Material Acc of Steel Plate

This discussion is part of Material Acceptance - Steel Material for describe requirements of Steel Plate

a) Material steel plates that it subject to stress due to pressure shall have material test report or certificate of compliance as provided in the material specification.

The material examiner shall examine the material test report or certificate of compliance and shall determine that it represents the material and meets requirements of the material specification.

b) Identification of plate

b.i) Required plate marking

Plate shall be legibly marked minimum with the following: applicable grade; heat number; width and length and thickness; color marking; brand of the manufacturer.

The size of steel strip shall expressed by thickness and width.
b.ii) Types of Marking

Any required color marking shall be by paint marking, unless otherwise specified.

b.iii) Location of Marking
The required markings shall be in at least one place on each finished plate.
b.iv) Color Marking

It shall refer to material specification; Color markings shall be distinct and of sufficient size to be clearly visible.

c) 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:
c.i. Conditioning with grinding

- The thickness of the steel plate and sheet 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 steel plate and sheet shall be finished neatly, and the boundary between the repaired portions on the as rolled surface shall be smoothly finished.

c.ii. Repair by welding

- The harmful defects of the steel plate and sheet 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.