Special Shape Steel Tube - Custom Profiles for Industrial Applications

Kuaima Steel Co., Ltd.

Verified Custom manufacturer 7yrs

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Technical Specifications of Special Shape Steel Tube

Property	Parameter	Description
Product Name	Special Shape Steel Tube	Non-standard cross-section steel tubing for structural and industrial use
Material Grade	Q235B / Q345B / ASTM A500 / S235JRH / S355J2H	Multiple carbon and low-alloy steel grades available
Standard Compliance	ASTM A500, EN 10219, EN 10210, GB/T 6728, JIS G3466	Meets major international hollow section standards
Manufacturing Process	Cold Formed / Hot Formed / Welded (ERW)	Process selected based on shape complexity and wall thickness
Carbon (C)	≤0.26%	Carbon content per ASTM A500 Grade B
Manganese (Mn)	≤1.60%	Enhances strength and hardenability
Phosphorus (P)	≤0.035%	Controlled for improved ductility
Sulfur (S)	≤0.035%	Low sulfur for better weldability
Tensile Strength	≥400 - 580 MPa	Varies by material grade and standard
Yield Strength	≥235 - 355 MPa	Minimum yield strength depending on grade
Elongation	≥20%	Ductility in 50mm gauge length
Available Shapes	Elliptical, D-shape, Hexagonal, Triangular, Trapezoidal, Half-round, Flat-sided Oval	Custom profiles manufactured per drawing
Dimension Range	20mm - 500mm (max cross-section)	Outer dimension varies by profile type
Wall Thickness	0.5mm - 20mm	Standard and custom wall thickness options
Length	5.8m - 12m or custom	Standard and custom cut lengths available
Surface Finish	Black, Galvanized, Painted, Powder Coated, Polished	Multiple surface treatment options for corrosion protection
Application	Architecture, Furniture, Automotive, Machinery, Handrails, Greenhouse	Wide range of structural and decorative applications
Certification	EN 10204 3.1, ISO 9001, SGS, BV	Quality certifications and third-party inspection available
Packaging	Bundled with steel strips, plastic caps, waterproof wrapping	Standard seaworthy export packaging
MOQ	5 tons	Minimum order quantity, smaller qty negotiable for custom shapes

Special Shape Steel Tube - Custom Profiles for Industrial Applications

Special shape steel tube refers to non-standard hollow steel sections manufactured with irregular or customized cross-sectional geometries beyond conventional round, square, and rectangular profiles. These engineered profiles — including elliptical, triangular, hexagonal, D-shaped, flat-sided oval, and other bespoke configurations — serve critical roles in architectural facades, automotive chassis components, machinery frames, and specialized structural assemblies where standard tube profiles cannot meet precise design or functional requirements. With carbon content typically ranging from 0.08% to 0.25% depending on grade selection, these tubes deliver a unique combination of structural efficiency and design flexibility for industrial buyers and project engineers worldwide.

Special shape steel tube supplier

What Is Special Shape Steel Tube?

A special shape steel tube is a hollow steel section produced with a non-standard cross-sectional profile through cold drawing, cold rolling, or custom die forming processes. Unlike conventional round or rectangular tubes manufactured to uniform dimensional series, these profiles are engineered to match specific load-bearing, space-constraint, or aesthetic requirements defined by the end application.

Special Shape Steel Tube Technical Specifications

Custom profile steel tubes are typically manufactured according to EN 10219-1:2006 for cold-formed welded sections or ASTM A500/A500M-21 for carbon steel structural tubing. Common base materials include Q235B, Q345B, S235JRH, S355J2H, and ASTM A500 Grade B/C. Wall thickness ranges from 0.5 mm to 20 mm, with outer dimension tolerances held within ±0.5 mm for precision cold-drawn profiles. Tensile strength varies by grade — for example, ASTM A500 Grade C provides a minimum yield strength of 345 MPa and minimum tensile strength of 427 MPa.

Special shape steel tube wholesale

Parameter	Range / Value
Available Profiles	Elliptical, D-shape, hexagonal, triangular, flat oval, semi-round, custom
Wall Thickness	0.5 mm – 20 mm
Length	1,000 mm – 12,000 mm (custom lengths available)
Surface Finish	Black, galvanized, painted, polished
Material Grades	Q235B, Q345B, S355J2H, ASTM A500 Gr.B/C, SS304/316
Dimensional Tolerance	±0.5 mm (cold-drawn), ±1.0 mm (welded)

Key Advantages of Custom Profile Steel Tubes

Optimized structural efficiency: Tailored cross-sections distribute loads more effectively, reducing overall material weight by up to 15–30% compared to standard sections in equivalent applications.
Design integration: Non-standard geometries allow seamless integration into architectural cladding systems, furniture frames, and vehicle body structures without secondary machining.
Consistent dimensional accuracy: Precision cold-drawing processes ensure repeatable tolerances within ±0.5 mm across full production runs.
Broad material compatibility: Available in carbon steel, stainless steel (304, 316L), and alloy steel to match corrosive, high-temperature, or hygienic environments.

Frequently Asked Questions

What is the minimum order quantity (MOQ) for special shape steel tubes?

MOQ typically starts at 2 metric tons for standard profile shapes. For fully custom die-formed sections, a minimum of 5 metric tons per profile is generally required to offset tooling costs.

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 inspection results traceable to the production heat number.

Special shape steel tube China

What is the typical delivery time?

Standard stocked profiles ship within 7–10 business days. Custom-designed special shape steel tube orders require 25–35 days, including die fabrication, production, and quality inspection.

Can you produce fully custom cross-sectional profiles?

Absolutely. Our engineering team develops custom dies based on client-supplied drawings or CAD files. Prototype samples are available for dimensional and fit verification before full-scale manufacturing begins.

Get a Competitive Quote for Special Shape Steel Tube

Whether your project demands elliptical tubes for architectural features or D-shaped profiles for machinery guards, our mill-direct supply chain delivers factory-competitive pricing with reliable lead times. Contact our technical sales team today with your drawings, required material grade, and target quantities to receive a detailed quotation within 24 hours.

Ratings & Reviews

5.0

Very satisfied

Based on 8 reviews for verified purchases

Supplier service

5.0

On-time shipment

5.0

Supplier service

5.0

Robert Brown

United Kingdom

verified purchases

2025-08-22

Acceptable Quality Custom Tubes — Dimensional Issue Resolved After Communication
Ordered 5.5 tons of custom D-shaped tubes, S235JRH, 2mm wall, for a furniture frame production run. The material quality and certificate documentation were fine. However, upon inspection of the first delivery, we found that approximately 12% of the tubes had a slight bow exceeding our straightness tolerance of 1mm per meter. We raised this with the technical team, who responded within 4 hours and arranged for replacement pieces to be expedited within 9 business days at no additional cost. The replacement batch was within spec. The resolution process was handled professionally, but the initial quality check before dispatch should have caught this. We will consider ordering again given the responsive after-sales handling, but will request pre-shipment inspection documentation for future orders.

Wei Chen

Singapore

verified purchases

2025-09-05

Perfect Custom Profile Tubes — Consistent Quality Across Multiple Orders
We have now completed four separate orders totaling approximately 38 tons of various special shape steel tubes — elliptical, D-shape, and flat oval profiles — across Q235B and S355J2H grades, for redistribution to fabrication clients across Southeast Asia. Quality consistency between orders has been the standout factor: dimensional tolerances, surface finish, and mechanical properties have remained stable across all four production runs. EN 10204 3.1 certificates are issued for every shipment, which satisfies end-client requirements without additional testing. Packaging with steel banding and timber dunnage has protected profiles well during sea freight. Lead times for repeat profile orders have improved to 22–25 days since tooling was already in place. This supplier is now our primary source for non-standard tube profiles.

Michael Johnson

United States

verified purchases

2025-10-01

Reliable Triangular Profile Tubes for Conveyor Frame Application
Purchased 7 tons of triangular steel tubes, Q345B, 3mm wall, 70mm side length, for a custom conveyor frame system at our manufacturing facility in Ohio. Structural performance has been solid — the triangular section gave us the torsional rigidity we needed without adding weight, consistent with the 15–20% material saving we estimated. Mill certificates were complete and traceable. Lead time was 33 days for the custom die profile, which was within the quoted window. One note: the initial quotation response took about 36 hours rather than the 24-hour turnaround stated, though the technical detail in the quote was thorough and worth the wait. We've since placed a follow-up order for an additional 4 tons for Phase 2 of the same project.

William Taylor

Australia

verified purchases

2025-10-23

Premium 316L Stainless Special Shape Tubes for Marine Platform
Sourced 5 metric tons of custom semi-round stainless steel tubes in 316L, 2.5mm wall thickness, for handrail and structural trim components on an offshore marine platform. Corrosion resistance was the primary requirement and the 316L material certificates confirmed carbon content at 0.018% — well within the 0.03% maximum for marine-grade compliance. Dimensional tolerance on the semi-round profile measured consistently at ±0.45mm. Prototype samples were shipped within 10 days of submitting our DXF drawings, allowing our engineers to verify fit before committing to full production. Full batch delivered in 34 days. Compared quotes from four suppliers; this was the most competitive on price while still offering 3.1 certification. Third-party inspection was also accommodated without issue.

Ahmed Al-Hassan

UAE

verified purchases

2025-11-20

Good Value Custom Flat Oval Tubes for HVAC Duct Supports
Ordered 6 tons of flat oval steel tubes, 120×40mm, 1.5mm wall thickness, galvanized finish, ASTM A500 Grade B, for HVAC structural support frames on a large commercial project in Dubai. Material quality and galvanizing coat were consistent throughout. Mill test certificates provided as requested. Delivery came in at 38 days — slightly over the 35-day estimate, though the team communicated the delay proactively and it did not impact our site schedule. Pricing was about 8% lower than our previous supplier for comparable specs. Minor point: packaging could be improved to better protect the galvanized surface during transit — a few tubes had minor scuff marks on arrival. Overall satisfied and would order again.

Carlos Silva

Brazil

verified purchases

2025-12-11

Outstanding Elliptical Tubes for Architectural Facade Project
Placed a 10-ton order for elliptical steel tubes, 100×50mm profile, 2mm wall thickness, Q235B grade with polished surface finish, for a commercial building facade in São Paulo. Surface quality was excellent — no pitting, weld seam grinding was flush, and the polished finish matched our specification sheet exactly. Profiles installed without any rework on site, saving our team approximately 3 days of fitting time. Received EN 10204 3.1 certificates with full chemical and mechanical data. This is our second order with this supplier; first order was 6 tons for a different project. Lead time was 30 days as promised. Pricing was competitive against two other mills we approached.

Hans Mueller

Germany

verified purchases

2026-01-02

Superior Hexagonal Steel Tubes for Automotive Chassis Components
We sourced 12 tons of cold-drawn hexagonal steel tubes, S355J2H grade, 3mm wall thickness, 60mm across flats, for prototype automotive subframe brackets. The cold-drawing process delivered consistent surface finish and dimensional accuracy — measured 15 sample pieces across the production run and all fell within ±0.3mm. Tensile test results confirmed yield strength at 398 MPa, well above the 355 MPa minimum. Engineering team responded to our CAD drawings within one business day and sent prototype samples for fit verification before full production. Certificates fully compliant with EN 10219-1:2006. Shipment arrived 2 days ahead of the 32-day lead time quoted.

James Wilson

United Kingdom

verified purchases

2026-01-17

Excellent D-Shape Tubes for Machinery Guard Frames
Ordered 8 metric tons of D-shaped steel tubes in Q345B, wall thickness 4mm, outer dimension 80×50mm, for industrial machinery guard assemblies. Dimensional tolerance held within ±0.4mm across the entire batch — tighter than the ±0.5mm spec we agreed on. EN 10204 3.1 mill certificates included chemical composition and tensile test results traceable to heat number. No secondary machining required; profiles fitted directly into our welding jigs. Delivered in 28 days including custom die fabrication. Previously sourced similar profiles from a European supplier at nearly 20% higher cost. Will be placing repeat orders for our Q2 production run.