Special Steel SUJ2 Bearing Steel Round Bar

Special Steel SUJ2 Bearing Steel Round Bar System 1

Special Steel SUJ2 Bearing Steel Round Bar

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Loading Port:: China main port

Payment Terms:: TT OR LC

Min Order Qty:: 30 m.t.

Supply Capability:: 10000 m.t./month

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Product information:

Standard				JIS
Grade				SUJ2
MOQ				1 Metric Ton
Diameter				8mm~1500mm
Length				6m,12m or as required.
Diameter Tolerance				within the allowable range or as required.
Condition of delivery				Hot rolled (forged) without annealing,annealing,cold drawn,polished or as required.
Chemical Composition(%)
C	Si		Mn			P		S		Cr
0.95-1.05	0.15-0.35		0.25-0.45			≤0.025		≤0.025		1.40-1.65
Ni	Mo		Cu			Ni+Cu
≤0.30	≤0.08		≤0.25			≤0.50
Mechanical Properties(In Quenching and Tempering)
Tensile strength		Yield strength			Elongation		Reduction in Area		Impact		Hardness
(σb/MPa)		(σs/MPa)			(δ5/%)		(ψ/%)		(J)		(HRC)
861.3		518.42			27.95		--		--		25.8

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Special Steel SUJ2 Bearing Steel Round Bar

Shipping

1. FedEx/DHL/UPS/TNT for samples, Door-to-Door;

2. By Air or by Sea for batch goods, for FCL; Airport/ Port receiving;

3. Customers specifying freight forwarders or negotiable shipping methods!

Delivery Time: 3-7 days for samples; 5-25 days for batch goods.

Payment Terms

1.Payment: T/T, L/C, Western Union, MoneyGram,PayPal; 30% deposits; 70% balance before delivery.

2.MOQ: 1pcs

3.Warranty : 3 years

4.Package Informations: 1) EXPORT, In 20 feet (GW 25 ton) or 40 feet Container (GW 25 ton)

2)as customer's requirement

Why choose us?

(1) The leading exporter in China special steel industry.

(2) Large stocks for various sizes, fast delivery date.

(3) Good business relationship with China famous factories.

(4) More than 7 years steel exporting experience.

(5) Good after-sales service guarantee.

Q:Can special steel be used in construction?: Yes, special steel can definitely be used in construction. Special steel refers to steel alloys that have been specifically designed and manufactured to possess certain properties and characteristics that make them suitable for various applications, including construction. One of the most common types of special steel used in construction is known as structural steel. This type of steel is specifically designed to have higher strength, durability, and flexibility compared to regular carbon steel. Structural steel is often used in the construction of buildings, bridges, and other infrastructure projects due to its ability to withstand heavy loads and resist external forces such as wind, earthquakes, and impact. Special steel also offers other advantages in construction. For example, stainless steel is commonly used in the construction of architectural features and building facades due to its corrosion resistance and aesthetic appeal. Additionally, weathering steel, which forms a protective rust-like coating when exposed to the elements, is often used in outdoor structures and bridges to eliminate the need for regular painting and maintenance. Furthermore, special steel can be tailored to meet specific requirements in construction projects. For instance, high-strength low-alloy (HSLA) steel is used in the construction of tall buildings and structures to reduce weight while maintaining structural integrity. This allows for more efficient use of materials and cost savings. In summary, special steel is widely used in construction due to its superior strength, durability, corrosion resistance, and other desirable properties. Its versatility allows for the optimization of construction projects, ensuring safety, longevity, and cost-effectiveness.

Q:What are the properties of high-strength alloy steel?: High-strength alloy steel possesses several important properties, including exceptional strength, hardness, and wear resistance. It also exhibits excellent toughness, allowing it to withstand high-stress applications without fracturing or deforming. Additionally, this type of steel often maintains its mechanical properties even at elevated temperatures, making it suitable for use in extreme environments. Finally, high-strength alloy steel typically offers good corrosion resistance, which allows it to withstand exposure to various chemicals and harsh conditions.

Q:What are the different methods of surface pickling for special steel?: There are several methods of surface pickling that can be used for special steel. These methods include: 1. Acid Pickling: This is the most common method used for pickling special steel. It involves immersing the steel in an acid solution, usually hydrochloric acid or sulfuric acid, to remove any surface impurities. The acid reacts with the oxide layer on the steel, dissolving it and leaving behind a clean surface. 2. Electrolytic Pickling: In this method, an electric current is passed through the steel while it is immersed in an electrolyte solution. This causes a chemical reaction that removes the surface impurities. Electrolytic pickling is a more controlled process and can be used to achieve a more uniform surface finish compared to acid pickling. 3. Mechanical Pickling: This method involves using mechanical means to remove the surface impurities from the steel. It can be done using abrasive materials, such as sandpaper or wire brushes, to physically scrub the surface and remove any scale or rust. Mechanical pickling is often used in combination with acid or electrolytic pickling to achieve the desired surface finish. 4. Passivation: After pickling, special steel can undergo passivation to enhance its corrosion resistance. Passivation involves treating the steel with a chemical solution, typically nitric acid or citric acid, to create a protective oxide layer on the surface. This layer helps to prevent further corrosion and improves the overall durability of the steel. It is important to note that the specific method of surface pickling used for special steel may vary depending on the type of steel, the desired surface finish, and the intended application. Therefore, it is crucial to consult with experts or follow the manufacturer's guidelines to ensure the appropriate method is used for pickling special steel.

Q:How does the heat treatment process affect special steel?: The heat treatment process can significantly impact the properties of special steel. It involves heating the steel to a specific temperature and then cooling it in different ways to achieve desired hardness, strength, and other mechanical properties. By carefully controlling the heating and cooling rates, the heat treatment process can alter the microstructure of the steel, allowing for the formation of various phases and structures. This can result in improved hardness, toughness, and wear resistance, making the special steel more suitable for specific applications. Additionally, heat treatment can also relieve internal stresses and improve dimensional stability, enhancing the overall performance and durability of the special steel.

Q:What are the casting methods for special steel?: There are several casting methods used for special steel, including investment casting, sand casting, and centrifugal casting. Investment casting involves creating a wax pattern of the desired shape, which is then coated in ceramic and melted away, leaving a cavity that is filled with molten steel. Sand casting involves making a mold from a mixture of sand and a binder, and pouring molten steel into the mold cavity. Centrifugal casting utilizes centrifugal force to distribute molten steel into a mold, resulting in a more uniform casting with fewer defects.

Q:What are the challenges in recycling special steel?: One of the main challenges in recycling special steel is the complexity of its composition. Special steel often contains various alloying elements and additives that can make the recycling process more difficult. These elements need to be carefully identified and separated in order to maintain the desired properties of the recycled steel. Additionally, special steel may have undergone specific heat treatments or surface coatings, which further complicate the recycling process. Proper sorting, identification, and treatment techniques are necessary to overcome these challenges and ensure the successful recycling of special steel.

Q:What are the different methods for improving the corrosion resistance of special steel?: There are multiple techniques available to enhance the corrosion resistance of special steel. 1. Alloying: Adding alloying elements, like chromium, nickel, and molybdenum, to the steel composition is a widely used method. These elements create a protective layer on the steel surface, preventing corrosion. For instance, stainless steel contains a substantial amount of chromium, which forms a passive film that shields the steel from corrosive surroundings. 2. Surface treatments: Diverse surface treatments can be applied to special steel to augment its corrosion resistance. These treatments include electroplating, hot-dip galvanizing, and chemical passivation. Electroplating involves coating the steel with a layer of zinc or nickel, serving as a sacrificial anode that safeguards the steel from corrosion. Hot-dip galvanizing entails immersing the steel in molten zinc to form a durable and corrosion-resistant layer. Chemical passivation involves treating the steel with a solution that eliminates surface impurities and forms a protective oxide layer. 3. Protective coatings: The application of protective coatings can considerably enhance the corrosion resistance of special steel. Coatings like paint, epoxy, or polyurethane act as barriers, preventing moisture and corrosive substances from contacting the steel surface. These coatings can be applied through spray, dip, or powder coating methods. 4. Heat treatment: Modifying the microstructure of special steel through heat treatment improves its corrosion resistance. Processes like annealing, quenching, and tempering can alter the steel's properties, making it more resistant to corrosion. Heat treatment can also alleviate internal stresses that contribute to corrosion. 5. Environmental control: Controlling the environment in which the special steel is utilized can also aid in improving its corrosion resistance. This includes maintaining appropriate humidity levels, controlling pH, avoiding exposure to corrosive chemicals, and implementing effective ventilation systems. By minimizing the exposure of special steel to corrosive elements, its corrosion resistance can be enhanced. In conclusion, a combination of these methods can be employed to enhance the corrosion resistance of special steel, ensuring its durability and performance in corrosive environments.

Q:How is nitrogen alloyed steel used in the production of high-strength bolts?: Nitrogen alloyed steel is used in the production of high-strength bolts to enhance their mechanical properties and increase their strength. By adding nitrogen to the steel, it improves the hardness, toughness, and corrosion resistance of the bolts. This makes them suitable for applications that require high tensile strength and durability, such as in construction, automotive, and aerospace industries.

Q:What are the specific requirements for special steel used in the marine shafting industry?: The marine shafting industry has specific requirements for special steel, which are as follows: 1. Corrosion Resistance: The steel used in marine shafting must possess a high resistance to corrosion, as it is exposed to harsh marine conditions. It should be able to withstand saltwater, humidity, and other corrosive elements without deteriorating. 2. Strength and Toughness: Marine shafting steel should have high strength and toughness to withstand the heavy loads and vibrations experienced in marine operations. It should be able to handle continuous stress and dynamic loads without failing or deforming. 3. Fatigue Resistance: The steel used in marine shafting should have excellent fatigue resistance to endure the cyclical loading during operation. It should be able to withstand millions of load cycles without developing cracks or fractures. 4. Dimensional Stability: Special steel used in marine shafting must maintain dimensional stability to ensure accurate alignment and fit within the machinery. It should have minimal dimensional changes under varying temperature and humidity conditions to preserve the integrity of the shaft system. 5. Machinability: The steel used in marine shafting must be easily machinable to create intricate shapes, such as propeller shafts and couplings. This allows for efficient manufacturing and maintenance of the shafting components. 6. Non-Magnetic Properties: Special steel used in marine shafting should have low magnetic permeability to avoid interfering with sensitive navigation and communication equipment. Non-magnetic properties minimize the risk of compass errors and electromagnetic interference. 7. Certification and Compliance: The steel used in marine shafting should meet specific industry standards and certifications, such as those established by classification societies like the American Bureau of Shipping (ABS) or the International Association of Classification Societies (IACS). These certifications ensure the steel's quality, performance, and compliance with safety regulations. By meeting these specific requirements, the special steel used in marine shafting guarantees reliable performance, durability, and safety in marine applications.

Q:How does special steel contribute to the energy storage sector?: The energy storage sector heavily relies on special steel, which plays an indispensable role by supplying critical components for various energy storage systems. One notable application of special steel lies in the production of batteries, which are crucial for storing energy in diverse forms. Special steel possesses exceptional qualities that make it an ideal choice for battery casings and frames. Its high strength, excellent corrosion resistance, and durability enable battery casings made from special steel to endure high pressures and shield internal components from external impacts. As a result, the entire energy storage system is ensured of safety and reliability. Moreover, special steel finds utility in the creation of electrodes, a vital part of batteries. Electrodes necessitate materials with efficient electrical conductivity and endurance for repeated charging and discharging cycles. Special steel, such as stainless steel, possesses excellent electrical conductivity and can withstand the demanding conditions within batteries, making it an excellent option for electrode production. Additionally, special steel is integrated into the construction of energy storage system infrastructure. Steel structures are utilized to support large-scale energy storage devices, including pumped hydro storage facilities and compressed air energy storage systems. These structures must possess strength, durability, and resistance to environmental conditions. Special steel provides the necessary properties to ensure the longevity and reliability of these energy storage infrastructure projects. In conclusion, special steel significantly contributes to the energy storage sector by supplying vital components for batteries, such as casings and electrodes. It also plays a crucial role in the construction of energy storage system infrastructure. With its exceptional qualities, special steel enhances the safety, efficiency, and durability of energy storage technologies, thereby facilitating the growth and advancement of the renewable energy sector as a whole.

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