Hot Rolled Alloy Structural Steel Round Bar SCM440

Hot Rolled Alloy Structural Steel Round Bar SCM440 System 1

Hot Rolled Alloy Structural Steel Round Bar SCM440 System 2

Hot Rolled Alloy Structural Steel Round Bar SCM440 System 3

Hot Rolled Alloy Structural Steel Round Bar SCM440 System 4

Hot Rolled Alloy Structural Steel Round Bar SCM440

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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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Standard	Grade	C	Cr	Mo	Si	Mn	P	S	Ni	Cu

GB	42CrMo	0.38-0.45	0.90-1.20	0.15-0.25	0.17-0.37	0.50-0.80	0.035	0.035	0.3	0.3
JIS	SCM440	0.38-0.43	0.90-1.20	0.15-0.30	0.15-0.35	0.60-0.90	0.03	0.03	0.25	0.3
ASTM	4140	0.38-0.43	0.80-1.10	0.15-0.25	0.15-0.35	0.75-1.00	0.035	0.04	—	—
ENISO	42CrMo4	0.38-0.45	0.90-1.20	0.15-0.30	≤0.40	0.60-0.90	0.035	0.035	—

Grade	aisi4140 astm4140 sae4140 42CrMo,1.7225,scm440,42CrMo4
Processing	EAF+LF+VD
Commodity	steel round bar/round steel bar/round bar steel
Technique	hot rolled
Diameter	10-310mm
Length	canbe required to 3-12m
Sizes tolerance	length: +/-100mm,straightless:3mm/m
Application	1) General service industries (petroleum, food, chemical, paper, fertilizer, Fabric, aviation and nuclear) 2) Fluid, gas and oil transport 3) Pressure and heat transmission 4) Construction and ornament 5) Boiler heat exchangers
Advantages of this material	1) High fatigue strength and impact resistance after tempering 2) Good low-temperature impact toughness 3) No obvious temper brittleness
Quality Condition	1): Straightness: 3mm/m (max) 2): Corner Radius: 3(max) 3): The ends will be end cut or gas cut 4): No cracks on the surface
Packing	1): Paint oil on the surface to protect steel bars from rusting. 2): Bundle packing by Iron Strips. 3): Bundle weight is from 2mt to 3 mt. 4): Two or three tags will be attached on each bundle.
MOQ	5 tons for each sizes

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: Can steel round bars be coated for improved aesthetics?: Indeed, steel round bars have the potential to be coated for enhanced aesthetics. By applying a coating to steel round bars, their appearance can be elevated, resulting in a sleeker and more visually pleasing surface. Multiple coating alternatives, such as powder coating, electroplating, or painting, can be utilized to achieve diverse aesthetic outcomes when coating steel round bars. Moreover, these coatings offer more than just an improved appearance; they also grant additional advantages like increased resistance to corrosion and heightened durability. As a result, the practice of coating steel round bars is widely employed across various domains, including architecture, decoration, and industry, to enhance their aesthetics.

Q: How do steel round bars compare to ceramic round bars?: Steel round bars are generally stronger and more durable compared to ceramic round bars. Steel has a higher tensile strength and can withstand higher temperatures, making it suitable for heavy-duty applications. On the other hand, ceramic round bars are generally lighter, offer better corrosion resistance, and have higher electrical insulation properties. The choice between steel and ceramic round bars depends on the specific application requirements and desired properties.

Q: Can steel round bars be used in the manufacturing of springs?: Yes, steel round bars can be used in the manufacturing of springs. Steel is a common material used in spring manufacturing due to its excellent properties such as high strength, durability, and flexibility. Steel round bars can be shaped and formed into the desired spring shape using various manufacturing processes like hot rolling, cold drawing, or machining. The specific type of steel round bar used will depend on the application and desired characteristics of the spring, such as the level of stiffness or resistance required. Overall, steel round bars are a widely used and reliable choice for the manufacturing of springs.

Q: What is the maximum manganese content allowed for steel round bars?: The permissible manganese content for steel round bars may differ based on the grade or standard being adhered to. Generally, the manganese content in steel round bars is typically restricted to a maximum of approximately 1.65% by weight. This limitation is due to the adverse effects that higher manganese levels can have on the mechanical properties and weldability of the steel. Nevertheless, it is crucial to acknowledge that various industries or applications may establish their own specific requirements or allowances for manganese content in steel round bars. Hence, it is always advisable to refer to the relevant specifications or standards to ascertain the maximum manganese content permissible for a specific grade of steel round bars.

Q: What are the different grades of heat-treated steel round bars?: The different grades of heat-treated steel round bars include, but are not limited to, AISI 4140, AISI 4340, AISI 8620, and ASTM A105.

Q: What are the tolerance levels for steel round bars?: The tolerance levels for steel round bars can vary depending on the specific requirements and industry standards. Generally, the tolerance levels for diameter can range from +/- 0.001 inches to +/- 0.005 inches, while the tolerance levels for length can range from +/- 0.125 inches to +/- 0.250 inches. It is important to refer to the relevant specifications or consult with a manufacturer to determine the specific tolerance levels for a particular steel round bar.

Q: What are the advantages of using high-strength steel round bars?: There are several advantages to using high-strength steel round bars in various applications. Firstly, high-strength steel round bars are known for their exceptional strength-to-weight ratio. This means that even though these bars are lighter in weight compared to other materials, they possess a significantly higher strength. This advantage allows for the construction of structures that are both sturdy and lightweight, making them ideal for applications where weight reduction is crucial, such as in the aerospace and automotive industries. Secondly, high-strength steel round bars offer excellent resistance to wear, fatigue, and impact. This characteristic makes them highly durable and able to withstand heavy loads and repeated stress, enhancing the overall lifespan and performance of structures or components made from these bars. This advantage is particularly beneficial in applications such as construction, where the materials are subjected to extreme conditions and must maintain their structural integrity over time. Furthermore, high-strength steel round bars provide improved design flexibility due to their versatility. They can be easily shaped, machined, and welded, allowing for the creation of complex and customized structures or components. This advantage enables engineers and designers to optimize their designs and achieve specific performance requirements, resulting in more efficient and innovative solutions. In addition, high-strength steel round bars offer enhanced resistance to corrosion, making them suitable for applications where exposure to harsh environmental conditions or corrosive substances is a concern. By utilizing high-strength steel round bars, structures or components can maintain their integrity and functionality for extended periods, reducing the need for frequent maintenance and replacement. Finally, using high-strength steel round bars can lead to cost savings in the long run. Although the initial cost of these bars might be higher compared to other materials, their superior strength and durability can significantly reduce maintenance, repair, and replacement costs over time. Additionally, the lightweight nature of high-strength steel round bars can contribute to fuel efficiency, resulting in cost savings in transportation and other industries. Overall, the advantages of using high-strength steel round bars include high strength-to-weight ratio, excellent resistance to wear and fatigue, improved design flexibility, enhanced corrosion resistance, and potential cost savings. These benefits make high-strength steel round bars a preferred choice for a wide range of applications, ranging from construction and manufacturing to transportation and infrastructure.

Q: How can steel round bars be protected from corrosion?: Steel round bars can be protected from corrosion through various methods. One of the most common ways is by applying a protective coating such as paint or enamel. This coating acts as a barrier between the steel and the corrosive elements in the environment, preventing direct contact and reducing the chances of corrosion. Another effective method is through the use of galvanization. This involves coating the steel round bars with a layer of zinc. Zinc is a sacrificial metal, which means it corrodes more easily than steel. So, when the round bars are exposed to moisture or other corrosive substances, the zinc coating will corrode instead of the steel, providing an added layer of protection. Using stainless steel round bars is also a great way to prevent corrosion. Stainless steel contains a significant amount of chromium, which forms a passive layer on the surface of the steel. This passive layer acts as a shield, protecting the steel from corrosion caused by moisture or other corrosive agents. Regular maintenance and cleaning of the steel round bars is crucial in preventing corrosion. Removing dirt, dust, and other contaminants from the surface helps to maintain the protective coating or passive layer, if present. Additionally, keeping the round bars dry and storing them in a well-ventilated area can also help prevent corrosion. Lastly, proper handling and storage of steel round bars are important. They should be stored in a dry and covered area to prevent exposure to moisture and corrosive elements. Avoiding contact with other metals or materials that can cause galvanic corrosion is also essential. By implementing these protective measures, steel round bars can be effectively shielded from corrosion, ensuring their longevity and structural integrity.

Q: What are the advantages of using heat-treatable steel round bars?: There are several advantages of using heat-treatable steel round bars: 1. Increased strength: Heat-treatable steel round bars can be subjected to controlled heating and cooling processes, which enhances their strength and hardness. This makes them suitable for applications that require high strength and durability. 2. Improved wear resistance: Through heat treatment, the steel round bars can develop a hardened surface layer, which significantly improves their resistance to wear and abrasion. This makes them ideal for use in industries such as manufacturing, construction, and automotive, where components are subjected to heavy wear and tear. 3. Customizability: Heat-treatable steel round bars offer the advantage of being easily customizable to meet specific requirements. By adjusting the heat treatment process, the hardness, strength, and other mechanical properties of the bars can be tailored to suit different applications, ensuring optimal performance. 4. Machinability: Heat-treatable steel round bars typically have good machinability, which means they can be easily cut, drilled, or shaped into various forms without compromising their structural integrity. This makes them convenient to work with, reducing production time and costs. 5. Versatility: Heat-treatable steel round bars are highly versatile and find applications in a wide range of industries, including construction, manufacturing, oil and gas, automotive, and aerospace. They are commonly used in the production of shafts, gears, bolts, axles, and other critical components. 6. Cost-effectiveness: While heat-treatable steel round bars may have a higher initial cost compared to non-heat-treatable or lower-grade steels, their durability and enhanced properties make them cost-effective in the long run. The improved strength and wear resistance lead to longer service life, reducing the need for frequent replacements and maintenance. Overall, the advantages of using heat-treatable steel round bars include increased strength, improved wear resistance, customizability, good machinability, versatility, and cost-effectiveness. These benefits make them a preferred choice for demanding applications that require high-performance materials.

Q: Can steel round bars be used in the manufacturing industry?: Yes, steel round bars are commonly used in the manufacturing industry for various applications such as machinery, construction, automotive, and aerospace. They are known for their strength, durability, and versatility, making them an ideal material for manufacturing components, tools, and structures.

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