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

Q195 is a carbon structural steel with yield strength of 195MPA and advantages of high plasticity, toughness and weldability.

Q195 Chemical composition (%)

C:≤0.12, Mn:≤0.50, Si:≤0.30, S:≤0.040, P:≤0.035

Tensile strength

315-430 (σb/MPa)

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Q235A ingredients: Mn - 0.30-0.65, the Si - 0.3, S -- 0.05, p - 0.045;

Q235B ingredients: Mn - 0.30-0.70, the Si - 0.3, S P - 0.045-0.045.

The carbon content of steel made of Q235A is between 0.14-0.22%, and the carbon content of steel made of Q235B is between 0.12-0.20%. Secondly, in tensile and impact experiments;material Q235A steel does not do impact test, material Q235B steel to do room temperature impact test, V-notch.

The mechanical properties of steel made of Q235B are stronger, and the mechanical properties of steel made of Q235A are weaker.

Q235B is stronger in welding performance, while Q235A is weaker.

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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.