aisi 4140 carbon alloy steel round bars System 1

aisi 4140 carbon alloy steel round bars System 2

aisi 4140 carbon alloy steel round bars System 3

aisi 4140 carbon alloy steel round bars System 4

aisi 4140 carbon alloy steel round bars

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Loading Port:: Shanghai

Payment Terms:: TT OR LC

Min Order Qty:: 30 m.t.

Supply Capability:: 120000 m.t./month

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GB	DIN	AISI	JIS
42CrMo	1.7225	4140	SCM440

C	Si	Mn	Cr	Mo	P	S
0.38-0.43	0.40max	0.60-0.90	0.90-1.20	0.15-0.30	≤0.035	≤0.035

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)

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.

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

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

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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.

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30% TT as deposit and 70% before delivery.

Irrevocable L/C at sight.

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Packaging & Delivery

1, Packaging: seaworthy package or as required

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

Q: Can steel round bars be used for making agricultural equipment or machinery?: Yes, steel round bars can be used for making agricultural equipment or machinery. Steel is a versatile and durable material that is commonly used in the manufacturing of various agricultural equipment and machinery. Steel round bars, in particular, are often utilized for making components such as shafts, axles, and rods that are crucial for the functioning of agricultural machinery. These round bars provide strength, stability, and resistance to wear and tear, making them suitable for heavy-duty applications in the agricultural industry. Additionally, steel is also corrosion-resistant, which is especially important in agriculture where equipment is exposed to harsh environmental conditions. Overall, steel round bars are a reliable choice for constructing agricultural equipment or machinery due to their mechanical properties and ability to withstand the demanding conditions of agricultural operations.

Q: What is the difference between hot rolled and cold drawn steel round bars?: Hot rolled steel round bars undergo the process of heating a steel billet or ingot at a high temperature and subsequently rolling it into the desired shape. This process yields a rougher surface finish and a greater diameter tolerance in comparison to cold drawn steel round bars. The usage of hot rolled bars is frequently found in areas where strength and durability hold significance, such as in construction and manufacturing. On the contrary, cold drawn steel round bars are created by pulling a hot rolled bar through a die at room temperature, leading to a smoother surface finish and tighter diameter tolerances. This procedure also enhances the mechanical properties of the steel, including its strength and hardness. Cold drawn bars are often employed in scenarios where precision and a high-quality surface finish are prerequisites, like in the production of shafts, bolts, and precision components. To summarize, the principal disparities between hot rolled and cold drawn steel round bars encompass the surface finish, diameter tolerance, and mechanical properties. Hot rolled bars bear a rougher surface finish, larger diameter tolerances, and are typically utilized in contexts where strength and durability are paramount. Cold drawn bars possess a smoother surface finish, tighter diameter tolerances, and are commonly employed in situations necessitating precision and a high-quality surface finish.

Q: What are the advantages of using nickel-titanium alloy steel round bars?: There are several advantages of using nickel-titanium (NiTi) alloy steel round bars. First and foremost, NiTi alloy steel round bars exhibit exceptional shape memory and superelasticity properties. This means that they can be deformed or bent, and then return to their original shape upon heating or removal of stress. This unique characteristic makes NiTi alloy steel round bars ideal for applications where flexibility and resilience are required, such as in the medical field for surgical instruments or orthodontic wires. Another advantage of using NiTi alloy steel round bars is their high corrosion resistance. Nickel and titanium are both highly resistant to corrosion, making the alloy extremely durable and long-lasting. This makes them suitable for various industrial applications, including marine environments, where exposure to moisture and saltwater can lead to corrosion of other metals. Additionally, NiTi alloy steel round bars have a high strength-to-weight ratio. Despite being lightweight, they possess excellent mechanical properties, including high tensile strength and good fatigue resistance. This makes them suitable for various engineering and structural applications, such as in aerospace, automotive, and construction industries. The lightweight nature of the bars also allows for easier handling and transportation. Furthermore, NiTi alloy steel round bars have excellent thermal stability, with a wide temperature range of usability. They can withstand extreme temperatures without losing their shape memory or superelasticity properties. This makes them suitable for applications that involve exposure to high or low temperatures, such as in aerospace or oil and gas industries. In summary, the advantages of using nickel-titanium alloy steel round bars include their shape memory and superelasticity properties, high corrosion resistance, high strength-to-weight ratio, and excellent thermal stability. These qualities make NiTi alloy steel round bars a versatile and reliable choice for a wide range of applications across various industries.

Q: What are the different types of steel round bars used in the manufacturing of springs?: There are several different types of steel round bars commonly used in the manufacturing of springs. These include: 1. Carbon steel round bars: These are the most commonly used type of steel for springs. They have a high carbon content, typically ranging from 0.60% to 0.95%. Carbon steel round bars offer good strength and durability, making them suitable for a wide range of spring applications. 2. Alloy steel round bars: These are made by adding alloying elements such as chromium, manganese, nickel, or vanadium to carbon steel. Alloy steel round bars provide enhanced mechanical properties, including higher strength, toughness, and resistance to wear and corrosion. They are often used in heavy-duty or high-performance spring applications. 3. Stainless steel round bars: These are corrosion-resistant steel bars with a high chromium content (usually above 10.5%). Stainless steel round bars are popular for springs that require excellent resistance to rust, oxidation, and chemicals. They are commonly used in applications where hygiene, cleanliness, and aesthetic appeal are important, such as in the food and medical industries. 4. Spring steel round bars: These are specifically designed for spring manufacturing. They have a unique combination of properties, including high yield strength, good fatigue resistance, and excellent elasticity. Spring steel round bars are typically made from either carbon steel or alloy steel, depending on the specific requirements of the application. It is important to choose the right type of steel round bar based on factors such as the intended application, load requirements, environmental conditions, and desired spring performance. Consulting with a materials engineer or spring manufacturer can help determine the most suitable steel round bar for a specific spring manufacturing project.

Q: 20 round bars are of several grades: No. 20 cold drawn steel belongs to high quality low carbon steel, cold extrusion, carburizing hardened steel. The steel has low strength, toughness, plasticity and weldability. The tensile strength is 355-500MPa, elongation is greater than or equal to 24%.

Q: Can steel round bars be used in the manufacturing of architectural features?: Yes, steel round bars can certainly be used in the manufacturing of architectural features. Steel is a versatile and durable material that can be shaped and formed into various architectural elements such as columns, beams, handrails, and decorative features. Its strength and resistance to corrosion make it suitable for both structural and decorative purposes in the construction of buildings and other architectural designs.

Q: Can steel round bars be used for making decorative items?: Yes, steel round bars can definitely be used for making decorative items. Steel round bars are versatile and can be shaped, bent, and welded to create various decorative designs. They offer durability and strength, making them suitable for both indoor and outdoor applications. Steel round bars can be used to make decorative furniture, sculptures, railings, gates, light fixtures, and much more. Their sleek and modern appearance adds an industrial and contemporary touch to any space. Additionally, steel round bars can be finished with different coatings or treatments, such as powder coating or patina, to enhance their visual appeal and protect them from corrosion. Therefore, steel round bars are an excellent choice for creating decorative items due to their versatility, strength, and ability to add a stylish and unique touch to any design.

Q: Are steel round bars resistant to UV radiation?: Steel round bars are not typically resistant to UV radiation. UV radiation can cause steel to undergo a process known as oxidation, which results in the formation of rust. This can weaken the structural integrity of the steel and potentially cause it to deteriorate over time. To protect steel round bars from UV radiation, they can be coated with a protective layer, such as paint or a specialized coating, that acts as a barrier against UV rays. Additionally, storing steel round bars in a shaded area or using a cover can help minimize their exposure to UV radiation and extend their lifespan.

Q: How do you measure the diameter tolerance of a steel round bar?: To measure the diameter tolerance of a steel round bar, you can follow the steps below: 1. Obtain a caliper or micrometer: These measuring tools are commonly used to measure the diameter of objects accurately. 2. Set the measuring tool: If you are using a caliper, adjust the jaws to the appropriate size range. For a micrometer, ensure it is zeroed correctly. 3. Position the round bar: Place the steel round bar on a flat and stable surface, ensuring that it is not rolling or moving. 4. Take the measurement: Use the measuring tool to capture the diameter of the round bar. For accurate results, make sure the tool is perpendicular to the bar and apply gentle pressure to get an accurate reading. 5. Repeat the measurement: To ensure accuracy, take multiple measurements at different points along the length of the round bar. This will account for any variations or deviations in the bar's diameter. 6. Calculate the average diameter: Add up all the measurements and divide by the number of measurements taken. This will give you the average diameter of the round bar. 7. Compare with the tolerance range: Consult the specifications or standards provided for the steel round bar to determine the allowable tolerance range. This range will indicate the acceptable variation in diameter for the bar. 8. Analyze the results: Compare the average diameter obtained from your measurements with the specified tolerance range. If the average diameter falls within the tolerance range, the round bar meets the required specifications. However, if it falls outside the range, the bar may not meet the required tolerance and might need further inspection or adjustment. By following these steps, you can effectively measure the diameter tolerance of a steel round bar and ensure it meets the necessary specifications for your intended application.

Q: What are the different types of steel round bar alloys for improved toughness and wear resistance?: There are several different types of steel round bar alloys that are known for improved toughness and wear resistance. Some of these alloys include tool steel, stainless steel, alloy steel, and carbon steel. Each of these alloys has unique properties and compositions that make them suitable for various applications where toughness and wear resistance are crucial.

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