Hot Rolled Mild Steel Round Bar Q235 Q345 Q235B Q345B

Hot Rolled Mild Steel Round Bar Q235 Q345 Q235B Q345B System 1

Hot Rolled Mild Steel Round Bar Q235 Q345 Q235B Q345B System 2

Hot Rolled Mild Steel Round Bar Q235 Q345 Q235B Q345B System 3

Hot Rolled Mild Steel Round Bar Q235 Q345 Q235B Q345B System 4

Hot Rolled Mild Steel Round Bar Q235 Q345 Q235B Q345B

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Loading Port:: China main port

Payment Terms:: TT OR LC

Min Order Qty:: 25 m.t.

Supply Capability:: 10000 m.t./month

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Diameter(mm)	Φ6 ,Φ8,Φ10,Φ12,Φ13,Φ14,Φ16,Φ18,Φ20,Φ22,Φ25,Φ28,Φ32,
Length(m)	Unfolded / Straight Bundles weighing upto 2 Metric Tons and lengths is 6 Meters upto 15 Meters or according customers require
U Shaped folded Bundles weighing up to 2 Metric Tons and lengths is 12 Meters
Rounded Coils ~ up to 2 Metric Ton Coils for Bending / Cutting Machine use.
Standard	GB(HRB335/HRB400/HRB500);
BS4449 -1997 GRADE 250B, 460B; BS4449-2005 GRADE 500B;
ASTM A615 GRADE 40,GRADE60,GRADE75; ASTM A706;
DIN488-1 420S/500S, BST500S
JIS G3112 SD35, SD40, SD50,SD390
NFA 35016 FE E 400, FE E 500
CA 50/60
GOST A3 R A500C
Surface finished	Screw-thread
Epoxy coating
Galvanized coating
Production facility	Imports of production equipment from Italy
Production capacity	50,000 MT/month
Payment term	T/T or 100% L/C at sight
Package	By bundles. One bundles about 2-3tons

Dia mm	Theoretical weight kg/m	Dia mm	Theoretical weight kg/m
12	0.888	25	6.85
14	1.21	28	4.83
16	1.58	29	5.06
18	2.00	32	6.31
19	2.235	36	7.99
20	2.47	40	9.87
22	2.98	50	15.42

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: How are steel round bars stored and transported?: Steel round bars are typically stored in warehouses or storage facilities. They are often stacked horizontally on racks or placed in designated storage areas. To prevent damage and ensure easy accessibility, bars of different sizes or grades are segregated and labeled accordingly. When it comes to transportation, steel round bars are commonly loaded onto flatbed trucks or shipping containers, depending on the quantity and distance of the shipment. To prevent movement and potential damage during transit, bars are secured using straps or other fastening methods. Additionally, protective coatings or wrapping materials may be applied to safeguard against corrosion or moisture. Overall, proper storage and transportation practices are crucial to maintain the quality and integrity of steel round bars.

Q: Can steel round bars be used in manufacturing equipment?: Yes, steel round bars can be commonly used in manufacturing equipment due to their high strength, durability, and versatility. They are often utilized as structural components, axles, shafts, and other critical parts in various industries such as automotive, construction, and machinery.

Q: What is the difference between a seamless and a turned steel round bar?: A seamless steel round bar is produced by piercing a solid billet to create a hollow tube, which is then elongated and rolled to the desired size. This manufacturing method ensures a smooth and continuous surface, without any seams or welds. On the other hand, a turned steel round bar is a solid bar that undergoes machining operations to achieve the desired shape and dimensions. It is typically produced from a larger steel bar by removing material through turning or machining processes. Therefore, the main difference lies in the manufacturing process, with seamless round bars being hollow and formed through extrusion, while turned round bars are solid and shaped through machining operations.

Q: What are the advantages of using precipitation-hardening steel round bars?: Using precipitation-hardening steel round bars in various applications has several advantages. Firstly, these bars provide exceptional strength and hardness, making them suitable for industries that require robust and durable materials. The precipitation-hardening process involves heat treatment, which enhances the steel's strength and resistance to wear, deformation, and fatigue. Secondly, precipitation-hardening steel round bars exhibit excellent corrosion resistance. This makes them ideal for applications in marine environments or industries where exposure to harsh chemicals or corrosive substances is common. The steel's resistance to corrosion ensures the longevity and reliability of components or structures made from it. Another advantage is the versatility of these bars. They can be easily machined, welded, and forged, allowing for flexibility in design and fabrication processes. This makes them suitable for a wide range of applications, including aerospace, automotive, construction, and oil and gas industries. Furthermore, precipitation-hardening steel round bars offer good dimensional stability. Their low rates of thermal expansion mean they retain their shape and size even under extreme temperature variations. This characteristic is particularly important in precision engineering or tool manufacturing, where dimensional accuracy and stability are crucial. Lastly, the availability of a wide range of grades and sizes of precipitation-hardening steel round bars makes it easier to find the most suitable option for specific requirements. Different grades offer varying levels of strength, toughness, and corrosion resistance, allowing for tailored solutions to meet different application needs. Overall, the advantages of using precipitation-hardening steel round bars include exceptional strength, corrosion resistance, versatility, dimensional stability, and availability in various grades. These advantages make them the preferred choice for many industries requiring high-performance and durable materials.

Q: Can steel round bars be used for shafts or axles?: Yes, steel round bars can be used for shafts or axles. Steel round bars are commonly used for these applications due to their high strength, durability, and ability to withstand heavy loads and torsional forces. They can be machined and shaped to fit specific requirements, making them suitable for various industrial and mechanical applications.

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 help improve cleanliness. Some common finishes include hot rolled, cold drawn, turned and polished, and ground finishes. These finishes remove surface impurities and provide a smoother and cleaner surface, making the steel round bar more suitable for various applications.

Q: What are the different alloying elements used in steel round bars?: There are several alloying elements that can be used in the production of steel round bars. These elements are added to enhance the properties of the steel and improve its strength, durability, and other specific characteristics. Some of the commonly used alloying elements in steel round bars include: 1. Carbon: Carbon is the primary alloying element in steel and helps to increase its hardness and strength. The carbon content in steel round bars usually ranges from 0.2% to 2.1%. 2. Chromium: Chromium is added to steel to improve its resistance to corrosion and oxidation. It also enhances the steel's hardness, strength, and wear resistance. Stainless steel round bars often contain chromium as a major alloying element. 3. Nickel: Nickel is commonly used in stainless steel round bars to improve their corrosion resistance and enhance their mechanical properties. It also increases the toughness and strength of the steel. 4. Manganese: Manganese is added to steel to improve its hardenability, strength, and wear resistance. It also contributes to the steel's ability to withstand impact and shock loading. 5. Molybdenum: Molybdenum is often used in steel round bars to enhance their strength, toughness, and resistance to corrosion. It also improves the steel's high-temperature strength and creep resistance. 6. Vanadium: Vanadium is added to steel to improve its strength, toughness, and wear resistance. It also helps in refining the steel's grain structure, which enhances its mechanical properties. 7. Tungsten: Tungsten is used in steel round bars to increase their hardness, strength, and resistance to wear and corrosion. It also improves the steel's high-temperature strength and toughness. 8. Silicon: Silicon is added to steel to improve its strength, hardness, and resistance to oxidation. It also helps in deoxidizing the steel during the manufacturing process. 9. Copper: Copper is sometimes used as an alloying element in steel to improve its corrosion resistance, thermal conductivity, and electrical conductivity. These are just some of the alloying elements that can be used in steel round bars. The specific combination and proportion of these elements depend on the desired properties of the steel and the intended application of the round bars.

Q: What are the different types of steel round bar surface treatments used in the automotive industry?: In order to enhance the performance, durability, and aesthetics of components in the automotive industry, various surface treatments are utilized for steel round bars. Some commonly employed treatments include: 1. Phosphating: Widely used, this treatment involves the application of a phosphate coating onto the steel round bar. Its purpose is to improve corrosion resistance and establish a suitable foundation for further coatings or paints. 2. Galvanizing: Another method is to apply a layer of zinc onto the surface of the steel round bar. This treatment offers excellent corrosion resistance and extends the lifespan of the component. 3. Electroplating: By utilizing an electric current, a thin layer of metal, such as chrome or nickel, is deposited onto the steel round bar's surface. This treatment enhances appearance, provides corrosion resistance, and improves wear resistance. 4. Powder coating: A popular technique involves the application of a dry powder onto the surface of the steel round bar, followed by heating to form a protective coating. This treatment ensures exceptional durability, corrosion resistance, and can be customized with different colors and finishes. 5. Anodizing: Typically used for aluminum components, anodizing can also be applied to steel round bars in specific cases. This treatment involves the creation of an oxide layer on the surface, resulting in improved corrosion resistance and enhanced appearance. 6. Black oxide coating: A chemical treatment that produces a blackened surface on the steel round bar. This treatment offers corrosion resistance, improved aesthetics, and can serve as a lubricant in certain applications. It is crucial to consider the specific requirements of the automotive component, including environmental conditions, desired appearance, and functional properties when selecting the appropriate surface treatment. Manufacturers meticulously choose the most suitable treatment to ensure optimal performance and longevity of steel round bars in the automotive industry.

Q: Can steel round bars be plated or coated?: Yes, steel round bars can be plated or coated. Plating or coating is a common practice used to enhance the appearance, durability, and corrosion resistance of steel round bars. The plating or coating process involves applying a layer of another material onto the surface of the steel round bars. This can be done through various methods such as electroplating, hot-dip galvanizing, powder coating, or painting. The chosen plating or coating material depends on the specific requirements and desired properties of the steel round bars. For example, zinc plating is commonly used to provide corrosion resistance, while chrome plating can enhance the aesthetic appeal. Overall, plating or coating steel round bars can significantly improve their performance and extend their lifespan.

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