Category Archives: Blog

Do you know about the 8620 steel?  Its common process is as following:

Forging → normalization → normalizing or annealing (preparing for later) → rough machining → semi-finished product processing → carburizing or carbonitriding and quenching → tempering.

By studying the normalizing process system of 8620 steel, it can be seen the isothermal and air cooling time of the normalizing process will impact on the final structure and properties. The quality of the structure also directly affects the performance of the sample. The grain boundaries are not clear. It is known from experiments that the microstructure transformation is incomplete because the isothermal time in the isothermal furnace is not long enough.

The Ni content in the 8620 steel is half that of the 20CrNi steel. The addition of a small amount of Mo causes the upper part of the austenite isothermal transformation curve to move to the right. And because the Mn content is appropriately increased. The hardenability of this steel is still good and the strength also higher than 20CrNi steel. Commonly used in the manufacture of small and medium-sized cars, tractor engines and gears in transmission systems. It can also replace 12CrNi3 steel to manufacture carburized and cyanide parts that require high core performance. Such as roller drill bits for oil drilling and metallurgical surface mines tooth claw and cone body. 8620 steel because of containing molybdenum, in addition to having a good comprehensive performance. It can withstand a certain temperature. Forged gears and rotors of internal combustion engines for steam turbines.

We are the professional supplier for 8620 steel and other special steel. We could supply it in different shapes, say plates, flat bar, round bar, hexagon and seamless tubes. And we could lower the 20% product cost for the distributor and solve all kinds of complicated problems for end buyer.It really is not easy to find the trustable and reliable supplier in such complicated market. But if you do have already, why not to add one more for back up selection? You will be happy to find us here as we are special in this steel field for more than 20years. We are proud on our creating technique through our company’s rich experience.

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

D2 Tool Steel make for knife . D2 Tool Steel is a versatile high-carbon, high-chromium, air-hardening tool steel that is characterized by a relatively high attainable hardness and numerous, large, chromium-rich alloy carbides in the microstructure. These carbides provide good resistance to wear from sliding contact with other metals and abrasive materials. Although other steels with improved toughness or improved wear resistance are available, D2 provides an effective combination of wear resistance and toughness, tool performance, price, and a wide variety of product forms.

D2 Tool Steel make for knife , AISI D2 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. D2 tool steel is machinable in its annealed condition, and like other air hardening tool steels, shows minimal distortion when treated with heat. D2 Tool Steel is available in rounds, flats, and squares, as well as ground flat stock and drill rod.

D2 Tool steel Chemical composition

D2 Tool Steel make for knife , D2 Tool Steel Material Application
AISI grade D2 tool steels are used for long run tooling applications, where wear resistance is important, such as blanking or forming dies and thread rolling dies.

Some main applications for D2 tool steel are as below:

Blanking Dies, Forming Dies, Coining Dies, Slitting Cutters, Heading Tools, Long Punches, Forming Rolls, Edging Rolls, Master Tools, Beading Rolls, Intricate Punches, Extrusion Dies, Drawing Dies, Lamination Dies, Thread Rolling Dies, Shear Blades, Burnishing Tools, Gauges, Knurls, Wear Parts.

We usually hold D2 tool steel on sale activities, and you would have our price on regular schedule. Contact us and sign in our newsletter to have D2 tool steel materials price list and commercial quote today.

Ms Monica Yu

Mobile/WhatsApp: 0086-13711903397

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Monica@otaisteel.com

Otai Special Steel Supply D3 Tool steel in Round bar, Plate, Flat bar, Square, Forging Ring, and others any shape. And provide cutting, sawing, milled, machining processing.

AISI D3 steel belongs to the tool steel, D3 is an oil hardening, high Carbon/ Chromium type steel with very high wear resistance. It hardens with a very slight change in size. The alloy possesses very high compressive strength and is deep hardening.

Otai Special Steel Supply D3 Tool steel in Round bar, Plate, Flat bar, Square, Forging Ring, and others any shape. And provide cutting, sawing, milled, machining processing. Frankly speaking, we receive an inquiry about the tool steel every month,d3 steel is a good choice.

AISI D3 steel is used in tooling applications requiring a high degree of accuracy in hardening, such as draw dies, forming rolls, thread rolling dies, cutting knife, powder metal tooling and blanking and forming dies.

We have a customer from middle east, he bought the AISI d3 tool steel from our company, as a big manufacturer of the cold roll, color coated & galvanized sheets & coils. He bought the d3 tool steel for our Galvalume line. He sent the inquiry to us and sent the details of the requirement to us. After negotiated with the customer, he finally ordered the product. We have customer worldwide, maybe you are the next one, don’t hesitate to connect with us if you need the d3 tool steel.

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 from Europe and American, Middle East, and Asia. our steel materials meet DIN/ ASTM/EN/JIS, etc. different international standards. We have more than 20 years of experience in pre-sales and sales of d3 mold steel. The daily inventory is sufficient.

Mr Jack Tan

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

1.2379 steel equivalent Cr12MoV, is China standard cold work tool steel. Cr12MoV is equivalent for DIN 1.2379, AISI D2, JIS SKD11, and grade K110. Many customer purchase Cr12MoV as 1.2379 steel equivalent, main reason is Cr12MoV have similar chemical composition and performance, but price is much cheaper. This article will explain the reason step by step.

Last article we explain the reasons why people chose 1.2379 steel equivalent Cr12MoV. Let’s continue.

More reasons why chose 1.2379 steel equivalent Cr12MoV

1. China standard steel quality is good, and qualified at most condition to use 1.2379 steel equivalent D2, SKD11, K110. Manufacturing standard is GBT1299-2000YB, from big mill, which is guarantee of stable quality.

2. Some customer require very high performance, then consider ESR process, price still be much cheaper than other 1.2379 steel equivalent

Asia Customer’s application for 1.2379 steel equivalent Cr12MoV

OTAI Special Steel visit north Asia at October, 2019. We visited our old friend in Moscow who continuous purchase OTAI Cr12MoV during this trip. This is a big tooling knives factory. We visited their workshop and finished products. They will established a new factory next year, so we mainly discussed the business expand plan. Customer require OTAI Steel guarantee supply capacity and stable quality as before. Our engineer also provide his suggestion for heat treatment work in their plant.

North Asia customer use 1.2379 steel equivalent Cr12MoV produce three series tooling knives

• Knives for rotary crushers: This kind knives consume a lot of Cr12MoV steel, both in China and other Asia countries.

• Wood processing knives

This group knives is very suitable to use D2 steel equivalent Cr12MoV

• Knives for rubber and plastic

OTAI Special steel focus on special steel industry above 20 years. Our professional engineer always provide our customer most suitable technique proposal. If you are purchasing material D2, 1.2379, SKD11, K110, you can contact us for a trail. It is good option for you to consider China standard 1.2379 steel equivalent Cr12MoV.

Ms Susie Li

Mobile/WhatsApp: 0086-13826999755

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Susie@otaisteel.com

D2 steel equivalent Cr12MoV, is China standard cold work tool steel. Cr12MoV is equivalent for DIN 1.2379, AISI D2, JIS SKD11, and grade K110. Many customer purchase OTAI Steel supplied Cr12MoV as D2 steel equivalent, main reason is Cr12MoV have similar chemical composition and performance, but price is much cheaper. This article will explain the reason step by step.

Cr12MoV chemical composition comparison with D2, 1.2379, and SKD11

Below tables show D2 steel equivalent chemical composition for each grade, most composition is very similar, Mo and V contents have more or less difference for different grade. Hardness after annealed is the same.

The reason to use D2 steel equivalent Cr12MoV

1. Mechanical performance for Cr12MoV and other D2 steel equivalent are similar.

Under the same manufacturing process, if chemical composition similar, the mechanical performance is also similar. OTAI Cr12MoV is directly supply by top three China mill, strictly follow standard GBT1299-2000YB

2.Price for Cr12MoV is much cheaper compared other D2 steel equivalent 1.2379, SKD11 and D2

Generally speaking, Cr12MoV price is cheaper 1300-1800$/Ton compared D2 and 1.2379. If your final product can use Cr12MoV, can save huge cost.

3.Cr12MoV is the most widely used cold work tooling steel in China, usage is huge, more often used than other D2 steel equivalent

In China, we use Cr12MoV to make knives, cutting tools, just like in the United states, use D2, in Europe use 1.2379. Similar application can use similar material of course, so normally used tooling steel in China also can normally used in worldwide, but the time is accept might be very long. To change people’s mind is not easy job.

To be continued……

Ms Susie Li

Mobile/WhatsApp: 0086-13826999755

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Susie@otaisteel.com

1.2714 Tooling Steeel :

Material properties 40 HRC pre-hardened standard grade suitable for hot work tools and for the plastic mold industry. High resistance to wear, high toughness, good polishing properties.

1.2714 tooling steel applications Forging dies, hot shear knives, hot punching tools, die holders. Plastic injection or compression mould cores and cavities, large – size moulds with high quality finish, compression dies under high mechanical and thermal stresses. Thermoplastics (PE, PS, PP), LFT, thermosetting plastics, ABS, transparent melts.

A German customer sent an Inquiry of 1.2714 tooling steel to us ,the list as follow :

• W.1.2714 hot rolled, +QT to max 380 HB, bar end sawn cut, 2 sides as rolled.
• Thickness:20-30-40-50-60-70-80-90-100-110-120
• Width: 800 -1150mm
• Length: 3000-4000 mm
• Each thickness 2 tons

We did not win the offer because size and MOQ unworkable .

For the 1.2714 tooling steel material, there is rare stock of hot rolled ,thickness 50-120mm in the inventory market .

If arrange  hot rolled new production ,MOQ : 100 tons each size ,an order MOQ 300 tons which suitable .Customer t can not meet the MOQ .

For forged new production , There is only  the state mill such as Baosteel / Dongbei steel ‘s machine can produce   Max width 810mm

• MOQ : 20 tons each size
• Price higher 40%than market price
• Leadtime will follow their production line’s schedule (more than 3 months )

It is also impossible for the 1.2714 RFQ .

If we arrange the order to Small and medium forged house, their forging equipment only support to producing width Max 610mm .Their Forged hammer like the photo,it  can not forged the width 800mm by one time ,It need to forged it again and again, the edge will warped up,but not smoothly.especially for the thin thickness 20-40mm ,it is too thin to arrange forged .

We suggest customer  change the width  810mm as 610mm , he think it is unworkable for them ,and they ordered 1.2714 tooling steel from local market again finally .

Ms Elwa Lee

Mobile/WhatsApp: 0086-15899675236

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Elwa@otaisteel.com

I sell H13 material to different countries, different cities, the Middle East, South America and so on, but some customers who are very well with me asked, why I consult the prices from several suppliers. The price of H13 can be such different.

I sell H13 material to different countries, different cities, the Middle East, South America and so on, but some customers who are very well with me asked, why I consult the prices from several suppliers.

The price of H13 material can be such different. The quotations of several suppliers, there are $500-800  / ton difference. I explain to him that, when purchasing H13 in China, if you need to compare prices, the first is, whether the prices are compared at the same time ?how long of the validity period of quotations? Because H13 contains the alloy elements vanadium and molybdenum, vanadium accounts for 0.80% ~ 1.20%, and molybdenum accounts for 1.10% -1.75%. In China, the price of precious metals fluctuates.

Once the precious metals have risen, H13 material will definitely increase a lot during that period. On the contrary, if the alloy elements chromium, vanadium, and molybdenum all fall, H13 during that period also decreases. It will follow the decline, but this is very important point when purchasing, Do you have the confidence to grasp the perfect timing?I guess no one can sure one thing, the Chinese alloy market will up or down.

Frankly speaking,so when purchasing, it depends on whether your company can afford the current H13. Price, if the price is still acceptable, I recommend purchasing as soon as possible. Of course, if there is a lot of material in stock, and ensure that in the next six months to one year, your factory’s orders will not be affected by the rise in precious metals, then the purchaser could wait and see.

Which level of mill?

In China, there are thousands of factories can produce H13 material. Most people recognize DongBei Brand,But,be careful,there are many “DongBei”in internat,the names looks similar,but there are not from the real “DongBei” steel factory. And the smallest ones are those with only a small steelmaking furnace. The machinery and equipment are relatively crude and very old. The factory environment is crazy poor, and the quality is unstable&unacceptable. Therefore, the price difference of one ton is $ 500-800, It is possible at all.

Some of the purchases ,they are not engineers, and they don’t understand the technology well, but their companies are well-known , also their quality is very well-known in the industry. I would recommend purchaser to stake from some state-owned enterprise . Although the price seems uncompetitive, for the end user, the price of this raw material do not affect the product cost much, and it the H13 die could be used longer than other factories, and the quality is guaranteed.

There is no best steel,but there is most suitable one,which level is good for yours？

Ms Sharon Wan

Mobile/WhatsApp: 0086-13580960968

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Sharon@otaisteel.com

M42 steel is a high-cobalt high-speed steel. It is mainly used for high-toughness precision wear-resistant hardware cold stamping die. The steel has high hardness, up to 70HRC, good thermal rigidity, high temperature hardness and easy grinding.

The W2Mo9Cr4VCo8 steel code is M42. It is a U.S. grade superhard cobalt high-speed tool steel. The mass fraction of vanadium in M42 steel is not high (1%), and the mass fraction of cobalt is high (8%). It is mostly dissolved in the matrix and uses high matrix hardness to improve wear resistance. The steel has good hardness, hot hardness, abrasion resistance and grinding properties. The heat treatment hardness can reach 67 ~ 70HRC, but there are also special heat treatment methods to obtain a hardness of 67 ~ 68HRC. This can improves its cutting performance (especially intermittent cutting) and improves impact toughness.

Characteristics of M42:
1.It is with high red hot hardness.
2.High wear resistance and cutting ability.
3.High impact toughness, fine and uniform grain, high toughness.
M42 application:
It is suitable for manufacturing various abrasion and impact resistant tools for powerful cutting. Advanced dies, screw dies, punches that require toughness and complex shapes. Tool industry: scraper, hobbing knife, iron knife, drill, etc.Forging industry: forging die.

Our OTAI is the Chinese supplier and stockholders for M42 High speed steel. We could supply it in round bar, plate, flat, square and hexagon shape. We are the very valuable and trustable supplier who supplied for the Thyssen Krupp and Chinese ordnance industry group. We exported the special steel to more than 30 countries all over the world for more than 20 years already, and they are passed the standard of America, Germany and Japan.

Ms Phoenix Li

Mobile/WhatsApp: 0086-13925830813

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Phoenix@otaisteel.com

Otai focus on alloy steel business over 20 years ,we do our business trip to visit customer or new oversea market each year in recently 5 years .

We got a feedback from a customer that : you visited my customer as you coming to our market ,and our customer use you own price to let us cut down our cost .it is hurt for our us  .I was deeply touched on the feedback .

We aimed at knowing the market better by steel business trip to customer .

We know customer better ,and then set up long-term &stable cooperation with 1-3 customers,but not sell our alloy steel  to each customer directly .

–Otai do the wholesale service of mold steel & Alloy steel .

–Otai focus on long-term & win-win cooperation of steel business .

–Otai in accordance with the principle of prudent operation,and will visit and follow customer feedback by business trip.

–Otai aim at stable partner-customer, but not sell to each customer ,The order ,the more the better ;The customer ,the more professional ,the better .

For the steel business trip to alloy steel market , it is a long-term direction combined with Otai’s business model. However ,the purpose is to know the market well, but not looking for each customer for cooperation.

Seller choose cooperated partners same as  buyer choose their suppliers .

Just like customer will choose their suppliers, we also choose the customer according to our business model. There is more than 20 suppliers in customer’s supplier list,Customer will contact or meeting with them in the early stage,but not means they will cooperate with each of them . (the suppliers ,may some one is mill factory ,distributor ,stockist same as Otai steel ,or trade company) Customer choose or change them according to their business mode /order request / payment terms etc.,As seller ,we focus on set up long-term cooperation with 1-3 customers,but not sell our material to each customer or end user in a oversea market . ( it will take too much time to contact the purchase requirement and follow up feedback of after-sale,we do wholesale ,but not retail )

Knowing a market better can help avoid business risk as possible as we could.

International business will under bigger trade risk under government policy /Credit / exchange rate /price / Shipment etc. ,which compared with the local business activities, Otai do the steel business with steady management over 20 years ,we more seriously for market than other peers .Otai only in charging of reasonable but not huge profit ,and avoiding the risk both customers & Otai as possible as we could .

If we know a oversea market better ,we will know what should we do ,how to do well ,and what we can do better .

special alloy steel

Ms Elwa Lee

Mobile/WhatsApp: 0086-15899675236

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Elwa@otaisteel.com

_{Our H13 STEEL -chapter 3}

The carbon content of the steel determines the matrix hardness of the quenched steel. According to the relationship between the carbon content of the steel and the hardness of the quenched steel, it can be known that the quenching hardness of H13 steel is about 55HRC. For tool steel, part of the carbon in the steel enters the matrix of the steel and causes solid solution strengthening. Another part of the carbon will be combined with the carbide-forming elements in the alloy elements to form alloy carbides. For hot work die steel, in addition to a small amount of residual, this alloy carbide is also required to disperse and precipitate on the quenched martensite matrix during tempering to produce two hardening phenomena. Therefore, the properties of hot work die steel are determined by the uniformly distributed residual alloy carbon compounds and the structure of tempered martensite. It can be seen that the C content in steel cannot be too low.

H13 steel containing 0.5% Cr should have high toughness, so its C content should be maintained at a level that forms a small amount of alloy C compounds. Woodyatt and Krauss pointed out that on the Fe-Cr-C ternary phase diagram at 870 ℃, the position of H13 steel is better at the interface of the austenite A and (A + M3C + M7C3) three-phase region. The corresponding C content is about 0.4%. The figure also shows that increasing the amount of C or Cr makes the amount of M7C3 increase, and A2 and D2 steels with higher wear resistance are compared for comparison. It is also important to keep the relatively low C content so that the Ms point of the steel is taken at a relatively high temperature level (the general information of Ms for H13 steel is introduced at about 340 ° C), so that when the steel is quenched to room temperature An alloy cementite structure mainly composed of martensite plus a small amount of residual A and residual uniform distribution was obtained, and a uniform tempered martensite structure was obtained after tempering. Avoid the transformation of excessive retained austenite at the working temperature to affect the work performance or deformation of the workpiece. These small amounts of retained austenite should be completely transformed during two or three temperings after quenching. By the way, it is pointed out that the martensitic structure obtained after the quenching of H13 steel is lath M + a small amount of flaky M + a small amount of residual A. Domestic scholars have also done some work on the fine alloy carbides precipitated on the slab-like M after tempering.

WhatsApp: +86-769-23190193

Tel: +86-769-23190193

Fax: +86-769-88705839

Email: Jack@otaisteel.com