Carbon Steel Welded Pipe — Factory Direct Supplier | Huaxia-Steel
Huaxia-Steel supplies high-quality carbon steel welded pipe for construction, fluid transmission, structural support, and mechanical applications. Our welded pipes are manufactured to ASTM, API, EN, and JIS standards with full traceability, mill test certificates, and third-party inspection options. Available in ERW (Electric Resistance Welded), EFW (Electric Fusion Welded), and LSAW (Longitudinal Submerged Arc Welded) types, we deliver pipes that meet the most demanding project specifications at competitive factory-direct prices.
Product Overview
Carbon steel welded pipe is manufactured by rolling flat steel plate into a cylindrical shape and welding the seam longitudinally or spirally. Compared to seamless pipe, welded pipe offers significant cost advantages for larger diameters and thinner walls, making it the preferred choice for water pipelines, structural columns, piling, and general fluid transmission. Our welded pipes are produced on modern mills with automated welding, ultrasonic testing, and hydrostatic testing to ensure weld integrity and dimensional accuracy.
Key advantages of our carbon steel welded pipe:
- Factory-direct pricing with no intermediary markups
- ERW, EFW, and LSAW manufacturing capabilities
- Full MTC per EN 10204 3.1 or 3.2 with chemical and mechanical data
- Third-party inspection by SGS, BV, or Intertek available
- Custom cutting, threading, beveling, and coating services
- Export packaging with end caps, VCI film, and steel frame crating
Specifications and Dimensions
| Parameter | Range / Standard |
|---|---|
| Outer Diameter (OD) | 21.3 mm (1/2″) to 610 mm (24″) |
| Wall Thickness | 1.5 mm to 25.4 mm (SCH 10 to SCH 160) |
| Length | 5.8 m, 6.0 m, 11.8 m, 12.0 m, or custom cut |
| Ends | Plain end (PE), Beveled end (BE), Threaded (TBE) |
| Coating | Bare, black paint, hot-dip galvanized, 3LPE/3LPP, FBE |
| Surface | Mill finish, oiled, phosphated, shot-blasted |
| Tolerance | OD: ±0.5 mm; WT: ±10%; Length: ±5 mm |
Available Steel Grades and Standards
| Grade | Standard | Yield (MPa) | Tensile (MPa) | Application |
|---|---|---|---|---|
| A53 Gr A | ASTM A53 | 205 | 330 | General fluid transmission |
| A53 Gr B | ASTM A53 | 240 | 415 | Pressure piping, structural |
| API 5L Gr B | API 5L | 245 | 415 | Oil and gas pipelines |
| API 5L X42 | API 5L | 290 | 415 | Medium-pressure pipelines |
| API 5L X52 | API 5L | 360 | 460 | High-pressure transmission |
| ST37 | DIN 2393 / EN 10305 | 235 | 340-470 | Precision mechanical tubing |
| Q235B | GB/T 3091 | 235 | 370-500 | General construction, water |
| Q345B | GB/T 3091 | 345 | 470-630 | High-strength structural |
Manufacturing Standards
Our carbon steel welded pipes are manufactured and tested in accordance with the following international standards:
- ASTM A53: Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless
- ASTM A135: Electric-Resistance-Welded Steel Pipe
- API 5L: Specification for Line Pipe (PSL1 and PSL2)
- EN 10217: Welded steel tubes for pressure purposes
- EN 10219: Cold formed welded structural hollow sections
- GB/T 3091: Welded steel pipes for low pressure liquid delivery
- GB/T 13793: Longitudinal electric resistance welded steel tubes
- JIS G 3452: Carbon steel pipes for ordinary piping
Applications
Carbon steel welded pipe from Huaxia-Steel is used across a wide range of industries:
- Water and wastewater: Municipal water supply, drainage, irrigation pipelines
- Oil and gas: Transmission pipelines, gathering lines, casing and tubing
- Construction: Structural columns, piling, scaffolding, handrails
- Mechanical: Machinery frames, conveyor rollers, hydraulic cylinders
- Power generation: Steam and condensate lines, cooling water systems
- Fire protection: Sprinkler systems, fire mains per NFPA standards
- HVAC: Heating, ventilation, and air conditioning ductwork and piping
Quality Assurance and Testing
Every batch of welded pipe undergoes comprehensive testing before shipment:
- Chemical composition analysis: Spectrometer testing for C, Mn, Si, P, S, and trace elements
- Tensile testing: Yield strength, tensile strength, and elongation per ASTM A370 or EN ISO 6892
- Flattening test: Verifies ductility and weld integrity per ASTM A53
- Bend test: Confirms weld ductility and freedom from cracks
- Hydrostatic test: Pressure testing at 1.5× working pressure for 5 seconds minimum
- Ultrasonic testing (UT): 100% weld seam inspection for longitudinal defects
- Eddy current testing: Surface and near-surface defect detection for ERW pipes
- Dimensional inspection: OD, wall thickness, length, straightness, and squareness
- Visual inspection: Surface finish, weld bead appearance, and end condition
Packaging and Shipping
We understand that steel pipes must arrive at your project site in perfect condition. Our export packaging is designed to prevent corrosion, deformation, and damage during ocean freight:
- Internal protection: Plastic end caps on both ends to prevent contamination and moisture ingress
- Surface protection: Rust-preventive oil or VCI film wrapping
- External bundling: Steel strapping at 3-4 points per bundle with edge protectors
- Loading: Bundles loaded on wooden skids or steel frames for forklift handling
- Container: 20′ GP (max 25 tons), 40′ GP (max 26 tons), or open-top for oversized pipes
- Break-bulk: Available for orders above 500 tons or pipes exceeding container dimensions
Why Choose Huaxia-Steel for Carbon Steel Welded Pipe?
- Direct mill pricing: No trading company markup — you buy from the manufacturer.
- Full specification range: From 1/2″ to 24″ OD, SCH 10 to SCH 160, in any standard grade.
- Quality certification: ISO 9001, ISO 14001, and API Q1 certified manufacturing.
- Third-party inspection: SGS, Bureau Veritas, Intertek, and TÜV inspections arranged at your request.
- Custom processing: Threading, grooving, beveling, cutting, and coating available in-house.
- Reliable delivery: 30-45 day lead time for standard sizes; 60 days for custom orders.
- Payment flexibility: T/T, L/C at sight, and D/P terms accepted for qualified buyers.
Request a Quote
Contact Huaxia-Steel today with your carbon steel welded pipe requirements. Provide the following information for an accurate quotation:
- Grade and standard (e.g., API 5L Gr B, ASTM A53 Gr A)
- Outer diameter and wall thickness (or pipe schedule)
- Quantity (in meters, pieces, or metric tons)
- Length requirements
- End finish and coating requirements
- Destination port and Incoterms
- Required inspection level and MTC type
Our sales team will respond within 24 hours with a detailed quotation, mill capability confirmation, and delivery schedule. We look forward to being your trusted supplier for carbon steel welded pipe.
