Shanxi Zhonghe's non-magnetic drill collars have strict personnel and standards to control each step in the production process to ensure that the annual output of non-magnetic steel is 5000 tons, and each of about 2500 non-magnetic drill collars is a fully qualified product throughout the year.

Zhonghe selects high-quality raw material suppliers with complete quality to provide pure iron and non-magnetic raw materials with excellent and stable quality. The 8-ton induction furnace is used for smelting and adjusting control components. The spectrometer is qualified and transferred to the 8-ton AOD refining furnace. The steel composition and molten steel purity are improved on the refining furnace. After the electrode blank is poured, the secondary refining stage is entered. The electroslag remelting is carried out in the electroslag furnace to further improve the purity of nonmagnetic steel and ensure the final quality, the permeability of the material is less than 1.005 or less to form a non-magnetic forging blank with qualified composition.
The non-magnetic forging blank is transferred to the forging process stage and forged by an Austrian 1800-ton forging machine, which can process forging materials with an outer diameter of 90mm --- 300mm. The forging frequency of the diameter forging machine is up to 288 times per minute, which can ensure the overall consistency of the material and the uniformity of mechanical properties. The forged material has a very high overall surface finish.

Non-magnetic forging materials enter the inspection process of special special management by special personnel. API SPEC 7-1 is taken as the standard. After appearance inspection and ultrasonic flaw detection, the sample pieces are sawn to the corresponding experimental test room respectively. The yield strength, tensile strength, impact energy, magnetic permeability, metallography, hardness, intergranular corrosion and other material properties are repeatedly inspected at multiple positions to obtain the most reliable performance data. Select qualified and high-quality non-magnetic forging materials and transfer them to the machine workshop for processing.

The machining workshop straightens, deep hole processing, floating boring of inner hole, cold rolling, polishing after excircle processing, and straightening of finished products again, numerical control pipe thread processing and cold rolling of threads. The quality inspection department began to conduct a comprehensive inspection of the non-magnetic drill collar after machining, and has a complete set of oil drill collar thread gauges and measuring tools to measure and record the thread tooth height and tight distance according to the API7-2 requirements. Personnel holding UT Ultrasonic Nondestructive Testing Class II Certificate shall carry out ultrasonic flaw detection and coloring penetration flaw detection for the whole non-magnetic drill collar. After the director of the quality inspection department makes a comprehensive judgment on the product inspection data, the non-magnetic drill collar can only be packaged with colored strip cloth and steel frame. The quality inspection department synchronously produces the corresponding non-magnetic steel product quality certificate, and the product is shipped to the destination together with the certificate.

Shanxi Zhonghe in the non-magnetic drill collar production process from smelting to finished products, by the circulation card tracking the whole process, signed by the relevant responsible person transfer. In order to trace the production and machining process omissions. and traceability of product quality. Shanxi Zhonghe has a special person to strictly control every step of product processing, inspection and circulation, so as to ensure that the products delivered to customers are perfectly in line with all the needs of customers. Zhonghe regards product quality as the life of the enterprise and treats the products meticulously in order to win the trust of customers!