Spiral welded steel pipe is also known as the spiral steel pipe and spiral welded pipe,which is use low carbon structural steel or low alloy steel strip according to the angle of the spiral line (called the forming angle) rolled into a tube, and then the tube welded together made, it can be a narrow strip production of large diameter steel pipe. The coil is mainly used for oil and gas pipelines, its specifications OD * wall thickness. Side welding and double-sided welding spiral welded pipe should ensure that the hydrostatic test, the tensile strength of the weld and cold bending performance required.
(1)the pressure fluid transmission spiral submerged arc welded pipe: mainly used for transporting oil, natural gas pipeline;
(2)the pressure fluid transmission high frequency welded steel pipes with spiral seam: welded high-frequency lap welding method for pressure fluid transmission spiral high-frequency welded steel pipe. Ability of steel pipe under pressure, good plasticity, the ease of welding and molding process;
(3)low pressure fluid transmission spiral submerged arc welded steel pipe: double-sided automatic submerged arc welding or single-sided welding into the legal system for low pressure fluid such as water, gas, air and steam with submerged arc welded pipe.
Seamless pipe product characteristics:
1. seamless tube process performance test: flattening test, tensile test, impact test, flaring test, hardness test, metallographic test, bending test, nondestructive testing (including eddy current X-ray and ultrasonic testing).
2.Seamless pipe chemical analysis: the chemical composition of the material for chemical analysis, chemical composition to meet the standard requirements.
3.Seamless pipe pressure and hydrostatic test is for pressure tube by into the hydrostatic test, which do not maintain the prescribed pressure value not less than 5 seconds, not to disclose, the regular supply hydraulic pressure test is 2.45MPa pressure The pressure test is P = 0.5MPAa.
4.The corrosion test: industrial corrosion-resistant steel pipe according to standard regulations or agreement between the corrosion of steel pipe corrosion resistance test, no intergranular corrosion.
Characteristics of seamless pipe
(1) the outer diameter is smaller.
(2) High precision can do small quantities of raw.
(3) cold drawn steel pipe with high precision and good surface quality.
(4) steel pipe cross area is more complex.
(5) steel pipe superior performance, relatively dense metal.
Post time: Sep-19-2019