Mechanical Properties of SSAW Steel Pipe

SSAW Pipe (Spiral Submerged Arc-Welding Pipe), also called HSAW pipe (Helical SAW), welding line shape like a helix. Manufacturing process is rolling the steel strip, to make the rolling direction have an angle with the direction of the pipe center, forming and welding, so the welding seam is in a spiral line.

Below we will introduce you the mechanical properties of SSAW steel pipe.

The material of spiral steel pipe, the commonly used materials in China are: Q235A, Q235B.Q23b, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb. Q345 L245 L290 X42 X46 X70 X80

The mechanical properties of SSAW steel pipe is an important indicator to ensure the final performance (mechanical properties), which depends on the chemical composition of the steel pipe and the heat treatment system. Therefore, according to different application requirements, the mechanical properties of the SSAW steel pipe are introduced from the aspects of tensile strength, yield point, and elongation.

1.Yield Point

The metal material with yield phenomenon, the stress when the sample does not increase during the stretching process (keep constant) can continue to extend, called the yield point. If the force decreases, the upper and lower yield points should be distinguished. The unit of yield point is N/mm2 (MPa).

2.Tensile strength

During the tensile process, the maximum force (Fb) that the sample bears when it is broken, and the stress (σ) obtained from the original cross-sectional area (So) of the sample is called the tensile strength (σb), and the unit is N/mm2 (MPa). It represents the maximum ability of metal materials to resist destruction under the action of tension.

3.Elongation after break

In the tensile test, the percentage of the length that the gauge length increases after the specimen is broken to the original gauge length is called elongation. Expressed by σ, the unit is %.