M35 High Speed Steel can get high hardness (HRC67-70) after heat treatment process, The hardness (625 ℃ for 4 hours and HRC63 ~ 65), and M35 high speed steel with high wear resistance,toughness and bending strength ,it can avoid the mold edge collapse and reduce early damage such as cracks. it is suitable for manufacturing various kinds of tools for strong cutting,such as wear-resisting and impact-resistant tools, advanced punching dies,screw dies.

Chemical composition (%) :

C 0. 80-0.85, Si 0.20 – 0.40, Mn 0.20-0.40, Cr 3.90- 4. 40, Mo 4.75 -5. 25, V 1.75 -2. 15, W 6. 15- 6. 65, Co 4. 75- 5.2

Equivalent grade of M35 High speed steel ：HITACHI standard –YXM4, SKH55, DIN Grade S6525, AISI/SAE M35.

The Properties of M35 high speed steel mold :

• High abrasion resistance,
• High pressure resistance,
• Sintered resistance
• With longer lifecycle

M35 High Speed Steel Delivery Condition and Hardness :

• Annealed, hardness 269HBS,
• Cold drawn hardness 285 HBS,
• The Hardness after Cold drawn, hardness 277HBS.

Temperature of Heat treatment

• Heat treatment : Temperature -1040~1150℃, and the finished temperature is 930℃.
• Annealed : Temperature 870-900℃,The hardness after annealed : 235-369HBS
• Quenching and Tempering:

1. Preheating Temperature: 732~843℃;
2. Quenching : salt bath furnace: 1204℃; controllable furnace: 1216℃; Quenching medium: oil, air cooling or salt bath;
3. Tempering temperature: 540 ~600℃; hardness: 60HRC after tempering

M35 High Speed Steel Applications :

Cold forging dies, stretch dies, cutting tools, etc.

Ms Elwa Lee

Mobile/WhatsApp: 0086-15899675236

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Elwa@otaisteel.com

1.2344 Round bar (also known as AISI H13 steel ) is a tool steel grade standardised for hot working. The main feature of this grade is the combination of alloyed elements of chromium, molybdenum and vanadium, Cr-Mo-V, which provides a high wear resistance to thermal shock. It is well known as for its great strength, and heat resistance. It is heavily used for die casting in the cold heading field. The presence of high vanadium in DIN 1.2344 can handle the abrasion at both low and high temperatures. It always provides a uniform and high level of machinability. This tool steel is mostly used for aluminum, magnesium and zinc die casting.

1.2344 Round bar , AISI H13, stands for American Iron and Steel Institute. Also it was standardised as SKD 61 by Japanese Industrial Standards.

The surface can be nitrided to improve wear resistance .

1.2344 Round bar is widely used in various places in both cold and hot working. In hot work processing DIN 1.2344 shear knives and dummy block extrusion can be used. In cold work process this steel is used for punching, heading and inserting of die blocks. DIN 1.2344 is a high hot-wear resistance and great strength, warm conductivity air hardening and invulnerability to hot cracking. It has a great resistance to abrasion at each low and high temperature due to the presence of high vanadium. The high level of toughness and ductility made it a useful material for die casting in the cold heading field.

1.2344 Round bar and flat sections can be cut to your required sizes. 1.2344 ground steel bar can also be supplied, providing a high quality tool steel precision ground tool steel bar to your required tolerances. 1.2344 Tool Steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes.

Ms Monica Yu

Mobile/WhatsApp: 0086-13711903397

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Monica@otaisteel.com

Saudi Arabia friends purchase 42CrMo4 steel

Saudi Arabian friend purchase 42CrMo4 steel

In April, Otai Steel and Saudi Arabia signed a bidding contract for the use of Otai 42CrMo4 steel. This project was carried out by one of our Asian clients and ender user is a bidding project in Saudi Arabia. This project will last for 3 years. Our customers have won tenders for the materials 42CrMo4 steel and 1045 steel. The specification of 42CrMo4 steel we supply is Φ55mmΦ210mmΦ230mm. In the first stage, they ordered us 9 containers, divided into 3 batches of 3 containers each. Each batch requires SGS on-site inspection. The inspection standard is EN BS 10343-2009. We completed all 3 batches in November this year, and each batch passed the SGS inspection and fully complied with EN BS 10343-2009 standard.

Experience about 42CrMo4 steel SGS inspection report

The SGS report authoritative organization proves that our materials do not have any quality problems in line with European standards. We provide Chinese prices and European quality. For customers who have questions about the quality of Otai materials, I will share this series of SGS reports with them.

Ms Sharon Wan

Mobile/WhatsApp: 0086-13580960968

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Sharon@otaisteel.com

1.2738 steel is a mold steel material produced in accordance with the German DIN standard. It has relatively superior mechanical properties and good processability among similar grades of steel.

1.2738 steel is mainly used for processing and production of hot work molds. Among them, plastic molds are the most common .It is suitable for molds requiring high smoothness such as production of hard rubber (PS) and ABS. It is suitable for large-scale, especially thicker than 400mm plastic molds. This plastic molds require uniform hardness, high toughness and good surface polishing performance. For example like large-scale molds for household appliances, TV casings, photocopier casings and instrument panels.

Some customers focus on the cost, they may purchase the not good 1.2738 steel, which results in the following problems.

The mold steel has many impurities and often encounters sand holes, cracks and pits, and the mold cannot be polished.

The hardness is not uniform, the CNC computer gong processing is difficult to walk. The machine is injured, the processing is difficult when drilling and tapping especially when deep hole drilling is used to process the water delivery hole.

When processing large molds, the hardness of the surface and the core is inconsistent, and the mold is easily deformed, which causes the mold to open and close erratically.

When high pressure injection, the mold is easy to collapse, and there are many plastic products. As a result, the life of the mold is short and the maintenance cost is high.

The 1.2738 steel provided by OTAI has good microstructure density, high hardness and uniformity, and smooth milling. The material has high purity and good mold polishing.We are the very valuable and trustable supplier who supplied for the Thyssen Krupp and Chinese ordnance industry group. We have our own creating technique through this more than 20 years rich experience.

Ms Phoenix Li

Mobile/WhatsApp: 0086-13925830813

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Phoenix@otaisteel.com

OT718H mould steel is a vacuum-melted chromium-nickel-molybdenum alloy steel, which has been quenched and tempered before leaving the factory.

OT718H mould steel has excellent polishing performance and photolithographic properties. It also has high hardenability, good electrical workability and skin texture workability. Pre-hardened steel can be used in the mold cavity without quenching. The flange can be flame hardened, which can increase the hardness to 52HRC.

Fake OT718H mold steel has many harmful impurities and poor polishing properties. It is resulted in poor appearance of plastic products and reducing the grade of plastic products.
Inferior OT718H material has poor purity, many harmful impurities, and unstable steel structure. The instability of the mold size causes the dimensional accuracy of plastic products to decrease. It requires frequent mold repairs, increasing maintenance costs, and reducing product quality and production efficiency. The mold steel alloy is unevenly distributed. The local hardness deviation is large, which resulted in insufficient mold wear resistance. the mold is easy to collapse, and the plastic products have more burrs. It is necessary to periodically weld and repair the mold, and increase the labor of deburring. If it is used for large molds, the mold is deformed severely after processing. That will cause the mold to open and close smoothly.

Application of OT718H mould steel:
1) Large plastic molds such as home appliances, computer shells and other molds.
2) High surface finish plastic molds, such as telephones, speakers, PMMA, etc.
3) Plastic molds with a long-life production capacity of more than 500,000 molds.
4) Due to its high hardness, it can be used for wear-resistant parts such as sliders, inserts and rows of plastic molds.
5) Forming tool, compression-brake die (wan plate machine die), (flame hardening or nitriding treatment can be applied according to production needs).

Our OTAI special steel Cut down 20% composite cost for distributor, and fix miscellaneous difficulties for end user.With over 20 years’ pre-sales and after-sales special steel, we help distributors and end users to avoid all possible swindle and cheat.

Ms Phoenix Li

Mobile/WhatsApp: 0086-13925830813

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Phoenix@otaisteel.com

34CrNiMo6 Round Bar and Seamless Pipe  is an important alloy engineering steel grade as per BS EN 10083-3:2006. 34CrNim06 steel has high strength, high toughness and good hardenability. EN / DIN 34CrNiMo6 alloy steel has the stability of resistance to overheating, but the white sensitivity of 34CrNiM06 is high. It also has the temper brittleness, so the weldability of 34CrNiMo6 material is poor. The steel 34CrNiMo6 needs the high temperature preheating before welding in order to eliminate the stress after welding processing.

34CrNiMo6 Round Bar and Seamless Pipe is used to make tools which demands good plasticity and high strength. It is usually selected to make the big size and important parts, such as heavy machinery axle,turbine shaft blade, high load of transmission parts, fasteners, crank shafts, gears, as well as heavily loaded parts for motor construction etc.

34CrNiMo6 Round Bar and Seamless Pipe Otai Special Steel is reliable to supply engineering 34CrNiMo6 steels / 1.6582 engineering alloy steels. Please tell us your detailed requirements and have the best offer soon.

34CrNiMo6 Round Bar and Seamless Pipe same as 4340 is a medium carbon, low alloy steel known for its toughness and strength in relatively large sections. AISI 4340 is also one kind of nickel chromium molybdenum steels. 4340 alloy steel is generally supplied hardened and tempered in the tensile range of 930 – 1080 Mpa. Pre hardened and tempered 4340 steels can be further surface hardened by flame or induction hardening and by nitriding. The 4340 steel has good shock and impact resistance as well as wear and abrasion resistance in the hardened condition. AISI 4340 steel properties offer good ductility in the annealed condition, allowing it to be bent or formed. Fusion and resistance welding is also possible with our 4340 alloy steel. ASTM 4340 material is often utilized where other alloy steels do not have the hardenability to give the strength required. For highly stressed parts it is excellent choice. AISI 4340 alloy steel can also be machined by all customary methods.

Ms Monica Yu

Mobile/WhatsApp: 0086-13711903397

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Monica@otaisteel.com

D2 1.2379 SKD11

D2 1.2379 SKD11

PHYSICAL PROPERTIES

• Density: 0.278 lb/in3 (7695 kg/m3)
• Specific Gravity: 7.70
• Modulus of Elasticity: 30 x 106 psi (207GPa)
• Machinability: 50-60% of a 1% carbon steel

Preheating: To minimize distortion and stresses in large or complex tools use a double preheat. Heat at a rate not exceeding 400°F per hour (222°C per hour) to 1150-1250°F (621-677°C) equalize, then heat to 1400-1450°F (760-788°C). For normal tools, use only the second temperature range as a single preheating treatment.

Austenitizing (High Heat): Heat slowly from the preheat. Furnace or Salt: 1850-1875°F (1010-1024°C).

Quenching: Air or pressurized gas to 150-125ºF (66-51ºC). Sizes up to 4 inches (101.6 mm) in thickness will through harden when air cooled from 1575ºF (857ºC). Sizes up to 6 inches (152.4 mm) in thickness will through harden when air cooled from 1625ºF (885ºC).

Tempering: Temper immediately after quenching. Hold at temperature for 1 hour per inch (25.4 mm) of thickness, 2 hours minimum, then air cool to ambient temperature. The typical tempering range is 350 to 400ºF (177 to 204ºC).

For maximum wear resistance, temper between 300-350°F (149-177°C) for a hardness of 62-64 HRC. For the optimal balance between wear resistance and toughness, temper between 500-550°F (260-288°C). This will produce 58-60 HRC.

For maximum toughness, double temper, 2 hours plus 2 hours, at temperatures above 950°F (510°C). This will produce hardness of less than 58 HRC.

To minimize internal stresses in cross sections greater than 6 inches (152.4 mm) and to improve stability in tools that will be EDM’d after heat treatment, soaking times of 4 to 6 hours at the tempering temperature below 950°F (510°C) are strongly recommended.

Annealing: Annealing must be performed after hot working and before re-hardening. Heat at a rate not exceeding 400°F per hour (222°C per hour) to 1600-1650°F (871-899°C), and hold at temperature for 1 hour per inch (25.4mm) of maximum thickness; 2 hours minimum. Then cool slowly with the furnace at a rate not exceeding 50°F per hour (28°C per hour) to 1000°F (538°C). Continue cooling to ambient temperature in the furnace or in air. The resultant hardness should be a maximum of 255 HBW.

WhatsApp: +86-769-23190193

Tel: +86-769-23190193

Fax: +86-769-88705839

Email: Jack@otaisteel.com

Classification of high-speed steel:

1. Basic high-speed steel: omitted
2. General-purpose high-speed steel: Representative steel: M2

Did you choose the right high speed steel M2 for the cutter?

Tool classification:

The first category: 1. Carbon tool steel cutting tools
2.Alloy tool steel cutter

The hardness is between HRC60-63,suitable for low-speed cutting, and the red hardness is 350. the following.

The second category: high-speed tool steel cutting tools

1. General-purpose high-speed steel cutters with hardness between HRC60-63;
2. Super-hard high-speed steel cutters with hardness between HRC66-70.
Suitable for high-speed cutting, with red hardness of 600. the following.

The third category: 1. Carbide cutting tools: (powder) WCCo alloy

1, cubic boron oxide;
2. Diamond cutter: (cannot process steel)
3, ceramic tools: red and hard in 800-1200. between.

Classification of high-speed steel:

1. Basic high-speed steel: omitted
2. General-purpose high-speed steel:
The most representative steel abroad: High speed steel M2—W6Mo5Cr4V2
The most representative steel in China: W9—W9Mo3Cr4V; W18—W18Cr4V
3. Super-hard high-speed steel: Representative steel—M42
The most representative steel abroad: Co-hardened ① United States: M42—W2Mo9Cr4VCo8;② Germany: W10Mo3Cr4 V3Co10

If you need more information of high speed steel M2 or other high speed steel for cutter,please do not hesitate to contact me.

M2 high speed steel Related Specifications ASTM A600-1999 M2 HSS steel data pdf down

Related Specifications and Equivalent of ASTM M2 high speed tool steel with others HHS Material Standard

Ms Sharon Wan

Mobile/WhatsApp: 0086-13580960968

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: Sharon@otaisteel.com

D2 tooling steel -Chapter 6

CHAPTER 6 DOES D2 STEEL BENEFIT FROM CRYO TREATMENT?

Cryo treatment is subjecting semi-finished blades to temperatures as low as -300°F for a specified time. Bob Dozier doesn’t use cryo treatment for his knives, while other makers swear by it. I have seen evidence that some steels subjected to specific heat treatment procedures benefit markedly from cryo treatment. But the benefits are not uniform for all steels, and cryo treatment temperatures and soak times do vary. As with all other aspects of knifemaking, cryo treatment results vary with different application methodologies.

IS D2 DIFFICULT TO SHARPEN?

There is no definitive yes or no for this question. I don’t find Charles Allen’s Diamond Blade knives, which Rockwell test at 66-68, any more difficult to sharpen than his Knives of Alaska blades that Rockwell at 58-60. I have found D2 knives that were much more resistant to abrasion from even diamond hones. But I have found D2-bladed knives from the same manufacturer that produced the most difficult to sharpen examples. Individual results vary even within the same brand.

SO, THEN, WHAT KIND OF KNIFE CAN D2 STEEL REALLY MAKE?

There is something for everyone, and I am going to let each knife enthusiast discover what suits him or her best. For me, that’s the fun part. I will tell you that, for my knife applications, I usually carry more than one knife, and as often as not, one of those knives has a D2 blade, while the second doesn’t.

Which D2-bladed knife I carry depends on the circumstances. If there is one knife that does all things equally well for all applications, I haven’t found it — but I will keep looking. If nothing else, it provides my loved ones with the certain knowledge of one thing — I will always appreciate getting more knives on special occasions.

What kind of knife can you get with D2 steel? Just about any type ranging from Dawayne Batten’s handmade spring-back gentleman’s folders (top and bottom) to Microtech’s hard-use tactical fixed-blade Currahee model (center). Enjoy making your choice.

I conclude by paraphrasing the late Butch Winter. There are no bad D2 knives, although some may suit certain applications better than others. You decide for yourself which D2 knife suits your needs best. I should warn you that I have been unable to stop with just one.

WhatsApp: +86-769-23190193

Tel: +86-769-23190193

Fax: +86-769-88705839

Email: Jack@otaisteel.com

Everyone also knows that the price of special alloy steel is more expensive, but if we know this, we will not feel expensive. The steel industry, upstream of the industry’s supply chain, is iron ore, coke, non-ferrous metals, natural gas, etc. These have profoundly affected the pricing of steel. However, to explore the price of special steel more specifically, the following factors may be found.

I am an employee of Otai Special Steel Co Ltd, we mainly sell special alloy steel.so what is special alloy steel? special alloy steel refers to steels with special chemical composition, produced by special processes, with special structure and properties, and can meet special needs.

Everyone also knows that the price of special alloy steel is more expensive, but if we know this, we will not feel expensive. The steel industry, upstream of the industry’s supply chain, is iron ore, coke, non-ferrous metals, natural gas, etc. These have profoundly affected the pricing of steel. However, to explore the price of special steel more specifically, the following factors may be found.

mainly reason

1 raw material

why special alloy steel is called “special” steel, the reason is that its composition differs from ordinary steel, and one or several precious metal elements are added, such as molybdenum, nickel, chromium, titanium, cobalt, and so on.

2 production process

Ordinary smelting methods can be used for ordinary steels. Due to the harsh service environment, special steels have high requirements for material properties. To achieve the purpose of corrosion resistance, wear resistance, high-temperature resistance, impact resistance, etc. special melting method must be applied in. In these methods, equipment is complicated and expensive, and the energy consumption is large.

3 Processing cost

The smelting process is the processing process, casting, forging, piercing, etc., each additional production pass is a cost increase. Processing cost plus material loss, the price goes up.

4 cost of capital

End-user requirements are usually small batches, multiple varieties, and multiple specifications, so for distributors, inventory materials can only be sold slowly.

5 Supply and demand

Because of the special nature of the special steel material, the seller is very strong. If special steel, there are only one or two suppliers worldwide, the price will certainly not be cheap.

The above factors generally determine the pricing of special alloy steel in the market. Therefore, the price of special steel is expensive, You cannot simply think it is the problem of the supplier. I think customers should care about the quality of special steel, rather than only looking at the price.

Introduction of Otai Steel

Otai Steel supplies a wide range of carbon, alloy, and stainless steel products, After almost 20 years of development and growth, Otai Steel becomes one comprehensive special steel factory, stockist and exporter. Due to satisfactory reliable quality and professional service, Otai expands our market worldwide, reasonable price is provided, welcome to send the inquiry.

Mr Jack Tan

Tel: 0086-769-23190193

Fax: 0086-769-88705839

Email: jack@otaisteel.com