Name: China Galvanized ERW Straight Seam Pipe 76-660mm Zinc Coated Factory Supply Manufacturers Suppliers Factory - Huayang Steel Pipe
Brand: Huayang
SKU: 305366579

Hebei Huayang Steel Pipe Co., Ltd is one of the most experienced manufacturers and suppliers of galvanized erw straight seam pipe 76-660mm zinc coated factory supply in China. Welcome to buy discount galvanized erw straight seam pipe 76-660mm zinc coated factory supply made in China here from our factory. Quality products and low price are available.

Product introduction

Product Description

Galvanized ERW Straight Seam Pipe 76-660mm Zinc Coated Factory Supply is integrated hot-dip zinc coated high-frequency straight seam welded steel pipe, produced with independent ERW welding production line and automatic hot-dip galvanizing workshop, covering full outer diameter range of 76mm to 660mm. Base pipe adopts HFW solid-state induction welding technology, and overall hot-dip galvanizing treatment complies with ISO 1461, EN10240, GB/T13912, ASTM A53 international coating standards, forming compact alloy zinc layer on both inner and outer surfaces to achieve long-term anti-rust and anti-corrosion protection.

Base raw materials adopt Q235B, S235JR, ASTM A53 Grade B low carbon steel, applicable to municipal water & gas delivery, agricultural greenhouse frames, construction scaffolding, road guardrails and all kinds of outdoor pipeline projects. All bare pipes complete 100% hydrostatic tightness test and full weld non-destructive inspection before galvanizing; standardized full-process hot-dip galvanizing ensures adjustable zinc coating weight of 80–350g/㎡, tight metallurgical bonding without peeling, bubbling or exposed iron after bending, cutting and field installation. We support customized fixed-length cutting, threaded, grooved and beveled pipe end processing. As an integrated factory with full production capacity, we provide direct bulk supply without intermediate links, sufficient spot inventory and competitive ex-factory price, being a stable long-term zinc coated pipe supplier for global municipal, agricultural and construction engineering purchasers.

1. Basic Product Specifications

Product Name: Galvanized ERW Straight Seam Pipe 76-660mm Zinc Coated Factory Supply

Executive Standards: Base pipe: GB/T3091, ASTM A53 Type E, EN10219; Galvanizing standard: ISO1461, EN10240, GB/T13912

Outer Diameter Range: 76mm ~ 660mm full standard galvanized pipe calibers

Conventional Wall Thickness: 2.0mm – 20mm, STD / SCH40 / SCH80 customized wall thickness available

Steel Grades: Q235B, S235JR, ASTM A53 Grade B low carbon structural steel

Complete Production Flow: Hot rolled coil slitting → multi-roll forming → HFW ERW welding → internal & external burr removal → weld stress relief heat treatment → sizing & fixed-length cutting → pickling & flux activation → hot-dip zinc dipping → air wiping → cooling passivation → finished product inspection

Adjustable Zinc Coating Weight: 80–350g/㎡ customized according to project environment requirements

Standard Length: 6m / 9m / 12m; custom fixed length within 12m supported

Applicable Scenarios: Municipal water & gas transmission pipeline, agricultural greenhouse skeleton, building exterior scaffolding, road safety guardrail, outdoor fire protection pipeline, mechanical equipment support frame

Service Environment: Medium-low pressure fluid transportation, outdoor rainy, high humidity, coastal salt fog and saline soil corrosive conditions

Pipe End Options: Plain flat ends, 30°~37.5° beveled welding ends, threaded ends, grooved ends, plastic anti-collision end caps

Core Features: Full 76–660mm complete caliber series, double-sided uniform zinc coating, high-adhesion anti-corrosion layer, defect-free ERW welding seam, anti-rust service life up to 15–20 years, integrated factory one-stop production, flexible customized processing, factory direct bulk wholesale

2. Core Product Advantages

2.1 Complete 76–660mm Full Size Series, One-Stop Factory Centralized Sourcing

Covers all mainstream medium and large diameter galvanized pipe specifications for fluid transportation and structural engineering, perfectly matched with GB, ASTM, EN standard galvanized pipe elbows, tees, flanges and scaffolding couplers. Customers can complete all caliber procurement from a single factory, simplify purchasing management procedures, cut multi-supplier logistics and communication costs, and shorten the preparation cycle of large-scale bulk engineering projects.

2.2 Integrated ERW Welding + Standard Hot-Dip Galvanizing Dual Quality Control

The base pipe adopts flux-free HFW high-frequency induction welding, the welding seam achieves full metallurgical fusion with the base metal without pores, slag inclusions or microcracks; online weld stress relief heat treatment eliminates residual stress to avoid weld cracking during high-temperature galvanizing. The automatic galvanizing production line strictly follows ISO1461 coating specifications, the zinc layer forms alloy combination with steel substrate, and will not fall off after bending, cutting and field construction, greatly reducing post-installation maintenance risks.

2.3 Double-Sided Zinc Coating, Dual Anti-Corrosion Protection Mechanism

Both inner and outer pipe walls are fully covered by continuous zinc protective layer, combining physical isolation and electrochemical sacrificial protection dual anti-rust functions. It can effectively resist atmospheric oxidation, rainwater erosion, soil electrochemical corrosion and coastal salt fog erosion, suitable for long-term overhead and buried outdoor use. Compared with black painted steel pipes, it has far longer service life and almost no regular anti-rust maintenance cost.

2.4 Stable Low Carbon Steel Base, Excellent On-Site Processing Performance

Q235B / S235JR / ASTM A53 Grade B low carbon steel has balanced strength and plasticity, supporting on-site cutting, drilling, welding, threading and grooving processing. The matte galvanized surface has moderate friction, convenient for scaffolding coupler clamping and flange connection without slippery installation trouble, significantly improving construction efficiency.

2.5 Graded Zinc Layer Customization Matching Different Service Environments

Light zinc layer (80–120g/㎡): Suitable for indoor temporary structures and short-cycle greenhouse projects, cost-effective and economical

Medium zinc layer (150–250g/㎡): Standard configuration for urban overhead water, gas pipelines and general building scaffolding

Heavy zinc layer (280–350g/㎡): Specially customized for coastal salt fog areas, saline soil buried pipelines and high-humidity agricultural greenhouses, ultra-long anti-corrosion cycle

2.6 Integrated Factory Direct Supply, Stable Large-Volume Delivery Capacity

Independent ERW welding production line and full-automatic hot-dip galvanizing workshop realize in-house full-process production without outsourcing processing links, realizing full-chain quality control. Conventional 76–660mm specifications maintain sufficient spot inventory, support full container bulk loading. The professional export team has rich overseas logistics operation experience, complete MTR and coating inspection documents to meet international engineering acceptance standards, with competitive ex-factory wholesale price for long-term cooperative bulk buyers.

3. Dimensional Tolerance 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
Pipe Straightness	≤1.5mm per meter
Out-of-Roundness	≤1.0% of outer diameter
Cutting Length	+100mm / −0mm

4. Mechanical & Chemical Properties of Base Low Carbon Steel

4.1 Mechanical Properties

Steel Grade	Min. Yield Strength	Tensile Strength	Min. Elongation	Mandatory Factory Test
Q235B	≥235MPa	370–500MPa	≥26%	100% hydrostatic tightness test, weld UT inspection, flattening & 180° cold bending test
S235JR	≥235MPa	360–510MPa	≥26%	Flattening test, cold bending test, weld tightness inspection
ASTM A53 Grade B	≥240MPa	≥415MPa	≥20%	Hydrostatic tightness test, weld eddy current NDT, reverse bend test

4.2 Maximum Allowable Chemical Composition (Mass %)

Grade	C Max	Mn Max	P Max	S Max
Q235B / S235JR	0.22	1.40	0.045	0.045
ASTM A53 Grade B	0.30	1.20	0.050	0.045

Note: All base pipes pass flattening and cold bending tests before galvanizing; third-party zinc coating thickness and adhesion test reports can be provided upon customer request.

5. Complete Manufacturing & Hot-Dip Galvanizing Process

Raw Material Inspection: Inspect chemical composition and mechanical performance of hot rolled low carbon steel coils, eliminate unqualified raw materials with internal segregation and uneven metallographic texture.

Slitting & Edge Finishing: Precision slitting to matched width, polish strip edges to remove oxide scale to ensure uniform and stable welding gap.

Multi-Roll Continuous Precision Forming: Gradual rolling molding to guarantee uniform roundness and consistent wall thickness of pipe blank.

HFW ERW High-Frequency Induction Welding: Closed-loop automatic parameter control to realize full penetration high-strength metallurgical welding seam.

Internal & External Weld Burr Removal: Online mechanical scarving to clear welding flash for smooth inner pipe wall and low fluid transmission resistance.

Weld Stress Relief Heat Treatment: Eliminate welding residual stress to prevent weld cracking during high-temperature galvanizing process.

Sizing & Straightening: Precision sizing mill calibrate outer diameter to standard tolerance range, straightener correct pipe linearity to meet specification requirements.

Fixed-Length Cutting: Neat burr-free cutting according to customer customized length requirements.

Base Pipe Pre-Galvanizing Inspection: 100% hydrostatic tightness test, full weld non-destructive flaw detection and full dimensional reinspection.

Standard Hot-Dip Galvanizing Procedure: Acid pickling rust removal → flux activation treatment → molten zinc dipping → air wiping excess zinc liquid → cooling passivation → zinc layer thickness & appearance inspection.

Finished Product Finishing & Marking: Deburr pipe ends, laser permanent marking including production standard, steel grade, OD×WT, zinc coating weight and batch number.

Export Standard Protective Packaging: Wear-resistant waterproof PE film wrapping to avoid zinc layer scratch during transportation, bundled with high-strength steel strips, plastic anti-collision caps installed at both pipe ends.

6. Main Application Scope

Municipal Engineering: Urban tap water trunk & branch pipelines, city natural gas distribution network, outdoor fire protection pipelines, rainwater and sewage delivery systems

Agricultural Greenhouse Engineering: Single-span/multi-span vegetable & flower greenhouse skeleton, farm livestock breeding shed support frame, agricultural irrigation auxiliary structure

Construction Industry: Building exterior scaffolding, temporary construction support frame, formwork supporting pipe, outdoor landscape guardrail and bracket

Mechanical & Municipal Supporting Facilities: Mechanical equipment chassis support, road safety guardrail, light steel warehouse frame, cable protection pipeline

Global EPC Engineering Projects: Overseas construction, agricultural and municipal engineering projects requiring long-term anti-corrosion zinc coated steel pipes

7. Quality Inspection & Factory Qualification Certification

Base pipe complies with GB/T3091, ASTM A53, EN10219; hot-dip galvanizing coating meets ISO1461, EN10240 international anti-corrosion standards

ISO 9001 quality management system certified integrated welding and galvanizing production factory

Dual independent inspection links: base pipe weld & hydrostatic performance inspection + finished galvanized pipe zinc thickness, adhesion and appearance full inspection

Complete Mill Test Report (MTR), zinc coating inspection certificate and factory qualification documents provided with each shipment

Support SGS, BV third-party on-site sampling inspection and global engineering acceptance standards

Full batch traceability system covering steel coil raw material to finished galvanized pipe delivery

8. Packaging & Bulk Delivery Arrangement

Packaging: Galvanized pipes wrapped with thick wear-resistant PE protective film to prevent zinc layer scratch and collision damage during transportation, bundled with high-strength steel strips, plastic anti-collision caps installed at both pipe ends.

Product Marking: Laser permanent marking including base pipe execution standard, steel grade, OD×wall thickness, zinc coating weight, batch number and production date.

Trade Terms: FOB, CIF, CFR, DAP global sea and land bulk delivery available

Main Shipping Ports: Tianjin, Qingdao, Shanghai, Ningbo, support full container bulk centralized loading

Customization Service: Custom fixed length, adjustable zinc coating thickness, threaded/grooved/beveled special pipe end processing

Delivery Cycle: Conventional spot galvanized specifications 7–12 working days; customized heavy zinc layer and special processed pipes 12–20 working days

9. Why Choose Our Zinc Coated Galvanized ERW Pipe Factory

Integrated production line of ERW welding and automatic hot-dip galvanizing, full independent quality control without outsourcing processing links

Complete 76–660mm full caliber series, one-stop bulk procurement solution for all anti-corrosion pipeline and structural engineering projects

Adjustable graded zinc coating thickness, matching indoor, outdoor, coastal and saline soil different corrosive service environments

Strict dual inspection of base pipe and finished galvanized product, stable zinc layer adhesion without peeling or shedding failure

Multiple low carbon steel grade options, flexible diversified pipe end processing to meet various construction and fluid transmission demands

Factory direct wholesale without intermediate markup, large spot inventory capacity to support stable long-term supply for large EPC engineering projects

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.