How about A709 grade 50 machinability

A709 grade 50 steel is high strength low allow structural steel. Its atmospheric corrosion resistance in most environments is substantially better than carbon steel with or without copper addition. A709 grade 50 steel shall have an atmospheric corrosion index of 6.00 or higher. How about A709 grade 50 machinability?

A709 grade 50 machinability is fair. As it contains alloy elements, A709 grade 50 steel is tougher to machine than ordinary carbon steel. A709 grade 50 machinability is similar to AISI 8615 alloy steel.

A709 grade 50 steel requires a minimum yield strength of 50 ksi. It is mainly used in building bridge projects. If properly designed and exposed to the atmosphere, A709 grade 50 steel is suitable for many applications in the unpainted condition.