Product Specification

Parameter	Details
Shape	Square
Surface Treatment	Shot Blasting, Bared, Black Painted, Galvanized, Oiled or to your requirements
Out diameter	10mm-600mm, other sizes negotiable
Wall Thickness	1.2mm-30mm, other sizes negotiable
Length	Up to 16m
Tolerance of OD	±0.15mm
Steel material	20#, Q355, Q390, Q420, Q460, Q500, Q620, Q690, 35#, 45#, 40Cr, 12CrMo, 30CrMO, 35CrMo, 42CrMo, S235JRH, S275J0H, S275J2H, S355J0H, S355J2H, S355K2H, S275NH, S275NLH, S355NH, S355NLH, S420NH, S420NLH, S460NH, S460NH, S460NLH, BJ780, BJ890, YG550, YGS70, YGS100, YGS100BJ, YGS130, YGS150, YG960, etc.
Technical Standard	GB/T 3094-2012, EN 10210, ASTM A106
Technique	Cold draw
Supply Ability	5000 tons
Payments Term	T/T or L/C
MOQ	1 ton
Delivery condition	Annealed, Normalized, Tempered and quenched (Q&T)

Product Description

Seamless square pipe is a type of steel tube with a square cross-section and no welding seam. It is formed from seamless round pipes through cold drawing. Compared to welded square pipes, seamless ones offer superior strength, pressure resistance, and uniform stress distribution, making them ideal for structural and precision applications.

Our seamless square pipes are available in a wide range of sizes, with precise dimensions and multiple surface treatment options such as painting, shot blasting, and oiling. We also offer custom lengths and processing services to meet specific project requirements.

Application

Construction & Architecture	Steel frame structures, curtain wall supports, handrails, trusses
Machinery & Equipment	Machine bases, lift systems, structural brackets
Automotive & Transportation	Chassis frames, trailer skeletons, rail transit components
Furniture & Metal Products	Office furniture frames, cabinets, display racks
Energy & Petrochemical	Vessel supports, pipeline frames, high-pressure structures

Available Mold

Quality Control

Steel Material Inspection
- We source high-quality tube blanks from trusted suppliers.
- Each batch is tested for composition, strength, and defects.
Strict Production Control
- Follow detailed manufacturing standards at every step.
- Regular checks + random inspections to ensure consistency.
Final Product Testing
- Measure dimensions, pressure resistance, and surface quality.
- Only approved pipes are delivered.

Customization

With in-house tooling, material sourcing, and technical support, we offer flexible customization to meet your specific needs:

Dimension Customization: Non-standard diameter, thickness, and length
Material Options: Carbon steel, stainless steel
Processing Services: Cutting, logo marking
Surface Treatment: Painting, shot blasting, oiling, galvanizing
Marking & Packaging: Custom logo, labels, and packaging options

We support drawing-based production, small batch trial orders, and fast sample delivery to help your projects start quickly.

Packaging & Delivery

We provide professional packaging and flexible delivery options based on your product and shipping needs:

Packaging Methods:
- Steel-strapped bundles with labels
- Plastic wrap + woven fabric cover
- Export-grade wooden cases or pallets
- Plastic end caps for tube protection
Delivery Options:
- Sea freight, truck transport, or rail shipment
Common ports:
- Shanghai, Changsha
Lead Time:
- Standard sizes: 7–15 days
- Custom orders: 30–45 days

Export documents such as CO, CQ, and third-party inspection reports are available upon request.

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FAQ Section

Q1: How could you guarantee your products?

A1: Each piece of products is manufactured by certified workshops, inspected by piece according to national QA/QC standard. We also could issue the warranty to customer to guarantee the quality.

Q2: Can we visit your factory?

A2: Warmly welcome. Once we have your schedule, we will arrange the professional sales team to follow up your case.

Q3: Are you a factory or trading company?

A3: We are manufacturers and also do export trade.

Q4: Can I get some samples?

A4: Yes, We are pleased to provide you with samples of our products.

Q5: How about MOQ?

A5: We have stock for common sizes at hand, so one ton per size is acceptable.