42CrNiMo4 Alloy Structural Steel Round Bars

42CrNiMo4 Alloy Structural Steel Round Bars System 1

42CrNiMo4 Alloy Structural Steel Round Bars System 2

42CrNiMo4 Alloy Structural Steel Round Bars System 3

42CrNiMo4 Alloy Structural Steel Round Bars System 4

42CrNiMo4 Alloy Structural Steel Round Bars

Ref Price:

Loading Port:: China main port

Payment Terms:: TT or LC

Min Order Qty:: 30 m.t.

Supply Capability:: 10000 m.t./month

Inquire Now

Add to My Favorites

OKorder Service Pledge

Quality Product, Order Online Tracking, Timely Delivery

OKorder Financial Service

Credit Rating, Credit Services, Credit Purchasing

Carbon Steel Round Bar	SS400, S235JR,Q235, ASTM A36, Fe360A, Fe360B,SM400A,080A15, SS41,E235B
SAE 1020, AISI 1020, ASTM 1020, S20C, 20#, 050A20
SAE 1045, AISI 1045, ASTM 1045, S45C, 45#,EN8, XC45, XC48, 45B, C45, CK45, CM45, 060A47, R683/IC45e
Alloy Steel Round Bar	40Cr, DIN 1.7035, SAE 5140, AISI 5140, ASTM 5140, SCr440, 41Cr4, 530A40, 42Cr4, 40X, R683/VII3
SAE4140,42CrMo, 42CrMo4, DIN 1.7225, SCM440,EN19, 42CD4, 708M40, R683/II3
SAE 4340, 40CrNiMoA, EN24, SNCM439, 817M40,40XMA, R683/III4
SAE 8620,,AISI 8620, ASTM 8620, 20CrNiMo,SNCM220, 805M20
SAE52100, AISI52100,ASTM E52100, GCr15, SUJ2, 100C6, 100Cr6, 1.3505, 534A99, IIIX15

Standard	Grade	C	Cr	Mo	Si	Mn	P	S	Ni	Cu
GB	42CrMo	0.38-0.45	0.90-1.20	0.15-0.25	0.17-0.37	0.50-0.80	0.035	0.035	0.3	0.3
JIS	SCM440	0.38-0.43	0.90-1.20	0.15-0.30	0.15-0.35	0.60-0.90	0.03	0.03	0.25	0.3
ASTM	4140	0.38-0.43	0.80-1.10	0.15-0.25	0.15-0.35	0.75-1.00	0.035	0.04	—	—
ENISO	42CrMo4	0.38-0.45	0.90-1.20	0.15-0.30	≤0.40	0.60-0.90	0.035	0.035	—	—

Grade	Tensile Strength (Mpa)	Yield Strength (Mpa)	Elongation (%)	Reduction of Area (%)	Charpy Impact (J)
42CrMo	≥1080	≥930	≥12	≥45	≥63

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

Round steel refers to the solid section for circular strip steel.Its specifications expressed as a number of mm in diameter, such as ""50"" indicates that the diameter of 50 mm round steel.Round steel hot rolling, forging and cold drawn three kinds.The specifications of the hot rolled round steel of 5.5 to 250 mm.5.5-25 mm small round steel are mostly with straight into bundles of supplies, commonly used for reinforcing steel bar, bolt, and various mechanical parts;More than 25 mm round steel,mainly used in the manufacture of mechanical parts and seamless steel tube billet.

Carbon steel according to the chemical composition (i.e., with carbon content) can be divided into low carbon steel, medium carbon steel and high carbon steel.According to the quality of the steel can be divided into ordinary carbon steel and high quality carbon steel.According to the purposes and can be divided into carbon structural steel, carbon tool steel.

The difference between the round steel and other steel: 1 appearance is not the same, round steel exterior circle of light, no lines without ribs, and other steel surface appearance has a groove or a rib, thus causing the cohesive force of small round steel and concrete, and the other the cohesive force of steel bar and reinforced concrete.2 ingredients are different, round steel (level 1) steel belong to the normal low carbon steel, more than other reinforcement for alloy steel.Three different intensity, low intensity of round steel and other steel high strength namely round steel have larger deformation before is pulled, and reinforced by other tensile deformation is much smaller.

Q: Can steel round bars be used for making pipelines?: Yes, steel round bars can be used for making pipelines. They are often used as the main material for pipelines due to their high strength and durability, which enables them to withstand the pressure and environmental conditions that pipelines are exposed to. Additionally, steel round bars can be easily welded together to create a continuous pipeline, ensuring a reliable and efficient transportation system for various fluids or gases.

Q: What is the difference between a cold-drawn and a centerless ground steel round bar?: A cold-drawn steel round bar is produced by pulling the steel through a die at room temperature, resulting in increased hardness and improved surface finish. On the other hand, a centerless ground steel round bar is produced by grinding the outer diameter of the steel bar to achieve tight dimensional tolerances and a smooth surface finish. In summary, the main difference lies in the manufacturing process and the resulting properties and finish of the steel round bar.

Q: What are the advantages of using duplex steel round bars?: There are several advantages of using duplex steel round bars in various applications. Firstly, duplex steel round bars offer excellent corrosion resistance. This type of steel contains a balanced combination of chromium, nickel, and molybdenum, which enables it to withstand harsh environments, including marine and chemical industries. This corrosion resistance makes duplex steel round bars ideal for applications where exposure to corrosive elements is high. Secondly, duplex steel round bars possess high strength and toughness. The duplex microstructure of this steel combines both ferrite and austenite phases, resulting in a material with higher strength compared to traditional stainless steels. This enhanced strength and toughness make duplex steel round bars suitable for demanding applications that require high load-bearing capacities. Additionally, duplex steel round bars exhibit good fatigue resistance. This property makes them suitable for applications subjected to cyclic loading or dynamic stress, such as in structural components or machinery parts. The fatigue resistance of duplex steel allows for extended service life and reliability in such applications. Another advantage of using duplex steel round bars is their superior weldability. They offer good weldability due to their balanced chemical composition and microstructure. This makes it easier to fabricate and join duplex steel round bars, reducing production time and costs in various industries. Furthermore, duplex steel round bars have excellent resistance to stress corrosion cracking (SCC). SCC occurs when a material is exposed to a corrosive environment combined with tensile stresses, leading to premature failure. The ability of duplex steel to resist SCC makes it a preferred choice for applications where the risk of stress corrosion cracking is high, such as in offshore and oil and gas industries. Lastly, duplex steel round bars offer cost-effective solutions. Despite their superior properties, duplex steel round bars are often more cost-effective than other high-performance materials. Their long service life, reduced maintenance requirements, and overall durability contribute to lower lifecycle costs, making them an economical choice for various applications. In summary, the advantages of using duplex steel round bars include excellent corrosion resistance, high strength and toughness, good fatigue resistance, superior weldability, resistance to stress corrosion cracking, and cost-effectiveness. These properties make duplex steel round bars a preferred choice for a wide range of industries, including oil and gas, chemical processing, marine, and structural applications.

Q: What are the different surface finishes available for steel round bars?: There are several surface finishes available for steel round bars, each offering unique properties and applications. Some of the common surface finishes include: 1. Hot Rolled: This is the most basic surface finish, achieved by heating the steel above its recrystallization temperature and then allowing it to cool. It provides a rough and scaled surface, ideal for applications that do not require a high level of aesthetics. 2. Cold Drawn: In this process, the steel round bar is pulled through a die at room temperature, resulting in a smooth and polished surface. Cold drawn surface finish offers improved dimensional accuracy and tighter tolerances, making it suitable for applications that require precision and a visually appealing appearance. 3. Turned and Polished: Steel round bars can be turned on a lathe machine to achieve a smooth and shiny surface finish. This process removes any imperfections and irregularities, providing a close tolerance and highly finished surface. Turned and polished bars are often used in applications where a high level of surface finish and dimensional accuracy is required, such as in the manufacturing of shafts and precision components. 4. Ground: Steel round bars can be ground to remove any surface defects or irregularities. Grinding produces a highly accurate and smooth surface finish, making it suitable for applications that require close tolerances and a superior surface finish. Ground bars are commonly used in the manufacturing of bearings, gears, and other high-precision components. 5. Coated: Steel round bars can also be coated with various materials to enhance their performance and protect them from corrosion. Common coating options include zinc, chrome, and nickel. Coated bars offer improved durability, resistance to corrosion, and enhanced aesthetic appeal. The choice of surface finish for steel round bars depends on the specific requirements of the application, such as dimensional accuracy, surface quality, corrosion resistance, and aesthetic appeal.

Q: What is the yield strength of a steel round bar?: The yield strength of a steel round bar refers to the amount of stress or force that the bar can withstand before it starts to deform or permanently change shape. This is an important property to consider when designing or selecting materials for structural applications. The yield strength of a steel round bar can vary depending on the specific grade or type of steel being used. Common grades of steel such as A36, 1018, and 4140 typically have yield strengths ranging from 36,000 psi (pounds per square inch) to 100,000 psi. However, it is important to note that the yield strength can also be influenced by factors such as heat treatment, manufacturing processes, and the presence of any alloying elements in the steel composition. Therefore, it is always recommended to consult the specific material specifications or conduct proper testing to determine the exact yield strength of a steel round bar in a given application.

Q: Are steel round bars resistant to impact?: Yes, steel round bars are generally resistant to impact. Steel is known for its high strength and durability, making it highly resistant to impacts and forces. The round shape of the bars also helps distribute the impact evenly, reducing the risk of deformation or breakage. However, it is important to note that the specific resistance to impact may vary depending on the grade and quality of the steel, as well as the magnitude and nature of the impact force.

Q: How are steel round bars made?: Steel round bars are made through a process called hot rolling. It involves heating a large rectangular steel billet until it reaches a malleable temperature. The heated billet is then passed through a series of rolling stands, which progressively reduce its thickness and shape it into a round bar. The first step in the hot rolling process is heating the billet in a furnace at extremely high temperatures, typically around 1200 to 1300 degrees Celsius. This heat makes the steel more pliable and easier to shape. Once the billet is heated, it is fed into a rolling mill. The mill consists of a series of rollers that gradually reduce the thickness and elongate the billet. As the billet passes through each set of rollers, it is squeezed and stretched, gradually forming a round shape. The number of passes through the rolling mill depends on the desired final size and shape of the round bar. During the rolling process, the steel bar is also cooled to prevent overheating and ensure proper metallurgical properties. This can be done through a water spray or air cooling system. After the bar has been shaped and cooled, it is cut into desired lengths. The cut bars are then subjected to further processes such as straightening, surface treatment, and quality testing. These additional steps ensure that the steel round bars meet the required specifications and standards. Overall, the process of making steel round bars involves heating a steel billet, passing it through a series of rolling stands to shape it into a round bar, cooling it, and then cutting it into desired lengths. This process allows for the production of strong and durable round bars that find various applications in industries such as construction, manufacturing, and engineering.

Q: What are the different types of steel round bar surface finishes used in the aerospace industry?: In the aerospace industry, there are several types of steel round bar surface finishes commonly used. These include: 1. Smooth Finish: This is a standard surface finish that is achieved through machining or grinding processes. It provides a smooth and polished surface, ensuring minimal friction and wear. 2. Brushed Finish: This finish is achieved by brushing the steel round bar with a fine abrasive material. It creates a distinctive linear pattern on the surface, enhancing its aesthetic appeal while maintaining a smooth texture. 3. Shot Blasted Finish: In this process, steel round bars are bombarded with small steel shots at high velocity. This results in a textured and slightly rough surface, which improves grip and provides better adhesion for coatings or paints. 4. Peened Finish: Peening involves impacting the surface of the steel round bar with small metal pellets or balls. This creates a dimpled texture, enhancing the material's resistance to fatigue and improving its strength and durability. 5. Anodized Finish: This is a surface treatment commonly used on aluminum alloys in the aerospace industry. However, it can also be applied to steel round bars. Anodization creates a thin, protective oxide layer on the surface, enhancing corrosion resistance and improving the material's appearance. These different types of surface finishes are chosen based on the specific requirements of the aerospace industry, considering factors such as durability, corrosion resistance, aesthetics, and functionality.

Q: What are the different types of heat treatments used for steel round bars?: There are several different types of heat treatments that are commonly used for steel round bars. These treatments are designed to alter the physical and mechanical properties of the steel, making it more suitable for specific applications. 1. Annealing: This heat treatment involves heating the steel to a high temperature and then slowly cooling it, usually in a furnace. Annealing relieves internal stresses and improves the steel's ductility, making it easier to work with and less prone to cracking. 2. Normalizing: Similar to annealing, normalizing also involves heating the steel to a high temperature and then cooling it, but the cooling process is done in still air. Normalizing refines the steel's grain structure, making it more uniform and improving its strength and toughness. 3. Quenching and tempering: This heat treatment involves heating the steel to a high temperature and then rapidly cooling it by quenching it in a liquid, such as oil or water. This process hardens the steel, making it stronger and more resistant to wear and deformation. However, quenching can also make the steel brittle, so it is often followed by tempering, which involves reheating the steel to a lower temperature and then slowly cooling it. Tempering reduces the brittleness and improves the steel's toughness, while still maintaining a high level of strength. 4. Case hardening: This heat treatment is used to create a hard outer layer, or case, on the surface of the steel, while maintaining a softer and more ductile core. The steel is heated in the presence of a carbon-rich material, such as charcoal or gas, which diffuses carbon into the surface of the steel. This generates a hardened layer that is resistant to wear, while the core remains tough and shock-resistant. 5. Stress relieving: This heat treatment is used to reduce internal stresses that may have been generated during manufacturing processes, such as machining or welding. The steel is heated to a temperature below its critical point and then slowly cooled, which helps to relieve the residual stresses and improve the dimensional stability of the steel. These are just a few of the most common types of heat treatments used for steel round bars. The specific heat treatment chosen will depend on the desired properties and the intended application of the steel.

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 be used to improve cleanliness. 1. Bright Surface Finish: This is achieved by polishing the steel round bar, resulting in a smooth and reflective surface. Bright surface finishes are commonly used in applications where cleanliness and appearance are important, such as in the manufacturing of kitchen appliances or decorative items. 2. Satin Finish: This finish is achieved by brushing the steel round bar with fine abrasive pads, resulting in a smooth and matte surface. Satin finishes are often used in applications where a clean and modern aesthetic is desired, such as in architectural designs or furniture manufacturing. 3. Pickled Finish: This finish involves immersing the steel round bar in an acid solution, which removes any impurities or oxides from the surface. Pickled finishes are commonly used in applications where the steel round bar will be further processed, such as in the production of pipes or tubes. 4. Passivated Finish: This finish involves treating the steel round bar with a chemical solution, which forms a protective oxide layer on the surface. Passivated finishes are used to enhance the corrosion resistance of the steel round bar, making it suitable for applications in harsh or corrosive environments. 5. Shot Blasted Finish: This finish involves propelling small metal or ceramic particles at high velocity onto the surface of the steel round bar. Shot blasting removes any scale, rust, or surface contaminants, resulting in a clean and textured surface. Shot blasted finishes are commonly used in applications where a good bond between the steel round bar and another material, such as paint or coating, is required. Overall, the choice of steel round bar surface finish depends on the specific application and the desired level of cleanliness. Each finish offers unique properties and benefits, allowing for improved cleanliness and performance in various industries.

Send your message to us

*Email

*TEL

*Quantity

*Unit