cold round bar and gb

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Loading Port:: China Main Port

Payment Terms:: TT OR LC

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Product Description:

Specifications of Wire Rod Q235:

Steel Grade: Q235, Standard: GB Diameter: 5.5mm, 6.5mm, 7mm,8mm,9mm,10mm,12mm,14mm

Diameter Tolerance:±0.3mm 6.5mm can be drawing into 2mm/8.0mm can be drawing into 3mm

Please kindly find our chemistry of our material based on Q235 as below for your information

Trademark	Rank	Chemical composition (quality score) %
		C	Si	Mn	S	P
		C	Si	Mn	S	P
			≤		≤	≤
Q235	A	0.14-0.22	0.30	0.30-0.65	0.050	0.045
Q235	B	0.12-0.20	0.30	0.30-0.70	0.045	0.045
Trademark	Rank	Pulling Test
		Bend PointΔs/Mpa		Tensile Strength	Elongation Ratioδ5%
					Elongation Ratioδ5%
		Thickness (Diameter) /MM			Thickness (Diameter) /MM
		≤16	16-40		≤16	16-40
		≥			≥
Q235	A	235	225	375-500	26	25
Q235	B	235	225	375-500	26	25

Usage and Applications of Wire Rod Q235:

After hot-rolled the products shaped into coil and delivery as finished product, including round, square, rectangular, hexagonal and so on. Since most of the products are round, it is generally called wire rod. Carbon steel wire rod is widely used in construction and manufacturing. Carbon steel wire rod is mainly used for reinforcement of reinforced concrete and welded structure or reprocessed (roberts , nail, etc.) materials, especially used to produce wire drawing, welding electrode, nails, spring, electronic, precise machinery parts and so on.

Packaging & Delivery of Wire Rod Q235:

Packaging Detail: products are packed in coil and then shipped by container or bulk vessel

Each coil weight: 2-3MT

Delivery Detail: within 45 days after received deposit or LC.

Label: to be specified by customer, generally, each bundle has 1-2 labels

Trade terms: FOB, CFR, CIF

Q: Can steel round bars be used in the manufacturing of office furniture?: Office furniture can indeed utilize steel round bars. Steel, being a versatile and enduring material, can be molded into various shapes, including round bars. These bars are useful as structural elements in office furniture, such as table legs, chair frames, and support beams. They provide the furniture with strength and steadiness, making them suitable for heavy usage in office settings. Furthermore, steel can be finished in diverse manners, such as powder coating or chrome plating, to enhance its appearance and match the office space's aesthetic. All in all, the utilization of steel round bars in the production of office furniture offers both durability and stability, while also providing a contemporary appearance.

Q: How do you store and handle steel round bars?: Steel round bars should be stored in a dry and covered area to protect them from moisture and corrosion. They should be stacked horizontally on a flat surface, with spacers in between each layer to prevent deformation. When handling steel round bars, it is important to wear appropriate protective gear such as gloves and safety shoes. They should be lifted using proper lifting equipment, ensuring that the load is evenly distributed. Additionally, bars should not be dragged or rolled on the ground to avoid scratches or damage.

Q: What is the difference between the heat treatment of cold drawn round steel and the heat treatment of wrought round steel?: Solution treatment: the alloy can be dissolved in various phases, strengthening solid solution, improving toughness and corrosion resistance, eliminating stress and softening, so as to continue processing and forming.

Q: What are the different heat treatment processes for steel round bars?: There are several heat treatment processes for steel round bars, including annealing, normalizing, quenching, tempering, and hardening. Annealing involves heating the steel to a specific temperature and then slowly cooling it to relieve internal stresses and improve its machinability. Normalizing is a similar process, but the cooling is done in still air to achieve a more uniform structure. Quenching involves rapidly cooling the steel from a high temperature to increase its hardness, while tempering is a subsequent process that reduces the brittleness caused by quenching through controlled reheating. Hardening is a process that involves heating the steel to a high temperature and then rapidly cooling it to achieve maximum hardness.

Q: Are steel round bars available in different surface finishes?: Yes, steel round bars are available in different surface finishes. The surface finish of a steel round bar refers to the treatment or coating applied to the surface to enhance its appearance, protect it from corrosion, or improve its performance in specific applications. Common surface finishes for steel round bars include polished, brushed, mill finish, galvanized, and coated with materials like chrome, nickel, or zinc. These different surface finishes cater to various requirements and preferences in terms of aesthetics, protection against corrosion, and functionality in different industries and applications.

Q: What kind of material is the first round steel?: Standard Specification for hot rolled round steel is 5.5-250 mm. Where: 5.5-25 mm small round steel mostly straight bundles of supply, used for steel, bolts and various mechanical parts; greater than 25 mm round steel, seamless steel pipe is mainly used for the manufacture of mechanical parts of the tube, etc..

Q: What are the different types of surface defects in steel round bars?: Steel round bars can have different types of surface defects, which can vary in severity and affect the quality and performance of the bars. Common surface defects include: 1. Scale: During manufacturing, an oxide layer called scale can form on the surface of the steel. Scale appears as a rough, flaky layer and negatively affects the bar's appearance and surface finish. 2. Pits: Small depressions or cavities can occur on the bar's surface due to corrosion, mechanical damage, or manufacturing defects. Pits weaken the bar's structural integrity and increase the risk of failure. 3. Scratches: Shallow grooves or marks can be caused by handling, transportation, or contact with other objects during manufacturing. While scratches may not significantly impact the bar's strength, they do affect its appearance and surface finish. 4. Cracks: Linear fractures on the bar's surface can result from excessive stress, thermal cycling, or manufacturing defects. Cracks are extremely harmful to the bar's strength and integrity and can lead to catastrophic failure if not addressed. 5. Decarburization: Loss of carbon from the steel bar's surface layer, which can occur during heating or cooling processes. This process results in a softer and weaker surface layer, reducing the bar's overall strength and durability. 6. Lamination: Separation or delamination of layers within the steel bar, caused by improper bonding or rolling conditions during manufacturing. Lamination weakens the bar's structural integrity and increases the likelihood of failure. 7. Inclusions: Non-metallic particles or impurities present on the bar's surface, caused by contaminants in raw materials or improper manufacturing processes. Inclusions negatively impact the bar's mechanical properties and performance. To ensure the quality and performance of steel round bars, it is crucial to identify and address these surface defects. Various inspection and testing methods can be used, such as visual inspection, ultrasonic testing, magnetic particle inspection, and dye penetrant inspection.

Q: What is the difference between a bright and a black steel round bar?: The main difference between a bright and a black steel round bar lies in their appearance and surface finish. A bright steel round bar, also known as a bright drawn or turned bar, has a smooth and shiny surface. This is achieved through a process called cold drawing, where the steel bar is pulled through a die to remove any imperfections and create a uniform shape. The result is a highly polished and reflective surface that is visually appealing. On the other hand, a black steel round bar has a dark, rough, and non-reflective surface. This is because it does not undergo the same cold drawing process as a bright steel bar. The black surface is typically a result of the scale that forms on the steel during the manufacturing process, which is not removed. In terms of properties, both bright and black steel round bars are made of the same material, typically carbon steel. Therefore, their mechanical properties such as strength, hardness, and toughness are generally similar. However, the manufacturing process of the bright steel bar helps to improve its surface quality and dimensional accuracy compared to the black steel bar. Ultimately, the choice between a bright and a black steel round bar depends on the desired aesthetic appearance and the specific application requirements. Bright steel bars are commonly used in decorative applications, where a polished and visually appealing finish is desired. Black steel bars, on the other hand, are often used in structural applications, where the surface appearance is less important but strength and durability are crucial.

Q: What are the main differences between wrought round steel, hot rolled round steel and cold drawn round steel? Where are they used separately?: Round steel three processing methods are more common, should be very wide surface. Hot rolled round steel, used in construction and general hardware parts processing is very common.

Q: What are the different types of steel round bar alloys?: Some of the different types of steel round bar alloys include carbon steel, alloy steel, stainless steel, tool steel, and high-speed steel.

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