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

Black Steel Pipe Manufacturer & Supplier in China

At CXC Steel, we engineer and supply a complete portfolio of black steel pipes and tubes, including Black Welded Steel Pipe, Black ERW Steel Pipe, Standard Black Pipe, Black Round Steel Pipe, Black Square Steel Tube, and Black Rectangular Steel Tube.

Black Welded Steel Pipe
Black Welded Steel Pipe is manufactured through high-quality steel strip forming and welding processes to provide reliable strength, stable dimensions, and cost-effective solutions for structural and
Black ERW Steel Pipe
Black ERW Steel Pipe is manufactured through high-frequency electric resistance welding technology, using steel strips formed into tubes and welded under controlled production conditions. The ERW
Standard Black Pipe
Standard Black Pipe is an ERW welded steel pipe designed for structural and fabrication applications, providing dependable performance, dimensional consistency, and economical material selection for
Black Rectangular Steel Tube
Black Rectangular Steel Tube is manufactured by high-frequency welding using hot-rolled carbon steel strip, providing consistent dimensions, reliable weld quality, and stable mechanical performance
Black Round Steel Pipe
Black Round Steel Pipe provides reliable dimensional accuracy, consistent weld quality, and flexible customization. Available in multiple sizes and steel grades, it helps simplify fabrication and
Black Square Steel Tube
Black Square Steel Tube is manufactured from hot-rolled carbon steel using high-frequency electric resistance welding (ERW), providing consistent dimensions, reliable weld integrity, and stable

What Is Black Steel Pipe?

Black steel pipe is an ungalvanized carbon steel pipe with a natural black iron oxide layer formed during high-temperature manufacturing. This oxide layer provides temporary corrosion protection while maintaining excellent weldability and fabrication performance.

Black Steel Pipe Specifications

Item	Specification Details
Product Name	Black Steel Pipe / Black Steel Tube
Material Grade	Carbon Steel (Q195, Q235, Q355, etc.)
Product Types	Black Welded Steel Pipe, Black ERW Steel Pipe, Standard Black Pipe, Round, Square, and Rectangular Tubes
Manufacturing Process	Electric Resistance Welded (ERW)
Surface Finish	Natural black oxide finish, clean and free of excessive oil stains
Available Shapes	Round, Square, Rectangular
Round Pipe Outer Diameter (OD)	Φ10 mm – Φ508 mm
Square Tube Dimensions	10×10 mm – 400×400 mm
Rectangular Tube Dimensions	20×10 mm – 300×500 mm
Wall Thickness	0.75 mm – 6.0 mm
Standard Length	6 m (Custom lengths available upon request)
Executive Standards	GB/T 3091, GB/T 13793, ASTM A53 equivalent standards
Surface Quality	Clean finish, minor manufacturing dents permissible within standard tolerances
Packaging Details	Secured in sturdy bundles with steel straps, protective lining, and export-standard weatherproofing
Customization Services	Custom sizes, precise lengths, stenciled markings, tailored packaging, and OEM production

Types of Black Steel Pipe

CXC Steel offers a diverse selection of black steel tubular products to match exact project demands across various industries:

01/

Black Welded Steel Pipe: Manufactured by forming steel strips into tubular shapes and welding the longitudinal seam using advanced high-frequency welding technology. Suitable for construction, structural engineering, and general industrial applications.

02/

Black ERW Steel Pipe: Produced using the electric resistance welding (ERW) process without filler metal. Widely used in construction, machinery manufacturing, steel structures, and fabrication projects.

03/

Standard Black Pipe: Designed for general structural and industrial applications. Commonly used by contractors, wholesalers, distributors, and OEM manufacturers.

04/

Black Round Steel Pipe: A round carbon steel pipe widely used in scaffolding, structural frameworks, mechanical equipment, fluid transportation, and agricultural applications.

05/

Black Square Steel Tube: A square hollow section suitable for building structures, equipment frames, warehouse shelving, steel furniture, greenhouses, and other fabrication projects.

06/

Black Rectangular Steel Tube: A rectangular hollow section commonly used in machinery manufacturing, vehicle structures, construction, storage systems, and industrial equipment.

Manufacturing Process

The production of high-quality black steel pipe involves a controlled, multi-stage manufacturing workflow:
Raw Material Preparation: High-grade carbon steel coils are sourced, inspected, and slit to precise widths corresponding to the target pipe dimensions.
Uncoiling and Leveling: Steel strips are uncoiled, flattened, and fed continuously into the production line.
Forming: Roll-forming machines progressively bend the flat steel strip into a circular or shaped tubular profile.
Welding: High-frequency Electric Resistance Welding (ERW) fuses the edges together under intense pressure without adding external filler materials, creating a seamless metallic bond.
Sizing and Shaping: The welded tube passes through sizing rolls to achieve exact outer diameter, wall thickness, and squareness specifications.
Cooling and Cutting: The continuous pipe is cooled, straightened, and cut precisely to standard lengths (such as 6 m) or custom dimensions.
Inspection and Finishing: Finished pipes undergo non-destructive weld testing, dimensional checks, and surface verification before bundling and export packaging.

Available Sizes & Dimensions

Round Profile

Outer diameters range from Φ10 mm up to Φ508 mm, with wall thicknesses from 0.75 mm to 6.0 mm.

Square Profile

Dimensions span from 10×10 mm up to 400×400 mm.

Rectangular Profile

Dimensions span from 20×10 mm up to 300×500 mm.

Length Options

Standard production length is 6 meters, with customized cutting lengths available upon request.

How to Choose the Right Black Steel Pipe

Define the Application

Choose round pipes for pressure distribution or fluid routing, square tubes for symmetrical frame stability, and rectangular tubes for directional bending loads.

Verify Load Requirements

Select appropriate wall thicknesses (0.75 mm to 6.0 mm) based on structural load calculations.

Confirm Compliance Standards

Ensure the selected material adheres to recognized standards such as GB/T 3091 or GB/T 13793.

Evaluate Environmental Exposure

Plan for protective painting or anti-corrosion sealants if the pipes will be installed in humid or outdoor environments.

Customization Options

CXC Steel supports comprehensive OEM and custom manufacturing services to fit unique project requirements:

Custom Dimensions

Tailored outer diameters, wall thicknesses, and special profile sizes.

Variable Lengths

Cutting to exact customer-specified lengths beyond standard 6 m joints.

Surface Marking

Custom stenciling, company logos, standard numbers, or length markers printed on each pipe.

Specialized Packaging

Bundling reinforced with waterproof wrapping or heavy-duty steel protection for secure long-distance shipping.

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Quality Control

Our rigorous quality assurance framework safeguards product integrity from raw material intake to final dispatch:

Raw Material Testing

Chemical composition and mechanical property checks on incoming steel strips.

Process Monitoring

Real-time weld seam inspection during high-frequency ERW production.

Dimensional Verification

Precision laser and caliper measurements for outer diameter, wall thickness, and straightness.

Final Acceptance

Visual surface examination and bundle verification prior to warehouse release.

Packaging & Shipping

To prevent transit damage during international ocean and land freight, our black steel pipes are securely packaged:

Tightly bound into hexagonal or square bundles using high-strength steel strapping.

Wrapped in protective woven linings or plastic films upon request to block moisture.

Loaded professionally into containers or break-bulk vessels by experienced logistics personnel.

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Frequently Asked Questions

Q: What is the minimum order quantity (MOQ) for custom-sized black steel pipe production?

A: Our standard MOQ typically starts at 5 metric tons per specification, though smaller trial orders can be negotiated based on current mill rolling schedules.

Q: Can CXC Steel provide third-party inspection reports prior to shipment?

A: Yes, we fully cooperate with globally recognized inspection agencies like SGS, BV, and TÜV for pre-shipment verification at the buyer's expense.

Q: What payment terms are accepted for international wholesale orders?

A: We commonly accept irrevocable Letter of Credit (L/C) at sight and Telegraphic Transfer (T/T) with a 30% deposit and 70% balance against copy of Bill of Lading.

Q: How long is the standard production lead time for a 20-foot container load?

A: Standard production and container loading typically take between 15 to 25 days depending on the specific pipe dimensions and surface requirements.

Q: Are Mill Test Certificates (MTC) supplied with every commercial shipment?

A: Yes, an original EN 10204 3.1 Mill Test Certificate detailing chemical composition and mechanical test results is provided with every dispatch.

Q: Do you offer anti-corrosion varnishing or oil coating to prevent transit rust?

A: Yes, we can apply light anti-rust oil or clear varnish coatings upon request to protect the steel surface during extended ocean freight.

Q: Is it possible to print our company logo or specific project codes on the pipe body?

A: Yes, we provide inline inkjet stenciling services to display custom logos, heat numbers, steel grades, and standard details directly on each pipe.

Q: How are mixed container loads (LCL or mixed sizes) handled for distributors?

A: We specialize in combining multiple sizes of round, square, and rectangular tubes into a single FCL container to optimize your inventory costs.

Q: What is your port of loading for export shipments to global destinations?

A: Our primary shipping ports are Tianjin and Qingdao, allowing efficient logistics access to major international trade routes worldwide.

Q: How quickly can your sales team turnaround a formal commercial quotation with freight costs?

A: Complete commercial quotations including FOB or CIF pricing are typically delivered within 2 to 4 hours following receipt of your detailed inquiry.

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