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Cr12MoV Sheet Plate similar to ASTM D2 tool steel and W-Nr. 1.2379 and JIS SKD11 . Why this materials have so much different steel grade number ? And how about the difference between them ? When should these different materials be used? What kind of product is best for what kind of material? Just pay attention to Otai Special Steel , we will give you the best answer .

Cr12MoV Sheet Plate similar to ASTM D2 tool steel and W-Nr. 1.2379 and JIS SKD11 . Cr12MoV was Chinese standards GB/T 1299-2000 , this materials was Cold work die steel, steel hardenability, quenching and tempering hardness, wear resistance, strength are higher than Cr12. Used for manufacturing various cold-punching dies and tools with large cross-sections, complex shapes and heavy working conditions, such as punching dies, trimming dies, hemming dies, steel sheet deep drawing dies, circular saws, standard tools and gauges, Thread rolling die, etc.

Cr12MoV Sheet Plate similar to ASTM D2 tool steel and W-Nr. 1.2379 and JIS SKD11 . ASTM D2 was American standard , D2 steel has high wear resistance, micro-deformation cold work die steel, hard tool steel, carbon content up to 1.5%, chromium content up to 11.5%, and heat treatment hardness up to 60HRC. D2 steel, such as silicon steel sheet dies, cold-cutting scissors, trimming dies, etc.

Cr12MoV Sheet Plate similar to ASTM D2 tool steel and W-Nr. 1.2379 and JIS SKD11 . SKD11 was Japanese standard , The steel has high hardenability, and the cross section of 300 ～ 400 ° ㎜ can be fully hardened. At 300 ～ 400 ° C, it can still maintain good hardness and wear resistance. The toughness is higher than that of Cr12 steel, and the volume change during quenching is minimal. It can be used to make a variety of molds and tools with large cross-sections, complex shapes and withstanding large impact loads. For example, punches with complex shapes, inserts on complex dies, deep drawing die for steel plates, drawing dies, threaded die plates, cold extrusion dies, cold cutting scissors, circular saws, standard tools, measuring tools, etc.

Ms Monica Yu

Mobile/WhatsApp: 0086-13711903397

Tel: 0086-769-23190193

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Email: Monica@otaisteel.com

Sold 4140 Alloy Steel in Otai Special Steel in China . Time flies , when i have joined this company i am slim young girl , and now i am the monther of two baby girls . Everyone is getting old , but Alloy steel never changes . Otai Special Steel always here for you to provide any size for AISI 4140 sheet plate and round bar and square bar and flat bar and so on , we have adequate inventory to meet all customer needs . Welcome to contact with us immediently .

Sold 4140 Alloy Steel in Otai Special Steel in China . AISI 4140 Tool steel is a alloy structural steel, 4140 is used for engineering structural, like high tensile shafts, bolts and nuts, gears, pinions and spindles. Locomotive traction with the big gear, supercharger drive gear, pressure vessel, rear axle, gear load of connecting rod and a spring clip,4140 can also be used to under 2000 m deep well of oil drill pipe joint and the fishing tool, and can be used for bending machine mould, etc. Thanks for all the customer from all over the world still stand by Otai Special Steel to support with us . Never change like the steel .

Sold 4140 Alloy Steel in Otai Special Steel in China .  ASTM alloy 4140 steel bar, flat or plate material can be used for as wide variety of applications where greater toughness and wear resistance is needed over lower carbon grades. Typical applications for 4140 tool steel uses include Components, Adapters, Arbors,strippers, holder blocks, mold bases, ejectors, back up and support tooling, fixtures, jigs, molds, cams, drill collars, Axle Shafts, Bolts, Crankshafts,stubs, couplings, reamer bodies, axles, shafting, piston rods, rams, hydraulic machinery shafts, gears, sprockets, gear racks, chain links, spindles, tool bodies, tool holders, tie rods, Connection Rods, Chuck Bodies, Collets, Conveyor Pins & Rolls, Ejector Pins, Forks, Gears, Guide Rods, Hydraulic Shafts & Parts,Lathe Spindles, Logging Parts, Milling Spindles, Motor Shafts, Nuts, Pinch Bars, Pinions, Pump Shafts,boring bars,tracks, slides, wear strips or parts, forming dies, brake dies, trim dies, bolsters, machinery parts and components, etc.

Sold 4140 Alloy Steel in Otai Special Steel in China . Welcome customers to inquiry AISI 4140 steel bar, plate, flat steel for the 4140 steel price. We are professional supplier and exporter for more than 20 years. We offer you worldwide solution for aisi alloy 4140 steel bar.

Ms Monica Yu

Mobile/WhatsApp: 0086-13711903397

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Monica@otaisteel.com

_{Our H13 STEEL -chapter 4}

_{Our H13 STEEL -chapter 4}

As we all know, increasing the carbon content in steel will increase the strength of the steel. For hot work die steel, it will increase the high temperature strength, hot hardness and wear resistance, but it will lead to a reduction in its toughness. Scholars in the tool steel product manual literature compared the performance of various types of H-shaped steel clearly proved this view. It is generally believed that the carbon content limit that leads to a decrease in the plasticity and toughness of steel is 0.4%. For this reason, people are required to follow the following principles in the design of steel alloying: to keep the carbon content of the steel as low as possible while maintaining the strength. Some data have been proposed: when the tensile strength of the steel is above 1550 MPa, the C content is 0.3. % -0.4% is appropriate. The strength Rm of H13 steel is described in the literature as 1503.1 MPa (at 46 HRC) and 1937.5 MPa (at 51 HRC).

The C content in TQ-1, Dievar, ADC3 and other steels recommended by consulting FORD and GM company data are 0.39% and 0.38%. The corresponding toughness indicators are listed in Table 1. The reasons can be seen from this observation.

For hot work die steels that require higher strength, the method used is to increase the Mo content or increase the carbon content based on the composition of H13 steel, which will be discussed later. Of course, a slight reduction in toughness and plasticity is possible. Expected.

2.2 Chromium: Chromium is the most common and inexpensive alloying element in alloy tool steel. The Cr content in the H-type hot work die steel in the United States ranges from 2% to 12%. Among the 37 grades of alloy tool steel (GB / T1299) in China, Cr is included in all steels except 8CrSi and 9Mn2V. Chromium has a beneficial effect on the wear resistance, high temperature strength, hot hardness, toughness and hardenability of steel. At the same time, it will significantly improve the corrosion resistance of steel when dissolved in the matrix. Cr and H13 in H13 steel Si makes the oxide film dense to improve the oxidation resistance of the steel. Furthermore, the effect of Cr on the tempering performance of 0.3C-1Mn steel is analyzed. The addition of ﹤ 6% Cr is beneficial to improve the tempering resistance of the steel, but it does not constitute secondary hardening. When the steel containing Cr ﹥ 6% is quenched, After tempering at 550 ° C, a secondary hardening effect will occur. People generally choose 5% chromium for hot work steel die steel.

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_{Our H13 STEEL -chapter 5}

Our H13 steel -CHAPTER 5

Part of the chromium in the tool steel is dissolved in the steel to strengthen the solution, and the other part is combined with carbon, and exists in the form of (FeCr) 3C, (FeCr) 7C3 and M23C6 according to the chromium content, thereby affecting the performance of the steel. In addition, the interaction effects of alloy elements must be considered. For example, when chromium, molybdenum, and vanadium are contained in the steel, Cr> 3% <sup> [14] </ sup>, Cr can prevent the formation of V4C3 and postpone Mo2C. Lattice precipitation indicates that V4C3 and Mo2C are strengthening phases <sup> [14] </ sup> that improve the high temperature strength and tempering resistance of steel, and this interaction improves the heat deformation resistance of the steel.

Chromium is dissolved in the austenite of the steel to increase the hardenability of the steel. Cr, Mn, Mo, Si, and Ni are alloy elements that increase the hardenability of steel, just like Cr. People are accustomed to use the hardenability factor for characterization. Generally, the existing domestic data [15] only use data from Grossmann et al. Later, the further work of Moser and Legat [16, 22] proposed that the C content and austenite grains The degree determines the basic hardenability diameter Dic and the hardenability factor (shown in Figure 3) determined by the alloy element content to calculate the ideal critical diameter Di of the alloy steel, which can also be approximated from the following formula:

Di=Dic×2.21Mn×1.40Si×2.13Cr×3.275Mo×1.47Ni (1)

_{(1) Each alloy element in the formula is expressed by mass percentage. From this formula, people have a fairly clear semi-quantitative understanding of the effects of Cr, Mn, Mo, Si and Ni on the hardenability of steel.}

_{The effect of Cr on the eutectoid point of steel is roughly similar to that of Mn. When the chromium content is about 5%, the C content of the eutectoid point decreases to about 0.5%. In addition, the addition of Si, W, Mo, V, Ti significantly reduces the C content at the eutectoid point. For this reason, it can be known that hot work die steel belongs to hypereutectoid steel like high speed steel. Decreasing the eutectoid C content will increase the alloy carbide content in the austenitized structure and in the final structure.}

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38CrMoAl is a nitrided Alloy Steel with high wear resistance, high fatigue strength and high strength.

It is mainly used for nitrided parts with precise dimensions after heat treatment, or various nitrided parts with low impact load and high wear resistance. Such as boring bar, grinding machine spindle, automatic lathe spindle, worm, precision screw, precision gear. And also such as High-pressure valves, valve stems, gauges, templates, rollers, replicas, cylinder blocks, compressor piston rods, governors on steam turbines, rotating sleeves, fixing sleeves, various wear-resistant parts on rubber and plastic extruders, etc.

We dealed with a 38CrMoAl Alloy Steel  project before with a middle east customer .

Order confirm of 38CrMoAl Alloy Steel round bar

Customer need 26 tons 1.8509 alloy steel, Otai Steel engineer suggest 38CrMoAl to them .There is rare 1.8509 stock material in China ,all of Chinese steel mill production 38CrMoAl instead of 1.8509.

Customer try to order 1.8550 /1.8507 /1.8519 instead of 1.8509 alloy steel round bar .and our engineer update the folow chemical composition as below to customer for reference . and customer Choose 38CrMoAl finally .

The order delivery condition as follow :

–1.Hot Rolled；;Black Surface

–2.Hardness：160~260HB

–3.Length：4000~6000mm

–4.UT-SEP 1921C/C or Better

–5.Chmical Analyzed 38CrMoAl ( or 1.8509 )

–6.Fix Diameter ( Accept the tolerance -/+1.5mm)

–7.SGS or other third party inspection under buyer‘s arrangement

Order inspector of 38CrMoAl Alloy Steel Round bar .

After our QC feedback for the test process of inspector,the inspector did not do the steel test before ,and there without some mistake of the test way .

1.First ,the goods is Hot Rolled,Black Surface ,and there is reasonable with rusted ,Black sueface means the item is Ex-mill condition cover with Oxide Layer.

Alloy Steel Black surface + Bright Surface

2.About the unit weight  and Label “38CrMoALA”, each of the sizes produced in a factory and aligned with the printed label.

3.About the Diameter ,The inspector did not use the Vernier Caliper to check it. AGS is the first one who use the length ruler to check it.

After the long meeting with customer , they agree our test report instead of AGS .and finished 38CrMoAl Alloy Steel round bar shipment and payment process as usually .

Ms Elwa Lee

Mobile/WhatsApp: 0086-15899675236

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4130 Steel , another known name is Chromoly Steel or AISI 4130, it is a chromium and molybdenum alloy steel. 4130 steel is known for its responsiveness to mechanical and heat treatments.

Do you know about 4130 steel tube? It is commonly used in structural steel.  4130 Steel , another known name is Chromoly Steel or AISI 4130, it is a chromium and molybdenum alloy steel. 4130 steel is known for its responsiveness to mechanical and heat treatments. Let me share the details of 4130 with you.

Characteristic of 4130 steel tube

4130 steel tube is weldable by most commercially popular methods. Cold working is possible and forming often takes place in the annealed condition. It is important to note that the machining of Alloy Steel 4130 is difficult when the hardness of the alloy increases. 4130 steel is popular in many critical industries such as aerospace, automotive, and oil and gas.we can provide 4130 Steel Tube: outer diameter 4mm to 800mm.Surface Finish: Black, Rough Machined, Peeled, Turned or as per given requirements.

Application of 4130 steel include:

• Valve bodies
• Pumps
• Fittings
• Engine mounts
• Welded tubing.
• Oil and gas sector, like collets, connection rods, conveyor pins, stem assemblies, gears, Bearings.

One of our customers comes from Malaysia bought the 4130 from our company, the company is a precision machining service provider catering for the oil and gas sector, he was satisfied with the 4130 steel tube.

Chemicals composition of 4130 include:

• Cr 0.80-1.10%
• Mn 0.40-0.60%
• C 0.28-0.33%
• Si 0.15%-0.30%
• Mo 0.15-0.25%
• S 0.040%
• P 0.035%

Otai Steel offers  4130 steel tube in a variety of sizes and shapes that include rounds, bars, and plates. all of our Steel Alloy 4130 meets or exceeds leading industry standards like ASTM, AMS, DIN, and more. To learn more about our selection of Alloy Steel 4130 or any of our other products and services, please feel free to connect with me.

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.

Mr Jack Tan

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

What is the mild steel material? First, let’s learn that what the carbon steel is. According to the definition of SAE / AISI, Carbon steel refers to the following.

If you would like to know the mild steel material, may we need to understand the carbon steel. Generally, carbon steel can be divided into 4 categories.
Low carbon steel (carbon content is not more than 0.30%).
Middle carbon steel (carbon content is 0.30% ~ 0.60%).
High carbon steel (carbon content is 0.60% ~ 1.00%).
Free-cutting steel.
The properties and processing characteristics of carbon steel mainly depend on the content of carbon and manganese, and the purity of the steel.

And what is the classification of mild steel material?
Low carbon steel can be divided into two groups based on the carbon content.
The first group refers to low carbon steel with a carbon content of less than 0.15%.The second group refers to low carbon steel with a carbon content of 0.15% to 0.30%.Mild Steel belongs to a category in the second group. That is a category with a carbon content of 0.15% to 0.30% and an Mn content of not more than 0.75%.

It should be noted that mild steel is a special one in the second group of low carbon steel. Mild steel material generally has good weldability. But due to a certain hardening tendency, pre-weld preheating may be required when the manganese content is high. The cross section is thick, or the joints are highly restrained. When the thickness of the welded joint is greater than 25mm. Especially when the carbon content of the substrate exceeds 0.22%. The mild steel needs to be preheated to about 40 ° C. And after the welding is completed, the stress release heat treatment temperature of the weld zone is about 525 ° C ~ 675 ° C.

We are the professional stockist of  on the tooling steel, high speed steel and mild steel material for more than 20 years. We have our own warehouse. Our machines are including CNC flame cutting,horizontal and Vertical saw  machine, Grinding and Milling machine.For making sure and testing the quality.We have Chemical Spectrometer, Ultrasonic Tester and hardness tester. We aim that quality is the first, cooperation is the second, we OTAI will be always with you for growing up.

Ms Phoenix Li

Mobile/WhatsApp: 0086-13925830813

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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

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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

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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