Patent Number: 
Section: claims

1. A ferritic alloy comprising in weight %:C: 0.01-0.04;N: 0.02-0.1;O: 0.01-0.1;B: ≤0.01;Cr: 9.0-11.5;Al: 2.5-8.0;Si: <0.5;Mn: <0.4;Y: 0.01-1.2;Sc+Ce+La: ≤0.2;Mo+W: ≤4.0;Ti: 0.06-0.09;Zr: 0.04-2.4;Nb: 0.04-2.4;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 0 are balanced such that:  1.2  ≤                                                        at              ⁢                                                          ⁢              %              ⁢                                                          ⁢              Ti                        +                          at              ⁢                                                                                ⁢                                                                              ⁢              %              ⁢                                                          ⁢              Zr                        +                          at              ⁢                                                          ⁢              %              ⁢                                                          ⁢              Nb                        +                          at              ⁢                                                          ⁢              %              ⁢                                                                                ⁢                                                                              ⁢              V                        +                                                                          at              ⁢                                                          ⁢              %              ⁢                                                          ⁢              Hf                        +                          at              ⁢                                                          ⁢              %              ⁢                                                          ⁢              Ta                        +                          at              ⁢                                                          ⁢              %              ⁢                                                          ⁢              Th                        -                          x              *              at              ⁢                                                          ⁢              %              ⁢                                                          ⁢              O                        -                          at              ⁢                                                          ⁢              %              ⁢                                                          ⁢              N                                                  at      ⁢                                        ⁢                                      ⁢      %      ⁢                          ⁢      C        ≥  2.0wherein x is 0.5 unless the content of Y is more than or equal to 0.01 wt % then x is 0.67, andwherein the ferritic alloy includes dispersoids of one or more of ZrC, NbC, Nb2C, HfC, VC, ThC, TaC, or combinations thereof. 2. The ferritic alloy according to claim 1, wherein the ferritic alloy comprises no added wt % Sc+Ce+La or no added wt % Ce+La. 3. The ferritic alloy according to claim 1, wherein the ferritic alloy comprises Cr in the range of from 9.0 to 11.0 wt %. 4. The ferritic alloy according to claim 1, wherein C is in the range of from 0.02-0.03 wt %. 5. The ferritic alloy according to claim 1, wherein N is in the range of from 0.02-0.08 wt %. 6. The ferritic alloy according to claim 1, wherein O is in the range of from 0.01-0.08 wt %. 7. The ferritic alloy according to claim 1, wherein Al is in the range of from 3.0-7.0 wt %. 8. The ferritic alloy according to claim 1, wherein Y is in the range of from 0.04-1.0 wt %. 9. The ferritic alloy according to claim 1, wherein Ti is in the range of from 0.06-0.08 wt %. 10. The ferritic alloy according to claim 1, wherein Zr is in the range of from 0.3-1.4 wt %. 11. The ferritic alloy according to claim 1, wherein Nb is in the range of 0.08-1.4 wt %. 12. A method of improving corrosion resistance, comprising:forming an object from the ferritic alloy according to claim 1,wherein, in operation, the object is exposed to a temperature range of 300-800° C. 13. The method of claim 12, wherein the object is selected from the group consisting of a boiler and a furnace of a heat generating plant or of an energy generating plant. 14. The method of claim 12, wherein the object is selected from the group consisting of an overlay welding, a spray coating and a composite tube. 15. The ferritic alloy according to claim 1, wherein Zr is in the range of from 0.1-0.9 wt % and wherein Nb is in the range of 0.08-1.4 wt %. 16. The ferritic alloy according to claim 1, wherein Zr+Nb is in the range of 0.08-2.8 wt %. 17. The ferritic alloy according to claim 1, wherein Al is in the range of from 4-6 wt %. 18. The ferritic alloy according to claim 1, wherein the ferritic alloy includes dispersoids, wherein the dispersoids are in the form of a cluster including a TiC dispersoid core enclosed by dispersoids of ZrC, NbC, Nb2C, HfC, VC, ThC, TaC, or combinations thereof. 19. The ferritic alloy according to claim 1, wherein Ti is in the range of from 0.07-0.09 wt %. 20. The ferritic alloy according to claim 1, wherein Ti is in the range of from 0.07-0.09 wt % and C is in the range of from 0.03 to 0.04 wt. %.