ERW Welded Straight Pipe 76mm-660mm Low Pressure Fluid Conveyance Tube

Product Description

ERW Welded Straight Pipe 76mm-660mm Low Pressure Fluid Conveyance Tube is dedicated high-frequency straight seam welded carbon steel pipe designed for low-pressure fluid transmission systems, covering a complete outer diameter range of 76mm to 660mm. Manufactured strictly in compliance with GB/T3091, ASTM A53 Type E, EN10255 low-pressure fluid pipeline standards, this series pipe adopts low-carbon steel raw materials with stable mechanical performance, ideal for transporting tap water, natural gas, circulating water, sewage and other low-corrosion medium under working pressure below 1.6MPa.

We adopt mature HFW/ERW high-frequency resistance welding technology to achieve full metallurgical fusion between weld and pipe base metal. Online internal and external welding flash removal plus weld normalization stress relief heat treatment effectively eliminate welding residual stress, avoiding weld cracking under long-term low-pressure circulation load. All finished pipes undergo 100% full-length hydrostatic tightness test and full weld eddy current ultrasonic non-destructive inspection to eliminate pipeline leakage risks. Multiple surface anti-rust and anti-corrosion options are available, including black anti-rust oil, red fire epoxy paint, hot-dip galvanized, 3PE external anti-corrosion and food-grade internal epoxy lining. Custom fixed lengths, beveled, grooved and threaded pipe ends are supported to match overhead indoor installation and underground buried low-pressure fluid projects. With complete full-size specifications, stable pressure resistance and full inspection certification documents, this ERW straight pipe is the preferred bulk supply pipe for municipal water supply, gas distribution, factory circulating water and community low-pressure fluid transmission projects worldwide.

## 1. Basic Product Specifications - \\Product Name\\: ERW Welded Straight Pipe 76mm-660mm Low Pressure Fluid Conveyance Tube - \\Executive Standards\\: GB/T3091, ASTM A53 Type E, EN10255 Low Pressure Fluid Welded Pipe Standard - \\Outer Diameter Range\\: 76mm ~ 660mm full mainstream low-pressure fluid pipeline calibers - \\Wall Thickness Range\\: 2.0mm – 16mm, STD / SCH40 standard wall, customized thick wall for high-flow trunk lines - \\Applicable Steel Grades\\: Q195, Q235B, S235JR, ASTM A53 Grade B low-carbon fluid steel - \\Production Flow\\: Hot rolled coil slitting → multi-roll continuous forming → HFW high-frequency ERW welding → internal & external burr removal → weld normalization heat treatment → sizing & straightening → custom fixed-length cutting → full fluid pipeline standard inspection - \\Standard Stock Length\\: 6m / 9m / 12m - \\Custom Length Range\\: 0.5m ~ 12m, mixed multiple lengths acceptable in one batch order - \\Transmissible Medium\\: Tap water, domestic natural gas, factory circulating cooling water, rainwater, reclaimed water, low-concentration neutral industrial waste water - \\Design Working Pressure\\: 0.6MPa – 1.6MPa, thickened wall customized up to 2.0MPa for large-flow main pipelines - \\Service Scenarios\\: Indoor overhead fluid pipeline, underground buried municipal fluid trunk line, workshop low-pressure process pipeline - \\Optional Pipe End Processing\\: Plain flat ends, 30°~37.5° welding beveled ends, grooved clamp connection ends, NPT/BSP threaded ends, plastic anti-collision protective caps - \\Surface Treatment Options\\: Black anti-rust oil, red epoxy anti-rust paint, hot dip galvanized zinc coating, 3PE three-layer polyethylene anti-corrosion, food-grade internal epoxy lining - \\Core Features\\: Complete 76–660mm OD series, low-pressure fluid transmission special design, stress-relieved defect-free ERW weld, 100% hydrostatic tightness test, smooth inner wall to reduce flow resistance, diversified anti-corrosion customization, flexible length & pipe end processing, factory direct bulk supply for fluid engineering projects

## 2. Core Product Advantages ### 2.1 Full Complete 76–660mm Size Series, One-Stop Fluid Pipeline Procurement Covers all commonly used medium and large diameter specifications for municipal and industrial low-pressure fluid delivery, fully compatible with GB, ASTM, EN standard pipe fittings, elbows, tees and flanges. Engineering purchasers can complete all caliber centralized procurement from a single factory, simplify multi-supplier logistics coordination, reduce communication and transportation costs, and shorten the construction cycle of water, gas and circulating fluid pipeline renovation projects.

2.2 Low-Carbon Raw Material, Stable Low-Pressure Bearing Performance

Q195/Q235B/S235JR low-carbon steel features uniform internal texture, low impurity content, balanced plasticity and tensile strength. It can withstand long-term cyclic low-pressure fluid impact without brittle deformation or pipe burst, fully meeting the safety design requirements of urban residential gas and water supply networks. The material has excellent cutting, welding and threading performance, convenient for on-site pipeline connection and reconstruction.

2.3 Optimized HFW Weld & Stress Relief Treatment, Zero Leakage Risk

Flux-free high-frequency concentrated edge heating creates a narrow heat-affected zone without coarse grain embrittlement. Online weld normalization heat treatment eliminates residual stress generated during welding, effectively preventing weld cracking caused by pipeline vibration and soil extrusion after buried installation. 100% full-length hydrostatic pressure holding test and full weld non-destructive scanning inspection thoroughly eliminate medium leakage hidden dangers, avoiding resource waste and safety hazards caused by pipe leakage.

2.4 Smooth Inner Wall, Lower Fluid Transmission Energy Consumption

Online mechanical full removal of internal welding flash forms flat smooth inner pipe surface, greatly reducing friction resistance of water and gas medium. It inhibits sediment, rust and mineral scaling adhesion inside the pipeline, reduces regular pipeline cleaning frequency, and lowers the long-term power consumption of water pumps and gas booster equipment, complying with energy-saving design standards for municipal and industrial fluid systems.

2.5 Multi-Scene Anti-Corrosion Customization For Different Laying Conditions

Black anti-rust oil: Low-cost option for short-term indoor overhead temporary fluid pipelines

Red epoxy paint: Standard indoor factory circulating water pipeline, clear identification and strong anti-rust adhesion

Hot dip galvanized coating: For open-air overhead gas and water pipelines, long-term atmospheric anti-corrosion service life up to 15 years

3PE composite anti-corrosion: Dedicated for underground buried fluid pipelines, resisting soil electrochemical corrosion and mechanical scratch

Food-grade internal epoxy lining: Special for drinking water delivery pipelines, non-toxic and harmless, preventing inner wall rust and scaling

2.6 Flexible Integrated Customization, Complete Engineering Acceptance Documents

Support one-stop customization of length, wall thickness, pipe end processing and anti-corrosion coating according to project drawings, no need for secondary outsourcing processing on site to save construction labor cost. All batches are equipped with complete official Mill Test Report, hydrostatic test certificate and weld inspection report, supporting SGS, BV third-party sampling inspection required by municipal and industrial bidding projects, with full batch raw material traceability system to smoothly pass project acceptance.

## 3. Dimensional Tolerance Standard (GB/T3091 & EN10255) | Inspection Item | Standard Tolerance | | ---- | ---- | | Outer Diameter (76mm–168mm) | ±0.8% nominal OD | | Outer Diameter (168mm–660mm) | ±1.0% nominal OD | | Wall Thickness | +12% / −10% nominal thickness | | Pipe Straightness | ≤1.5mm per meter | | Out-of-Roundness | ≤1.0% of outer diameter | | Custom Cutting Length | +50mm / 0mm, higher precision than standard fixed-length pipes |

## 4. Mechanical & Chemical Properties For Low Pressure Fluid Pipe ### 4.1 Mechanical Properties | Steel Grade | Min. Yield Strength | Tensile Strength | Min. Elongation | Mandatory Factory Test | | ---- | ---- | ---- | ---- | ---- | | Q195 | ≥195MPa | 315–430MPa | ≥27% | Flattening test, 180° cold bending test, weld NDT inspection | | Q235B / S235JR | ≥235MPa | 360–510MPa | ≥26% | 100% hydrostatic tightness test, full weld UT/ET scanning, cold bending test | | ASTM A53 Grade B | ≥240MPa | ≥415MPa | ≥20% | Hydrostatic pressure test, reverse bend test, full weld inspection |

4.2 Maximum Allowable Chemical Composition (Mass %)

Note: All pipes pass flattening and cold bending test without weld cracks; food safety lining inspection reports can be provided separately for drinking water pipeline projects.

## 5. Complete Manufacturing & Processing Flow 1. \\Raw Material Inspection\\: Test chemical composition and mechanical performance of hot rolled low-carbon steel coils, screen qualified raw materials meeting low-pressure fluid pipeline standards. 2. \\Slitting & Edge Finishing\\: Precision slitting according to required wall thickness, polish strip edge oxide scale to ensure stable uniform welding gap. 3. \\Multi-Roll Continuous Precision Forming\\: Gradual rolling molding to guarantee uniform roundness and consistent wall thickness of pipe blank. 4. \\HFW High-Frequency ERW Welding\\: Closed-loop automatic parameter control to realize full penetration solid-state metallurgical weld without filler metal. 5. \\Internal & External Weld Burr Removal\\: Online mechanical scarving to clear welding flash for smooth inner pipe wall and low fluid flow resistance. 6. \\Weld Normalization Stress Relief Heat Treatment\\: Eliminate welding residual stress, improve weld anti-cracking performance under long-term low-pressure circulation load. 7. \\Sizing & Straightening\\: Precision sizing mill calibrate outer diameter to standard tolerance range, straightener correct pipe linearity. 8. \\Numerical Control Custom Fixed-Length Cutting\\: Automatic cutting according to customer customized length, neat burr-free cut ends, support mixed multiple length production in one batch. 9. \\Low-Pressure Fluid Standard Full Inspection\\: 100% hydrostatic tightness test, full weld non-destructive flaw detection and full dimensional reinspection. 10. \\Custom Pipe End & Anti-Corrosion Processing\\: Grooving, threading, beveling and anti-rust/anti-corrosion coating construction as per project laying environment demands. 11. \\Laser Permanent Marking\\: Mark execution standard, steel grade, OD×WT, actual length, batch number and surface treatment type on each pipe body. 12. \\Export Standard Protective Packaging\\: Waterproof wear-resistant PE film wrapping, high-strength steel strip bundling, plastic anti-collision end caps to avoid coating scratch and pipe collision damage during long-distance transportation.

## 6. Main Application Scope - Municipal Low-Pressure Fluid Engineering: Urban tap water distribution pipeline, residential natural gas branch network, urban rainwater and reclaimed water delivery pipeline - Factory Industrial Circulation System: Workshop cooling circulating water pipeline, low-pressure neutral process gas delivery pipeline - Community Supporting Facilities: Residential complex underground water supply trunk line, park greening irrigation pipeline - Agricultural Water Supply Project: Rural centralized domestic water pipeline, farmland irrigation auxiliary pipeline - Global Low-Pressure Fluid EPC Projects: Overseas municipal, industrial and agricultural fluid transmission pipeline projects complying with GB, ASTM, EN international standards

## 7. Quality Inspection & Factory Qualification Certification - Fully compliant with GB/T3091, ASTM A53 Type E, EN10255 low-pressure fluid welded pipe international standards - ISO 9001 quality management system certified full HFW production line, dedicated fluid pipeline processing workshop - Dual independent inspection links: Base pipe hydrostatic & full weld NDT inspection + finished anti-corrosion coating thickness and adhesion inspection - Complete set of official MTR material reports, weld inspection certificates and hydrostatic test records provided with each shipment - Support SGS, BV third-party on-site sampling inspection required by municipal and industrial bidding projects - Full batch traceability system covering steel coil raw material to finished fluid pipe delivery to construction sites

## 8. Packaging & Bulk Delivery Arrangement - \\Packaging\\: Bare black pipes coated with anti-rust oil wrapped with thick waterproof PE film; galvanized/3PE/epoxy lined anti-corrosion pipes with double-layer wear-resistant protective film, bundled with high-strength steel strips, plastic anti-collision caps installed at both pipe ends. - \\Product Marking\\: Laser permanent marking including execution standard, steel grade, outer diameter × wall thickness, custom length, batch number and surface anti-corrosion type. - \\Trade Terms\\: FOB, CIF, CFR, DAP global sea and land bulk delivery, support inland truck transport to municipal and factory construction sites - \\Main Shipping Ports\\: Tianjin, Qingdao, Shanghai, Ningbo, support full container mixed-length bulk loading for large fluid pipeline project orders - \\Customization Service\\: Arbitrary fixed length 0.5–12m, mixed multiple lengths per order, adjustable wall thickness, multi-type anti-corrosion coating and special pipe end processing - \\Delivery Cycle\\: Conventional stock fluid pipe specifications 3–7 working days; customized anti-corrosion + special pipe end processing pipes 10–16 working days

## 9. Why Choose Our ERW Straight Pipe For Low Pressure Fluid Conveyance 1. Professional low-pressure fluid dedicated ERW pipe production line, full 76–660mm OD complete size series to match all municipal and industrial fluid transmission specifications 2. Multiple low-carbon steel grade options, balanced cost and pressure-bearing performance, fully adapt to indoor overhead and underground buried two laying modes 3. Weld normalization heat treatment + 100% hydrostatic tightness test, effectively eliminate pipeline medium leakage hidden danger for long-term fluid transportation 4. Diversified graded anti-corrosion solutions, matching indoor, open-air, underground buried and drinking water different medium service environments 5. Flexible one-stop customization of length, wall thickness and pipe ends, reduce customer on-site secondary processing cost and construction period 6. Factory direct bulk supply without intermediate markup, stable mass production capacity and complete bidding acceptance documents, long-term stable supplier for global fluid engineering EPC contractors

## Contact Us For factory wholesale quotations, detailed low-pressure fluid pipeline technical data sheets, anti-corrosion coating inspection certificates, bulk project order discounts and mass delivery schedules of \\ERW Welded Straight Pipe 76mm-660mm Low Pressure Fluid Conveyance Tube\\, please contact our professional global fluid pipeline sales team. As a reliable ERW straight welded pipe manufacturer, we supply full OD range low-pressure fluid conveyance steel pipes and one-stop customized anti-corrosion processing solutions for global municipal water/gas, factory circulating water and agricultural water supply bulk procurement projects.

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