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: What are the environmental benefits of using steel round bars?: There are several environmental benefits of using steel round bars: 1. Recyclability: Steel is one of the most recycled materials in the world. Using steel round bars reduces the demand for new steel production and saves energy and resources. Additionally, recycling steel reduces the amount of waste sent to landfills, helping to reduce environmental pollution. 2. Durability: Steel round bars are highly durable and have a long lifespan. This means that they do not need to be replaced frequently, reducing the overall consumption of materials. The durability of steel also reduces the need for maintenance and repairs, further reducing environmental impact. 3. Energy efficiency: Producing steel round bars requires less energy compared to other construction materials like concrete or wood. The energy savings are significant throughout the entire life cycle of the product, including extraction, manufacturing, transportation, and installation. 4. Reduced carbon emissions: Steel production emits less carbon dioxide (CO2) compared to other materials. By using steel round bars, we can help reduce greenhouse gas emissions and combat climate change. Furthermore, steel can be produced using alternative energy sources, such as renewable energy, further reducing carbon emissions. 5. Versatility and weight reduction: Steel round bars are versatile and can be used in various construction applications. Their high strength-to-weight ratio allows for the creation of lightweight structures, reducing the amount of material needed. This not only lowers the environmental impact but also decreases transportation costs and fuel consumption during delivery. 6. Fire-resistant properties: Steel round bars are highly resistant to fire, which can help prevent the spread of flames and reduce damage to structures. This property reduces the need for fire retardant chemicals that may have negative environmental impacts. In conclusion, using steel round bars offers numerous environmental benefits, including recyclability, durability, energy efficiency, reduced carbon emissions, weight reduction, and fire resistance. By opting for steel round bars, we can contribute to a more sustainable and eco-friendly construction industry.

Q: How are steel round bars used in the manufacturing of valves and fittings?: Valve and fitting manufacturing commonly utilizes steel round bars for their strength, durability, and versatility. These bars serve as the primary raw material for various valve and fitting components. A significant application of steel round bars in valve manufacturing involves producing valve stems. Valve stems control fluid or gas flow through the valve. The round bars are machined and threaded to create the stem, which connects to the valve disc or plug. Steel round bars are chosen for this purpose due to their high tensile strength, ensuring the stem can withstand the required pressure and torque to operate the valve. In fittings manufacturing, steel round bars are frequently used to produce threaded connectors, nipples, and couplings. These components are integral for joining pipes or tubes, enabling fluid or gas transfer in different systems. Steel round bars are easily machinable, allowing manufacturers to create precise threads and shapes necessary for these fittings. Additionally, steel round bars are also employed in fabricating the body or housing of valves and fittings. The bars can be cut, forged, or machined into the desired shape, providing a robust and dependable structure for the valve or fitting. The use of steel in the body guarantees the component's ability to endure high pressures, temperature fluctuations, and corrosive environments. In conclusion, steel round bars have a crucial role in valve and fitting manufacturing. Their strength, durability, and machinability make them an exceptional choice for creating vital components like valve stems, threaded connectors, and the bodies of valves and fittings.

Q: What are the typical tolerances for steel round bars?: The specific requirements of the application or industry can cause variations in the typical tolerances for steel round bars. However, common standard tolerances are generally accepted. Regarding diameter, the tolerances for steel round bars typically fall within a few thousandths of an inch. This means that the actual diameter of the bar may slightly deviate from the specified diameter, but it will still be within an acceptable range. In terms of straightness, steel round bars are commonly manufactured with a tolerance for some deviation from a perfectly straight line. The usual tolerance for straightness is measured in units of inches per foot or millimeters per meter. This means that the bar may have a slight bend or curve, but it should not exceed the specified tolerance. Surface finish is another important factor for steel round bars. The tolerance for surface finish is usually specified in terms of roughness average (Ra) or surface roughness in micrometers. This tolerance ensures that the bar's surface is smooth and free from significant imperfections, such as pits or scratches. It is important to note that these typical tolerances can vary depending on the specific grade or type of steel used, as well as the intended application. Precision or critical applications may require tighter tolerances, while less demanding applications may accept looser tolerances. Therefore, it is recommended to consult relevant industry standards or specifications to determine the specific tolerances required for a particular steel round bar.

Q: Can steel round bars be used for making drill bits?: Steel round bars cannot be utilized in the production of drill bits. Drill bits necessitate distinct materials and manufacturing techniques to guarantee their endurance and efficacy. Typically, drill bits are crafted from high-speed steel (HSS), cobalt steel, or carbide. These materials are selected for their hardness, heat resistance, and ability to endure the substantial forces and temperatures generated while drilling. Conversely, steel round bars are not purposely designed or manufactured to meet the requirements of drill bits. Implementing steel round bars in the production of drill bits would result in substandard performance, heightened abrasion, and potential fracture during drilling activities. It is imperative to employ drill bits that are specifically designed and manufactured for this purpose to ensure efficient and secure drilling operations.

Q: Can steel round bars be used in the production of musical instruments?: Yes, steel round bars can be used in the production of musical instruments. They are commonly used to make components such as keys, rods, and supports in various instruments such as pianos, xylophones, and various percussion instruments.

Q: What are the different surface roughness options for steel round bars?: The different surface roughness options for steel round bars can vary depending on the manufacturing process and specific requirements. Some common surface finishes for steel round bars include smooth, turned and polished, ground, and rough. These options provide different levels of smoothness and surface texture to meet various industrial and aesthetic needs.

Q: Can steel round bars be used for making electrical components?: No, steel round bars are not typically used for making electrical components. Electrical components are typically made from materials that have good electrical conductivity, such as copper or aluminum.

Q: Can steel round bars be used for making security grilles?: Certainly! Security grilles can be made using steel round bars. Steel, being a sturdy and durable material, offers excellent protection for windows and doors. By welding round bars together, a robust framework for the security grilles can be created. Moreover, steel round bars are highly customizable and can be shaped to fit any size or design requirement, making them suitable for various types of security grilles. The hardness and toughness of steel also make it resistant to cutting or tampering, thereby enhancing the security features of the grilles. All in all, steel round bars are a dependable option for creating security grilles due to their strength, durability, and customization capabilities.

Q: How are steel round bars used in the construction of bridges and buildings?: Steel round bars are widely used in the construction of bridges and buildings due to their strength, durability, and versatility. These bars are typically made of carbon steel and have a circular cross-section, making them perfect for structural applications. In bridge construction, steel round bars are commonly used for reinforcing concrete structures. They are often embedded within concrete beams, columns, and slabs to enhance their load-bearing capacity and resist bending and shearing forces. The bars are placed strategically in the concrete to provide tensile strength, which complements the compressive strength of the concrete. This reinforcement ensures that the bridge can withstand heavy loads and traffic while maintaining its structural integrity. Similarly, in building construction, steel round bars play a crucial role in reinforcing concrete structures. They are commonly used in the construction of columns, beams, and foundations to increase their load-carrying capacity and prevent structural failure. The bars are typically added to the concrete during the pouring process, forming a sturdy framework that enhances the building's strength and stability. Moreover, steel round bars are also used to create steel frames in the construction of buildings. These frames provide the skeletal structure of the building and support the weight of the floors, walls, and roofs. Steel round bars, due to their high strength-to-weight ratio, are ideal for creating lightweight yet robust frames that can withstand various loads, including wind and seismic forces. Additionally, steel round bars are used for other purposes in construction, such as the fabrication of steel reinforcements, connectors, and fasteners. They can be welded, bolted, or threaded to join different structural elements together, ensuring a secure and sturdy construction. Overall, steel round bars are an essential component in the construction of bridges and buildings. They provide the necessary strength, durability, and flexibility required to create structurally sound and long-lasting structures.

Q: What is the mechanical properties of No. 40 round bar?: 40# stands for steel grades, round bars for steel profiles, mechanical properties for steels, tensile strength, yield point, (cattle / mm, 2) elongation, shrinkage (%), impact energy, Ak (coke), state, hardness, HB<

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