Allen Bradley 1786-BNC New In Box

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This Indian Standard (Fourth Revision) was adopted by the Bureau of Indian Standards, after the draft finalized by the Concrete Reinforcement Sectional Committee had been approved by the Civil Engineering Division Council. The standard was first published in 1961 and subsequently revised in 1966, 1979 and 1985. In its second revision of 1979, the title of the standard was modified to ‘Specification for cold-worked steel high strength deformed bars for concrete reinforcement’. In the third revision, IS 1139:1966 ‘Specification for hot rolled mild steel, medium tensile steel and high yield strength steel deformed bars for concrete reinforcement’ was merged in the standard and the title was modified to ‘Specification for high strength deformed steel bars and wires for concrete reinforcement’.

The restriction to cold working was removed in this revision and the manufacturers were allowed to resort to other routes to attain high strength. High strength deformed bars and wires for concrete reinforcement are being produced in the country for many years by cold twisting and by controlled cooling and micro-alloying. A brief note on controlled cooling process is given in Annex A for information only. In the past few years there has been increasing demand for higher strength grades with higher elongation for various applications. This revision has been taken up to incorporate various changes found necessary as a result of experience gained and technological advances made in the field of steel bars and wires manufacturing, This revision incorporates the properties of high strength deformed steel bars and wires, and it is left to the manufacturer to adopt any process to satisfy the performance requirements.

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