Product Overview
This product line covers hot-dip galvanized round seamless and welded alloy steel pipes specifically engineered for oil tubing applications, with a full outer diameter range from 20mm to 219mm. Manufactured from premium carbon and alloy steels, each pipe undergoes hot-dip galvanizing to form a dense zinc-iron alloy layer on both inner and outer surfaces. The result combines the pressure integrity of seamless construction with the long-term corrosion resistance of galvanizing, making it ideal for downhole oilfield operations, oil transport, and low-pressure fluid piping.
Key Advantages
1. Dual Manufacturing Processes for Precise Application Matching
Seamless Series: Formed through hot-rolling piercing of round billets, with no weld seam in the pipe body, eliminating potential risks from welding heat-affected zones. Suitable for high-pressure, high-temperature, and acidic medium conditions. Seamless pipes have a weld joint factor of 1.0, offering superior pressure capacity compared to welded pipes.
Welded Series: Manufactured using high-frequency electric resistance welding (ERW), offering better wall thickness uniformity and cost efficiency. Suitable for medium and low-pressure oil transport and structural support applications. Modern ERW technology enables weld seam strength to meet or exceed that of the parent material.
2. Hot-Dip Galvanizing for Doubled Service Life
The hot-dip galvanizing process forms a zinc-iron alloy layer through metallurgical bonding between the zinc coating and steel substrate, providing strong adhesion and corrosion resistance far exceeding electro-galvanizing. Zinc coating weight can be customized (typical range 120–500 g/m²), effectively resisting atmospheric corrosion and oilfield medium attack. The zinc layer provides sacrificial anode protection, protecting exposed steel even when locally damaged.
3. Purpose-Built for Oil Tubing
Optimized for oil tubing applications, suitable for oil transport, downhole tubing, oil heaters, and condenser coolers in petroleum industry equipment. Pipe end processing available: Plain End, Beveled, Threaded, Grooved - meeting various connection requirements.
Technical Specifications
| Item | Parameters |
|---|---|
| Outer Diameter Range | 20mm – 219mm |
| Shape | Round |
| Manufacturing Process | Seamless (SMLS) / ERW |
| Galvanizing Process | Hot-Dip Galvanized |
| Zinc Coating Weight | 120–500 g/m² (Customizable) |
| Wall Thickness | Per standard or customized |
| Fixed Length | 6m / 12m / Customized |
| Pipe End Types | Plain / Beveled / Threaded / Grooved |
Applications
Oilfield Downhole Tubing: Hot-dip galvanized seamless pipes for oil well tubing and transport lines; zinc coating resists oilfield water and acidic medium corrosion.
Petroleum Refining Equipment: Pipes for oil heaters, condenser coolers, coal tar wash oil exchangers, and other chemical coking equipment.
Low-Pressure Fluid Transport: Line pipes for water, gas, oil, and other low-pressure fluids.
Structural Support: Trestle pipe piles, mining tunnel support frames, and other structural uses.
Quality Assurance
Material certificates and zinc coating test reports available for each batch
Third-party inspection supported (SGS, BV, etc.)
Hydrostatic testing or eddy current testing can be performed upon customer request
Products
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