SU240256A1 - FOUNDRY ALUMINUM ALLOY FOR DETAILS OF PUNCHES - Google Patents

Description

A cast aluminum alloy has been proposed for the manufacture of parts for projectiles of destructive cumulative perforators used in blasting operations in particularly deep boreholes. Known alloys of the A1-Si-Cu system are difficult to cast due to insufficiently good fluidity and high restrictions on the iron content. These alloys do not have the necessary fragmentation, which is very important for the details of perforators. In contrast to the known alloy, titanium was additionally introduced in the amount of 0.1-0.2o / o to increase the strength properties. The alloy increased the silicon content to 11-12p / o, which provided it with better fluidity and high tightness. The alloy has the ability to withstand a hydrostatic pressure of more than 1000 atm at a temperature of 200 ° C. The iron content in the alloy to 0.5 o / o instead of 0.25 / o in known alloys simplifies casting of the alloy, especially in mass production. The chemical composition of the alloy (V / O): silicon 11 -12 copper 4.8-5.2 In a cast state at room temperature, the strength of the alloy is 29.0 kg / mm elongation 2.2) / o, hardness 110 kg / mm, tensile strength at 200 ° С 24.5 kg / ml1. After heat treatment at room temperature, the mechanical properties of the alloy are as follows: tensile strength 38.0 kg / mm, relative elongation 2.0 o / o, hardness 159 kg / mm, strength at 200 ° С 32.5 kg / mm -. Thus, the specified CBoiicTBa alloy and high fragmentation make it possible to use it in the oil and gas industry for the manufacture of parts for sieves of destructive cumulative perforators. The subject of the invention Casting aluminum alloy for parts of perforators containing silicon, copper and iron, characterized in that, in order to improve technological and mechanical properties, titanium was introduced into it in the following ratio of components (i / o). silicon11 -12 copper4.8-5.2