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: What are the different types of steel round bar coatings used in the oil and gas industry?: There are several types of steel round bar coatings commonly used in the oil and gas industry. Some of these coatings include fusion bonded epoxy (FBE), three-layer polyethylene (3LPE), three-layer polypropylene (3LPP), and metallic zinc coatings. These coatings are applied to steel round bars to provide corrosion resistance, enhance durability, and protect against harsh environmental conditions in oil and gas applications.

Q: Are steel round bars suitable for plumbing applications?: Steel round bars are indeed a suitable option for plumbing applications due to their durability and strength. This material is particularly well-suited for plumbing systems that necessitate high pressure and load-bearing capabilities. Plumbing components like pipes, fittings, valves, and supports can all be crafted from steel round bars. Its resistance to corrosion and long-lasting nature make it a popular choice in water supply systems, underground piping, and industrial plumbing. Nevertheless, it is crucial to carefully consider the specific requirements of each plumbing application, including factors like water quality, temperature, and compatibility with other materials. Furthermore, the proper installation and maintenance of steel round bars are essential for ensuring their effectiveness and longevity in plumbing systems.

Q: What are the different grades of stainless steel round bars?: Stainless steel round bars are available in various grades, each offering unique properties and characteristics. The most common grades of stainless steel round bars include: 1. Grade 304: This is the most widely used grade of stainless steel round bars. It offers good corrosion resistance, high durability, and excellent formability. Grade 304 is suitable for a wide range of applications, including food processing equipment, kitchen appliances, and architectural components. 2. Grade 316: Known for its superior corrosion resistance, grade 316 stainless steel round bars are often used in marine environments or industries where exposure to corrosive substances is common. It also offers excellent resistance to high temperatures, making it suitable for heat exchangers and chemical processing equipment. 3. Grade 410: This stainless steel grade is known for its high strength and hardness. Grade 410 round bars are often used in applications where resistance to corrosion and moderate heat is required, such as cutlery, pump shafts, and valve parts. 4. Grade 420: With increased carbon content, grade 420 stainless steel round bars offer higher strength and hardness compared to grade 410. It is commonly used in the production of surgical instruments, dental tools, and blades. 5. Grade 430: This grade of stainless steel round bars is known for its good corrosion resistance and formability. It is often used in applications involving decorative trim, automotive components, and kitchen appliances. These are just a few examples of the different grades of stainless steel round bars. It is important to choose the appropriate grade based on the specific requirements of your application to ensure optimal performance and longevity.

Q: What is the difference between a centerless ground and a polished steel round bar?: Both a centerless ground steel round bar and a polished steel round bar are types of steel bars that have undergone different finishing processes, resulting in unique qualities and characteristics. To produce a centerless ground steel round bar, the surface of the steel bar is ground using a specialized machine called a centerless grinder. This process effectively eliminates any imperfections or irregularities on the surface, resulting in a smooth and uniform finish. Additionally, the centerless grinding process ensures that the diameter of the bar remains consistent throughout its length. As a result, centerless ground steel round bars are ideal for applications that require precise dimensions and a smooth surface, such as machining operations or as a base material for further processing. On the contrary, a polished steel round bar is achieved through a polishing process, in which the surface of the steel bar is buffed and polished using abrasive materials. This process enhances the aesthetic appearance of the steel bar, giving it a shiny and reflective surface. Unlike centerless grinding, polishing does not involve the removal of material from the surface, but rather focuses on smoothing and refining it. As a result, polished steel round bars are commonly used in decorative applications, such as architecture, interior design, or as components in high-end furniture. In conclusion, the main distinction between a centerless ground steel round bar and a polished steel round bar lies in the finishing process. Centerless grinding focuses on achieving precise dimensions and a smooth surface, making it suitable for functional applications. On the other hand, polishing aims to enhance the visual appeal of the steel bar, making it more suitable for decorative purposes.

Q: Can steel round bars be bent or formed?: Yes, steel round bars can be bent or formed. The ability of steel round bars to be bent or formed depends on various factors such as the type of steel, the diameter and thickness of the bar, and the method used for bending or forming. Steel round bars can be bent or formed using different techniques, including hot bending, cold bending, and mechanical bending. Hot bending involves heating the steel round bar to a specific temperature and then bending it into the desired shape. Cold bending, on the other hand, does not require heating and can be done using hydraulic or manual bending machines. Mechanical bending involves the use of specialized machinery to apply force and bend the steel round bar. However, it is important to note that excessive bending or forming can weaken the steel round bar and affect its structural integrity. Therefore, it is crucial to follow proper bending and forming techniques and consider the limitations and specifications provided by the manufacturer or industry standards.

Q: Can steel round bars be used for making bicycle frames or handlebars?: Bicycle frames and handlebars can be made using steel round bars. Steel is widely used in bike manufacturing because it is strong, durable, and affordable. Round bars made of steel provide excellent rigidity and stability, which are crucial for maintaining the structural integrity of a bike frame or handlebars. Moreover, steel has high tensile strength, enabling it to withstand the pressures and strains encountered during cycling. It is important to note that different types of steel, like chromoly steel, may be preferred for bike frames and handlebars due to their specific advantages, such as improved strength-to-weight ratio. However, in general, steel round bars are a suitable option for constructing bicycle frames and handlebars.

Q: What is the difference between a rough turned and a centerless ground steel round bar?: A rough turned steel round bar is a type of steel bar that has been partially machined to remove excess material and create a rough surface finish. It undergoes a turning process on a lathe, which removes the outer layer of the steel bar to achieve a specific diameter and shape. On the other hand, a centerless ground steel round bar is a type of steel bar that has undergone a precise grinding process to achieve a smooth and polished finish. This process involves feeding the steel bar through a centerless grinder, which removes any imperfections or irregularities on the outer surface, resulting in a consistently smooth and uniform diameter. In summary, the main difference between a rough turned and a centerless ground steel round bar lies in the level of surface finish and precision. Rough turned bars have a rougher surface finish and are not as precisely sized as centerless ground bars, which have a smooth, polished finish and are manufactured with tighter tolerances.

Q: Why do I use the M25 round bar for the embedded bolt M24?: Because M25 round steel machine processing, the direct use of M24 round steel accuracy is not guaranteed

Q: What are the advantages of using nickel-copper alloy steel round bars?: Nickel-copper alloy steel round bars offer several advantages. Firstly, their resistance to corrosion and oxidation is excellent, making them ideal for use in harsh environments like the marine or chemical industries. This ensures the longevity and durability of the bars, reducing the need for frequent replacements. Secondly, these round bars have outstanding mechanical properties. The addition of nickel and copper enhances their strength, toughness, and hardness, making them suitable for heavy-duty applications in construction, manufacturing, and engineering. They can withstand heavy loads and resist deformation or breakage, contributing to the overall safety and reliability of the structures or components they are used in. Another advantage is their excellent thermal stability. The alloy has a low coefficient of thermal expansion, allowing it to withstand high temperatures without significant dimensional changes. This is particularly important in applications involving extreme heat, such as in the aerospace or power generation industries. The thermal stability of the bars ensures their dimensional integrity, reducing the risk of warping or cracking under high-temperature conditions. Furthermore, Nickel-copper alloy steel round bars offer good electrical conductivity. This is beneficial in applications that require the transmission of electric current, such as electrical wiring or power distribution systems. The high electrical conductivity of the alloy ensures efficient and reliable electrical connections, minimizing power loss and maximizing performance. In conclusion, the advantages of nickel-copper alloy steel round bars include excellent corrosion resistance, superior mechanical properties, thermal stability, and good electrical conductivity. These characteristics make them suitable for a wide range of applications in various industries, providing durability, strength, and reliability.

Q: What are the tolerances for steel round bars?: The tolerances of steel round bars can differ based on the specific requirements of the application and manufacturing process. Generally, steel round bars have specified tolerances for diameter, straightness, and length. For diameter tolerance, it is usual to find tolerances ranging from +/- 0.001 inches to +/- 0.005 inches. This means that the actual diameter of the steel round bar can deviate within this range from the specified diameter. The size and grade of the bar determine the specific tolerance. Straightness tolerance refers to the permissible deviation in the straightness of the bar. Typically, it is specified as a maximum deviation per unit length, such as 0.125 inches per foot. This ensures that the bar remains straight and within acceptable limits when measured along its length. Length tolerance determines the allowable variation in the overall length of the round bar. It can range from +/- 0.125 inches to +/- 0.5 inches, depending on the size and grade of the bar. This ensures that the bar meets the required length specifications. It is important to note that these tolerances can vary based on industry standards, customer specifications, and the manufacturing method employed. Moreover, certain applications may have stricter tolerance requirements, particularly in industries like aerospace or automotive where precision is crucial. To summarize, the tolerances for steel round bars encompass diameter, straightness, and length. The specific tolerances depend on the size, grade, and application of the round bar, as well as any relevant industry standards or customer specifications.

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