Specializing in the production of various stainless steel pipes, plates, coils, rods, pipe fittings, high nickel alloy steel products, high temperature resistant products
PRODUCTS
Welded Square Tube
Category:
Welded Steel Pipe
keywords :
Welded Steel Pipe
Product Description
Produced by forming steel strip into a tubular shape and longitudinally welding the seam (ERW, HFW, or laser). Features uniform dimensions, clean surface, good formability, and cost-effective production. Available materials: carbon steel (Q195, Q235, Q345, S235JR, S355JR, ST37, ST52). Outer dimensions: 10×10mm to 500×500mm. Wall thickness: 0.5mm – 16.0mm. Length: 3m – 12m or custom. Surface finish: black (as-welded), pickled & oiled, galvanized, or pre-painted. Corner radius: standard (approx. 1.5× wall thickness) or custom sharp/rounded corners. Manufacturing: ERW (electric resistance welding) with post-weld sizing and straightening. Optionally annealed for stress relief. End finish: plain, beveled, or as required. Meets ASTM A500, EN 10219, JIS G3466, or GB/T 6728 standards.
Parameter
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Product name |
Welded square steel pipe |
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Standard |
AISI,ASTM,DIN,JIS,GB ,JIS,SUS,EN,etc |
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Specifications |
Square pipe: 20*20mm-500*500mm |
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Length |
Length: Single random length/Double random length 5m,5.8m,6m,10m,12m,14m or according to the actual requirements of the customer |
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Steel Grade |
SS400, Q235, Q345, Q460, A572 Gr.50, A572 Gr.60, S235, S275, S355, Grade A/B, X42, X52, X60, X70, GB/T 3091, GB/T 13793, ASTM A252, ASTM A53, ASTM A500, EN 10210, EN 10219, API 5L, DIN 1626/1615, DIN 17120, API5L, ASTM A106 Gr.B, ASTM A53 Gr.B, ASTM A270, ASTM A249, ASTM A511, ASTM A778 , ASTM A312, ASTM A358, ASTM A409, ASTM A213, ASTM A790, ASTM A268, ASTM A269, ASTM A554, ASTM B338, ASTM B673, ASTM B674, ASTM B677, ASTM B675, ASTM B676, ASTM B690, ASTM A928, ASME B36.19, ASMEB36.10, ASTMA179/ A192/ A213/ A210/ 370WP91, WP11, WP2 GB5310-2009, GB3087-2008, GB6479-2013, GB9948-2013, GB/T8163-2008, GB8162-2008, GB/T17396-2009 etc. |
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Surface Treatment |
black paint,varnish,oil,galvanized,anti-corrosion coated |
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Processing Service |
Welding, Drilling, Cutting, Bending |
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Application |
Liquid delivery,structure pipe,construction,petroleum cracking,oil pipe,gas pipe |
Application description
Widely used in building frames, scaffolding, handrails, fences, gates, furniture (tables, chairs, shelves), machinery supports, automotive components, trailers, and agricultural equipment. The square shape provides easy joining and high strength-to-weight ratio. Cost-effective for structural and general fabrication projects.
Production description
Carbon steel strip is slit to required width, then fed into a series of forming rolls to be gradually shaped into a round tube. The edges are welded together by high-frequency ERW (electric resistance welding). The welded tube passes through sizing rolls where it is shaped into a square profile. It is then cut to length, straightened, and optionally annealed to relieve stress. The finished tube is inspected for weld integrity, dimensions, and surface quality.
Shipping Packaging
For export, welded square tubes are bundled with plastic end caps, wrapped in VCI paper and moisture-proof polyethylene, packed in wooden crates or on ISPM-15 pallets, secured with steel straps, and fitted with edge protectors. Labels include grade, dimensions, length, quantity, and heat number for safe sea freight.
Why Choose Us?
1.Factory Strength:Direct manufacturer with high-frequency ERW lines, in-line forming and sizing rolls, ensuring consistent outer dimensions, straightness, and weld integrity for square tubes.
2.Quality Assurance:Strict control of dimensional tolerances (outer dimension ±0.5mm, wall thickness ±0.1mm), weld seam strength, and corner radius; 100% eddy current or hydrostatic testing; compliant with ASTM A500, EN 10219, JIS G3466, GB/T 6728.
3.Certifications & Reports:Mill test certificates (MTC) with each shipment; third-party inspections (SGS, BV) and weld ultrasonic test reports available upon request.
4.Customization & Service:Wide carbon steel range (Q195–Q345, S235JR–S355JR, ST37–ST52), sizes 10×10–500×500mm, wall 0.5–16.0mm, custom lengths, surface finishes (black, pickled & oiled, galvanized, pre-painted), and corner radius options with fast lead times.
5.Export Packaging:Plastic end caps + VCI paper + moisture-proof wrapping + wooden crates/ISPM-15 pallets + steel strapping + edge protectors for safe sea freight and damage-free delivery.
FAQ
1. How to prevent rust on welded square tubes?
Store in dry, elevated area, keep original packaging. For black (as-welded) tubes, apply primer if used outdoors. Galvanized or pre-painted options are recommended for humid or corrosive environments.
2. Can welded square tubes be bent or welded further?
Yes. Use mandrel bending for tight radii. Re-welding is fine, but clean the weld area first. Avoid excessive heat near the original weld seam to maintain integrity.
3. What is the difference between ERW welded and seamless square tubes?
ERW welded tubes are cost-effective, with consistent dimensions and good for most structural and general fabrication uses. Seamless tubes have no weld seam, offering higher pressure resistance and uniform grain structure for critical or high-pressure applications.
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FACTORY APPEARANCE
HONORS AND QUALIFICATIONS
The company has sufficient inventory and complete varieties and specifications. Special materials and specifications are produced according to customer requirements and exported to Asia, the Middle East, Europe and other countries and regions. We have our own quality management systems: ISO9001, ISO14000, OHSAS18001 standards.
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We understand that our customers value quality and after-sales service most. We consistently adhere to high standards and strict requirements, striving to become your preferred partner.
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Building 1, Wealth No.1 Plaza, Huaiyin District, Jinan City, Shandong Province, China
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