Category Archives: Blog

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

OTAI Special steel not only supply the steel plates, blocks, flat and round bar, hexagon, but also the steel sheet, like 4140 steel sheet.

And usually, the 4140 steel sheet thickness we offered is ranged in 3-10mm.And the width size in 1260-1500mm, and the length in coil. And for each coil, the weight is about 20Tons.For our customers, it contains different types, like the stockist, end user and trading company.When we receive the inquiry from our customers, we will find that some customers missed some important info very often.

Here we would like to summarize what are the points very related with the price closely.

1)Size info: Normally, if the length in random length, the price will be lower a lot than the fixed length. Few days ago, I met one customer only show the total length they requested. So fixed length or random length, it is better to make it clear.

2)Quantity, you could advise it in piece or the weight for each item. Some customer will only show the number, but no one can sure that whether it is in piece or Ton.

3)Delivery condition: For this one, it is very important, some friends always will forget to mention it on the inquiry. Normally, for the surface, we will have black surface, bright surface(milling, debarked, turning), cold drawn. And there are 4 different heat treatment ways, so if you have any special request on the heat treatment, do not forget to mention. It is including Annealing, normalizing, Quenching+Tempering(these two will be needed together)

4)If you have any special spec request on the chemical element, hardness request and the mechanical property, it is better to provide the details.So when your customers send you the inquiry, you could have the overview and check whether they provide you the full info or not.

We are the largest stockist in south of China, and we provide the one-stop solution service. As we have our own warehouse and machine equipments.Our quality also got the accredited from Thyssenkrupp and the SGS and ISO certificate. So you are really lucky to find us here as the very reliable supplier on the 4140 steel sheet and other steel materials.

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

1.2311 Forged plate with big thickness from 400-600MM . Normally , 1.2311 hot rolled original board the size should be 10-160MM thickness . For hot rolled production process , the width shoud be 2000-2300MM . The delivery conditions should be Pre-hardening .

In Chinese steel market , the most adequate inventory was hot rolled sheet plate , and some big thickness was forged . Otai Special Steel have the most complete and sufficient inventory of 1.2311 sheet plate . We have more than 500Tons in warehouse . Most of them are 1.2311 Forged plate with big thickness .

Last week , i received a new inquiry about 1.2311 plate from Turkey . The customer only tell us he needed thickness from 400-600MM and width 1000-1500MM , length 2000-6000MM . No production process request . No delivery conditions requirement . After check with our stocklist , we found that we need to place order for this so big thickness . And this must be forged . No hot rolled plate could arrived this thickness , and the quality are hard to control for hot rolled . So we suggest the customer to take the forged plate , and Q+T make the quality better for processing .

1.2311 Tool steel 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.

1.2311 Forged plate often use for some big thickness or some products with higher processing requirements . Forged production internal composition is even . Hardness inner are more closed to the outer . After we explained all the production processing details to the client , the client thanks for us to know their requirement clearly . And this may help them more convenient for end use . No matter when they may place the order to us , but the know how to use this materials in the best way . That is why Otai Special Steel could stand in here to export the special steel to aboard for more than 16 years .

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

42crmo4  pre-hard round bar, Otai is a reliable supplier.

Otai special steel company sells alloy steel, tool steel, carbon steel. We export special steel worldwide. Our main product is 42crmo4 steel. 42crmo4  pre-hard round bar is also included. We are finding serious steel importers and distributors. I hope we can cooperate with each other, and benefit each other.

We have sincerely customers abroad. We strive to improve the service and provide a high-quality product. Today I would like to share a story about after-sell service, with you.

We have a customer in Egypt, he bought the 42crmo4 pre- hard round bar from our company. his company serves for the local government. It is used as a basic gyp construction. Our customer bought Two cabinets 42crmo4 from our company. after he purchased the order, we Booked the Ship Cabinet. However, when our customer received the product, he was unhappy, because it is hard to pull out the steel. We didn’t add the wood in the cabinet, so the cabinet is damaged by the steel. as our clients didn’t tell us special requirements about loading, we ship it as normal. I apologized to our customer. I negotiate with him and promise we will add two pieces of wood in the cabinet from next time. he is glad to hear that. Otai company is responsible for ever order.

42crmo4 steel series we can provide:

42crmo4 pre-hard round bar 12-120mm; can open as your specifications;

42CrMo4 hot-rolled plate 12-185mm can be cut into your specifications, smooth plate finishing.

42CrMo4 / 4140 forging bar 300-500.We guarantee the uniform in hardness.

Otai promises to be responsible for every single shipment to the end, without tangling responsibilities and solving customer problems as soon as possible.

Mr Jack Tan

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

Today i want to told you a story about 4140 Round Bar Cold Drawn Q+T . First all , please let me introduce myself . This is Monica Yu from Dongguan Otai Special Steel from China .  And we have specialized in export special steel to all over the world . We have more than 15 years work experience in this industry .  We have the most adequate inventory for 4140 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 stocklist , and other 120-250 have better stocklist , some very big size 260-500mm also could place order . The fast delivery for original plate and bar could within 15 days .

I have received a new inquiry about 4140 Round Bar Cold Drawn Q+T . This new inquiry come from Malaysia . In this week after come back from May Day holiday . Most country have resume to work after Coronavirus . In this inquiry , the customer request for 4140 round bar bright surface and size diameter 14 / 16 mm  , Q+T .

The most normal situation for 4140 round bar was hot rolled , black surface from Dia. 16-120mm . The size below 16mm should be 4140 round bar cold drawn Q+T production process . Diameter could to be choose like : 16 , 14 , 12 , 10 , 8 , 6MM . The customer did not accept the black surface situation , so we suggest them to take the cold drawn production . And i send the before loading cold drawn production picture to the customer  to confirm the correct situation . After all , the customer confirm the items was really what he wanted . And we all solved our problems .

After confirmed the correct situation for production , we could discuss with each other about the best price . Only know clearly about customer’s requirement . We could give the best lowest price and promotion of the order transactions . And in the three days , the customer send us purchase order with 4140 round bar cold drawn Q+T one 1*20’GP container . And we will loading the container to them with in 15 days for all clearly . If we want to confirm details after we get the purchase order . We may lost many time on this , and could not make fast delivery .

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com