Grade 4340 (ASTM A29/A29M) Alloy Steel Round Bar
- Ref Price:
-
- Loading Port:
- Shanghai
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 3 m.t
- Supply Capability:
- 10000 m.t/month
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Specification
Specifications of Round Bar
1. Alloy steel round bar
2. Dia:16mm~250mm
3. Length: 6m, 9m, 12m or as customer’s request
4. Tolerance: Within ±5% for weight; ±2mm for diameter
5. Note: The price can be better is the quantity is good
Equivement Grade
DIN:34CRNIMO
SAE:4340
JIS:SNCM439(SNCM8)
BS:817M40
UNI:40NiCrMo7
Chemical Composition
| C | Si | Mn | S | P | Cr | Ni | Cu | Mo |
| 0.37-0.44 | 0.17-0.37 | 0.50-0.80 | ≤0.025 | ≤0.025 | 0.60-0.90 | 1.25-1.65 | ≤0.025 | 0.15-0.25 |
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Usage and Applications of Round Bar
1. Chinese standard steel bar is often used where large amounts of steel need to be formed, for example as structural steel.
2. And we can use this kind of product on the performance of the mechanical parts if the demand is not very high.
3. Steel round bar is used in construction and a large number of architectural and engineering structures.
Packaging & Delivery of Round Bar
Packaging Detail: All goods are packed in bundle with steel strips and shipped by break bulk vessel or container (depend on target market and different ports)
Delivery Detail: 15~45 days
Trade terms: FOB, CFR, CIF
MOQ: 30 metric tons per specification; we can negotiate the quantity if the specification is normal or we have stock of one specification.
Weight: Theprice invoicing on theoretical weight basis or actual weight basis depends on customer’s request.
Shipment: The shipment of bulk break or container is depends on customer’s request and the situation of the port of destination.
Documents given: Full set of original clean on board bill of lading; Original signed commercial invoice; Original packing list; Policy of insurance; Certificate of origin and what the target market needs.
Production Flow of Round Bar
1. The common processes are preheated forging quenching, dual refinement solution process, cooling quenching and isothermal quenching. We use heat treatment for dual refinement solution process.
2. Material prepare (billet) — heat up — rough rolling — precision rolling — cooling — packing — storage and transportation
FAQ:
Q1: Why buy Materials & Equipment from OKorder.com?
A1: All products offered byOKorder.com are carefully selected from China's most reliable manufacturing enterprises. Through its ISO certifications, OKorder.com adheres to the highest standards and a commitment to supply chain safety and customer satisfaction.
Q2: How do we guarantee the quality of our products?
A2: We have established an advanced quality management system which conducts strict quality tests at every step, from raw materials to the final product. At the same time, we provide extensive follow-up service assurances as required.
Q3: How soon can we receive the product after purchase?
A3: Within three days of placing an order, we will begin production. The specific shipping date is dependent upon international and government factors, but is typically 7 to 10 workdays.
Q4: What makes stainless steel stainless?
A4: Stainless steel must contain at least 10.5 % chromium. It is this element that reacts with the oxygen in the air to form a complex chrome-oxide surface layer that is invisible but strong enough to prevent further oxygen from "staining" (rusting) the surface. Higher levels of chromium and the addition of other alloying elements such as nickel and molybdenum enhance this surface layer and improve the corrosion resistance of the stainless material.
Q5: Can stainless steel rust?
A5: Stainless does not "rust" as you think of regular steel rusting with a red oxide on the surface that flakes off. If you see red rust it is probably due to some iron particles that have contaminated the surface of the stainless steel and it is these iron particles that are rusting. Look at the source of the rusting and see if you can remove it from the surface.
- Q: What are the main factors affecting the tensile strength of special steel?
- The main factors affecting the tensile strength of special steel include the composition of the alloy, the heat treatment processes used, the presence of impurities or defects, the grain size and structure, and the amount of cold work or strain hardening applied to the material. Additionally, factors such as the presence of residual stresses, the temperature at which the steel is tested, and the rate of loading can also influence the tensile strength of special steel.
- Q: How is high-temperature tool steel used in the production of hot work tools?
- High-temperature tool steel is used in the production of hot work tools due to its exceptional heat resistance and strength properties. It can withstand the high temperatures generated during hot work processes such as forging, extrusion, and die casting, without losing its hardness or experiencing deformation. This steel is used to manufacture tooling components like dies, punches, and inserts, ensuring their longevity and performance in extreme heat conditions.
- Q: What are the properties of wear-resistant tool steel?
- Wear-resistant tool steel is characterized by its high hardness, strength, and resistance to abrasion and wear. It has a high carbon content, typically ranging from 0.7% to 1.5%, which contributes to its hardness and wear resistance. This type of steel is also known for its ability to retain its hardness even at high temperatures, making it suitable for applications that involve friction and heat. Additionally, wear-resistant tool steel usually exhibits good toughness and machinability, allowing it to withstand heavy usage and be easily shaped into various tool forms.
- Q: How does special steel contribute to the defense aerospace industry?
- The defense aerospace industry relies heavily on special steel to provide the necessary strength, durability, and resistance to extreme conditions. This steel is essential for designing and producing military aircraft and defense systems. Special steel has a key role in withstanding high temperatures and pressures. It is ideal for constructing engine components like turbine blades, exhaust systems, and combustion chambers. These parts endure intense heat and stress during operation, but special steel ensures they can handle these extreme conditions without compromising performance or safety. Additionally, special steel is used in manufacturing structural components for military aircraft, such as landing gear, wings, and fuselage sections. These components must possess exceptional strength and toughness to withstand the harsh conditions of flight and combat operations. Special steel provides the necessary mechanical properties to endure the forces and impacts they may encounter. Special steel also contributes to the defense aerospace industry through its corrosion resistance. Military aircraft often face harsh environments like saltwater and corrosive chemicals. By incorporating corrosion-resistant alloys, special steel helps protect critical parts from corrosion, ensuring the aircraft's longevity and reliability. Furthermore, special steel's high strength-to-weight ratio allows for the production of lightweight yet robust components in defense aerospace applications. This characteristic is highly desired in the aerospace industry as it enables the design of fuel-efficient, faster aircraft capable of carrying higher payloads. By reducing weight, special steel enhances the overall performance and efficiency of military aircraft. In conclusion, special steel is an essential material in the defense aerospace industry. Its unique properties, including high temperature resistance, strength, corrosion resistance, and lightweight characteristics, make it indispensable for producing reliable, high-performance military aircraft and defense systems. Special steel plays a crucial role in ensuring the safety, efficiency, and effectiveness of the defense aerospace industry.
- Q: What are the main characteristics of creep-resistant steel forgings?
- Creep-resistant steel forgings possess a range of essential qualities that render them suitable for applications involving high temperatures and prolonged stress and heat exposure. To begin with, these forgings are renowned for their exceptional resistance to creep deformation. Creep refers to the gradual deformation that occurs under constant load and elevated temperatures over an extended period. These forgings are specifically designed to withstand such deformation, retaining their shape and structural integrity. Consequently, they are ideal for use in environments with high temperatures, such as turbine blades, boiler components, and other similar settings. Another crucial characteristic of creep-resistant steel forgings is their impressive strength. These forgings are manufactured using alloying elements like chromium, molybdenum, and vanadium, which enhance their tensile strength. As a result, they exhibit excellent resistance to deformation and fracture under high-stress conditions. This strength is essential for ensuring that the forgings can endure the demands of various applications and perform reliably over time. Furthermore, creep-resistant steel forgings demonstrate good resistance to oxidation and corrosion. The presence of alloying elements creates a protective layer on the surface, safeguarding against oxidation and corrosion at elevated temperatures. This resistance is vital in preventing the degradation of the material and maintaining its mechanical properties, even in harsh environments. Moreover, creep-resistant steel forgings offer outstanding thermal stability. They can endure extreme temperature fluctuations without significant dimensional changes or loss of mechanical strength. This stability is particularly critical in applications that involve rapid heating and cooling cycles, ensuring that the forgings can sustain their performance under challenging conditions. Additionally, creep-resistant steel forgings possess excellent fatigue resistance. Fatigue refers to the weakening of a material resulting from cyclic loading, which is particularly relevant in high-temperature applications due to the combination of stress and heat. These forgings are designed to withstand cyclic loading and retain their mechanical properties, thus reducing the risk of fatigue failure and enhancing the overall reliability of the component. In conclusion, the primary characteristics of creep-resistant steel forgings encompass resistance to creep deformation, high strength, good oxidation and corrosion resistance, thermal stability, and excellent fatigue resistance. These qualities establish creep-resistant steel forgings as a reliable and durable choice for applications requiring resistance to high temperatures, stress, and prolonged exposure to challenging environments.
- Q: How does special steel perform in terms of fatigue resistance?
- Special steel has excellent fatigue resistance due to its unique composition and manufacturing process. It is specifically designed to withstand repeated loading and stress, making it highly resistant to fatigue failure. This property ensures that special steel can endure prolonged use and maintain its structural integrity, even under demanding conditions.
- Q: How do alloying elements affect the properties of special steel?
- Alloying elements play a crucial role in determining the properties of special steel. By adding specific elements to the steel composition, various desirable characteristics can be achieved. Firstly, alloying elements can improve the strength and hardness of the steel. For example, elements like chromium, nickel, and molybdenum enhance the steel's resistance to deformation and improve its overall toughness. This is particularly important in applications where the steel needs to withstand high temperatures, pressure, or mechanical stress. Moreover, alloying elements can enhance the corrosion resistance of special steel. Elements such as chromium, nickel, and copper create a protective oxide layer on the surface of the steel, which prevents it from rusting or corroding. This is particularly important in industries such as marine, oil and gas, and chemical processing, where exposure to corrosive environments is common. Additionally, alloying elements can influence the steel's ability to be welded, machined, or heat treated. For instance, elements like manganese and silicon improve the weldability of steel, making it easier to join different components together. On the other hand, elements like vanadium and tungsten increase the steel's ability to retain its hardness even after being subjected to high temperatures, making it suitable for applications involving heat treatment. Furthermore, alloying elements can impact the steel's electrical and magnetic properties. Elements like nickel and cobalt can enhance the steel's magnetic properties, making it suitable for applications in electrical transformers or magnetic devices. Conversely, elements like aluminum and titanium can improve the steel's electrical conductivity, making it ideal for electrical wiring or conductive components. In summary, alloying elements have a significant impact on the properties of special steel. They can enhance its strength, hardness, corrosion resistance, weldability, heat treatability, electrical conductivity, and magnetic properties. By carefully selecting and controlling the alloying elements, manufacturers can tailor the steel's properties to meet the specific requirements of various industries and applications.
- Q: What is the tensile strength of special steel?
- The tensile strength of special steel can vary depending on the specific alloy and manufacturing process, but it is generally much higher than that of regular steel.
- Q: How is the hardness of special steel measured?
- Various methods are typically used to measure the hardness of special steel. The most common method is the Rockwell hardness test, which involves pressing a diamond or hardened steel ball into the surface of the steel to measure the depth of penetration. The Rockwell hardness number is determined based on the difference in depth before and after the application of a minor load and a major load. Another widely used method is the Brinell hardness test, which involves indenting a hardened steel or carbide ball into the steel surface and measuring the diameter of the indentation. The hardness is calculated based on the applied load and the diameter of the impression. Additionally, for specific applications, other methods like the Vickers hardness test and the Knoop hardness test are often employed. These tests require indenting the steel surface with a diamond pyramid to measure the diagonal lengths or the indentation depth, respectively. Ultimately, the hardness of special steel is determined by assessing its resistance to indentation or penetration. This information is valuable in understanding the mechanical properties of the steel and determining its suitability for different applications.
- Q: What is special steel? What is special steel?
- Special steel is the abbreviation of special steel, which is the most important factor in the steel industry of most industries in the national economy, such as machinery, automobile, military industry, chemical industry, household electrical appliance, shipping, traffic, railway and new industries.
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Grade 4340 (ASTM A29/A29M) Alloy Steel Round Bar
- Ref Price:
-
- Loading Port:
- Shanghai
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 3 m.t
- Supply Capability:
- 10000 m.t/month
OKorder Service Pledge
OKorder Financial Service
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