HFW Carbon Steel Pipe OD76-660mm Fire Fighting Pipeline Welded Tube

Product Description

HFW Carbon Steel Pipe OD76-660mm Fire Fighting Pipeline Welded Tube is special high-frequency straight seam welded carbon steel pipe dedicated to building fire protection systems, covering full outer diameter range of 76mm to 660mm. It is strictly manufactured in accordance with GB/T3091, ASTM A53, ASTM A795, EN10255 fire-fighting fluid pipeline standards, mainly adopting Q235B, ASTM A53 Grade B low-carbon pressure-resistant steel, suitable for indoor fire sprinkler systems, fire hydrant main pipelines, underground buried fire water pipes, industrial factory fire protection trunk lines, high-rise building fire standpipes and other fire engineering projects.

Adopting mature HFW high-frequency induction solid-state welding process, the weld realizes complete metallurgical fusion with pipe base metal, equipped with online internal & external flash removal and weld normalization stress relief heat treatment to eliminate welding residual stress. All finished pipes pass 100% full-length hydrostatic pressure test (test pressure 1.5 times the design working pressure) and full weld ultrasonic/eddy current non-destructive inspection, effectively preventing pipeline burst and water leakage risks under long-term fire water pressure circulation.

We provide multiple fire-specific surface treatment options: fire-resistant red epoxy paint, hot-dip galvanized, internal anti-rust lining, 3PE buried anti-corrosion coating, matching indoor overhead, underground buried, coastal humid and factory corrosive environments. With complete full-size specifications, stable pressure-bearing performance, standardized groove/thread pipe end processing and complete fire engineering acceptance documents, this HFW fire fighting welded tube is the mainstream supporting pipeline for global commercial buildings, residential communities, industrial plants and municipal fire protection EPC projects.

## 1. Basic Product Specifications - \\Product Name\\: HFW Carbon Steel Pipe OD76-660mm Fire Fighting Pipeline Welded Tube - \\Executive Standards\\: GB/T3091, ASTM A53 Type E, ASTM A795 fire pipe standard, EN10255, NFPA 13 fire sprinkler system specification - \\Outer Diameter Range\\: 76mm ~ 660mm full fire protection main pipe mainstream calibers - \\Conventional Wall Thickness\\: 3.0mm – 18mm; STD, SCH40 standard wall + custom thickened wall for high-rise high-pressure fire standpipes - \\Steel Grades\\: Q235B, ASTM A53 Grade B low-carbon pressure fluid steel - \\Production Process\\: Hot rolled coil slitting → multi-roll precision forming → HFW high-frequency ERW welding → internal & external burr removal → weld normalization heat treatment → sizing & straightening → fixed-length cutting → full hydrostatic & NDT fire standard inspection - \\Standard Length\\: 6m / 9m / 12m; custom fixed length within 12m supported - \\Applicable Medium\\: Fire sprinkler water, fire hydrant water, fire reserve pool circulating water, low-corrosion fire suppression water - \\Design Working Pressure\\: 0.6–1.6MPa, thickened wall customized up to 2.5MPa for super high-rise fire vertical pipes - \\Service Environment\\: Indoor overhead fire pipeline, underground buried fire trunk line, coastal salt fog factory, chemical workshop humid corrosive area - \\Pipe End Custom Processing (Fire Special)\\: 1. Grooved ends for clamp connection (most widely used for fire engineering) 2. 30°~37.5° beveled welding ends 3. NPT/BSP threaded ends for small branch pipes 4. Plain flat ends + plastic anti-collision protective caps - \\Fire Dedicated Surface Anti-Corrosion Options\\: 1. Red fire epoxy paint (indoor overhead fire pipeline standard) 2. Hot-dip galvanized zinc coating (zinc weight 180–320g/㎡) 3. 3PE three-layer anti-corrosion (underground buried fire main pipe) 4. Internal anti-rust epoxy lining (prevent inner wall scaling and rust blockage) - \\Core Features\\: Full 76–660mm OD series, fire protection dedicated pressure-resistant HFW weld, 100% hydrostatic tightness test, multiple fire matching anti-corrosion coatings, customizable groove/thread pipe ends, stable burst resistance, complete fire engineering inspection documents, factory bulk supply for fire protection EPC projects

## 2. Core Product Advantages ### 2.1 Complete 76–660mm Full Caliber Series, One-Stop Fire Engineering Centralized Procurement Covers all medium and large diameter specifications required for fire sprinkler main pipes, hydrant trunk lines and buried fire pipelines, fully compatible with GB/ASTM standard fire pipe grooved clamps, elbows, tees and flanges. Fire engineering contractors can complete all caliber centralized procurement from a single factory, simplify multi-supplier logistics coordination, shorten project construction cycle and reduce overall supporting costs, suitable for large shopping malls, industrial parks and residential community fire protection batch construction projects.

2.2 Fire-Specific Low-Carbon Steel, Excellent Long-Term Pressure Resistance

Q235B / ASTM A53 Grade B steel strictly controls sulfur and phosphorus impurities, uniform fine grain internal structure, balanced tensile strength and plasticity. It can withstand long-term alternating water pressure circulation of fire water supply systems, no brittle fracture or pipe burst under instantaneous pressure impact during fire water pump startup. Thickened wall customization is available for super high-rise vertical fire pipes to meet high static pressure safety design requirements.

2.3 HFW Weld + Weld Normalization Heat Treatment, Zero Leakage Hidden Danger

Flux-free high-frequency concentrated edge heating forms narrow heat-affected zone without coarse grain embrittlement. Independent online normalization heat treatment eliminates concentrated residual stress easily generated by thick wall fire pipes, effectively avoiding weld cracking under long-term water pressure and pipeline vibration. 100% full-length hydrostatic pressure holding test and full weld ultrasonic scanning NDT completely eliminate fire pipeline water leakage risks, ensuring reliable operation of fire protection life-saving systems.

2.4 Fire Multi-Scene Anti-Corrosion Customization, Long Service Life

Red epoxy fire paint: Bright red fire identification color, strong adhesion, low cost for indoor overhead sprinkler and hydrant pipelines

Hot-dip galvanized layer: Isolate atmospheric moisture, suitable for factory open-air and coastal humid fire pipelines, anti-rust life up to 15–20 years

3PE composite anti-corrosion: For underground buried fire main pipes, resist soil extrusion and electrochemical corrosion, service life over 40 years

Internal epoxy lining: Prevent inner wall rust and mineral scaling, avoid pipeline blockage affecting fire water supply flow

2.5 Smooth Inner Wall, Stable Fire Water Supply Flow

Online mechanical full removal of internal welding flash forms flat smooth inner surface, reducing water flow friction loss. It avoids sediment and rust accumulation inside pipes, guarantees stable water output pressure of sprinklers and fire hydrants during fire emergencies, conforming to NFPA and domestic fire protection pipeline flow design standards.

2.6 Fire Standard Strict Inspection, Complete Engineering Acceptance Documents

All pipes adopt enhanced fire protection special inspection standards: hydrostatic test pressure 1.5 times design working pressure, full weld non-destructive scanning, 180° cold bending test without crack. We can provide complete MTR material report, weld inspection certificate, hydrostatic test record and anti-corrosion coating test report. Support SGS, BV third-party on-site sampling inspection required by fire bidding projects, full batch raw material traceability system to smoothly pass fire engineering government acceptance.

## 3. Dimensional Tolerance Standard (GB/T3091 & ASTM A795 Fire Pipe Standard) | 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; tighter tolerance for high-pressure fire thick wall pipes | | Pipe Straightness | ≤1.5mm per meter | | Out-of-Roundness | ≤1.0% of outer diameter | | Cutting Length | +100mm / −0mm |

## 4. Mechanical & Chemical Properties (Fire Protection Low Carbon Steel) ### 4.1 Mechanical Properties | Steel Grade | Min. Yield Strength | Tensile Strength | Min. Elongation | Mandatory Factory Fire Test | | ---- | ---- | ---- | ---- | ---- | | Q235B | ≥235MPa | 370–500MPa | ≥26% | 100% hydrostatic tightness test (1.5× working pressure), full weld UT/ET NDT, 180° cold bending test | | ASTM A53 Grade B | ≥240MPa | ≥415MPa | ≥20% | Hydrostatic pressure test, reverse bend test, full weld scanning inspection |

4.2 Maximum Allowable Chemical Composition (Mass %)

Note: All pipes pass flattening and cold bending test without weld crack; fire red paint / galvanized coating third-party inspection reports can be provided separately for fire engineering bidding.

## 5. Complete HFW Manufacturing & Fire Anti-Corrosion Process 1. \\Raw Material Inspection\\: Inspect chemical composition and tensile performance of certified hot rolled low carbon steel coils, eliminate raw materials with high impurity content unfit for pressure fire pipelines. 2. \\Slitting & Edge Levelling\\: Precision slitting to matched width, grind strip edge oxide scale to guarantee uniform stable welding gap for leak-free fire pipe weld. 3. \\Multi-Roll Continuous Precision Forming\\: Gradual rolling molding to ensure uniform roundness and consistent wall thickness of pipe blank, meet fire pipeline dimensional tolerance limits. 4. \\HFW High-Frequency Induction Welding\\: Closed-loop automatic parameter control, concentrated edge heating 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, stable fire water flow transmission. 6. \\Weld Normalization Stress Relief Heat Treatment\\: Eliminate welding residual stress, improve weld anti-cracking performance under long-term water pressure and pipeline vibration. 7. \\Sizing & Straightening\\: Precision sizing mill calibrate outer diameter to standard tolerance, straightener correct pipe linearity. 8. \\Custom Fire Pipe End Processing\\: Grooving, threading, beveling or flat cutting according to engineering connection requirements. 9. \\Fire Standard Full Inspection\\: 100% hydrostatic tightness test, full weld ultrasonic non-destructive flaw detection, full dimensional reinspection. 10. \\Fire Dedicated Anti-Corrosion Construction\\: Red epoxy painting / hot-dip galvanizing / 3PE buried anti-corrosion / internal lining processing as per project design. 11. \\Finished Coating Inspection\\: Detect coating thickness, adhesion and uniformity to meet fire pipeline anti-corrosion standards. 12. \\Laser Permanent Marking\\: Mark execution standard, steel grade, OD×WT, batch number and anti-corrosion type on each pipe body. 13. \\Fire Engineering Export Packaging\\: Thick wear-resistant PE film wrapping to avoid scratch of red paint/galvanized layer, bundled with high-strength steel strips, thick plastic anti-collision end caps to protect grooved pipe ends during transportation and construction.

## 6. Main Fire Fighting Pipeline Application Scope - Commercial Building Fire Protection: Shopping mall, office building, hotel indoor sprinkler system, fire hydrant horizontal and vertical main pipes - Residential Community Fire Engineering: High-rise residential fire standpipe, underground buried fire water supply trunk line - Industrial Factory Fire Pipeline: Manufacturing workshop, warehouse fire protection pipeline, chemical plant anti-corrosion fire water pipe - Municipal Public Fire Facilities: Underground urban fire reserve water transmission pipeline, park public fire hydrant supporting pipeline - Global Fire EPC Projects: Overseas commercial, industrial and municipal fire protection pipeline projects complying with GB, ASTM, EN international fire pipe standards

## 7. Quality Inspection & Fire Engineering Qualification Certification - Fully compliant with GB/T3091, ASTM A53, ASTM A795, EN10255 fire fighting welded pipeline international standards, matching NFPA 13 fire sprinkler design requirements - ISO 9001 quality management system certified full HFW production line, dedicated fire pipe anti-corrosion processing workshop - Dual independent inspection system: base pipe hydrostatic & full weld NDT inspection + finished fire anti-corrosion coating performance inspection - Complete set of fire bidding official MTR test documents, weld inspection certificates and anti-corrosion test reports supplied per shipment - Support SGS, BV third-party on-site sampling inspection required by government fire engineering bidding projects - Full batch traceability system covering steel coil raw material to finished fire pipe delivery to construction sites

## 8. Packaging & Fire Engineering Bulk Delivery Arrangement - \\Packaging\\: Red painted / galvanized fire pipes wrapped with double-layer wear-resistant PE protective film to prevent coating scratch during transportation and on-site grooving construction, bundled with high-strength steel strips, thick plastic anti-collision caps installed at both pipe ends. - \\Product Marking\\: Laser permanent marking including execution standard, steel grade, outer diameter × wall thickness, batch number and fire anti-corrosion type. - \\Trade Terms\\: FOB, CIF, CFR, DAP global sea and land bulk delivery, support inland truck transport to city fire engineering construction sites - \\Shipping Ports\\: Tianjin, Qingdao, Shanghai, Ningbo, support full container centralized loading for large fire protection project bulk orders - \\Customization Service\\: Custom fixed length, thickened wall for high-pressure fire standpipes, multi-type fire anti-corrosion coating, grooved/threaded/beveled special pipe end processing - \\Delivery Cycle\\: Conventional stock fire pipe specifications 7–12 working days; customized thick wall + heavy anti-corrosion + grooved finished pipes 12–18 working days

## 9. Why Choose Our HFW Fire Fighting Carbon Steel Pipe 1. Professional fire protection dedicated HFW pipe production line, supporting grooving, threading and other fire special pipe end integrated processing 2. Complete 76–660mm outer diameter full series, one-stop bulk supply for sprinkler, hydrant and buried all fire pipeline specifications 3. Fire pressure-resistant low-carbon steel + weld normalization treatment, eliminate long-term water pressure weld cracking and pipeline burst hidden danger 4. Multiple fire identification anti-corrosion coatings (red paint/galvanized/3PE), adapt to indoor overhead, underground buried, coastal and factory corrosive environments 5. Strict fire enhanced hydrostatic test and full weld NDT inspection, all test documents meet domestic and overseas fire engineering bidding acceptance standards 6. Factory direct bulk supply without intermediate markup, sufficient spot inventory and stable mass delivery capacity, long-term stable supplier for global fire protection EPC contractors

## Contact Us For factory bulk wholesale quotations, detailed GB/ASTM fire pipe technical data sheets, anti-corrosion coating inspection certificates, large fire engineering order discounts and mass delivery schedules of \\HFW Carbon Steel Pipe OD76-660mm Fire Fighting Pipeline Welded Tube\\, please contact our professional fire protection engineering sales team. We supply full OD range HFW welded fire protection carbon steel pipes and one-stop fire anti-corrosion customized solutions for global commercial, industrial, residential and municipal fire fighting pipeline bulk procurement projects.

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