Product information：

Spiral seam submerged arc welded steel pipe SY5036-83 for pressurized fluid transportation is mainly used for transporting oil and natural gas pipelines;

Spiral seam high frequency welded steel pipe SY5038-83 for pressure fluid transportation, welded by high frequency lap welding method, for spiral seam high frequency welded steel pipe for pressure fluid transportation. The steel pipe has strong bearing capacity, good plasticity, easy to weld and process;

General low-pressure fluid transport with spiral seam submerged arc welded steel pipe SY5037-83, the use of double-sided automatic submerged arc welding or single-side welding method for water, gas, air and steam and other general low-pressure fluid transport submerged arc welded steel pipe.

Now the commonly used standards for spiral steel pipes are generally divided into :SY/T5037-2000(Ministry standard, also known as spiral seam submerged arc welded steel pipes for ordinary fluid transportation pipes)

GB/T9711.1-1997(National standard, also known as the oil and gas industry steel pipe delivery technical conditions ** part: Class A steel pipe (up to now there are strict requirements of GB/ T9711.2-B steel pipe))

API-5L(American Petroleum Institute, also called pipeline steel pipe; Which is divided into PSL1 and PSL2 two levels), SY/T5040-92(spiral seam submerged arc welded steel pipe for pile).

National standard GB/ T9711.1-1997

Ministry of Petroleum Industry Industry standard SY/T5037-2000

USA APISPEC 5L welded steel pipe standard

Applicable engineering scenarios

Municipal high-pressure water supply, long-distance water transmission main pipes in mountainous areas; medium-pressure gas branch lines, chemical medium transportation in factory areas; large bridge pile foundations, steel caissons for docks, deep foundation pit support; high-pressure water diversion for water conservancy reservoirs, cross-river high-pressure pipelines; wind power foundations, heavy steel structure support pipelines for factories.

Q355A Chemical composition (%) : C: 0.18-0.28, Mn: 0.40-0.70, Si:≤ 0.30, S: ≤0.050 or less , P:≤ 0.045

Q355B Chemical composition (%) : C: 0.18-0.28, Mn: 0.40-0.70, Si:≤ 0.30, S: ≤0.045 or less , P:≤ 0.045

Mechanical properties:

Tensile strength (σb/MPa):410-550

Elongation (δ5/%):

≥24(a≤16mm), ≥23(a>16-40mm)

≥22(a>40-60mm), ≥21(a>60-100mm)

≥20(a>100-150mm), ≥19(a>150mm)

Where a is the thickness or diameter of the steel.

Our Q355B high-strength spiral welded pipe is produced using low-alloy high-strength steel strips through double-sided submerged arc welding. The pipe has an inner diameter ranging from 219mm to 3620mm and comes in various wall thicknesses. It has high strength and superior pressure-bearing and load-bearing performance compared to Q235. It is suitable for high-pressure water transmission, gas branch lines, bridge pile foundations, and heavy-load water conservancy projects. It supports 3PE and epoxy coal tar coating for anti-corrosion. It can be customized to specific lengths, undergo full inspection through water pressure testing, and the supply is stable.