BS 6744 pdf free download
BS 6744-2001 pdf free download.Stainless steel bars for the reinforcement of and use in concrete — Requirements and test methods.
8.2 Product analysis The maximum deviations in product analysis from the values specified for cast analysis shall be in accordance with those given in BS EN 10088-3. 9 Surface quality All bars shall be free from defects or other surface contamination which can be shown to adversely affect the corrosion or mechanical properties of the steel specified in this Standard. If more exact requirements for surface quality are necessary, these shall be agreed at the time of enquiry and order, where appropriate, on the basis of BS EN 10221.
10 Surface geometry
10.1 General Bars shall have either a ribbed or plain surface. Measurement of geometrical characteristics shall be in accordance with Annex C. NOTE The stainless steel products covered by this British Standard are characterized by their surface geometry, which enables them to bond with the concrete.
10.2 Relative rib area The relative rib area, f R , shall be regarded as the ruling criterion for the bond performance of ribbed products. The value of f R as a function of the nominal size, as determined in accordance with C.3, shall be in accordance with Table 6.
10.3 Geometry of rib
10.3.1 General The products shall have two or more rows of parallel transverse ribs, equally distributed around the perimeter with a uniform spacing over the entire length. NOTE Longitudinal ribs may be present or not.
10.3.2 Transverse ribs
10.3.2.1 Transverse ribs shall have a crescent shape and shall merge smoothly into the core of the product (unless the same product properties can be achieved by other special surface configurations).
10.3.2.2 The projection of the ribs shall extend over at least 80 % of the periphery of the product, which shall be calculated from the nominal size and the transverse ribless parameter in accordance with C.2.5.
10.3.2.3 The rib flank inclination, !, measured in accordance with C.2.7, shall be greater than or equal to 45° and radiused at the transition to the core of the product (see Figure C.2). 10.3.2.4 The angle of rib inclination, measured in accordance with C.2.6, shall be between 35° and 75° (see Figure C.1). 10.3.2.5 The rib height, a, measured in accordance with C.2.1, shall be 0.05d to 0.10d (see Figure C.2), the rib spacing, c, measured in accordance with C.2.3, shall be 0.5d to 1.0d (see Figure C.1).
10.3.3 Longitudinal ribs Where longitudinal ribs are present, their height, measured in accordance with C.2.2, shall not exceed 0.15d. Minor deviations from the values given in 10.3.2 and 10.3.3 shall be permitted provided that the specifications for the relative rib area according to Table 6 are satisfied.
11 Conditions of supply
11.1 Ribbed bar shall be supplied in coil or straight lengths, or fabricated in accordance with BS 8666 in the following conditions:
a) hot rolled and descaled;
b) hot rolled, descaled and cold worked.
11.2 Plain bar shall be supplied in coil or straight lengths, or fabricated in accordance with BS 8666 in the following conditions:
a) hot rolled and descaled;
b) hot rolled, descaled and cold worked;
c) hot rolled and bright finished. 12 Mechanical and physical properties 12.1 Tensile properties The 0.2 % proof strength, R p0.2 , stress ratio, R m /R p0.2 , and elongation at fracture, A 5 , of the steel obtained from test samples selected, prepared and tested in accordance with Annex D, shall be as specified in Table 7. For routine testing the 0.2 % proof strength shall be considered a minimum value. For determination of long term quality level, the values given in the table shall be for the characteristic strength (see 3.1.22).
