CMD-III/16:1786 - BIS

Doc:STI/1786/PP/5Sept. 20085.3.4 The location on the finished product from where the test samples are to be takenand the procedure for the preparation of the test pieces from test samples shall bein accordance with clause 9.1 of the specification.5.3.5 RE-TEST - If any one of the test pieces first selected fails to conform to any ofthe tests as given in the specification, two further samples shall be selected fortesting in respect of each failure. Should the test pieces from both these additionalsamples pass, the material represented by the test samples shall be deemed as fitto be covered under BIS Certification Marks Scheme.5.4 DEFORMATIONS AND SURFACE CHARACTERISTICS - For highstrength deformed bars/wires, the mean area of ribs (in mm 2 ) per unit length (inmm) above the core of the bar/wire, projected on a plane normal to the axis of thebar/wire calculated in accordance with 5.4 of the specification shall not be lessthan the following values:0.12 Ǿ for Ǿ < 10 mm0.15 Ǿ for 10 mm < Ǿ < 16 mm0.17 Ǿ for Ǿ > 16 mmWhere Ǿ is the nominal diameter of bar/wire in mm.The mean projected area of transverse ribs alone shall be not less than one-third ofthe values given above.The calculations for mean projected area Ar may be done as per Cl.5.4, 5.5 and5.6 of the specification. Frequency of such calculation shall be once in a day foreach size rolled.5.4.1 When subjected to pull-out test in accordance with IS 2770(Part-1) of thespecification the bond strength calculated from the load at a measured slip of0.025 mm and 0.25 mm for deformed bars/wires shall exceed that of a plain roundbar of the same nominal size by 40 per cent and 80 per cent respectively. Thebond test in such cases shall be done in accordance with IS:2770 (Part I). Pull outrest shall be done in addition to 5.2 for appropval of new or amended geometryfor the first time.5.4.2 The licensee shall also verify the deformation pattern of the high strengthdeformed steel bars and wires on the production line preferably at an interval ofone hour at each twisting machine against the registered design. Proper recordsshall be maintained for this.6. REJECTIONS – A separate record shall be maintained giving informationrelating to the rejection of the production not conforming to the requirements ofthe specification and the method of its disposal. Such material shall in nocircumstances be stored together with that conforming to the specification.7 SAMPLES – The licensee shall supply, free of charge, the samples required inaccordance with the Bureau of Indian Standards (Certification) Regulations, 1988,as subsequently amended, from the factory or godowns. The Bureau shall pay forthe samples taken by it from the open market.