| ASTM A53 /A106 Chemical Components and Machanical Property |
| Standard | Steel Grade | Chemical Components | Machanical Property |
| C | Mn | P | S | Cu | Ni | Cr | Mo | V | Tensile Strength (Mpa) | Yield Strength(Mpa) | Elongation (Mpa) |
| ASTM A53 | A | ≤0.25 | ≤0.95 | ≤0.05 | ≤0.045 | ≤0.40 | ≤0.40 | ≤0.40 | ≤0.15 | ≤0.08 | ≥330 | ≥205 | ≥29.5 |
| B | ≤0.30 | ≤1.20 | ≤0.05 | ≤0.045 | ≤0.40 | ≤0.40 | ≤0.40 | ≤0.15 | ≤0.08 | ≥415 | ≥240 | ≥29.5 |
| Standard | Steel Grade | Chemical Components | Machanical Property |
| C | Si | Mn | P | S | Cu ,Ni | Cr | Mo | V | Tensile Strength (Mpa) | Yield Strength(Mpa) | Elongation (Mpa) |
| ASTM A106 | B | ≤0.30 | ≥0.10 | 0.29-1.06 | ≤0.035 | ≤0.035 | ≤0.40 | ≤0.40 | ≤0.15 | ≤0.08 | ≥415 | ≥240 | ≥30 |
| C | ≤0.35 | ≥0.10 | 0.29-1.06 | ≤0.035 | ≤0.035 | ≤0.40 | ≤0.40 | ≤0.15 | ≤0.08 | ≥485 | ≥275 | ≥30 |
Spiral welded pipe: low carbon carbon structural steel or low alloy structural steel strip according to a certain Angle of the spiral line (called forming Angle) rolled into the tube blank, and then welded pipe seam made, it can use a narrower strip to produce large diameter steel pipe. The specifications are denoted by outer diameter * wall thickness. The welded pipe shall ensure that the hydrostatic test, tensile strength and cold bending performance of the weld shall meet the requirements.
Industrial TV internal inspection equipment: inspection of internal weld appearance quality.
Magnetic particle flaw detector: inspection of large diameter steel pipe near surface defects.
Ultrasonic automatic continuous flaw detector: to test transverse and longitudinal defects of full length welds of spiral steel pipes.
Ultrasonic manual flaw detector: reinspection of defect of large diameter steel pipe, inspection of repair welding seam and weld quality after water pressure.
X-ray automatic flaw detection machine and industrial TELEVISION imaging equipment: to test the internal quality of the full length welding seam of spiral steel pipe, sensitivity is not less than 4%.
X-ray film equipment: the original weld and repair weld inspection, sensitivity is not less than 2%.
2200 tons hydraulic press and microcomputer automatic recording system: test the bearing quality of each large diameter steel pipe.
