In the traditional quality optimization process of stamping parts, the optimization is mainly through mold adjustment so that the time and quality costs are both higher. With the early vendor involvement (EVI) of professional quality management, the computer aided engineering (CAE) analysis technology is gradually applied in the simulation of stamping automobile parts. In the paper, it is introduced the self-owned material card of Baotou Steel is successfully developed by correctly selecting such characteristic parameters as typical representative performances and yield criterion through taking the DX53D+Z product as an example as well as the research on reliability of material card is completed by the analysis on forming property of products in the Autoform software. It is verified that the self-owned material card of Baotou Steel is with higher reliability and the database of simulation material could provide data support for EVI service.

The optimum pickling process parameters are studied through analyzing the effects of pickling process before phosphating on the quality of phosphating film and phosphating time on the premise of without changing process route aiming at the problems of discontinuous phosphating film and poor adhesive force on the surface of 25CrMo44 alloy steel. The optimum pickling process parameters are that the concentration of pickling solution is 90~110 points, pickling temperature is 40~60 ℃ and pickling time is 10~16 min., the phosphating film generated under this condition is compact, uniform and continuous as well as the adhesive force is qualified.

The analysis of chemical components for galvanized plate matrix as well as detection of plating thickness and weight could be completed simultaneously with the glow discharge optical emission spectrometry. The optimal determination conditions are selected and lower limits of determination for each analytical element are determined by comparing and analyzing the results with different electrode sizes, discharge conditions, measured pressure and power; the analytical method for determining matrix composition, plating thickness and weight of galvanized plate is established through comparison of analytical methods as well as precision and accuracy tests.

During the process of producing welding wire with BGER60Ti-1 welding wire steel, there is drawing fracture and faint yellow hard block phase is found to be direct cause through metallographic analysis of fracture sample. It is obtained according to formation mechanism of the microstructure that the faint yellow hard block phase is mixture of bainite and martensite. In the paper, such measures as extending holding time of wire rod and improving heat-retaining capacity of temperature holding hood are proposed based on studying from the perspective of controlled cooling after rolling. There is not any hard block phase in the improved matrix structure so that the problem of fracture of wire for BGER60Ti-1 welding wire steel is solved.

The armco iron is low carbon steel with such characteristics as soft texture, high toughness and good ductility. The cracks, bending and defects of appearance are easy to occur when rolling flat steel of electrode with armco iron as raw material. Such product defects as dimensional accuracy and cracks for flat steel of electrode are effectively controlled by such measures as improving heating system, optimizing pass and rolling route so that the stable production of products with armco iron is realized.

In order to meet the requirements of carbon equivalent and low temperature toughness, the chemical composition of low temperature Q355C hot rolled H beam for steel structure is designed and reasonable process route is formulated according to the functions of Nb element in steel as well as the mechanical properties of test steel are analyzed based on industrial production data. The test results showed that the yield strength of test steel was 355~465 MPa, tensile strength was stabilized at 525~620 MPa, elongation after fracture was stabilized at over 22% and low temperature impact energy at 0 ℃ was stabilized at 60~160 J by adding Nb element. Finally, the low temperature Q355C hot rolled H beam for steel structure mainly with ferrite and pearlite is obtained as well as all the properties of product could meet standard requirements.

The longitudinal crack is the main defect of Q235B steel belt manufactured by CSP production line of CSP Plant. Such measures as restore the accuracy of associated equipment, reasonably use casting powder as well as improve temperature difference of water inlet and outlet for crystallizer are summarized through the correlation analysis of process control points causing longitudinal crack by analyzing the causes of longitudinal crack for hot rolled steel belt combining with the actual situation of CSP production line. As a result, the longitudinal crack defect rate of Q235B steel belt is effectively reduced and qualified rate of hot rolled steel belt is improved.

In this paper, it is introduced the working principle and technical parameters of regenerative heating furnace in 1^# production line of Long Products Plant, analyzed the characteristics of heat input and output of regenerative heating furnace and ordinary heating furnace, obtained heat balance table and heat efficiency by calculation as well as analyzed the factors affecting heat input and output. Such measures as improving temperature of hot charging and hot delivery of billet and hot charging rate, decreasing temperature of billet out of furnace, using optimal air fuel ratio, reasonably setting commutation cycle, strengthening heat exchange effect in furnace, improving heat exchange efficiency and strictly controlling furnace pressure of regenerative heating furnace are proposed, which are with guiding significances for energy saving and consumption reducing of regenerative heating furnace.

Inner Mongolia Baotou Steel Pipe Co., Ltd. owns the world's advanced production unit of seamless steel pipe as well as the main products are various hot rolled seamless steel pipes and piercing plug, the hot tool matched with piercing process of several hot rolling production lines are manufactured by the company itself. The causal chain analysis is carried out aiming at the existing problem of low yield for casting piercing plug. The process of casting system for piercing plug is optimized through taking such scheme as increasing the porous sand core of riser manufactured by exothermic materials, installing weighing device and injection of nitrogen at the bottom of moulding flask so that the above technical problem is solved.

Phosphating and silane treatments are the common surface pretreatment technologies for cold rolled sheet. In this paper, the two conversion coating technologies are compared and analyzed from such aspects as the process flow, mechanism of film formation and evaluation methods as well as the morphologies of the two conversion coatings are compared and analyzed by scanning electron microscopy. Moreover, the influences of pretreatment technology on the surface roughness and peak density of cold rolled automobile steel DC04 are studied. The results showed that the surface conditioning and double washes after phosphating were omitted for silane treatment process compared with phosphating process as well as process flow was short and environmental; the mode of phosphate precipitation was adopted for film formation of phosphating, while covalent bond was adopted for film formation of silane treatment. Since the phosphating phase is crystal structure, so its phase composition and proportion could be evaluated by X-ray diffractometer. The phosphating film is composed of phosphate of 2~4 μm, while silane film is composed of finer round or irregular particles analyzed by scanning electron microscopy. After phosphating or silane treatment, the surface roughness of sample of cold rolled sheet DC04 remains unchanged, but peak density is increased slightly.