UNE 36-075:1981 specifies requirements for seamless, circular hollow steel bars intended for manufacturing tubular and ring-shaped machined components. It covers steel grades, chemical composition, mechanical properties, manufacturing and supply conditions, dimensional requirements, tolerances, inspection, testing, identification, packaging, and transportation.
The standard includes requirements for A 491 and C 36 k steels, hot-finished or normalized supply conditions, tensile testing, surface and dimensional quality, and nominal hollow-bar dimensions ranging from small to large sizes. It also references related UNE standards for sampling, chemical analysis, mechanical testing, and general supply conditions.
Application Scope: Applicable to producers, purchasers, inspectors, and engineers specifying or evaluating seamless hollow steel bars for machining and the manufacture of load-bearing tubular or ring-shaped machine components.
