ASTM 5140 Alloy Steel Round Bar System 1

ASTM 5140 Alloy Steel Round Bar System 2

ASTM 5140 Alloy Steel Round Bar System 3

ASTM 5140 Alloy Steel Round Bar System 4

ASTM 5140 Alloy Steel Round Bar

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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	0.37-0.44 %	Tensile strength(MPA)	≥980(100)
Si	0.17-0.37 %	Yield strength (MPA)	≥785(80)
Mn	0.50-0.80 %	Elongation (δ5/%)	≥9
Cr	0.80-1.10 %	Reduction in Area (ψ/%)	≥45
Ni	≤0.30 %	Impact (J)	≥ 47
P	≤0.035 %	Impact toughness value αkv (J/cm2)	≥59(6)
S	≤0.035 %	Hardness	≤207HB
Cu	≤0.030 %

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: Are steel round bars corrosion resistant?: Yes, steel round bars can be corrosion resistant depending on the specific type of steel used and the conditions they are exposed to. Some types of steel, such as stainless steel, contain alloying elements like chromium which create a protective layer that helps prevent corrosion. However, not all steel round bars are inherently corrosion resistant and may require additional coatings or treatments to enhance their resistance to corrosion.

Q: Can steel round bars be heat treated to improve their mechanical properties?: Steel round bars can undergo heat treatment to enhance their mechanical properties. Heat treatment involves heating the steel to a specific temperature, maintaining it at that temperature for a certain duration, and then cooling it rapidly or slowly. This process can modify the microstructure of the steel, resulting in changes to its hardness, strength, toughness, and other mechanical properties. Various types of heat treatment processes can be applied to steel round bars, depending on the desired outcome. For instance, annealing is a process that entails heating the steel to a specific temperature and subsequently cooling it gradually. This method helps alleviate internal stresses in the steel, enhance its ductility, and facilitate machining. Another commonly used heat treatment process is quenching and tempering. This involves heating the steel to a specific temperature and rapidly cooling it, often by immersing it in an oil or water quenching medium. This swift cooling process helps strengthen the steel, making it more resistant to wear and abrasion. Following quenching, the steel is typically tempered by reheating it to a lower temperature, reducing its brittleness and improving its toughness. In addition to annealing and quenching and tempering, other heat treatment processes such as normalizing, case hardening, and precipitation hardening can also be employed to enhance the mechanical properties of steel round bars. These processes involve different heating and cooling techniques, and are utilized to achieve specific outcomes based on the desired properties of the steel. Overall, heat treatment is a versatile and effective approach for improving the mechanical properties of steel round bars. By carefully controlling the heating and cooling process, significant improvements in hardness, strength, toughness, and other properties can be achieved, rendering the steel suitable for a wide range of applications.

Q: What are the advantages of using steel round bars?: There are several advantages to using steel round bars. Firstly, steel round bars have high strength and durability, making them suitable for various applications that require structural integrity and resistance to wear and tear. Secondly, steel round bars offer excellent machinability, allowing for easy shaping and customization according to specific project requirements. Additionally, steel round bars have a high load-bearing capacity, making them an ideal choice for heavy-duty applications such as construction and manufacturing. Lastly, steel round bars have good corrosion resistance, making them suitable for outdoor and marine environments where exposure to moisture and harsh conditions is common.

Q: Can steel round bars be used for making transmission components?: Yes, steel round bars can be used for making transmission components. Steel is a widely used material in the manufacturing industry, and it offers excellent strength, durability, and resistance to wear and tear. Round bars made of steel are commonly used in the production of transmission components such as gears, shafts, and couplings. The steel round bars are often machined or forged into the desired shape and then heat-treated to enhance their mechanical properties. The use of steel round bars ensures that the transmission components can withstand high loads, provide smooth power transmission, and have a long service life.

Q: What are the different surface defects that can be found in steel round bars?: There are several surface defects that can be found in steel round bars. These defects can vary in severity and can have an impact on the overall quality and performance of the steel. Some common surface defects include: 1. Scale: Scale refers to the thin, flaky layer of iron oxide that forms on the surface of steel during the manufacturing process. It can appear as a rough, scaly texture and may cause issues with adhesion or coating application. 2. Pitting: Pitting is the formation of small holes or depressions on the surface of the steel. It can be caused by corrosion, contamination, or uneven heating during the manufacturing process. Pitting can weaken the structural integrity of the steel and increase the likelihood of failure. 3. Scratches: Scratches are superficial marks or cuts on the surface of the steel. They can occur during handling, transportation, or processing. While small scratches may not significantly affect the performance of the steel, deep or extensive scratches can create stress concentrations and reduce the strength of the material. 4. Cracks: Cracks are linear fractures that can occur on the surface of the steel. They can be caused by excessive cooling, improper heat treatment, or mechanical stress. Cracks can propagate and lead to catastrophic failure if not detected and addressed. 5. Decarburization: Decarburization is the loss of carbon content on the surface of the steel due to exposure to high temperatures or improper heat treatment. It can result in a softer and weaker surface layer, reducing the material's strength and hardness. 6. Laminations: Laminations are layers or separations within the steel round bar that can occur due to improper rolling or manufacturing processes. These can weaken the material and reduce its load-bearing capacity. 7. Inclusions: Inclusions are non-metallic impurities or foreign substances that are trapped within the steel during the manufacturing process. They can include oxides, sulfides, or other debris. Inclusions can act as stress concentrators and reduce the material's resistance to cracking and deformation. Detecting and addressing these surface defects is crucial to ensure the quality and reliability of steel round bars. Various inspection techniques such as visual examination, ultrasonic testing, magnetic particle testing, or dye penetrant testing can be employed to identify and assess the severity of these defects.

Q: What are the different types of threads used for steel round bars?: The usage of various thread types for steel round bars depends on the specific application and requirements. The most common thread types for steel round bars are as follows: 1. Unified National Coarse (UNC) Thread: This thread type is widely utilized for general-purpose applications and offers a relatively coarse pitch. It is suitable for most common applications that do not demand high strength. 2. Unified National Fine (UNF) Thread: UNF threads have a finer pitch compared to UNC threads and provide better resistance to vibration. They are commonly employed in applications that require a higher level of thread engagement and improved thread performance. 3. Metric Thread: Metric threads are prevalent in countries that adopt the metric system. They are characterized by their pitch, which determines the distance between each thread. Metric threads offer a precise and standardized threading solution for diverse applications. 4. Acme Thread: Acme threads possess a trapezoidal shape and find frequent use in applications necessitating high strength and resistance to wear and tear. They are often employed in heavy-duty machinery like lead screws, jackscrews, and power transmission systems. 5. Buttress Thread: Buttress threads have a triangular shape, with one side perpendicular to the thread axis. This unique design enables them to bear high loads and resist axial forces in a specific direction. Buttress threads are commonly found in applications involving high-pressure fluid flow, such as hydraulic cylinders and pumps. 6. Whitworth Thread: Whitworth threads were extensively used in the past but have become less common in modern times. They have a rounded profile and a coarse pitch. Whitworth threads can still be found in older machinery and equipment. Choosing the appropriate thread type for a specific application is crucial to ensure the proper fit, functionality, and durability of the steel round bar. Factors such as load requirements, environmental conditions, compatibility with mating parts, and industry standards will determine the suitable thread type for a given situation.

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: Can steel round bars be used for making bridges?: Yes, steel round bars can be used for making bridges. Steel round bars are commonly used in bridge construction due to their high strength, durability, and ability to withstand heavy loads. They are often used as structural elements in bridge girders, piers, and columns, providing stability and support to the overall structure. Additionally, steel round bars can be easily fabricated and shaped to meet the specific design requirements of a bridge.

Q: Are steel round bars suitable for the production of crankshafts?: Yes, steel round bars are suitable for the production of crankshafts. Steel round bars offer excellent strength, durability, and machinability, making them ideal for withstanding the high stress and rotational forces experienced by crankshafts in an engine. Additionally, steel's ability to be heat-treated and hardened further enhances its suitability for crankshaft production.

Q: Can steel round bars be used for making staircases?: Yes, steel round bars can be used for making staircases. They provide durability, strength, and a modern aesthetic appeal to the staircase design.

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