C40 Carbon Steel Round Bars

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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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C	Si	Mn	S max	P max	B
0.37-0.44	0.17-0.37	0.35-0.90	0.035	0.035	0.0008-0.003

Yield strength(MPa)	Tensile strength(MPa)	Elongation(%)	Reduction of area(%)	AKV(J)	Hardness(HB)
335	570	219	45	47	217

Sizes detalis	diameter	10-310mm
Sizes detalis	length	3-12m(canbe customerized)
Sizes tolerance	length	+/-100mm(max)
Sizes tolerance	diameter	+/-2mm(max)
Sizes tolerance	Straightness	3mm/m(max)

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:What is the difference between a hot rolled and a turned steel round bar?: The manufacturing process and resulting characteristics distinguish a hot rolled steel round bar from a turned steel round bar. To produce a hot rolled steel round bar, steel billets or ingots are heated to a high temperature and then rolled into the desired shape. This process facilitates easy forming and shaping, resulting in a bar with a rough surface and a slightly rounded or irregular shape. Hot rolling also enhances the overall strength and toughness of the steel, making it suitable for various applications. In contrast, a turned steel round bar is machined on a lathe from a hot rolled or cold drawn bar. This machining process involves removing material from the bar's surface using cutting tools, resulting in a smooth and precise finish. Turning allows for superior dimensional accuracy and control over the final shape and size of the bar. Regarding surface finish and dimensional accuracy, a turned steel round bar generally provides a higher level of precision compared to a hot rolled bar. The turned bar possesses a smoother surface with fewer imperfections, making it ideal for applications where appearance and aesthetics are important. Furthermore, the turned bar typically adheres to tighter tolerances, ensuring consistent dimensions throughout its length. The choice between a hot rolled and a turned steel round bar depends on the specific requirements of the application. Hot rolled bars are commonly employed in construction, manufacturing, and general engineering applications where strength and toughness play crucial roles. On the other hand, turned bars are frequently utilized in industries such as automotive, aerospace, and precision machining, where a high level of surface finish and dimensional accuracy is necessary. In conclusion, the distinction between a hot rolled and a turned steel round bar can be attributed to the manufacturing process and resulting characteristics. Hot rolled bars offer strength and toughness, while turned bars provide a smoother surface finish and greater dimensional accuracy. The choice ultimately hinges on the specific needs of the application.

Q:What is the hardness of a steel round bar?: The hardness of a steel round bar may differ depending on the type of steel and the manufacturing process utilized. To measure the hardness of steel, the Rockwell hardness scale is commonly employed. This scale determines the depth of indentation caused by a specific load on a diamond or steel ball. Steel round bars generally exhibit hardness values ranging from approximately 20 to 60 Rockwell C (HRC), with higher values indicating greater hardness. However, it is crucial to acknowledge that the hardness of a steel round bar can also be affected by factors such as heat treatment, alloying elements, and any applied surface treatments. Consequently, it is imperative to refer to the manufacturer or supplier's specified hardness specifications to accurately ascertain the hardness of a steel round bar.

Q:Are steel round bars prone to deformation?: When steel round bars are manufactured and used correctly, they usually do not deform. Steel is recognized for its strong tensile strength and durability, which means it can resist bending or warping in normal situations. However, it is essential to remember that excessive force or mishandling can still lead to deformation in steel round bars. Overloading, improper storage, or using inappropriate machining techniques can all contribute to the bars bending or twisting. Hence, it is vital to adhere to recommended guidelines and industry standards to guarantee the durability and longevity of steel round bars.

Q:Can steel round bars be used in the construction equipment industry?: Yes, steel round bars are commonly used in the construction equipment industry. Steel round bars are known for their strength, durability, and versatility, making them suitable for various applications in construction equipment. They can be used to manufacture components such as axles, shafts, pins, and fasteners. The high strength of steel round bars ensures that the construction equipment can withstand heavy loads and harsh working conditions. Additionally, steel round bars can be easily machined and welded, allowing manufacturers to create complex and customized designs for construction equipment. Overall, steel round bars are widely utilized in the construction equipment industry due to their exceptional mechanical properties and ability to enhance the performance and longevity of the equipment.

Q:What are the advantages of using case-hardening steel round bars?: Case-hardening steel round bars offer several benefits for various applications. To begin with, these round bars possess a toughened outer layer, known as the "case," while maintaining a softer and more malleable core. This unique combination allows for exceptional surface wear resistance, making them highly suitable for situations where the material encounters abrasive or erosive forces. Furthermore, the hardened outer layer enhances the overall strength and durability of the round bars, thereby extending their lifespan. Another advantage of case-hardening steel round bars lies in their remarkable ability to withstand heavy impact loads. The hardened outer layer acts as a protective barrier, effectively absorbing and dispersing the energy from impacts, thus preventing any deformation or breakage. This makes them particularly well-suited for applications involving substantial loads or impacts, such as in the fields of machinery or construction equipment. Moreover, case-hardening steel round bars provide enhanced resistance against fatigue. The hardened surface layer aids in distributing stresses evenly, reducing the likelihood of cracks or fractures developing during cyclic loading conditions. Consequently, they prove to be an excellent choice for applications that demand long-term durability and the ability to withstand repeated stress, such as in automotive components or gears. Additionally, these round bars demonstrate excellent machinability. The soft and malleable core allows for easy cutting, drilling, and shaping, while the hardened surface ensures the necessary wear resistance. This aspect makes them both cost-effective and efficient to work with, enabling them to be effortlessly molded into various shapes and sizes to meet specific design requirements. In conclusion, the utilization of case-hardening steel round bars offers a plethora of advantages, including outstanding wear resistance, high impact load resistance, improved fatigue resistance, and excellent machinability. These characteristics render them a versatile and dependable choice for a wide array of applications across industries such as automotive, construction, and manufacturing.

Q:What are the advantages of using low-alloy steel round bars?: Low-alloy steel round bars have become popular in various industries due to several advantages they offer. Firstly, they provide greater strength and durability compared to regular carbon steel, making them suitable for applications requiring high strength and resistance to wear and tear. The addition of alloying elements like manganese, chromium, and nickel enhances the hardness and toughness of the steel, ensuring its reliability and long-lasting nature. Secondly, low-alloy steel round bars exhibit excellent weldability and machinability. The presence of alloying elements allows for better control over the grain structure, resulting in improved weldability. This means that these bars can be easily welded and fabricated into complex shapes without compromising their structural integrity. Additionally, their machinability enables efficient processing and customization according to specific requirements. Furthermore, low-alloy steel round bars offer enhanced resistance to corrosion and atmospheric conditions. The alloying elements create a protective oxide layer on the surface, preventing rusting and deterioration over time. This makes them ideal for outdoor applications in harsh environments, such as construction, marine, and oil and gas industries. Moreover, low-alloy steel round bars are a cost-effective alternative to higher-alloy or stainless steel options. While providing similar strength and performance, low-alloy steel is generally more affordable, making it a viable option for projects with budget constraints. This cost-effectiveness, combined with their durability and versatility, makes low-alloy steel round bars a preferred choice for a wide range of applications. In conclusion, the advantages of low-alloy steel round bars include increased strength and durability, excellent weldability and machinability, resistance to corrosion, and cost-effectiveness. These properties make them a reliable and versatile material for various industries, contributing to their widespread use in numerous applications.

Q:Can steel round bars be used for pump shaft applications?: Yes, steel round bars can be used for pump shaft applications. Steel round bars are often chosen for pump shafts due to their high strength, durability, and resistance to corrosion. Additionally, steel round bars can be easily machined and provide excellent surface finish, making them suitable for various pump shaft applications.

Q:The difference between round steel and screw steel: Round steel is a solid strip of steel whose cross section is round. The specifications are expressed in millimeters of diameter, such as "50", which means a round bar of 50 millimeters in diameter.

Q:What is the difference between a centerless ground and a precision ground steel round bar?: The main difference between a centerless ground and a precision ground steel round bar lies in the manufacturing process and the resulting quality of the finished product. A centerless ground steel round bar is manufactured using a machining technique called centerless grinding. In this process, the steel bar is placed between two grinding wheels, one rotating at a high speed and the other stationary. The rotating wheel removes material from the bar's surface, creating a smooth and evenly-sized round shape. Centerless grinding is known for its ability to produce bars with tight tolerances and excellent surface finish. On the other hand, a precision ground steel round bar is manufactured using a different process called precision grinding. In precision grinding, the steel bar is held in a chuck or fixture and rotated against a grinding wheel. The grinding wheel removes material from the bar's surface, creating a precise round shape with tight tolerances. Precision grinding is often used when a higher level of accuracy is required, such as in applications where the bar will be used as a critical component in machinery or tools. In summary, both centerless ground and precision ground steel round bars offer a high level of dimensional accuracy and surface finish. However, centerless grinding is a more efficient and cost-effective process for producing large quantities of round bars with consistent quality, while precision grinding is preferred for applications that require the highest level of dimensional accuracy and surface finish.

Q:What is the difference between a smooth and a precision ground steel round bar?: A smooth steel round bar refers to a steel rod that has a plain surface without any specific surface treatment or finishing process. It is typically produced through hot rolling or cold drawing methods, resulting in a basic cylindrical shape with a relatively rough surface texture. Smooth steel round bars are commonly used in various applications where a smooth exterior finish is not a critical requirement. On the other hand, a precision ground steel round bar undergoes an additional manufacturing process to achieve a more precise and refined surface finish. The precision grinding process involves removing any imperfections or irregularities from the surface of the steel rod, resulting in a highly smooth and polished finish. This process ensures that the diameter of the round bar remains consistent along its length and that the surface has a superior level of finish and accuracy. Precision ground steel round bars are widely used in applications that demand tight tolerances, precision machining, or where a smooth and polished surface is essential. Industries such as aerospace, automotive, tooling, and manufacturing often rely on precision ground steel round bars for their high-quality surface finish, dimensional accuracy, and reliable performance. In summary, the main difference between a smooth and a precision ground steel round bar lies in the surface finish and level of precision achieved. While a smooth steel round bar has a basic, rough surface texture and is suitable for general applications, a precision ground steel round bar undergoes additional grinding processes to achieve a highly smooth, polished, and accurate surface finish, making it ideal for applications requiring tight tolerances and precision machining.

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