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.

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 differ from steel square bars?: Steel round bars and steel square bars differ in their shape and appearance. Steel round bars, as the name suggests, have a circular cross-section and are cylindrical in shape. This shape makes them ideal for applications that require strength and stability, such as construction, manufacturing, and engineering. The circular shape allows for equal distribution of stress and load, making round bars highly resistant to bending or twisting forces. They are commonly used as structural components in buildings, support beams, shafts, and axles. On the other hand, steel square bars have a square cross-section with four equal sides and sharp corners. This shape provides additional benefits in certain applications. Square bars offer better grip and handling, as they have flat surfaces, making them easier to hold, stack, or secure in place during fabrication or installation. They are often used for manufacturing machinery, tools, frames, and brackets where square edges are needed for precise alignment or stability. Both steel round bars and steel square bars are available in various grades and alloys, offering different levels of strength, hardness, and corrosion resistance. The choice between the two depends on the specific requirements of the project or application.

Q: What are the different surface finishes available for steel round bars?: There are several different surface finishes available for steel round bars, including hot rolled, cold drawn, polished, turned, and ground.

Q: Difference between round bar and threaded steel in use.: Because the surface has a thread shape, it can increase the firm bond with the concrete. The longitudinal reinforcement and stirrups shall be used preferentially in the concrete members.

Q: Can steel round bars be used for valve stem applications?: Yes, steel round bars can be used for valve stem applications. Steel round bars are commonly used in various industrial applications due to their high strength and durability. In valve stem applications, steel round bars are often used to provide stability and structural support to the valve stem, ensuring smooth operation and long-term performance. Additionally, steel round bars can be easily machined and fabricated to meet specific requirements, making them a versatile choice for valve stem applications.

Q: What are the different types of surface treatments for steel round bars?: There are several types of surface treatments commonly used for steel round bars. These include hot-dip galvanizing, electroplating, painting, powder coating, and black oxide coating. Each treatment offers specific benefits and is chosen based on the desired level of corrosion resistance, aesthetics, and durability required for the application.

Q: What are the different standards for steel round bars?: There are several different standards for steel round bars, which vary by country and industry. Some of the commonly used standards include: 1. ASTM A36: This standard is widely used in the United States and specifies the requirements for carbon structural steel, including round bars. It covers the chemical composition, mechanical properties, and dimensional tolerances of the steel. 2. EN 10025: This European standard covers structural steel, including round bars, and is used in many European countries. It defines the chemical composition, mechanical properties, and technical delivery conditions for the steel. 3. JIS G3101: This Japanese standard is commonly used in Asia and specifies the general requirements for hot-rolled steel, including round bars. It covers the chemical composition, mechanical properties, and dimensional tolerances of the steel. 4. DIN 17100: This German standard is widely used in Germany and other European countries. It defines the general structural steels, including round bars, and provides details on the chemical composition, mechanical properties, and technical delivery conditions. 5. BS 970: This British standard covers various types of steel, including round bars, and provides specifications for their chemical composition, mechanical properties, and dimensional tolerances. These are just a few examples of the many standards for steel round bars. It's important to consult the appropriate standard for specific applications to ensure the desired properties and quality of the steel.

Q: Can steel round bars be used in the mining industry?: Yes, steel round bars can be used in the mining industry. They are commonly used for various applications such as support structures, equipment fabrication, and reinforcement in underground mines and surface mining operations. Steel round bars offer high strength, durability, and resistance to abrasion and impact, making them suitable for demanding mining environments.

Q: Can steel round bars be used for making conveyor belts?: No, steel round bars cannot be used for making conveyor belts. Conveyor belts are typically made from materials like rubber or fabric, which provide flexibility and durability necessary for their function. Steel round bars are rigid and not suitable for this purpose.

Q: What is the difference between a seamless and a welded steel round bar?: The manufacturing process and resulting structural integrity are what differentiate seamless and welded steel round bars. Seamless steel round bars are made by piercing a solid billet of steel and then rolling it into a round shape. This process ensures a smooth and continuous surface throughout the length of the bar, without any seams or welds. By eliminating the weld, potential weaknesses and vulnerabilities are also eliminated. Seamless steel bars have a more uniform composition and a higher strength-to-weight ratio due to the absence of welds. On the other hand, welded steel round bars are created by joining multiple pieces of steel together using various welding techniques. The steel pieces are heated and fused together at the edges to form a continuous bar. While welding provides flexibility in terms of length and diameter options, it can introduce structural concerns. Welded joints may have defects like porosity or inclusions, which can compromise the overall strength and integrity of the bar. However, advancements in welding technology and quality control have improved the reliability of welded steel round bars. Seamless steel round bars are preferred in critical industries like oil and gas, aerospace, and automotive sectors, where high strength, reliability, and resistance to corrosion are essential. On the other hand, welded steel round bars are commonly used in less demanding applications like construction, manufacturing, and general engineering, where cost-effectiveness and availability are more important. In conclusion, the manufacturing process and resulting structural characteristics are what set seamless and welded steel round bars apart. Seamless bars offer a smoother surface, higher strength-to-weight ratio, and greater resistance to defects, while welded bars are more cost-effective and readily available, though they may have weld-related vulnerabilities. The choice between the two depends on the specific requirements and priorities of the intended use.

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