Category Archives: Blog

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

4140 steel plate in OTAI

OTAI boss Jack Tan focus on 4140 as key steel grade since the year 2017, because very reliable supplier with very competitive price. At first OTAI kept 200 tons daily, then 500 tons daily at 2018. At the end of 2019, daily stock increased to 800 tons. Today, the stock usually keep 800 to 1000 tons. That means, all regular size you can buy from us at any time with very quickly shipping time.

4140 steel plate dimension, delivery condition, maching service and lead time

Dimension: Thickness 12mm to 200mm; width: 2000-2300mm; length 3000-5800mm

Delivery condition (as below):

4140 hot rolled plate: Lead time 5-10 days

4140 Q+T (quenched and tempered) plate: 20-30 days

4140 annealed plate: 20-30 days

Machine service: We provide milling and cutting service for steel plate. We can cut to the size per customer’s need, and milling tolerance per customer’s need as well. Production lead time need check separately per different requirements.

4140 steel plate main market

OTAI export 4140 steel plate to all over the world, some are export from trading company in China. OTAI 4140 steel plate customers are from the countries and district as following: Middle East, Southeast Asia, Turkey, Egypt, Australia, Latin America, South Africa, Italy, and Belgium. With effort of OTAI marketing team, we have confidence more and more countries will use our 4140 steel plate.

OTAI 4140 steel plate for sale now, this is really good purchasing time. Send me your size, quantity, specification requirement, price term, we will provide you our most competitive promotional price. Looking forward become your business partner.

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

Many types of steel are used as tool steel, so is the p20 pre-hardened steel. Otai special steel company devotes to provide p20 steel for customers.

Many types of steel are used as tool steel, so is the p20 pre-hardened steel. Have you ever used it? I would like to share something about the p20 tool steel with you. Otai special steel company devotes to provide different tool steel for our customers. p20 steel is a presentation.

Commonly speaking, Otai provides p20 pre-hardened steel, both the round bar and the plate steel are supported. the popular size of the p20 steel we sold is diameter 300mm-500mm. Moreover, it has a Uniform hardness.

Application of p20 pre-hardened steel

P20 steel is Main be applied to in zinc, aluminum, magnesium, and its alloy die-casting mold; Hot-pressing mold, all kinds of a hot forging die; Metal extrusion dies, die set.

We have a customer from Bangladesh send me an email, his company belongs to heavy industry and construction industry.he wants to buy the p20 as mold from our company.the size is 655X625X185MM, 655X125X185MM, 605X600X175MM, 605X110X175MM,he needs to buy two pics each sizes. However, we don’t have a suitable size in storage, and the quantity is little. We communicate with our customers whether the size can be changed or the amount can be added a little more. Our customer denied. So we missed the order.

Generally speaking, we can sell the p20 with MOQ 2 tons if we have storage in the factory, if not, we have a requirement on the quantity.

P20 Mould Steel is 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 are 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. The gold microstructure is martensite and bainite structure.

More details, please contact me as soon as possible.

Mr Jack Tan

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

How to Define a Good 4140 Plate Supplier ? 

First, the supplier should be experienced about the 4140 steel grades as per standard of ASTM A29 standard. The chemical composition and other property should be as per standard. This is the basic.

Second, if the supplier keeps 4140 steel plate stock with complete 4140 plate sizes / thickness or not. For example, 4140 sheet, 1.5mm thickness, 5 tons,  12mm, 6tons, 20mm, 5 tons… Then when anytime, customer need different4140 steel sizes with fast delivery, the supplier could process the order in very short time and delivery. Besides, when customer needs 4140 flat bar with different sizes, the supplier should be equipped with band saw to cut to width according to given spec and quantity. Like Otai, there is around 1000 tons stock of 4140 steel plate for customer’s choose.

Third, if the 4140 plate supplier is also able to supply material with different heat treatment condition and hardness, it would be good. Usually, it is usually supplied as 4140 hot rolled condition. Most of stock materials are hot rolled 4140 plate / flat bar. But some customer also need 4140 annealed plate, or Q+T plate with higher hardness. So, if the supplier could supply all different 4140 plate steel. It would be good for customer.

Fourth, if the price of 4140 plate material would be also good. It would be perfect. Or there would be regular 4140 steel plate for sale, it would be much attractive.

What You Should Care for 4140 Steel Material ?

Because it’s very common for 4140 round bar, but it’s not that popular for 4140 steel plate or 4140 flat bar. So, it’s not that easy to find a reliable 4140 steel plate supplier. But when you find it, you should care about something:

Hardness: Hardness of different condition of 4140 plate. Generally, the 4140 annealed plate hardness is max 255HB, while the quenched and tempered (Q&T) plate 28-32HRC (280-320HB). So, when you have requirement of hardness, you should make it clear to supplier, to avoid the wrong material condition.

Properties: When you have special mechanical properties, you would need heat treated plate for sure.

Equivalent: There are 4140 steel plate equivalent steel grades, that is, 42CrMo4 / 1.7225 plate or SCM440 plate. You would need to specify 4140 grade if you don’t accept equivalent. You could see the difference in this post 4140 | 42CrMo4 | SCM440.

Otai is the reliable supplier, also 4140 plate supplier for Uddeholm. Reliable supplier with complete range of sizes and ability for heat treatment and cutting to size. Welcome for steel 4140 plate request anytime.

Mr. Jeremy H.

Mobile/WhatsApp: 0086-13610149979

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jeremy@otaisteel.com

There are many 4140 steel plate suppliers in China. However, Otai has 21 years’ experience in the steel business, we got a very good reputation from our customers

4140 steel plate supplier

There are many 4140 plate suppliers in China. However, Otai has 21years’ experience in the steel business, no matter in domestic or overseas, we got a very good reputation from our customers. Our warehouse always keeps the daily stock for the 4140 steel plates in 1000Tons each day, so we are the largest stockist in the south of China. many customers make repeat orders to buy 4140 steel and other steel grades from us very often. Some new customers may have some concerns about the quality when they placed the first buying. So it really is very important to find a reliable 4140 steel plate supplier.

This week, one of our customers from German wants to buy the Steel bar 42CrMo4 Size ∅6, ∅5, ∅ 8 h8 from our company. Our customer is selling and repairing APUs and components .he wants to buy our 4140 as the Components. However, the sizes he needs is too small, we can’t provide it for him. So he sends me another email about the other type of steel. We communicate with each other, I hope I will hear good news from him.

Recently, Otai also has 4140 coil steel in storage, the thickness is between 3mm to 10mm. We also provide the 4140 round steel and 4140 plate steel for our customers.4140 will be our super-star product in 2020, the quality of it is assured, we keep good post-service for our customers. We sold our 4140 products to many foreign countries such as Brazil, Italy, Australia, and so on. No matter our end-users or Stockists keep a good relationship with us. Normally speaking, they repeat the order every several months.

If you are finding the 4140 steel plate supplier, and have no idea to choose the reliable one, I suggest you choose us.

Mr Jack Tan

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

42crmo4 plate steel-children’s mask mold material, Otai has already prepared.

42crmo4 plate steel-children’s mask mold material, Otai has already prepared.

There is good news today, students are ready for going back to school. Because of the pandemic, everyone’s life turns to a mess, our daily life is totally damaged .students have to study online, we have to work at home. However, the government release the good news for us .students will gradually resume going back to school. Maybe China is the first country to take this kind of measure.

I am sorry to know that the pandemic is still serious. I hope the pandemic will pass soon, everyone’s life turns to normal. Although the risk exists, if we prepared well, it will be safe. One of the reminders is children have to wear the mask every day.

When students go back school, they have to wear the mask, and change one every four hours .to satisfy to demand of children mask, We provide different size of mask mold. 42crmo4 plate steel is a suitable material for making the mask mold.

In the past 3 months of 2020, we sold a lot of 42crmo4 steel. During that period, the majority of our customers are mask manufacturers. We have rich experience in mask mold making. In the past 3 months, our colleagues work day and night to produce the mask mold.

AISI 4140  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.

4140 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.

Because of the properties of 4140, it is suitable for making the mask mold. Anything any details , you are welcome to contact me.

Mr Jack Tan

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com