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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.

WhatsApp: +86-769-23190193

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Email: Jack@otaisteel.com

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

Fax: 0086-769-88705839

Email: jack@otaisteel.com

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

Fax: 0086-769-88705839

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

M35 High Speed Steel can get high hardness (HRC67-70) after heat treatment process, The hardness (625 ℃ for 4 hours and HRC63 ~ 65), and M35 high speed steel with high wear resistance,toughness and bending strength ,it can avoid the mold edge collapse and reduce early damage such as cracks. it is suitable for manufacturing various kinds of tools for strong cutting,such as wear-resisting and impact-resistant tools, advanced punching dies,screw dies.

Chemical composition (%) :

C 0. 80-0.85, Si 0.20 – 0.40, Mn 0.20-0.40, Cr 3.90- 4. 40, Mo 4.75 -5. 25, V 1.75 -2. 15, W 6. 15- 6. 65, Co 4. 75- 5.2

Equivalent grade of M35 High speed steel ：HITACHI standard –YXM4, SKH55, DIN Grade S6525, AISI/SAE M35.

The Properties of M35 high speed steel mold :

• High abrasion resistance,
• High pressure resistance,
• Sintered resistance
• With longer lifecycle

M35 High Speed Steel Delivery Condition and Hardness :

• Annealed, hardness 269HBS,
• Cold drawn hardness 285 HBS,
• The Hardness after Cold drawn, hardness 277HBS.

Temperature of Heat treatment

• Heat treatment : Temperature -1040~1150℃, and the finished temperature is 930℃.
• Annealed : Temperature 870-900℃,The hardness after annealed : 235-369HBS
• Quenching and Tempering:

1. Preheating Temperature: 732~843℃;
2. Quenching : salt bath furnace: 1204℃; controllable furnace: 1216℃; Quenching medium: oil, air cooling or salt bath;
3. Tempering temperature: 540 ~600℃; hardness: 60HRC after tempering

M35 High Speed Steel Applications :

Cold forging dies, stretch dies, cutting tools, etc.

Ms Elwa Lee

Mobile/WhatsApp: 0086-15899675236

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Elwa@otaisteel.com

1.2344 Round bar (also known as AISI H13 steel ) is a tool steel grade standardised for hot working. The main feature of this grade is the combination of alloyed elements of chromium, molybdenum and vanadium, Cr-Mo-V, which provides a high wear resistance to thermal shock. It is well known as for its great strength, and heat resistance. It is heavily used for die casting in the cold heading field. The presence of high vanadium in DIN 1.2344 can handle the abrasion at both low and high temperatures. It always provides a uniform and high level of machinability. This tool steel is mostly used for aluminum, magnesium and zinc die casting.

1.2344 Round bar , AISI H13, stands for American Iron and Steel Institute. Also it was standardised as SKD 61 by Japanese Industrial Standards.

The surface can be nitrided to improve wear resistance .

1.2344 Round bar is widely used in various places in both cold and hot working. In hot work processing DIN 1.2344 shear knives and dummy block extrusion can be used. In cold work process this steel is used for punching, heading and inserting of die blocks. DIN 1.2344 is a high hot-wear resistance and great strength, warm conductivity air hardening and invulnerability to hot cracking. It has a great resistance to abrasion at each low and high temperature due to the presence of high vanadium. The high level of toughness and ductility made it a useful material for die casting in the cold heading field.

1.2344 Round bar and flat sections can be cut to your required sizes. 1.2344 ground steel bar can also be supplied, providing a high quality tool steel precision ground tool steel bar to your required tolerances. 1.2344 Tool Steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes.

Ms Monica Yu

Mobile/WhatsApp: 0086-13711903397

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Monica@otaisteel.com

Saudi Arabia friends purchase 42CrMo4 steel

Saudi Arabian friend purchase 42CrMo4 steel

In April, Otai Steel and Saudi Arabia signed a bidding contract for the use of Otai 42CrMo4 steel. This project was carried out by one of our Asian clients and ender user is a bidding project in Saudi Arabia. This project will last for 3 years. Our customers have won tenders for the materials 42CrMo4 steel and 1045 steel. The specification of 42CrMo4 steel we supply is Φ55mmΦ210mmΦ230mm. In the first stage, they ordered us 9 containers, divided into 3 batches of 3 containers each. Each batch requires SGS on-site inspection. The inspection standard is EN BS 10343-2009. We completed all 3 batches in November this year, and each batch passed the SGS inspection and fully complied with EN BS 10343-2009 standard.

Experience about 42CrMo4 steel SGS inspection report

The SGS report authoritative organization proves that our materials do not have any quality problems in line with European standards. We provide Chinese prices and European quality. For customers who have questions about the quality of Otai materials, I will share this series of SGS reports with them.

Ms Sharon Wan

Mobile/WhatsApp: 0086-13580960968

Tel: 0086-769-23190193

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Email: Sharon@otaisteel.com

1.2738 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.

1.2738 steel is mainly used for processing and production of hot work molds. Among them, plastic molds are the most common .It is suitable for molds requiring high smoothness such as production of hard rubber (PS) and ABS. It is suitable for large-scale, especially thicker than 400mm plastic molds. This plastic molds require uniform hardness, high toughness and good surface polishing performance. For example like large-scale molds for household appliances, TV casings, photocopier casings and instrument panels.

Some customers focus on the cost, they may purchase the not good 1.2738 steel, which results in the following problems.

The mold steel has many impurities and often encounters sand holes, cracks and pits, and the mold cannot be polished.

The hardness is not uniform, the CNC computer gong processing is difficult to walk. The machine is injured, the processing is difficult when drilling and tapping especially when deep hole drilling is used to process the water delivery hole.

When processing large molds, the hardness of the surface and the core is inconsistent, and the mold is easily deformed, which causes the mold to open and close erratically.

When high pressure injection, the mold is easy to collapse, and there are many plastic products. As a result, the life of the mold is short and the maintenance cost is high.

The 1.2738 steel provided by OTAI has good microstructure density, high hardness and uniformity, and smooth milling. The material has high purity and good mold polishing.We are the very valuable and trustable supplier who supplied for the Thyssen Krupp and Chinese ordnance industry group. We have our own creating technique through this more than 20 years rich experience.

Ms Phoenix Li

Mobile/WhatsApp: 0086-13925830813

Tel: 0086-769-23190193

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Email: Phoenix@otaisteel.com

OT718H mould steel is a vacuum-melted chromium-nickel-molybdenum alloy steel, which has been quenched and tempered before leaving the factory.

OT718H mould steel has excellent polishing performance and photolithographic properties. It also has high hardenability, good electrical workability and skin texture workability. Pre-hardened steel can be used in the mold cavity without quenching. The flange can be flame hardened, which can increase the hardness to 52HRC.

Fake OT718H mold steel has many harmful impurities and poor polishing properties. It is resulted in poor appearance of plastic products and reducing the grade of plastic products.
Inferior OT718H material has poor purity, many harmful impurities, and unstable steel structure. The instability of the mold size causes the dimensional accuracy of plastic products to decrease. It requires frequent mold repairs, increasing maintenance costs, and reducing product quality and production efficiency. The mold steel alloy is unevenly distributed. The local hardness deviation is large, which resulted in insufficient mold wear resistance. the mold is easy to collapse, and the plastic products have more burrs. It is necessary to periodically weld and repair the mold, and increase the labor of deburring. If it is used for large molds, the mold is deformed severely after processing. That will cause the mold to open and close smoothly.

Application of OT718H mould steel:
1) Large plastic molds such as home appliances, computer shells and other molds.
2) High surface finish plastic molds, such as telephones, speakers, PMMA, etc.
3) Plastic molds with a long-life production capacity of more than 500,000 molds.
4) Due to its high hardness, it can be used for wear-resistant parts such as sliders, inserts and rows of plastic molds.
5) Forming tool, compression-brake die (wan plate machine die), (flame hardening or nitriding treatment can be applied according to production needs).

Our OTAI special steel Cut down 20% composite cost for distributor, and fix miscellaneous difficulties for end user.With over 20 years’ pre-sales and after-sales special steel, we help distributors and end users to avoid all possible swindle and cheat.

Ms Phoenix Li

Mobile/WhatsApp: 0086-13925830813

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Phoenix@otaisteel.com