High Strength Steel Round Bar 4140 Round Bar Steel

High Strength Steel Round Bar 4140 Round Bar Steel System 1

High Strength Steel Round Bar 4140 Round Bar Steel System 2

High Strength Steel Round Bar 4140 Round Bar Steel System 3

High Strength Steel Round Bar 4140 Round Bar Steel System 4

High Strength Steel Round Bar 4140 Round Bar Steel

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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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1,Size of 4140 Carbon Alloy Steel
Round bar	Diameter(mm)	Length (mm)
20~800	3000~9000
Plate	Thickness(mm)	Width (mm)	Length (mm)
Max:800	Max:2200	Max:9000
The specification can be customized.
2,Chemical Compositons
Grade	C	Si	Mn	P	S	Cr	Mo	Ni
42CrMo	0.38~0.45	0.17~0.37	0.50~0.8	≤0.035	≤0.035	0.9~1.2	0.15-0.25	≤0.3
4140	0.40~0.45	0.15~0.35	0.75~1.0	≤0.035	≤0.040	0.8~1.1	0.15-0.25	-
SCM44	0.38~0.43	0.15~0.35	0.60~0.9	≤0.030	≤0.030	0.9~1.2	0.15-0.30	≤0.25
1.7225	0.38~0.45	≤0.40	0.60~0.9	≤0.025	≤0.035	0.9~1.2	0.15-0.30
3,Features of 4140 alloy steel
1, Chromium molybdenum alloy steel
2, Slightly higher carbon content then 4130
3, Greater strength and heat treatment
4,Typical Applications
1, Applications in the oil and gas sector
2, Connection rods, collets, conveyor pins,
3, Gears, stem assemblies,
4, Pump shafts and tool holders

Alloy Steel	5140,5115,5120,5130,5145,4118,4130,4135,6150,5115,4142,4130,4118,6150,4140,4720,4320 ,E9310,8620,4340
Tool Steel	H13,1.2344,SKD61,D2,SKD11,1.2379,1.2510,01,SKS3,95MnWCr5,D3,SKD1,1.2419, SKS31,H21,SKD5,1.2581,P20,35CrMo7,1.2738,1.2316,M2
Bearing Steel	GCr15,52100,SUJ1,SUJ2,100Cr6,1.2067,55C,8620,4320,9310,440C,M50
Spring Steel	9260,SUP6,SUP7,1.7108,54SiCr6,1.7102,5155,SUP9,1.7176,5160,1.7177,6150, SUP10,51CrV4,1.8159
Stainless Steel	321,sus321,1.4541,304,SUS304,1.4301,410,SUS410,1.4006,420,1.4021,1.4028, 434,1.4113,316L,SUS316L,1.4435,630,1.4542,431,1.4057,201,202,301

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 other materials like aluminum or stainless steel?: Steel round bars possess numerous advantages over alternative materials such as aluminum or stainless steel. Firstly, their exceptional strength and durability are widely acknowledged. With a high tensile strength, they are capable of enduring heavy loads and extreme conditions, making them ideal for construction, manufacturing, and engineering applications where strength and resilience are vital. When compared to aluminum, steel round bars exhibit superior strength and hardness. Although aluminum is lightweight, it lacks the same level of strength as steel, which can restrict its use in certain applications. Furthermore, steel round bars offer increased resistance to impact and abrasion, making them more suitable for heavy-duty applications that necessitate resistance to wear and tear. Regarding stainless steel, it is essential to note that it is an alloy that primarily contains steel. Stainless steel is renowned for its corrosion resistance, making it an excellent choice for applications exposed to moisture or harsh environments. However, stainless steel does not possess the same strength as steel round bars. Steel round bars excel in carrying heavier loads and providing superior structural integrity. Another crucial aspect to consider is the cost-effectiveness of steel round bars compared to aluminum or stainless steel. Generally, steel is more affordable than stainless steel and aluminum, making it a popular choice across a broad range of applications. Additionally, steel round bars are readily available in various sizes and grades, offering versatility and ease of use. In conclusion, steel round bars outperform alternative materials like aluminum or stainless steel in terms of strength, durability, and cost-effectiveness. However, the ultimate choice of material depends on the specific requirements of the application and the desired properties necessary for the project.

Q:Can steel round bars be used in the production of electrical equipment?: Yes, steel round bars can be used in the production of electrical equipment. Steel is a highly versatile and durable material that can provide structural support and conductivity in various electrical components. The round shape of the bars allows for easy fabrication and assembly, making them suitable for use in electrical equipment manufacturing.

Q:What is the difference between a bright and a precision ground steel round bar?: A bright steel round bar and a precision ground steel round bar are two different types of steel bars with distinct characteristics and manufacturing processes. The main difference between a bright steel round bar and a precision ground steel round bar lies in their surface finish and manufacturing tolerances. A bright steel round bar, also known as a bright mild steel bar or a bright mild steel round bar, undergoes a process called bright drawing. This process involves pulling the steel bar through a die to achieve a smooth and shiny surface finish. As a result, bright steel round bars have a highly polished appearance and a clean, smooth texture. They are commonly used in decorative applications, such as in the manufacturing of furniture, automotive accessories, and architectural elements. On the other hand, a precision ground steel round bar is manufactured with tight dimensional tolerances and precise surface finishes. These bars are typically made through the process of precision grinding, where the steel bar is machined to achieve a specific diameter and surface finish. Precision ground steel round bars are known for their accuracy and consistency in size, making them suitable for applications that require close tolerance and high precision, such as in the manufacturing of bearings, shafts, and hydraulic cylinders. In summary, the key difference between a bright steel round bar and a precision ground steel round bar lies in their surface finish and manufacturing tolerances. A bright steel bar has a polished appearance and is used primarily for decorative purposes, while a precision ground steel bar is machined to precise dimensions and is suitable for applications that require high precision and close tolerances.

Q:Can steel round bars be welded to other materials?: Other materials can indeed be joined with steel round bars through welding. Welding is a widely used technique for merging various materials, including steel round bars, aluminum, stainless steel, and even non-metallic substances like plastics. However, it is vital to emphasize that successful welding depends on the compatibility of the materials being joined. To ensure a robust and long-lasting bond between the steel round bar and the other material, the welding process necessitates the use of appropriate techniques, filler metals, and sometimes pre-heating or post-weld heat treatment. Moreover, it is important to consider the specific application and the desired properties of the joint in order to determine the most suitable welding method and materials.

Q:Why is it better to use round steel than flat steel in lightning protection?: Of course, the contact area of flat steel and soil are large, relatively scattered large flow area, the construction is more convenient, in terms of price, we are willing to use flat, as for the problem of anti-corrosion, anti-corrosion paint, zinc can be taken, you know, the thickness of galvanized steel pipe is generally not flat, so true to see the term for the use of galvanized flat steel is not bad.

Q:What are the different grades of steel used for round bars?: Round bars are commonly made from different grades of steel, each with its own composition and properties. These grades are suitable for various applications. Some widely used grades for round bars include: 1. Mild Steel (Low Carbon Steel): This is the most commonly used and basic grade of steel. It has a low carbon content, making it inexpensive and easy to work with. Mild steel round bars find applications in construction, automotive, and general engineering. 2. Carbon Steel: With higher carbon levels than mild steel, carbon steel offers improved strength and hardness. Round bars made from carbon steel are often used in high-stress applications like structural components, axles, and shafts. 3. Alloy Steel: By adding elements like chromium, nickel, or molybdenum to the base steel, alloy steel round bars enhance strength, toughness, and resistance to corrosion. They are commonly used in aerospace, automotive, and machinery industries. 4. Stainless Steel: Known for its corrosion resistance due to high chromium content, stainless steel round bars offer excellent strength, durability, and resistance to rust and staining. They are widely utilized in the food industry, marine applications, and architectural components. 5. Tool Steel: Designed specifically for high hardness, wear resistance, and heat resistance, tool steel round bars are commonly used in the manufacturing of cutting tools, dies, and molds. These examples demonstrate the variety of steel grades suitable for round bars. Each grade possesses unique properties, making them ideal for diverse applications across different industries.

Q:What is the difference between a centerless ground and a polished steel round bar?: A centerless ground steel round bar is a type of steel bar that has been ground to achieve precise dimensions and a smooth surface finish. The grinding process involves removing material from the outer diameter of the bar, resulting in a consistent diameter and improved dimensional accuracy. On the other hand, a polished steel round bar is a steel bar that has been subjected to a polishing process to enhance its appearance and provide a reflective, shiny surface. While both processes improve the surface finish, centerless grinding focuses more on dimensional accuracy and consistency, while polishing emphasizes aesthetics and visual appeal.

Q:Weight algorithm of round steel: 1, the appearance is different, round steel appearance of round, no grain without ribs, other steel surface appearance has carved or ribbed, this causes the round bar and concrete bonding force is small, and other steel and concrete bonding force.2 ingredients are different, round steel (grade a steel) belongs to ordinary low carbon steel, and other steel bars are mostly alloy steel. 3 strength, steel and other steel with high strength low strength, namely, diameter of the same size as compared with other steel, round steel can bear the pulling force than other reinforced small, but the plastic steel reinforced bar is stronger than the other, there is a large deformation in the break before, and it reinforced the deformation the break before the much smaller.

Q:What is the difference between a seamless and a welded steel round bar?: The main difference between a seamless and a welded steel round bar lies in their manufacturing process and the resulting structural integrity. A seamless steel round bar is produced by piercing a solid billet of steel and then rolling it into a round shape. This process ensures that there are no seams or welds in the bar, resulting in a smooth and continuous surface throughout its length. The absence of a weld eliminates the potential weaknesses and vulnerabilities associated with welded joints. Seamless steel bars are typically more uniform in composition and have a higher strength-to-weight ratio due to the absence of welds. On the other hand, a welded steel round bar is 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 the welding process provides flexibility in terms of length and diameter options, the presence of a weld can introduce certain structural concerns. Welded joints may be prone to defects, such as porosity or inclusions, which can compromise the overall strength and integrity of the bar. However, advancements in welding technology and quality control have significantly improved the reliability of welded steel round bars. In terms of applications, seamless steel round bars are often preferred in critical industries where high strength, reliability, and resistance to corrosion are essential. These industries may include oil and gas, aerospace, and automotive sectors. Welded steel round bars, on the other hand, are commonly used in less demanding applications where cost-effectiveness and availability are primary factors, such as construction, manufacturing, and general engineering. In summary, the key differences between seamless and welded steel round bars lie in their manufacturing process and resulting structural characteristics. Seamless bars are produced without any welds, offering a smoother surface, higher strength-to-weight ratio, and greater resistance to defects. Welded bars, while more cost-effective and readily available, may have weld-related vulnerabilities that need to be considered depending on the application. Ultimately, the choice between the two depends on the specific requirements and priorities of the intended use.

Q:Are steel round bars used in the aerospace industry?: Yes, steel round bars are commonly used in the aerospace industry. Steel round bars are known for their high strength, durability, and resistance to corrosion, making them ideal for use in aircraft components and structures. These round bars are often used in the manufacturing of landing gears, engine mounts, structural frames, and other critical parts of an aircraft. Additionally, steel round bars are also used in the production of aerospace fasteners, such as bolts and screws, due to their ability to withstand high stress and provide a secure connection. Overall, steel round bars play a crucial role in ensuring the safety and reliability of aerospace systems.

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