Category Archives: Blog

In the whole year of 2019 , High Speed Steel M2 Flat Bar have sold well . It is very close to the Chinese Spring Festival , all the company will leave for long term vacation after this week . The best urgent thing was loading the finished cargoes to customer before leave . Almost to Chinese New Year , all the truck triver will leave from the working place back to hometown . In order to companion for his family , they need to enjoy with family in the most important holiday all over the year . And after this holiday , they may leave all the year round in 2020 .

All the situation make the delivery container to aboard very difficult in the period of this time in China . So all the customer will catch up the last two week to loading their contianer urgently . Please pay attention to this situation , and avoid of this busy time . And make balance payment in time , otherwise there is no more time to send out the shipping documents to your hand .

High Speed Steel M2 Flat Bar is molybdenum series high speed steel.Have the advantages of small carbide inhomogeneity and high toughness . Easy to overheating, should strictly control the quenching heating temperature, the more strict protection for heat treatment.

Because of its hardness and wearability, High Speed Steel M2 Flat Bar used in the manufacture of cutting more difficult to cutting tool materials . Furthemore , M2 high speed steel with carbide orientation is bigger . So the more strict protection for heat treatment, is suitable for the mould vibration and shock loads .  Application as Cold forging die, precision die, pressure molding powder, etc., cutting tools, adding glass fiber plastic mould etc . So it is suitable for the mould vibration and impact loads, deep drawing mould, punching die. Metal cutting saw blade, cold heading and extrusion.

My customer from Bulgaria have ordered a container of High Speed Steel M2 Flat Bar and round bar . And the finished time was 14th Jan . We may leave for holiday today . And client order me loading the container before leave . I consult with the shipping agent to booking container very urgently . But no shipping company want to handle this , all the port have  crammed with containers . And all the truck drive have came back to home . The transport have very big problems . We have cost more than double cost to loading the container finally .

In the end of Chinese Lunar Year 2019 , we wish everyone have a happlies and prosperious new year in 2020 . Gong Xi Fa Cai !

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Email: jack@otaisteel.com

42CD4 Plate Q+T, the order continues even the lunar year is coming.

Recently, I can feel the atmosphere of china’s lunar year. Our office locates in Dongguan city, canton province .because our office is in the office building, the lift is limited, we have to wait for the lift every working-day. However, as the lunar year is coming, people are fewer than before. We needn’t wait for the lift .

many company has already closed the door, prepared for their festival. However, our company is arranging for the shipment of 42CD4 Plate Q+T, I wish all of you a happy lunar year.

You can feel the atmosphere even at our office, the window of our office is decorated with craft, the door is decorated with Spring couplet, every household does this for a better coming year. Tomorrow is our last working-day, all members of our company are excited, the long festival is an enjoyable time to gather together with lovely family members.

Spring festival travel rush time

Spring festival travel rush time has already arrived, it reflected in train and bus before. However, with the development of the Chinese economy, almost every family owning the car.so travel rush is obvious in the high-speed. We have to arrange our time avoiding the rush time .it’s real big immigration. In China, the metro city like Beijing, Shanghai, and Guangzhou is popular .it provides more chances for job-seekers, better education.

Otai special steel company is located in Gongguan City, the main industry district. So our customer not only comes from the Chinese mainland but also worldwide. Many customers buy the 42CD4 Plate Q+T from our company, then sold it to other countries.

Otaisteel is a stable and reliable supplier for fortune 500 companies at home and abroad, such as Thyssenkrupp, china north industries group corporation limited. Otai exports various tool steel and alloy steel to more than 30 countries.Like Europe and American, Middle East, and Asia. Our steel materials meet DIN/ ASTM/EN/JIS etc different international standards.

Mr Jack Tan

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In my three years experience work in Otai Special Steel company.most of them are require for Hot rolled black sureface condition.

Not much people take 1.7225 shaft annealed which hardness is less than 22HRC,In my three years experience work in Otai Special Steel company.most of them are require for Hot rolled black sureface condition,but their seldome people do demand the 1.7225 shaft Annealed one,1.7225 also name 4140 in America, 42CrMo4 in Germany, and SCM 440 in Japan.

Applications of 1.7225 steel  material

1.7225 steel is a typical alloy structural steel, Its Mechanical Properties is very nice. So the 1.7225 application range is very widly. DIN 1.7225 can use in gearing, bearing, machinery structural parts, Like Possesses good hardness and high strength, hardenability, quenching deformation of small, high temperature creep rupture strength and high. Used in the manufacture requirements higher than 35 crmo steel strength and conditioning section more large forgings, such as locomotive traction with the big gear, supercharger drive gear, rear axle, the load of connecting rod and a spring clip, can also be used to under 2000 m deep well of oil drill pipe joint and the fishing tool and so on.

Forging of 1.7225 steel material

Preheat slowly to 750°C then increase the temperature more rapidly to 1150-1200 °C. Do not forge below 850°C. Then cool the 1.7225 slowly after forging, cool in ash or lime ,either in a furnace or in vermiculite.

1.7225 shaft annealed

Heat to the 1.7225 steel and Soak thoroughly at 800-850°C before furnace cooling at a maximum rate of 20°C per hour down to 480°C followed by cooling in furnace or air.

Ms Sharon Wan

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H13 STEEL APPLICATION IN LIFE-Chapter7

authors found that an average pulse energy of 30 J mm⁻² –H13 TOOL STEEL was required for continuous track deposition at pulse frequencies between 20 and 90 Hz. The melting of H13 TOOL STEEL  the WC particles in the Co matrix could be controlled by changing the pulse duration. Dense and defect-free multilayer specimens of WC–17 wt.%Co cermet, with microhardness of 1250–1700 Vickers, were fabricated. Dense, crack-free, thin wall specimens of a cermet with 85%WC, 10%Co, 5% impurities were obtained by Xiong et al. (282) using the LENS process. The average hardness of the depositions was about 1300 HV. The authors observed a layered structure in their depositions, which they explained by the coalescence of H13 TOOL STEELthe WC to form large particles, but H13 TOOL STEEL subsequent studies showed that they are due to the formation and remelting of a H13 TOOL STEEL low temperature eutectic in the underlying material (283). Therefore,H13 TOOL STEEL to avoid remelting and the resulting inhomogeneity in the microstructure, the temperature in the layer immediately below that being deposited must remain below the eutectic temperature. The influence of the processing parameters on the microstructure, mechanical properties and wear resistance of WC–12%Co cermets laser-deposited by the LENS process were studied by Balla et al. (284). The results showed that carbide dissolution and carbide particle distribution must be controlled by proper selection of the laser parameters in particular of the laser beam energy. H13 TOOL STEELCoatings produced at 365 and 465 J mm³ presented a hardness of about 1180 HV, H13 TOOL STEEL and a very high dry sliding wear resistance against an Si₃N₄ counterbody (specific wear rate ∼10⁻⁶ mm³ Nm⁻¹).H13 TOOL STEEL

China OTAI Special Steel -H13 TOOL STEEL

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jack@otaisteel.com

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1.7225 Shaft Hot rolled is regularly available in two forms: the most common is tempered, designated simply as 1.7225. While the pre-tempered form is thermally assisted in the foundry and is designated as 1.7225 HT. It is suitable for hardening by heat treatment.

Our OTAI Special steel company supply the 1.7225 Shaft Hot rolled, annealed, Q+T different condition in different shapes. Such as in plates, flat bar, round bar, tubes and hexagon form.We committed to being responsible for each order and each customer.

In fact, everyone should have the grateful heart, people need it, and this society needs it even more. I do always agree with the causal loop between the reason and result. What kind of ways did you do in previous lives? Then the final results that our future generations may have. So I also much agreed with the value of our company has. OTAI  Special steel gives the thanks to every outstanding employee with gratitude. Of course, the most important point is to return to our society. So our company often did his what can do to donate some books and clothes to those poor children in remote area . And we also visited the Nursing home for the elderly and brought them holiday blessings and gifts. So that those people in need can feel the care and warmth of the people and this society.

Therefore, as the always we do for our clients. We provide our service in a very clear and sincere heart. We offered our price in the very competitive one. We shipped the steel material with the guaranteed quality. And we committed to being responsible for each order of each client. We wanted to be the 1.7225 Shaft Hot rolled supplier that customers can rely on.

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The 4140 Plate Annealed belongs to the group of low alloy steels. It is a medium carbon steel, chromium alloy and molybdenum.It is with very resistant to torsion, good resistance to wear and impact, responds excellently to all heat treatments.

Recently, even now it is Winter in Canton province, but the weather is still in average 25 degree. Many people made the joking this winter is hot because of the fire disaster in Australia.

One of our Australian clients shared the info as below, and he purchased the 4140 plate Annealed from us in each two months. And the client is rest assured about the quality we supply. As the 4140 Plated Annealed, which is made by the only one imported steelmaking equipment in China.

The fire that lasted for more than four months in Australia has caused the disappearance of more than one Irish forest. Australia is currently in the summer high temperature season and the local average high temperature exceeds 41 degrees. The Australian government has warned that the fire will not quickly abate.The government calls on residents near the fire-stricken area in eastern Australia quickly left their homes before temperatures rose. More than 2,000 dwellings have been burned. Experts believe that more than one billion animals have been killed in flames across Australia. Australia is the world’s major rare animal habitat. Australia ’s kangaroos, koalas and other rare animals are found all over the world. There is nothing unique. Even if some of them can survive, the natural environment on which they depend has been severely damaged.

Talking about the destruction of this environment, there may be the impact of the above natural environment. But now there are more and more human factors affecting and destroying the environment. For example, the increasing amount of domestic waste causes pollution to our air and water. It causes a vicious cycle of the natural environment. Here we OTAI Special steel call on everyone to protect the environment. As everyone has the responsibility on this. Protecting the environment starts with the every small things around us.

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H13 STEEL APPLICATION IN LIFE-Chapter8

Casting Manufacture-H13 tool steel

John Campbell OBE FREng DEng PhD MMet MA, in Complete Casting Handbook, 2011-H13 tool steel

High-pressure die-casting dies-H13 tool steel

High-pressure die casting is known in the USA, confusingly, as die casting.

H13 tool steel  -Dies for pressure die casting are hardly inert, partly because of  H13 tool steel the gradual dissolution of the unprotected steel die, but mainly because of the overwhelming effect of the evaporation of the die-dressing material. H13 tool steel  may be an oil- or water-based suspension of graphite sprayed onto the surface of the die, and designed to cool and lubricate the die between shots. The gases found in pores in pressure die castings of H13 tool steel  have been found to be mainly products of decomposition of the die lubrication in H13 tool steel  and the volume of gases found trapped in the casting has been found to correspond on occasions to nearly the volume of the die cavity.

A little-known problem is the boiling of residual coolant trapped inside joints of the die. Thus as liquid metal is introduced into the die, the coolant, especially if water-based, will boil. If there is no route for the vapor to escape via the back of the die, vapor may be forced into the liquid metal as bubbles. If H13 tool steel happens it is likely that at least some of these bubbles will be permanently trapped as blow holes (note the correct and rather rare use of the term ‘blow hole’ in this instance) in the casting. This problem of H13 tool steel is common in pressure die and squeeze casting processes.

The recent development in pressure die casting to separate the functions of (i) cooling of the die and (ii) its lubrication,H13 tool steel  is seen as a positive step toward solving this problem. The approach pf H13 tool steel  is to use more effective cooling by built-in cooling channels, whereas lubrication is achieved by the application of minute additions of waxes or other materials to the shot sleeve.

When used for its common purpose of casting aluminum or magnesium alloys the dies are necessarily made from good-quality hot work tool steel, H13. In this case of H13 tool steel  have gray iron would not have the adequate surface integrity because of the presence of H13 tool steel  have graphite flakes in the material, and would not have the strength or fatigue resistance. No protective coating is applied to the surfaces of the die. The result is an excellent surface finish. The danger of cold laps of H13 tool steel  is reduced by extremely rapid filling, and by high pressure that is subsequently applied to ensure faithful reproduction of the profile of the mold. Even so, of course, the high speed of H13 tool steel  filling causes other serious problems that we shall consider later.

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A french friend sent me an inquiry about 42CD4 steel about 2 years ago,I was so confuse at that time

A french friend sent me an inquiry about 42CD4 steel about 2 years ago,I was so confuse at that time,I think I never heard this kind of material.and told him that 42CD4 steel we don’t have.
Lately,I got the inquiry of 42CD4 steel again,but I check the chemical component this time,It’s Din 42CrMo4 similar steel,how stiup i was 2 year ago,42CD4 steel is the french standard,42CrMo4 is the germen standard.I had been this company for 3 year,finnaly I got experience about steel,and this time I sure would do the same mistake,I told the french customer about 42CD4 steel information,and share the stock data with him.

If you want to know more about 42CD4 steel,you are welcome contact me.

42CD4 equivalent material

• ♦America♦ : AISI 4140 alloy steel
• ♦JAPAN♦ : JIS SCM440 alloy steel
• ♦GERMANY♦ : DIN WN-r 1.7255 / 42CrMo4 steel alloy
• ♦CHINA♦ :  GB 42CrMo steel
• ♦BRITISH♦ : BS 708M40Supply Size rangeHot Rolled 42CD4 steel bar: Ø5mm-200mmForging 42CD4 steel bar: Ø140mm-3000mmHot rolled 42CD4 steel plate: Thickness 10mm-200mm x width 100-2300mm

  Forged 42CD4 material steel plate: Thickness 150-1500mm x Width 100 x 3000mm

  Others 42CD4 material have not specified size, pls contact me.

  42CD4 alloy steel Heat treatment

• Annealing
  AISI 42CD4 alloy steel is annealed at 872°C (1600°F) followed by slowly cooling in the furnace.
• Tempering
  AISI 42CD4 alloy steel can be tempered at 205 to 649°C (400 to 1200°F) depending upon the desired hardness level. The hardness of the steel can be increased if it has lower tempering temperature. For example, tensile strength of 225 ksi cab be achieved by tempering at 316°C (600°F), and a tensile strength of 130 ksi can be achieved by tempering at 538°C (1000°F).
• Hardening
  AISI 42CD4 alloy steel can be hardened by cold working, or heating and quenching.

Ms Sharon Wan

Mobile/WhatsApp: 0086-13580960968

Tel: 0086-769-23190193

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Email: Sharon@otaisteel.com

1.7225 Round Bar Annealed, Otai focuses on high-quality steel.

1.7225 round bar annealed, do you know about it? It is common chromium-molybdenum steel. Since last year, we aim to produce a high-quality 1.7225 round bar annealed. Although Otai is not the biggest supplier in China, we believe we can provide a high-quality 1.7225 round bar above the international standard.

When I show a glimpse at the steel news, I notice that the government supports China’s steel industry to focus on high-quality development. We need to improve the quality and efficiency instead of expanding through scale and price competition. The achievements of China’s cutting overcapacity campaign not only benefited Chinese steel companies but also contributed to the revival of the world steel industry, the focus of China’s steel industry should be quickly transformed to upgrading and high-quality development, from cutting overcapacity, which requires higher level of environment protection, better product quality, and ecosystem.

Our company-otai special steel company provides a high-quality 1.75225 Round Bar Annealed. Through the experience of more than 16 years’ development, I believe more and more customers from worldwide will place the order to us in 2020. I hope we have deep cooperation with you during the new year.

Chemical composition

Application of 1.7225 Round Bar annealed

1.7225 Round Bar steel Strength, high hardenability, toughness, and quenching small deformation, high strength and creep rupture strength at high temperatures. Requirements for the manufacture of higher intensity than the 35CrMo steel and tempered forging greater cross-section, such as a large locomotive traction gears, supercharger drive gear, pressure vessels, gear, rear axle, greatly affected by load and spring clip link It can also be used to 2000m deep oil drill pipe joints and fishing tools and can use bending machine mold, etc.

Mr Jack Tan

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H13 STEEL APPLICATION IN LIFE-Chapter 6

As Cu reacts easily with molten aluminum, the presence of copper at the coating surface must be avoided and this requires coating thicknesses larger than 2 mm. Porosity in the coatings was low and the interface microstructure was sound. The authors calculated the solidification time in similar die casting molds consisting entirely of AISI H13 tool steel and with a copper-steel multimaterial construction and showed that the latter architecture allows reducing the solidification time to 1/3 of the solidification time of h13 tool steel  the single-material molds. Taking into consideration the difference of solubility of Cu in the BCC (α) and FCC (γ) allotropic forms of iron, the same authors investigated the influence of a buffer layer of austenitic stainless steel on the microstructure and properties of the H13/beryllium copper alloy interface (276) and concluded that the buffer layer improves ductility and resilience, evaluated by the Charpy impact test, but reduces the interface bond strength and fracture toughness. On the other hand, the presence of the buffer layer improves considerable the thermal fatigue resistance (277). –

Using the tool steel with H13 will be better than more.

Another interesting possibility of multimaterial deposition is the localized application of composite materials in some regions of a tool steel with H13  to improve its surface hardness and wear resistance. This concept of tool steel wtih H13 was developed by Jiang and Molian using a TiC/Ni–17.5Cr–5.5Al–2.5Cr composite (278), and by Vilar and coworkers for Al alloys rapid tooling applications (32,110,111). On the other hand, TOOL STEEL  H13 Vilar and coworkers (279,280) demonstrated the possibility of using variable feed rate laser powder deposition to synthesize in situ variable composition iron-based composites optimized for particular rapid-tooling applications, consisting of a martensitic stainless steel matrix reinforced with NbC.

The most important ceramic-reinforced composites for tooling applications are tungsten carbide–cobalt (WC–Co) cermets with H13 steel . These materials are brittle and thermal shock may result in extensive cracking. Paul and Khajepour (281) studied the effect of processing parameters during multilayer deposition of WC–Co cermets with relatively large cobalt (Co) proportion, to reduce brittleness, on the properties and microstructure of the material. The deposition system was based on a 1 kW average power pulsed Nd:YAG laser.

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