T/CSEA 7-2019 Screw drill bit rotor plating technical specification

Scope

Scope: This standard specifies the requirements for the electroplating of chromium on the rotors of screw drilling tools, including types, processes, inspection rules, inspection methods, and instruments. This standard applies to downhole screw drilling tools used in drilling, workover operations, and special operations. Main technical content: 6.1 Appearance: The surface of the chromium plating layer should be a slightly bluish silver-white color with a metallic luster, without defects such as bubbling, peeling, chromium tumors, or pinholes. 6.2 Thickness: The thickness shall be measured according to the method specified in Clause 7.2. The chromium plating thickness on the rotor's helical groove is generally as follows: - At the large diameter of the rotor: greater than 0.10 mm; - At the small diameter of the rotor: greater than 0.04 mm. If the buyer has special requirements, they shall be implemented according to the buyer's requirements. 6.3 Hardness: The hardness of the plating layer shall be measured according to the method specified in Clause 7.3. The hardness of the plating layer shall be 850-1000 HV0.2. 6.4 Corrosion resistance: The corrosion resistance shall be measured according to the method specified in Clause 7.4. After a neutral salt spray test for 144 hours, the performance rating RP/RA shall be ≥9/9 vs. B. 6.5 Bonding strength: The bonding strength between the plating layer and the substrate shall not separate, peel off, or fall off. 6.6 Wear resistance: The wear amount of the plating layer shall be less than 0.25 g. 6.7 Roughness: The roughness shall comply with the requirements specified in Clause 5.5 of SY/T 5383. The helical surface of the rotor shall be polished, and the surface roughness before and after chromium plating shall be Ra≤0.8 μm.

Development Information

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