0.040%)

High- quality carbon cable steel (S≤0.030%, P≤0.035%)

3 .According to the purpose.

Carbon structural steel:mainly used for bridges, ships, building components, machine parts, etc. Carbon content-generally of less than 0.7%.

Ordinary carbon structural steel is divided into three categories: Class A steel is a steel that guarantees mechanical properties; Class B steel is a steel that guarantees chemical composition; Special steel is Steel that guarantees mechanical properties and chemical composition.

Carbon tool steel: mainly used for cutting tools, molds, measuring tools, etc. This type of steel is generally high carbon steel.

Are you interested in this? Don’t hesitate to connect with us, I believe that you can always find a lower price, but you can never get the same quality. You get what you pay for.

Mr Jack Tan

Tel: 0086-769-23190193

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The quality of tooling  material（HSS material  or Alloy steel ） is the basic factor, which affects the machining surface quality, cutting efficiency and lifecycle of  tools.  The cutting part of the tools responsible for cutting work directly of tools .it is so important to choose the tool material in reasonable  .

• High hardness and wear resistance

Hardness is a basic characteristic of tool material (HSS material) .The hardness of the cutting tool must be greater than the cutting material .The hardness of cutting edge used in cutting metal is generally above 60HRC.Wear resistance is the ability of a HSS material to resist wear and tear.

• High heat resistance (thermal stability)

Heat resistance is the main indicator of tool materia’sl (HSS material or alloy steel ) cutting performance. It refers to the tool material under high temperature conditions still maintain a certain hardness, wear resistance, strength and toughness . The cutting tool material should also have the ability to resist oxidation at high temperature ，resist bonding and diffusion. So the cutting tool material should have good chemical stability.

• Good thermophysical property and thermal shock property

The better the thermal conductivity of the tool material, the more easily the cutting heat dissipates from the cutting area which helps to reduce the cutting temperature. In intermittent cutting or using cutting fluid. The tool is often subjected to a large thermal shock (temperature changes dramatically), resulting in cracks in the tool leading to fracture.

• Good process performance

In order to facilitate the manufacture of the tool, the tool material (HSS material and Alloy steel ) is required to have good process performance. Such as forging performance, heat treatment performance, high temperature plastic deformation performance, grinding performance.

• Economy

Economy is one of the important indicators of cutting tool material.  Although the cost of high-quality cutting tool material is very high, its long life-cycle, the cost allocated to each part is not necessarily very high. Therefore in the selection of cutting tool materials to consider its economic influence .

Ms Elwa Lee

Mobile/WhatsApp: 0086-15899675236

Tel: 0086-769-23190193

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Email: Elwa@otaisteel.com

China produces over 150,000 tons of high speed steel, the low alloy high speed steel accounts for a big  proportion.The percentage of high performance high speed steel lower than developed countries.It is just starting to the R&D ,and production of powder of high speed steel .

The infomation of High speed steel tools in China

Different cutting tool material with unique advantage and the use scope, and also can replaces by the supplements. The Sales of high speed steel tools going up each year compared with  carbide  alloy tools.

In China market ,The proportion of HSS cutting  tool is relatively large, and carbide alloy tool development rapidly .

The imported cutting tools accounted for 1/3 of the Chinese tools market .Most of them is alloy steel tools ,powder high speed steel ,low-alloy HSS.

In 2018,over 5.2 billions HSS cutting tools, there were nearly 3 billion export to US ,eu with low-price .Most of the item is low-alloy HSS household tools.

The tools imports of China increased from 13.9 billion RMB in 2017 to 14.8 billion RMB in 2018.

It is increase of 6.5% year on year and a record high for two consecutive years. As manufacturing upgrades improve the quality of cutting tools,the market structure for cutting tools continues to change.

At present, Cutting tools are mainly divided into high speed steel , ceramics and superhard materials .

China’s Tools industry status is:

The overall technical level of the cutting tool industry is low. 

The proportion of high-end ultra-hard cutting tool products is low,

The performance quality can not meet the development of high-end equipment manufacturing industry.

And the product category is improving, which compared with the domestic manufacturers, has a strong competitive advantage.

Ms Elwa Lee

Mobile/WhatsApp: 0086-15899675236

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Elwa@otaisteel.com