Study of mechanical and technological properties of lead brasses

Abstract

In a number of cases, when the product is exposed to chemical or mechanical influences, the material for its manufacture is brass with lead additive. A special lead additive to brass is produced in the manufacture of: a) wire, rod and sheet material, high malleability of which is combined with good ability to cold processing - drilling and milling and b) alloys for casting, for the purpose of good processing with cutting tools. In this case, brittle and short chips are usually obtained. This essay is the result of research into the extreme limits of lead content in brass according to GOSTs and some special types of brass containing lead used in industry. Research (see article) has shown that α-brasses containing 67-74% copper resist cracking well if they contain from 2.5 to 3% lead. Alloys of the L60 type, containing 2.5% lead, behave somewhat worse. Very poorly resist cracking of brass of the type 60-63% copper, containing 1.5-1.8% lead. Consequently, the best alloys with respect to "spontaneous cracking" are leaded a-brasses.