Special Steel SCM420H Steel Bar Structural Steel

Special Steel SCM420H Steel Bar Structural Steel System 1

Special Steel SCM420H Steel Bar Structural Steel

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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

1 Standards and Chemical Composition:

GB	DIN	JIS	BS
20CrMo	25CrMo4	SCM420	25CrMo4

C	Si	Mn	P	S	Cr	Ni	Cu
0.17-0.23	0.15-0.35	0.55-0.90	0.030	0.030	0.85-1.25	0.30	0.30

2 Mechanical Property:

Yield Strength (MPa)	≥685
Tensile Strength (MPa)	≥885
Elongation (%)	≥12
Hardness (HB)	≤197
Reduction in Area (%)	≥50
AKV (J)	≥78

3 Brief Introduction:

Dimension	14-350mm
Length	2-13m or as per your request
Delivery condition	Hot rolled
Heat Treatment	Normalizing, Annealing, Quenching
Packing	Standard seaworthy packing or according to your requirements

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Special Steel SCM420H Steel Bar Structural Steel

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Special Steel SCM420H Steel Bar Structural Steel

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:How does special steel perform in power generation applications?: Special steel is highly regarded in power generation applications due to its exceptional strength, resistance to corrosion, and ability to withstand high temperatures. These qualities make it ideal for the construction of critical components such as turbine blades, steam generators, and boiler tubes. Special steel's superior performance ensures efficient and reliable power generation, contributing to increased productivity and longevity of power plants.

Q:What are the different annealing techniques used for special steel?: There are several annealing techniques used for special steel, including full annealing, process annealing, and stress relief annealing. Full annealing involves heating the steel to a temperature above its critical point and then slowly cooling it, resulting in a refined grain structure and improved mechanical properties. Process annealing is a similar technique used to soften the steel after cold working or hot working processes. Stress relief annealing is used to reduce residual stresses in the steel by heating it to a temperature below its critical point and then gradually cooling it. These different annealing techniques are employed based on the specific requirements of the special steel and the desired outcome.

Q:What are the challenges in machining special steel?: Machining special steel presents several challenges due to its unique properties. Firstly, special steel is known for its high hardness, which makes it difficult to cut and shape without proper tools and techniques. Additionally, special steel often contains alloying elements that increase its strength and resistance to wear, but also make it more prone to work hardening and heat buildup during machining. This requires careful selection of cutting parameters and cooling methods to prevent tool wear and surface damage. Furthermore, the presence of impurities or non-metallic inclusions in special steel can cause tool chipping or premature failure, necessitating the use of specialized tooling and processes. Overall, the challenges in machining special steel lie in its hardness, work hardening tendencies, heat generation, and the need for precision tools and techniques.

Q:How does sulfur affect the machinability of special steel?: Sulfur negatively affects the machinability of special steel by forming brittle sulfide inclusions, reducing the steel's ability to be cut, drilled, or shaped effectively.

Q:How does special steel perform in terms of wear resistance in abrasive environments?: Special steel is renowned for its remarkable ability to resist wear in environments with abrasives. The unique combination of elements and the specific heat treatment methods employed during its production result in a greater level of hardness compared to regular steels. This enhanced hardness grants special steel exceptional resistance to wear caused by abrasive particles or surfaces. In environments where friction and contact with hard materials are prevalent, special steel demonstrates outstanding performance. It can endure the erosive effects of abrasive particles, such as sand, rocks, or metal fragments, without experiencing significant wear or damage. This durability positions special steel as the ideal choice for various applications, including mining equipment, cutting tools, industrial machinery, and automotive components. Furthermore, the wear resistance of special steel extends beyond its surface, permeating throughout its structure. Consequently, even if the steel's surface becomes scratched or abraded, the underlying material remains highly resistant to wear. This characteristic ensures that components made from special steel enjoy an extended lifespan, thereby reducing maintenance costs and downtime. Moreover, special steel retains its wear resistance even when subjected to high temperatures. This property proves particularly advantageous in abrasive environments where the heat generated by friction can accelerate wear. The ability of special steel to maintain its hardness and wear resistance at elevated temperatures guarantees its effectiveness in demanding applications such as high-speed machining or hot forging. Overall, special steel surpasses standard steels when it comes to wear resistance in abrasive environments. Its superior hardness, structural integrity, and temperature resistance make it an excellent choice for applications where durability and longevity are crucial.

Q:What are the different methods for shot peening special steel?: Shot peening is a widely used method for improving the fatigue strength and performance of special steels. There are several different methods for shot peening special steel, each with its own advantages and considerations. 1. Air Shot Peening: This is the most common and traditional method of shot peening. It involves propelling small steel shots at high speeds using compressed air. Air shot peening is effective for treating large surfaces and achieving uniform coverage. It is suitable for most special steels, but may not be suitable for certain delicate or highly sensitive materials. 2. Wheel Shot Peening: In this method, steel shots are propelled using a rotating wheel. Wheel shot peening is particularly effective for treating small or intricate parts, as it offers better control and accuracy. It is commonly used for shot peening gears, shafts, and other components with complex geometries. 3. Wet Shot Peening: This method involves shot peening in a wet environment, usually using a mixture of water and shot media. Wet shot peening offers increased control over shot flow and reduces dust formation. It is often preferred for shot peening special steels that are highly sensitive to heat or have a risk of distortion. 4. Ultrasonic Shot Peening: This advanced method utilizes high-frequency vibrations to propel the shot media onto the steel surface. Ultrasonic shot peening offers enhanced control over shot velocity and impact energy, resulting in improved surface finish and fatigue life. It is particularly useful for shot peening thin or delicate special steels. 5. Laser Shot Peening: This method employs laser pulses to generate shockwaves on the steel surface, causing compressive residual stresses. Laser shot peening is highly precise and can be controlled to treat specific areas or patterns. It is often used for shot peening special steels that require localized treatment or have complex geometries. It is important to note that the selection of the shot peening method depends on various factors, including the type of special steel, component geometry, required surface finish, and desired residual stress profile. Therefore, it is essential to consult with shot peening experts or engineers to determine the most suitable method for shot peening special steel.

Q:What are the applications of special steel in the marine sector?: Special steel is extensively used in the marine sector due to its unique properties. It is used in various applications such as shipbuilding, offshore platforms, and marine equipment manufacturing. Special steel provides excellent corrosion resistance, high strength, and durability, making it ideal for marine environments that are highly corrosive and subject to extreme conditions. It is used for constructing hulls, propeller shafts, pipelines, and various components of ships and offshore structures. Additionally, special steel's ability to withstand impact and fatigue makes it suitable for marine applications where safety and reliability are crucial.

Q:Can special steel be used in the aerospace parts manufacturing industry?: Yes, special steel can be used in the aerospace parts manufacturing industry. Special steel alloys are often chosen for their superior strength, corrosion resistance, and high-temperature performance, making them ideal for aerospace applications where durability and reliability are crucial.

Q:How is special steel used in the production of gears?: Special steel is used in the production of gears due to its high strength and durability. It allows gears to withstand heavy loads, high temperatures, and constant friction. The use of special steel ensures that gears can operate efficiently and reliably in various industrial applications, such as automotive, aerospace, and machinery.

Q:Can special steel be used in the oil refinery industry?: Yes, special steel can be used in the oil refinery industry. Special steels, such as stainless steel and duplex stainless steel, offer superior corrosion resistance and high strength properties, making them suitable for various applications in oil refineries. These steels can withstand harsh operating conditions, including exposure to corrosive chemicals and high temperatures, ensuring the durability and safety of equipment and infrastructure in the oil refinery industry.

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