Material properties of steel for spring
Material properties of steel for spring
(OP)
I have tested heating of springs at different temperatures and duration (i only know my steel is steel grade 70)
I have noticed as temperature/duration goes up, the steel color turns from silver -> yellow/brass -> reddish/brown -> purple ->blue -> light blue
I would like to know, for my purposes (a trampoline spring, with maximum load 55kg) what color indicates the best heat treatment and what properties does the color exhibit. I would like high spring strength but also high fatigue life.
Thanks in advance.
I have noticed as temperature/duration goes up, the steel color turns from silver -> yellow/brass -> reddish/brown -> purple ->blue -> light blue
I would like to know, for my purposes (a trampoline spring, with maximum load 55kg) what color indicates the best heat treatment and what properties does the color exhibit. I would like high spring strength but also high fatigue life.
Thanks in advance.





RE: Material properties of steel for spring
I'm mainly talking about the ends of the hooks of the springs (the cross sectional ends at the end of spring when its cut during manufacturing), is where the color change occurs. the body of the spring also changes color but slower - for example, by the time the hooks are blue, the body is still only yellowish/brown
RE: Material properties of steel for spring
The term "Grade 70" does not mean much, by itself, but it could be used to describe material with a minimum UTS of 70 KSI. This is not usually considered a hardenable steel and may not respond predictably to heat treatment. I would need quite a bit more informtion to be more specific, but, in general, you will do more harm than good unless you know what you are doing.
rp
RE: Material properties of steel for spring
However since you have end hooks that you want to bend before they brake you may need to temper at a higher temperature than you would just for the spring itself.
It sounds like you need to build a test fixture to load springs and see how durable they are.
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Plymouth Tube
RE: Material properties of steel for spring