China Round Steel Pipe Manufacturers Suppliers Factory - Round Steel Pipe for Sale

Round Steel Pipe Manufacturer & Supplier

CXC Steel Tubes is a global manufacturer and supplier of round steel pipes, providing customized solutions for construction, industrial, agricultural, automotive, and renewable energy applications worldwide.

Carbon Steel Round Tube
Carbon Steel Round Tube delivers reliable strength, consistent dimensions, and excellent weldability for structural, mechanical, and industrial applications, reducing fabrication time and
Black Round Steel Tube
The Black Round Steel Tube is a carbon steel round tube manufactured using seamless or welded processes, featuring high strength, good weldability, and stable dimensional accuracy.
Galvanized Round Steel Pipe
Galvanized Round Steel Pipe is made of high-quality carbon steel, which is ERW high-frequency welded and then hot-dip galvanized (HDG) or pre-galvanized, providing excellent corrosion resistance
Bright Round Steel Tube
Bright Round Steel Tubes are manufactured using cold drawing or cold rolling processes and undergo protective atmosphere bright annealing. They possess high dimensional accuracy, a smooth surface,
ZAM Coated Round Steel Pipe
ZAM Coated Round Steel Pipe is manufactured from Zinc-Aluminum-Magnesium coated steel strip through ERW welding process. The Zn-Al-Mg alloy coating forms a stable protective layer, providing

Types of Round Steel Pipe

Carbon Steel Round Tube

The most commonly used round steel pipe solution, manufactured from carbon steel, making it ideal for construction structures, machinery frames, equipment supports, and general industrial fabrication projects.

Black Round Steel Tube

A cost-effective carbon steel tube featuring a natural black oxide surface finish, widely used for indoor steel structures, furniture frames, metal fabrication, and applications where additional corrosion protection is not required.

Galvanized Round Steel Pipe

A corrosion-resistant steel pipe with a zinc coating that provides enhanced protection against rust and weather exposure, making it suitable for outdoor structures, greenhouses, fencing systems, agricultural facilities, and construction projects.

Bright Round Steel Tube

A precision steel tube with a smooth bright surface finish, suitable for furniture, automotive parts, decorative structures, and mechanical components.

ZAM Coated Round Steel Pipe

An advanced corrosion-resistant steel pipe coated with a zinc-aluminum-magnesium alloy, suitable for demanding outdoor applications including solar mounting systems, infrastructure projects, and harsh environmental conditions.

Product Specifications

Product Type	Outer Diameter (OD)	Wall Thickness (WT)	Standard Lengths	Material Grade	Surface Treatment
Carbon Steel Round Tube	20 mm – 219 mm	0.75 mm – 12 mm	3 m – 12 m	Carbon Steel	Mill Finish / Plain
Black Round Steel Tube	10 mm – 219 mm	0.75 mm – 12 mm	3 m, 6 m, 9 m	Carbon Steel	Black Oxide / Natural
Galvanized Round Steel Pipe	10 mm – 219 mm	0.75 mm – 6 mm	Standard 6 m	High-Quality Carbon Steel	Hot-Dip / Pre-Galvanized
Bright Round Steel Tube	10 mm – 219 mm	0.75 mm – 12 mm	3 m – 12 m (Custom Available)	Carbon Steel	Bright Annealed / Pickled
ZAM Coated Round Steel Pipe	10 mm – 219 mm	0.75 mm – 6.0 mm	Standard 6 m	Carbon Steel with ZAM Coating	Zinc-Aluminum-Magnesium Alloy

Manufacturing Process

01/

Raw Material Sourcing: Selection of high-grade carbon steel coils with certified chemical composition and mechanical properties.

02/

Slitting & Uncoiling: Steel coils are slit to precise widths corresponding to the targeted pipe circumference.

03/

Forming: The slit steel strip passes through a series of precision breakdown and fin rollers to gradually shape the flat strip into a seamless cylindrical tube.

04/

Welding: High-Frequency Induction Welding (HFIW) or Electric Resistance Welding (ERW) fuses the edges of the tube together under intense pressure, creating a strong, homogeneous longitudinal weld seam.

05/

Sizing & Straightening: The welded pipe passes through sizing mills to achieve exact outer diameter tolerances and is straightened to ensure linear accuracy.

06/

Cutting & Non-Destructive Testing: Tubes are cut to standard or customized lengths, followed by rigorous weld-seam inspections and hydrostatic testing.

Surface Treatments and Coating Options

Mill Finish / Black Surface: Retains the natural oxide skin from the thermal manufacturing process; ideal for interior structural frameworks that will be painted or enclosed.

Hot-Dip Galvanizing: Immerses the steel pipe in molten zinc to form a metallurgical bond, providing thick, sacrificial protection against rust in outdoor settings.

Pre-Galvanized Coating: Utilizes pre-coated galvanized steel strips for smooth, uniform zinc coverage on lighter wall thicknesses.

Bright Annealing / Pickling: Chemical or thermal cleaning processes that remove scale and impurities, yielding a smooth, bright surface ready for plating, painting, or precision engineering.

ZAM Coating (Zinc-Aluminum-Magnesium): Advanced multi-element alloy coating that self-heals along cut edges, offering up to several times the corrosion resistance of traditional galvanizing.

Applications of Round Steel Pipe

Construction & Architecture: Structural steel buildings, support columns, scaffolding, handrails, architectural accents, and temporary construction framing.

Agriculture & Horticulture: Greenhouse support structures, livestock enclosures, farm fencing, and irrigation pipeline systems.

Machinery & Heavy Equipment: Equipment chassis, heavy-duty machine frames, structural supports, and protective safety guards.

Automotive & Transportation: Vehicle chassis frames, exhaust components, trailer structures, and specialized tubular brackets.

Solar & Renewable Energy: Ground-mounted solar panel racking systems, tracker tubes, and outdoor renewable energy infrastructure.

How to Choose the Right Round Steel Pipe

Selecting the optimal round steel pipe requires evaluating key operational parameters:

Determine Environmental Conditions

Choose standard black or carbon steel for indoor, climate-controlled environments; select galvanized or ZAM-coated pipes for outdoor, humid, or corrosive atmospheres.

Calculate Load Requirements

Assess the expected structural weight, pressure ratings, and mechanical stress to select appropriate outer diameters and wall thicknesses.

Evaluate Fabrication Needs

Consider whether the project requires extensive welding, bending, or precision machining (e.g., opting for bright tubes for visible finishes).

Verify Standards

Ensure the chosen steel grade aligns with regional and international engineering specifications (e.g., ASTM, EN, JIS, GB).

Customization Options

Custom Dimensions

Tailored outer diameters and precise wall thicknesses engineered to exact project blueprints.

Specialized End Finishes

Plain ends, beveled ends for optimal welding, threaded ends, or grooved ends.

Custom Cutting & Lengths

Precision cutting to specific fixed lengths (ranging from micro-components to full 12-meter industrial lengths) with tight length tolerances.

Custom Packaging

Bundling, waterproof wrapping, steel strapping, and custom stencil labeling designed for safe international ocean and land freight.

Quality Control

Raw Material Testing: Spectrometric chemical analysis and mechanical tensile testing of incoming steel coils.

In-Process Monitoring: Continuous automated dimensional gauging and non-destructive eddy current or ultrasonic testing of weld seams.

Finished Product Inspection: Visual surface checks, wall thickness verification, length measurement, and flattening/bending tests.

Mill Test Certificates (MTC): Comprehensive EN 10204 3.1 certification provided with shipments to guarantee complete material traceability.

Packaging and Delivery

To protect our round steel pipes from transit damage, moisture, and corrosion during long-distance maritime shipping, we implement rigorous export packaging protocols:

Secure Bundling

Tubes are tightly bundled using heavy-duty steel strips into hexagonal or square bundles.

Moisture Protection

Plastic woven wrapping or waterproof film applied to protect against marine humidity and rain.

End Protection

Plastic caps fitted on pipe ends to prevent thread damage and deformation.

Container Optimization

Efficient loading into 20ft/40ft standard containers or open-top containers by experienced warehouse personnel to maximize space safety and minimize freight costs.

productcate-1-1

Frequently Asked Questions

Q: What is the standard minimum order quantity (MOQ) for custom-sized round steel pipes?

A: Our standard MOQ varies by specification, but we offer flexible batch production to accommodate both pilot orders and full-scale industrial procurement.

Q: What international quality standards and material grades do your round steel pipes comply with?

A: Our products are manufactured to conform with major global benchmarks including ASTM, EN, JIS, and GB standards with verified material compositions.

Q: Do you offer third-party inspection services before container loading?

A: Yes, we fully cooperate with recognized international inspection agencies like SGS, BV, and Intertek designated by buyers.

Q: What are the available payment terms for new global wholesale clients?

A: We accept standard secure commercial payment terms including T/T wire transfer and L/C at sight for qualifying volume orders.

Q: Can you apply custom stencil marking or branding on the steel pipe surface?

A: Yes, we provide custom ink-jet stenciling with client logos, grade names, batch numbers, and standards per contract requirements.

Q: How do you prevent internal and external corrosion during long ocean transits?

A: We apply protective oil films, plastic end caps, and heavy-duty waterproof woven wrapping to safeguard pipes against saline marine moisture.

Q: What is the typical lead time for bulk production and port delivery?

A: Standard production cycles range from 15 to 25 days depending on order volume, customization requirements, and current mill scheduling.

Q: Are your welding seams rigorously tested for structural integrity?

A: Yes, all high-frequency welded pipes undergo continuous non-destructive eddy current testing and periodic hydrostatic pressure checks.

Q: Do you provide sample pieces for mechanical testing and evaluation prior to bulk purchasing?

A: Yes, we offer free short-sample sections for lab testing and visual review, with freight costs borne by the buyer.

Q: What export ports do you predominantly ship from for international orders?

A: We primarily load and ship containers from major coastal ports such as Shanghai, Tianjin, and Qingdao for optimal global routing.

As one of the most professional round steel pipe manufacturers and suppliers in China, we're featured by quality products and good price. Please rest assured to buy cheap round steel pipe for sale here from our factory. Welcome to contact us for customized service.