Category Archives: Blog

42CrMo4 Steel Pipe Stocklist For Sales Promotion from China after coronavirus . In March , we have received many demands for 42CrMo4 Steel Pipe . Luckly we have many stocklist for this production . And all the measure are according to Chinese regular production size . One out diameter have many different wall thickness to choose .

42CrMo4 Steel Pipe Stocklist For Sales Promotion from China after coronavirus  from OTAI Special Steel . In March , We have received new inquiry from Turkey , Argentina …… for 42CrMo4 Steel Pipe .  And recently we have planned to provide sales promotion for this materials . Because for we have many stock in various out diameter and wall thickness to meeting all your request . Please contact with us urgently . The Inventory is reduced daily . The stock may sold out for some special size .

42CrMo4 Steel Pipe Stocklist Mechanical Tubing are medium carbon alloy grades . Which are widely used for many general-purpose applications that require high tensile strength and toughness . Alloy tubing is an excellent candidate for most processing techniques . Where strength is required and allows for many options due to its available sizes produced .

42CrMo4 Steel Pipe Stocklist alloy tubing is easiest of the common alloy grades to be machined . With a minimal stock allowance for clean-up . It has excellent machining characteristics and is a medium carbon alloy.

42CrMo4 Steel Pipe Stocklist is usually supplied ready heat treated to hardness in 18-22 HRC .  If further heat treatment is required, then heat to 840 oC – 875 oC, hold until temperature is uniform throughout the section . Soak for 10 – 15 minutes per 25 mm section, and quench in oil, water, or polymer as required .

Welcome to inquiry with us 42CrMo4 steel pipe , and we also have other steel pipe AISI 1020 and 1045 . Some less quantities with 4130 tubes , please send request for get the quotation .

jack@otaisteel.com

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

Today let’s talk about the H13 Steel,

H13 is a hot-working die steel. It is a steel type formed by adding alloying elements on the basis of carbon steel. The standard GB / T1299-2000 is implemented.

Let’s talk about H13 Steel  Today.

H13 is a hot-working die steel. It is a steel type formed by adding alloying elements on the basis of carbon steel. The standard GB / T1299-2000 is implemented.

1.Corresponding grade of H13: 4Cr5MoSiV1

H13 Steel mechanical properties: hardness: annealing, 245 ～ 205HB, quenching, ≥50HRC

H13 Steel is the most widely used and representative hot work die steel.Its main characteristics are

(1) It has high hardenability and high toughness;

(2) Excellent resistance to thermal cracking, which can be water cooled in the workplace;

(3) With medium wear resistance, carburizing or nitriding processes can also be used to increase its surface hardness, but the heat crack resistance should be slightly reduced;

(4) Due to its low carbon content, the secondary hardening ability is poor in tempering;

(5) It has anti-softening ability at higher temperatures, but the hardness decreases rapidly when the use temperature is higher than 540 (1000) (that is, the working temperature can be 540);

(6) Small deformation during heat treatment;

(7) Medium and high machinability;

(8) Medium resistance to decarburization.

What is even more remarkable is that H13 Steel can also be used to make important components in the aviation industry.

1. AISI H13 tool steel Chemical composition

AISI H13 Steel Forging

For forging H13 tool steel, first slowly Preheat to 750°C(1382°F), soak enough time, then rapidly heat to 1050-1100 °C(1922-2030°F). then start forging, ensure the forging temperature higher than 850°C(1562°F).  Cool H13 tool steel must be slowly after H13 steel forging finished.

Ms Sharon Wan

Mobile/WhatsApp: 0086-13580960968

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Sharon@otaisteel.com

Most of my customer asking the formula for calculating weight of steel plate，When they were going to purchasing 4140 plate.

Most of my customer asking the formula for calculating weight of steel plate，When they were going to purchasing 4140 plate.for steel stockist,most of them did the procurement base on ton,but for some trading company and some factory,which is the end users,they would like to buy base on pieces unit.however,as a steel wholesaler,most of the order are charged by tons,that some company they wanna calculate advance by themselves，to estimate the cost .

So now,I try to collect most of the steel formula here.

Formula for calculating weight of steel plate

Formula: 7.85 × length (m) × width (m) × thickness (mm)

Example: steel plate 6m (length) × 1.51m (width) × 9.75mm (thickness)

Calculation: 7.85 × 6 × 1.51 × 9.75 = 693.43kg

Steel tube weight calculation formula

Formula: (outer diameter-wall thickness) × wall thickness mm × 0.02466 × length m

Example: 114mm (outer diameter) x 4mm (wall thickness) x 6m (length) of steel pipe

Calculation: (114-4) × 4 × 0.02466 × 6 = 65.102kg

Round steel weight calculation formula

Formula: diameter mm × diameter mm × 0.00617 × length m

Example: Round steel Φ20mm (diameter) × 6m (length)

Calculation: 20 × 20 × 0.00617 × 6 = 14.808kg

Square steel weight calculation formula

Formula: side width (mm) x side width (mm) x length (m) x 0.00785

Example: Square steel 50mm (side width) x 6m (length)

Calculation: 50 × 50 × 6 × 0.00785 = 117.75 (kg)

Flat steel weight calculation formula

Formula: side width (mm) x thickness (mm) x length (m) x 0.00785

Example: Flat steel 50mm (edge width) x 5.0mm (thickness) x 6m (length)

Calculation: 50 × 5 × 6 × 0.00785 = 11.7.75 (kg)

Hexagonal steel weight calculation formula

Formula: Opposite diameter × Opposite diameter × Length (m) × 0.00068

Example: Hexagonal steel 50mm (diameter) x 6m (length)

Calculation: 50 × 50 × 6 × 0.0068 = 102 (kg)

Rebar weight calculation formula

Formula: Diameter mm × diameter mm × 0.00617 × length m

Example: Rebar Φ20mm (diameter) × 12m (length)

Calculation: 20 × 20 × 0.00617 × 12 = 29.616kg

Ms Sharon Wan

Mobile/WhatsApp: 0086-13580960968

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Sharon@otaisteel.com

The theoretical weight of 4140 steel is the weight calculated from the nominal size and density of the steel (formerly known as specific gravity).

The theoretical weight of 4140 steel is the weight calculated from the nominal size and density of the steel (formerly known as specific gravity). This is called the theoretical weight. This is directly related to the length, cross-sectional area, and tolerance of the steel. Due to the allowable deviation of the steel in the manufacturing process, the theoretical weight and actual weight calculated by the formula are somewhat different, so it is only used as a reference when estimating.

Actual weight of 4140 steel

The actual weight of steel refers to the weight obtained by the actual weighing (weighing) of the steel, which is called the actual weight. Actual weight is more accurate than theoretical weight.

Calculation method of steel weight

(1) Gross weight is the symmetry of “net weight”, which is the total weight of the steel itself and the packaging material. The transportation company calculates the freight based on gross weight. However, the purchase and sale of steel is calculated based on the net weight.

(2) Net weight is the symmetry of “gross weight”. The gross weight of the steel minus the weight of the packaging material, that is, the actual weight, is called the net weight. In steel purchase and sale, it is generally calculated by net weight.

(3)Tare The weight of 4140 steel packaging materials is called tare.

(4) Weight ton The unit of weight used when calculating freight based on the gross weight of steel. Its legal unit of measurement is ton (1000kg), as well as long ton (1016.16kg in English weight units) and short ton (907.18kg in American weight units).

(5) Billing weight Also known as “billing ton” or “freight ton”. The weight of the steel charged by the transportation department. Different shipping methods have different calculation standards and methods. For railway vehicle transportation, the marked weight of the truck used is generally used as the billing weight. Road transport charges freight based on the tonnage of the vehicle. Less-than-truckload for railways and highways is based on a gross weight of a few kilograms, which is charged at a minimum.

Ms Sharon Wan

Mobile/WhatsApp: 0086-13580960968

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Sharon@otaisteel.com

How to make sure DC53 no quality complaint for 5 years?

How to make sure DC53 no quality complaint for 5 years?Never purchase the DC53 cheaper than the market price!

A customer from south America-Mr David,he told me that our company’s DC53 is really goods,he sure will reorder in a large quantity next time,Mr David specialized in  Furniture hardware fittings extrusion,his factory’s mould was made by DC53,but it’s purchase at his local market with a cheap price,and it always face the problem of mould bursting.last December,he purchased a batch of DC53 from us,the condition of DC53 is pre-hardening,this year,we did the after sales service,Mr David said :your DC53 really good,the mould bursting less than before,sure will make a larger order next time.Customer’s affirmation is the best way to plus our reputation,and we also happy to tell him that our company’s DC53 no quality complaint for 5 years,and sure he will satisfy with next batch of goods.

If you want to know more about DC53,please check data as below,or contact me when you feel free.

JIS DC53 tool steel china supplier and stockholders, Otai special Steel are Special steel china suppliers of DC53 steel in round bar, flat bar, sheet , plate and steel block. we can saw cutting DC53 as your requirements size. DC53 is improved new type of cold work die steel from SKD11 . The technical specification in Japanese industrial standard JIS G4404.

Cold work DC53 tool steel overcomes the insufficient of SKD11 high temperature tempering hardness and toughness of weakness, DC53 tool steel will fully replace SKD11 tool steel in the field of general and precision mould . Its toughness is 2 times of SKD11,  DC53 toughness is more prominent in the cold work die. Made of DC53 tools steel rarely appear crack and craze, greatly improving the service life.
The DC53 tool steel has a uniform distribution of fine carbides. It has great galling and wear and fatigue resistance. It has also a High temper resistance to support PVD & nitride surface treatments. And it has Machining and grinding properties are superior to most other tool steels.

Ms Sharon Wan

Mobile/WhatsApp: 0086-13580960968

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Sharon@otaisteel.com

Since the 42Crmo4 for mask machine situation in domestic market,we have contacted some customers who purchase 42Crmo4 often

Since the 42Crmo4 for mask machine situation in domestic market

We have contacted some customers who purchase 42Crmo4 often ,they feel thankful for this news,as the market is slow down by the virus,and now they know some factory are need 42Crmo4 urgently,are going to sale a lot of 42Crmo4.

Now,the virus spread all over the world.A lot of business are slow down,but except the medical supplies,it need a big replenishment,many country are lack of mask heavily,and mask is the base way to protect people clean and keep the virus away,now,many factory are waiting for the mask machine to produce mask,the world is waiting for it.

If you want to know more about the 42Crmo4 for mask machine,please contact me.

 Applications

DIN 42CrMo4 Tool steel is a alloy structural steel,42CrMo4 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.

Heat treatment

• Annealing
  42CrMo4 alloy steel is annealed at 872°C (1600°F) followed by slowly cooling in the furnace.
• Tempering
  42CrMo4 alloy steel can be tempered at 205 to 649°C (400 to 1200°F) depending upon the desired hardness level. The hardness of the steel can be increased if it has lower tempering temperature. For example, tensile strength of 225 ksi cab be achieved by tempering at 316°C (600°F), and a tensile strength of 130 ksi can be achieved by tempering at 538°C (1000°F).
• Hardening
  42CrMo4 alloy steel can be hardened by cold working, or heating and quenching.

       Processing

42CrMo4 steel round bar and flat sections can be cut to your required sizes. ASTM 4140 tool steel ground bar can also be supplied, providing a 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.

Ms Sharon Wan

Mobile/WhatsApp: 0086-13580960968

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Sharon@otaisteel.com

The 42CD4 Plate hot treatment, an important part of the mask factory. otai suppies the parts for the mask factory all over the world.

When I wake up every day,the first thing is to check the statistic about the coronavirus. whether it turns to be better now? life is precious for everyone. As reported, I notice that the epidemic could infect two-thirds of the globe. it has highly contagious, we can’t underestimate it.

The government in china encourage us to wear the mask in public and washes our hands frequently. The demand for a mask is over the supply, so it is busy for a mask factory in every country. So do our otai company, because we supply The 42CD4 Plate hot treatment for the mask factory.

My boss sends us a photo of the parts of the mask machine to us in the morning today. I am surprised to see the photo, it looks good .it is the busy season for our mill because many mask-producers are waiting for the product .the size of the part is 40*110*125, another size is 44*118.1*200 .the price is appreciated .

If you have the demand, please connect with me as soon as possible .we hope the shortage of the mask will be solved soon. we also hope the epidemic will be cured soon.

Introduction of otai company

“Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time.” otai company is trying to provide a high-quality product and responsible for every order.

Otaisteel is a stable and reliable supplier for fortune 500 companies at home and abroad, such as ThyssenKrupp, china’s north industries group corporation limited. Otai exports various tool steel and alloy steel to more than 30 countries from Europe and American, the 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

HS6-5-2 Annealled Round Bar Qualified Sales Promotion After Coronavirus in China in March . This time Chinese Spring Festival holiday was very special . We did not use this holiday to party with all our relatives and friends as usual . In the end there was no travel to relax . Instead , we were stayed at home with close relatives . Due to the effects of the new coronavirus . We respond to government calls to isolate ourselves and prevent the spread of the virus . Our efforts have paid off. Most of us are now back to work .

In this month , our HS6-5-2 Annealled Round Bar Qualified have sales promotion to our regular customer . Thanks for all your pay attention to us . All of us hope the world are peaceful .

Otai Special Steel have HS6-5-2 Annealled Round Bar Qualified Sales Promotion After Coronavirus in China in March .

HS6-5-2 Annealled Round Bar Qualified Tool Steel Chemical Composition Properties

HS6-5-2 Annealled Round Bar Qualified Mechanical Properties

• Physical Properties of HSS M2 (Corresponding materials )

• HS6-5-2 Annealled Round Bar Qualified  Tool Steels Properties Mechanical

• HS6-5-2 Annealled Round Bar Qualified Steels Thermal Properties

 Forging of AISI M2 High Speed Steel  (Corresponding materials )

Pre heat M2 HSS steel slowly and uniformly to 850-900°C. The heat should then be increased more quickly to the forging temperature of 1050-1150°C. If during the forging the temperature of the M2 high speed tool steel material drops below 880-900°C, re-heating will be necessary. Cool the M2 steel component very slowly after forging.

• Anneal

Heat to 1600° F, soak thoroughly at heat. Furnace cool 25° F per hour to 900° F, air cool to room temperature. Approximate annealed hardness 241 Maximum Brinell.

Stress Relief of Unhardened Material: Heat slowly to 1200 to 1250° F. Soak for two hours per inch of thickness at heat. Slow cool (furnace cool if possible) to room temperature.

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

42CD4 Round Bar Hot Rolled, otai have promotion about it.

Compared with last week, I find the people are more and more on the street. The company and factory are gradually resuming production. People back to the office, devoted to the work. everything turns to be normal. Everyone in china hopes the epidemic will be disappeared soon. we have 42CD4 Round Bar Hot Rolled in storage. If you have the demand, please let me know.

We can’t predict the future, everything is changeable. We prepared to pay a visit with our clients abroad last year. However, the outbreak of the coronavirus destroyed our plan, so we have to postpone our agenda. To improve the cooperation with our loyal clients, we will arrange the interview this year. Although it is a little hard at the beginning of 2020, we hope the last days will be better day by day. we have the promotion about 42CD4 Round Bar Hot Rolled this month, the quality is assured.

promotion about the 42CD4 round bar hot rolled

OTAI Steel focuses on alloy steel business for more than 20 years, becomes one of the leading special steel stockholders in the South of China step by step. 42CD4 round bar hot rolled become our key product. the black surface plate can support immediately shipment after order confirmed, and milled plate can proceed per customer’s requirement.

OTAI have 10 band saw and milling machine, cut to different size and milling precision requirement per different customer. 42CD4 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 | 42CD4 delivery hardness less than 250HB.

Mr Jack Tan

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com

AISI 4140 AISI 4140 Q+T Round Bar Sales Promotion after coronavirus . Thanks for all your attention to us for China . We are fine now . We are back to office with facemask . And everything like before , surely we may work very hard in this year . Most of Mill Steel factory have resumed production from last week . All productions are fully stocked . Just send your new inquiry to us to get the price  . And the AISI 4140 materials may have new discount now . Please contact with us directly .

AISI 4140 Q+T Round Bar Sales Promotion after Chinese Spring Festival holiday . Due to coronavirus , all company in China have delay to work after Chinese New Year . But the strictly situation only for Wuhan . All have controlled by government . We all back to office this week , and most of important company have resumed production last week .

In the beginning of this month , we have AISI 4140  Q+T Round Bar Sales Promotion . Thanks all our regular customer to care about our healthy and situation . The details please take the below information for confirm .

AISI 4140 Q+T Round Bar Sales Promotion Chemical Composition

 Mechanical Properties of AISI Alloy 4140 Steel Bar, Plates, Square

Forging

Preheat the steel carefully, heat to 1150 oC – 1200 oC maximum, hold until temperature is uniform throughout the section.
Do not forge below 850 oC.Following forging operation the work piece should be cooled as slowly as possible.

 AISI 4140 Steel Grade Heat Treatment

• Annealing
  Heat ASTM 4140 steels to 800 oC – 850 oC, hold until temperature is uniform throughout the section and cool in furnace.
• Normalizing
  Heat steel alloy 4140 to 870 oC – 900 oC, hold until temperature is uniform throughout the section, soak for 10 – 15 minutes and cool in still air.
• Tempering
  Re-heat 4140 grade steel to 550 oC – 700 oC as required, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of section, and cool in still air.

Hardening of AISI Alloy Steel 4140

AISI alloy 4140 steel bar, plate and square can be hardened by cold working, or heating and quenching.

SAE 4140 alloy steel is usually supplied ready heat treated to hardness in 18-22 HRC. If further heat treatment is required, then heat to 840 oC – 875 oC, hold until temperature is uniform throughout the section, soak for 10 – 15 minutes per 25 mm section, and quench in oil, water, or polymer as required.

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com