• 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 System 5
  • AISI 4340 Forged Round Steel Bars System 6
AISI 4340 Forged Round Steel Bars

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 Round Steel Bars                 

                       

Products Details 

aisi 4340 forged steel round bars
Comparative standardGradeCSiMnCrMoVWPSNi
GB40CrNiMoA0.36-0.440.10-0.3500.45-0.701.10-1.400.20-0.35

0.030.021.30-1.7
AISI4337/4340









JISSNCM8









DIN34CrNiMo6/1.65820.34max 0.400.651.500.23

0.030.031.50
Dimensions
Round bar
Dia:10mm~700mmLength:2m~6m
Flat bar
Thickness:10mm~500mmLength:2m~12m
*Dimensions can be customized
Heat Treatment
Normalizing850-880°C-
Stress Relieving650°Cair cooling
Quenching830-860°Coil quenching
Tempering540-660°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
ProcessEAF+LF+VD+Forging+(Rolling)+Annealing Condition (optional)
Delivery ConditionHot forged+Rough machined/turned surface
MOQ1 ton
Technical DataAccording to customer’s requirements of chemical composition, physical properties and mechanical testing
Ultrasonic TestUltrasonic 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 DocumentsContract, Debit Note, PI(Performa Invoice)
Shipping DocumentsB/L(Bill of Loading), Packing List, Shipping list, CI(Commercial Invoice)
CertificationsSGS, ISO9001-2008, UT(Ultrasonic Test), CO(Certificate of Original), MTC(Milling Test Certificate)

 

Products Show 

 


Product Overviews 

Product NameTypical GradesDiameter(mm)Standard adopted
Carbon Steel20 (1020/S20C/C22)Ø16-Ø300

 

 

GB/SAE/JIS/DIN

 

40 (1040/S40C/C40)
45 (1045/S45C/C45)
Bearing SteelGCr9 (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 Steel20CrNiMoØ16-Ø600
20CrMn(5115/SMnC420/20MnCr5)
20CrNiMo(8620/SNCM220/20CrMiMo2)


Application 

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 


Work Shop 

 AISI 4340 Forged Round Steel Bars


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:Do you need paint for roof lightning proof steel bars?
If the metal surface is coated with a thick layer of insulating paint, it will seriously affect the flashover effect. In the national standard, the metal roof is directly used as a flash receiver. The thickness of the paint used on the roof must be less than the required value. That is what it means.
Q:What is the maximum molybdenum content allowed for steel round bars?
The maximum molybdenum content allowed for steel round bars varies depending on the grade and specific requirements of the steel. Generally, the maximum molybdenum content for standard carbon and alloy steels is around 0.25-0.30%. However, for high-performance steels such as tool steels or stainless steels, the maximum molybdenum content can be higher, ranging from 1-10%, depending on the specific grade and application. It is crucial to consult the relevant industry standards, specifications, or material data sheets to determine the precise maximum molybdenum content allowed for a specific steel round bar.
Q:What are the standard sizes of steel round bars?
The standard sizes of steel round bars vary depending on the country and the specific industry standards. In general, steel round bars are available in a wide range of diameters, typically ranging from 6mm (0.24 inches) to 400mm (15.75 inches) or even larger. Commonly used sizes for commercial applications include 10mm (0.39 inches), 12mm (0.47 inches), 16mm (0.63 inches), 20mm (0.79 inches), 25mm (0.98 inches), and 32mm (1.26 inches). However, it is important to note that these sizes may differ in different regions and industries, and specialized applications may require unique dimensions. It is always recommended to consult the relevant industry standards or consult with suppliers to determine the specific standard sizes for steel round bars in a particular context.
Q:Are steel round bars resistant to UV radiation?
No, steel round bars are not inherently resistant to UV radiation.
Q:How do steel round bars compare to other materials like aluminum or stainless steel?
Steel round bars have several advantages over other materials like aluminum or stainless steel. Firstly, steel round bars are known for their exceptional strength and durability. They have a high tensile strength, making them capable of withstanding heavy loads and extreme conditions. This makes them ideal for applications where strength and resilience are crucial, such as construction, manufacturing, and engineering. Compared to aluminum, steel round bars offer superior strength and hardness. While aluminum is lightweight, it is not as strong as steel, which can be a limiting factor in certain applications. Steel round bars also have a higher resistance to impact and abrasion, making them more suitable for heavy-duty applications that require resistance to wear and tear. In terms of comparing steel round bars to stainless steel, it's important to note that stainless steel is an alloy that contains steel as its main component. Stainless steel is known for its corrosion resistance, making it an excellent choice for applications where exposure to moisture or harsh environments is a concern. However, stainless steel does not possess the same level of strength as steel round bars. Steel round bars are capable of carrying heavier loads and providing better structural integrity. Another aspect to consider is the cost-effectiveness of steel round bars compared to aluminum or stainless steel. Steel is generally more affordable than stainless steel and aluminum, making it a popular choice for a wide range of applications. Additionally, steel round bars are readily available in various sizes and grades, offering versatility and ease of use. Overall, steel round bars excel in terms of strength, durability, and cost-effectiveness when compared to other materials like aluminum or stainless steel. However, the choice of material ultimately depends on the specific requirements of the application and the desired properties needed for the project.
Q:How do you calculate the weight of a steel round bar based on its length and volume?
In order to determine the weight of a steel round bar based on its length and volume, it is necessary to have knowledge of the steel's density. The density denotes the mass per unit volume of the material. The weight can be calculated using the following formula: Weight = Volume × Density To begin, one must calculate the volume of the steel round bar. The volume of a cylinder, which is the shape of a round bar, can be determined using the following formula: Volume = π × (Radius)^2 × Length The value of π is a mathematical constant approximately equal to 3.14, and Radius represents the radius of the round bar. Once the volume is obtained, it can be multiplied by the density of the steel to find the weight. It is important to note that the density of steel may vary depending on the specific type being used. For instance, mild steel has a density of approximately 7850 kg/m³. Therefore, the weight of the steel round bar can be calculated as: Weight = Volume × Density For example, let us consider a steel round bar with a length of 1 meter and a radius of 0.5 meters. To calculate the weight, we first need to determine the volume: Volume = π × (0.5)^2 × 1 Volume = 0.7854 m³ Next, we multiply the volume by the density of steel: Weight = 0.7854 m³ × 7850 kg/m³ Weight = 6171.79 kg Hence, the weight of the steel round bar would be approximately 6171.79 kg.
Q:What are the different grades of alloy steel round bars for automotive applications?
There are several different grades of alloy steel round bars used for automotive applications, including 4140, 4340, and 8620. These grades offer varying levels of strength, toughness, and wear resistance, allowing them to be used in different automotive components such as shafts, gears, and axles. The choice of grade depends on the specific requirements of the application, taking into consideration factors like load capacity, durability, and cost.
Q:What are the advantages of using nickel-lead alloy steel round bars?
Nickel-lead alloy steel round bars offer numerous benefits: 1. Corrosion resistance is enhanced, making the bars suitable for use in industries dealing with harsh environments or corrosive substances. This ensures durability and reduces the need for frequent replacements. 2. The inclusion of nickel and lead enhances the strength and toughness of the bars, making them highly resistant to deformation, cracking, and wear under high-stress conditions. This allows them to withstand heavy loads and impacts. 3. Machinability is improved, enabling easy cutting, drilling, and shaping during fabrication processes. Efficient chip evacuation and reduced tool wear result in increased productivity and cost-effectiveness in manufacturing. 4. Thermal stability is excellent, making the bars suitable for high-temperature applications or extreme thermal cycling. They can withstand thermal expansion and contraction without significant dimensional changes, ensuring accuracy and structural integrity. 5. The addition of lead contributes to a low coefficient of friction, reducing wear and friction between the bars and other surfaces. This is valuable in applications where minimal wear and lubrication are crucial. 6. The bars possess good electrical conductivity, making them ideal for applications that require efficient electrical current flow, such as electrical connectors and circuit breakers. In conclusion, nickel-lead alloy steel round bars offer enhanced corrosion resistance, superior strength, improved machinability, thermal stability, low friction coefficient, and good electrical conductivity. These properties make them an excellent choice for various industries and applications.
Q:What are the advantages of using tool steel round bars?
Tool steel round bars offer several advantages: 1. High hardness: Tool steel round bars have exceptional hardness, making them ideal for applications that require resistance to wear, abrasion, and deformation. This property ensures longevity and durability of the tool. 2. Excellent machinability: Tool steel round bars are known for their excellent machinability, meaning they can be easily shaped, cut, and formed into various tool designs. This enhances the versatility and precision of the tool. 3. Superior strength and toughness: Tool steel round bars possess exceptional strength and toughness, enabling them to withstand high impact and shock loading. This makes them suitable for heavy-duty applications where tools are subjected to intense pressure and stress. 4. Good heat resistance: Tool steel round bars exhibit excellent heat resistance, allowing them to retain their hardness and strength even at high temperatures. This characteristic is crucial for tools used in applications involving heat treatment, forging, and molding. 5. Corrosion resistance: Many tool steel alloys contain elements such as chromium, vanadium, and molybdenum, which enhance their corrosion resistance. This makes tool steel round bars suitable for applications in corrosive environments, ensuring longevity and performance. 6. Precise dimensional accuracy: Tool steel round bars are manufactured to precise dimensional tolerances, ensuring uniformity and consistency in their shape and size. This level of accuracy is crucial for ensuring the proper fit and functionality of the tool. Overall, the advantages of using tool steel round bars lie in their hardness, machinability, strength, heat resistance, corrosion resistance, and dimensional accuracy, making them a preferred choice for various tooling applications.
Q:What are the advantages of using niobium-alloy steel round bars?
Niobium-alloy steel round bars offer numerous benefits. Firstly, they possess exceptional strength and toughness. By incorporating niobium, the steel's strength increases while maintaining its ductility, making it ideal for applications requiring durability and high strength. Consequently, these round bars can withstand heavy loads and shocks without deforming or breaking easily. Secondly, niobium-alloy steel exhibits high resistance to corrosion. Consequently, it proves suitable for use in harsh environments where exposure to moisture, chemicals, or corrosive substances is common. The corrosion resistance ensures that the round bars remain intact and retain their structural integrity over time, reducing the need for frequent replacements and maintenance. Moreover, niobium-alloy steel demonstrates excellent weldability and formability. It can be effortlessly welded and fabricated into various shapes and sizes, making it adaptable to different manufacturing processes and applications. This adaptability enables the production of custom-designed round bars that meet specific project requirements. Additionally, niobium-alloy steel possesses superior heat resistance properties. It can endure high temperatures without losing strength or experiencing significant changes in its mechanical properties. Thus, it proves suitable for applications involving exposure to extreme heat or thermal cycling, such as in the aerospace or automotive industries. Furthermore, niobium-alloy steel is renowned for its exceptional fatigue resistance. It possesses a high endurance limit, enabling it to withstand repeated loading and unloading cycles without experiencing fatigue failure. This quality makes niobium-alloy steel round bars ideal for applications involving dynamic or cyclic loading, such as in structural components or machinery. In conclusion, the utilization of niobium-alloy steel round bars grants advantages such as high strength, corrosion resistance, weldability, formability, heat resistance, and fatigue resistance. These properties make niobium-alloy steel a reliable and cost-effective choice for numerous industries and applications.

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