Hebei Huayang Steel Pipe Co., Ltd is one of the most experienced manufacturers and suppliers of lsaw gb/t 9711.1 x46 carbon steel pipe in China. Welcome to buy discount lsaw gb/t 9711.1 x46 carbon steel pipe made in China here from our factory. Quality products and low price are available.
Product introduction
Product Description
LSAW GB/T 9711.1 X46 Carbon Steel Pipe is a high-performance longitudinal submerged-arc welded carbon steel pipe, specially developed in strict accordance with GB/T 9711.1 standard (Petroleum and Natural Gas Industry - Steel Pipe for Pipeline Transportation Systems - Part 1: Steel Pipe for Non-Corrosive and Non-Offshore Service). As a core grade in GB/T 9711.1, X46 (corresponding to L320 in the standard, with a minimum yield strength of 320MPa) adopts high-quality carbon and low-alloy steel plates and advanced double-sided submerged-arc welding (LSAW) technology. It features excellent pressure-bearing capacity, stable weld quality, good low-temperature toughness, and reliable corrosion resistance, which is widely used in onshore oil and gas gathering and transmission pipelines, medium-pressure fluid transportation, and industrial pipeline systems. This product perfectly complies with the technical requirements of GB/T 9711.1, providing safe, durable and cost-effective pipeline solutions for domestic and international oil and gas, chemical and municipal infrastructure projects.
Basic Product Specifications
Product Name: LSAW GB/T 9711.1 X46 Carbon Steel Pipe
Executive Standard: GB/T 9711.1 (Petroleum and Natural Gas Industry - Steel Pipe for Pipeline Transportation Systems - Part 1), compatible with API 5L PSL1/PSL2
Manufacturing Process: LSAW (Longitudinal Submerged Arc Welding), plate cold forming, double-sided SAW welding, cold expansion, weld normalization, stress relief (optional)
Steel Grade: GB/T 9711.1 X46 (L320), equivalent to API 5L X46, can be customized with X42/X52 for matching projects
Outer Diameter (OD): 219 mm – 1422 mm
Wall Thickness (WT): 8 mm – 40 mm, custom thick-wall up to 50 mm for high-pressure service
Standard Length: 12 m (standard), 6 m/9 m optional, custom fixed lengths available
Delivery Condition: Normalized (standard); Stress-relieved for low-temperature (-10℃ to 0℃) and cyclic pressure environments; Hot-rolled or thermomechanically rolled available for PSL1 service
Surface Finish: Black bare steel with anti-rust oil; 3PE, 2PE, FBE anti-corrosion coating optional (adapt to soil and chemical corrosion)
Pipe End: 30°/45° beveled ends for field welding; plain ends, threaded ends (BTC/LC) optional
Application: Onshore oil and gas gathering and transmission pipelines, medium-pressure natural gas trunk lines, refinery process pipelines, chemical fluid transportation pipelines, municipal gas main pipelines, water conservancy and water supply pipelines, power plant circulating water pipelines
Grade & Process Explanation
X46 Steel Grade (GB/T 9711.1): X46 (L320) is a core grade specified in GB/T 9711.1, with a minimum yield strength of 320MPa and tensile strength of 435-655MPa, featuring excellent weldability and pressure-bearing capacity for medium-pressure (8-16MPa) pipeline service. Its low-sulfur (≤0.015%) and low-phosphorus (≤0.025%) composition effectively improves resistance to sulfide stress corrosion cracking, making it suitable for general oil and gas transmission and non-corrosive fluid transportation. Compared with X42, X46 has higher strength and better impact toughness, while being more cost-effective than X52, which is the preferred grade for medium-pressure pipeline projects.
LSAW Process Advantages: Adopting single steel plate cold forming + double-sided full-penetration submerged-arc welding, avoiding longitudinal splicing defects and ensuring that the mechanical properties of the weld seam are consistent with the base metal. The post-weld normalization heat treatment eliminates internal residual stress, and the cold expansion process optimizes the roundness and wall thickness uniformity of the pipe, greatly improving the long-term pressure-bearing safety and structural stability of the buried pipeline, which is fully compatible with the manufacturing requirements of GB/T 9711.1 standard for welded pipes.
GB/T 9711.1-Oriented Design: Strictly follow the dimensional tolerance, mechanical properties and inspection requirements of GB/T 9711.1, ensuring that the pipe can be perfectly matched with valves, flanges and other pipeline components. The smooth inner surface reduces fluid resistance and medium deposition, and the optional multi-layer anti-corrosion coating adapts to complex working environments such as soil and chemical media, extending the service life of the pipeline to more than 30 years. It can also be used for transporting steam, water and other non-flammable fluids besides oil and gas, with strong versatility.
Dimensional Tolerance (GB/T 9711.1 Standard)
|
Item |
Tolerance |
|
Outer Diameter |
±1.0% of nominal OD, max ±12 mm for OD＞1000 mm |
|
Wall Thickness |
+15% / −12.5% of nominal WT, min allowable WT ≥ 80% of nominal WT |
|
Out-of-Roundness |
≤1.0% of outer diameter (for OD≤508 mm); ≤1.2% of outer diameter (for OD＞508 mm) |
|
Straightness |
≤2.0 mm per meter, ≤24 mm for 12 m length |
|
Length |
+300 mm / −0 mm, custom ±50 mm available |
Mechanical Properties (GB/T 9711.1 X46 Reference)
|
Property |
Standard Requirement (GB/T 9711.1) |
|
Minimum Yield Strength |
≥320 MPa (X46/L320); Yield ratio ≤0.93 |
|
Tensile Strength |
435 – 655 MPa |
|
Elongation |
≥21% |
|
Hydrostatic Test |
100% tested at 1.5× working pressure, holding time ≥30 minutes, no leakage or permanent deformation |
|
Charpy Impact (V-notch) |
≥27 J at 0℃ (PSL2 mandatory); ≥20 J at -10℃ (optional for low-temperature service) |
|
Flattening / Bend Test |
No cracks, weld separation or defects after testing, complying with GB/T 9711.1 requirements |
Chemical Composition (Max. %, GB/T 9711.1 X46)
|
Element |
C |
Mn |
P |
S |
Si |
|
X46 (L320) |
≤0.20 |
≤1.40 |
≤0.025 |
≤0.015 |
≤0.35 |
|
X46 (PSL2) |
≤0.18 |
1.10-1.40 |
≤0.020 |
≤0.010 |
0.15-0.35 |
Residual elements: Cu ≤0.50%, Ni ≤0.30%, Cr ≤0.30%, Mo ≤0.15% (max. %). LF furnace refining with calcium treatment is adopted to reduce non-metallic inclusions, improve weld quality and corrosion resistance, and strictly control harmful elements to ensure that the pipe will not cause contamination to oil, gas, water and other media, fully meeting the requirements of GB/T 9711.1 for pipeline steel composition.
Manufacturing Process
Raw Material Inspection: Select high-quality X46 (L320) carbon steel plates that comply with GB/T 9711.1 standard, and strictly inspect the chemical composition and mechanical properties before production. The steel plates undergo pickling, derusting and oil removal to eliminate surface impurities, ensuring weld quality and avoiding fluid contamination.
Plate Forming: The steel plates are cold-formed into a cylindrical shape through intelligent forming rolls, with precise dimensional control to ensure uniform wall thickness and roundness, and the out-of-roundness meets the requirements of GB/T 9711.1 standard, laying a foundation for subsequent welding and pipeline connection.
Double-sided LSAW Welding: Double-sided submerged-arc welding is used to achieve full-penetration longitudinal welding. The weld seam undergoes normalization heat treatment (850-900℃) to eliminate internal stress, ensuring that the mechanical properties of the weld seam are consistent with the base metal, which is critical for preventing leakage in medium-high pressure transmission. Weld seam 100% online ultrasonic testing (UT) is performed to eliminate welding defects such as cracks and incomplete fusion.
Cold Expansion: The formed and welded pipe undergoes cold expansion treatment to improve roundness, reduce residual stress, and enhance the uniformity of wall thickness. This process greatly improves the long-term pressure-bearing reliability of the pipe, adapting to the load of buried installation and long-distance transmission.
NDT Inspection: 100% Ultrasonic Testing (UT) of weld seams and pipe body; Radiographic Testing (RT) is optional for high-safety projects (such as long-distance oil-gas trunk lines), fully complying with the non-destructive testing requirements of GB/T 9711.1.
Hydrostatic Test: 100% pressure test is carried out at ≥1.5 times the working pressure, with a holding time of 30-60 minutes according to GB/T 9711.1 standard, ensuring no leakage or permanent deformation, which is critical for the safety of the pipeline.
Heat Treatment (Optional): As-welded + normalized delivery is standard; stress-relieved heat treatment is optional for low-temperature environments and severe pressure cycles. The computer-controlled heat treatment furnace adjusts parameters according to X46 steel grade to ensure a uniform heat treatment effect, meeting the delivery state requirements of GB/T 9711.1.
Finishing: Internal and external anti-rust oil coating is applied to prevent corrosion during storage and transportation; 3PE/FBE anti-corrosion coating is available on request. Pipe ends are beveled (30°/45°) or processed into flanged/threaded ends, and clear marking is carried out to complete the production process.
Product Advantages
Strict GB/T 9711.1 Compliance: Fully manufactured in accordance with GB/T 9711.1 standard, with complete certification documents, which is compatible with domestic and international project acceptance, and is the preferred product for medium-pressure pipeline projects that require compliance with national standards.
X46 Grade High Performance: With reasonable strength matching (yield strength ≥320MPa), excellent weldability and low-temperature toughness, it balances pressure-bearing capacity and economy, suitable for various medium-pressure oil and gas and fluid transmission scenarios, and has strong versatility.
Stable LSAW Weld Quality: Double-sided submerged-arc welding with normalization treatment, weld mechanical properties consistent with the base metal, low defect rate, high structural stability, adapting to the long-term cyclic pressure of buried pipelines.
Precise Dimensional Accuracy: Strict tolerance control of outer diameter, wall thickness and roundness in accordance with GB/T 9711.1, ensuring seamless connection with flanges, valves and other pipeline components, reducing on-site installation errors and improving construction efficiency.
Strong Environmental Adaptability: Optional 3PE/FBE anti-corrosion coating resists soil corrosion, chemical corrosion and atmospheric corrosion, adapting to buried, industrial and municipal environments, extending service life to over 30 years.
Wide Specification Range: Covers small-medium to large-diameter sizes (OD 219mm-1422mm), which can meet the diversified needs of onshore oil and gas gathering and transmission, municipal and industrial pipeline projects.
Complete Quality Traceability: Complete heat number and batch records, Mill Test Report (MTR) provided for each order; third-party inspection (SGS, BV, CCS) available, ensuring quality traceability and project safety, complying with the traceability requirements of GB/T 9711.1 standard.
Cost-Effective & Customizable: LSAW process has high production efficiency, balancing performance and economy for large-scale projects; accept custom specifications (OD, WT, length), delivery state and anti-corrosion coating to meet specific project requirements.
Main Applications
Onshore oil and gas gathering and transmission pipelines, medium-pressure natural gas trunk lines
Petrochemical refinery process pipelines, chemical fluid (non-corrosive) transportation pipelines
Municipal gas main pipelines, urban water supply and drainage trunk lines
Water conservancy project water delivery pipelines, reservoir connecting pipelines
Power plant circulating water pipelines, boiler water supply and drainage pipelines
Industrial fluid transmission pipelines (steam, compressed air, etc.)
General medium-pressure fluid transportation projects that comply with GB/T 9711.1 standard
Quality Inspection & Certification
Dimensional Inspection: Full inspection of outer diameter, wall thickness, length, straightness and out-of-roundness to meet GB/T 9711.1 standard, ensuring compatibility with pipeline components.
Mechanical Property Testing: Tensile test, flattening test, bend test, hydrostatic test, and Charpy V-notch impact test (mandatory for PSL2) to verify product mechanical performance and pressure-bearing capacity, in line with GB/T 9711.1 technical requirements.
Non-Destructive Testing (NDT): 100% Ultrasonic Testing (UT) for weld seams and pipe body; Radiographic Testing (RT) optional for high-safety projects; Eddy Current Testing (ECT) for surface defect inspection, complying with the NDT specifications of GB/T 9711.1.
Chemical Analysis: Heat analysis to confirm chemical composition meets GB/T 9711.1 X46 grade requirements, strict control of harmful elements and non-metallic inclusions, ensuring product quality and corrosion resistance.
Certification: Mill Test Report (MTR) provided for each order, with full heat number traceability; third-party inspection (SGS, BV, CCS) available on request to meet global project acceptance standards, and GB/T 9711.1 certification documents can be provided as required.
Packaging & Delivery
Packaging: Pipes are bundled with heavy-duty steel strips (8-12 strips per bundle), wrapped with waterproof and dust-proof woven cloth to prevent rust and damage during transportation and on-site storage; high-strength plastic or steel end caps are installed to protect pipe ends and internal surfaces, avoiding dust and moisture contamination.
Marking: Each pipe is clearly marked with GB/T 9711.1, LSAW, X46, outer diameter, wall thickness, size (OD×WT), heat number, batch number, length, manufacturing date, and "LSAW GB/T 9711.1 X46 Carbon Steel Pipe" identification, facilitating on-site identification and management, complying with the marking requirements of GB/T 9711.1.
Trade Terms: FOB, CIF, CFR, DAP, DDU all available, supporting various international trade cooperation methods for domestic and global medium-pressure pipeline projects.
Shipping Ports: Major Chinese coastal ports (Tianjin, Qingdao, Shanghai, Ningbo), with professional loading equipment for large-diameter pipes, ensuring efficient and convenient global transportation, supporting timely delivery for project schedules.
Customization: Accept customized outer diameter (219mm-1422mm), wall thickness (8mm-50mm), lengths (matching project design), pipe ends (custom bevel angles/flanged/threaded ends), and anti-corrosion coating (3PE/FBE) to meet specific GB/T 9711.1 X46 pipeline project requirements.
Contact Us
For quotation, stock availability, delivery lead time, and customized solutions of LSAW GB/T 9711.1 X46 Carbon Steel Pipe, please contact our sales team. We have rich experience in supporting domestic and global medium-pressure pipeline projects (oil-gas, municipal, chemical), providing GB/T 9711.1-compliant X46 grade LSAW carbon steel pipes, and professional technical support for on-site installation, pressure testing, and anti-corrosion treatment, ensuring the safe and stable operation of your pipeline systems.
About us
Hebei Huayang Steel Pipe Co., Ltd. was founded in 2005, with a registered capital of 500 million yuan. The company covers an area of more than 1,000 mu, with annual sales of 10 billion yuan, more than 600 employees and an annual productivity of 2.75 million tons. The company has 17 new automatic steel pipe production lines and 14 high-frequency production lines, with a diameter of 73-660 mm; Three double-sided submerged arc welded steel pipe production lines with diameters of 406.4-1422.4mm;; 24 hot tube expanding production lines, with a diameter of 230-820mm; Two anticorrosion steel pipe production lines with a diameter of 73-1626 mm; 2 automatic painting production lines. With 3 branches and 5 offices, the products are sold to various cities and exported to more than 80 countries such as Southeast Asia, Middle East, Europe and America.
Packaging, transportation and delivery
Packaging, transportation and delivery
At Hebei Huayang Steel Pipe Co., Ltd., we apply standardized and reliable packaging solutions for all our steel pipe products. Our pipes can be securely packed by hexagonal bundling or circular bundling according to product diameter, wall thickness and customer requirements. Each pipe end is protected with high‑strength plastic pipe caps to avoid collision damage, dust and moisture during transportation and storage. The whole bundle is firmly wrapped with durable woven bags to enhance stability and prevent scratches or deformation.
We support a complete range of transportation methods to satisfy global customers, including road transportation, railway transportation, sea freight and container shipping. Based on our strategic location in Cangzhou, Hebei Province, we enjoy convenient access to major ports such as Tianjin Port, which greatly improves logistics efficiency and reduces transportation costs.
For standard specifications and normal order quantities, the general delivery time is about 30 days after order confirmation and deposit receipt. For large‑scale orders, special sizes or customized processing requirements, our production and sales team will formulate a detailed production plan and provide an accurate delivery schedule accordingly to ensure on‑time supply and stable performance for projects and clients worldwide.
Strict quality control
1. During and after the production, experienced quality inspectors randomly check the products to ensure that each steel pipe is qualified for production and application.
2. A nationally recognized laboratory with CNAS certification and certification by French Classification Society.
3. Have CNOOC access certificate, KOC oil company access network, ADNOC Abu Dhabi oil company access network, Petrobras access network, etc.
4. Accept the inspection by the third party designated/paid by the buyer, such as SGS and BV.
Certifications
API 2B
API 5L
GOST
ISO 9001
EN 10219
EN 10210
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