Grade 40Mn CNBM Hot Rolled Alloy Steel Round Bar

Grade 40Mn CNBM Hot Rolled Alloy Steel Round Bar

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Loading Port:: Shanghai

Payment Terms:: TT OR LC

Min Order Qty:: 20 m.t.

Supply Capability:: 10000 m.t./month

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Specification

Type:

Spring Steel

Shape:

Steel Round Bar

Specifications:

1. Commodity: Round steel bar

2. Technical: Hot rolling

3. Length: Min. 5.8meter, according to requirement.

4.Diameter: 16mm-250mm

Material	40Mn	Round bar	Dia(mm)	16-600
Process	EAF + LF + VD + Forged + Heat Treatment (optional)	Round bar	Length (mm)	Max 12000
Heat treatment	Normalized / Annealed / Quenched / tempered	Flat bar	Thickness(mm)	8-500
Delivery condition	Hot forged +Rough machined (black surface after Q/T)+ Turned (optional)		Width(mm)	70-200
Test	Ultrasonic test according to SEP 1921-84 D/d		Length (mm)	Max 12000

Chemical Composition:

C	Si	Mn	Cr	Ni	Cu
0.5~0.8	0.17~0.37	0.25~1.2	≤0.25	≤0.30	≤0.25

Usage and Applications:

Gear, Sleevesspool,Shaft, Crankshaft, Pin

Packaging & Delivery:

Packaging Detail: Standard seaworthy packing or as customer required; all goods are packed in bundle with steel strips and shipped by break bulk vessel or container

Delivery Detail: 15~45 days

Production Flow:

EAF+LF+VD+ Forged+ Heat Treatment

Material prepare (billet) — heat up — rough rolling — precision rolling — cooling — packing — storage and transportation

Grade 40Mn CNBM Hot Rolled Alloy Steel Round Bar

Quality Assurance:

1. We will strictly inspect our production that we sold according to the customer’s request.

2. Our steel reaches international quality standards.

3. Quality should be in conformity with the specification of the manufacturer. Quantity and packing conditions should be in conformity with the term in the contract.

4. Should the packing found damaged, the buyer has the right to claim to the seller

Q: What are the different surface modification techniques used for special steel?: Some of the different surface modification techniques used for special steel include heat treatment, electroplating, coatings, and nitriding. These techniques are utilized to enhance the steel's hardness, corrosion resistance, wear resistance, and overall performance in various applications.

Q: How is special steel used in the production of heat exchangers?: Special steel is widely used in the production of heat exchangers due to its unique properties that make it ideal for this application. Heat exchangers are devices designed to transfer heat from one medium to another, and special steel offers several advantages in this process. Firstly, special steel has excellent thermal conductivity, meaning it can efficiently transfer heat from one fluid to another. This property is crucial for heat exchangers, as it allows for the rapid and efficient exchange of thermal energy. Additionally, the high corrosion resistance of special steel makes it highly suitable for heat exchanger applications. Heat exchangers often come into contact with corrosive fluids or gases, and regular steel may corrode over time. However, special steel is specifically designed to resist corrosion, ensuring the longevity and reliability of the heat exchanger. Furthermore, special steel offers exceptional strength and durability, allowing heat exchangers to withstand high pressures and temperatures. Heat exchangers often operate in challenging environments, and special steel can withstand these harsh conditions without compromising its structural integrity. Special steel also provides excellent weldability and formability, making it easier to manufacture complex heat exchanger designs. Its versatility allows for the production of heat exchangers in various shapes and sizes, catering to the specific needs of different industries. In summary, special steel is used in the production of heat exchangers due to its high thermal conductivity, corrosion resistance, strength, durability, weldability, and formability. These properties ensure efficient heat transfer, resistance to corrosion, and the ability to withstand harsh operating conditions, making special steel an ideal material for heat exchanger applications.

Q: How does special steel contribute to the impact resistance of products?: Special steel, also known as high-strength or high-performance steel, plays a crucial role in enhancing the impact resistance of various products. This type of steel is specifically designed to possess exceptional strength, toughness, and durability, making it highly resistant to deformation and fracture under high-stress conditions. One of the key factors that contribute to the impact resistance of special steel is its composition. Special steel often contains alloying elements such as manganese, chromium, nickel, molybdenum, and vanadium, which are incorporated to enhance its mechanical properties. These alloying elements provide the steel with increased hardness, tensile strength, and resistance to wear, corrosion, and fatigue. As a result, products made from special steel are capable of withstanding heavy impact loads without deforming or breaking. Furthermore, the microstructure of special steel plays a vital role in its impact resistance. Through advanced manufacturing techniques, the steel's microstructure can be fine-tuned to achieve a desirable combination of strength and toughness. Special heat treatment processes, such as quenching and tempering, can further refine the microstructure, resulting in a material that can absorb and dissipate energy more effectively. This makes special steel highly resistant to cracks and fractures, even when subjected to sudden and severe impacts. In addition to its intrinsic properties, special steel is often used in the form of engineered components or structures that are specifically designed for impact resistance. For example, in the automotive industry, special steel is utilized for manufacturing components like crash beams, bumpers, and roll cages. These components are designed to absorb and distribute impact energy, protecting the vehicle and its occupants during accidents. Overall, special steel significantly contributes to the impact resistance of products by providing superior strength, toughness, and durability. Its unique composition, microstructure, and design enable it to withstand high-stress conditions and absorb impact energy effectively. As a result, products made from special steel offer enhanced safety and reliability, making them suitable for a wide range of applications in industries such as automotive, aerospace, construction, and defense.

Q: What are the main manufacturing processes for special steel?: The main manufacturing processes for special steel include electric arc furnace (EAF) melting, vacuum degassing, continuous casting, hot rolling, heat treatment, and finishing operations such as machining and surface treatment. These processes ensure the production of high-quality specialized steel with desired properties and performance characteristics.

Q: What are the different surface finishing techniques used for special steel?: Some of the different surface finishing techniques used for special steel include electroplating, hot-dip galvanizing, powder coating, and passivation.

Q: Can special steel be used in the medical device manufacturing industry?: Yes, special steel can be used in the medical device manufacturing industry. Special steel alloys, such as stainless steel or titanium, are commonly used in medical device manufacturing due to their excellent corrosion resistance, biocompatibility, and strength characteristics. These alloys are specifically designed to meet the stringent requirements and regulations of the medical industry, making them ideal for producing safe and durable medical devices.

Q: How is mold steel used in injection molding?: Mold steel is used in injection molding to create the molds or tooling that are used to produce plastic parts. The steel is used to form the cavity or core of the mold, which determines the shape of the final product. Mold steel is chosen for its high strength, durability, and heat resistance to withstand the high pressures and temperatures involved in the injection molding process.

Q: How is special steel used in the production of molds and dies?: Special steel is used in the production of molds and dies due to its exceptional properties, such as high hardness, wear resistance, and heat resistance. These characteristics make it ideal for shaping and forming various materials, including metals and plastics. Special steel can withstand the high pressures and temperatures involved in the molding and die casting processes, ensuring durability and precision in the production of molds and dies.

Q: Can special steel be used in the semiconductor manufacturing industry?: Yes, special steel can be used in the semiconductor manufacturing industry. Special steel alloys with high levels of purity and specific properties, such as high thermal conductivity and resistance to corrosion, can be utilized in various applications within semiconductor manufacturing, including the fabrication of specialized tools, equipment, and components.

Q: What are the main factors that affect the machinability of special steel?: Several factors can influence the machinability of special steel. The composition of the steel itself is one of the main factors. Special steels often contain complex alloys that enhance their properties, such as strength or corrosion resistance. However, these alloying elements can also have a negative impact on machinability. Chromium, nickel, and molybdenum, for example, can make the steel harder to machine due to their hardening or abrasive properties. The microstructure of the steel is another factor that affects machinability. Special steels can undergo heat treatments to achieve desired properties, but these treatments can also alter the microstructure of the material. The presence of carbides or precipitates can make the steel harder and more brittle, leading to increased tool wear and poorer machinability. The hardness of the steel is also important. Harder steels generally have lower machinability as they are more resistant to cutting forces. High-speed steels are often used to counteract this issue. However, excessively hard steels may require specialized tooling or machining techniques to achieve satisfactory results. Impurities or non-metallic inclusions in the steel can disrupt the cutting process and reduce tool life and surface finish. Special steel manufacturers strive to minimize impurities and control inclusion content to improve machinability. Lastly, cutting parameters and machining conditions play a significant role in determining machinability. Factors such as cutting speed, feed rate, and depth of cut must be optimized to achieve the best balance between material removal rate and tool life. Coolant usage and chip evacuation are also crucial considerations to prevent excessive heat buildup and chip recutting, which can negatively impact machinability. In conclusion, the machinability of special steel is affected by factors such as composition, microstructure, hardness, impurities, and cutting parameters. Understanding these factors and employing appropriate machining techniques can help maximize productivity and produce high-quality components from special steels.

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