Non-magnetic Rod Material

I. Commonly used materials

1. P530 non-magnetic stainless steel: It is a high manganese chromium nitrogen (Mn-Cr-N) non-magnetic steel with a carbon content of ≤ 0.05%, manganese content of 18.5-20.0%, and chromium content of 13.0-14.0%. Its relative magnetic permeability μr<1.005, with high strength, good toughness, and resistance to stress corrosion cracking.

2. P550 non-magnetic steel: It belongs to the high manganese, high chromium, and high nitrogen nickel non-magnetic steel series, containing 20.5% -21.6% manganese, ≥ 1.4% nickel, 18.3% -20.0% chromium and other elements. It has the characteristics of stable structure, excellent mechanical properties, and low magnetic permeability.

3. P650 non-magnetic steel: It is a high MnALV non-magnetic steel with a chemical composition similar to P550. The carbon content is ≤ 0.06%, and the manganese, nickel, and chromium contents are 20.5% -21.6%, ≥ 1.4%, and 18.3% -20.0%, respectively. It has low magnetic permeability and high electrical resistivity, with minimal eddy current losses in a magnetic field.

II. Performance characteristics

1. Non magnetic: This is its key characteristic, which can maintain stability in strong magnetic field environments such as oil drilling, without interfering with the normal operation of magnetic measuring instruments, ensuring the accuracy of drilling parameter measurement.

2. High strength and wear resistance: With high strength and good wear resistance, it can withstand high pressure, high torque, and friction during oil drilling, ensuring the service life of mechanical parts.

3. Organizational stability: Under different temperature and pressure conditions, non-magnetic rod material can maintain a stable organizational structure, thereby ensuring the stability of mechanical properties and meeting the working requirements of petroleum machinery in complex downhole environments.

III. Processing technology

Due to the cold work hardening phenomenon of high manganese steel, cutting non-magnetic bar materials is relatively difficult. It is usually necessary to use high-temperature annealing process to change the particle size, shape and distribution of carbides, in order to improve their cutting performance and facilitate subsequent processing into various petroleum machinery parts.

IV. Application field

Non magnetic rod material is mainly used for manufacturing large and medium-sized pressure bearing drill rods, weighted drill rods, non-magnetic drill collars and other components in petroleum machinery. These components play a role in transmitting power, applying drilling pressure, and measuring wellbore parameters in oil drilling. The characteristics of non-magnetic rod materials help reduce downhole friction, improve operational safety, and enhance the accuracy of directional well parameter control.