Chrome-moly steel is about double the specific strength (ratio of
ultimate strength divided by density) of mild steel. That's why they
often use chrome-moly in airplanes, and never use mild steel.
https://en.wikipedia.org/wiki/Specific_strength
As you can see from the chart, mild steel has a specific strength of
71-85 kN m/kg, while low-carbon steel has a specific strength of 46 kN m/kg.
Looking further down the chart, you can see why they use carbon fiber
composite (785 kN m/kg) to build modern airplanes.
Chrome-moly (4130) is often chosen for its ease of fabrication and its
forgiving nature when abused. It can be welded (or brazed) without
subsequent heat treatment, and it deforms ~25% before failure. (It
stretches like taffy before it comes apart.) It also has a high fatigue
resistance.
Bill D.
About double On 12/4/2019 7:31 AM, Paul Compton via EV wrote:
On Tue, 3 Dec 2019 at 03:27, Lawrence Rhodes via EV <ev@lists.evdl.org> wrote:
Using chromoly will reduce the weight.
Oh, is Chrome Molybdenum Steel somehow magically lighter than mild Steel?
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