ASTM 5140 Alloy Steel Round Bar System 1

ASTM 5140 Alloy Steel Round Bar System 2

ASTM 5140 Alloy Steel Round Bar System 3

ASTM 5140 Alloy Steel Round Bar System 4

ASTM 5140 Alloy 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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Chemical Composition	Mechanical Properties (In Quenched & Tempered State)
C	0.37-0.44 %	Tensile strength(MPA)	≥980(100)
Si	0.17-0.37 %	Yield strength (MPA)	≥785(80)
Mn	0.50-0.80 %	Elongation (δ5/%)	≥9
Cr	0.80-1.10 %	Reduction in Area (ψ/%)	≥45
Ni	≤0.30 %	Impact (J)	≥ 47
P	≤0.035 %	Impact toughness value αkv (J/cm2)	≥59(6)
S	≤0.035 %	Hardness	≤207HB
Cu	≤0.030 %

Product Name	Typical Grades	Diameter(mm)	Standard adopted
Carbon Steel	20 (1020/S20C/C22)	Ø16-Ø300	GB/SAE/JIS/DIN
40 (1040/S40C/C40)
45 (1045/S45C/C45)
Bearing Steel	GCr9 (51100/SUJ1)	Ø12-Ø250
GCr15 (52100/SUJ2/100Gr6)
GCr9SiMn (A485-Gr.1/SUJ3)
Cr-Mo Steel	20Cr (5120/SCr420H/20Cr4)	Ø12-Ø250
40Cr (5140/SCr440/41Cr4)
42CrMo(4140/SCM440/42CrMo4)
Gear Steel	20CrNiMo	Ø16-Ø600
20CrMn(5115/SMnC420/20MnCr5)
20CrNiMo(8620/SNCM220/20CrMiMo2)

Carbon Steel	Mold bottom, Plastic mold, Construction machinery parts Automobile parts, Security grills, Screens, Construction
Bearing Steel	Aerospace, Navigation, Nuclear energy, Chemical industry Electronic information, Petrochemical, Instrument and meter Transportation
Cr-Mo Steel	Mechanism & Fasteners gear, Stressed components for vehicles Engines and machines, Parts of larger cross-section
Gear Steel	All kinds of gears, Statically and dynamically stressed component for vehicles Engines and machine, Larger cross-section parts, Crankshafts

Company Information

CNBM International Corporation is the most important trading platform of CNBM group.

Whith its advantages, CNBM International are mainly concentrate on Cement, Glass, Iron and Steel, Ceramics industries and devotes herself for supplying high qulity series of refractories as well as technical consultancies and logistics solutions.

FAQ

1, Your advantages?

professional products inquiry, products knowledge train (for agents), smooth goods delivery, excellent customer solution proposale

2, Test & Certificate?

SGS test is available, customer inspection before shipping is welcome, third party inspection is no problem

3, Factory or Trading Company?

CNBM is a trading company but we have so many protocol factories and CNBM works as a trading department of these factories. Also CNBM is the holding company of many factories.

4, Payment Terms?

30% TT as deposit and 70% before delivery.

Irrevocable L/C at sight.

5, Trading Terms?

EXW, FOB, CIF, FFR, CNF

6, After-sale Service?

CNBM provides the services and support you need for every step of our cooperation. We're the business partner you can trust.

For any problem, please kindly contact us at any your convenient time.

We'll reply you in our first priority within 24 hours.

Packaging & Delivery

1, Packaging: seaworthy package or as required

2, Delivery: 35-45 days or based on quantity

Q:How do steel round bars compare to wrought iron bars?: Steel round bars and wrought iron bars have several differences that set them apart. Firstly, steel round bars are made from an alloy of iron and carbon, whereas wrought iron bars are composed of pure iron with a low carbon content. This difference in composition leads to varying properties. Steel round bars are known for their strength and durability, making them suitable for a wide range of applications, including construction, manufacturing, and engineering. On the other hand, wrought iron bars are softer and more malleable, allowing them to be easily shaped and formed into intricate designs. This characteristic makes wrought iron bars popular in decorative applications such as gates, fences, and ornamental pieces. Another difference lies in their manufacturing processes. Steel round bars are typically produced through hot rolling, which involves heating the steel billet and passing it through a series of rollers to shape it into the desired round bar form. In contrast, wrought iron bars are made through a labor-intensive process called blacksmithing. This involves heating the iron and repeatedly hammering it to remove impurities and create a fibrous structure, resulting in its characteristic grainy appearance. In terms of cost, steel round bars are generally more affordable compared to wrought iron bars. The manufacturing process for steel is more streamlined and efficient, leading to lower production costs. Wrought iron bars, on the other hand, require more time and labor, making them more expensive. Finally, when it comes to corrosion resistance, steel round bars have an advantage. Steel can be further alloyed with elements such as chromium, nickel, and molybdenum to enhance its resistance to rust and corrosion. This makes steel round bars suitable for outdoor applications where they may be exposed to moisture and harsh environmental conditions. Wrought iron bars, although they possess some level of corrosion resistance, are more prone to rusting and require regular maintenance to prevent deterioration. In conclusion, steel round bars and wrought iron bars differ in terms of composition, strength, manufacturing process, cost, and corrosion resistance. The choice between the two will depend on the specific requirements of the application, with steel round bars being favored for their strength and affordability, while wrought iron bars are often chosen for their malleability and decorative appeal.

Q:What are the different types of steel round bar surface finishes?: Steel round bars can be treated with various surface finishes to meet different needs. Some of the most commonly used finishes are: 1. Bright: By polishing the steel round bar, a shiny and reflective surface is achieved. This finish is often employed for decorative purposes or when aesthetics are important. 2. Grinded: To achieve a smooth and even surface, the outer layer of the steel round bar is removed using a grinding wheel or abrasive belt. This finish is useful for eliminating imperfections or creating a uniform surface for further processing. 3. Brushed: Fine lines are created on the surface of the steel round bar using a wire brush or abrasive pad. This finish is preferred for its unique aesthetic appeal and is commonly used in architectural applications. 4. Powder-coated: Dry powder is applied to the surface of the steel round bar and then cured using heat. This finish provides a durable and corrosion-resistant coating that can be applied in various colors and textures. 5. Galvanized: A protective zinc coating is applied to the steel round bar to prevent corrosion. This finish is commonly used in outdoor or marine applications where the steel is exposed to moisture or harsh environmental conditions. 6. Oiled: A thin layer of oil is applied to the surface of the steel round bar. This finish offers temporary protection against corrosion and is often used for short-term storage or transportation purposes. 7. Shot-blasted: Small metallic or non-metallic particles are propelled at high speeds onto the surface of the steel round bar. This process creates a textured finish that improves the adhesion of subsequent coatings or paints. Each type of surface finish has its own unique advantages and is selected based on the specific requirements of the application.

Q:Are steel round bars suitable for automotive applications?: Yes, steel round bars are commonly used in automotive applications due to their high strength, durability, and versatility. They are often used to manufacture components such as axles, crankshafts, and suspension systems, as they provide the necessary strength and support required for these critical automotive parts.

Q:What are the advantages of using cobalt-alloy steel round bars?: There are several advantages to using cobalt-alloy steel round bars in various industries and applications. Firstly, cobalt-alloy steel has exceptional strength and hardness, making it highly resistant to wear, corrosion, and high temperatures. This makes it suitable for demanding environments where other materials would fail or degrade quickly. Secondly, cobalt-alloy steel has excellent dimensional stability, meaning it maintains its shape and size even under extreme conditions. This makes it ideal for applications that require precise tolerances and minimal deformation, such as in the aerospace and automotive industries. Additionally, cobalt-alloy steel has excellent heat resistance, allowing it to retain its mechanical properties even at elevated temperatures. This makes it valuable in applications that involve high-speed machining, cutting tools, and turbine components. Moreover, cobalt-alloy steel round bars can be easily machined and fabricated, allowing for customization and versatility in various applications. Their high machinability and weldability make them suitable for use in manufacturing processes, such as forging, casting, and machining. Furthermore, cobalt-alloy steel round bars have excellent fatigue resistance, ensuring long-lasting performance and durability. This makes them suitable for applications that involve repetitive stress or cyclic loading, such as shafts, springs, and fasteners. Lastly, cobalt-alloy steel is known for its biocompatibility, making it suitable for medical and dental applications. It is commonly used in orthopedic implants, surgical tools, and dental instruments due to its corrosion resistance and biocompatibility properties. In summary, the advantages of using cobalt-alloy steel round bars include exceptional strength, hardness, and dimensional stability, as well as heat resistance, machinability, fatigue resistance, and biocompatibility. These qualities make them valuable in a wide range of industries and applications, offering reliability, durability, and performance.

Q:Can steel round bars be used for making handrails?: Indeed, handrails can be crafted using steel round bars. Owing to their robustness and longevity, steel round bars find widespread usage in construction and fabrication. These bars can be effortlessly molded and joined together through welding techniques, resulting in handrails that furnish support and ensure safety for staircases, balconies, and elevated spaces. Furthermore, steel round bars can be adorned with a variety of coatings or treatments, augmenting their resistance to corrosion and enhancing their visual appeal. In summary, steel round bars are a favored option for fabricating handrails due to their durability, adaptability, and capacity to endure rigorous utilization.

Q:What are the advantages of using mild steel round bars?: There are several advantages of using mild steel round bars in various applications. Firstly, mild steel round bars have excellent strength and durability. They are able to withstand high amounts of stress and pressure, making them suitable for use in construction, manufacturing, and engineering projects. The strength of mild steel round bars ensures that they do not easily deform or break under heavy loads, providing a reliable and long-lasting solution. Secondly, mild steel round bars have good weldability. They can be easily joined or attached to other materials through welding, making them versatile in different applications. This allows for easy customization and flexibility in design, as the bars can be shaped and connected to create complex structures or components. Additionally, mild steel round bars have a low carbon content, making them more cost-effective compared to other types of steel. They are readily available and affordable, making them a popular choice in various industries. Moreover, mild steel round bars have good machinability. They can be easily cut, drilled, and shaped using common machining techniques, allowing for easy fabrication and customization. This makes them suitable for a wide range of applications, from construction to automotive components. Lastly, mild steel round bars have good corrosion resistance. While they may not be as corrosion-resistant as stainless steel, they still offer adequate protection against rust and other forms of corrosion. This makes them suitable for outdoor applications or environments with high humidity or exposure to moisture. In summary, the advantages of using mild steel round bars include their excellent strength and durability, good weldability, cost-effectiveness, machinability, and corrosion resistance. These factors make them a reliable and versatile choice for various industrial and construction applications.

Q:What are the advantages of using duplex steel round bars?: One of the main advantages of using duplex steel round bars is their superior strength and corrosion resistance. Duplex steel is a combination of austenitic and ferritic stainless steels, which provides a unique combination of properties. This type of steel offers higher strength compared to austenitic stainless steel, making it suitable for applications that require durability and load-bearing capacity. Additionally, duplex steel round bars exhibit excellent resistance to corrosion, especially in harsh environments such as marine or chemical industries. This resistance to corrosion makes them a cost-effective choice, as they require less maintenance and have a longer lifespan. Overall, the use of duplex steel round bars can improve the longevity, reliability, and performance of various industrial applications.

Q:What is the difference between hot working and cold working of steel round bars?: Hot working and cold working are two different methods used to shape and manipulate steel round bars. Hot working refers to the process of shaping steel at elevated temperatures, typically above the recrystallization temperature of the steel. This allows for the material to be more malleable and easier to shape. Hot working processes include forging, rolling, and extrusion. One of the main advantages of hot working is that it allows for the material to be formed into complex shapes and sizes with minimal force or energy. It also helps to refine the grain structure of the steel, improving its mechanical properties such as strength and toughness. However, hot working can cause oxidation and scale formation on the surface of the steel, which may require additional surface treatments or cleaning. Cold working, on the other hand, involves shaping steel at room temperature or below its recrystallization temperature. Cold working processes include bending, drawing, and cold rolling. Unlike hot working, cold working does not require heating the steel, which can save energy and reduce production costs. It also produces a smoother surface finish and tighter tolerances compared to hot working. Cold working can increase the hardness and strength of the steel, making it suitable for applications that require higher mechanical properties. However, cold working can also make the steel more brittle and prone to cracking. In summary, the main difference between hot working and cold working of steel round bars is the temperature at which the shaping process takes place. Hot working is done at elevated temperatures, allowing for easier shaping and improved mechanical properties, while cold working is done at room temperature or below, resulting in tighter tolerances and increased hardness. The choice between hot working and cold working depends on the desired properties and characteristics of the final product.

Q:What are the different grades of stainless steel round bars for marine applications?: For marine applications, stainless steel round bars come in various grades. The commonly used grades are 304, 316, and 316L stainless steel. Grade 304 stainless steel is a versatile alloy known for its good corrosion resistance, high strength, and excellent formability. It is often utilized in marine applications that require moderate corrosion resistance. Grade 316 stainless steel is similar to grade 304 but contains additional molybdenum. This enhances its corrosion resistance, especially against chlorides and other aggressive marine environments. Grade 316 is preferred in marine settings that demand increased resistance to corrosion. Grade 316L stainless steel is a low carbon version of grade 316. Its resistance to sensitization and intergranular corrosion is further improved. This makes it highly suitable for marine applications that involve welding, reducing the risk of corrosion at the welds. Apart from these grades, there are specialized stainless steel alloys like duplex stainless steel. These alloys combine the advantages of austenitic and ferritic stainless steels, offering even greater corrosion resistance and strength. They are suitable for demanding marine applications. When choosing stainless steel round bars for marine applications, it is crucial to consider specific environmental conditions such as exposure to saltwater, chemicals, or high temperatures. Seeking guidance from a materials specialist or referring to industry standards can help ensure the appropriate grade is selected for the specific marine application.

Q:What are the advantages of using nickel-chromium alloy steel round bars?: Using nickel-chromium alloy steel round bars in various applications offers several benefits. Firstly, these round bars possess outstanding corrosion resistance properties. The inclusion of nickel and chromium elements in the alloy enhances its ability to withstand corrosion from moisture, chemicals, and oxidation, making it suitable for use in challenging environments like marine applications, chemical processing plants, and oil refineries. Secondly, these round bars exhibit high temperature resistance. The combination of nickel and chromium in the alloy allows it to endure elevated temperatures without compromising its structural integrity. This makes them ideal for use in heat exchangers, furnaces, and other high-temperature applications. Furthermore, these round bars boast exceptional mechanical properties. They demonstrate excellent strength, toughness, and wear resistance, making them ideal for applications that require high load-bearing capabilities. Additionally, they exhibit good ductility, enabling easy machining and fabrication. Additionally, these round bars possess good electrical conductivity, making them suitable for electrical and electronic applications where conductivity is crucial, such as in the manufacturing of resistors, heating elements, and electrical connectors. Lastly, these round bars are readily available and cost-effective. Being a widely used material in various industries, they are easily accessible and can be obtained at competitive prices. In conclusion, the advantages of utilizing nickel-chromium alloy steel round bars encompass excellent corrosion resistance, high-temperature resistance, superior mechanical properties, good electrical conductivity, and cost-effectiveness. These characteristics make them the preferred choice for a wide range of applications in industries such as construction, automotive, aerospace, and electrical engineering.

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