Steel shell for a suction roll and a method of producing a steel product
a steel shell and suction roll technology, applied in the field of steel shell for a suction roll and a production method of a steel product, can solve the problems of poor cuttability of steel types such as high nitrogen content, poor corrosion resistance of martensite steels, and low strength of austenite steels, and achieve good corrosion resistance and high strength.
Inactive Publication Date: 2015-09-10
OUTOKUMPU OY
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- Application Information
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Benefits of technology
[0035]By the invention, the advantage is obtained, among other things, that the completed roll shell achieves a very good corrosion resistance.
Problems solved by technology
However, it has been previously shown that steel types of such a high nitrogen content are poor in cuttability.
However, compared with duplex steels, martensite steels have a poorer corrosion resistance.
However, compared with duplex steels, austenite steels have a lower strength.
In that publication, it is stated that since they are difficult to drill, stainless ferrite-austenite duplex steels are unsuitable as materials for suction rolls.
Method used
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[0017]In the following, the manufacturing of suction roll shells is schematically described. With reference to FIG. 1, a first step in the manufacturing of a suction roll shell is shown. As is shown in FIG. 1, an essentially planar blank 1 is roller bent between two rollers 2, 3, as is known as such and need not be described in greater detail herein. After bending to an essentially circular shape, the ends of the blank 1 are welded together such that a weld joint unites the blank 1 to form a segment 9. A plurality of segments are then united by circular joints to form a shell that is heat treated after the welding. FIG. 3 shows how the thus achieved shell 9 can be subjected to a working operation, such as turning. FIG. 3 shows a turning tool 5 acting on the face of the shell 9. The object of the turning operation is to ensure that the face of the shell 9 is smooth and regular. FIG. 4 shows schematically a subsequent step in the manufacturing process, in which the shell 9 is drilled ...
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Abstract
A suction roll shell having a plurality of through holes is made of a stainless ferrite-austenite steel having a micro-structure essentially consisting of 35-65% by volume of ferrite and 35-65% by volume of austenite. The steel has a composition containing, among other things, 0.005-0.07 C and 0.15-0.30 N, in % by weight.
Description
TECHNICAL FIELD[0001]The invention relates to a steel shell for a suction roll and a method of producing a steel product, in which method a piece of steel material is worked by a cutting operation such as milling, turning and / or drilling.BACKGROUND OF THE INVENTION[0002]Stainless steel is used in fields in which a high corrosion resistance is necessary. A high corrosion resistance may be required in environments within off-shore, paper and pulp industry and chemical industry. One example is suction roll shells for paper machines, that are manufactured from stainless steel. One type of stainless steel is the so called duplex steels that contain ferrite and austenite. Duplex steels are known to combine a high mechanical strength and toughness with a good corrosion resistance, in particular in terms of stress corrosion and corrosion fatigue. For corrosion resistance as well as mechanical properties such as weldability, it is important that the steel is well balanced in terms of the ess...
Claims
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IPC IPC(8): D21F1/50C22C38/34C22C38/02C22C38/52C22C38/42C22C38/44C22C38/50C22C38/48C22C38/58C22C38/00C22CD21F3/10
CPCC22C38/50C22C38/48C22C38/52D21F1/50C22C38/58C22C38/44C22C38/02C22C38/004C22C38/001C22C38/42C22C38/34C22C38/40D21F3/105D21F3/10
Inventor LILJAS, MATSJOHANSSON, PELLEBERGKVIST, CONNY
Owner OUTOKUMPU OY