The process of rolling the TC4 titanium alloy tube blank with the PQF rolling mill, Accu rolling mill and Assel rolling mill was simulated by ABAQUS simulation software as well as the changes of section form, temperature, stress and strain in rolling process were analyzed. The results showed that the change of section form in the process of rolling TC4 seamless tube with PQF rolling mill was smaller than that in the process of rolling TC4 seamless tube with Accu and Assel rolling mills as well as the dimension precision was higher; the stress distribution in the rolling process with Accu and Assel rolling mills was more complicated than that in the rolling process with PQF rolling mill; the metal strain of inside wall thickness was larger than that of outside wall thickness when the three rolling routes were adopted; the temperature reduction with Accu and Assel rolling mills was smaller than that with PQF rolling mill because of the short rolling time.

In the paper, the influencing factors and control main points of resistance to hydrogen sulfide corrosion are mainly described. The hydrogen sulfide stress corrosion resistant casing with independent intellectual property rights is produced combining with the production practices of Baotou Steel, which is with good resistance to H₂S corrosion. It is proved after being used that the product performances are good and can reach the level of domestic like products.

In this paper, the phase transition points of test steel and continuous cooling transformation (CCT) curve of supercooled austenite were determined with the FORMASTOR-F full automatic phase transformation instrument as well as the microstructure of specimen processed at different cooling rates was analyzed with the Zeiss microscope by taking the 3Cr corrosion resistant oil well pipe steel as the object of study. The experimental results showed that the phase transition points of 3Cr corrosion resistant oil well pipe steel A_c1 was 730 ℃ and A_c3 was 830 ℃. When the cooling rate was at 0.1~0.5 ℃/s, the microstructure at room temperature was proeutectoid ferrite + bainite, when the cooling rate was at 0.5~0.8 ℃/s, the microstructure at room temperature was ferrite + bainite + martensite, when the cooling rate was at 1~3 ℃/s, the microstructure was mixed martensite + bainite and the martensite structure was obtained when the cooling rate was greater than 3 ℃/s.

In the paper, it is introduced the special properties of S135 grade petroleum drill pipe body steel produced by Baotou Steel have been studied in the laboratory. The results showed that it was with good low temperature impact toughness and the average impact energy could reach above 80 J when the temperature was-70 ℃; its average torsional strength was 920 MPa, fatigue limit stress of rotating bending was 462 MPa, average spreading rates of fatigue crack were 8.4 ×10^-6 mm/cycle and 19. 7 × 10^-6 mm/cycle as well as the opening displacement of crack tip was 0.181 mm.

In the paper, the high-strength and high-toughness perforating barrel produced with quenching and tempering by Baotou Steel is introduced. Its development and effects are summarized through the design of steel grade, heat treatment process test and actual productions. The results show that its strength can reach 150KSI level, transverse impact toughness is good so that it is with high-strength and high-toughness performance after the appropriate heat treatment process.

The traditional manual accounting mode has been adopted in the point inspection work of Steel Tube Co. for a long time. Based on this, the R&D for intelligent information point inspection platform has been put forward by Steel Tube Co.. The overall goals are to promote enterprise management innovation, optimize management mode, implement business process reengineering and establish a modern equipment operation management system by means of the advanced information technology with informatization so that the equipment operations are transmitted timely and accurately through the network as well as duplicate entry of the same data source is reduced. As a result, the equipment operation data are accurate, timely and sharable.

In the paper, it is introduced the information sharing platform for factory through field constructed with the MES-ERP system of Steel Tube Co. of Baotou Steel, based on operating the VMI vendor management system in oilfield and the cloud services are as medium, with which the wastes of manpower and material resources caused by manual data input for updating quality parameters of oilfield are reduced as well as the manufacturer, Steel Tube Co. can also obtain the feedback information of product use first time. Moreover, the use ratio of information resources is improved, information transfer is accelerated, waste of resources in collecting, storing and transferring information is avoided so that the efficiency is greatly improved.

The servo valve is the core control element of hydraulic cylinder control system (HCCS), the computer system implemented the closed-loop control is the main control mechanism of HCCS and the D791 servo valve itself used for rolling mill is the control valve with closed-loop control. In the paper, the working principles of MOOG D791 servo valve are introduced as well as the control characteristics of its flow and its dynamic properties are analyzed. The feedback signals of spool displacement for servo valve could be seen with the simulated program as well as the superiority and inferiority for its working performances could be judged through the following features curve of feedback values and set values in the whole motion process of servo valve.

In the paper, the problems of short service life for support stand of mandril as well as the abnormal steel tube wall thickness quality accuracy and surface abrasion of mandril caused by misalignment of mandril are solved with such measures as adjustable pull rod and bent axle of roller based on the working principles of support stand for mandril of PQF rolling mill. As a result, the service life of thermal deformation tool is increased and the consumption of mandril is reduced greatly, which is with certain guiding function for actual productions.

The ABB ACS6000SD medium-inverter control system is used in Φ460 mm production line of Steel Tube Co. of Baotou Steel. The system is equipped with two sets of water cooling units to dissipate heat of electrical elements in the cabinet through heat exchange. Parameters such as the inner ring water temperature and conductivity of water cooling system as well as water pressure are very important to the normal operations of the whole system. In this paper, the key maintenance points as well as the faults and solutions in operations are discussed and summarized through analyzing the control principles of water cooling system.