Material Acc of Structural Steel

This discussion is part of Material Acceptance - Steel Material for describe additional requirements of Structural Shape, Bar, Sheet pilling

a) Identification of Shape
a.i) The material shall be accepted as complying with the material specification if the material specification provides for the marking of each piece with the specification designation, including the grade, type, the heat number, Size of section, length, and mill identification on each piece; the manufacturer’s name and brand.

a.ii) Each structural shape shall be marked the color in accordance with material specification on one cut end or across the rolled face of one flange or leg, adjacent to one cut end. Color marking shall be distinct and of sufficient size to be clearly visible.

a.iii) If the material specification does not provide for the marking of each piece, the material shall be accepted as complying with the material specification provided the following requirements are met:
- Each bundle or shipping container is marked or substantially tagged showing the identification in accordance with the specification designation, including the grade, type, the heat number, Size of section, length, and mill identification on each piece; the manufacturer’s name and brand.

- The handling and storage of the material shall traceability to specific lot and order. It shall refer to inventory procedure of Material Management.

b) In the case where there is any harmful defect on the surface of steel plate and sheet, the manufacturer may remove or repair the defect by grinding or welding. In this case, the operation shall as follows:
b.i. Conditioning with grinder
- The thickness of the materials after conditioning shall fall within the tolerances on thickness.
Shallow imperfections on the top or bottom surface shall be subject to limitations that the area ground is well faired without abrupt changes in contour and the grinding does not reduce the thickness of the plate under the nominal thickness.
- The conditioned parts of the materials shall be finished neatly, and the boundary between the repaired portions on the as rolled surface shall be smoothly finished.

b.ii. Repair by welding
- The harmful defects of the materials shall be removed thoroughly by suitable means such as chipping or grinding prior to welding.
- The depth of the removed part shall refer to relevant material specifications.
- The repair by welding shall be carried out by suitable means for the kind of steel product.
- The heat treated steel plate and sheet themselves shall be heat treated once again after the repair by welding.
- When the material shall be repaired by welding, the surface to be welded shall be inspected using a magnetic particle method or liquid penetrant method to verify that the imperfections intended to be removed have been completely removed.
The welds and adjacent heat affected zone shall be sound and free of cracks, the weld metal being thoroughly fuse to all surface and edge without undercutting or overlap. Any visible cracks, porosity, lack of fusion, or undercut in any layer shall be removed prior to deposition of the succeeding layer.