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:Can steel round bars be used for making camshafts?: Camshafts can indeed be made using steel round bars. In fact, steel is a widely used material for camshaft production because of its exceptional strength, durability, and resistance to wear and fatigue. By machining and shaping steel round bars, they can be transformed into the desired profile, which makes them ideal for manufacturing camshafts. These camshafts are crucial components in internal combustion engines. The specific type of steel chosen will depend on the application and performance requirements. Typically, alloy steels or carbon steels with superior mechanical properties are used. In summary, steel round bars provide a reliable and cost-effective option for producing camshafts that can endure the demanding conditions of engine operation.

Q:What are the advantages of using bearing steel round bars?: Bearing steel round bars offer numerous benefits: 1. They possess remarkable strength and durability, making them ideal for applications that demand a robust and dependable material capable of withstanding heavy loads and high impact forces. 2. Their exceptional wear resistance allows them to endure constant friction and abrasion without experiencing excessive wear and tear. As a result, they are suitable for applications that involve repetitive rotational motion or sliding. 3. Bearing steel round bars are typically heat-treated to attain optimal hardness levels. This hardness enables them to maintain their shape and structural integrity even under extreme conditions like high temperatures or heavy loads. 4. These round bars exhibit excellent dimensional stability, meaning they retain their shape and size even when subjected to varying temperature and environmental conditions. This quality is essential in applications that require precise dimensions for proper functioning and performance. 5. Bearing steel round bars are often alloyed with elements like chromium and molybdenum to enhance their corrosion resistance. Consequently, they are well-suited for use in corrosive environments, such as the marine or chemical industries. 6. They are relatively easy to machine and process, allowing for efficient production and customization. This ease of shaping, cutting, and drilling makes them a cost-effective choice for various applications. In summary, bearing steel round bars offer high strength, excellent wear resistance, superior hardness, dimensional stability, corrosion resistance, and machinability. These qualities make them the preferred choice in industries such as automotive, aerospace, machinery, and construction, where reliability, durability, and performance are of utmost importance.

Q:Can steel round bars be used for making gates?: Yes, steel round bars can be used for making gates. Steel round bars are strong and durable, making them suitable for gate construction. They can be welded together to create a sturdy gate frame, and can also be used for decorative elements or as pickets. Additionally, steel round bars can be easily customized and shaped to fit the desired gate design.

Q:How do you prevent corrosion on steel round bars?: To prevent corrosion on steel round bars, there are several effective methods that can be employed: 1. Coating: Applying a protective coating on the steel round bars is a common way to prevent corrosion. Coatings like paint or epoxy can act as a barrier between the steel and the external environment, preventing moisture and corrosive substances from coming into contact with the metal. 2. Galvanization: Galvanizing the steel round bars involves applying a layer of zinc on the surface. This zinc layer acts as a sacrificial anode, corroding in place of the steel if any damage occurs. This method is particularly effective in preventing corrosion in outdoor or marine environments. 3. Stainless steel: Using stainless steel round bars that contain a high percentage of chromium and nickel is another effective corrosion prevention method. The presence of these elements forms a passive, protective film on the surface of the steel, which acts as a barrier against corrosion. 4. Proper storage: Storing steel round bars in a dry and well-ventilated area can help prevent corrosion. Moisture, especially in humid environments, can accelerate the corrosion process. Therefore, it is crucial to keep the round bars away from direct contact with water or any other corrosive substances. 5. Regular maintenance: Regularly inspecting the steel round bars for signs of corrosion and promptly addressing any issues can prevent further damage. This may involve cleaning the bars using appropriate methods and applying protective coatings as necessary. By implementing these preventive measures, corrosion on steel round bars can be significantly reduced, ensuring their longevity and maintaining their structural integrity.

Q:The problem of dowel bars on concrete pavements?: The left and right half of the casting, the middle of the set is a longitudinal pull rod, tie rod settings and your panel thickness and plate width, length of the boardTo Portland cement concrete surface layer as an example: when the plate is 3M, the thickness of the surface layer is 200-250mm, the rod Phi 14 * 700mm * 900mm rebar length and spacing from the lateral transverse joint distance not less than 10mm (mean distance is a piece of plate length is 4 meters to the two plates the net is not small 100mm).

Q:What is the difference between a rough turned and a precision ground steel round bar?: A rough turned steel round bar is a raw material that has undergone minimal machining, leaving a slightly rough surface finish. It is typically used for applications where a high level of precision is not required, such as structural components. On the other hand, a precision ground steel round bar is a finished product that has undergone precise machining to achieve a smooth and accurate surface finish. This process ensures tight dimensional tolerances and a consistent diameter throughout the length of the bar. Precision ground bars are commonly used in applications that require close dimensional control and a high level of accuracy, such as in machinery and tooling.

Q:How can steel round bars be protected from corrosion?: There are various methods available for protecting steel round bars from corrosion. One common approach involves the application of a protective coating, such as paint or enamel. This coating acts as a barrier between the steel and the corrosive elements present in the environment, thereby minimizing the risk of corrosion. Another effective technique is the use of galvanization, which entails coating the steel round bars with a layer of zinc. Zinc, being a sacrificial metal, tends to corrode more readily than steel. Consequently, when the round bars come into contact with moisture or other corrosive substances, the zinc coating corrodes instead of the steel, providing an extra layer of protection. The utilization of stainless steel round bars is also highly effective in preventing corrosion. Stainless steel contains a significant amount of chromium, which forms a passive layer on the steel's surface. This passive layer acts as a shield, safeguarding the steel against corrosion caused by moisture or other corrosive agents. Regular maintenance and cleaning of the steel round bars are essential for preventing corrosion. Removing dirt, dust, and other contaminants from the surface helps to preserve the protective coating or passive layer if it exists. Additionally, keeping the round bars dry and storing them in a well-ventilated area can also aid in corrosion prevention. Proper handling and storage of steel round bars are equally important. Storing them in a dry and covered location prevents exposure to moisture and corrosive elements. It is also crucial to avoid contact with other metals or materials that can induce galvanic corrosion. By implementing these protective measures, steel round bars can be effectively shielded from corrosion, ensuring their longevity and structural integrity.

Q:Can steel round bars be bent or formed into shapes?: Steel round bars possess the ability to undergo bending or shaping into different forms. Due to its exceptional strength and durability, steel is widely recognized as a versatile material suitable for various purposes. To achieve the desired shapes, steel round bars can be bent or formed using diverse techniques such as heating, hammering, or utilizing specialized machinery like hydraulic presses or roll benders. These methods enable the steel bars to be molded into curves, angles, or specific configurations in order to meet the desired requirements. However, it is important to acknowledge that the flexibility of a steel round bar to undergo bending or shaping is contingent upon factors including its diameter, type of steel, and the specific technique employed for bending or forming.

Q:What are the different types of steel round bar surface finishes for improved aesthetics?: Some common types of steel round bar surface finishes for improved aesthetics include polished, brushed, satin, and bead blasted finishes.

Q:Can steel round bars be used in the manufacturing of garden tools?: Yes, steel round bars can definitely be used in the manufacturing of garden tools. Steel is a versatile and durable material that is commonly used in the production of various tools, including garden tools. Steel round bars can be shaped and formed into different types of garden tools such as shovels, rakes, hoes, and pruning shears. The strength and resistance of steel make it suitable for withstanding the rigors of outdoor use, including digging, cutting, and scraping. Additionally, steel can be easily sharpened and maintained, ensuring that the garden tools remain efficient and long-lasting.

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