AISI 4340 Forged Round Steel Bars System 1

AISI 4340 Forged Round Steel Bars System 2

AISI 4340 Forged Round Steel Bars System 3

AISI 4340 Forged Round Steel Bars System 4

AISI 4340 Forged Round Steel 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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aisi 4340 forged steel round bars
Comparative standard	Grade	C	Si	Mn	Cr	Mo	V	W	P	S	Ni
GB	40CrNiMoA	0.36-0.44	0.10-0.350	0.45-0.70	1.10-1.40	0.20-0.35			0.03	0.02	1.30-1.7
AISI	4337/4340
JIS	SNCM8
DIN	34CrNiMo6/1.6582	0.34	max 0.40	0.65	1.50	0.23			0.03	0.03	1.50
Dimensions
Round bar
Dia:10mm~700mm	Length:2m~6m
Flat bar
Thickness:10mm~500mm	Length:2m~12m
*Dimensions can be customized
Heat Treatment
Normalizing	850-880°C	-
Stress Relieving	650°C	air cooling
Quenching	830-860°C	oil quenching
Tempering	540-660°C
1.Normalizing
Normalizing temperature : 850-880°C

2.Stress Relieving
Stress relieving to remove machining stresses should be carried out by heating to approx.650°C,
holding for 1-2 hours at heat,followed by air cooling .
This operation is performed to reduce distortion during heat treatment .

3.Hardening
Harden from a temperature of 830-860°C followed by oil quenching.
Quenching temperature in the end quench test is 850°C.

4.Tempering
tempering temperature: 540-660°C

Detail information
Process	EAF+LF+VD+Forging+(Rolling)+Annealing Condition (optional)
Delivery Condition	Hot forged+Rough machined/turned surface
MOQ	1 ton
Technical Data	According to customer’s requirements of chemical composition, physical properties and mechanical testing
Ultrasonic Test	Ultrasonic test according to SEP 1921-84 G3 D/d E/d
Applications
Hot extrusion dies, forging die forging hammer, forging press die, precision forging die well as aluminum, copper and alloys die-casting mold.
Relevant documents
Contract Documents	Contract, Debit Note, PI(Performa Invoice)
Shipping Documents	B/L(Bill of Loading), Packing List, Shipping list, CI(Commercial Invoice)
Certifications	SGS, ISO9001-2008, UT(Ultrasonic Test), CO(Certificate of Original), MTC(Milling Test Certificate)

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: Lightning protection earthing zinc plating flat iron and round steel welding method, need to flat iron wrapped in round steel outside welding?: Unwanted。 The round bar shall be welded directly on flat steel, requiring both sides of the round bar to be welded, and the length of lap welding shall be 6 times of the diameter of round steel.

Q: What is the cost of steel round bars?: The cost of steel round bars can vary depending on several factors such as the grade of steel, size of the bar, and the quantity being purchased. Generally, the price is determined by market conditions and can fluctuate over time. It is recommended to contact local steel suppliers or check online platforms that offer steel products to get the most accurate and up-to-date pricing information. Additionally, factors such as transportation and handling costs may also influence the final cost.

Q: What are the advantages of using magnesium-alloy steel round bars?: Using magnesium-alloy steel round bars offers several benefits: 1. They are lightweight, making them ideal for industries that require weight reduction, such as aerospace and automotive. 2. Despite being lightweight, they have a high strength-to-weight ratio, ensuring structural integrity under high loads. 3. They have excellent corrosion resistance, making them suitable for outdoor and marine applications. 4. They are known for their superior machinability, allowing for precise and complex component manufacturing. 5. They effectively dissipate heat, making them ideal for applications that require heat management. 6. They contribute to a more sustainable and environmentally friendly manufacturing process due to magnesium's recyclability. 7. While they may have a higher initial cost, their lightweight nature leads to cost savings in transportation and installation. Additionally, their corrosion resistance and durability reduce long-term maintenance and replacement costs. In conclusion, magnesium-alloy steel round bars offer advantages such as lightweight, high strength-to-weight ratio, corrosion resistance, machinability, heat dissipation, eco-friendliness, and cost-effectiveness. They are highly desirable for industries that prioritize weight reduction, performance, and durability.

Q: What are the different specifications for steel round bars?: Steel round bars can be described using various specifications, including diameter, length, tolerance, and grade. The diameter determines the bar's size and is typically measured at its widest point. Diameters range from 1/4 inch to 12 inches, with different increments available. The length refers to the overall size of the round bar from end to end. Standard lengths are between 10 and 20 feet, but custom lengths can be obtained. When determining the quantity needed for a project, the length is an important factor to consider. Tolerance is a specification that allows for deviation from the specified diameter or length. It ensures that the round bar meets the required dimensions and can be effectively used. Tolerance values are usually expressed as plus or minus values, such as +/- 0.005 inches. The grade of steel used in round bars is also specified, indicating the material's quality and strength. Common grades include carbon steel, alloy steel, stainless steel, and tool steel. Each grade has unique properties suitable for different applications based on desired strength, corrosion resistance, and machinability. Surface finish and heat treatment may also be specified depending on the intended use of the round bars. These additional specifications ensure that the steel meets the necessary requirements for specific applications in various industries, such as construction and manufacturing.

Q: What are the common alloying elements used in steel round bars?: Steel round bars commonly contain alloying elements such as carbon, manganese, silicon, sulfur, and phosphorus. Carbon, the most significant alloying element, is responsible for the steel's strength and hardness. It enhances overall performance, increasing durability and resistance to wear and tear. Manganese, another crucial element, improves hardenability and strength while reducing brittleness and increasing toughness. Silicon is added to enhance the steel's resistance to oxidation, while small amounts of sulfur and phosphorus improve machinability. These alloying elements collaborate to produce steel round bars with specific properties suitable for various applications in industries such as construction, automotive, and manufacturing.

Q: How are steel round bars used in the construction of stadiums and sports facilities?: Steel round bars are widely used in the construction of stadiums and sports facilities due to their strength, durability, and versatility. These bars are typically made from carbon steel and are available in various diameters and lengths to meet the specific needs of each project. One of the primary uses of steel round bars in stadium construction is for the reinforcement of concrete structures. These bars are often embedded within concrete columns, beams, and slabs to enhance their load-bearing capacity and overall structural integrity. The high tensile strength of steel allows it to withstand heavy loads and provide the necessary support for large seating areas, roofs, and other architectural elements. Steel round bars are also used in the construction of stadium roofs and canopies. These structures require a strong and lightweight material that can span long distances without the need for excessive support columns. Steel bars, when properly designed and installed, offer an ideal solution by providing the necessary strength while minimizing the number of support elements, thus allowing for unobstructed views and spacious seating arrangements. Additionally, steel round bars are commonly used in the fabrication of stadium fences, guardrails, and handrails. These components are crucial for ensuring the safety and security of spectators, preventing falls or accidents in elevated areas, and guiding the flow of people within the facility. The high tensile strength of steel provides the necessary resistance against impact, making it an ideal material for these applications. In summary, steel round bars play a crucial role in the construction of stadiums and sports facilities. Their strength, durability, and versatility make them a preferred choice for reinforcing concrete structures, constructing roofs and canopies, and fabricating safety components. By utilizing steel round bars, stadiums can be built to withstand heavy loads, provide unobstructed views, and ensure the safety of spectators, ultimately enhancing the overall experience for sports enthusiasts.

Q: How do you calculate the maximum allowable stress for a steel round bar?: To calculate the maximum allowable stress for a steel round bar, you need to determine the material's yield strength and apply a safety factor. The formula is: Maximum Allowable Stress = Yield Strength / Safety Factor. The safety factor typically depends on the application and industry standards.

Q: Can steel round bars be used for making brake components?: Yes, steel round bars can be used for making brake components. Steel is a commonly used material in brake systems due to its high strength, durability, and heat resistance properties. Steel round bars can be machined and shaped into various brake components such as brake discs, brake rotors, brake calipers, and brake pistons. The use of steel round bars ensures the brake components can withstand the high pressures and temperatures generated during braking, providing reliable and efficient stopping power.

Q: What is the difference between a hot rolled and a precision ground steel round bar?: The main difference between a hot rolled and a precision ground steel round bar is the manufacturing process and the resulting surface finish. Hot rolled steel round bars are made by heating a steel billet until it is soft enough to be formed into a round shape, then rolling it through a series of rollers to achieve the desired diameter. This process creates a rougher surface finish and can result in slight variations in diameter along the length of the bar. On the other hand, precision ground steel round bars are made by starting with a hot rolled bar and then subjecting it to additional grinding or machining processes to achieve a precise diameter and a smooth, consistent surface finish. This extra processing ensures that the bar has a more uniform size and a finer surface texture, making it suitable for applications that require tight tolerances and a polished appearance. Overall, the choice between a hot rolled and a precision ground steel round bar depends on the specific requirements of the application. Hot rolled bars are generally more cost-effective and suitable for less demanding applications, while precision ground bars are preferred for precision machining and high-performance applications.

Q: What are the different testing methods used for steel round bars?: There are several testing methods used for steel round bars to ensure their quality and suitability for various applications. These methods include: 1. Visual Inspection: This is the initial step of testing, where the bars are visually examined for any visible defects, such as cracks, surface irregularities, or improper dimensions. 2. Dimensional checks: Steel round bars undergo dimensional checks to verify their diameter, length, and straightness. Precise measurements are essential to meet the specified requirements. 3. Ultrasonic Testing: Ultrasonic waves are passed through the round bars to detect internal defects, such as cracks, voids, or inclusions. This method helps identify potential weaknesses that may affect the structural integrity of the bars. 4. Magnetic Particle Inspection: This method uses a magnetic field and magnetic particles to detect surface and near-surface defects like cracks, seams, or laps. It is particularly useful in ferromagnetic materials such as steel. 5. Dye Penetrant Inspection: This technique involves applying a colored dye to the surface of the round bars and then wiping it off. The dye penetrates into any surface cracks or defects, making them visible under ultraviolet light. 6. Hardness Testing: This test measures the hardness of the steel round bars using methods like Rockwell or Brinell scales. It helps determine the material's ability to withstand external forces and ensures it meets the required hardness specifications. 7. Tensile Testing: Tensile strength testing is conducted to measure the maximum load a steel round bar can bear before it breaks. This test helps evaluate the material's strength and ductility. 8. Chemical Analysis: Chemical analysis is performed to determine the composition of the steel round bars, including the presence of elements like carbon, manganese, sulfur, phosphorus, and others. It ensures that the steel meets the required chemical composition standards. These testing methods are crucial in ensuring the quality, reliability, and compliance of steel round bars with industry standards and customer requirements. It is essential to perform a combination of these tests to ensure the overall quality and performance of the steel round bars in different applications.

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