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Uddeholms AB
Uddeholms AB is a multinational producer of high alloyed tool steel with production in Hagfors, Sweden. Since 1991, the company is part of the Austrian Böhler-Uddeholm group which in turn is part of the voestalpine AG group since 2007. Uddeholms AB has 800 Swedish and 3,000 total employees.
The company was founded in 1668 by Bengt Gustaf Geijer. The company was then privately held until 1870 when it became a public company named Uddeholms AB. During the second half of the 19th century, the company introduced electricity and railways to their production. The Uddeholm railway was the first private railway in Sweden and also one of the first to be electrified in 1920.[citation needed]
The company was introduced to the United States in the 1830s and in the 1920s a modern international sales organization was created. In 1945, Associated Swedish Steel was created together with four other major Swedish steel producers to sell steel to the new markets in South America, Africa, Middle East and Asia. In 1976, Uddeholm bought the whole of ASSAB and since 1 April 2011, it is fully integrated in Uddeholms AB with the exception of ASSAB Pacific Pte Ltd.
Uddeholms AB's production plant is Hagfors Järnverk (Hagfors Iron mill) in Hagfors, Sweden. There are three production routes. In every route except granulation, the materials are heat treated and machined.
This type of production has three phases. First, steel scrap is melted in an Electric Arc Furnace. After melting, the steel is purified in a secondary treatment to remove sulfur, slag and other unwanted materials. In the third step, the steel is poured into an ingot. Different methods such as Up-hill casting and the use of protective noble gases can further improve quality.
In the electro-slag remelting (ESR) process, steel scrap is first melted using the conventional process but is then remelted in a water-cooled form. With this process, a more even microstructure can be achieved which gives completely different properties than a material produced with the conventional method. There are different variants of the electro-slag remelting process where the remelting is done in vacuum or a protective atmosphere.
In the powder metallurgical process, a fine powder is created by spraying a stream of liquid steel with nitrogen under high pressure. The average diameter of the powder is 50-100 μm. The powder is filled into capsules directly in order to avoid contamination. With hot isostatic pressing (HIP), the powder is consolidated to 100% density. The advantage with powder metallurgical tool steels is to have a high degree of alloys without getting segregations in the material. This makes it possible to combine high material hardness with wear resistance.
The Granshot process was developed at Uddeholm. In the Granshot process, hot liquid molten metal is poured at a flat surface, dispersing it so that small droplets are created. These metal droplets are immediately cooled in water, creating granules which are dewatered. The process is applicable to iron, steel, stainless steel, ferro alloys and base metals. These granules have ideal metallurgical and logistical properties as to facilitate the use of granules into blast furnaces, electric arc furnaces, AODs, foundries etc. For example, the granules can be used in casting of tools in order to achieve tools with even metallurgical properties. In 2007, the independent and privately owned Swedish engineering company UHT - Uvån Hagfors Teknologi AB, was formed and also took over all intellectual property rights including the trademark Granshot. Uddeholm has continued to produce metal granulates, so called Granshots, using their Granshot unit in Hagfors, Sweden.
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Uddeholms AB
Uddeholms AB is a multinational producer of high alloyed tool steel with production in Hagfors, Sweden. Since 1991, the company is part of the Austrian Böhler-Uddeholm group which in turn is part of the voestalpine AG group since 2007. Uddeholms AB has 800 Swedish and 3,000 total employees.
The company was founded in 1668 by Bengt Gustaf Geijer. The company was then privately held until 1870 when it became a public company named Uddeholms AB. During the second half of the 19th century, the company introduced electricity and railways to their production. The Uddeholm railway was the first private railway in Sweden and also one of the first to be electrified in 1920.[citation needed]
The company was introduced to the United States in the 1830s and in the 1920s a modern international sales organization was created. In 1945, Associated Swedish Steel was created together with four other major Swedish steel producers to sell steel to the new markets in South America, Africa, Middle East and Asia. In 1976, Uddeholm bought the whole of ASSAB and since 1 April 2011, it is fully integrated in Uddeholms AB with the exception of ASSAB Pacific Pte Ltd.
Uddeholms AB's production plant is Hagfors Järnverk (Hagfors Iron mill) in Hagfors, Sweden. There are three production routes. In every route except granulation, the materials are heat treated and machined.
This type of production has three phases. First, steel scrap is melted in an Electric Arc Furnace. After melting, the steel is purified in a secondary treatment to remove sulfur, slag and other unwanted materials. In the third step, the steel is poured into an ingot. Different methods such as Up-hill casting and the use of protective noble gases can further improve quality.
In the electro-slag remelting (ESR) process, steel scrap is first melted using the conventional process but is then remelted in a water-cooled form. With this process, a more even microstructure can be achieved which gives completely different properties than a material produced with the conventional method. There are different variants of the electro-slag remelting process where the remelting is done in vacuum or a protective atmosphere.
In the powder metallurgical process, a fine powder is created by spraying a stream of liquid steel with nitrogen under high pressure. The average diameter of the powder is 50-100 μm. The powder is filled into capsules directly in order to avoid contamination. With hot isostatic pressing (HIP), the powder is consolidated to 100% density. The advantage with powder metallurgical tool steels is to have a high degree of alloys without getting segregations in the material. This makes it possible to combine high material hardness with wear resistance.
The Granshot process was developed at Uddeholm. In the Granshot process, hot liquid molten metal is poured at a flat surface, dispersing it so that small droplets are created. These metal droplets are immediately cooled in water, creating granules which are dewatered. The process is applicable to iron, steel, stainless steel, ferro alloys and base metals. These granules have ideal metallurgical and logistical properties as to facilitate the use of granules into blast furnaces, electric arc furnaces, AODs, foundries etc. For example, the granules can be used in casting of tools in order to achieve tools with even metallurgical properties. In 2007, the independent and privately owned Swedish engineering company UHT - Uvån Hagfors Teknologi AB, was formed and also took over all intellectual property rights including the trademark Granshot. Uddeholm has continued to produce metal granulates, so called Granshots, using their Granshot unit in Hagfors, Sweden.