Krupp? Thyssen Stainless Steel Company was established in 1995, and Krupp was established in 1997 by merging stainless steel flat products produced by Krupp and Thyssen. Thyssen stainless steel company. Subsequently, it successively purchased 90% equity of Italian Torni Special Steel Company (AST), controlled Mexican Stainless Steel Company (Mexinox), 1997, and established Shanghai Krupp Stainless Steel Company (SKS) with China Shanghai Pudong Iron and Steel Group Company.
Krupp at present? Thyssen Stainless Steel Company's annual production capacity in Italy AST Company is 6.5438+0.3 million tons, the other four main subsidiaries' annual production capacity of crude steel is 6.5438+0.9 million tons, and the total production capacity of cold-rolled stainless steel flat products is 6.5438+0.65 million tons, which makes Krupp? Thyssen Stainless Steel Company has become the largest stainless steel producer in the world, and its flat steel products account for about 37% of the European market share and 65,438+05% of the world market share. Under the impact of the wave of mergers and acquisitions of global steel enterprises, Krupp? Thyssen Stainless Steel Co., Ltd. maintains its position as the world's leading flat stainless steel product and its existing market share, and cooperates with newly merged and reorganized companies such as Uzzinor Company and Avista Company. Polaroid, Arcelinox and other competitors, the company has adopted a series of strategies, such as expanding production capacity, adopting advanced technology, paying attention to product structure adjustment and improving service to users. AST, a 90% holding subsidiary of Italy, is a stainless steel and electrical steel manufacturer with the whole process of smelting, continuous casting, hot rolling and cold rolling. The second factory of AOD has been put into production, a thin slab caster has also been put into production, and the fifth rolling mill of Sendzimir and a new bright annealing production line have also been put into production. All these have obviously improved the stainless steel production capacity of Astorni Plant. The annual production capacity of stainless steel hot rolled strip will be increased to 650,000 tons, and the total output is expected to reach 6,543,800+500,000 tons in 2003.
Besides Krupp? Thyssen Stainless Steel Co., Ltd. is seeking to establish a factory in the United States or seek new partners to ensure the supply of the whole North American Free Trade Area with its subsidiary Mexican Stainless Steel Company. At present, the sales volume in NAFTA accounts for Krupp? The total sales volume of Thyssen Stainless Steel Company is 15%. The cold rolling plant of Mexican Stainless Steel Company has an annual production capacity of 220,000 tons and now supplies more than half of the output to the United States. North America is an attractive market. Krupp? In the same strategy, China, the predecessor of Thyssen Stainless Steel Company, and Shanghai Pudong Iron and Steel Company of Baosteel Group established Shanghai Krupp Stainless Steel Joint Venture. The company is a full-process stainless steel flat steel product manufacturer with an annual output of 500,000 tons of crude steel. The first phase of the project was put into production on 200 1+0 1, with an annual output of 72,000 tons of bright plates.
Krefeld factory, Tennier factory, Bochum factory. The characteristics of its technological process can be summarized as follows:
① All processes from smelting, continuous casting, hot rolling to cold rolling are integrated, and two-step and three-step steelmaking processes play a key role in improving steel quality and reducing costs.
② The newly-built CSP thin slab caster in Tennier Plant has a slab thickness of 60mm in advance, and then it is rolled into hot rolled strip with a thickness of 2 ~ 6mm on-line by using the existing hot rolling mill. In addition, the new annealing and pickling line will adjust the imbalance between rolling and annealing and pickling capacity, thus increasing the output of cold-rolled strip steel to about 80,000 tons/year, which is the highest among similar production lines.
(3) krefeld Plant is considering the fifth cold rolling plant, with an additional capacity of 6,543.8+0.5 million tons/year to match the new local annealing pickling line. '
4 Krupp? Thyssen Stainless Steel Co., Ltd. strives to provide every customer with high-quality flat steel products with specifications, sizes and quantities that meet customer requirements. The largest stainless steel service center in Europe will be built in Creveld to complete and further process stainless steel.
Krupp? Thyssen Stainless Steel Company's main products are austenitic stainless steel hot-rolled pickling plates and cold-rolled coils with various surface states, ferritic stainless steel hot-rolled coils with pickling and thick austenitic stainless steel cold-rolled coils.
2. Arcelor Company
Eugenol, founded in 1948, is the largest integrated iron and steel enterprise in France, which was formed by the merger of Usinor and Sacilor. By optimizing the company's management, rationally organizing production and utilizing resources, the company's competitiveness has been greatly improved. In 1980s, Yuzinol invested billions of dollars to expand its factory and equipment, and established itself as an important supplier of flat rolled products in European automobile industry and the largest stainless steel producer in Europe. After the privatization of 1995, the company began the grand plan of international investment expansion. From 1997 to 1998, the company made a series of overseas investments in stainless steel business. 1998, Unocal acquired the controlling stake of Acesita in Brazil, making it a subsidiary of Unocal. In 2000, Ascetta Company produced 300,000 tons of stainless steel plates every year, 50% of which were exported to North America and Europe. The company plans to invest $654.38+800 million in 2002, increase the steelmaking capacity from the current 350,000 tons to 500,000 tons, change the converter into an AOD furnace, increase the output of electric furnaces and stop the production of carbon steel. 19981February, Yuqinuo Company acquired 53.5% equity of J & L(joesandlaughan)53.5%), the largest stainless steel manufacturer in the United States in the 1980s, and held it. Subsequently, the company merged with Albeid Group, which led to the merger of Belgian Al (ALZ) Company, a professional stainless steel manufacturer under Albeid Group, with the company. Subsequently, Uzzinol merged with the French company UgineSA to form a new group Arcelor. At present, the annual output of stainless steel in ALZ Company is about 600,000 tons, which is one of the few factories in the world that can produce stainless steel coils with a width of 2,000 mm. In 2000, Albert Group invested 65.438+66 billion euros in ALZ Company, added No.2 electric furnace, reformed refining and continuous casting equipment, and built No.4 annealing and pickling production line, so that its annual output increased to 65.438+02 million tons in 2002. In this way, after the completion of the reconstruction and expansion, the total stainless steel output of Arcelor Group will exceed Krupp? Thyssen Stainless Steel Company (KTS) ranks first in the world. In addition, Youjina Company is also the largest foreign investor of Thailand THAINOX Stainless Steel Company.
Examples of production processes of Arcelor and its five holding stainless steel subsidiaries are as follows:
(1)1In March, 1999, the world's latest compact continuous cold-rolling annealing pickling line was built in Hisbergues factory, with an annual production capacity of 250,000-270,000 tons, and the product is (0.8)1.0-4 mm x700-1600 mm cold-rolled stainless steel strip. The production line can process hot-rolled stainless steel coil into cold-rolled stainless steel strip in only one step, which shortens the working procedure and reduces the cost.
(2) ALZ Company adopts three-step smelting process. After continuous hot rolling (external processing), two sets of cold rolling are carried out in our factory, followed by annealing, pickling and finishing.
③ALZ has the only main production line in the world that can produce cold-rolled stainless steel coils with a width of 2000 mm and a thickness of 8mlTl, and it is also one of the few enterprises in the world that can produce hot-rolled stainless steel coils with a width of 2000 mm. ..
(4)J&L Company, like Hisbergues Factory, is an earlier manufacturer of compact continuous cold-rolling annealing pickling line, with an annual output of 250,000 tons of cold-rolled stainless steel coils.
Yuqinuoer's stainless steel products mainly include bloom, billet, slab, hot rolled strip, hot rolled annealed and pickled coil, cold rolled coil, bright annealed coil, wire rod, round steel and bright bar.
3. Avista? Borarit Corp.
Avista? Borarit was founded in September 2000 by Avista? Avesta-sheffield and Outokumpu in Finland are newly established world-class multinational stainless steel companies. At present, the production capacity of stainless steel plate is about1700,000 tons, and its plate products account for 13% of the global market share, with sales exceeding 3 billion euros.
After the establishment of the new company, a series of structural adjustments have been made to subordinate factories in several countries, and a large number of new projects have been invested, with a total investment of 660 million euros. Among them, a new slab caster with an annual output of 800,000 tons (slab size:170mx800 ~1650mm) was built in Tornia, Finland, and equipped with an online high-temperature slab grinding device at 800℃. After it was put into production in June 2002, the steelmaking capacity reached 1 10,000 tons. In addition, the factory has also built an integrated production line for hot-rolled and cold-rolled stainless steel, with an annual production capacity of 65,438+0,654,380+ten thousand tons, which can directly produce cold-rolled stainless steel and hot-rolled stainless bamboo shoots. Trial production is planned for 2003. In terms of structural adjustment, it is planned to close the smelting and hot rolling production equipment of Degerford plant in Sweden in 2003, leaving only cold rolling and medium plate production, and transfer the output of large and small billets from this plant to Sheffield plant in England. After such adjustment and expansion, Avista? Borarit's stainless steel production capacity will increase to 3 million tons. It can not only produce austenitic cold-rolled and hot-rolled strip steel and thin plate, but also supply stainless steel medium plate, welded pipe, bar wire and precision strip steel. The product sales network covers the whole world.
The company has two smelting workshops in Ruidian and England, which are smelted by electric furnace, refined by AOD or CLU device, and continuously cast into slabs by continuous caster. Slabs of the whole company are sent to the modern steckel mill in Avista, Sweden for hot rolling, and then returned to the cold rolling workshops of various factories. The company's factory in Tornia, Finland has the only full-process stainless steel production process in the world: finished products.
The above process flow can be summarized as follows:
① Avista Factory was transformed into the world's first continuous production line with the functions of cold rolling, pickling, annealing, flattening and coiling in 1992. The cold-rolled stainless steel strip produced by Avista Factory can be sold as finished products, and can also be used as raw materials for rolling stainless steel sheets of various specifications.
(2) The stainless steel production in Tornia begins with chromite mining, and then goes through electric furnace smelting, refining, continuous casting and rolling. This is the only complete technical route in the world. In addition, the newly-built hot-rolled and cold-rolled stainless steel strip production lines in the factory have been integrated.
4. Vinarino (Vinarino)
Acerinox company is the only full-process stainless steel manufacturer in Spain, which is affiliated to Pal-mones factory in Palmo, and was built in 197 1, becoming the main stainless steel manufacturer in Spain. Since the 1990s, Arcelinox has accelerated the expansion and transformation of its Palmo Ness factory, with an annual production capacity of 65,438+065,438+070,000 tons. On the other hand, the company expanded overseas and invested in stainless steel production. 196 A joint venture with Armco Company (each holding 50%) was established to build a cold-rolled stainless steel strip factory-North American Stainless Steel Company (NAS) in Carrollton, USA. After 1996 was put into production, cold-rolled stainless steel strip with the width of 1524 mm could be produced, and then steckel mill with the width of 1524mm was built. The production capacity of NAS company reached 1 10,000 tons. In recent years, Arcelinox has acquired 64% shares of 64% stainless steel company in South Africa. Through a series of expansion and transformation and marching abroad, Arcelinox's annual stainless steel output reaches 2.5 million tons, which is the same as Avista's? Polaroid Company ranks third in Europe.
The company's production process is as follows:
Palmos factory Carrollton factory Columbus factory
Arcelinox's stainless steel products are mainly plates, including 16-60mm× 158mm thick plate, 2.5- 15mm× 3000mm thick plate, 2.5- 15mm× 3000mm hot rolled coil, and 0.25- In addition, there are billets, flat steel, steel pipes and so on.
5. Posco Steel Company
South Korea's Pohang Iron and Steel Company is the world's largest steel producer, with an annual output of 25.57 million tons of crude steel from 65438 to 0998, replacing Nippon Steel Company of Japan as the world's largest crude steel producer for 30 years.
The products of the company used to be mainly plain carbon steel, but since 1980s, with the development of automobile industry, electronic industry and emerging industries, the steel market demand has developed in the direction of high-grade, multi-variety and small batch. Pohang Iron and Steel Company adjusted its product structure in time, and the proportion of high value-added products such as stainless steel coil, coated steel plate and automobile steel plate increased year by year. At the same time, the company invested in the construction of new smelting, continuous casting and rolling facilities in its Pohang plant, which is expected to be completed in 2003. The project includes the introduction of the third stainless steel smelting electric furnace, new continuous casting facilities, the installation of a new pickling and annealing production line and a new heat treatment furnace with a processing capacity of 200 tons/hour. The company said that in order to produce more stainless steel coils, it would expand the 1 hot tandem mill. After the completion of this project, the hot rolling capacity of Pohang Iron and Steel Company will increase by 450,000 tons, and the crude steel production capacity of stainless steel will increase from the current:1130,000 tons to166,000 tons, making it the second in the world after Krupp? The second largest stainless steel hot rolling plant after Thyssen Stainless Steel Company.
The products of Pohang Iron and Steel Company have strong competitiveness in the international market, which comes from low cost, high efficiency, good quality, reasonable product structure and meeting market demand. In order to further improve the status of its products in the world, the company directly invests abroad, produces locally and sells locally to obtain higher profits. By 1997, 25 wholly-owned and joint ventures have been established in the United States, China, Viet Nam, Indonesia and Thailand, and there are 9 joint ventures or wholly-owned companies in China, among which Zhangjiagang Posco Stainless Steel Company has 1998+0. June 5438+October 2002 10, Pohang Iron and Steel Co., Ltd. signed a contract with Qingdao Iron and Steel Group Co., Ltd. to jointly invest10.8 billion US dollars to build a joint venture project with an annual output of10.5 million tons of cold-rolled stainless steel plates in Qingdao. It is expected to be completed and put into production in 2005, which is also one of the largest cold-rolled stainless steel plate production projects in China.
The production process of stainless steel in Pohang Plant of Pohang Iron and Steel Company is as follows:
Pohang factory
The characteristics of its technological process can be summarized as follows:
○ 1 Two-step steelmaking and three-step steelmaking are used together.
○2 Both long profiles and plates can be produced.
The stainless steel products of Posco Iron and Steel Company include hot-rolled strip, cold-rolled plate, cold-rolled coil and hot-rolled thick plate, as well as long profiles, wires and seamless pipes such as round steel, square steel, flat steel, hexagonal angle steel and small angle steel.
6. Metallurgical Union Steel Company
Metallurgical Union Steel Co., Ltd. is the largest stainless steel joint venture in Taiwan Province Province, China. 1995 was put into production, and it was introduced and purchased successively.
Equipped with advanced equipment and technology, the production scale has been expanded and the production capacity has been rapidly improved. At present, it has the whole process of steelmaking, hot rolling and cold rolling. It has formed a comprehensive production capacity of 6,543,800 tons of steelmaking, 990,000 tons of continuous casting, 930,000 tons of hot rolling and 360,000 tons of cold rolling, making it the second largest stainless steel plate in the world. Thyssen Stainless Steel Company, Yuzhno Company, Avista? The sixth largest stainless steel producer in the world after Borarit, Arcelinox and Posco Steel. The stainless steel products of Metallurgy Steel Company are not only supplied to Taiwan Province Province, but also exported to Southeast Asia, Chinese mainland and Europe. The company plans to invest US$ 65.438+0.2 billion to build a new stainless steel cold-rolled sheet factory with an annual output of 300,000 tons in Huangpu Special Zone, Guangzhou.
The stainless steel production process of Metallurgy Steel Company is as follows:
The characteristics of its technological process can be summarized as follows:
① Stainless steel smelting adopts three steps: electric furnace →MRP converter →VOD.
(2) In order to meet the increase of slab demand, another 5-strand billet caster is transformed into slab and billet caster, of which two streams are transformed into narrow-gauge slabs and the other three streams can be used for slab casting. About 45% of the billet can be directly sent to the hot rolling furnace, and hot delivery to roll stainless steel is a major feature of stainless steel production in metallurgical joint.
③ Steckel mill is used to produce stainless steel coils, with a maximum annual output of 930,000 tons, exceeding the design capacity by more than 300,000 tons. This is the most efficient stainless steel steckel mill in the world. In addition to high output, the output of thin stainless steel (the thinnest 2.0mm) is also very large, accounting for about 50%.
④ Three 20-high Sendzimir mills are used for cold rolling, one of which has a width of1550 mm. ..
⑤ The pickling heat treatment line has a large capacity, with a monthly output of 52,000 tons of hot-rolled strip steel and 25,000 tons of cold-rolled strip steel.
The stainless steel products of Metallurgical Company mainly include hot rolled strip, cold rolled strip and bright annealed strip.
7. Nippon Steel Corporation
Nippon Steel ranks first among the world's steel enterprises for many years, and is the largest comprehensive steel enterprise in the world, with crude steel production accounting for about 26% of Japan's national steel production. While increasing output, the company is actively committed to equipment investment and adopting new technologies, increasing product categories and improving product technical content, thus enhancing competitiveness. As a high value-added product, stainless steel is also one of the main products of Nippon Steel.
Under the current trend of merger and reorganization of the world stainless steel enterprises with Europe as the main axis, in order to explore the possibility of improving efficiency and reducing costs in production, sales and procurement, Nippon Steel and Nippon Steel indicated that they have extensive cooperation in stainless steel, and established a new company NN Stainless Steel Planning Company in July 1999.
Nippon Steel has 9 production plants, and stainless steel is produced in Bagan Plant (600,000 tons/year) and Guangchang Plant (400,000 tons/year). The production process is as follows:
Baban factory
Guangchang
At present, the light factory is building and commissioning the thin slab caster with ultra-thin stainless steel strip, which is one of the most advanced process equipment in the world, with an annual production capacity of 350,000 tons and high product control accuracy.
The stainless steel products of Nippon Steel Company mainly include plate, thick plate, composite steel plate, hot rolled sheet and strip, cold rolled sheet and strip, bright annealed sheet and coil, wire rod, seamless steel pipe, straight welded pipe and so on.
8.AK steel company
AK Steel Company, located in Ohio, USA, is a joint venture between Armco Company of the United States and Kawasaki Steel Company of Japan, mainly producing thin plates. Armco 10, an American steel company, was optimistic about stainless steel production. At first, the company merged carbon steel production into a joint venture factory, and later became an independent company AK Steel Company. Armco mainly produces stainless steel plates and electrical steel plates in Butler plant in Pennsylvania and Mansfield plant in Ohio, and produces finished products in Coshockton plant and Zanesville plant in Ohio. After purchasing Armco's smelting and slab continuous casting capacity, the continuous pickling and annealing/pickling line of Rockport Factory of AK Iron and Steel Company has a stable source of stainless steel slabs. Especially in 1998, the factory stopped the production of hot-rolled carbon steel, turned to produce high value-added carbon steel and stainless steel strip, and invested 10 billion USD in finishing facilities, thus enabling the company to compete effectively in the world.
AK Steel Company's stainless steel production processes in Butler factory (900,000 tons/year) and Mansfield factory (654.38+032,000 tons/year cold rolled products) are as follows:
Butler factory
Mansfield factory
The main stainless steel products of AK Iron and Steel Company are hot rolled thin coils and coils, cold rolled thin coils and so on.
9. Allegheny? Lugu company
Allegheny? Lugu Company is the largest special steel company in the United States, and also the company that produces the most varieties of special metals in the world. Its main products are stainless steel plates, as well as other special steels, nickel-based superalloys, titanium and zirconium. The annual production capacity is 900,000 tons, including 700,000 tons of stainless steel. This company was founded in 1936. Like most steel enterprises in the United States, it was not until the 1970s that Europe and Japan began to turn to the oxygen top-blown converter process, while most carbon steel in the United States was produced by open hearth furnace, and high-quality steel and stainless steel in electric furnace were produced by secondary slag method in the furnace. In the late 1970s, the company installed the first AOD furnace and continuous casting machine. AOD furnace and computer control can determine and control the refining process and final smelting products of each stainless steel furnace. Today, Allegheny? Lugu Company has become a competitor of North American stainless steel company in stainless steel flat steel, which is established and owned by AK Steel Company of the United States, J&L Company of Eugenol Company of France and Arcelinox Company of Spain.
The company has nine production plants, stainless steel production is concentrated in Richie, Bleicken, Lichtenberg, Wallingford and Newcastle, and the last three are cold rolling plants.
The stainless steel production process of Brackenridge Plant is as follows:
Allegheny? The main stainless steel products of Lugu Company are: hot-rolled strip steel (for re-rolling), hot-rolled packaged narrow strip steel, cold-rolled packaged narrow strip steel, medium plate, thick plate, composite plate, hot-rolled coil, cold-rolled coil, bright annealed coil and straight welded pipe.
10. Nisshin Steel Company
Nisshin Iron and Steel Company is one of the top ten stainless steel enterprises in the world, and its output ranks second among Japanese stainless steel enterprises. The company was established on 1928 and registered as a joint-stock company on 1959. The company has six steel production plants, namely Wu Plant, Xiaqi Plant, Jiaochang Plant, Osaka Plant and Ishikawa Plant, as well as Toyo Plant under construction. Rixin Iron and Steel Company mainly produces high value-added steel products, such as coated steel plates, stainless steel plates and steel strips, hot-rolled and cold-rolled ordinary steel plates and steel strips, etc. The production capacity of stainless steel crude steel is about 480 thousand tons, and all kinds of cold-rolled coils are 300 thousand tons.
The company's stainless steel cold-rolled strip production is concentrated in Nan Zhou factory. Four sets of Sendzimir rolling mills were originally built. In June, Sendzimir Rolling Mill No.5 and Bright Annealing Unit No.4 were put into operation one after another 1998 165438 to replace the old equipment. With the fierce competition of stainless steel in the world and the downward trend of product prices, the large-scale transformation of Nisshin Steel's factory in Nan Zhou marks.
Nisshin Iron and Steel Company aims at improving the quality of stainless steel products, expanding varieties and improving production efficiency, and has shifted from the initial pursuit of output to a higher stage. Yuexing brand stainless steel produced by Rixin Iron and Steel Company is a world-famous product.
The production process of Nan Zhou plant of Nisshin Iron and Steel Company is as follows:
The characteristics of its technological process can be summarized as follows:
① The three-step process of smelting stainless steel with chromium-containing molten iron, electric furnace smelting, rapid decarbonization of combined blowing converter and VOD refining is beneficial to improve production efficiency and economic benefits.
② Equipped with the latest high crown roll hot tandem mill.
③ The newly-built No.5 Sendzimir mill adopts the most advanced automatic flatness control system and automatic operation at present, which greatly improves the precision control level of flatness and thickness.
④ The newly-built No.4 bright annealing unit adopts the latest technology in the world, which ensures the stable operation of the strip steel in the furnace and prevents the strip steel from breaking, scratching and sail shape deterioration during heating and cooling. The maximum speed of this production line is 70m/mln, and the output per hour reaches 14.3t, which is the highest production capacity in the world.
The stainless steel products of Rixin Iron and Steel Company include ingot, slab, hot rolled strip (for cold rolling), hot rolled packaged narrow strip and strip (without coating), cold rolled packaged narrow strip and strip (without coating), medium plate, thick plate, hot rolled thin plate and coil (without coating), cooling thin plate and coil (without coating), straight welded pipe, cold drawn steel pipe and so on.