Special Steel Hot Rolled SCM440 Material Round Bar

Special Steel Hot Rolled SCM440 Material Round Bar System 1

Special Steel Hot Rolled SCM440 Material 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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Chemical Element for JIS SCM440 round alloy steel bar

Standard	Grade Number
GB	42CrMo	C	Si	Mn	P	S	Cr	Ni	Mo	Cu
ASTM	4140	0.36-0.44	0.10-0.40	0.65-1.10	≤0.04	≤0.04	0.75-1.20	-	0.15-0.35	≤0.030
DIN	42CrMo4 1.7225	0.35-0.44	0.15-0.30	0.70-0.90	≤0.035	≤0.04	0.80-1.10	-	0.15-0.25	≤0.025
JIS	SCM440	0.38-0.42	0.15-0.35	0.60-0.85	≤0.03	≤0.03	0.9-1.20	≤0.25	0.15-0.30	≤0.30

Physical Properties for JIS SCM440 round alloy steel bar

Physical Properties
Tensile Strength (MPa)		≥1080(110)
Yield strength(MPa)		≥930(95)
Elongation(%)		≥12
Reduction of area(%)		≥45
Akv (J)		≥63
Impact roughness(J/cm2)		≥78(8)
Hardness		≤217HB
Specimen size		25mm

Surface Treatment: painting,plating,polishing,black oxide,transparent anti-rust oil

Heat treatment: Normalized / Annealed / Quenched / tempered

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Special Steel Hot Rolled SCM440 Material 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

Main Product

Plastic Mould Steel

DIN 1.2311,1.2738,1.2083,1.2316 etc.

AISI P20,P20+Ni,420 etc.

JIS SUS420J2

Hot Work Steel

DIN 1.2344,1.2343,1.2367,1.2365,1.2581,1.2713 etc.

AISI H13,H11,H10,H21, etc.

JIS SKD61,SKD6,SKD5,SKT4 etc.

Cold Work Steel

DIN 1.2739, 1.2601, 1.2080, 1.2436, 1.2631, 1.263, 1.2510, 1.2327 etc.

AISI D2, D5, D3, D6, A8, A2, O1 etc.

JIS SKD10, SKD11, SKD1, SKS3 etc.

High Speed Steel

DIN 1.3343, 1.3243, 1.3247, 1.3355 etc.

AISI M2, M35, M42, T1 etc.

JIS SKH51, SKH35, SKH59, SKH2 etc.

Alloy Structural Steel

DIN 1.7035,1.6511,1.7220,1.7225 etc.

AISI 5140, 4340, 4135, 4140 etc.

JIS SCr440,SNCM439,SCM435,SCM440 etc.

Stainless & Carbon Steel or Others

DIN 1.4125,1.1191 etc

AISI 440C,1045, 1020 etc.

JIS SUS440C,S45C etc

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: Is special steel resistant to wear and abrasion?: Yes, special steel is known for its high resistance to wear and abrasion. Special steel is often manufactured with specific alloying elements and heat treatment processes that enhance its hardness and toughness. These properties make it highly resistant to the detrimental effects of wear and abrasion, making it suitable for applications that require durability and longevity. Special steels are commonly used in industries such as automotive, aerospace, construction, and manufacturing, where components are subjected to harsh environments or repetitive mechanical actions that can cause wear and abrasion.

Q: What are the different techniques used for joining special steel?: There are several techniques used for joining special steel, including welding, brazing, soldering, and adhesive bonding. Welding is the most common method, which involves melting the base material and adding a filler material to create a strong bond. Brazing uses a filler metal with a lower melting point than the base material, while soldering uses a lower melting point filler metal. Adhesive bonding involves using a special adhesive to bond the steel parts together. Each technique has its advantages and limitations, and the choice depends on the specific requirements of the application.

Q: Can special steel be used in medical applications?: Indeed, medical applications can utilize special steel. Known as stainless steel, special steel is extensively employed in the medical field due to its distinctive qualities and benefits. Its resistance to corrosion is exceptionally high, a crucial aspect in medical settings where exposure to bodily fluids and sterilization procedures is prevalent. Moreover, special steel is biocompatible, meaning it does not trigger adverse reactions upon contact with human tissues or fluids. Consequently, it finds suitability in numerous applications, including surgical instruments, orthopedic implants, dental equipment, and medical devices. The adaptability of special steel allows it to be molded into various forms, ensuring its utilization for diverse medical purposes. Furthermore, its strength and durability contribute significantly to its effectiveness in medical applications, providing dependable and long-lasting tools and equipment. Additionally, special steel can endure high temperatures, making it appropriate for autoclaving and other sterilization methods. In conclusion, the properties of special steel make it an exceptionally fitting material for medical applications, guaranteeing the safety, efficacy, and endurance of medical equipment and devices.

Q: How is special steel used in the manufacturing of cutting tools?: Special steel is used in the manufacturing of cutting tools due to its exceptional properties such as high hardness, wear resistance, and toughness. This type of steel allows for the production of durable and efficient cutting tools that can withstand the high forces and temperatures involved in cutting operations. Additionally, special steel can be heat-treated to further enhance its properties, making it ideal for creating sharp and long-lasting cutting edges.

Q: What are the common challenges in heat treating titanium alloys?: Heat treating titanium alloys can present several common challenges. One of the main challenges is the high reactivity of titanium with oxygen, nitrogen, and hydrogen at elevated temperatures. This reactivity can lead to surface contamination and the formation of undesirable oxides, nitrides, or hydrides, which can affect the mechanical properties of the alloy. Another challenge is the formation of alpha-case, a thick layer of alpha-phase titanium on the surface of the alloy during heat treatment. Alpha-case is brittle and can significantly reduce the fatigue strength and ductility of the material. Therefore, minimizing or eliminating the formation of alpha-case is crucial in heat treating titanium alloys. Furthermore, titanium alloys have a narrow temperature range for effective heat treatment. If the temperature is too low, it may not achieve the desired microstructure and mechanical properties. On the other hand, if the temperature is too high, it can lead to grain growth, which can reduce the strength and toughness of the alloy. Additionally, the heat treatment of titanium alloys often requires precise control of the heating and cooling rates to achieve the desired microstructure and properties. Rapid or uneven cooling can result in non-uniform microstructures, residual stresses, or distortion of the part. Finally, the cost of heat treating titanium alloys can be a challenge. Titanium alloys have a high affinity for oxygen, which necessitates the use of specialized equipment, such as vacuum furnaces or controlled atmosphere furnaces, to maintain a low oxygen environment. These specialized heat treatment processes can be expensive and require careful handling and maintenance to ensure the desired results. In conclusion, the common challenges in heat treating titanium alloys include managing reactivity with oxygen, nitrogen, and hydrogen, minimizing alpha-case formation, achieving the correct temperature range, controlling heating and cooling rates, and dealing with the cost of specialized equipment and processes. Overcoming these challenges is essential to obtain high-quality titanium alloy components with desired properties.

Q: How does special steel contribute to improving product reliability in critical applications?: Special steel plays a crucial role in enhancing product reliability in critical applications due to its unique properties. Its exceptional strength, durability, and resistance to corrosion, heat, and wear enable it to withstand extreme conditions and stresses. This reliability ensures that critical applications, such as aerospace, automotive, and medical equipment, operate efficiently and safely. Additionally, special steel's high precision manufacturing capabilities allow for the production of complex components, further enhancing the performance and reliability of the final product.

Q: How does surface treatment affect the performance of special steel?: Surface treatment plays a crucial role in enhancing the performance of special steel. The primary purpose of surface treatment is to alter the surface properties of the steel to meet specific requirements and improve its performance in various applications. One significant effect of surface treatment on special steel is increased corrosion resistance. By applying coatings or treatments such as galvanization, electroplating, or passivation, the steel's surface becomes more resistant to the damaging effects of moisture, chemicals, and other corrosive agents. This is particularly important in industries like construction, automotive, or marine, where steel is exposed to harsh environments. Surface treatment also affects the wear resistance of special steel. Through processes like carburizing, nitriding, or boriding, a thin layer of hard and wear-resistant material is formed on the steel's surface. This significantly improves its ability to withstand friction, abrasion, and mechanical stress, making it suitable for applications involving heavy machinery, cutting tools, or bearings. Furthermore, surface treatment can enhance the aesthetic appeal of special steel. Techniques like polishing, grinding, or coating can improve the steel's appearance, making it more visually appealing for architectural or decorative purposes. Another important aspect affected by surface treatment is the steel's adhesion properties. By modifying the surface through processes such as shot peening or surface etching, the steel becomes more receptive to adhesives, paints, or coatings. This improves the bond strength between the steel and other materials, making it suitable for applications where adhesion is critical, such as in aerospace or electronics industries. In summary, surface treatment significantly impacts the performance of special steel. It enhances corrosion resistance, wear resistance, adhesion properties, and aesthetic appeal. By selecting the appropriate surface treatment techniques, manufacturers can tailor the steel's surface properties to meet specific application requirements, thereby maximizing its performance and extending its lifespan.

Q: What are the challenges in machining special steel with high hardness?: One of the main challenges in machining special steel with high hardness is the increased tool wear. Due to the hardness of the steel, the cutting tools used in the machining process wear out more quickly, leading to shorter tool life and increased tool replacement costs. Additionally, the high hardness of the steel makes it more difficult to achieve accurate and precise machining, as it requires higher cutting forces and can cause issues such as tool chipping or breakage. Specialized machining techniques and tools are often required to overcome these challenges and ensure successful machining of high hardness steel.

Q: How does special steel contribute to the electrical conductivity of products?: Several methods can be employed to utilize special steel in enhancing the electrical conductivity of products. Firstly, the formulation of special steel alloys can be tailored with specific chemical compositions that enhance its electrical conductivity. For instance, the addition of elements like copper, silver, or nickel to the steel creates additional pathways for the flow of electric current, thus increasing the conductivity. Moreover, manipulating the microstructure of special steel can also contribute to improved electrical conductivity. By controlling the size and orientation of the steel's grains, the resistance to the flow of electrons can be reduced, consequently enhancing the overall conductivity of the material. Furthermore, subjecting special steel to heat treatment or other processes can further enhance its electrical conductivity. Techniques such as annealing or tempering can effectively eliminate impurities and enhance the crystal structure of the steel, resulting in improved conductivity. In addition to these methods, special steel can also be designed with low magnetic permeability, reducing its resistance to the flow of magnetic fields. This characteristic proves advantageous in applications where minimizing electromagnetic interference is crucial, such as in electrical connectors or transformers. To summarize, special steel contributes to the electrical conductivity of products through various means, including its chemical composition, microstructural control, heat treatment, and low magnetic permeability. By optimizing these factors, special steel can significantly enhance the performance of electrical components and systems.

Q: What are the different methods for joining special steel?: There are several methods available for joining special steel, which is typically used in applications that require high strength, corrosion resistance, or specific mechanical properties. Some of the most common methods for joining special steel include: 1. Welding: This is the most common method used to join special steel. Different types of welding techniques can be employed, such as arc welding (including shielded metal arc welding, gas metal arc welding, and flux-cored arc welding), resistance welding (spot welding, seam welding), and laser welding. Welding requires the use of filler material to bond the steel pieces together, and it can produce strong and durable joints. 2. Brazing: Brazing involves joining special steel using a filler material (typically a brass or bronze alloy) with a lower melting point than the base steel. The filler material is heated until it melts and flows into the joint, creating a strong bond. Brazing is often used for joining dissimilar metals or when the base steel has a high melting point. 3. Soldering: Similar to brazing, soldering also involves using a filler material with a lower melting point to join special steel. However, soldering typically uses a non-ferrous filler material, such as tin-lead or tin-silver alloys. Soldering is commonly used for joining electronic components or delicate parts that cannot withstand high temperatures. 4. Mechanical Fastening: Special steel can also be joined using mechanical fasteners, such as bolts, screws, rivets, or clips. This method is often used when the joint needs to be easily disassembled, or when welding or brazing is not feasible or desirable. 5. Adhesive Bonding: Adhesive bonding involves using a specialized adhesive or glue to join special steel. This method is suitable for joining thin or delicate steel components or when the joint requires high resistance to vibration or shock. Adhesive bonding can provide a strong and durable bond, but it may not be suitable for high-temperature or high-stress applications. It is important to consider the specific requirements of the application, such as strength, corrosion resistance, temperature resistance, and the desired permanence of the joint, when selecting the appropriate method for joining special steel. Each method has its own advantages and limitations, and choosing the right method will ensure a strong and reliable joint.

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