Spiral pipe surface treatment process

Spiral pipe (SSAW, Submerged Arc Welding Spiral Pipe) surface treatment is an important part of spiral pipe production, which directly affects its corrosion resistance and service life. The following will introduce the surface treatment process of spiral pipe in detail.

1. Spiral pipe surface treatment method

Treatment methods	Process content
Sandblasting	High-pressure blasting of steel grit or steel shot removes rust and scale and increases roughness.
Acid pickling	Acidic solution is used to remove oxides and impurities, suitable for mass production.
Phosphating	Phosphate film is formed to improve coating adhesion and provide short-term rust protection.
Coating spraying	Anti-corrosion materials (such as epoxy resin, polyethylene) are applied to provide long-term corrosion protection.
Mechanical brush cleaning	A steel brush cleans the surface to remove large areas of rust or dirt.

2.Surface treatment process flow

Steps	Process content
Surface cleaning	Remove surface oil and impurities through mechanical cleaning (such as steel brush) or chemical cleaning.
Sandblasting	High-pressure sandblasting removes oxide scale and adjusts surface roughness to design requirements (40–100μm).
Roughness check	Use a surface roughness meter to test the steel surface after sandblasting to ensure that it meets the design standards (such as Sa 2.5).
Drying before coating	Clean surface residues and ensure that the surface is dry and free of moisture to prevent the coating from losing adhesion.
Spray coating	Apply anti-corrosion coatings such as 3PE coatings (bottom layer epoxy resin + middle layer adhesive + surface layer polyethylene) according to design requirements.
Cure test	After the coating is cured, adhesion, thickness and impact resistance tests are performed to ensure that the surface treatment quality meets the standards.

3.Technical Parameters

Parameter name	Sandblasting	Pickling treatment	Coating spraying
Cleanliness level	Sa 2.5–Sa 3 (ISO 8501-1)	N/A	N/A
Roughness range	40–100μm	20–40μm	N/A
Coating thickness	N/A	N/A	300–1500μm
Processing time	10–20 minutes/session	15–30 minutes	4–6 hours

Through scientific and reasonable process design and strict quality control, we are able to provide customers with high-performance product solutions to meet the needs of different engineering projects. If you need to learn more or customize services, please contact our team.

Spiral steel pipe，SSAW pipe，Surface treatment

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