In this paper, the practice on increasing production and reducing consumption for 8^# blast furnace of Baotou Steel is summarized. The blast furnace operation and inner profile are gradually rational through such measures as strengthening management of raw fuel, adjusting upper and lower parts, optimizing blast furnace operation, increasing top pressure, blast temperature and coal ratio, enhancing process control, personnel training and equipment management as well as reducing delay ratio so that the technological and economic indicators of blast furnace are improved. In the first half year of 2020, the utilization coefficient of blast furnace reached 2.205 t/(m³·d) and the fuel ratio was 548 kg/t.

In this paper, the practice on reducing cost of pig iron for 4 150 m³ blast furnace of Baotou Steel is summarized. The main technological and economic indicators of blast furnace are improved as well as the cost of pig iron is reduced by such measures as strengthening the management of raw fuel into furnace, improving the level of blast furnace operation, maintaining the furnace condition stable and trouble-free, strengthening cost management and other management levels as well as optimizing manufacturing technique. The cost of pig iron in the first half year of 2019 was reduced by RMB 88.1 Yuan per ton of iron compared with that of the corresponding period of 2018.

The Bi-PCI technology is with such characteristics a s improving the air permeability of stock column for blast furnace, protecting the internal organizational structure of coke in furnace, increasing the usage amount of pulverized coal and enhancing the smelting strength of blast furnace. The industrial test of the process has been carried out for 4 150 m³ blast furnace of Baotou Steel for one and a half months. The results of systematic study on important parameters of blast furnace, microstructure and drum strength of coke at tuyere showed that the technical and economic indicator of blast furnace could be effectively improved as well as the deterioration of coke in furnace could be restrained with the Bi-PCI process.

In this paper, it is introduced the application and implementation of the technology of recycling high temperature flue gas of big flue for two 500 m² sintering machines of Baotou Steel as well as the technical problems existing in production practice. The solutions are proposed by analyzing the production parameters and field conditions combining with the operations, which can be as references for maintaining other similar associated equipment. The waste heat recovery is realized and unit process energy consumption in sinter production is reduced while guaranteeing the production to be trouble－free.

IOC6 mineral powder is with such characteristics as dense particles and difficult to produce liquid phase during sintering. It forms a complementary relationship with the characteristics of iron concentrate of Bayan Obo that it is easy to form liquid phase during sintering process. The experimental research showed that the production and quality indicators of sintering of Baotou Steel could be improved by adding 10% IOC6 mineral powder instead of PB powder with a large proportion of iron concentrate of Bayan Obo.

In this paper, the new production technologies for oriented silicon steel in industry in recent years are summarized, seven of them including thin slab casting and rolling technology, refining magnetic domain, asynchronous rolling, increasing content of Si, replacing monomer cover annealing with tunnel continuous high temperature cover annealing, thinning thickness and double oriented silicon steel are introduced. With these new production processes, the magnetic induction intensity can be improved, iron loss and such magnetic characteristic as coercivity can be reduced as well as the effects of high efficiency, energy conservation and cost reduction are good.

Since the production line of 4 100 mm wide and thick plate of Baotou Steel was put into production, the roll consumption has been higher and the cost of per ton of steel has been increased due to such problems as stock removal, changes of steel grade and specification as well as accident and equipment status of rolling mill. The service efficiency of roll is improved and roll consumption is reduced by taking such measures as controlling stock removal, optimizing production scheduling, reducing abnormal roll change caused by accidents and perfecting rolling mill.

In this paper, it is expounded that the specification of product produced by the high-level modern continuous pickling line of hot-rolled plate is (1.2~8.0) mm ×(800~1 680) mm and the strength is 780 MPa. In the process of hot rolling to pickling, the influences of scale and pickling process on the surface of steel belt are analyzed and studied through laboratory and field experiments so that the problem of blackening on surface of pickling steel belt is improved.

The steel grade for BT110TS special casing highly resistant to collapse and hydrogen sulfide corrosion designed in the article is 26CrMoVNbRE, the small-batch trial production is with converter smelting, LF refining, VD vacuum treatment, continuous casting of round billet, heating with annular furnace, piercing with cone roll piercing mill, PQF tandem rolling, stretch reducing, quenched and tempered process as well as the outer diameter and wall thickness, mechanical properties, microstructure, residual stress, collapse resistance and SSC hydrogen sulfide corrosion resistance of casing are detected. All the indicators could meet the technical requirements, the recommended value of standard for collapse resistance was over 38%, NACE 0177 standard A method was used, loading stress was 606 MPa, sample did not break after 720 h and surface of sample was smooth without cracks.

In this paper, it is elaborated the repair of rolling-mill housing in the production line of heavy rail with laser cladding technology on site of Rail and Beam Steel Rolling Plant of Baotou Steel in detail, tracking of recovery for accuracy of rolling mill after the repair as well as summarized the mature and stable scheme for recovering the accuracy of rolling-mill housing, which could lay the foundation for producing high-quality products.