Category Archives: Blog

OTAI supply the grade 4140 widely. Recently we sold a lot of grade 4140 steel plates which is for fulfilling the mould parts. This mould is used on the facemask-producing machine widely.

During the end of Jan to the early of March, China was going through the dark and difficult time because of the virus. There was a lot of fear here. Most of people in Hubei have become infected, and they were isolated from their families and their loved ones. And they have to be alone in the wards.They do not even have a chance to say goodbye when they passed away. Someone chased and run after the ambulance when their loved ones died and was delivered to the cremation. This virus is indeed terrible. It affected the people in different age, no matter elder or younger, healthy and ill.

It seems that we pressed the stop button in our life. All the streets were empty, everybody stayed at home . The virus was rampaging. The numbers were increasing in every day. The rumors were spreading, and the fear is growing. The whole country lost its original vitality and prosperity. But people life are the most important, people are at the heart of our world. So at this time, life means everything. Staying yourself at home and staying safely is the greatest contribution we could do for our own country.

Usually, in the difficult time, someone became the hero, and someone was with the shameful behavior. Some leaders did nothing at that moment, but some normal ones with the very sincere spirit on their devotion. Someone sold the mask in a very high price at this special difficult time. Someone gave the facemask for free. People always say that life is a mirror. Here I would like to say the virus is also a mirror.

At this special moment, we should work as a strong team to overcome the virus and help each other. A friend in need is a friend indeed. These days, OTAI is a supplier who supplies the grade 4140 widely. We for supporting to the customers located in the serious area and country, we do our best to send some facemask to them. Sincerely hope them, their loved-ones, friends and colleagues remain safe and healthy. Lets’s go through the difficult time together, expect our more working together no matter on the grade 4140 but other more steel grades.

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

The improvement of H13ESR steel is an air-cooled hardened hot work die steel with high hardenability

H13 ESR steel is an air-cooled hardened hot work die steel with high hardenability

Toughness and excellent thermal fatigue resistance. It is one of the most widely used hot work die steels in the world today. In service, hot work die materials need to withstand impact loads,and alternating cold and heat, often due to insufficient strength ,and toughness, especially poor lateral toughness, leading to early failure.

Therefore, improving the microstructure of hot work die steel ,and increasing its impact toughness can significantly increase the service life of the die. At present, researches on H13 steel abroad mostly focus on phase transformation kinetics,and heat treatment process, while the research on the effect of forging process on the structure ,and properties of H13 steel is rare.

The researchers selected H13ESR for “one-up, one-draw” and “three-up, three-draw” forging processes. respectively, and made a comparative analysis from the aspects of microstructure ,and impact toughness to provide a certain reference,that for clarifying the choice of  H13ESR steel forging process. The H13 steel ingot used in the test was smelted by the electroslag remelting process. The chemical composition of the steel ingot is as follows:

Chemical composition of  H13ESR steel (wt%)

C: 0.32 ~ 0.45,

Si: 0.80 ~ 1.20,

Mn: 0.20 ~ 0.50,

Cr: 4.75 ~ 5.50,

Mo: 1.10 ~ 1.75,

V: 0.80 ~ 1.20,

p: ≤0.030S: ≤0.030

The initial forging temperature is 1180 ° C, the final forging temperature is 850 ° C, and the feed amount is controlled at 1/3 to 1/2 of the width of the lower anvil. The upsetting ratio is 3: 1, and the total forging ratio is 4: 1.Drawing and three upsetting, drawing. Samples were taken from the core of the steel ingot, and the as-cast microstructure was observed. A 10mm × 10mm × 55mm ,Charpy V-notch impact test specimen was taken at the core of the forging. The test specimen was quenched and tempered, (1030 ℃ for 30min, and tempered twice at 590 ℃ for 2h each time), and then,JB30B impact was used.

The impact test,it was performed on the testing machine, and the shape of the impact fracture,that was observed with a scanning electron microscope,which of JSM-6510 type. After forging the annealed metallographic specimens,it after being corroded by 4% nitric acid alcohol solution, the microstructure analysis ,which was performed with a Leica DM 2700M metallographic microscope.

The results showed that:

(1) Compared with one-up and one-draw, after adopting the three-up and three-draw process, the microstructure of H13 steel is significantly improved, the grain is refined, the band segregation is significantly reduced, the carbide distribution is more uniform, and the material’s lateral impact performance is significant improve.

(2) The improvement of H13ESR steel,it is an air-cooled hardened hot work die steel with high hardenability，steel’s transverse impact performance is mainly,it due to fine grain toughening, band segregation, reduction of crystalline carbides, and more uniform carbide distribution, which weakens the tendency of crack initiation and other factors.

(3) Three pressing three drawing process ,it can significantly improve the structure of H13 steel ,and improve the impact performance. Therefore, three-pronged three-pronged is superior to one-pronged one.

Ms Sharon Wan

Mobile/WhatsApp: 0086-13580960968

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Sharon@otaisteel.com

30CrNiMo8 steel, Otai has the diameter 20-130mm in storage.

Except for the 42CrMo steel, the 30CrNiMo8 steel is also a key product of Otai company. We have storage in our factory.

We talked a lot about 4140 steel before, discuss the 30CrNiMo8 steel little. Today, I want to share some information about 30CrNiMo8 steel with you.

Otai provides the 30CrNiMo8 steel round bar. The diameter is 20-130mm. It is equivalent to 4340 steel.

we have many clients in South America, they are very interested in 30CrNiMo8 steel, and once order, try again. we have a good relationship with our clients.

Applications of 30CrNiMo8 steel

Alloyed heat treatable steel with a typical tensile strength of 1100 -1300 N/mm². Used for highly stressed components, where the combination of high strength with tenaciousness is of utmost importance. High cold formability: Parts of different shapes can be manufactured, a very good surface condition and a high dimensional accuracy. When cold formed the smooth surface leads to increased fatigue and vibratory strength. 30CrNiMo8 steel is an Alloy Structural Steel belongs to ASTM A29/A29M Steel Grade standard. 30CrNiMo8 steel is used in the Oil and Gas industry and Large Machinery Structural. Otai provides cutting, sawing, milled, machining processing.

The news of the pandemic is updating every day, we hope it will be end soon. the trend of the pandemic abroad is similar to china .however, after the fight with it for about two months,we finally control it .we We hope we will be united together, and the normal life will come soon. To reward our dear customer, Otai company sends a lot of masks abroad, we hope everything will be better soon.

Mr Jack Tan

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

Tool steel m2, Otai provides it all year round.

High-speed steel is widely used in our daily life, it is used for cutting tool material or drill. There is a lot of high-speed steel, such as m6,m42,m35. I would like to talk about m2 with you. Tool steel m2, Otai provides it all year round.

To sever the customers better, Otai company devote to introduce new technology and new machine. Recently, my company bought a new vertical sawing machine for fulfilling the 4140 steel bar cutting. We can provide carbon steel, alloy steel, and tool steel. The quality is assured.

Tool steel M2 steel is Tungsten-Molybdenum high-speed steel, which has the advantages of small carbide non-uniformity and high toughness. It is easy to overheat, so the quenching heating temperature should be strictly controlled, and the heat treatment protection requirements are strict. Due to its hardness and wear resistance, it is often used. For the manufacture of cutting tools that are difficult to cut materials. Tool steel has a large tendency to carbide, so the heat treatment protection requirements are strict, suitable for the mold to withstand shock and impact loads.

Tool steel M2 is known for its balanced combination of abrasion resistance, toughness, and good red hardness. it is tungsten-molybdenum high-speed tool steel, m2 tool steel is used in a variety of applications and worldwide. M2 tool steel is the most popular high-speed steel because of its superior qualities. As a result of its low carbon content, M2 tool steel high-speed tool steel has an outstanding combination of toughness properties and abrasion resistance when correctly hardened and tempered.

Application of Tool steel M2

Suitable for manufacturing various strong cutting tools with wear-resistant, resistant to impact. Advanced punching dies, screw dies, the toughness and complicated shape of the punch, etc. Roll cutting tool industry: scraper, serrated knife, iron knives, drill bits, etc.

Forging industry: forging die.

Screw industry: heading forming mold, such as teeth, punch.

Mr Jack Tan

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

1.2379 Annealled Plate is a high carbon-high chromium alloy tool steel that offers great wear and abrasion resistance, due to the large volumes of carbides in its microstructure. It is widely used in long production cold work applications requiring very high wear resistance and high compression strength. 1.2379 Annealled Plate tool steel is machinable in its annealed condition, and like other air hardening tool steels, shows minimal distortion when treated with heat. 1.2379 Tool Steel is available in rounds, flats, and squares, as well as ground flat stock and drill rod.

 1.2379 Annealled Plate tool steel China Supplier and stockholders . Otai Special steel is Supplier  of 1.2379 Annealled Plate steel in round bar,  flat, plate, block and sheet.

 1.2379 Annealled Plate Tool steel Chemical composition

1.2379 Annealled Plate tool steels used for cutting, shaping and pruning is dead, gauge . longitudinal cutting knife, wearing parts, the texture is dead, thread rolling, drawing die, the rotary die cutter . knurling, bending modulus, gauge, the shear blade, polishing tools, volume . machine parts and control parts, injection screw and prompt components, sewing, extrusion die, tire shredder, etc.

1.2379 Tool Steel round bar and flat sections can be cut to your required sizes. D2 tool steel ground steel bar can also be supplied, providing a high quality tool steel precision ground tool steel bar to your required tolerances. D2 Tool Steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes.

When 1.2379 steel material is heavily machined, ground machined or otherwise subjected to cold work, Internal pressure relief Suggestions before hardening to reduce the possibility of distortion. the stress relieving is must.  For stress relieve, heat the D2 steel component to 600-650°C(1112-1202°F). Confirm soak uniformly, then cool it in the heat treatment furnace or Cool in air.

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

4140 steel plates, as our hot selling steel quality items in our company, it is ranked in Top 1 in the sales quantity in last year. And most of customers request to make the 4140 steel bar through cutting the steel plates.

So for supporting most of customer’s fast delivery date and the quality, our company bought this new huge vertical sawing machine. This Monday, the machine was delivered back and assembled perfectly in our warehouse. And the speed on the cutting and efficiency is double than the normal vertical sawing machine. When cutting the 4140 steel bar,, we did not suggest to make the flame cutting. In our sides, we usually use the vertical sawing machine for sawing cutting. In this way, the quality will be very stable.

And we are the largest stockiest in south China for this 4140 steel plates, now in everyday, our warehouse is keeping daily 1000Tons for fulfilling customers’ request. Welcome all the customer friends for asking for any inquiry for the 4140 steel bar.

And nowadays, all of us from all over the world is facing the dark time owning to the rampaging virus. The numbers are increasing in every day, even now Chinese situation is much better and improved compared the status of one month ago. But when seeing the serious country, like Italy and Spain, it seems that it is not easy to end up in a fast way and short time. At this special moment, this is a virus war without guns, bombs or smoke. We are all fighters now. This is team working for all over the world. We shall fight against the fear. We shall fight against the selfishness. We shall fight against the rumors and discriminations. This is a fierce and cruel war, but do not be afraid, we definitely are going to win this war together in the end. Come on, everyone. Fighting, everybody.

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

Everyone all over the world is facing a difficult time right now because of the spreading virus. And MASK becomes everyone’s necessity. Even our company is for the steel material business, even we could not help to produce the mask. But we are doing our best to produce the mould parts which is used on mask-producing machine. This mould part is made by the 4140 plate in 41mm and 45mm thickness.

Now 4140 plate is our company hot selling items, our company makes the finished products by using our stock 4140 plate material. And the workers in our factory work over time every day for rushing on this. Hope it is very helpful for supporting the Mask-producing mill.

And about one month ago, China was going through the extremly difficult time owning to the virus was rampaging in Wuhan and Hubei Province. I was really touched when I hearing the news report about most of the people did their best to help and support that heavy area. I could see such strong team-working power very impressively.

Everyone was doing their best to fight with this virus war together. Someone from overseas bought many masks to deliver it to China. Some people even are poor but they donated the only money to Wuhan and Hubei people. The doctors and nurses were working date and night. No matter how exhausted and dangerous it is. And at the New Year’s Eve, most of the common workers went to Wuhan for building the temporary hospitals very rapidly. More and more doctors and nurses from different provinces help to support the different cities in Hubei. For reducing the wastage on the protective suit, they even did not drink the water as possible. They put a diaper on themselves for avoiding taking off and wasting the suit. We are moved because of such lovely people, we are lucky to have such brave people to protect us.

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

1.2311 Sheet Plate 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 Sheet Plate perfect for mould use . 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. 1.2311 steel is most widely used to plastic mold material in injection plastic mould.

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.

Chemical composition of 1.2311 plastic mold steel plate

DIN 1.2311 tool steel, 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.

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

42CrMo4 Sheet Plate for Mould on FaceMask Machine . OTAI Special steel provide any size of 42CrMo4 raw material use for mold on Mask Machine . As the coronavirus infection all over the world , and we need facemask to protect ourselves . And we need more Mask machine to produce more facemask . China as the One of the global manufacturing powers . We have an obligation to help fight the epidemic globally .

42CrMo4 Sheet Plate for Mould on FaceMask Machine .

42CrMo4 Alloy steel material stockholders and suppliers from China-OTAI SPECIAL STEEL . We have more 16 years experience in 42CrMo4 steel plate, round bar, flat bar, square bar supply . 42CrMo4 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 42CrMo4 alloy steel.

42CrMo4 alloy steel material is a high quality Quenched and Tempered Alloy Structural steel . It belongs to the high quality medium carbon alloy steel, Oil Quenched & Tempered Hardenss is 28-34 HRC. 42CrMo4 Annealing delivery hardenss less than 250HB . 42CrMo4 raw materials is Perfect for mold making . 42CrMo4 Sheet Plate for Mould on FaceMask Machine for  Mask Production .

42CrMo4 sheet plate equivalent material

• ♦JAPAN♦ : JIS SCM440 alloy steel
• ♦GERMANY♦ : DIN WN-r 1.7255 / 42CrMo4 steel alloy
• ♦USA♦ :  AISI4140
• ♦BRITISH♦ : BS 708M40

3. 42CrMo4 alloy steel Chemical composition

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

4140 steel provider OTAI shares the steel news with you.

Nowadays, we can find the pandemic affect every aspect of society .however, as a member of 4140 steel provider OTAI company, I ‘d like to talk about what influence it causes to the steel industry.

4140 steel provider-OTAI, supplies a wide range of 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. After almost 20 years of development and growth, Otai Steel becomes one comprehensive special steel factory.  Although the epidemic isolates the people, however, it can’t isolate the service.

4140 steel provider OTAI shares the steel news with you.

Coronavirse as a “global pandemic”. The complexity and diversity of national governance and the region have brought many uncertainties to the epidemic prevention and control.  The global steel industry is facing a more complicated situation.

The hardest-hit areas of the epidemic contain 8 contries. They are China, Italy, South Korea, Spain, Germany, France, and the United States. Mainly look at the impact of the severely affected areas on the global steel industry.

The linkage between the steel industry and the economy can be considered from three aspects.

The first is relevance to the local economy. This can be simply observed by the ratio of apparent steel consumption to GDP. The larger the ratio value, the greater the proportion of industry in economic activities. the greater the impact of economic growth on steel. China and South Korea are significantly higher than the global level, and the local economy is strongly related to steel.

The second is the relevance to global trade, which can be observed by the scale of imports and exports. In 2018, the 8 countries’ contribution to the global steel trade was 70%, and the global trade of steel in 8 countries is intertwined. The outbreak of the epidemic will most likely harm the global steel trade.

The third is the relevance to indirect import and export products. Part of the steel is directly exported, and another part is through the import and export of finished products. such as steel products for mechanical and electrical, automotive, and home appliances. the impact of the epidemic on the steel industry in eight countries will have a significant impact on many industrial supply chains.

Generally speaking, the steel industry is very important in the global economy and supply chain system. The hardest-hit areas matter a lot, and the impact of the epidemic will have a profound impact!

Mr Jack Tan

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com