Steel Pipe the hot coil inspection

Steel strips for carbon steel pipe producing 

  • Qualified supplier: Sunny Steel Co Ltd.
  • Hot rolling coil: Sunny Steel Co Ltd.
  • Manufacture process: The steel should be made in a oxygen blowing converter or an electric furnace and shall be full killed and fine grained suffering rolling controlled treatment.
  • Dimension, weight, length and tolerance
Width (mm)
Width tolerance (mm)
Thickness (mm)
Thickness tolerance min/max (mm)
Inside diameter of coil (mm)
Inside diameter tolerance (mm)
11.43/ 13.97

The hot coil shall be inspected before production according to the following requirements:

1. to re-inspect the supplier name, contract no, grade, heat no’, coil no, specification (width and W.T.) ;

2. to store the hot coil by the same specification and heat no.;

3. to inspect the workmanship of the hot coil:

- The surface shall be clean and in well condition;

- There shall not be any defects like cracks, scar, fold, blister and inclusion etc. on the surface;

- The steel sheet may contain the dents, gouge, score, or any other imperfection that has a depth not greater than 0.3mm and guarantee the specified min. wall thickness.

- There shall not be any defects like cracks, contractive hole, lamination etc. after edge cutting.

4. Re-test of hot coil’s chemical composition and mechanical properties.

- See the “Chemical Composition Analysis” and “Mechanical Properties Test”

5. Only after the hot coil qualified by the above tests and inspection, can it be used for production; 

The unqualified hot coilshall be tagged and stored separately.

Welded pipes by manufacturing process

Sunny Steel produce an extensive selection of welded steel pipe including ERW, HFI, EFW, LSAW, DSAW and UOE type carbon steel pipe along with their respective flanges and fittings.

Electric Resistance Welded Pipe
High Frequency Induction (HFI) Welded Pipe
UOE (Uing and Oing forming) Pipes

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Our team are highly trained and experienced in servicing and producing all types of steel supplies. Whether you've got a large construction project, or need parts for industrial machinery, our team of steel fabrication consultants will ensure that your project is provided with the parts you need, when you need them.

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