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For fabricators, builders, and industrial buyers who need steel that stays straight, strong, and rust-free under real working conditions, the Hot Rolled and Galvanized Steel Flat Bar from Tianjin YuJie Steel Pipe Trading Co., Ltd. is a proven backbone for hundreds of structural and manufacturing tasks. This flat bar combines the raw load-bearing strength of hot rolled steel with a tightly bonded zinc coating, giving you a material that resists corrosion, welds cleanly, and arrives on site ready to cut, drill, and install. Whether you are reinforcing a concrete slab, producing heavy equipment brackets, building outdoor support frames, or fabricating repair parts, this product is designed to reduce rework, lower labor costs, and keep your project moving forward without material-related delays.
Hot Rolled and Galvanized Steel Flat Bar is a rectangular steel section with flat faces and clean, square edges. The hot rolling process shapes the steel at high temperatures, which improves formability, relieves internal stresses, and creates a uniform grain structure throughout the bar. After rolling, the steel is cleaned, fluxed, and immersed in molten zinc. The result is a metallurgically bonded galvanized layer that shields the underlying steel from moisture, chemicals, and mechanical abrasion. Tianjin YuJie Steel Pipe Trading Co., Ltd. supplies this product in a wide range of thicknesses, widths, and lengths so you can match the exact demands of your drawings without paying for unnecessary modifications or accepting off-spec substitutes.
Many teams struggle with steel that arrives warped, undersized, or with a zinc layer that flakes off during normal cutting and drilling. Others deal with suppliers who cannot hold tolerances, forcing costly field adjustments or complete rejection of material. These problems slow down production, raise labor costs, and damage project timelines. The Hot Rolled and Galvanized Steel Flat Bar from Tianjin YuJie Steel Pipe Trading Co., Ltd. addresses these issues at the source. Each bundle is inspected for straightness, dimensional accuracy, and coating integrity before it leaves the warehouse. The zinc layer is thick enough to protect in outdoor and high-humidity environments yet smooth enough for clean welds and reliable paint adhesion when additional finishing is required.
| Property | Typical Value | Notes |
|---|---|---|
| Material | Q195, Q235, Q345, SS400, A36, S235JR, S355JR | Custom grades available on request |
| Thickness | 3 mm – 30 mm | Common sizes: 3x20, 4x25, 5x30, 6x40, 8x50, 10x60 mm |
| Width | 10 mm – 200 mm | Custom widths up to 300 mm possible |
| Length | 5.8 m, 6 m, 11.8 m, 12 m | Cut-to-length service available |
| Zinc coating | 40 – 85 µm (approx. 275 – 600 g/m²) | Hot-dip galvanized to ASTM A123 / ISO 1461 or as agreed |
| Tensile strength | 370 – 630 MPa depending on grade | Mill test certificates provided with each order |
| Yield strength | ≥ 235 MPa for Q235 / S235JR | Higher grades offer greater yield strength |
| Elongation | ≥ 22% for mild steel grades | Good formability for bending and shaping |
| Packing | Bundled with steel straps, waterproof wrapping optional | Custom marking and labeling available |
The Hot Rolled and Galvanized Steel Flat Bar is extremely versatile. It appears in building frames, handrails, bracing plates, cable trays, and equipment supports. In agriculture, it is used for gate hinges, livestock pen frames, machinery guards, and fence post brackets. In solar energy projects, it supports panel mounting structures that must withstand years of sun, rain, wind, and temperature swings. Electrical contractors use it for grounding strips, bus bar supports, and cable ladder systems. Machinists and fabricators keep it in stock for custom brackets, base plates, shims, and repair jobs because it cuts, drills, and welds efficiently without requiring special preparation.
Many flat bars on the market are galvanized after cutting, leaving exposed edges that rust quickly. Others are cold rolled and then electro-galvanized, which gives a thinner, less durable coating that can wear through during handling. The Hot Rolled and Galvanized Steel Flat Bar supplied by Tianjin YuJie Steel Pipe Trading Co., Ltd. follows a hot-dip galvanizing process that covers the entire bar, including edges and cut ends when specified. The base material is selected from reputable mills, and every shipment includes mill test certificates and coating inspection reports. This transparency gives engineers and buyers confidence that the product will perform as specified on the drawing, not just on paper.
When steel arrives straight, clean, and correctly sized, crews can move faster. Welders spend less time grinding and clamping. Project managers avoid delays caused by rejected material or rework. Maintenance teams enjoy longer service intervals because the galvanized layer keeps rust from spreading at connection points, bolted joints, and cut edges. The Hot Rolled and Galvanized Steel Flat Bar from Tianjin YuJie Steel Pipe Trading Co., Ltd. supports better-looking finished work, lower total installed cost, and fewer callbacks. It is a material choice that quietly improves the reliability of the entire build, from the first lift to the final inspection.
Hot-dip galvanizing is more than a surface treatment. When the flat bar is immersed in molten zinc at around 450°C, a series of zinc-iron alloy layers form. These layers are harder than the base steel and provide excellent abrasion resistance. The outer pure zinc layer gives the familiar bright or matte gray appearance and acts as a sacrificial anode. If the coating is scratched, the surrounding zinc continues to protect the exposed steel electrochemically. This self-healing behavior is critical for outdoor structures, agricultural equipment, and marine environments where painted or electro-galvanized products quickly fail. The Hot Rolled and Galvanized Steel Flat Bar from Tianjin YuJie Steel Pipe Trading Co., Ltd. uses this proven process to extend service life to 30 years or more in many atmospheric conditions.
Working with galvanized steel requires a few simple adjustments. Use ventilation or fume extraction when welding to avoid inhaling zinc oxide fumes. Remove the zinc layer locally before welding if the weld quality is critical, then re-apply a zinc-rich paint or spray to the weld area. For cutting, standard band saws, chop saws, and plasma cutters work well. The galvanized layer may produce slightly more smoke during cutting, so keep the work area well ventilated. Drilling and tapping are straightforward, but use sharp tools to prevent smearing zinc into the hole. If you plan to paint the flat bar, use a primer designed for galvanized surfaces after light surface profiling. These small steps help you get the full benefit of the product without compromising safety or finish quality.
When comparing suppliers, pay attention to more than just price per ton. Ask about the zinc coating standard and whether the bars are hot-dip galvanized or electro-galvanized. Check if the supplier provides full-length mill test certificates and coating thickness reports. Verify the dimensional tolerances for thickness and width, especially if your project involves automated feeding or precise fit-up. Consider whether the supplier can cut to length and bundle to your required weight. Tianjin YuJie Steel Pipe Trading Co., Ltd. welcomes these questions and provides documented answers with every quotation. Our Hot Rolled and Galvanized Steel Flat Bar is supplied with clear specifications, so you know exactly what will arrive on site before you commit.
Every lot of Hot Rolled and Galvanized Steel Flat Bar is checked for visual surface defects, zinc adhesion, thickness, width, straightness, and length. The product is packed in bundles with steel straps and often wrapped with waterproof tarpaulin for ocean freight or long-term outdoor storage. Edge protectors and wooden battens can be added for long lengths to prevent bending during transport. Labels include heat number, size, grade, coating standard, and order reference, so traceability is maintained from the mill to your warehouse. This attention to packing and labeling reduces damage claims and makes receiving inspection faster.
Getting the right Hot Rolled and Galvanized Steel Flat Bar is straightforward. Start with the required thickness, width, length, and steel grade. Provide the coating standard if you know it, or describe the exposure environment so our team can recommend the right zinc weight. Indicate the total quantity and whether you need cut-to-length pieces or standard mill lengths. We will return a detailed quotation with lead time, packing method, and shipping options. Once the order is confirmed, production begins, and we send inspection photos and documents before loading. This process keeps communication clear and removes the guesswork from sourcing steel products internationally.
Q: What sizes are available for Hot Rolled and Galvanized Steel Flat Bar?
A: We supply thicknesses from 3 mm to 30 mm and widths from 10 mm to 200 mm as standard. Common lengths include 5.8 m, 6 m, 11.8 m, and 12 m. Custom widths up to 300 mm and cut-to-length options are available for larger orders. If your project requires a specific size not listed, our team can arrange production to match your drawings with tight tolerances, ensuring the material fits your fabrication process from the first cut.
Q: What steel grades can I choose from?
A: The most common grades are Q195, Q235, Q345, SS400, A36, S235JR, and S355JR. Q235 and S235JR are excellent general-purpose structural grades. Q345 and S355JR provide higher yield strength for heavier loads. SS400 and A36 are widely recognized for welding and machining. If you need a different chemical composition or mechanical property, we can discuss custom mill orders based on your required standard, and we will provide mill test certificates for every shipment.
Q: How thick is the galvanized coating on the flat bar?
A: The zinc coating typically ranges from 40 to 85 microns, which corresponds to approximately 275 to 600 grams per square meter. The exact coating weight can be specified according to ASTM A123, ISO 1461, or your project standard. Heavier coatings are recommended for coastal, chemical, or continuously wet environments. We can also arrange duplex systems where the galvanized bar is further painted or powder coated for maximum service life.
Q: Can you cut the flat bar to specific lengths before shipping?
A: Yes. Cut-to-length service is available. Provide the required piece lengths, and we will cut the Hot Rolled and Galvanized Steel Flat Bar to your specifications before packing. This reduces on-site cutting labor, minimizes scrap, and allows you to unload and install without waiting for additional processing. We can also deburr and chamfer the cut ends if needed, and we will confirm the exact cut tolerance before production.
Q: Is the flat bar suitable for welding?
A: Yes, the hot rolled base material welds very well. However, because the bar has a zinc coating, you should take standard precautions: weld in a well-ventilated area or use fume extraction, grind off the zinc locally for critical welds if required, and re-apply a zinc-rich paint or cold galvanizing spray to the weld area after welding. These steps help maintain corrosion resistance at the welded joints and keep the finished structure protected.
Q: What is the minimum order quantity?
A: The minimum order quantity depends on the size, grade, and packing method. For standard sizes, we usually require a small trial order of a few metric tons, which can be combined with other steel products from Tianjin YuJie Steel Pipe Trading Co., Ltd. For custom sizes or special grades, the minimum may be higher due to mill scheduling. Contact our sales team with your required specifications, and we will provide a fast quotation with the most flexible terms available for your region.
Q: How do you ensure the flat bar arrives straight and undamaged?
A: We inspect every bundle for straightness, thickness, width, and length before packing. The bars are bundled tightly with steel straps at multiple points to prevent shifting during transport. For long lengths or ocean freight, we add wooden battens, edge protectors, and waterproof wrapping. This packing method has been refined through thousands of shipments, and we work with reliable forwarders to reduce handling damage. If any issue occurs during transit, we have a clear claim process and will work with you to find a fast solution.
Q: Do you provide documents for customs and quality assurance?
A: Yes. Each shipment includes commercial invoice, packing list, bill of lading, mill test certificates, and coating inspection reports when requested. We can also provide a certificate of origin, fumigation certificate for wooden packaging, and other export documents. These documents help you clear customs smoothly and give your quality department the traceability needed to approve the material for use in your project.
