Dalian Steel for the first time trial of the French drill collars manufacturers Vallourec Mannesmann sulfur 4145H · drill collar steel to succeed, and in January successfully sent to the user. Vallourec is ITC's newly developed client, the trial is successful, not only of great significance to Dalian Steel in the drill collar steel field development, but also for the ITC companies to open foreign markets related industries has taken a solid step forward.
Production difficulties in the steel is quenched, it requires both surface hardness, but also requires mechanical properties. In Dalian Steel and Steel Institute staff systematically analyze and plan, to existing quenching process to make adjustments so that the surface hardness and mechanical properties of the product meet customer requirements. casing and tubing coupling Vallourec company's technical staff to Dalian production base for the current month warehousing 4145H acceptance, respectively dimensions, flatness, hardness testing and other by-branch inspection, all test items are one-time inspection. This batch of customers satisfied with the test results of steel, and expressed willingness to cooperate in the long-term future.