Hebei Huayang Steel Pipe Co., Ltd is one of the most experienced manufacturers and suppliers of erw high frequency straight tube 76~660mm shipyard auxiliary pipeline pipe in China. Welcome to buy discount erw high frequency straight tube 76~660mm shipyard auxiliary pipeline pipe made in China here from our factory. Quality products and low price are available.
Product introduction
1. Product Overview
76~660mm ERW High Frequency Straight Tube for Shipyard Auxiliary Pipeline is a professional marine-grade welded steel pipe independently developed for shipbuilding, ship repair and offshore platform auxiliary piping systems. Different from ordinary civil industrial pipes, this high-frequency straight seam ERW pipe adopts marine-standard hot-rolled steel raw materials and specialized welding & fine finishing technology, targeted to adapt to ship hull vibration, marine humid salt-spray environment and complex onboard pipeline layout conditions.
Covering a full outer diameter range from 76mm to 660mm, with standardized customized wall thickness and fixed-length specifications, the product strictly complies with ship piping classification standards and marine engineering specifications. It features stable structural rigidity, excellent vibration resistance, salt spray corrosion resistance and high welding compliance. Widely used for various low and medium-pressure auxiliary pipeline systems in shipyards, cargo ships, passenger ships, engineering vessels and offshore facilities, it is the cost-effective preferred pipe material for shipbuilding auxiliary piping projects.
Core Shipyard & Marine Application Scenarios
Ship cabin domestic water supply & sewage discharge auxiliary pipelines
Onboard low-pressure compressed air, gas and ventilation supporting pipelines
Shipyard workshop temporary water, gas and power matching piping systems
Vessel cooling water circulation & heat exchange auxiliary pipelines
Offshore platform low-pressure fluid transmission auxiliary pipe network
Ship repair and refitting supporting pipeline engineering
Marine fire prevention auxiliary water delivery & drainage pipelines
Ship hull auxiliary cable protection & matching piping
2. Production Technology & Marine-Grade Craft Advantages
This shipyard dedicated ERW high-frequency straight tube adopts strict marine pipeline production process, optimized for ship vibration, salt spray and long-term marine environmental working conditions, solving common problems of ordinary pipes such as weld looseness, rusting and vibration deformation onboard:
Marine-grade hot rolled steel coil raw material inspection (strict control of impurity elements to ensure marine environmental adaptability)
Precision continuous rolling forming to guarantee uniform pipe roundness and wall thickness for ship piping assembly
High-frequency longitudinal resistance straight seam welding, full fusion weld without gap or trachoma
Online weld normalizing heat treatment to eliminate welding residual stress, enhance anti-vibration fatigue performance
Full-length online ultrasonic non-destructive testing for 100% weld quality assurance
Pipe end precision cutting, deburring and beveling treatment for ship standard welding installation
Marine standard hydrostatic pressure test and vibration fatigue simulation test
Special marine anti-rust treatment & export waterproof and collision-proof packaging
Unique Advantages for Shipyard Auxiliary Pipeline System
Excellent Marine Vibration Resistance: Weld stress relief process and integrated pipe body structure effectively resist hull sailing vibration and wave impact fatigue, no weld cracking or pipe loosening during long-term ship operation.
Salt Spray & Humidity Corrosion Resistance: Optimized steel formula and surface anti-corrosion treatment adapt to coastal shipyard and marine high-salt, high-humidity environment, effectively delaying surface oxidation and rust.
High Assembly Compatibility for Ship Piping: Ultra-precise dimensional tolerance, standard straight seam weld and flat pipe body perfectly match marine pipe fittings, flanges and valves, convenient for onboard close-range layout and bending installation.
Stable Low-Medium Pressure Bearing Capacity: Designed for ship auxiliary pipeline working pressure, stable pressure resistance without seepage, fully meeting onboard water, gas and circulating fluid transmission safety standards.
Lightweight & Space-Saving Layout: Uniform pipe body structure with reasonable wall thickness design, lightweight and easy to arrange in narrow ship cabin space, suitable for complex marine pipeline layout.
Superior Cost Performance: Compared with marine seamless pipes, ERW high-frequency straight tubes have lower engineering cost, stable batch quality and faster delivery, ideal for large-scale shipyard auxiliary pipeline matching projects.
3. Complete Technical Specification Parameters
|
Item |
Professional Marine Parameters |
|
Outer Diameter Range |
76mm – 660mm (NPS3 ~ NPS24) |
|
Wall Thickness Range |
2.5mm – 18mm (custom SCH40/SCH80/STD marine standard wall thickness) |
|
Standard Length |
6m, 12m (marine engineering standard); customizable fixed cutting length |
|
Applicable Standards |
GB/T 3091, GB/T 5312, ASTM A53, EN 10217, DIN 86004, ISO 3183 (Shipyard Auxiliary Pipeline Standards) |
|
Steel Grades |
Q235B, S235JR, ASTM A53 Gr.B, X42 (Marine Auxiliary Pipe Dedicated Grades) |
|
Applicable Medium |
Ship domestic water, cooling circulating water, compressed air, low-pressure gas, drainage medium |
|
Max Working Pressure |
≤2.0MPa (Meet Ship Class III Auxiliary Pipeline Standard) |
|
Working Environment |
Marine salt spray, high humidity, ship vibration, coastal low temperature |
|
Pipe End Treatment |
Beveled ends (marine welding), plain ends, grooved ends, threaded ends (small diameter) |
|
Surface Treatment |
Marine anti-rust oil, salt-spray resistant primer, 3PE/FBE anti-corrosion (outdoor & hull buried piping) |
|
Size Tolerance |
OD ±0.75%, Wall thickness ±8%, Length ±50mm (strict marine tolerance standard) |
4. Core Marine-Grade Performance
4.1 High-Strength Weld Seam & Anti-Vibration Fatigue
Adopts high-frequency precise straight seam welding + online stress relief heat treatment, weld strength equivalent to base metal. Eliminates welding brittle zone, effectively resists long-term periodic vibration and impact during ship navigation, avoiding weld cracking and pipeline failure, adapting to unique ship working conditions.
4.2 Excellent Salt Spray & Marine Environmental Resistance
Strictly controlled low-impurity steel composition cooperates with professional marine anti-corrosion coating, with strong resistance to coastal salt spray erosion, high humidity oxidation and atmospheric corrosion. It can maintain stable performance in long-term shipyard and marine environments, greatly reducing pipeline maintenance frequency.
4.3 Smooth Inner Wall & Stable Fluid Transmission
Precision forming and inner weld bead leveling treatment ensure smooth pipe inner wall, no burrs or protrusions. Effectively reduces fluid transmission resistance, avoids sediment and marine biological attachment, ensures unobstructed ship water and gas pipeline circulation, and guarantees stable operation of ship auxiliary systems.
4.4 Reliable Structural Stability & Deformation Resistance
Uniform pipe body grain structure and high overall rigidity ensure no deformation or collapse under external pressure and cabin load. It adapts to narrow and complex ship cabin installation space, meets marine pipeline layout and load-bearing requirements, and has strong structural stability.
4.5 Good Marine Construction Adaptability
Standard pipe body size and excellent machinability support on-site cutting, bending, grooving and welding of shipyards. Compatible with all conventional marine pipe fittings and valves, it greatly improves the efficiency of shipbuilding and ship repair pipeline construction and installation.
5. Strict Ship-Grade Inspection & Testing System
In view of the high safety and environmental adaptability requirements of ship auxiliary pipelines, all products undergo full marine standard inspection before delivery to meet shipyard and marine engineering acceptance norms:
Marine steel raw material chemical composition & mechanical performance certification test
Pipe body tensile, yield strength and elongation mechanical performance detection
Weld flattening, bending and vibration fatigue resistance test
100% full-length ultrasonic weld non-destructive flaw detection
Marine standard hydrostatic pressure leakage simulation test
Salt spray corrosion resistance sampling test for marine environment
Full dimensional tolerance & surface quality inspection
SGS/BV/TUV third-party marine industry witnessing inspection (customizable)
6. Export Packaging & Marine Logistics Solution
Small & Medium Diameter (76-219mm): Standard hexagonal steel belt bundling, thickened plastic end caps for anti-collision protection, waterproof and moisture-proof kraft paper wrapping, suitable for long-distance sea transportation and ship storage.
Large Diameter (273-660mm): Single pipe independent protection, container bulk loading, soft spacer separation to prevent pipe body and weld damage during maritime transportation and handling.
Marine Professional Marking: Each bundle is printed with marine standard, specification, steel grade, batch number and inspection information, supporting shipyard project acceptance, customs clearance and ship classification inspection.
Global Marine Logistics: Support sea freight, port transportation and land logistics, stable supply for shipbuilding and marine auxiliary pipeline projects in Southeast Asia, Middle East, Europe and global shipyards.
7. Authoritative Qualification Certifications
ISO 9001 Quality Management System Certification
ISO 14001 Environmental Management System Certification
CE Marine Pressure Equipment Certification
GB/T 5312 Marine Steel Pipe Production Qualification
DIN 86004 Marine Anti-Corrosion Standard Compliance
SGS / BV / TUV Marine Third-Party Inspection Reports
Complete export customs clearance and marine engineering inspection 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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