SCM440 SCM415 SAE4140 Steel Round Bar /AISI 4140 Steel
- Ref Price:
-
- Loading Port:
- China main port
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 5 m.t.
- Supply Capability:
- 100000 m.t./month
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Specification
Standard:
AISI,JIS,GB,BS,DIN,API,EN,ASTM
Technique:
Hot Rolled,Cold Rolled,Cold Drawn,ERW,Forged,Saw,Extruded,EFW,Spring
Shape:
U Channel,Square,C Channel,Hexagonal,Round,Rectangular,Oval,LTZ
Surface Treatment:
Galvanized,Coated,Copper Coated,Color Coated,Oiled,Dry,Chromed Passivation,Polished,Bright,Black,PVDF Coated
Steel Grade:
Q195,Q215,Q235,Q215B,Q235B,RHB335,HRB400,200 Series,300 Series,400 Series,600 Series,SS400-SS490,10#,20#,A53(A,B)
Certification:
ISO,SGS,CE
Thickness:
as required
Length:
as required
Net Weight:
as required
SCM440 SCM415 SAE4140 Steel Round Bar /AISI 4140 Steels
1. Dia:12mm-300mm
2. Standard Performed: ASTM A29/A29M-04
3. Equal Standard:
America Standard: AISI4140
International Standard: 42CrMo4
Japan Standard: SCM440
Germany Standard: 42CrMo4
4. Chemical composition:
Grade | C | Si | Mn | P | S | Ni | Cr | Mo | Cu | Al |
AISI4140 | 0.38 0.41 | 0.15 0.35 | 0.85 1.00 | Max 0.015 | Max 0.040 | Max 0.25 | 0.80 1.10 | 0.15 0.25 | Max 0.35 | 0.012 0.030 |
5. Grade: ASTM A29 4140 42CrMo SCM440
Hardness:217HB
Tensile strength:1080(110)MPA
Yield strength: 930(95)MPA
Elogation: 12%
Reduction of area: 45%
AKV(impact value): 63J
- Q: How do steel round bars perform under bending or flexing forces?
- Steel round bars generally perform well under bending or flexing forces due to their high tensile strength and ductility. When subjected to bending forces, the steel round bars can resist deformation and maintain their shape, making them suitable for various applications such as construction, manufacturing, and engineering. The combination of high strength and ductility allows the bars to absorb and distribute the applied load evenly, minimizing the risk of failure or breakage. The behavior of steel round bars under bending or flexing forces can be further enhanced by factors such as the alloy composition, heat treatment, and manufacturing process. Different grades of steel can offer varying levels of strength, toughness, and resistance to bending. Heat treatment processes like quenching and tempering can further improve the mechanical properties, making the bars more resistant to bending and flexing. However, it is important to note that excessive bending or flexing can lead to permanent deformation or failure of the steel round bars. Overloading or repeated bending beyond the material's limits can cause stress concentrations, microcracks, or even fractures. Therefore, it is crucial to determine the appropriate bending limits and ensure proper design and installation to maintain the structural integrity and safety of steel round bars under bending or flexing forces.
- Q: Can steel round bars be coated for added protection?
- Yes, steel round bars can be coated for added protection. Coating them with materials like epoxy, zinc, or other corrosion-resistant substances can help prevent rusting, extend their lifespan, and enhance their resistance to various environmental factors.
- Q: What is the difference between a cold-drawn and a centerless ground steel round bar?
- A cold-drawn steel round bar and a centerless ground steel round bar are both types of steel bars that have undergone different manufacturing processes, resulting in different characteristics and properties. Cold-drawn steel round bars are produced by pulling a hot-rolled or annealed steel bar through a die to reduce its diameter and increase its length. This process improves the mechanical properties of the steel, making it stronger, more precise in dimensions, and with a smoother surface finish. Cold-drawn bars have a higher tensile strength, better surface finish, and tighter dimensional tolerances compared to hot-rolled bars. They are commonly used in applications where precision and strength are required, such as in automotive components, machinery parts, and construction materials. On the other hand, centerless ground steel round bars are produced by passing a cylindrical steel bar through a grinding machine without the need for centers or support. The grinding process removes surface imperfections and deviations in diameter, resulting in a precise and smooth finish. Centerless ground bars offer excellent dimensional accuracy, surface finish, and roundness. They are often used in applications where precision and tight tolerances are critical, such as in the manufacturing of bearings, shafts, and hydraulic cylinders. In summary, the main difference between a cold-drawn steel round bar and a centerless ground steel round bar lies in the manufacturing process and the resulting properties. Cold-drawn bars are formed by pulling the steel through a die, resulting in improved mechanical properties, tighter tolerances, and a smoother surface finish. Centerless ground bars are produced by grinding the steel to enhance dimensional accuracy, roundness, and surface finish. Both types of bars have their own advantages and are suited for different applications based on the required precision, strength, and surface finish.
- Q: How do you measure the straightness tolerance of a steel round bar?
- To determine the straightness tolerance of a steel round bar, various methods can be employed based on the desired level of accuracy and precision. Below are several commonly used techniques: 1. Visual Inspection: This straightforward approach involves visually examining the bar for any noticeable deviations from straightness. Placing the bar on a flat surface allows for the detection of bends or curves along its length. However, it is worth noting that this method is subjective and may not yield precise measurements. 2. Straightedge Method: Using a straightedge such as a ruler or precision straightedge, one can assess the presence of gaps or spaces between the straightedge and the bar's surface. This method offers a higher level of accuracy but can still be influenced by human error. 3. Dial Indicator Method: By utilizing a dial indicator, a precise measuring tool, the straightness tolerance can be measured. Fixing the dial indicator to a stationary point and moving it along the length of the bar enables the identification of any deviations from a straight line. This method provides more precise measurements and can quantify the straightness tolerance in specific units like inches or millimeters. 4. Laser Measurement: Laser systems, such as laser alignment devices, serve as an effective means of measuring the straightness tolerance of a steel round bar. These systems project a straight line onto the bar's surface using lasers and then analyze any deviations from this line. Laser measurement offers highly accurate and repeatable results, making it suitable for applications requiring strict tolerances. It is essential to consider the required level of accuracy, the size of the round bar, and the available resources and equipment when selecting a measurement method. It is also advisable to consult industry standards and guidelines to ensure compliance with specific tolerances and requirements relevant to your application.
- Q: What is the difference between a bright and a cold finished steel round bar?
- A bright steel round bar refers to a steel bar that has undergone a process called bright drawing, which involves passing the bar through a series of dies to achieve a smooth and shiny surface finish. On the other hand, a cold finished steel round bar is produced by cold drawing, which involves pulling the bar through a die to reduce its diameter and improve its dimensional accuracy. The cold finishing process does not result in a bright and shiny surface like bright drawing does, but it enhances the mechanical properties and overall quality of the bar.
- Q: What are the different types of steel round bar alloys used in the marine industry?
- In the marine industry, various types of steel round bar alloys are used due to their strength, corrosion resistance, and other specific properties required for marine applications. Some of the commonly used steel round bar alloys in the marine industry include: 1. Stainless Steel: Stainless steel, particularly grades like 316 and 304, is extensively used in the marine industry. These alloys have excellent corrosion resistance, making them suitable for marine environments where exposure to saltwater and moisture is common. Stainless steel round bars are also known for their high strength and durability. 2. Carbon Steel: Carbon steel round bars are another commonly used alloy in the marine industry. They are known for their strength and toughness, making them suitable for various marine applications. However, carbon steel is more prone to corrosion compared to stainless steel, so proper maintenance and protective coatings are necessary. 3. Duplex Stainless Steel: Duplex stainless steel round bars, such as SAF 2205, are gaining popularity in the marine industry due to their superior corrosion resistance and high strength. These alloys have a balanced microstructure of ferrite and austenite, providing excellent resistance to pitting, crevice corrosion, and stress corrosion cracking. 4. Copper-Nickel Alloys: Copper-nickel round bars, specifically alloys like 90/10 (90% copper and 10% nickel) and 70/30 (70% copper and 30% nickel), are widely used in the marine industry. These alloys offer excellent resistance to seawater corrosion, erosion, and biofouling. Copper-nickel alloys are commonly used in seawater piping systems, heat exchangers, and condensers. 5. Aluminum Alloys: Although not steel, aluminum round bars are also used in the marine industry, especially for lightweight applications. Aluminum alloys, such as 6061 and 5083, offer good corrosion resistance and high strength-to-weight ratio. They are commonly used in boat building, mast structures, and other marine components. It is important to note that the selection of steel round bar alloys in the marine industry depends on specific application requirements, environmental conditions, and budget considerations. Consulting with marine engineers and industry experts can help in choosing the most appropriate alloy for a particular marine application.
- Q: What is hot rolling? What is called forging?
- Hot rolling is the rolling process at which the temperature is above the recrystallization temperature, so that the finished product is better than cold rolling
- Q: What are the advantages of using creep-resistant steel round bars?
- Using creep-resistant steel round bars in various applications has several advantages. Firstly, these bars offer exceptional resistance to high temperatures and prolonged stress exposure, making them ideal for high temperature environments such as power plants, boilers, and engines. Their ability to maintain their mechanical properties at elevated temperatures is a key advantage. Secondly, these round bars possess superior creep strength, allowing them to endure constant stress over extended periods without deformation or failure. This is particularly crucial in applications where components are subjected to continuous stress, such as pressure vessels or structural machinery. The high creep strength ensures the longevity and reliability of these components. Additionally, creep-resistant steel round bars exhibit excellent corrosion resistance. They are often alloyed with elements like chromium, molybdenum, or nickel, enhancing their ability to resist corrosion in harsh environments. This makes them suitable for industries like oil and gas, chemical processing, and marine applications where corrosion is a significant concern. Furthermore, these round bars possess favorable weldability, facilitating easy fabrication and assembly. They can be welded to other components without compromising their mechanical properties, making them versatile and cost-effective for construction projects. Moreover, these round bars offer dimensional stability and high hardness, guaranteeing that components maintain their shape and mechanical properties even under extreme conditions. This characteristic makes them suitable for applications requiring precision and accuracy, such as aerospace and automotive industries. In conclusion, the advantages of using creep-resistant steel round bars include their ability to withstand high temperatures, superior creep strength, corrosion resistance, weldability, dimensional stability, and high hardness. These advantages make them the preferred choice for various industries where reliability, longevity, and performance under harsh conditions are essential considerations.
- Q: Can steel round bars be hot worked?
- Yes, steel round bars can be hot worked. Hot working refers to the process of shaping or forming steel while it is at an elevated temperature. This temperature is typically above the recrystallization temperature of the steel, which allows for easier deformation and shaping. Hot working of steel round bars can be done through processes such as hot rolling, hot forging, or hot extrusion. These processes involve applying heat to the steel bar and then using mechanical force to shape it into the desired form. Hot working is commonly used in the manufacturing of various steel products, including round bars, to improve their mechanical properties and achieve specific shapes or sizes.
- Q: What is the maximum nickel content allowed for steel round bars?
- The nickel content permitted for steel round bars can vary depending on the specific steel grade and application. Adding nickel to steel generally improves its mechanical properties, such as strength and toughness. However, excessively high nickel content can negatively affect the weldability and machinability of steel. As a result, industry standards and specifications often establish the maximum allowable nickel content for different grades of steel round bars. To determine the specific maximum nickel content allowed for a particular steel grade, it is essential to consult relevant standards and specifications, such as ASTM, AISI, or ISO. These standards offer comprehensive guidelines and restrictions to ensure the quality and suitability of steel round bars for a wide range of applications.
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SCM440 SCM415 SAE4140 Steel Round Bar /AISI 4140 Steel
- Ref Price:
-
- Loading Port:
- China main port
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 5 m.t.
- Supply Capability:
- 100000 m.t./month
OKorder Service Pledge
Quality Product, Order Online Tracking, Timely Delivery
OKorder Financial Service
Credit Rating, Credit Services, Credit Purchasing
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