tender for purchase of s.s. tubes , s.s. tubes of 304 grade as per specification according to is. 13316/1992, hydraulically tested at 1000 p.s.i. annealed and pickled at 1100 deg. centigrade tensile strength 650 kns/mm2 elongation 50% (a) size : od = 45 mm, length = 2010 mm, thickness = 1.5 mm , b) size: od= 45 mm, length = 4065 mm, thickness = 1.5 mm , (c) size : od =102 mm, length = 1225 mm, thickness = 1.5 mm , d) size : od =102 mm, length = 900 mm, thickness = 1.5 mm the following physical tests are to be carried out and all tests certificates should be attached with the invoices. (i) flattening test. (ii) reverse bend test. (iii) reverse flattening test. (iv) hardness test. make : (i) m/s quality stainless pvt. ltd., hisar. (ii) m/s divine tubes pvt. ltd., ahmedabad. (iii) m/s adinox overseas, mumbai. (iv) m/s apex tube pvt. ltd., or steelway india corporation, ahmedabad (authorised marketing chennal partner by m/s apex tubes pvt ltd.,)