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Product introduction
LSAW Steel Pipes Gas Transmission ASTM A106 Gr.B Product Detail Page
Product Description
LSAW Steel Pipes Gas Transmission ASTM A106 Gr.B are high-performance, heavy-duty welded steel pipes specifically engineered foronshore and offshore natural gas transmission, manufactured in strict compliance with ASTM A106 Gr.B (American Standard) and API 5L supplementary requirements. Adopting Longitudinal Submerged Arc Welding (LSAW) technology, combined with premium ASTM A106 Gr.B carbon steel, these pipes feature deep weld penetration, excellent pressure-bearing capacity, high toughness, and reliable corrosion resistance. Specifically designed for medium to high-pressure gas transmission scenarios, they balance durability, safety, and cost-effectiveness, widely used in global natural gas gathering lines, trunk pipelines, and gas station auxiliary systems, with excellent adaptability to complex working environments.
Basic Product Specifications
Product Name: LSAW Steel Pipes Gas Transmission ASTM A106 Gr.B
Executive Standard: ASTM A106 Gr.B, API 5L (PSL1/PSL2 optional), ISO 3183 (Customizable per project requirements)
Quality Level: ASTM A106 Gr.B standard, PSL1/PSL2 (API 5L) optional for higher requirements
Manufacturing Process: LSAW (Longitudinal Submerged Arc Welding), steel plate forming, double-sided submerged arc welding
Steel Grades Available: ASTM A106 Gr.B (main grade), customizable to X42/X52 for special pressure requirements
Common Sizes: Outer Diameter (OD): 219mm - 1626mm; Wall Thickness (WT): 6mm - 50mm (thick wall customizable up to 80mm)
Delivery Condition: Normalized (standard for ASTM A106 Gr.B), Annealed (optional for harsh environments)
Standard Length: 6m / 12m (Single Random Length, Custom fixed length available)
Surface Finish: Black bare steel with temporary anti-rust oil (internal & external); Hot-dip galvanizing (HDG), Fusion Bonded Epoxy (FBE) coating available on request for corrosion protection
Pipe Ends: Plain Ends (PE) / 30°/45° Beveled Ends (BE) for on-site welding; Threaded ends optional for small diameters
Application: Onshore/offshore natural gas transmission, gas gathering lines, gas trunk pipelines, gas station auxiliary pipelines
Key Grade & Process Explanation
ASTM A106 Gr.B: A premium carbon steel grade for pressure service, with excellent mechanical properties and weldability. It features a minimum yield strength of 240 MPa, tensile strength of 415-620 MPa, and elongation ≥30%, along with a carbon equivalent (Ceq) ≤0.43% that significantly reduces welding cold crack sensitivity, making it ideal for gas transmission pipelines requiring high safety and reliability[2]. The grade also offers excellent high-temperature anti-creep performance, adapting to the temperature fluctuations in gas transmission processes.
LSAW (Longitudinal Submerged Arc Welding): Advanced welding process using steel plate forming and double-sided submerged arc welding. It features deep weld 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, making it suitable for large-diameter, thick-wall gas transmission pipes that require high pressure-bearing capacity and long-term stability.
Gas Transmission Special Design: Optimized for natural gas transmission, with low sulfur and low phosphorus chemical composition to reduce corrosion and cracking risk; strict dimensional control and hydrostatic testing ensure leak-proof performance, meeting the safety requirements of gas transmission. The pipes are also processed with VD vacuum脱气 treatment to control hydrogen content below 2ppm, preventing白点 defects and ensuring long-term service life.
Dimensional Tolerance (ASTM A106 Gr.B Standard)
|
Item |
Standard Tolerance |
|
Outer Diameter (OD) |
±1.0% of nominal OD (minimum absolute tolerance ±0.5mm) |
|
Wall Thickness (WT) |
-12.5% ~ +15% of nominal thickness (thick wall special control for gas transmission) |
|
Out-of-Roundness |
≤1.5% of nominal outer diameter |
|
Straightness |
≤3.2 mm per meter length |
|
Standard Length |
+500 mm, -0 mm (Single Random Length) |
Mechanical Properties (ASTM A106 Gr.B, LSAW Gas Pipe)
|
Mechanical Property |
Standard Requirement |
|
Minimum Yield Strength ($$R_{eH}$$) |
≥240 MPa (35 ksi) |
|
Tensile Strength ($$R_m$$) |
415 – 620 MPa (60 – 90 ksi) |
|
Elongation at Break (A) |
≥30% |
|
Flattening Test |
Qualified, no cracks or defects after testing (conforming to ASTM A106 standard) |
|
Hydrostatic Test |
100% pressure test (≥1.5 times working pressure), no leakage or deformation |
|
Weldability |
Excellent, suitable for SMAW, GMAW, SAW and other on-site welding processes, with low cold crack sensitivity due to optimized carbon equivalent |
Note: Mechanical properties can be adjusted according to wall thickness and additional requirements (such as PSL2), ensuring compatibility with different gas transmission pressure levels. The grade also maintains excellent high-temperature持久强度, with a fracture stress of ≥80MPa when working at 540℃ for 100,000 hours.
Chemical Composition (Heat Analysis, Max. %, ASTM A106 Gr.B)
|
Element |
C (Carbon) |
Mn (Manganese) |
P (Phosphorus) |
S (Sulfur) |
Si (Silicon) |
|
Limit |
≤0.30 |
0.29 – 1.06 |
≤0.035 |
≤0.035 |
≤0.10 – 0.35 |
Residual elements: Cu ≤0.40%, Ni ≤0.40%, Cr ≤0.40%, Mo ≤0.15% (max. %); LF炉精炼的钙处理工艺 is adopted to optimize sulfide morphology, improving material anisotropy. Customizable for special corrosion-resistant requirements in harsh gas transmission environments.
Manufacturing Process (LSAW)
Raw Material Selection: High-quality ASTM A106 Gr.B carbon steel plates, strictly inspected for chemical composition and mechanical properties. The plates undergo VD vacuum脱气 treatment to control hydrogen content, ensuring suitability for gas transmission pipe production.
Plate Forming: Steel plates are cold/hot formed into cylindrical shape with precise dimensional control, using intelligent温控步进式加热炉 (±5℃ precision) to ensure uniform wall thickness and roundness, with ellipse degree meeting API 5L PSL2 level.
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. The welding process effectively isolates the weld from air, reducing oxidation and defects.
Sizing & Straightening: Precision sizing to meet ASTM A106 dimensional tolerances; straightening to ensure straightness ≤3.2 mm/m, facilitating on-site installation and docking with gas transmission fittings.
Non-Destructive Testing (NDT): 100% Ultrasonic Testing (UT) of weld seams; Radiographic Testing (RT) available on request to detect internal cracks, inclusions and other defects. Ultrasonic testing is performed in accordance with API 5UT standard, and full tube body ray detection adopts Se-75 source for high detection accuracy.
Heat Treatment: Normalization treatment as standard to improve mechanical properties, reduce internal stress, and enhance toughness and weldability of the pipe. Annealing treatment is optional for pipes used in low-temperature or harsh corrosion environments, with computer-controlled heat treatment furnace adjusting transmission speed according to wall thickness.
Finishing: Internal and external anti-rust oil coating to prevent corrosion during storage and transportation; custom anti-corrosion coating (HDG, FBE) available on request; end finishing (plain or beveled) and marking to complete the production process.
Product Advantages
ASTM A106 Gr.B Reliability: Premium carbon steel grade with excellent mechanical properties, high toughness, and low welding cold crack sensitivity, fully compliant with gas transmission safety requirements. It also has excellent high-temperature anti-creep performance, adapting to temperature fluctuations in gas transmission[2].
LSAW Weld Quality: Double-sided submerged arc welding, deep weld penetration, uniform weld seam, low defect rate, and 100% NDT inspection, ensuring reliable pressure-bearing capacity and leak-proof performance for gas transmission.
Large Diameter & Thick Wall Capability: Suitable for large-diameter (up to 1626mm) and thick-wall (up to 80mm) requirements, ideal for medium to high-pressure gas trunk lines and gathering lines.
Good Corrosion Resistance: Low sulfur and low phosphorus composition, combined with optional anti-corrosion coatings, reduces corrosion risk in complex gas transmission environments, extending service life. The raw material processing ensures low harmful element content, further enhancing corrosion resistance.
Excellent Weldability & Machinability: Easy for on-site welding, cutting, and secondary fabrication, adapting to various gas transmission pipeline construction scenarios, with optimized carbon equivalent ensuring convenient on-site operation.
Standard Compliance: Fully compliant with ASTM A106 Gr.B and API 5L standards, recognized by global 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. The production process adopts full-process quality control, with 100-point/㎡ measurement density using 3D laser scanner for dimensional accuracy.
Main Applications
Specialized for medium to high-pressure natural gas transmission, widely used in:
Onshore and offshore natural gas trunk pipelines and gathering lines.
Gas storage stations and gas transmission station auxiliary pipelines.
Petrochemical plant gas transmission and distribution pipelines.
Low-temperature and high-altitude gas transmission projects (with optional annealing treatment).
Municipal natural gas main pipelines and industrial gas transmission systems.
High-pressure gas transmission projects requiring high safety and long service life, such as supercritical gas transmission systems.
Quality Inspection & Certification
Dimensional Inspection: Full inspection of outer diameter, wall thickness, length, straightness and out-of-roundness to meet ASTM A106 Gr.B tolerance requirements, especially strict control for gas transmission safety.
Mechanical Property Testing: Tensile test, flattening test, bend test to verify yield strength, tensile strength and ductility; impact test available on request. High-temperature tensile test (300℃) and Charpy V-notch impact test are optional for harsh working conditions.
Hydrostatic Test: 100% pressure test at ≥1.5 times working pressure, holding time per ASTM A106 standard, ensuring no leakage or permanent deformation.
Non-Destructive Testing (NDT): 100% Ultrasonic Testing (UT) for weld seams; RT/MT/PT testing available on request to ensure weld integrity, with detection standards complying with international norms.
Chemical Analysis: Heat analysis to confirm chemical composition meets 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 project acceptance standards.
Packaging & Delivery
Packaging: Bundled with heavy-duty steel strips, wrapped with waterproof woven cloth to prevent rust and damage during transportation; end caps installed to protect pipe ends and internal surfaces (critical for gas transmission); custom packaging available for bulk and large-diameter orders.
Marking: Each pipe is clearly marked with ASTM A106 Gr.B, LSAW, size (OD×WT), heat number, batch number, length, manufacturing date and "Gas Transmission 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), ensuring efficient and convenient global transportation, with sufficient inventory and stable delivery cycle.
Customization: Accept customized steel grades, sizes, wall thickness, lengths, pipe ends (beveled/threaded), and anti-corrosion coating (HDG, FBE) to meet specific gas transmission project requirements.
Contact Us
For quotation, stock availability, delivery lead time, and customized services ofLSAW Steel Pipes Gas Transmission ASTM A106 Gr.B, please contact our sales team. We provide professional gas transmission pipeline solutions with ASTM-standard quality, supporting your global 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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