Abstract: The present disclosure relates to a method for straightening of a tube comprising a ferritic FeCrAl-alloy. One reason for the challenges regarding the cold working of a hollow of a ferritic FeCrAl-alloy into a finished tube is that FeCrAl-alloys have a low ductility. Even if a tube of a FeCrAl-alloy is obtained by cold working a hollow into a tube, the tube can hardly be straightened. This is even more a problem if a tube obtained is annealed, wherein the annealing leads to a deformation of tube along the longitudinal direction of the tube. Therefore, there is a need for a method for straightening of a tube comprising a ferritic FeCrAl-alloy. Thus, according to the present disclosure a method for straightening of a tube is suggested, wherein the method comprises the steps of providing a tube comprising a ferritic FeCrAl-alloy, heating the tube, and straightening and forming the heated tube by stretching.

Abstract: A heating element comprises a main body having a three-dimensional matrix with an open structure including openings and internal voids, cavities and/or pores extending throughout the main body. The three-dimensional matrix is provided as a lattice having a repeating unit cell extending in three directions. The present heating element is adapted for maximised surface area so as to provide an effective and efficient thermal energy transfer medium.

Abstract: The present invention relates to a method for forming a hollow 26 of a ferritic FeCrAl alloy into a tube 2. While tubes made of powder metallurgical, dispersion hardened, ferritic FeCrAl alloys are commercially available, hollows made of FeCrAl alloys so far can hardly be formed into tubes of small dimensions. The major reason for the problems in forming hollows of a ferritic FeCrAI alloy into a finished product is that FeCrAl alloys are brittle. It is therefore an aspect of the present invention to provide a tube 2 made of a ferritic FeCrAl alloy having arbitrary small dimensions. Furthermore, it is an aspect of the present invention to provide a machine 1 and a method for forming a tubular hollow 26 into a finished tube 2 of a ferritic FeCrAl alloy. At least one of the above aspects is addressed by a method for forming a hollow into a tube 2 comprising the steps providing the hollow 26 of a ferritic FeCrAl alloy, heating the hollow 26 to a temperature in a range from 90° C. to 150° C.

Abstract: A ferritic alloy comprising in weight %: C: 0.01-0.1; N: 0.001-0.1; O: ?0.2; B: ?0.01; Cr: 9.0-13.0; Al: 2.5-8.0; Si: ?0.5; Mn: ?0.4; Y: ?2.2; Sc+Ce+La: ?0.2; Mo+W: ?4.0; Ti: ?1.7; Zr: ?3.3; Nb: ?3.3; V: ?1.8; Hf+Ta+Th: ?6.5; the balance being Fe and unavoidable impurities, wherein, the amounts of Ti+Zr+Nb+V+Hf+Ta+Th and C, N and O are balanced such that: at ? ? % ? ? Ti + at ? ? % ? ? Zr + at ? ? % ? ? Nb + at ? ? % ? ? V + at ? ? % ? ? Hf + at ? ? % ? ? Ta + at ? ? % ? ? Th - x * at ? ? % ? ? O - at ? ? % ? ? N at ? ? % ? ? C ? 1 wherein x is 0.5 unless the content of Y is more than or equal to 0.01 wt % then x is 0.67.

Abstract: The present disclosure relates to a method for straightening of a tube comprising a ferritic FeCrAl-alloy. One reason for the challenges regarding the cold working of a hollow of a ferritic FeCrAl-alloy into a finished tube is that FeCrAl-alloys have a low ductility. Even if a tube of a FeCrAl-alloy is obtained by cold working a hollow into a tube, the tube can hardly be straightened. This is even more a problem if a tube obtained is annealed, wherein the annealing leads to a deformation of tube along the longitudinal direction of the tube. Therefore, there is a need for a method for straightening of a tube comprising a ferritic FeCrAl-alloy. Thus, according to the present disclosure a method for straightening of a tube is suggested, wherein the method comprises the steps of providing a tube comprising a ferritic FeCrAl-alloy, heating the tube, and straightening and forming the heated tube by stretching.

Abstract: A ferritic alloy comprising in weight %: C: 0.01-0.1; N: 0.001-0.1; O: ?0.2; B: ?0.01; Cr: 9.0-13.0; Al: 2.5-8.0; Si: ?0.5; Mn: ?0.4; Y: ?2.2; Sc+Ce+La: ?0.2; Mo+W: ?4.0; Ti: ?1.7; Zr: ?3.3; Nb: ?3.3; V: ?1.8; Hf+Ta+Th: ?6.5; the balance being Fe and unavoidable impurities, wherein, the amounts of Ti+Zr+Nb+V+Hf+Ta+Th and C, N and O are balanced such that: at ? ? % ? ? Ti + at ? ? % ? ? Zr + at ? ? % ? ? Nb + at ? ? % ? ? V + at ? ? % ? ? Hf + at ? ? % ? ? Ta + at ? ? % ? ? Th - x * at ? ? % ? ? O - at ? ? % ? ? N at ? ? % ? ? C ? 1 wherein x is 0.5 unless the content of Y is more than or equal to 0.01 wt % then x is 0.67.

Abstract: The present invention relates to a method for forming a hollow 26 of a ferritic FeCrAI alloy into a tube 2. While tubes made of powder metallurgical, dispersion hardened, ferritic FeCrAI alloys are commercially available, hollows made of FeCrAI alloys so far can hardly be formed into tubes of small dimensions. The major reason for the problems in forming hollows of a ferritic FeCrAI alloy into a finished product is that FeCrAI alloys are brittle. It is therefore an aspect of the present invention to provide a tube 2 made of a ferritic FeCrAI alloy having arbitrary small dimensions. Furthermore, it is an aspect of the present invention to provide a machine 1 and a method for forming a tubular hollow 26 into a finished tube 2 of a ferritic FeCrAI alloy. At least one of the above aspects is addressed by a method for forming a hollow into a tube 2 comprising the steps providing the hollow 26 of a ferritic FeCrAI alloy, heating the hollow 26 to a temperature in a range from 90° C. to 150° C.

Abstract: A ferritic alloy comprising in weight %: C: 0.01-0.1; N: 0.001-0.1; O: ?0.2; B: ?0.01; Cr: 9.0-13.0; Al: 2.5-8.0; Si: ?0.5; Mn: ?0.4; Y: ?2.2; Sc+Ce+La: ?0.2; Mo+W: ?4.0; Ti: ?1.7; Zr: ?3.3; Nb: ?3.3; V: ?1.8; Hf+Ta+Th: ?6.5; the balance being Fe and unavoidable impurities, wherein, the amounts of Ti+Zr+Nb+V+Hf+Ta+Th and C, N and O are balanced such that: at ? ? % ? ? Ti + at ? ? % ? ? Zr + at ? ? % ? ? Nb + at ? ? % ? ? V + at ? ? % ? ? Hf + at ? ? % ? ? Ta + at ? ? % ? ? Th - x * at ? ? % ? ? O - at ? ? % ? ? N at ? ? % ? ? C ? 1 wherein x is 0.5 unless the content of Y is more than or equal to 0.01 wt % then x is 0.67.