Black Rectangular Steel Tube

Black Rectangular Steel Tube: The Robust Backbone for Modern Fabrication

For industrial builders, architectural fabricators, and DIY enthusiasts seeking a combination of exceptional strength, clean aesthetics, and versatile form, the black rectangular steel tube is an indispensable material. Unlike standard hot-rolled sections, our black rectangular steel tubes offer a superior finish and dimensional consistency, making them ideal for projects where both structural integrity and visual appeal are paramount. This product is part of our comprehensive range of structural hollow sections, which includes options like the Striped Rectangular Hollow Section for specialized grip applications, the uniformly coated Black Finished Rectangular Tube, and the robust Black Rectangular Pipe. For those requiring a textured surface for enhanced adhesion or a unique look, our Striped Rectangular Steel Pipe provides an excellent alternative. The defining characteristic of the black rectangular steel tube is its mill finish—a dark, scale-rich surface formed during the manufacturing process that provides a natural protective layer against corrosion in certain environments and offers an industrial, ready-to-use appearance perfect for modern designs.

Detailed Specifications and Technical Data

To ensure your project specifications are met with precision, our Black Rectangular Steel Tube is manufactured to exacting standards. The product is typically made from structural steel grades such as ASTM A500 Grade B or C, ensuring high yield and tensile strength. The tubes are formed through a continuous weld process, creating a consistent and reliable seam. Below are the key parameters available in our standard inventory. Custom sizes and chemistries can be accommodated for large-scale orders.

Commonly Available Sizes (Outer Dimensions & Wall Thickness):

1" x 2" (25mm x 50mm) - Wall: 16ga (1.5mm), 14ga (2.0mm), 1/8" (3.2mm)
2" x 2" (50mm x 50mm) - Wall: 14ga (2.0mm), 1/8" (3.2mm), 3/16" (4.8mm)
2" x 3" (50mm x 75mm) - Wall: 14ga (2.0mm), 1/8" (3.2mm), 3/16" (4.8mm)
2" x 4" (50mm x 100mm) - Wall: 1/8" (3.2mm), 3/16" (4.8mm), 1/4" (6.4mm)
3" x 4" (75mm x 100mm) - Wall: 1/8" (3.2mm), 3/16" (4.8mm), 1/4" (6.4mm)

Material and Mechanical Properties Table:

Property	Specification (ASTM A500 Grade B)	Specification (ASTM A500 Grade C)
Yield Strength (min)	46,000 psi (317 MPa)	50,000 psi (345 MPa)
Tensile Strength (min)	58,000 psi (400 MPa)	62,000 psi (427 MPa)
Elongation (in 2")	23% min	21% min
Carbon Content (max)	0.26%	0.23%

Standard Lengths and Tolerances:

The Black Rectangular Steel Tube is supplied in random mill lengths, typically ranging from 18 to 24 feet (5.5 to 7.3 meters). Custom cut lengths are available. Standard tolerances comply with ASTM A500 for outside dimensions, wall thickness, and straightness.

Outside Dimensions Tolerance: ±0.020 inches for sizes under 3 inches, ±0.5% for sizes 3 inches and over.
Wall Thickness Tolerance: ±10% of the nominal wall.
Straightness: Maximum deviation of 1/8 inch per 10 feet of length.

The inherent strength-to-weight ratio of the Black Rectangular Steel Tube makes it a top choice for frameworks, supports, gates, fencing, handrails, and machinery bases. Its flat surfaces simplify fabrication, welding, and joining compared to round tubing. When specifying, consider the environment; while the mill scale offers some protection, for exterior applications or corrosive atmospheres, priming and painting or powder coating are recommended for long-term durability.

Hot Products

Thick Wall Straight Seam Welded Pipe
Xinlida manufacturer’s China Thick Wall Straight Seam Welded Pipe is a pipe which is welded along a straight line after bending steel plate or steel strip into a circular or square section.Its wall thickness is usually large and can withstand high internal or external pressures.The welding seam of this kind of pipe is linear, the welding process is relatively simple, and the production efficiency is high.
Galvanized round pipe
Tianjin Xinlida Steel Pipe Co., Ltd. is deeply rooted in the steel pipe manufacturing industry, having established a comprehensive business matrix comprising domestic production, overseas bases, and global trade. Specializing in hot-dip galvanized round pipes that meet national standards, the company supplies procurement clients for construction, energy, and transportation projects both at home and abroad, serving as a reliable pipe supplier for projects across Southeast Asia and the Middle East. The company holds full import-export qualifications and operates an intelligent production facility with an annual capacity of 50 million tons, fully equipped with automated, smart manufacturing systems. Its products are crafted in strict accordance with national standards, with core strengths centered on four key areas: long-lasting anti-corrosion and rust resistance, a comprehensive range of specifications, suitability for all outdoor construction scenarios, and support for standardized containerized export. These capabilities precisely address four major procurement pain points associated with overseas infrastructure and outdoor pipeline projects: susceptibility to rust, difficulty in matching specifications, high shipping and containerization costs, and slow response times for non-standard orders.These hot-dip galvanized round pipes feature a uniform, dense coating that withstands rain and saline-alkali corrosion during outdoor use, eliminating the need for frequent replacements and reducing long-term maintenance costs. A comprehensive range of sizes—from small-bore 1/2-inch (4-fen) to large-bore 10-inch pipes—is available in stock, with options for custom dimensions; early consultation allows for flexible adjustments to specifications and order quantities, while rapid production scheduling helps buyers avoid inventory backlogs and project delays. Leveraging proprietary cross-border trade channels, the pipes can be nested and packed efficiently to minimize container space and directly cut overseas shipping costs. Balancing quality, cost, and delivery requirements, the product is ideally suited for long-term bulk procurement by foreign trade contractors and domestic outdoor infrastructure firms.
Large Diameter Galvanized Elliptical Pipe
In many fields such as construction, machinery, agriculture, forestry, animal husbandry and fishery, the demand for Large Diameter Galvanized Elliptical Pipe is increasing day by day.Tianjin Xinlida Steel Pipe Co., Ltd. has been focusing on this since its establishment in 2015 and stands out in the market with professional strength.
Black spiral welded steel pipe
Tianjin Xinlida Steel Pipe Co., Ltd. has deep expertise in steel pipe manufacturing and global trade, establishing an integrated service system encompassing domestic production, overseas bases, and global trade. Its products are exported to Southeast Asia, the Middle East, and other overseas regions. The company possesses formal import and export qualifications and a large-scale production capacity of 50 million tons per year. Its flagship product is Black spiral welded steel pipe, utilizing intelligent production equipment and mature manufacturing processes to create high-performance, cost-effective bare pipe products. This product is also the preferred choice for cost control in engineering projects and customized secondary processing. This product eliminates the need for surface anti-corrosion processes such as galvanizing and painting, significantly reducing procurement costs while ensuring the high strength, deformation resistance, and wide range of large diameter options of the spiral pipe. It is suitable for various indoor, overhead, temporary, and pile foundation construction scenarios, and also supports customers in performing subsequent anti-corrosion treatment. The company can quickly respond to specifications and quantity adjustments, combining efficient production with strict quality inspection to address the pain points of high procurement costs, customization difficulties, and unstable supply in overseas engineering and infrastructure projects from three aspects: sourcing, quality, and service. This provides reliable pipe solutions for global buyers.
National Standard Hot-Dip Galvanized Square and Rectangular Tubes
Xinlida Steel Pipe's national standard hot-dip galvanized square and rectangular tubes are hollow steel components made from high-quality steel strips or plates through cold bending, precision welding, or hot rolling processes. Their cross-section is a standard rectangle with all internal angles at a standard 90°. They are mainly used in load-bearing, support, and frame structures. National standard hot-dip galvanized square and rectangular tubes reduce weight by 30%-50%, increasing mileage by 12% in vehicle applications. This lightweight advantage significantly reduces transportation and installation costs. The flat contact surface design provides more connection methods, improving installation efficiency by 40% compared to round steel tubes, with node connection accuracy reaching ±0.1 mm.
Cold-rolled seamless steel pipes for construction machinery
In the field of construction machinery, steel pipes, as a key basic material, directly affect the stability and safety of projects due to their performance and quality. Tianjin Xinlida Steel Pipe Co., Ltd. has deep expertise in its core steel pipe business and has made significant achievements in the research and development and production of steel pipes for construction machinery. Its Cold-rolled seamless steel pipes for construction machinery , with their excellent properties, have become the ideal choice for numerous engineering projects.

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