AISI 4340 Forged Steel Round Bars System 1

AISI 4340 Forged Steel Round Bars System 2

AISI 4340 Forged Steel Round Bars System 3

AISI 4340 Forged Steel Round Bars System 4

AISI 4340 Forged Steel Round 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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Chemical Composition	Mechanical Properties (In Quenched & Tempered State)
C	0.38-0.43 %	Tensile strength(MPA)	≥980(100)
Si	0.15-0.35 %	Yield strength (MPA)	≥835(85)
Mn	0.60-0.80 %	Elongation (δ5/%)	≥12
Cr	0.70-0.90 %	Reduction in Area (ψ/%)	≥55
Ni	1.65-2.00 %	Impact (J)	≥ 78
P	≤0.035 %	Impact toughness value αkv (J/cm2)	≥98(10)
S	≤0.040 %	Hardness	≤269HB
Mo	0.20-0.30 %

Standard	ASTM A29/A 29M-05
Grade	4340
MOQ	1 Metric Ton
Diameter	8mm~1500mm
Length	6m,12m or as required.
Diameter Tolerance	As required
Condition of delivery	Hot rolled,Cold Rolled or as required.

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:Are steel round bars suitable for machining?: Indeed, machining is a suitable application for steel round bars. Due to their remarkable machinability, steel round bars are frequently employed in diverse machining procedures. These bars can be effortlessly molded, sliced, bored, and rotated using various machining methods like milling, turning, drilling, and grinding. By offering commendable dimensional stability, exceptional strength, and outstanding wear resistance, steel round bars prove to be an ideal choice for machining operations. Moreover, the availability of different grades and alloys further expands the scope of machining applications in industries spanning automotive, aerospace, construction, and manufacturing.

Q:What are the different types of steel round bar surface finishes for improved cleanliness?: There are several types of steel round bar surface finishes that can help improve cleanliness. Some common finishes include hot rolled, cold drawn, turned and polished, and ground finishes. These finishes remove surface impurities and provide a smoother and cleaner surface, making the steel round bar more suitable for various applications.

Q:Can steel round bars be used in the manufacturing of valves?: Yes, steel round bars can be used in the manufacturing of valves. Steel round bars are commonly used as raw materials in valve manufacturing due to their durability, strength, and ability to withstand high pressure and temperature conditions.

Q:What is the impact strength of a steel round bar?: The impact strength of a steel round bar refers to its ability to withstand sudden forces or shocks without breaking or fracturing. It is a measure of the material's toughness and resistance to impact loads. The impact strength of a steel round bar is influenced by various factors such as the composition of the steel, its heat treatment, and any additional alloying elements. The impact strength is typically determined through testing, such as the Charpy or Izod impact test, which involves striking a notched sample of the steel bar with a pendulum and measuring the amount of energy absorbed by the material before it fractures. The results are usually reported in terms of the energy absorbed in joules (J) or foot-pounds (ft-lb). The impact strength of a steel round bar can vary greatly depending on its grade or specification. Different grades of steel have different levels of toughness, with some being more suitable for applications requiring high impact resistance, such as construction, automotive, or heavy machinery, while others may be better suited for less demanding applications. It is important to note that the impact strength is just one of the many mechanical properties that need to be considered when selecting a steel round bar for a specific application. Other factors, such as tensile strength, yield strength, hardness, and corrosion resistance, should also be taken into account to ensure the optimal performance and durability of the steel round bar in its intended use.

Q:What are the different surface hardness options for steel round bars?: Steel round bars can exhibit varying degrees of surface hardness, depending on the specific requirements and applications. There are several options available for achieving different levels of surface hardness in steel round bars: 1. Soft or annealed: At the lowest end of the surface hardness spectrum, steel is subjected to a heating and gradual cooling process to reduce internal stress and enhance ductility. Soft or annealed steel is easier to machine and shape, but it possesses lower strength and wear resistance. 2. Normalized: By heating steel to a predetermined temperature and subsequently cooling it in ambient air, the grain structure is refined, resulting in improved mechanical properties and increased hardness compared to annealed steel. 3. Quenched and tempered: This heat treatment process involves heating steel to high temperatures and quickly cooling it in a quenching medium like oil or water. The rapid cooling hardens the steel's surface, while the subsequent tempering process alleviates internal stresses and enhances toughness. Quenched and tempered steel round bars exhibit high levels of hardness and strength, making them suitable for applications requiring resistance to wear and impact. 4. Induction hardened: Through induction hardening, the surface of a steel round bar is selectively heated using an induction coil. This localized heating is followed by rapid quenching, resulting in a hardened surface layer that exhibits increased wear resistance. The core of the steel remains unaffected, retaining its toughness. 5. Case hardened: Also known as carburizing, case hardening involves introducing carbon into the surface layer of the steel round bar. This can be achieved by exposing the steel to a carbon-rich gas or heating it with a carbon-containing material. The carbon diffuses into the surface, increasing its hardness while leaving the core relatively softer. Case hardened steel round bars possess a tough core with a wear-resistant surface. These examples represent only a fraction of the available surface hardness options for steel round bars. The choice of hardness depends on specific application requirements such as required strength, wear resistance, and toughness.

Q:Can steel round bars be used for making cutlery or kitchen utensils?: Yes, steel round bars can indeed be used for making cutlery or kitchen utensils. Steel is a popular choice for kitchen utensils due to its strength, durability, and resistance to corrosion. However, the specific type of steel and the production process used will determine its suitability for culinary purposes. Stainless steel, for example, is highly recommended for cutlery and kitchen utensils as it is resistant to rust and stains, easy to clean, and does not react with food. Additionally, steel round bars can be easily shaped and formed into various utensil designs, making them a versatile material for cutlery and kitchenware manufacturing.

Q:Can steel round bars be hot worked?: Steel round bars can indeed undergo hot working, which involves shaping or forming the steel at high temperatures. This is typically done above the steel's recrystallization temperature, making it easier to deform and shape. Hot working of steel round bars can be accomplished through methods like hot rolling, hot forging, or hot extrusion. These processes entail heating the steel bar and applying mechanical force to shape it into the desired form. Hot working is commonly employed in the manufacturing of different steel products, like round bars, to enhance their mechanical properties and achieve specific shapes or sizes.

Q:What are the advantages of using creep-resistant steel round bars?: The advantages of using creep-resistant steel round bars include: 1. Enhanced strength and durability: Creep-resistant steel has high tensile strength and excellent resistance to deformation at elevated temperatures, making it suitable for applications in high-stress environments. 2. Increased safety: Creep-resistant steel round bars can withstand high temperatures without significant deformation, ensuring structural integrity and preventing failures in critical applications. 3. Extended service life: The resistance to creep deformation allows these round bars to maintain their shape and strength over an extended period, resulting in longer service life and reduced maintenance costs. 4. Versatile applications: Creep-resistant steel round bars are used in various industries, including power generation, oil and gas, petrochemical, and aerospace, due to their ability to withstand high temperatures and stress. 5. Cost-effectiveness: Although creep-resistant steel may have a higher initial cost compared to other materials, its extended service life, reduced maintenance requirements, and improved safety make it a cost-effective choice in the long run.

Q:How are steel round bars used in the construction of pipelines?: Steel round bars are commonly used in the construction of pipelines due to their high strength and durability. These bars are typically made from carbon or alloy steel and are available in various sizes and grades to suit the specific requirements of the pipeline. One of the key uses of steel round bars in pipeline construction is for reinforcement. They are often used as reinforcement in concrete foundations and supports along the pipeline route. The bars provide added strength and stability to the structure, ensuring that the pipeline remains secure and can withstand external forces such as soil movement or seismic activity. Additionally, steel round bars are also used as the main material for the fabrication of pipeline joints. These bars are typically bent or welded to form various shapes and sizes to connect different sections of the pipeline. The high tensile strength of steel ensures that the joints can withstand the pressure and stress exerted by the fluids being transported through the pipeline. Moreover, steel round bars are utilized in the construction of pipeline hangers and supports. These bars are often shaped and welded to form brackets or clamps that hold the pipeline in place. The bars provide a sturdy and reliable support system, preventing sagging or movement of the pipeline, and ensuring smooth and uninterrupted flow. In summary, steel round bars play a crucial role in the construction of pipelines. They are used for reinforcement, fabrication of pipeline joints, and the construction of hangers and supports. Their high strength, durability, and versatility make them an ideal choice for ensuring the structural integrity and reliability of pipelines.

Q:Can steel round bars be bent or shaped?: Certainly! Steel round bars have the capability to undergo bending and shaping. Steel, being a highly malleable material, can be formed into desired shapes through different processes. Techniques such as hot bending, cold bending, or induction bending can be employed to bend the steel. By applying force to the steel bar, it can be deformed and molded into the desired shape. Moreover, machining processes like turning, drilling, milling, or grinding can also be utilized to shape steel round bars. These processes enable the creation of various profiles, including cylindrical, square, or hexagonal shapes, among others. In summary, steel round bars provide great flexibility for bending and shaping, allowing for their versatile use in a wide range of applications.

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