Non-magnetic steel is a kind of steel functional material, that is, a low-magnetic steel material that basically does not produce magnetic induction under the action of a magnetic field.

The room temperature structure of non-magnetic steel requires a stable austenite metallographic structure: precipitation hardened austenitic stainless steel.

This is because ferrite, pearlite and martensite structures are ferromagnetic at room temperature, and show strong magnetization in a magnetic field, and have high magnetic permeability. Austenite with a face-centered cubic structure is paramagnetic and has a very low magnetic permeability. By appropriately adding alloying elements to expand the austenite zone in the Fe-℃ alloy phase diagram and heat treatment methods (1060℃ solution treatment, quenching) 450-550℃ low-temperature forging, a stable single-phase austenite structure can be obtained at room temperature, thereby keeping the magnetic permeability of the steel material at a low level.

P530 is usually used in the coal gas layer industry to produce non-magnetic probes, drill pipes, spiral drill pipes, etc. In the oil and gas field industry, it is usually used to produce non-magnetic drill collars, non-magnetic heavy weight drill pipes, non-magnetic flow coupling, non-magnetic while drilling measurement instrument housings, non-magnetic flanges, etc.