Sumitomo Metal Industries Research Articles

SUMITOMO DP8

Abstract SUMITOMO DP8 is a duplex stainless steel. Duplex stainless steels are designed to be economical and reliable for material applications in the production of oil and gas to resist the environments there of carbon dioxide, hydrogen sulfide and chlorides. This family of alloys is also resistant to chloride-ion stress-corrosion cracking. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as heat treating and joining. Filing Code: SS-571. Producer or source: Sumitomo Metal Industries Ltd.

SUMITOMO DP3

Abstract SUMITOMO DP3 is a duplex steel with 25 chromium to resist the oil country tubular goods environments of hydrogen sulfide, chlorides and carbon dioxide. The higher alloying also produces higher strengths and more resistance to chloride stress-corrosion cracking than 22 chromium duplex stainless steel. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as heat treating and joining. Filing Code: SS-570. Producer or source: Sumitomo Metal Industries Ltd.

Automatic gauge control for heavy plate mill

Sumitomo Metal Industries Ltd has developed the new Automatic Gauge Control (AGC) for heavy plate mill in order to decrease the thickness deviation. For the AGC, the drafting schedule model was improved and new tracking method was developed. The new AGC has decreased the thickness deviation of plates by more than 50 % and thus has increased the yield by 0.5 % at the heavy plate mill at Kashima Steel Works.

J. Japan Soc, Powder and Powder Metallurgy: N. Hiraishi et al (Sumitomo Metal Industries Ltd, Amagasaki, Japan) Vol 39, No 10, 1992, 897–900. (In Japanese)

J. Japan Soc, Powder and Powder Metallurgy: N. Hiraishi et al (Sumitomo Metal Industries Ltd, Amagasaki, Japan) Vol 39, No 10, 1992, 897–900. (In Japanese)

Metal powder consolidated processes during hot extrusion of superalloy pipe products : Y. Ohashi et al (Sumitomo Metal Industries Co Ltd, Tokyo, Japan)

Metal powder consolidated processes during hot extrusion of superalloy pipe products : Y. Ohashi et al (Sumitomo Metal Industries Co Ltd, Tokyo, Japan)

Surface analysis of gas atomized nickel alloy powder and properties of compacted alloy : T. Fukuda et al (Sumitomo Metal Industries Ltd, Tokyo, Japan)

Surface analysis of gas atomized nickel alloy powder and properties of compacted alloy : T. Fukuda et al (Sumitomo Metal Industries Ltd, Tokyo, Japan)

Hydraulic screwdown control system for mandrel mill

A hydraulic screwdown control system for the mandrel mill was successfully installed at Wakayama Steel Works of Sumitomo Metal Industries, Ltd., in April, 1989. The purpose of the control is to shape the tube ends in a thin tapered form. By applying this screwdown control, it is possible to eliminate end thickening in the reducer and to reduce the length of crop losses. This screwdown control system must respond rapidly without position offset error. Therefore, the following functions of the screwdown servo control were applied: (1) velocity feedforward compensation, (2) position offset compensation, (3) hydraulic pressure feedback compensation, (4) adaptive function of screwdown start time, and (5) application of an expert system.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Heat resisting supporting member : Seguchi, M. and Okamura, K. (Sumitomo Metal Industries, Inc, Osaka, Japan) US Pat 4 906 525 (6 March 1990)

Heat resisting supporting member : Seguchi, M. and Okamura, K. (Sumitomo Metal Industries, Inc, Osaka, Japan) US Pat 4 906 525 (6 March 1990)

4959985 Method of manufacturing metallic tube with spiral fin : Kouichi Kuroda, Chihiro Hayashi, Kazuyuki Nakasuji, Amagasaki, Japan assigned to Sumitomo Metal Industries Ltd

4959985 Method of manufacturing metallic tube with spiral fin : Kouichi Kuroda, Chihiro Hayashi, Kazuyuki Nakasuji, Amagasaki, Japan assigned to Sumitomo Metal Industries Ltd

Simultaneous injection of pulverized coal and dolomite into blast furnace tuyeres.

For the simultaneous control of Si and S contents in pig iron, a simultaneous injection of pulverized coal and flux (dolomite in this research) into blast furnace tuyeres was proposed. Fundamental researches were performed on slag formation property, SiO gas generation reaction and transport properties of pulverized coal-dolomite mixture to investigate merits and presumed problems of simultaneous injection of pulverized coal and dolomite. The significant improvement of slag formation property and the suppression of SiO gas generation reaction were confirmed. Pressure drops in both horizontal and vertical transport pipelines were experimentally evaluated. Distribution characteristics to tuyeres and abrasion of transport pipeline of pulverized coal and dolomite mixture were found to be no problem for commercial application. Based on the fundamental researches, a commercial test operation with simultaneous injection of pulverized coal of 20 kg/THM and dolomite of up to 15 kg/THM were performed at Kokura No. 2 blast furnace, Sumitomo Metal Industries, Ltd., for 2 weeks. Si and S contents in pig iron were decreased through dolomite injection of 15 kg/THM by 0.06 and 0.005%, respectively. The increase of corrected coke rate of 6.2 kg/THM was obtained by dolomite injection of 15 kg/THM. No harmful change of inner furnace state was observed and the stable furnace operation can be expected with simultaneous injection of pulverized coal and dolomite.

4846884 Process for producing cold-bonded iron ore for use in a blast furnace: Tatsuhik Shigematsu, Minoru Ichidate, Chitose Shiotani, Yohzi Tozawa, Amagasaki, Japan assigned to Sumitomo Metal Industries Ltd

4846884 Process for producing cold-bonded iron ore for use in a blast furnace: Tatsuhik Shigematsu, Minoru Ichidate, Chitose Shiotani, Yohzi Tozawa, Amagasaki, Japan assigned to Sumitomo Metal Industries Ltd

A hybrid expert system combined with a mathematical model for blast furnace operation.

For the establishment of completely automatic and most intelligent control system, a hybrid expert system composed of both a mathematical model (the TS model) and experiential rules was developed as the application of artificial intelligence.The selection of control method either by the TS model or by experiential rules is appropriately performed by furnace state judgment rules which are actually experiential rules.In the normal furnace state, the control by the TS model is performed to minimize hot metal temperature for the reduction of energy cost. In the abnormal furnace state, the control by experiential rules is performed to achieve stable furnace operation for the prevention of significant reduction of hot metal production.Further, diagnosis rules are provided in the system to determine the cause of abnormality and to select necessary actions for the long term control. The necessary actions indicated by diagnosis rules are performed manually through the final decision of operators or staffs.The system was introduced into Kashima No. 1 blast furnace of Sumitomo Metal Industries, Ltd. in October of 1988. The hybrid expert system is successfully applied in actual short term control. The establishment of the complete diagnosis rule for long term control is one of the main future tasks of the system.

A new method for universal rolling of large H-beams from continuously cast slabs.

In the structual shape mill at Kashima Steel Works of Sumitomo Metal Industries, Ltd., all large H-beams ranging up to H900×300 and H500 ×500 have been produced by rolling 250-mm thick continuously cast slabs in one heat with a new split rolling method.Compared with the conventional rolling method which starts from ingots, the rolling yield has raised by 10% and the energy consumption has been significantly improved.

Mathematical Model of End Point Control for the Top and Bottom Blowing Process in BOF

For the endpoint control of the top and bottom blowing process in BOF, a simplified mathematical model which is suitable for the online application has been established by the following procedure.(1)The basic equations for the rates of oxygen consumption and temperature increase, which have the comprehensive characteristics in both the ranges of low and carbon high carbon contents, have been derived in the current work.(2) On the basis of the basic equations, the fundamental curves of oxygen consumption and temperature increase, which show the progress of blowing, have been determined by the analysis of the actual operational data. The fundamental curve of dephosphorization has also been determined in the same way.(3) A control model for the endpoint carbon content and the endpoint temperature of metal has been established by the use of the fundamental curves.At No. 2 BOF shop in Kashima Steel Works, Sumitomo Metal Industries, Ltd., the model is now being used for the automatic blowing and contributes to the reduction of reblow ratio and furnace refractories.

高炉における石炭の利用技術

This paper describes the present status of coal utilization in ironmaking.The two main processes of coal injection into blast furnace have been developed to save expensive metallurgical coke;1) The colloidal fuel mixture injection2) The pulverized coal injection (PCI)The development of the former process, that is coal oil mixture (COM) and coal tar mixture (CTM) injection into blast furnace, was completed by Sumitomo Metal Industries and other Japanese steel works in 1982.As for the latter one, the first PCI equipment in Japan has been operated in Oita No.1 BF of Nippon Steel Corporation since 1981. It was successfully completed by modifing the ARMCO system. The number of blast furnace with PCI system operation has come up to sixteen in Japan, which implies remarkable development of the system.The present technology of coal utilization in iron and steel industry is focused on the development of both coal water mixture (CWM) injection into blast furnace and coal addition into steelmaking vessels.

Development of Hot Seamless Tube Wall Thickness Gauge by Electromagnetic Acoustic Transducer

An electromagnetic acoustic transducer gauge has been developed for the measurement of hot seamless steel tube wall thickness. The system consists of a tunnel type electromagnet which generates the strong axial magnetic field around the pipe, and 6 sensors including transmitting and receiving coils which are arranged between poles encircling the pipe. The gauge can measure the wall thickness of pipe at 6 circumferential points with the rate of 250Hz.The ultrasonic characteristics in hot steel such as velocity and sensitivity have been investigated. The measuring accuracy of the gauge has also been investigated in the laboratory and at the No. 1 tube making plant in the Kainan Steel Tube Works of Sumitomo Metal Industries, Ltd. The basic experiments showed that the ultrasonic velocity can be calculated by measuring the surface temperature, and that the sensitivity changes due to the change of air-gap and surface temperature can be compensated by AGC (automatic gain control) circuit.The system was positioned at the exit of finishing stand of stretch reducing mill, and pipes of various sizes (42.7mm-177.8mm dia.×3.2-25mm thickness) were rolled to measure the wall thickness. The results showed that the measuring accuracy was less than ±0.1mm.

The Quality Control System of Sintering Plant at Kashima Steel Works

In recent years, the quality control of sintered ore has become more and more important for stable operation of modern blast furnaces where the sinter ratio of feedstock material exceeds 50%.The quality control system of sintering plant has been developed by SMI (Sumitomo Metal Industries, Ltd.), which consists of the measurement systems of free carbon and FeO content in raw materials, the control system of particle distribution of crushed coke and the FeO content in sintered ore.It's well known that the conventional batch sampling method has such limitations for quality control of sintered ore as its poor sampling frequency and time lag before result is acquired. In the past several years, SMI has developed the sensors and control system of sintered ore with satisfactory results. Our research in those several years, the following results are attained. (1)There is close relation between indices of ROI (Reduction and Disintegration Index) and TI (Tumbler Index) of sintered products and the ratio of smaller particle size of crushed coke than 1 mm.(2)FeO content of products is controllable by regulating the coke ratio in relation to the FeD content of raw materials and products.(3)FeO content can be controlled more accurately by regulating the coke ratio in which the effect of free carbon content of raw materials is corrected.From those facts, the following measurement systems are developed. (1)Continuous FeO measurement meter for raw materials ----- The principle of FeD measurement meter consists in inductance change of detecting coil by the FeD content of raw materials.(2)Continuous FeO measurement meter for sintered products.(3)Particle distribution measurement system of crushed coke ----- This system uses an optical pattern recognition method.(4)Free carbon content measurement system of raw materials ----- This system estimates the total carbon consumption by calculating the data of flue gas volume and components.The recent operation has obtained the changing the desired value of ROI from 40% to 42% as a result of the improvement of control accuracy, so the FeD and SiD 2 content of products can be cut down more than 0.7% which bring about much cost-down of products.

A Mathematical Model of Blast Furnace for Control of Hot Metal Temperature

For the automatic control of hot metal temperature, a new simplified mathematical model of blast furnace has been developed on the following assumptions:(1) The working volume in the furnace is divided into five horizontal zones. Only the specified materials and reactions are considered in each zone.(2) By taking material balance, the flow rates of solid and gas at each zone are determined so that the amount of the material existed in each zone remains constant.(3) Heat balance is applied to solid and gas in each zone, respectively, taking account of their average temperature.(4) The reaction rates are formulated as the functions of operational variables on the basis of their step response characteristics.The temperature of solid and gas at each zone can be predicted by the adjustment of parameters in the model using actual operational data. Since the predicted solid temperature at the fifth zone (tuyere level) agrees well with the actual hot metal temperature, the validity of the model has been proved.At Kokura No. 2 BF, Sumitomo Metal Industries, Ltd., the model is being used for the automatic control and contributes to the stable blast furnace operation.

The Present Situation and A Plan for Future of Office Automation in Sumitomo Metal Industries, Ltd.

The Present Situation and A Plan for Future of Office Automation in Sumitomo Metal Industries, Ltd.

Maintenance information system for Wakayama Steel Works, Sumitomo Metal Industries, Ltd.

Wakayama Steel Works, Sumitomo Metal Industries, Ltd., developed the “On-line Maintenance Information Control System (MICS)” in Oct., 1980. The real time information of maintenance work planning, plant histories, spare parts inventories, etc., available from this computer system made more effective maintenance possible.This paper presented explains how the system was developed and the results of its application.