Quenched and Tempered Steel SAE4140 SAE4145 SAE4340 SCM440 42CrMoS4 708M40 Steel Round Bar

Quenched and Tempered Steel SAE4140 SAE4145 SAE4340 SCM440 42CrMoS4 708M40 Steel Round Bar System 1

Quenched and Tempered Steel SAE4140 SAE4145 SAE4340 SCM440 42CrMoS4 708M40 Steel Round Bar System 2

Quenched and Tempered Steel SAE4140 SAE4145 SAE4340 SCM440 42CrMoS4 708M40 Steel Round Bar System 3

Quenched and Tempered Steel SAE4140 SAE4145 SAE4340 SCM440 42CrMoS4 708M40 Steel Round Bar System 4

Quenched and Tempered Steel SAE4140 SAE4145 SAE4340 SCM440 42CrMoS4 708M40 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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Material	4140
Chemical Composition	Mechanical Properties(In Quenched & Tempered State)
C	0.38-0.45	Tensile strength(MPA)	≥1080
Si	0.17-0.37	Yield strength (MPA)	≥930
Mn	0.50-0.80	Elongation(δ5/%)	12
Cr	0.90-1.20	Reduction in Area (ψ/%)	45
Mo	0.15-0.25	Impact (J)	63
P	≤0.035	Hardness	≤217HB
S	≤0.035
Cu	≤0.30
Ni	≤0.30

USA	Japanese	Gemany	British	France	International	Chinese
ASTM&AISI&SAE	JIS	EN DIN	EN BS	EN NF	ISO	GB
4140	SCM440	42CrMo4 1.7225	42CrMo4 1.7225	42CrMo4 1.7225	------	42CrMo

Material	4140 steel round bar
Size	Diameter:20mm-1000mm Length:500mm-6000mm
Origin place	Made In China
Delivery Condition	Hot rolled,cold drawn,forged
Surface require	Black,grinding,bright,polish
Heat treatment	Quenched,Tempered,annealed
Packing	seaworthy packing ,wooden case ,carton,woven bag or at client's requires
Delivery time	In 10-50 days
Trade Term	EXW,FOB,CIF
Payments	T/T or L/C at sight
Port	China main Port,such as shanghai,Dalian,Shenzhen port.
MOQ	1 Ton

Alloy Steel	4140, 4142, 42CrMo4, 1.7225, SCM440, 4130, SCM430, 25CrMo4, 1.7218, 34CrNiMo6, 1.6582, 4340, SNCM439, 36CrNiMo4, 1.6511, SACN645, 1340, SMn438, SNC236,
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,

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: Can steel round bars be used in the electronics industry?: Steel round bars can be used in the electronics industry, but their applications are generally limited. While steel is a strong and durable material, it is not typically utilized in electronic components or circuitry due to its electrical conductivity properties. In the electronics industry, materials with high electrical conductivity, such as copper or aluminum, are usually preferred. These materials allow for efficient transmission of electrical signals and minimize losses. However, steel round bars can find some applications in the electronics industry. They can be used for structural purposes, such as providing support or reinforcement to electronic equipment or enclosures. Steel bars can also be utilized in the manufacturing of various mechanical components, connectors, or fixtures used in electronics assembly. Additionally, steel round bars can be employed in the construction of equipment racks, shelves, or storage systems for electronic devices. Overall, while steel round bars may not be directly involved in the electrical aspects of the electronics industry, they can still serve important functions in terms of structural support and mechanical components.

Q: What are the different surface hardness options for steel round bars?: Steel round bars can have varying levels of surface hardness depending on the specific requirements and applications. Some of the different surface hardness options for steel round bars include: 1. Soft or annealed: This is the lowest level of surface hardness, where the steel is heated and then slowly cooled to reduce internal stress and increase ductility. Soft or annealed steel is easier to machine and form but has lower strength and wear resistance. 2. Normalized: Normalizing involves heating the steel to a specified temperature and then cooling it in air. This process refines the grain structure and improves the mechanical properties of the steel, resulting in increased hardness compared to annealed steel. 3. Quenched and tempered: This is a heat treatment process that involves heating the steel to a high temperature and then rapidly cooling it in a quenching medium like oil or water. The rapid cooling hardens the surface of the steel, while the subsequent tempering process reduces internal stresses and increases toughness. Quenched and tempered steel round bars have high hardness and strength, making them suitable for applications that require resistance to wear and impact. 4. Induction hardened: Induction hardening is a surface hardening process that involves heating only the surface of the steel round bar using an induction coil. This localized heating is followed by rapid quenching, resulting in a hardened surface layer with increased wear resistance. The core of the steel remains unaffected, retaining its toughness. 5. Case hardened: Case hardening, also known as carburizing, involves introducing carbon into the surface layer of the steel round bar. This is typically done by exposing the steel to a carbon-rich gas or by heating it with a carbon-containing material. The carbon diffuses into the surface and increases the hardness, while the core remains relatively softer. Case hardened steel round bars have a tough core with a wear-resistant surface. These are just a few of the different surface hardness options available for steel round bars. The choice of hardness will depend on the specific application requirements, such as strength, wear resistance, and toughness needed for the intended use.

Q: What are the advantages of using mild steel round bars?: There are several advantages of using mild steel round bars. Firstly, mild steel is a cost-effective material, making it an economical choice for various applications. Secondly, mild steel round bars have good weldability, making them easy to join and fabricate into different shapes and structures. Additionally, mild steel round bars offer excellent strength and durability, making them suitable for construction projects and other heavy-duty applications. Furthermore, mild steel has good resistance to corrosion, which enhances its longevity and reduces the need for maintenance. Lastly, mild steel is readily available and widely used, allowing for easy sourcing and compatibility with existing materials and equipment.

Q: Can steel round bars be used in the manufacturing of mining equipment?: Yes, steel round bars can be used in the manufacturing of mining equipment. Steel round bars are commonly used in the construction industry due to their high strength and durability. They can be easily machined, welded, and fabricated into various shapes and sizes, making them suitable for a wide range of mining equipment. Steel round bars can be used to manufacture components such as shafts, axles, gears, and structural supports in mining machinery. Their ability to withstand heavy loads and harsh environments makes them ideal for mining equipment that operates in rugged conditions. Additionally, steel round bars can be heat-treated to enhance their mechanical properties, further increasing their suitability for mining equipment manufacturing.

Q: Can steel round bars be used in corrosive environments?: Steel round bars can be used in corrosive environments, but their suitability depends on the specific type of steel and the severity of the corrosion. Stainless steel round bars, for example, are known for their excellent corrosion resistance and are commonly used in corrosive environments such as marine applications, chemical processing plants, and wastewater treatment facilities. These bars are typically alloyed with elements like chromium and nickel, which form a protective layer on the steel surface, preventing corrosion. However, carbon steel round bars are more prone to corrosion and may not be suitable for highly corrosive environments without proper coatings or treatments. In such cases, it is important to consult with experts or engineers to select the appropriate steel grade and take necessary precautions to ensure the longevity and performance of steel round bars in corrosive environments.

Q: What is the difference between a rough turned and a centerless ground steel round bar?: A rough turned steel round bar is a type of steel bar that has been partially machined to remove excess material and create a rough surface finish. It undergoes a turning process on a lathe, which removes the outer layer of the steel bar to achieve a specific diameter and shape. On the other hand, a centerless ground steel round bar is a type of steel bar that has undergone a precise grinding process to achieve a smooth and polished finish. This process involves feeding the steel bar through a centerless grinder, which removes any imperfections or irregularities on the outer surface, resulting in a consistently smooth and uniform diameter. In summary, the main difference between a rough turned and a centerless ground steel round bar lies in the level of surface finish and precision. Rough turned bars have a rougher surface finish and are not as precisely sized as centerless ground bars, which have a smooth, polished finish and are manufactured with tighter tolerances.

Q: How is the weight of a steel round bar calculated?: The weight of a steel round bar is calculated using the formula: weight = volume × density. The volume of a round bar is determined by multiplying the cross-sectional area (πr^2) with the length of the bar. The density of steel is usually known, so by plugging in these values, we can calculate the weight of the steel round bar.

Q: How do you calculate the fatigue strength of a steel round bar?: Various methods can be employed to calculate the fatigue strength of a steel round bar. For instance, the stress-life (S-N) curve approach or the strain-life (ε-N) curve approach can be utilized. The stress-life (S-N) curve approach entails plotting the stress amplitude (S) against the number of cycles to failure (N) on a log-log scale. By subjecting multiple specimens of the steel round bar to different stress levels and measuring the number of cycles to failure for each stress level, the S-N curve can be obtained. The fatigue strength of the steel round bar can then be determined by identifying the stress level at which the desired number of cycles to failure is achieved, commonly known as the endurance limit. On the other hand, the strain-life (ε-N) curve approach involves plotting the strain amplitude (ε) against the number of cycles to failure (N) on a log-log scale. Similar to the S-N curve approach, multiple specimens of the steel round bar are subjected to different strain levels, and the number of cycles to failure is recorded. By utilizing the strain-life curve, the fatigue strength can be determined by identifying the strain level corresponding to the desired number of cycles to failure. It should be emphasized that calculating the fatigue strength of a steel round bar necessitates conducting fatigue tests on representative specimens under controlled conditions. These tests involve subjecting the specimens to cyclic loading, typically in the form of tension-compression cycles, and recording the number of cycles to failure. The data obtained from these tests is then utilized to construct the S-N curve or the ε-N curve, which offers valuable insights into the fatigue behavior and strength of the steel round bar.

Q: What are the typical dimensions of a steel round bar?: The typical dimensions of a steel round bar can vary depending on the specific application and industry requirements. However, in general, steel round bars are commonly available in diameter sizes ranging from 1/4 inch to 24 inches. These dimensions are often measured in increments of 1/8 inch or 1/4 inch. The length of a steel round bar is typically standardized at 20 feet, although shorter lengths may also be available. It is important to note that these dimensions can vary significantly depending on the specific grade and type of steel being used, as well as the manufacturing process. Therefore, it is essential to consult the appropriate industry standards or consult with a supplier to determine the exact dimensions needed for a particular project.

Q: What are the advantages of using silicon-alloy steel round bars?: There are several advantages of using silicon-alloy steel round bars. Firstly, silicon-alloy steel has enhanced strength and durability, making it suitable for demanding applications and heavy-duty industries. Secondly, the addition of silicon improves the steel's resistance to corrosion and oxidation, increasing its lifespan and reducing maintenance costs. Additionally, silicon-alloy steel round bars offer excellent heat resistance, making them ideal for high-temperature environments. Furthermore, these round bars have good machinability and weldability, allowing for easy fabrication and customization. Overall, the advantages of silicon-alloy steel round bars include increased strength, improved corrosion resistance, enhanced heat resistance, and ease of fabrication.

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