Besi Terbaik

Besi Terbaik 

Why can't steel produced after 1945 be used in space-related products? Why is contamination of our atmosphere a particular problem for steel used in space exploration?

https://www.quora.com/Why-cant-steel-produced-after-1945-be-used-in-space-related-products-Why-is-contamination-of-our-atmosphere-a-particular-problem-for-steel-used-in-space-exploration-How-much-of-this-type-of-scrap-steel-is-available-What-is-its-worth

There is such a thing as low-background steel.  That is steel that was produced before the nuclear explosions from 1945 and later (nuclear tests) raised the level of radioactive dust in the atmosphere.

The process of making steel involves blowing air into a furnace.  That air can be contaminated with radioactive dust.  The dust can then become embedded in the steel, making it slightly radioactive.

For most purposes, this radioactivity is easily ignored.  But for certain purposes, such as very sensitive sensors like Geiger counters, it is preferable to use materials that are not radioactive.  There was plenty of such metal available from the scuttled German naval fleet.

So, while some small components on spacecraft may have been built using low-background steel, it is not a restriction placed on spacecraft in general.  It is also possible to produce components in a pure environment to avoid the contamination, it just costs more.

Also, with each year, it becomes less of a concern to anyone.  Background radiation levels peaked in the early 60s and are now 1/30th of what they were, then.

Also, there isn't a lot of steel in spacecraft.  Steel is heavy.  Aluminum is much preferred.  The Node modules on the ISS were each carved out of solid blocks of aluminum.