About: Cathy Liu

4140 Alloy Structural Steel

ASTM 4140 Steel is a Alloy Structural Steel. AISI 4140  is a chromium molybdenum alloy steel, widely used in Oil and Gas industry and Large Machinery Strutural. Also used for  components like axles, shafts, bolts, gears and other applications. 4140 Steel Plate China Supplier and factory Otai Special Steel Supply ASTM 4140 steel in Round bar, Plate, Flat bar, Square, Forging Ring and others any shape. And provide cutting, sawing, milled, machining processing.

4140 Steel sheet equivalent standards:

4140 steel Mechanical Properties:

Tensile strength:655 MPa

Yield strength:415 MPa

Elongation at break (in 50 mm):25.70%

Poisson’s ratio:0.27-0.30

How to select the right tool steel for your products?

The brand of tool steel and its application
Tool steels are available in various grades depending on their composition, the temperature range of forging or rolling and the type of hardening they experience. The general grades of AISI – SAE tool steel are O1, A2, and D2. These standard grades of steel are considered cold work steel, which can keep its cutting edge at up to about 400 °C. They have good hardness, wear resistance and deformation resistance.

Check our tool steel products page:https://otaialloysteel.com/products/tool-steel/
O1 is a kind of oil hardening steel with high hardness and good cutting processability. The grade of tool steel is mainly used for cutting tools, drill bits and knives and forks.
A2 is an air hardening steel containing an intermediate equivalent amount of alloy material (chromium). It has good machinability and wear resistance and toughness balance. A2 is the most commonly used air hardening steel variety, which is commonly used in punching and shaping punch, edge cutting mold and injection mold.
D2 steel can be Oil hardened or air hardened and contain a higher percentage of carbon and chromium than O1 and A2 steels. It has high wear resistance, good toughness and low deformation after heat treatment. The high carbon and chromium content in D2 steel makes it an ideal choice for the application that needs longer tool life.

Other tool steel grades include different types of alloys with a higher percentage, such as high speed steel M2, which can be selected for mass production. Various hot working steels can be up to 1000 ° C keep sharp cutting edge at higher temperature.

How can tool steel fail?
Before selecting tool steel grade, it is important to consider which tool is most likely to fail in this application by checking the failure tool. For example, some tools fail due to abrasive wear, in which the material being cut will wear the surface of the tool, although this type of failure occurs slowly and is predictable. Tools that wear to failure require tool steel with higher wear resistance.
Other types of faults are more catastrophic, such as cracking, fragmentation, or plastic deformation. For tools that have been broken or cracked, the toughness or impact resistance of tool steel should be increased (note that impact resistance will be reduced due to notch, undercut and sharp radius, which are common in tools and dies). For tools that deform under pressure, the hardness shall be increased.
But remember that the properties of tool steel are not directly related to each other, so for example, you may need to sacrifice toughness for higher wear resistance. That’s why it is so important to understand the characteristics of different tool steels and other factors (such as the geometry of the mold, the materials being processed, and the manufacturing history of the tool itself).

Tool steel cost
The last issue to consider when selecting tool steel grades is cost. If the tool is proven to be inferior and fails prematurely, the cut in in material selection may not reduce the overall production cost. Cost benefit analysis shall be carried out to ensure that the selected tool steel material can provide the required performance.

65Mn spring steel round bar

Spring steel, check:https://otaialloysteel.com/products/spring-steel/ 

China steel price Increasing

Since the beginning of this year, the rapid rise of steel prices has aroused social concern. What are the reasons for the rise in steel prices? What are the derivative effects of the rise in steel prices? What will be the trend of steel price in the future?

Steel price “roller coaster” led to a surge in the cost of downstream industries.

According to the monitoring of China Iron and Steel Industry Association, from the beginning of this year to the middle of May, the domestic steel price went out of a wave of rising market. As of May 14 this year, the domestic steel composite price index (CSPI) was 174.81 points, up 40.4% from the end of last year; The long timber price index was 179.56 points, up 42.2% from the end of last year; The price index of sheet metal was 175.07 points, up 38.7% from the end of last year, reaching a historical high of more than 10 years.

The reason for this round of steel price rise is mainly the spillover effect brought by the expansionary quantitative easing policy of developed economies in Europe and the United States, which gave birth to the expectation and trend of raw material price rise in the world. At the same time, China’s economic development is resilient, exports are strong, manufacturing investment is supported, and consumption continues to recover marginally, which also drives the growth of steel demand and drives up steel prices.

“The rise of iron ore is larger than that of steel price, which is an important factor in the rise of steel price. The financial attribute of iron ore futures makes the market speculative, which promotes the continuous rise of steel price.”measures such as double control of production capacity and output, environmental protection and production restriction, and steel de production capacity, etc, It also increases the market’s expectation of the reduction of steel supply and the rise of steel price.
In the face of steel prices continue to hit new highs, the cost pressure of downstream steel industry is obvious, not only facing the difficulty of increasing costs, but also the more serious problem is the shortage of funds and increased occupation. Some downstream enterprises have weak ability to transfer costs. The rise of steel prices has caused a substantial reduction in profits and even losses, and the willingness to purchase steel will gradually decrease.
It is worth noting that the adverse effects of the recent rising commodity prices have attracted the attention of the relevant state departments.https://otaialloysteel.com/contact/

On May 12, the executive meeting of the State Council called for tracking and analyzing the situation and market changes at home and abroad, doing a good job in market regulation, and coping with the rapid rise of commodity prices and its associated effects. On May 19, the executive meeting of the State Council proposed that we should do a good job in ensuring the supply and stabilizing the price of bulk commodities, curb the unreasonable price rise, and strive to prevent the transmission to consumer prices. On May 26, the executive meeting of the State Council demanded that we should do a good job in ensuring the supply and stabilizing the price of bulk commodities, and crack down on hoarding and driving up prices. At the same time, on May 23, the national development and Reform Commission, the Ministry of industry and information technology, the state owned assets supervision and Administration Commission, the General Administration of market supervision and the China Securities Regulatory Commission jointly interviewed key enterprises with strong market influence in iron ore, steel, copper, aluminum and other industries. They were required to take the lead in maintaining the market price order of bulk commodities, not to collude with each other to manipulate market prices, fabricate and disseminate price increase information, and not to hoard Bid up prices.
Affected by this, since May 20, all kinds of steel products in the national steel market have decreased by more than 10%. On May 21, the domestic steel composite price index was 154.34 points, which has fallen back to the level at the beginning of May.
Steel and other commodity prices fell, mainly due to the government’s strict supervision measures. This shows that the rapid rise of commodity prices in the early stage is due to the dislocation of supply and demand, as well as the market’s follow-up speculation and even bid up prices.
Recently, the prices of raw materials, including steel, have risen sharply, and some downstream industries are under great pressure. The sharp rise in prices is likely to be accompanied by a sharp decline. The market trend in may fully illustrates this phenomenon. At present, the price of steel has fallen back to the level before the May Day holiday, but the price of raw materials has not fallen at the same time. In fact, it is unfavorable for iron and steel enterprises.
Therefore, iron and steel enterprises should take the lead in maintaining the price order of steel market, and do not engage in low price dumping and vicious competition; Do not collude with each other to manipulate the market price, fabricate and spread price information; Do not hoard and drive up prices. At the same time, it is necessary to adjust the export strategy, put the starting point and foothold on meeting the domestic demand, give play to the role of supplement and adjustment of import and export, and adapt to the new development pattern of iron and steel import and export.
At present, from the domestic market situation, there is no overall and trend change in the supply and demand of iron and steel products, and the steel price does not have the basis for continuous and substantial rise. From the supply side, the crude steel output reduction and environmental protection supervision are about to start, and it is difficult for the crude steel output to increase significantly in the later stage; From the demand side, due to the rapid rise of steel prices since April, shipbuilding, home appliances and other downstream steel industries can not bear the pressure brought by the high consolidation of steel prices, and it is difficult for steel prices to rise significantly in the later period.
Industry insiders believe that from an international perspective, the world economic recovery is still unstable and unbalanced, there is no overall and trend change in the supply and demand of bulk commodities, and their prices do not have the basis for long-term rise.
In the future, with the slowing down of macro-economy, the market demand side will return to a reasonable level. With the gradual narrowing of domestic and international price gap, the export tax rebate adjustment policy will gradually play a role, the domestic supply will increase, and the steel price will gradually return to a reasonable range.
(Source: People.cn)

4140 plate & tool steel to Sri Lanka

Why Pakistani customer turn to Otai Steel?

Otai accepts all kinds of large, medium and small orders, and can help customers with cutting, machining, and heat treatment to solve customers’ problems in one stop.

Otai’s advantage:
1. There are thousands of tons of steel inventory(https://otaialloysteel.com/products/ )in our warehouse, especially for 4140/42CrMo plate, Otai is the largest stockist in South China.
2. Small order can be received. Compared with large steel mills, MOQ is lower, which is more conducive to foreign small and medium stockers.
3. We can finish all kinds of machining process like milling, polishing, turning and other processing.
4. With independent testing equipment, including spectrometers, UT flaw detection equipment, etc., compared to traders, we can fully guarantee product quality for customers.

3 major traps in steel procurement:

• Using low-value materials as high-value materials; Otai will never be provide shoddy goods.
• Offering low prices to attract customers regardless of customer performance requirements; Otai will only quote the most accurate price based on customer needs.
• Delivery is not possible within the delivery period, making customers unable to keep up with the project; Otai promises to deliver within the fastest delivery time.

There are a Pakistani customer who had cooperated with us for many years, but in 2020 he didn’t place order, said that there was something wrong with our hardness. But he came back to us, place an order this year and paid the price the next day once we sent him the quotation. You know why? In fact, the customer recognized the quality of our products. Last year, he might have bought a bargain with an Indian supplier,  he now realizde that our products are reasonable in price and guaranteed in quality after stepping on a pit from other suppliers.

ThyssenKrupp, Bohler and other top 500 brands are loyal customers of Otai for many years.

Directly click wechat and WhatsApp windows to respond immediately and solve the problem for you!

Shipment to South Africa

Kuwait customer’s shipment

Steel Pipes

(Shanghai to Kuwait)

What is the difference between 42CrMo and 42CrMo4?

42CrMo is a medium carbon alloy structural steel with good comprehensive properties and hardenability. It is often used in manufacturing gear, connecting rod, high strength bolts and other important parts in the processing process.
They come from different standards in different countries. 42CrMo is the material of Chinese standard GB / T 3077 and the specification of alloy structural steel. The material of 42CrMo4 belongs to EN 10083 series, Quenched and tempered steel.

1. Differences in chemical composition. As shown in the figure below, there is a slight difference in the content of element Si, and the content of Si in 42CrMo is less than that in 42CrMo4. In addition, according to gb3077, P and s contents can be divided into three grades, while 42CrMo4 only limits its maximum content.

2. Different Hardenability Requirements. The hardenability of 42CrMo has no specific value of quenching bandwidth. If there are special requirements, the buyer and the supplier can discuss the solution by themselves. The specific value of hardening bandwidth is specified in 42CrMo4. 42CrMo4 is divided into three grades h, HL and HH for reference when ordering.

3. Different delivery conditions. 42CrMo pipes are usually delivered in hot rolling and hot forging conditions. If the customer needs heat treatment conditions (annealing, normal goods, high temperature tempering), it should be indicated in the contract. For en1008342crmo4 pipe, there are five delivery conditions to choose from: no heat treatment, heat treatment, softening annealing, quenching and high temperature tempering.

4. Differences in impact test requirements. When the impact test is carried out according to GB / t2975, 42CrMo sample is taken at 1 / 4 of the outer diameter of the rod as the center of the rod with diameter greater than 50 mm. When the diameter of the sample bar is 25 mm, it should be modulated according to the requirements of heat treatment process, and then the tensile sample should be tested. In en10083 standard, bars are tempered according to the recommended heat treatment. When the sampling diameter is greater than 25 mm, the sampling position should be centered 12 mm around the outer diameter of the rod. In addition, 42CrMo uses Charpy u-notch toughness, while 42CrMo4 uses Charpy V-notch toughness. The two notches have the same depth, but the radii at the bottom of the notches are different (U-shaped 1 mm, V-shaped 0.25 mm).

Hot rolled carbon steel is a kind of metal alloy, which is mainly composed of iron and some carbon. These carbon will be rolled from the ingot to a certain size at a temperature higher than its recrystallization temperature. Forming hot rolled carbon steel at such a high temperature gives it excellent mechanical properties while keeping the cost lower than that of cold rolled carbon steel.

ASTM A36

ASTM A36 steel is one of the most popular hot rolled steels sold by steel mills. For hot rolled steel A36 is ASTM specified material. It is considered low carbon steel because its carbon content is usually 0.25% to 0.29% by weight. The “36” in A36 is important because it specifies a minimum yield tensile strength of 36000 psi. A36 has high machinability, weldability and excellent mechanical properties. This is one of the reasons why it is so popular, and part of the reason why it is widely used in structural applications.

C1010 and C1018
AISI C1010 and AISI C1018 are two very similar hot rolled steels. They are all low carbon. In fact, the only obvious difference between their chemical composition is their carbon content. C1010 is 0.08% to 0.13% by weight of carbon and C1018 is 0.14% to 0.20% by weight of carbon. Differences in carbon content between them may lead to slight changes in ductility and tensile strength, but in most cases they are very similar. Compared with alloy steel and high carbon steel, they are weldable, machinable and relatively easy to form. Tube C1010 and rod and mesh C1018. C1010 and C1018 are widely used in structural applications, as well as in automotive and furniture industries.

A1011
A1011 is another ASTM specified hot rolled steel plate. The grade can also have a small amount of other trace elements, making it a very flexible steel. It is widely used in steel structural applications, car body, drum, and general metal manufacturing.

C1026
C1026 is AISI specified steel, which closely imitates astm-a36 specified steel, as mentioned above. Their chemical properties overlap greatly, and their carbon content constitutes the upper limit of low carbon steel. Aisi 1026 has a target carbon content of 0.22% and 0.26% by weight. When they are all hot rolled, their mechanical properties are very similar. Both AISI c1026 and ASTM A36 are good choices when hot rolled strips are needed, with more strength in addition to a1011, C1010, C1018 or available. Several AISI hot-rolled steel parts are used in the field of automotive structures, such as c1026. C1026 is available in square and rectangular tubes.

A500
ASTM A500 is another low carbon hot rolled steel. It can pass its chemical composition in weight with up to 0.26% carbon and is quite similar to ASTM A36. The main difference between ASTM A500 and ASTM A36 is the shape available for each hot rolled steel. As mentioned earlier, A36 is available in round bar, rectangular bar, square bar, channel steel, angle steel, plate, pedal, round pipe, and shafting. A500, on the other hand, is used only for pipes, similar to other low carbon hot rolled steel plates for ASTM A500 applications; they are widely used in structural applications.

C1045
C1045 is another hot rolled steel designated by AISI. The difference between this hot rolled steel and the steel mentioned before is that it is medium carbon steel. When the carbon content is 0.42% to 0.50% by weight, it usually provides higher strength than low carbon hot rolled steel. C1045 also has enough carbon to be easily heat treated. This means that the mechanical properties can be changed by quenching, hardening and annealing. The use of c1045 is similar to that of low carbon hot rolled steel, but it is usually preferable to low carbon steel when strength is more concerned than ductility.

C1141
AISI c1141 is another medium carbon hot rolled steel, similar to c1045. However, AISI c1141 has different properties due to the addition of sulfur and manganese. First, heat treatment is more effective on c1141 than c1045. Secondly, c1141 is considered as a free working steel. This means that it’s easier on the machining tool, which is important as the carbon content increases, because the corresponding increase in hardness affects machinability. However, it is important to note that the addition of sulfur, which makes c1141 easy to process, also generally makes it non weldable. AISI c1141 is often used in parts that require a lot of machining and some types of fasteners.

1.8519 Steel (1.8519 material) is an alloyed, tempered nitrided steel and is characterized by high wear resistance with its low-ferrite tempered structure. The small amount of alloy of the elements molybdenum and vanadium improves the tempering resistance and reduces the sensitivity to temper embrittlement.

Below please check 1.8519 datasheet:

1.8519 material equivalent standards:

1.8519 mechanical properties:

Tensile strength： Rm 900 – 1100 N / mm2
Brinell hardness： 284 – 346 HB
Yield strength： Rp0.2> 700 N / mm²
strain： > 11%

Constriction of fracture：> 45%

1.6587 Alloy steel

EN 1.6587 steel is an alloy steel formulated for primary forming into wrought products. 1.6587 is the EN numeric designation for this material. 18CrNiMo7-6 is the EN chemical designation.

It has a moderately high density among EN wrought alloy steels. In addition, it has a fairly high base cost and a moderately high electrical conductivity.

1.6587 steel mechanical properties:

• Tensile strength:650 – 880MPA
• Yield strength:350-550MPA
• Fatigue:275 – 275MPA
• Elongation:8 – 25%

1.6587 Steel equivalent standards: