BS ISO 4978:2018 pdf free

BS ISO 4978:2018 pdf free.Steel sheet and strip for welded gas cylinders
The steel sheet and strip shall be accepted in test unit. The test unit shall have a mass of no greater than 80 tons and shall consist of material from the same cast. Other requirements for the formation of test unit, such as same rolling unit and same thickness, shall be as specified in ISO 404.
The position from which the sample is to be taken shall lie halfway between the edge and the axis of the product and, in the case of coils, at the outer end of the coil. In cases of dispute, the distance between the outer end of the coil and the position from which the sample is taken shall be 1 m or greater :8.4 From each test sample, one tensile test piece, three impact test pieces and one bend test piece (if agreed) shall be prepared with the direction transverse to final rolling. If the thickness is 3 mm or greater,tensile test piece shall be of rectangular section with dimensions in accordance with the requirements of ISO 6892-1. The width of the parallel portion shall not exceed 30 mm. The thickness shall be that of the product. If the thickness is less than 3 mm, the dimensions of the test pieces shall be those given in ISO 6892:1 for a gauge length of 80 mm.
Unless otherwise agreed at the time of enquiry and order, the choice of a suitable physical or chemical analytical method for the heat analysis shall be left to the discretion of the manufacturer. In cases of dispute, the analysis shall be carried out by a laboratory approved by both parties. In this case,the analysis method to be used shall be agreed upon, if possible, with reference to the corresponding International Standards. If no International Standard is available, the method to be used shall be agreed between the parties concerned.
If a product analysis is required, the number of test pieces to be taken shall be agreed between the parties concerned. The test pieces shall be taken either from the samples used for the verification of the mechanical properties, or from the whole thickness of the product at the same location as for the mechanical test pieces.BS ISO 4978 pdf free download.