Tensile Safety
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Do you know the yield strength, factor of safety, and tensile strength for 4130 (chromoly) steel?
Reynolds makes a 4130 called Reynolds 525. It's a general all-purpose tube - less expensive than 853.
The 4130 is a code of the American Iron & Steel Institute and defines the approximate chemical composition of the steel.
The "41" denotes a low alloy steel containing nominally 1 percent chromium and 0.2 percent molybdenum (hence the nickname "chromoly"). The "30" denotes a carbon content of 0.30 percent. In addition, as normal constituents of plain carbon and low alloy steels, there will be around 0.2-0.5 percent silicon, 0.5-1.0 percent manganese, and well under 0.1 percent of each of a dozen or so other elements whose presence is unavoidable, in a few cases deliberate, and generally not harmful. The remaining 97-98 percent is iron (Fe).
There are many tens, perhaps hundreds, of different steels defined by that AISI 4-digit code system. The code does not specify any particular mechanical properties, only approximate chemical composition. For any particular grade (composition) (AISI number) of steel, the mechanical properties depend on what heat treatment has been applied, and what (if any) cold work has subsequently been done.
UTS: 48 - 58 Tsi, 100 - 130 Ksi,
700 - 900 MPa
4130 steel (AKA – Chromoly) - yield strength of about 75,000 psi .
FACTOR OF SAFETY: 2.7
