Special Section Steel Pipe - High-Strength Custom Profiles for Industrial Applications

Kuaima Steel Co., Ltd.

Verified Custom manufacturer · 7 yrs ·

China

Customizable Rock-bottom price

$720 1-49 ton Base price

$685 50-99 ton 4.9% off

$670 ≥100 ton 6.9% off

Price validity: subject to market conditions

Supplier's customization ability

Drawing-based customization
Sample-based customization
Full customization

Quantity

Minimum order quantity: 1 ton

Shipping total: To be negotiated

Subtotal of goods US$ 720.00

Start order request

Payment and delivery

Payment:: by contract — deposit, balance after your inspection
Lead time:: confirmed with the quotation
Packaging:: standard export packing
Samples:: available on request

Product details

Technical Specifications of Special Section Steel Pipe

Property	Parameter	Description
Product Name	Special Section Steel Pipe	Non-circular hollow section steel tubing with custom profiles
Material Grade	Q235B / Q345B / S235JR / S355JR / ASTM A500	Multiple carbon steel grade options available
Standard Compliance	ASTM A500, EN 10219, EN 10210, GB/T 6728	Meets major international structural steel standards
Manufacturing Process	Cold-formed / Hot-formed / Welded	ERW or seamless production methods
Carbon (C)	≤0.22%	Carbon content per Q345B / S355JR specification
Manganese (Mn)	≤1.60%	Enhances strength and hardenability
Silicon (Si)	≤0.55%	Deoxidizer for improved steel quality
Phosphorus (P)	≤0.035%	Controlled for ductility and toughness
Sulfur (S)	≤0.035%	Low sulfur for improved weldability
Tensile Strength	≥470 MPa	Minimum tensile strength per Q345B / S355JR
Yield Strength	≥345 MPa	Minimum yield strength at room temperature
Elongation	≥21%	Ductility in 50mm gauge length
Profile Shapes	Elliptical, D-shape, Triangular, Hexagonal, Flat-sided Oval, Semi-circular	Custom special cross-section profiles available
Dimension Range	20mm - 500mm (major axis)	Outer dimension across the largest profile axis
Wall Thickness	1.0mm - 25mm	Standard and custom wall thickness options
Length	5.8m - 12m or custom	Standard and cut-to-length available
Surface Finish	Black, Galvanized, Painted, Oiled	Multiple surface treatment options for corrosion protection
Application	Architecture, Furniture, Machinery, Automotive, Guardrails	Structural and decorative applications across industries
Certification	EN 10204 3.1, ISO 9001, CE Marking	Quality certifications provided with shipment
MOQ	5 tons	Minimum order quantity for standard profiles

Special Section Steel Pipe - High-Strength Custom Profiles for Industrial Applications

Special section steel pipe refers to hollow structural tubing manufactured in non-standard geometric profiles—including triangular, hexagonal, elliptical, D-shaped, and other irregular cross-sections—engineered to meet precise structural and functional demands. Unlike conventional round or square tubing, these custom-profiled pipes deliver optimized load distribution, space-efficient design, and enhanced aesthetic versatility. They serve critical roles in architectural frameworks, machinery manufacturing, automotive components, and agricultural equipment where standard shapes simply cannot fulfill project requirements.

What Is Special Section Steel Pipe?

A special section steel pipe is any steel tube produced with a non-circular, non-rectangular cross-sectional geometry. These profiles are typically cold-formed or hot-rolled from carbon steel (Q235B, Q345B) or alloy steel feedstock, shaped through custom dies or roll-forming processes to achieve precise dimensional tolerances. Common configurations include oval, semi-circular, trapezoidal, flat-sided oval, bread-shaped, and multi-sided polygonal sections conforming to manufacturer specifications or buyer-supplied drawings.

Special Section Steel Pipe Technical Specifications

Our special section steel pipe products are manufactured according to GB/T 6728, ASTM A500, and EN 10219-1:2006 standards. Key parameters include:

Property	Range / Value
Wall Thickness	1.0 mm – 25.0 mm
Outer Dimension	20 mm – 600 mm (profile-dependent)
Length	6 m, 12 m, or cut-to-length
Steel Grade	Q235B, Q345B, S235JRH, S355J2H, ASTM A500 Grade B/C
Yield Strength (Q345B)	345 MPa minimum
Tensile Strength (Q345B)	470–630 MPa
Surface Treatment	Black, galvanized, painted, or oiled

Key Applications of Custom Profile Steel Tubing

Special section steel pipe finds extensive application across diverse industries owing to its geometry-driven performance advantages:

Special section steel pipe supplier

Architectural & Curtain Wall Systems: Elliptical and D-shaped profiles provide streamlined visual appeal for building facades, handrails, and decorative structural elements.
Agricultural Machinery: Flat-oval and triangular tubes serve as implement arms, frame members, and PTO shafts requiring directional rigidity.
Automotive & Transportation: Lightweight irregular sections reduce vehicle mass while maintaining superior structural integrity in chassis and roll-cage components.
Industrial Equipment: Hexagonal and trapezoidal profiles are commonly employed for conveyor frames, guide rails, and specialized mechanical assemblies.

Why Choose Our Special Section Steel Pipe

With over 15 years of experience in custom steel tube production, we operate dedicated roll-forming and cold-drawing lines capable of producing profiles from client-supplied CAD drawings. Every batch undergoes ultrasonic testing per GB/T 4163 and dimensional inspection to ensure wall thickness tolerance within ±0.15 mm. Our facility holds ISO 9001:2015 certification and maintains full material traceability from billet to finished product.

Special section steel pipe wholesale

Frequently Asked Questions

What is the minimum order quantity (MOQ) for special section steel pipe?

Standard profiles carry a MOQ of 5 metric tons. For fully custom cross-sections requiring new tooling, the minimum starts at 10 metric tons to offset die fabrication costs.

Special section steel pipe China

Do you provide material test certificates?

Yes. Every shipment includes EN 10204 Type 3.1 mill test certificates documenting chemical composition, mechanical properties, and dimensional verification results.

What is the typical delivery time?

Stock profiles ship within 7–10 business days. Custom-designed special section steel pipe orders generally require 25–35 days, including die preparation and production.

Can you produce profiles from our own drawings?

Absolutely. We accept DWG, DXF, and STEP files. Our engineering team reviews each drawing for manufacturability and provides a detailed quotation within 48 hours.

Get a Competitive Quote for Special Section Steel Pipe

Whether you need elliptical tubing for architectural projects or custom polygonal profiles for heavy machinery, our factory-direct pricing and flexible production capabilities ensure you receive precisely the product your application demands. Contact our sales team today with your specifications, quantities, and target delivery schedule to receive a detailed, obligation-free quotation.

Ratings & Reviews

4.5

Based on 8 reviews

5 5

4 2

3 1

2 0

1 0

Chris Martin

Canada

2025-02-21

Acceptable Quality Oval Tubes, Communication Delay at Start

Ordered 11 tons of oval special section steel pipe (ASTM A500 Grade B, 76×38mm, 3.2mm wall) for a recreational equipment manufacturer in Ontario. The final product quality was acceptable—dimensions were within tolerance and the material certificates confirmed compliance with A500 Grade B yield strength requirements. However, initial communication during the quoting phase was slow, with a 72-hour response to our technical questions versus the 48-hour commitment stated on their page. Once production started, updates were regular and delivery arrived on day 31 within the promised window. We also had to follow up twice to receive the full dimensional inspection report. Issues were resolved and the material performed well in our client's application, so we may order again but expect tighter communication next time.

Wei Chen

Singapore

2025-03-16

Excellent Polygonal Section Pipe for Machinery Assembly Projects

As a trading company supplying steel components to Southeast Asian manufacturers, we have now placed four orders totaling over 60 tons of various special section steel pipe profiles through this factory. Most recent order was 16 tons of octagonal section pipe (Q345B, 60mm across-flats, 3.0mm wall) for an industrial machinery client in Vietnam. EN 10204 3.1 certificates, packing lists, and dimensional inspection reports were all ready when we requested them for customs clearance—no delays on documentation. The factory's ability to produce multiple profile types under one order simplifies our logistics significantly. Stock profiles shipped in 9 business days. We continue to recommend this supplier to our manufacturing clients across the region.

Carlos Silva

Brazil

2025-04-09

Reliable Semi-Circular Profiles for Automotive Chassis Components

We purchased 14 tons of semi-circular special section steel pipe (Q345B, 70mm radius, 3.5mm wall, 12m lengths) for automotive chassis subframe production. Mechanical properties on the mill certificates were consistent across three production heats included in the shipment. Wall thickness uniformity was good—our QC team measured variation of no more than 0.13mm across the profile. Pricing was 11% below our previous Chinese supplier for equivalent specifications. Lead time ran 37 days versus the 35-day estimate, a minor delay attributed to port congestion that was communicated proactively. The painted surface treatment required one additional coat on our end due to humidity exposure during shipping, which we have since addressed by specifying oiled finish for future orders.