Q235B Steel pipe is a steel strip plate for raw materials, often warm extrusion molding, automatic double wire double-sided submerged arc welding technology welded pipe.
Carbon c: ≤ 0.20
Si: ≤ 0.30
MN MN: 0.30 ~ 0.70
Sulphur s: ≤ 0.045
P: ≤ 0.045
CR CR: allowable residual content ≤ 0.30
Ni ni: Allow residual content ≤ 0.30
Cu cu: allowable residual content ≤ 0.30
Note: Deoxidation method: F, B, Z
Q235B Steel pipe characteristics:
Q235B Straight seam welded pipe production process is simple, high production efficiency, low cost, rapid development.
The strength of Q235B spiral welded pipe is generally higher than that of straight seam welded pipe, which can produce pipe with larger diameter with narrower billet, and can produce pipe with different diameters with the same width.
But compared with the Q235B same length of straight seam tube, the weld length increases $number and the production speed is lower.
Therefore, the smaller-caliber Q235B welded pipe mostly adopts straight seam welding, and the large diameter welded pipe is mostly used spiral welding
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