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
Grade
|
Width (mm)
|
Width tolerance (mm)
|
Thickness (mm)
|
Thickness tolerance min/max (mm)
|
Inside diameter of coil (mm)
|
Inside diameter tolerance (mm)
|
X65
|
1605
|
+20,-0
|
12.7
|
11.43/ 13.97
|
740
|
±5
|
1920
|
+20,-0
|
12.7
|
11.43/13.97
|
740
|
±5
|
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.