Precision Welded Carbon Steel Square Tube for Office Furniture and Equipment Frame Supply

• Customization: Available
• Type: Welded
• Technique: Cold Rolled
• Model NO.: Carbon steel pipe
• Material: Carbon Steel
• Surface Treatment: Black
• Usage: Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose
• Section Shape: Square
• Grade: Q235B, Q355b, A500, S235jr
• Section Size: Customized
• Wall Thickness: 1.0mm-20.0mm
• Length: 6m,9m,12m, Customized
• MOQ: 1 T
• Delivery Time: 7-15 Working Days
• Processing Service: Cutting, Punching, Welding, Bending
• Price Terms: Fob , CIF, EXW
• Transport Package: Standard Seaworthy Packing
• Origin: Chongqing China
• HS Code: 7306309000
• Production Capacity: 50000

Product Description

What Are Carbon Steel Pipes?
Carbon steel pipes are high-strength hollow cylindrical tubes engineered primarily from an iron-carbon alloy. They balance excellent tensile strength, hardness, and ductility, making them a foundational piping solution for global industrial infrastructure.

1. Advanced Manufacturing Methods
we supply premium pipes tailored to your pressure and engineering requirements:

Seamless Steel Pipes: Manufactured by heating and piercing solid steel billets. Offering no longitudinal seams, they deliver superior high-pressure resistance for critical environments.
Welded Steel Pipes (ERW / SAW): Produced by cold-forming heavy-duty steel plates or coils into a cylindrical shape and welding the seam. They strictly comply with ASTM and ASME dimensional standards.

2. Key Benefits & Applications
Cost-Effective Strength: Delivers an exceptional combination of high structural durability and a lower procurement cost compared to expensive alloy or stainless steel pipelines.
Versatile Utility: Extensively utilized for fluid transportation (water, oil, natural gas), high-temperature steam lines in power stations, and structural frameworks/scaffolding.
Custom Surface Protection: To counter environmental moisture, we offer multiple specialized anti-corrosion protective measures, including specialized coatings and custom varnishes, to fully ensure material longevity.

Product Description

Specification Item	Product Details & Technical Parameters
Product Name	Carbon Steel Pipe, Seamless / Welded Steel Tube, Line Pipe
Standard Compliance	ASTM A106, ASTM A53, ASTM A179, ASTM A192, ASME SA210, EN 10216, DIN 1629, JIS G3454, GB/T 8162, GB/T 8163
Material Grades (Categorized by Standard)	American Standard (ASTM): Gr.B, X42, X46, X52, X60, X65, X70, A106B, A53B, A178C European/German Standard: ST37, ST37-2, ST35, ST45, ST35.8, 19Mn5 Chinese Standard (GB): 10#, 20#, 45#, Q195, Q215, Q235, Q345 (A/B/C/D/E) Alloy Steel Options: P1, P2, P5, P9, P11, P12, P22, P91, T1, T2, T11, T22, 15CrMo, 12Cr1MoV
Outer Diameter (OD)	21.3 mm - 1420 mm (1/2" - 56")
Wall Thickness (WT)	2.11 mm - 60.00 mm (SCH 10 - SCH 160, XXS)
Third-Party Inspection	ISO, BV, SGS, TUV, MTC (Mill Test Certificate) complies with EN 10204 3.1
Surface Treatment	Bare, Black Painting / Varnished, Anti-Corrosion Oiled, 3PE Coating, Galvanized
End Finish Options	Plain Ends, Beveled Ends (with plastic caps), Threaded & Coupled
Delivery Lead Time	Approximately 7 - 10 working days upon receipt of deposit
Standard Packaging	Hexagonal bundles secured with steel strips, water-proof plastic wrapping, or custom seaworthy wooden boxes for high-precision tubes.

Square (SHS)Size (mm)	Wall Thickness(WT) (mm)	Rectangular (RHS)Size (mm)	Wall Thickness(WT) (mm)	Round (CHS)OD (Inch/mm)	Wall Thickness(WT) (mm)
20 x 20	1.0 - 2.5	20 x 10	1.0 - 2.5	21.3 mm (1/2")	1.0 - 2.5
25 x 25	1.0 - 3.0	30 x 15	1.0 - 3.0	26.7 mm (3/4")	1.0 - 3.0
30 x 30	1.0 - 3.5	40 x 20	1.0 - 3.5	33.4 mm (1")	1.0 - 3.5
40 x 40	1.0 - 4.0	50 x 25	1.0 - 4.0	42.2 mm (1-1/4")	1.0 - 4.0
50 x 50	1.0 - 5.0	60 x 30	1.0 - 5.0	48.3 mm (1-1/5")	1.0 - 5.0
60 x 60	1.0 - 6.0	80 x 40	1.0 - 6.0	60.3 mm (2")	1.0 - 6.0
80 x 80	1.0 - 10.0	100 x 50	1.0 - 10.0	88.9 mm (3")	1.0 - 10.0
100 x 100	1.0 - 10.0	120 x 60	1.0 - 10.0	114.3 mm (4")	1.0 - 10.0
120 x 120	1.0 - 10.0	150 x 100	1.0 - 10.0	141.3 mm (5")	1.0 - 10.0
150 x 150	1.0 - 10.0	200 x 100	1.0 - 10.0	168.3 mm (6")	1.0 - 10.0

Round Pipes

Primary Application: Fluid, Gas, and High-Pressure Transportation.

Core Advantage: The circular cross-section inherently provides maximum structural integrity and distributes internal pressure evenly, making it the premier choice for critical pressure-bearing systems.

Key Use Cases:

High-pressure oil and gas transmission pipelines.
Thermal steam lines in power plants and industrial processing facilities.
High-pressure water mains and commercial fire protection sprinkler systems.

Square Pipes

Primary Application: Structural Engineering and Symmetrical Frameworks.

Core Advantage: Features flat-face integration for seamless welding and jointing, offering excellent uniform load resistance and high torsional strength.

Key Use Cases:

Structural columns, posts, and pillars where mechanical loads are applied symmetrically.
Light to medium-weight support systems, including storage racks, machinery frames, and conveyor supports.
Architectural handrails, security fences, gates, and tractor framework fabrications.

Rectangular Pipes

Primary Application: Structural Framing and Flat-Surface Integration.

Core Advantage: The flat side surfaces make rectangular pipes ideal for seamless integration with other flat materials (such as steel sheets, plates, and panels), providing high bending strength and stable mounting foundations.

Key Use Cases:

Heavy-duty building frames, wall structures, and modern roofing infrastructure.
Heavy equipment chassis and fabrication frames (including trucks, agricultural machinery, and material handling systems).
Industrial manufacturing racks, commercial engineering enclosures, and custom steel fabrication projects.

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FAQ

Q: How can I get a precise quotation?
A: Please provide your detailed requirements, including steel grade, pipe dimensions (outer diameter, wall thickness, length), and order quantity. Our team will send you the best competitive quote immediately.

Q: What are your core advantages as a steel supplier?
A: We offer OEM customized processing with a large running inventory to guarantee flexible MOQs. With strong raw material channels, 24-hour fast response, and full Mill Test Certification (MTC), we ensure maximum cost-efficiency and quality.

Q: What is your standard delivery lead time?
A: For running stock items, delivery is within 7 to 15 days. For customized fabrication or special production runs, the standard lead time is approximately 25 days.

Q: How do you guarantee the quality and safety of my cargo?
A: We welcome factory audits to inspect our production and testing lines. We can provide free samples for evaluation and fully support international third-party inspections (such as SGS or BV) before shipment.

Q: How are the carbon steel pipes packaged for shipment?
A: Pipes are packaged in secure hexagonal bundles with rust-resistant oiling, anti-crush plastic end caps, and heavy-duty metal strapping. For bulk or container shipping, they are reinforced with professional wood blocks and steel lashing to prevent movement during transit.