Category Archives: Blog

4140 pre hard flat bar, Otai provides it all the round year. Anyone is seeking for the 4140, please don’t hesitate to contact us.

This year is a really special year for everyone . as a member of the Otai special steel company, I felt every month of 2020 in haste. in January, we hurry up buying the ticket back to hometown. In February, we are busy preparing the masks. In March, the mask machine is adorable. In April, Spray cloth is a hot sale product. However, what is the theme of May? Because of the policy of the Government, the mold of helmet turns to be a fashion steel product. But Otai provides the 4140 pre hard flat bar all the round year.

As reported, the price of steel is upgrading, the price changes every week. Many steel traders are preparing for the stock of steel. We have a brilliant 4140 pre hard flat bar in our factory. Anyone is seeking for the 4140, please don’t hesitate to contact us. We can export it at a reasonable price.

Most of the flat bar is in the original black surface. It is acceptable for most customers. While some customer needs milled surface, we are equipped with a milling machine. Also, it can be cut to the sizes required. Flat bar thickness is available mostly from 20-100mm.

Typical applications for 4140 steel

Typical applications for 4140 tool steel uses include Components, mold bases, back up and support tooling, fixtures, jigs, mold, Axle Shafts, Bolts, axles, knife, gears, Milling Spindles, machinery parts, and components, etc.

Most of our customers consistently buy 4140 pre hard flat from us. Some of them are stockists, some are end-users, and some are 4140 traders. Because the quality of our 414o plates is good .so the fact proves it. We hope to cooperate deeply with the customers.

Mr Jack Tan

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

Our company could supply the 4140 pre hardened steel plate, but also the steel in other different conditions, like annealed, Milled bright surface. For this steel plates, we keep daily 1000Tons in our stock. So we are the largest stockist in south of China for this 4140 steel plates.

Recently, I got the inquiry from my customer. His company is mainly for the die and tool producing. So he use a lot of tool steel. And our company could provide the one stop solution service. So customer needs us to cut and mill the 4140 pre hardened steel plate into each flat bar for them.

Normally, when we make the cut and mill flat bars, we will proceed it based on the closed thickness steel plates. For example, if you need the milled surface in 13mm thickness, we will make it based on the 16 mm thickness black surface steel plates. We will not cut and mill it based on the very thick blocks. As we all know, when produce the very thick blocks, the price cost will be more higher. And the quality will be not such stable in thick blocks. And moreover, when make it into milled flat bars, the output capacity will be very small if cut based on the block.

For the 4140 pre hardened steel plate, it has high fatigue limit and resistance to multiple impacts. And its low-temperature impact toughness is good.The 4140 in Q+T is widely used to produce various components,such as:bolts. High-strength bolts, wind power bolts, prestressed anchors, post-stressed anchors, steel tie rods, tie rods, tension rods etc. Shafts: shafts, crankshafts, sleeve shafts, linear shafts, pump shafts, rotor shafts, spline shafts, transmission shafts, screw shafts, etc.

OTAI is the stable and reliable supplier for Fortune 500 companies at home and abroad. Such as Thyssenkrupp and China North Industries Group. They placed the repeat order to us very often because of the guaranteed quality.

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

A new customer asked about 42CrMo4 Plate Annealed today,It’s thankful that market seems going tobe recover.

I want 42CrMo4 Plate Annealed in German quality 

But the second email about 42CrMo4 Plate Annealed,it kind of made me upset.As there is not thing question about the steel technology or knowleage.Only said I am worry about the defect of Chinese steel,I want the German quality.

Of course,I have to admit that German steel quality is quite well,and all over people are know it,I guess.

Why he bought a terrible one

I talked more with him,and foud the reason,that he such worry about the quality problem,he bought a terrible batch from China,but the real reason is that he thought that all steel from China should be very cheap.

So he did tried his best to achieved the unreasonable prices,the price of 42CrMo4 Plate Annealed,even lower 20% than us.So I guess what he got just a carbon steel before.

Technical data of 42CrMo4 Plate Annealed

Finally,I told him, no matter you will purchased from China again,Remember 2 thing.

No.1 never think there are something crazy cheap price,espcial much lower than market price.it will make you pay for lesson.

No.2 Check the chemical data about the goods,if you can,to check the company own direct-reading spectrograph,than if would be much safe.

Chemical Composition of 42CrMo4 Steel Material

Ms Sharon Wan

Mobile/WhatsApp: 0086-13580960968

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Sharon@otaisteel.com

To buy 4140 plate, how shall customer choose a  good supplier? which is what every buyer cares about? As a 4140 plate supplier, I would like to share the secret with you.

To buy 4140 plate, how shall customer choose a  good supplier? which is what every buyer cares about? As a 4140 plate supplier, I would like to share the secret with you.

Most of our customers have a lot of experience in buying steel. however, some of them are not knowing how to choose a good 4140 steel and good supplier. I conclude it into three parts.

Firstly, According to the requirements of customers, we provide the corresponding standard of steel and refined materials.

secondly. According to Customers’ expectations on the performance of 4140 steel and special requirements on the performance of the 4140, we recommend appropriate thickness.

Thirdly. Steel supplier shall provide heat treatment service, and recommend appropriate hardness value according to the occasion of 4140 use.

To improve the high-quality steel product, we build the 4140 steel as our brand steel. Otai company is specialized in the 4140 provides. We keep daily storage of more than 500 tons. we are one of the biggest 4140 stockists in the south of China. We are waiting for your cooperation. we can provide a technical suggestions for our customers.

4140 Steel is common chromium-molybdenum steel that usually used after quenched and tempered, with high intensity, high hardenability. 4140 steel plate also has high fatigue strength and good low-temperature impact toughness.

I suppose you choose Otai special steel company as your 4140 plate supplier. the reasons are as follows;

1. 500+ tons daily stock of 42CrMo4 / 4140 steel plate.
2. Hot rolled / annealed / QT condition available.
3. Thickness 20-200mm is available for immediate shipment.
4. Cut to width & cut to length service available.
5. 1~3 days delivery time for a big plate

Mr Jack Tan

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

AISI 4140 Sheet Plate Stocklist from China. AISI 4140 Sheet Plate the best choice to make facemask machine mold. As coronavirus infected all world the world, the best way to protect us was wearing a facemask and leave away from them. And the resource constraints due to daily use and many quantities.

We need more facemask machine. And the machine uses a long time, the mold may have a fault . And now we need more AISI 4140 Sheet Plate to make a new mold. Make sure we could produce more facemask for the common use.

AISI 4140 Sheet Plate Stocklist suit to make mold use on the facemask machine. Otai Special steel from China has more than 16 years of experience in 4140 steel plates, round bar, flat bar, square supply. AISI 4140 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 AISI 4140 alloy steel.

Introduction about AISI 4140 Sheet Plate

AISI 4140 Sheet Plate 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 Hardness is 28-34 HRC.  4140 Annealing delivery hardness less than 250HB.

AISI 4140  Tool steel is an 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 mold, etc

AISI 4140 Sheet Plate Stocklist above 500 tons, and steel round bar and flat sections can be cut to your required sizes.

ASTM 4140 tool steel ground bar can also be supplied, providing high-quality tool steel. precision ground tool steel bar to your required tolerances. SAE 4140 steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes.

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

4140 alloy plate, it is applied in the hammer making.

4140 alloy plate, is it the steel you are looking for? why not try to buy it at Otai company, which is one of the biggest stockists in the south of China. You can find the most suitable thickness as you want. We have abundant specifications and thickness to choose from.

AISI 4140 steel is a low alloy steel containing chromium, molybdenum, and manganese. Due to its excellent toughness, wear resistance, impact resistance, and high fatigue resistance, it is widely used in many industries. It is also widely used in the knife and hammer making.

It is an excellent material, and its versatility and practicality are so great that it is used on many axes.

When discussing 4140 steel, it is important to understand what the Numbers mean.

*4 indicates that 4140 steel is molybdenum steel, indicating that it has a higher molybdenum content than other steel.

*1 means 4140 steel contains chromium.

*40 is used to distinguish 4140 steel from other 41xx series steel.

How is 4140 steel made?

AISI 4140 is made by placing iron, carbon, and other alloying elements in an electric or oxygen furnace. The main alloy elements added in AISI 4140 are cr,  mn, molybdenum. Iron, carbon, and other alloying elements are mixed together in liquid form to cool, and then the steel can be annealed.

When the annealing is complete, the steel is again heated to a molten state so that it can be poured into the desired shape.

At the same time, some tools can be used for hot processing, cold processing to achieve the desired thickness.

Of course, other special operations can be added to reduce mill size and improve mechanical performance

Otai company is specialized in the 4140 alloy plate supply, we export the 4140 alloy steel to the worldwide, such as Europe and South America, Asian and Australia, and so on. Otai expects for your cooperation.

Mr Jack Tan

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

AISI H13 Steel Round Bar size from 40-350MM . Dongguan Otai Special Steel limited are spelized in provide this kind of steel . We have more than 16 years export specil steel working experience to all over the world .

We can supply the round bar, flat bar, plate and square block . Round bar can be sawn to your required lengths as one offs or multiple cut pieces . Steel plate and sheet rectangular pieces can be sawn from flat bar ,sheet or plate to your specific sizes . Ground tool steel bar can be supplied, providing a quality precision finished bar to tight tolerances.

 AISI H13 steel Round bar equivalent with JIS SKD61, GB 4Cr5MoSiV1 and DIN 1.2344 Tool Steel. AISI H13 steel consists of  chromium,   molybdenum and vanadium and is known for its high hardenability and great toughness.

Last week , i have received a inquiry from Singapore . This customer need AISI H13 steel round bar diameter from 40 to 350MM . In China market steel , for this kind of hot die steel . All materials are Annealled . Diameter from 10-50MM should be hot rolled , black surface in normal . Diameter from 55-800MM often was Forged , black surface . And the futher processing should be turned .

So this customer’s inquiry will have two different delivery condition . Dia. 10-50MM will be hot rolled , and Dia. 55-350MM will be forged . Some customer if not end user did not know why the difference . The big round bar use forged production process could ensure the quality . The hardness inner more closed to outer . The chemical composition spread more even . After get the reason , the customer will accpet our suggestion happy .

H-13 Tool Steel is used in hot forging dies, hot forging die inserts, hot gripper dies, hot nut tools, hot header dies, brass forging and pressing dies, hot forging aluminum base dies, aluminum casting and extrusion dies, zinc die casting dies, extrusion mandrels, plastic molds, cores, die holder blocks, hot press dies, hot work punches, etc.

Why do they choose us as the 4140 suppliers? Because we have abundant storage of 4140. 4140 plate thicknesses are between 10mm to 1500mm.

AISI 4140 steel is equivalent to Chinese standard 42crmo. It is widely used in our daily life. Otai steel not only sells the 4140 to the customer abroad, but also to the steel trade in China. Why do they choose us as the 4140 suppliers? Because we have abundant storage of 4140. 4140 plate thicknesses are between 10mm to 1500mm.

Generally speaking, we sold 4140 plate thicknesses with 41/45/46/90mm a lot .many mask manufacturers place orders to our company. they bought the 4140 as the mask mold. They are satisfied with our product. Now the pandemic is much better than the first three months of 2020.many loyal customers also repeat the order of 4140. We keep the daily storage of 4140 more than 500 tons .so we can provide fast delivery. If you have an urgent demand for 4140, welcome to contact us.

We can provide the 4140 Q+T plates,  4140 forged plate, and 4140 heat treatment plate for our customers. Moreover,  the round bar, flat, or coil steel are available .to build the 4140  as Otai company’s brand steel, we have a lot of Preferential policy. we will provide the high quality 4140 with a reasonable price.

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, axles, shafting, piston rods, rams, hydraulic machinery shafts, gears, Conveyor Pins & Rolls, Forks, Gears, Guide Rods, Hydraulic Shafts & Parts, Milling Spindles, Motor Shafts, machinery parts, and components, etc.

Welcome customers to inquiry AISI 4140 steel bar, plate, flat steel for the 4140 steel price. We are a professional supplier and exporter for more than 20 years.

Mr Jack Tan

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

42CrMo4 pre hardened , Otai provide the size your need.

In China,42crmo is commonly used steel. it belongs to middle-carbon alloy steel. However, the 42crmo4 is often exported to abroad. Our foreign customers like the 42CrMo4 pre-hardened. We frequently receive this kind of order.

Recently, a customer from Egypt sends me an email. He wants to buy the 42CrMo4 pre-hardened round bar from our company. the hardness must be 300 HB  / 30 HRC.100 piece round bars dia. 150 mm length 440 mm,  100 piece round bars dia. 150 mm length 370 mm. All pieces saw cut, all pieces UT tested. According to the requirement of our clients, we can reach them.

We are 42crmo and 42crmo4 supplier, we can provide many sizes as you want, and you can’t find the second company like us in the south of China. Otai special steel company is equipped with a new Vertical cut machine. So we can cut the steel as you need. We can also provide the UT record for our customers. I am glad to receive an inquiry about 42crmo4 pre-hardened steel. because it is our super-star product. I replied to the email. I am waiting for the positive reflection of our client.

A lot of new 42crmo4 will arrive at our factory at the end of May. We have the most adequate inventory for 42crmo4 more than 500 Tons. Any shape like sheet plate, round bar, flat bar, square bar, seamless pipe we could provide. Any size from 20-120mm have most stockist, and other 120-250 have better stockist, some very big size 260-500mm also could place an order. The fast delivery for the original plate and bar could within 15 days. if you want to buy 42CrMo4 pre-hardened, please contact me as soon as possible.

Mr Jack Tan

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com