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Product introduction
LSAW Steel Pipes Natural Gas High-pressure Pipeline DN1200 Product Detail Page
Product Description
LSAW Steel Pipes Natural Gas High-pressure Pipeline DN1200 are large-diameter, heavy-duty longitudinal submerged arc welded (LSAW) steel pipes specifically engineered for high-pressure natural gas transmission, with a nominal diameter of DN1200 (Outer Diameter 1220mm). Manufactured in strict compliance with API 5L (PSL1/PSL2), ASTM A106 Gr.B, and ISO 3183 standards, these pipes adopt premium carbon/micro-alloy steel and advanced LSAW technology, featuring deep weld penetration, excellent pressure-bearing capacity, high toughness, and reliable corrosion resistance. Specifically designed for high-pressure (≥10MPa) natural gas trunk lines and large-scale gas transmission projects, they balance durability, safety, and cost-effectiveness, widely used in global onshore/offshore high-pressure natural gas transmission systems, with excellent adaptability to complex and harsh working environments.
Basic Product Specifications
Product Name: LSAW Steel Pipes Natural Gas High-pressure Pipeline DN1200
Executive Standard: API 5L (PSL1/PSL2), ASTM A106 Gr.B, ISO 3183, GB/T 9711 (Customizable per high-pressure project requirements)
Quality Level: PSL2 (API 5L) as standard for high-pressure service, PSL1 optional for general high-pressure scenarios
Manufacturing Process: LSAW (Longitudinal Submerged Arc Welding), steel plate forming, double-sided submerged arc welding, cold expansion (optional for high-pressure optimization)
Steel Grades Available: ASTM A106 Gr.B, API 5L X52/X56/X60 (main grades for high-pressure), customizable to X65 for ultra-high pressure requirements
Key Sizes: Nominal Diameter (DN): 1200mm; Outer Diameter (OD): 1220mm; Wall Thickness (WT): 12mm - 40mm (thick wall customizable up to 60mm for ultra-high pressure)
Delivery Condition: Normalized (standard), Normalized and Tempered (N+T) for ultra-high pressure service, Annealed (optional for low-temperature high-pressure environments)
Standard Length: 12m (standard for DN1200 large-diameter), 6m optional; Custom fixed length available
Surface Finish: Black bare steel with anti-rust oil (internal & external); Fusion Bonded Epoxy (FBE) coating, 3PE/2PE anti-corrosion coating available on request (critical for high-pressure gas transmission)
Pipe Ends: 30°/45° Beveled Ends (BE) for on-site welding (standard for high-pressure connection); Plain Ends (PE) optional; Threaded ends not applicable for DN1200
Application: High-pressure natural gas trunk pipelines, large-scale gas gathering lines, cross-region gas transmission projects, offshore high-pressure gas pipelines, gas storage station main pipelines
Key Grade & Process Explanation
High-Pressure Steel Grades: API 5L X52/X56 and ASTM A106 Gr.B are the core grades for DN1200 high-pressure gas pipes. X52 grade features a minimum yield strength of 360MPa, tensile strength of 460-670MPa, and elongation ≥21%, with a carbon equivalent (Ceq) ≤0.45%, significantly reducing welding cold crack sensitivity and ensuring reliable pressure-bearing performance under high-pressure (≥10MPa) conditions. X60/X65 grades are optional for ultra-high pressure (≥15MPa) projects, providing higher strength and toughness.
LSAW (Longitudinal Submerged Arc Welding) for DN1200: Advanced welding process tailored for large-diameter (DN1200) high-pressure pipes, using high-quality steel plates formed into a cylinder and welded with double-sided submerged arc welding. The process ensures deep weld penetration (full penetration), uniform weld seam, low defect rate, and mechanical properties matching the base metal. The submerged arc welding method effectively isolates the weld from air, reducing oxidation and ensuring weld integrity, which is critical for high-pressure gas transmission to prevent leakage.
High-Pressure & DN1200 Special Design: Optimized for high-pressure natural gas transmission, with strict control of sulfur (≤0.035%) and phosphorus (≤0.035%) content to reduce corrosion and cracking risk; precise dimensional control (especially roundness and wall thickness uniformity) ensures stable pressure distribution in DN1200 large-diameter pipes. VD vacuum degassing treatment is adopted to control hydrogen content below 2ppm, preventing white spot defects and ensuring long-term service life under high-pressure cyclic load.
Dimensional Tolerance (API 5L PSL2 / ASTM A106 Gr.B Standard)
|
Item |
Standard Tolerance (DN1200, OD1220mm) |
|
Outer Diameter (OD) |
±1.0% of nominal OD (±12.2mm), minimum absolute tolerance ±0.5mm |
|
Wall Thickness (WT) |
-10% ~ +15% of nominal thickness (strict control for high-pressure, no negative deviation for WT≥20mm) |
|
Out-of-Roundness |
≤1.2% of nominal outer diameter (≤14.64mm) for high-pressure service |
|
Straightness |
≤2.5 mm per meter length (strict control for DN1200 large-diameter installation) |
|
Standard Length |
+300 mm, -0 mm (Single Random Length for 12m standard) |
Mechanical Properties (API 5L X52, DN1200 High-Pressure Pipe)
|
Mechanical Property |
Standard Requirement (High-Pressure Service) |
|
Minimum Yield Strength ($$R_{eH}$$) |
≥360 MPa (52 ksi) (X52); ≥415MPa (X60); ≥450MPa (X65) |
|
Tensile Strength ($$R_m$$) |
460 – 670 MPa (66.7 – 97.2 ksi) (X52) |
|
Elongation at Break (A) |
≥21% (X52); ≥20% (X60/X65) |
|
Flattening Test |
Qualified, no cracks or defects after testing (conforming to API 5L PSL2 standard) |
|
Hydrostatic Test |
100% pressure test (≥1.5 times working pressure, minimum 15MPa), no leakage or deformation |
|
Weldability |
Excellent, suitable for SMAW, GMAW, SAW and other on-site welding processes, low cold crack sensitivity |
Note: Mechanical properties can be adjusted according to steel grade (X52/X56/X60/X65) and wall thickness, ensuring compatibility with different high-pressure levels (10MPa-20MPa). For ultra-high pressure service (≥15MPa), normalized and tempered (N+T) delivery condition is adopted to enhance toughness and fatigue resistance.
Chemical Composition (Heat Analysis, Max. %, API 5L X52)
|
Element |
C (Carbon) |
Mn (Manganese) |
P (Phosphorus) |
S (Sulfur) |
Si (Silicon) |
|
Limit |
≤0.24 |
≤1.40 |
≤0.035 |
≤0.035 |
≤0.45 |
Residual elements: Cu ≤0.50%, Ni ≤0.30%, Cr ≤0.30%, Mo ≤0.15% (max. %); LF furnace refining with calcium treatment is adopted to optimize sulfide morphology, improving material anisotropy and fatigue resistance under high-pressure cyclic load. Customizable chemical composition for harsh high-pressure environments.
Manufacturing Process (LSAW for DN1200 High-Pressure Pipe)
Raw Material Selection: High-quality API 5L X52/X56 or ASTM A106 Gr.B steel plates, strictly inspected for chemical composition and mechanical properties. The plates undergo VD vacuum degassing treatment to control hydrogen content, ensuring suitability for DN1200 high-pressure gas transmission pipe production.
Plate Forming: Steel plates are cold-formed into cylindrical shape with precise dimensional control, using intelligent temperature-controlled stepping heating furnace (±5℃ precision) to ensure uniform wall thickness and roundness, with ellipse degree meeting API 5L PSL2 level (≤1.2% of OD).
LSAW Welding: Double-sided submerged arc welding is used to achieve full-penetration longitudinal welding. The weld seam is heated and normalized (900-930℃) to eliminate internal stress, ensure weld quality, and make the weld seam mechanical properties consistent with the base metal. For ultra-high pressure pipes, post-weld heat treatment (PWHT) is added to further reduce residual stress.
Sizing & Straightening: Precision sizing to meet API 5L PSL2 dimensional tolerances; hydraulic straightening to ensure straightness ≤2.5 mm/m, facilitating on-site installation and docking of DN1200 large-diameter pipes with high-pressure fittings.
Non-Destructive Testing (NDT): 100% Ultrasonic Testing (UT) of weld seams and pipe body; Radiographic Testing (RT) of 100% weld seams for high-pressure service (per API 5UT and API 5RT standards). Full tube body ray detection adopts Se-75 source for high detection accuracy, ensuring no internal defects.
Heat Treatment: Normalization treatment as standard; Normalized and Tempered (N+T) treatment optional for ultra-high pressure service to improve toughness and fatigue resistance. Computer-controlled heat treatment furnace adjusts transmission speed according to wall thickness to ensure uniform heat treatment effect.
Finishing: Internal and external anti-rust oil coating to prevent corrosion during storage and transportation; FBE/3PE anti-corrosion coating available on request (critical for high-pressure gas transmission); end beveling (30°/45°) and marking to complete the production process.
Product Advantages
High-Pressure Reliability: Adopting API 5L X52/X56 grades and PSL2 quality level, with excellent pressure-bearing capacity (≥10MPa), suitable for high-pressure natural gas transmission, ensuring no leakage under long-term high-pressure cyclic load.
DN1200 Large-Diameter Advantage: Optimized for DN1200 (OD1220mm) large-diameter design, high flow capacity, ideal for large-scale gas trunk lines and cross-region gas transmission projects, reducing pipeline laying costs.
LSAW Weld Quality: Double-sided submerged arc welding, full penetration, 100% NDT inspection, low defect rate, weld seam mechanical properties matching base metal, ensuring long-term stability for high-pressure service.
Excellent Corrosion Resistance: Low sulfur and low phosphorus composition, combined with optional FBE/3PE anti-corrosion coating, reduces corrosion risk in complex high-pressure gas transmission environments, extending service life to 30+ years.
Precise Dimensional Control: Strict control of roundness, wall thickness uniformity and straightness, ensuring seamless connection and stable pressure distribution in DN1200 large-diameter high-pressure pipelines.
Standard Compliance: Fully compliant with API 5L (PSL1/PSL2), ASTM A106 Gr.B and ISO 3183 standards, recognized by global high-pressure gas engineering projects, with complete certification documents.
Full Traceability: Complete heat number and batch records, with Mill Test Report (MTR) provided for each order, ensuring quality traceability and supporting project acceptance and customs clearance. Full-process quality control with 3D laser scanning for dimensional accuracy.
Main Applications
Specialized for high-pressure (≥10MPa) natural gas transmission, widely used in:
High-pressure natural gas trunk pipelines (onshore/offshore) with DN1200 large diameter.
Cross-region and inter-city high-pressure gas transmission projects.
Gas storage stations and high-pressure gas transmission station main pipelines.
Offshore high-pressure natural gas gathering and transmission pipelines (with anti-corrosion coating).
Large-scale industrial high-pressure natural gas supply pipelines.
Ultra-high pressure (≥15MPa) natural gas transmission projects (with X60/X65 grade and N+T treatment).
Quality Inspection & Certification
Dimensional Inspection: Full inspection of outer diameter, wall thickness, length, straightness and out-of-roundness to meet API 5L PSL2 tolerance requirements, especially strict control for DN1200 large-diameter and high-pressure service.
Mechanical Property Testing: Tensile test, flattening test, bend test to verify yield strength, tensile strength and ductility; Charpy V-notch impact test (≥27J at 0℃) mandatory for high-pressure service; high-temperature tensile test optional for harsh environments.
Hydrostatic Test: 100% pressure test at ≥1.5 times working pressure (minimum 15MPa), holding time per API 5L standard, ensuring no leakage or permanent deformation.
Non-Destructive Testing (NDT): 100% Ultrasonic Testing (UT) for weld seams and pipe body; 100% Radiographic Testing (RT) for weld seams; MT/PT testing available on request to ensure weld integrity.
Chemical Analysis: Heat analysis to confirm chemical composition meets API 5L X52/X56 and ASTM A106 Gr.B requirements, including strict control of harmful elements and carbon equivalent.
Certification: Mill Test Report (MTR) provided for each order, with full heat number traceability; third-party inspection (SGS, BV) available on request to meet global high-pressure project acceptance standards.
Packaging & Delivery
Packaging: DN1200 large-diameter pipes are bundled with heavy-duty steel strips (4-6 strips per bundle), wrapped with waterproof woven cloth to prevent rust and damage during transportation; high-strength plastic end caps installed to protect pipe ends and internal surfaces (critical for high-pressure gas transmission); custom packaging available for bulk orders.
Marking: Each pipe is clearly marked with API 5L PSL2, LSAW, DN1200 (OD1220mm), steel grade, size (OD×WT), heat number, batch number, length, manufacturing date and "High-Pressure Natural Gas Pipe" identification.
Trade Terms: FOB, CIF, CFR, DAP, DDU all available, supporting various international trade cooperation methods.
Shipping Ports: Major Chinese coastal ports (Qingdao, Tianjin, Shanghai, Ningbo), with professional loading equipment for DN1200 large-diameter pipes, ensuring efficient and convenient global transportation.
Customization: Accept customized steel grades (X52/X56/X60/X65), wall thickness (12mm-60mm), lengths, pipe ends, and anti-corrosion coating (FBE/3PE) to meet specific DN1200 high-pressure natural gas pipeline project requirements.
Contact Us
For quotation, stock availability, delivery lead time, and customized services of LSAW Steel Pipes Natural Gas High-pressure Pipeline DN1200, please contact our sales team. We provide professional high-pressure gas transmission pipeline solutions with API/ASTM-standard quality, supporting your global large-scale high-pressure natural gas transmission projects with reliable products and comprehensive services.
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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