5.3　Non-Pressure Part

5.3.1　Steels for non-pressure parts shall be those specified in applicable material standards or covered in GB 50017.

5.3.2　Steels for non-pressure parts that are welded to the pressure parts of the columns shall have satisfactory weldability and shall not alter the performance of pressure parts,provided that the operating conditions(feedstocks,loads,etc.)are met;Where connecting pads(or stiffeners)are applied,the material of connecting pads shall be the same as or similar to that of the column shell.

5.3.3　Unless otherwise specified,the material properties of fasteners for bolting internals shall not be lower than that of 0Cr13.