High Strength Steel Round Bar 4140 Round Bar Steel

High Strength Steel Round Bar 4140 Round Bar Steel System 1

High Strength Steel Round Bar 4140 Round Bar Steel System 2

High Strength Steel Round Bar 4140 Round Bar Steel System 3

High Strength Steel Round Bar 4140 Round Bar Steel System 4

High Strength Steel Round Bar 4140 Round Bar Steel

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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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1,Size of 4140 Carbon Alloy Steel
Round bar	Diameter(mm)	Length (mm)
20~800	3000~9000
Plate	Thickness(mm)	Width (mm)	Length (mm)
Max:800	Max:2200	Max:9000
The specification can be customized.
2,Chemical Compositons
Grade	C	Si	Mn	P	S	Cr	Mo	Ni
42CrMo	0.38~0.45	0.17~0.37	0.50~0.8	≤0.035	≤0.035	0.9~1.2	0.15-0.25	≤0.3
4140	0.40~0.45	0.15~0.35	0.75~1.0	≤0.035	≤0.040	0.8~1.1	0.15-0.25	-
SCM44	0.38~0.43	0.15~0.35	0.60~0.9	≤0.030	≤0.030	0.9~1.2	0.15-0.30	≤0.25
1.7225	0.38~0.45	≤0.40	0.60~0.9	≤0.025	≤0.035	0.9~1.2	0.15-0.30
3,Features of 4140 alloy steel
1, Chromium molybdenum alloy steel
2, Slightly higher carbon content then 4130
3, Greater strength and heat treatment
4,Typical Applications
1, Applications in the oil and gas sector
2, Connection rods, collets, conveyor pins,
3, Gears, stem assemblies,
4, Pump shafts and tool holders

Alloy Steel	5140,5115,5120,5130,5145,4118,4130,4135,6150,5115,4142,4130,4118,6150,4140,4720,4320 ,E9310,8620,4340
Tool Steel	H13,1.2344,SKD61,D2,SKD11,1.2379,1.2510,01,SKS3,95MnWCr5,D3,SKD1,1.2419, SKS31,H21,SKD5,1.2581,P20,35CrMo7,1.2738,1.2316,M2
Bearing Steel	GCr15,52100,SUJ1,SUJ2,100Cr6,1.2067,55C,8620,4320,9310,440C,M50
Spring Steel	9260,SUP6,SUP7,1.7108,54SiCr6,1.7102,5155,SUP9,1.7176,5160,1.7177,6150, SUP10,51CrV4,1.8159
Stainless Steel	321,sus321,1.4541,304,SUS304,1.4301,410,SUS410,1.4006,420,1.4021,1.4028, 434,1.4113,316L,SUS316L,1.4435,630,1.4542,431,1.4057,201,202,301

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: How are steel round bars tested for tensile strength?: Steel round bars are tested for tensile strength through a process called tensile testing. This involves pulling the bar until it breaks, while measuring the amount of force applied. The results are then used to determine the maximum load the bar can withstand before fracturing, providing an indication of its tensile strength.

Q: What are the advantages of using nickel-chromium-titanium alloy steel round bars?: Some advantages of using nickel-chromium-titanium alloy steel round bars include their high strength and durability, excellent corrosion resistance, and good heat resistance. These alloy steel round bars also offer superior wear resistance and can withstand harsh environments. Additionally, they have good machinability, making them suitable for various applications in industries such as aerospace, automotive, and oil and gas.

Q: What are the advantages of using alloy steel round bars?: There are several advantages of using alloy steel round bars. Firstly, alloy steel has superior strength and hardness compared to regular steel, making it more durable and resistant to wear and tear. Secondly, alloy steel round bars offer excellent corrosion resistance, making them suitable for use in various environments, including marine and chemical industries. Additionally, alloy steel can withstand high temperatures, making it ideal for applications that involve heat or extreme conditions. Lastly, alloy steel round bars can be easily machined and fabricated, allowing for versatility in design and customizations.

Q: What are the different methods used for machining steel round bars?: Machining steel round bars involves the use of various methods, each with its own advantages and applications. Some commonly employed techniques are as follows: 1. Turning: To achieve the desired shape, the steel round bar is rotated against a cutting tool that removes material. Turning is suitable for both external and internal operations, ensuring high precision and excellent surface finish. 2. Milling: This versatile method employs a rotating multi-tooth cutter to remove material from the steel round bar, creating flat or contoured surfaces. It is ideal for face milling, slotting, and profiling. 3. Drilling: Holes of different sizes and depths are created in the steel round bar using a rotating drill bit. This method can be performed manually or through automated processes. 4. Grinding: Precision is key in grinding, a machining technique that employs abrasives to remove material from the steel round bar. It ensures smooth surface finish, tight tolerances, and precise dimensions. Grinding machines, such as cylindrical or surface grinders, are utilized. 5. Boring: Boring enlarges existing holes or creates internal cylindrical shapes within the steel round bar. This technique involves rotating a cutting tool inside the bar to achieve desired dimensions and surface finish. 6. Broaching: Complex internal or external shapes are created using a broach, a multi-toothed cutting tool. The broach is pushed or pulled through the steel round bar to remove material and form the desired shape. 7. Sawing: The steel round bar is cut into desired lengths or shapes using a rotating blade with teeth. Sawing is efficient for mass production and can be done manually or with automated machines. These methods are just a selection of the techniques used for machining steel round bars. The choice of method depends on factors such as the desired shape, dimensions, tolerances, and surface finish, as well as the production volume and available equipment.

Q: What is the difference between carbon steel and alloy steel round bars?: Both carbon steel and alloy steel round bars find extensive use across various industries, although they vary in terms of their composition and properties. In particular, carbon steel round bars consist predominantly of iron and carbon, with small amounts of other elements present. Depending on the grade, the carbon content typically ranges between 0.05% and 2.0%. These bars are renowned for their robustness and hardness, rendering them suitable for applications demanding high durability and resistance to wear. Additionally, carbon steel round bars possess excellent machinability, allowing them to be easily shaped and molded into desired forms. Nevertheless, they may exhibit limited resistance to corrosion, necessitating the application of additional protective coatings in corrosive environments. In contrast, alloy steel round bars are produced by incorporating various alloying elements into carbon steel. Such elements encompass manganese, chromium, nickel, molybdenum, and others. The inclusion of these elements augments the properties of the steel, including enhanced strength, toughness, and resistance to wear and corrosion. Alloy steel round bars are frequently selected for applications demanding specific characteristics, such as resistance to high temperatures, a high strength-to-weight ratio, or improved machinability. In conclusion, the primary disparity between carbon steel and alloy steel round bars lies in their composition and resulting properties. Carbon steel round bars primarily consist of iron and carbon, offering commendable strength and hardness; however, they may exhibit limited resistance to corrosion. Conversely, alloy steel round bars incorporate supplementary alloying elements, bolstering specific properties like increased strength, toughness, and corrosion resistance. The selection between carbon steel and alloy steel round bars hinges upon the precise requirements of the application at hand.

Q: What is the difference between a hot rolled and a precision ground steel round bar?: A hot rolled steel round bar and a precision ground steel round bar differ primarily in their manufacturing processes and resulting surface finish. Hot rolled steel round bars are produced by heating the steel billet or ingot to high temperatures and then passing it through a series of rollers to achieve the desired shape and size. This process results in a rougher surface finish with visible mill-scale or oxide layers. The hot rolling process also allows for variations in size and shape, making it a more cost-effective option for producing steel round bars in large quantities. On the other hand, precision ground steel round bars undergo a more refined and controlled manufacturing process. After the initial hot rolling, the bar is then ground to achieve a smooth and consistent surface finish. Precision grinding removes the mill-scale and oxide layers, resulting in a more polished appearance. This process also ensures a tight dimensional tolerance and improved straightness of the round bar. The choice between a hot rolled and a precision ground steel round bar depends on the specific application requirements. Hot rolled round bars are typically used in applications where surface finish is not critical, such as structural components, machinery parts, or construction materials. Precision ground steel round bars, on the other hand, are utilized in applications where a smooth surface finish, precise dimensions, and tight tolerances are necessary, such as in the manufacturing of precision tools, machinery components, or in industries like aerospace or automotive. In summary, the main difference between a hot rolled and a precision ground steel round bar lies in their manufacturing processes and resulting surface finish. Hot rolled round bars offer cost-effectiveness and versatility, while precision ground round bars provide a smoother surface finish, tighter tolerances, and improved dimensional accuracy for more demanding applications.

Q: What are the limitations of using steel round bars?: There are several limitations to using steel round bars. Firstly, steel round bars have a limited strength-to-weight ratio, which means they may not be suitable for applications that require high strength and low weight. Additionally, steel round bars can be prone to corrosion and rust if not properly protected or maintained. Another limitation is their inability to be easily shaped or bent, making them less flexible for certain design requirements. Lastly, steel round bars may not be cost-effective for small-scale or low-budget projects due to their higher material and manufacturing costs compared to other alternatives.

Q: How do you calculate the weight of a steel round bar based on its length and diameter?: The weight of a steel round bar can be determined by utilizing the subsequent equation: Weight = (π/4) x (Diameter^2) x Length x Density. In this equation, π denotes the mathematical constant pi, with an approximate value of 3.14159. Diameter represents the measurement across the widest point of the steel round bar, while Length corresponds to the overall length of the bar. Additionally, Density signifies the typical density of steel, which is approximately 7850 kilograms per cubic meter. To calculate the weight, first square the diameter and then proceed to multiply it by the length and density. Finally, multiply the outcome by π/4 to obtain the weight of the steel round bar in the desired units, typically kilograms or pounds. It is crucial to acknowledge that this equation assumes the steel round bar is a solid cylinder with a uniform diameter. If there are any variations or irregularities present in the bar, the weight determined using this equation may not be entirely accurate.

Q: Can steel round bars be used for fastener applications?: Indeed, fastener applications can make use of steel round bars. In various industries, these round bars are frequently employed as fasteners due to their remarkable durability and high strength. By threading, drilling, or machining them, a variety of fasteners, including bolts, screws, and studs, can be fashioned. The outstanding tensile strength and corrosion resistance of steel round bars render them suitable for demanding tasks that necessitate robust and dependable fastening. Moreover, these round bars are easily obtainable in assorted sizes and grades, enabling customization based on precise fastener needs.

Q: What is the maximum length of a steel round bar available?: The maximum length of a steel round bar available depends on various factors such as the manufacturing capabilities of the steel supplier, transportation limitations, and practical considerations. However, typical maximum lengths range from 20 to 40 feet (6 to 12 meters), but it is always best to consult with a steel supplier to determine the specific lengths they offer.

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