Hebei Huayang Steel Pipe Co., Ltd is one of the most experienced manufacturers and suppliers of hfw alloy carbon straight pipe 76~660mm offshore platform auxiliary tube in China. Welcome to buy discount hfw alloy carbon straight pipe 76~660mm offshore platform auxiliary tube made in China here from our factory. Quality products and low price are available.
Product introduction
Product Overview
Our 76–660mm HFW alloy carbon straight pipes are high-strength marine-grade auxiliary steel tubes professionally developed for offshore platform engineering systems. Adopting optimized high-frequency welding technology and alloy carbon steel formula, this series of offshore tubes features high structural strength, excellent salt spray corrosion resistance, ultra-stable pressure bearing capacity and strong low-temperature toughness, fully adapting to harsh marine working conditions such as offshore high humidity, strong salt spray, wave impact and variable temperature environments.
Manufactured with premium alloy carbon steel with refined component ratio, the HFW straight welded tubes deliver superior mechanical stability, fatigue resistance and marine environmental adaptability compared with ordinary carbon steel pipes. The complete outer diameter range of 76mm to 660mm covers all mainstream specifications for offshore platform auxiliary fluid pipelines, equipment support structures, marine circulating water systems and offshore facility matching piping. Available with customized marine anti-corrosion coating, heavy-duty galvanized treatment and black finished surface, these offshore auxiliary tubes support thick-wall reinforcement and precision fixed-length cutting. With strict marine engineering quality standards and long-term offshore service stability, they are reliable auxiliary pipeline and structural solutions for offshore oil platforms, wind power platforms, marine engineering and coastal deep-sea facilities.
Production Process
Marine-Grade Alloy Carbon Raw Material Selection: Adopt high-purity alloy carbon steel coils with stable chemical composition, low impurity content and enhanced marine corrosion resistance, meeting special mechanical and anti-rust requirements for offshore platform service.
Precision Tolerance Strip Slitting: Alloy steel strips are slit with ultra-tight dimensional control to ensure uniform wall thickness and balanced internal stress, avoiding local structural weakness under complex marine loads.
Heavy-Duty Multi-Pass Cold Forming: Reinforced multi-roll cold forming process ensures excellent roundness, ultra-high straightness and compact pipe body structure, resisting deformation caused by offshore wind load and wave vibration.
High-Stability HFW Welding Technology: Special marine-grade high-frequency welding parameters form narrow and uniform heat-affected zones, creating defect-free high-strength welds whose tensile and fatigue performance fully matches the alloy carbon steel base metal.
Full Internal & External Weld Micro-Polishing: Complete trimming and fine polishing of inner and outer welding beads eliminate stress concentration points and tiny gaps, effectively preventing salt spray erosion and weld corrosion failure in marine environments.
Precision Sizing & Stress Relief Straightening: Secondary precision calibration and professional stress relief treatment eliminate forming and welding residual stress, ensuring long-term structural stability of offshore auxiliary pipes.
100% NDT & Marine Grade Hydrostatic Testing: Each pipe undergoes full eddy current non-destructive flaw detection and enhanced high-pressure hydrostatic testing to eliminate micro defects and ensure zero leakage for offshore fluid delivery.
Accurate Fixed-Length Cutting: Support standard 6m/12m lengths and customized 1.5–18m fixed lengths, adapting to diversified layout and installation requirements of offshore platform auxiliary systems.
Professional Marine Anti-Corrosion Treatment: Optional heavy-duty hot-dip galvanizing and special marine anti-corrosion coating effectively resist seawater erosion, salt spray oxidation and high-humidity aging for long-term offshore exposure service.
Marine Working Condition Simulation Test: Conduct salt spray resistance, low-temperature toughness, cyclic pressure and fatigue tests to verify full compliance with offshore platform engineering acceptance standards.
Technical Specifications
Basic Parameters
Product Name: Offshore Platform Auxiliary HFW Alloy Carbon Straight Pipe Welding Process: HFW High-Frequency Induction Straight Welded Core Application: Offshore platform auxiliary pipeline, marine equipment support, offshore fluid circulation system Executive Standards: ASTM A53, ASTM A500, BS 1387, Marine Engineering Pipeline Standards Surface Options: Black finished, anti-rust oil coated, marine-grade anti-corrosion coated, hot-dip galvanized
Dimension Range
Outer Diameter: 76mm – 660mm (full specifications for offshore platform auxiliary tubular systems) Wall Thickness: 2.0mm – 25.4mm, thick-wall customized options for heavy-load offshore working conditions Length: Standard 6m/12m random length; customizable fixed length 1.5m–18m Tolerance: Marine engineering high-precision tolerance, suitable for precise assembly and long-term stable offshore operation
Mechanical & Marine Performance
Minimum Yield Strength: 290MPa Minimum Tensile Strength: 400MPa Elongation: ≥21% Core Performance: Excellent salt spray and seawater corrosion resistance, high low-temperature toughness, strong anti-fatigue and anti-vibration performance, stable pressure bearing capacity, no aging deformation or leakage under long-term offshore harsh environments
Product Advantages
Enhanced Marine Corrosion Resistance: Optimized alloy carbon steel formula and professional marine anti-corrosion treatment effectively resist salt spray, seawater erosion and high-humidity oxidation, solving the rapid aging problem of ordinary steel pipes in offshore environments.
Superior Structural Anti-Fatigue Performance: Compact pipe body and high-integrity welds resist long-term offshore wind vibration, wave impact and cyclic load, avoiding structural fatigue damage of platform auxiliary facilities.
Stable Low-Temperature Toughness: Excellent low-temperature mechanical properties prevent pipe embrittlement and cracking in offshore low-temperature and variable temperature environments, ensuring all-weather operational safety.
Reliable High-Pressure Sealing Performance: Defect-free HFW welding and strict marine-grade hydrostatic testing ensure zero leakage, suitable for long-term stable delivery of offshore circulating fluids and auxiliary media.
Strong Offshore Working Condition Adaptability: Adapt to exposed offshore installation, semi-buried laying and complex platform structural assembly, meeting diverse marine engineering layout demands.
Complete Specification Coverage: Full 76–660mm OD specification range covers all mainstream auxiliary pipeline and structural support pipe sizes for offshore platforms.
Low Long-Term Maintenance Cost: High-strength and anti-aging performance greatly reduces offshore pipeline inspection, repair and replacement frequency, lowering overall marine engineering operation costs.
Application Fields
Offshore oil and gas platform auxiliary fluid circulation pipelines
Offshore wind power platform equipment support and auxiliary structural pipes
Marine engineering offshore facility water supply and drainage pipeline systems
Deep-sea platform equipment matching auxiliary piping and connecting pipelines
Offshore platform anti-rust structural supports and facility fixing tubes
Coastal marine engineering heavy-duty anti-corrosion auxiliary pipeline projects
Offshore platform renovation, upgrading and new construction supporting pipe systems
Packaging & Delivery
All offshore platform alloy carbon auxiliary pipes adopt marine-grade heavy-duty export packaging. Pipes are bundled with high-strength anti-rust steel strips and fitted with thickened reinforced plastic end caps to protect pipe ends and inner walls from seawater and dust contamination. Enhanced waterproof, moisture-proof and salt-fog-proof packaging is applied for long-term marine transportation and offshore stock storage. Support FCL container loading and bulk marine shipment, with customizable marine engineering exclusive shipping marks and heavy-duty anti-corrosion packaging for large offshore project orders.
Quality Assurance & Service
We implement strict full-process ISO quality management system for marine-grade offshore platform steel pipes. Complete Mill Test Certificates, marine anti-corrosion performance test reports, low-temperature toughness test records and NDT inspection certificates are provided for each batch. Third-party inspections such as SGS and BV are acceptable. We support long-term bulk supply for marine engineering contractors and offshore facility manufacturers, providing one-stop professional services including marine standard parameter confirmation, production progress tracking, strict marine-grade quality inspection and full set of export clearance documents.
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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