Non-magnetic alloy forgings

• US 10,337,093 B2
• Filed: 10/13/2015
• Issued: 07/02/2019
• Est. Priority Date: 03/11/2013
• Status: Active Grant

• Current Assignee: ATI Properties LLC (CNH Industrial N.V.)
• Original Assignee: ATI Properties LLC (CNH Industrial N.V.)
• Inventors: Forbes Jones, Robin M., Smith, Jr., George J., Floder, Jason P., Thomas, Jean-Philippe A., Minisandram, Ramesh S.
• Primary Examiner(s): Schleis, Daniel J.
• Application Number:
  US14/881,633
• Publication Number:
  US 20160122851A1
• Time in Patent Office: 1,358 Days
• Field of Search: None
• CPC Class Codes: B21J 1/02 Preliminary treatment of metal stock without particular shaping, e.g. salvaging segregated zones, forging or pressing in the rough modifying the physical properties by deformation C21D7/00, C22F1/00
• CPC Class Codes: B21J 1/04 Shaping in the rough solely by forging or pressing
• CPC Class Codes: B21J 5/022 Open die forging
• CPC Class Codes: B21J 5/08 Upsetting
• CPC Class Codes: B21J 7/14 Forging machines working with several hammers
• CPC Class Codes: C21D 6/004 containing Cr and Ni
• CPC Class Codes: C21D 7/13 by hot working
• CPC Class Codes: C21D 8/005 of ferrous alloys C21D8/02 - C21D8/12 take precedence
• CPC Class Codes: C22C 38/001 containing N
• CPC Class Codes: C22C 38/002 containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
• CPC Class Codes: C22C 38/02 containing silicon
• CPC Class Codes: C22C 38/06 containing aluminium
• CPC Class Codes: C22C 38/42 with copper
• CPC Class Codes: C22C 38/44 with molybdenum or tungsten
• CPC Class Codes: C22C 38/46 with vanadium
• CPC Class Codes: C22C 38/48 with niobium or tantalum
• CPC Class Codes: C22C 38/50 with titanium or zirconium
• CPC Class Codes: C22C 38/52 with cobalt
• CPC Class Codes: C22C 38/54 with boron
• CPC Class Codes: C22C 38/58 with more than 1.5% by weight of manganese
• CPC Class Codes: Y10T 428/1241 : Nonplanar uniform thickness or nonlinear uniform diameter [e.g., L-shape]

Abstract

A method of processing a non-magnetic alloy workpiece comprises heating the workpiece to a warm working temperature, open die press forging the workpiece to impart a desired strain in a central region of the workpiece, and radial forging the workpiece to impart a desired strain in a surface region of the workpiece. In a non-limiting embodiment, after the steps of open die press forging and radial forging, the strain imparted in the surface region is substantially equivalent to the strain imparted in the central region. In another non-limiting embodiment, the strain imparted in the central and surface regions are in a range from 0.3 inch/inch to 1 inch/inch, and there exists no more than a 0.5 inch/inch difference in strain of the central region compared with the strain of the surface region of the workpiece. An alloy forging processed according to methods described herein also is disclosed.

Claims

1. A non-magnetic alloy forging comprising:

a circular cross-section with a diameter greater than 5.25 inches; and

at least one mechanical property that is substantially uniform throughout a cross-section of the forging, wherein the non-magnetic alloy exhibits a longitudinal yield strength greater than 156.9 ksi to 176.2 ksi.

2. The non-magnetic alloy forging of claim 1, wherein the non-magnetic alloy forging comprises one of a non-magnetic stainless steel alloy, a nickel alloy, a cobalt alloy, and an iron alloy.

3. The non-magnetic alloy forging of claim 1, wherein the non-magnetic alloy forging comprises a non-magnetic austenitic stainless steel alloy.

4. The non-magnetic alloy forging of claim 1, wherein the mechanical property is at least one of ultimate tensile strength, yield strength, percent elongation, and percent reduction in area.

5. The non-magnetic alloy forging of claim 1, wherein the diameter of the circular cross-section is at least 7.25 inches.

6. The non-magnetic alloy forging of claim 1, wherein the diameter of the circular cross-section is in a range of 7.25 inches to 12 inches.

7. The non-magnetic alloy forging of claim 1, wherein the alloy forging is a cylindrical alloy forging.

8. The non-magnetic alloy forging of claim 1, wherein the alloy is an austenitic stainless steel alloy having a composition as set out in UNS N08367.

9. The non-magnetic alloy forging of claim 1, wherein a nominal composition of the alloy comprises, in weight percentages, 0.03 carbon, 0.30 silicon, 15.1 manganese, 15.3 chromium, 2.1 molybdenum, 2.3 nickel, 0.4 nitrogen, incidental impurities, and balance iron.

10. The non-magnetic alloy forging of claim 1, wherein the alloy is an austenitic alloy comprising chromium, cobalt, copper, iron, manganese, molybdenum, nickel, carbon, nitrogen, tungsten, incidental impurities, and, optionally, trace elements.

11. The non-magnetic alloy forging of claim 10, wherein the alloy further comprises at least one of aluminum, silicon, titanium, boron, phosphorus, sulfur, niobium, tantalum, ruthenium, vanadium, and zirconium.

12. The non-magnetic alloy forging of claim 1, wherein the alloy comprises, in weight percentages, up to 0.2 carbon, up to 20 manganese, 0.1 to 1.0 silicon, 14.0 to 28.0 chromium, 15.0 to 38.0 nickel, 2.0 to 9.0 molybdenum, 0.1 to 3.0 copper, 0.08 to 0.9 nitrogen, 0.1 to 5.0 tungsten, 0.5 to 5.0 cobalt, up to 1.0 titanium, up to 0.05 boron, up to 0.05 phosphorus, up to 0.05 sulfur, iron, and incidental impurities.

13. The non-magnetic alloy forging of claim 1, wherein the alloy consists of, in weight percentages, up to 0.2 carbon, up to 20 manganese, 0.1 to 1.0 silicon, 14.0 to 28.0 chromium, 15.0 to 38.0 nickel, 2.0 to 9.0 molybdenum, 0.1 to 3.0 copper, 0.08 to 0.9 nitrogen, 0.1 to 5.0 tungsten, 0.5 to 5.0 cobalt, up to 1.0 titanium, up to 0.05 boron, up to 0.05 phosphorus, up to 0.05 sulfur, iron, and incidental impurities.

14. The non-magnetic alloy forging of claim 1, wherein the alloy comprises, in weight percentages, up to 0.05 carbon, 1.0 to 9.0 manganese, 0.1 to 1.0 silicon, 18.0 to 26.0 chromium, 19.0 to 37.0 nickel, 3.0 to 7.0 molybdenum, 0.4 to 2.5 copper, 0.1 to 0.55 nitrogen, 0.2 to 3.0 tungsten, 0.8 to 3.5 cobalt, up to 0.6 titanium, a combined weight percentage of columbium and tantalum no greater than 0.3, up to 0.2 vanadium, up to 0.1 aluminum, up to 0.05 boron, up to 0.05 phosphorus, up to 0.05 sulfur, iron, and incidental impurities.

15. The non-magnetic alloy forging of claim 1, wherein the alloy consists of, in weight percentages, up to 0.05 carbon, 1.0 to 9.0 manganese, 0.1 to 1.0 silicon, 18.0 to 26.0 chromium, 19.0 to 37.0 nickel, 3.0 to 7.0 molybdenum, 0.4 to 2.5 copper, 0.1 to 0.55 nitrogen, 0.2 to 3.0 tungsten, 0.8 to 3.5 cobalt, up to 0.6 titanium, a combined weight percentage of columbium and tantalum no greater than 0.3, up to 0.2 vanadium, up to 0.1 aluminum, up to 0.05 boron, up to 0.05 phosphorus, up to 0.05 sulfur, iron, and incidental impurities.

16. The non-magnetic alloy forging of claim 1, wherein the alloy comprises, in weight percentages, up to 0.05 carbon, 2.0 to 8.0 manganese, 0.1 to 0.5 silicon, 19.0 to 25.0 chromium, 20.0 to 35.0 nickel, 3.0 to 6.5 molybdenum, 0.5 to 2.0 copper, 0.2 to 0.5 nitrogen, 0.3 to 2.5 tungsten, 1.0 to 3.5 cobalt, up to 0.6 titanium, a combined weight percentage of columbium and tantalum no greater than 0.3, up to 0.2 vanadium, up to 0.1 aluminum, up to 0.05 boron, up to 0.05 phosphorus, up to 0.05 sulfur, iron, and incidental impurities.

17. The non-magnetic alloy forging of claim 1, wherein the alloy consists of, in weight percentages, up to 0.05 carbon, 2.0 to 8.0 manganese, 0.1 to 0.5 silicon, 19.0 to 25.0 chromium, 20.0 to 35.0 nickel, 3.0 to 6.5 molybdenum, 0.5 to 2.0 copper, 0.2 to 0.5 nitrogen, 0.3 to 2.5 tungsten, 1.0 to 3.5 cobalt, up to 0.6 titanium, a combined weight percentage of columbium and tantalum no greater than 0.3, up to 0.2 vanadium, up to 0.1 aluminum, up to 0.05 boron, up to 0.05 phosphorus, up to 0.05 sulfur, iron, and incidental impurities.

18. The non-magnetic alloy forging of claim 1, wherein the alloy has a magnetic permeability value (μ

_r) less than 1.01.

19. The non-magnetic alloy forging of claim 1, wherein the alloy has a magnetic permeability value (μ

_r) less than 1.005.

20. The non-magnetic alloy forging of claim 1, wherein the alloy has a magnetic permeability value (μ

_r) less than 1.001.

21. The non-magnetic alloy forging of claim 1, wherein the alloy is free from ferrite.

22. A cylindrical non-magnetic alloy forging comprising:

a circular cross-section with a diameter greater than 5.25 inches;

wherein at least one of ultimate tensile strength, yield strength, percent elongation, and percent reduction in area is uniform throughout a cross-section of the forging;

wherein the non-magnetic alloy exhibits a longitudinal yield strength greater than 156.9 ksi to 176.2 ksi; and

wherein the non-magnetic alloy is selected from a stainless steel alloy, a nickel alloy, a cobalt alloy, and an iron alloy.

23. The cylindrical non-magnetic alloy forging of claim 22, wherein the non-magnetic alloy is a non-magnetic austenitic stainless steel alloy.

24. The cylindrical non-magnetic alloy forging of claim 23, wherein the alloy has a magnetic permeability value (μ

_r) less than 1.01.

25. The cylindrical non-magnetic alloy forging of claim 23, wherein the alloy has a magnetic permeability value (μ

_r) less than 1.005.

26. The cylindrical non-magnetic alloy forging of claim 23, wherein the alloy has a magnetic permeability value (μ

_r) less than 1.001.

27. The cylindrical non-magnetic alloy forging of claim 23, wherein the alloy is free from ferrite.

28. The cylindrical non-magnetic alloy forging of claim 22, wherein the alloy is an austenitic stainless steel alloy having a composition as set out in UNS N08367.

29. The cylindrical non-magnetic alloy forging of claim 22, wherein the alloy comprises, in weight percentages, up to 0.2 carbon, up to 20 manganese, 0.1 to 1.0 silicon, 14.0 to 28.0 chromium, 15.0 to 38.0 nickel, 2.0 to 9.0 molybdenum, 0.1 to 3.0 copper, 0.08 to 0.9 nitrogen, 0.1 to 5.0 tungsten, 0.5 to 5.0 cobalt, up to 1.0 titanium, up to 0.05 boron, up to 0.05 phosphorus, up to 0.05 sulfur, iron, and incidental impurities.

30. The cylindrical non-magnetic alloy forging of claim 22, wherein the alloy consists of, in weight percentages, up to 0.2 carbon, up to 20 manganese, 0.1 to 1.0 silicon, 14.0 to 28.0 chromium, 15.0 to 38.0 nickel, 2.0 to 9.0 molybdenum, 0.1 to 3.0 copper, 0.08 to 0.9 nitrogen, 0.1 to 5.0 tungsten, 0.5 to 5.0 cobalt, up to 1.0 titanium, up to 0.05 boron, up to 0.05 phosphorus, up to 0.05 sulfur, iron, and incidental impurities.

31. A non-magnetic alloy forging comprising:

a circular cross-section with a diameter greater than 5.25 inches; and

at least one mechanical property that is substantially uniform throughout a cross-section of the forging, wherein the non-magnetic alloy exhibits an ultimate tensile strength greater than 170.1 ksi to 191.6 ksi.

32. The non-magnetic alloy forging of claim 31, wherein the non-magnetic alloy forging comprises one of a non-magnetic stainless steel alloy, a nickel alloy, a cobalt alloy, and an iron alloy.

33. The non-magnetic alloy forging of claim 31, wherein the non-magnetic alloy forging comprises a non-magnetic austenitic stainless steel alloy.

34. The non-magnetic alloy forging of claim 31, wherein the mechanical property is at least one of ultimate tensile strength, yield strength, percent elongation, and percent reduction in area.

35. The non-magnetic alloy forging of claim 31, wherein the diameter of the circular cross-section is at least 7.25 inches.

36. The non-magnetic alloy forging of claim 31, wherein the diameter of the circular cross-section is in a range of 7.25 inches to 12 inches.

37. The non-magnetic alloy forging of claim 31, wherein the alloy forging is a cylindrical alloy forging.

38. The non-magnetic alloy forging of claim 31, wherein the alloy is an austenitic stainless steel alloy having a composition as set out in UNS N08367.

39. The non-magnetic alloy forging of claim 31, wherein a nominal composition of the alloy comprises, in weight percentages, 0.03 carbon, 0.30 silicon, 15.1 manganese, 15.3 chromium, 2.1 molybdenum, 2.3 nickel, 0.4 nitrogen, incidental impurities, and balance iron.

40. The non-magnetic alloy forging of claim 31, wherein the alloy is an austenitic alloy comprising chromium, cobalt, copper, iron, manganese, molybdenum, nickel, carbon, nitrogen, tungsten, incidental impurities, and, optionally, trace elements.

41. The non-magnetic alloy forging of claim 40, wherein the alloy further comprises at least one of aluminum, silicon, titanium, boron, phosphorus, sulfur, niobium, tantalum, ruthenium, vanadium, and zirconium.

42. The non-magnetic alloy forging of claim 31, wherein the alloy comprises, in weight percentages, up to 0.2 carbon, up to 20 manganese, 0.1 to 1.0 silicon, 14.0 to 28.0 chromium, 15.0 to 38.0 nickel, 2.0 to 9.0 molybdenum, 0.1 to 3.0 copper, 0.08 to 0.9 nitrogen, 0.1 to 5.0 tungsten, 0.5 to 5.0 cobalt, up to 1.0 titanium, up to 0.05 boron, up to 0.05 phosphorus, up to 0.05 sulfur, iron, and incidental impurities.

43. The non-magnetic alloy forging of claim 31, wherein the alloy consists of, in weight percentages, up to 0.2 carbon, up to 20 manganese, 0.1 to 1.0 silicon, 14.0 to 28.0 chromium, 15.0 to 38.0 nickel, 2.0 to 9.0 molybdenum, 0.1 to 3.0 copper, 0.08 to 0.9 nitrogen, 0.1 to 5.0 tungsten, 0.5 to 5.0 cobalt, up to 1.0 titanium, up to 0.05 boron, up to 0.05 phosphorus, up to 0.05 sulfur, iron, and incidental impurities.

44. The non-magnetic alloy forging of claim 31, wherein the alloy has a magnetic permeability value (μ

_r) less than 1.01.

45. The non-magnetic alloy forging of claim 31, wherein the alloy has a magnetic permeability value (μ

_r) less than 1.005.

46. The non-magnetic alloy forging of claim 31, wherein the alloy has a magnetic permeability value (μ

_r) less than 1.001.

47. A non-magnetic alloy forging comprising:

a circular cross-section with a diameter greater than 5.25 inches; and

at least one mechanical property that is substantially uniform throughout a cross-section of the forging, wherein the alloy is an austenitic alloy comprising chromium, iron, manganese, molybdenum, nickel, carbon, nitrogen, incidental impurities, and, optionally, trace elements.

48. The non-magnetic alloy forging of claim 47, wherein the alloy further comprises at least one of cobalt, copper, tungsten, aluminum, silicon, titanium, boron, phosphorus, sulfur, niobium, tantalum, ruthenium, vanadium, and zirconium.

49. The non-magnetic alloy forging of claim 47, wherein a nominal composition of the alloy comprises, in weight percentages, 0.03 carbon, 0.30 silicon, 15.1 manganese, 15.3 chromium, 2.1 molybdenum, 2.3 nickel, 0.4 nitrogen, incidental impurities, and balance iron.

50. The non-magnetic alloy forging of claim 47, wherein the alloy comprises, in weight percentages, up to 0.2 carbon, up to 20 manganese, 0.1 to 1.0 silicon, 14.0 to 28.0 chromium, 15.0 to 38.0 nickel, 2.0 to 9.0 molybdenum, 0.1 to 3.0 copper, 0.08 to 0.9 nitrogen, 0.1 to 5.0 tungsten, 0.5 to 5.0 cobalt, up to 1.0 titanium, up to 0.05 boron, up to 0.05 phosphorus, up to 0.05 sulfur, iron, and incidental impurities.

51. The non-magnetic alloy forging of claim 47, wherein the alloy consists of, in weight percentages, up to 0.2 carbon, up to 20 manganese, 0.1 to 1.0 silicon, 14.0 to 28.0 chromium, 15.0 to 38.0 nickel, 2.0 to 9.0 molybdenum, 0.1 to 3.0 copper, 0.08 to 0.9 nitrogen, 0.1 to 5.0 tungsten, 0.5 to 5.0 cobalt, up to 1.0 titanium, up to 0.05 boron, up to 0.05 phosphorus, up to 0.05 sulfur, iron, and incidental impurities.

52. The non-magnetic alloy forging of claim 47, wherein the alloy comprises, in weight percentages, up to 0.05 carbon, 1.0 to 9.0 manganese, 0.1 to 1.0 silicon, 18.0 to 26.0 chromium, 19.0 to 37.0 nickel, 3.0 to 7.0 molybdenum, 0.4 to 2.5 copper, 0.1 to 0.55 nitrogen, 0.2 to 3.0 tungsten, 0.8 to 3.5 cobalt, up to 0.6 titanium, a combined weight percentage of columbium and tantalum no greater than 0.3, up to 0.2 vanadium, up to 0.1 aluminum, up to 0.05 boron, up to 0.05 phosphorus, up to 0.05 sulfur, iron, and incidental impurities.

53. The non-magnetic alloy forging of claim 47, wherein the alloy consists of, in weight percentages, up to 0.05 carbon, 1.0 to 9.0 manganese, 0.1 to 1.0 silicon, 18.0 to 26.0 chromium, 19.0 to 37.0 nickel, 3.0 to 7.0 molybdenum, 0.4 to 2.5 copper, 0.1 to 0.55 nitrogen, 0.2 to 3.0 tungsten, 0.8 to 3.5 cobalt, up to 0.6 titanium, a combined weight percentage of columbium and tantalum no greater than 0.3, up to 0.2 vanadium, up to 0.1 aluminum, up to 0.05 boron, up to 0.05 phosphorus, up to 0.05 sulfur, iron, and incidental impurities.

54. The non-magnetic alloy forging of claim 47, wherein the alloy comprises, in weight percentages, up to 0.05 carbon, 2.0 to 8.0 manganese, 0.1 to 0.5 silicon, 19.0 to 25.0 chromium, 20.0 to 35.0 nickel, 3.0 to 6.5 molybdenum, 0.5 to 2.0 copper, 0.2 to 0.5 nitrogen, 0.3 to 2.5 tungsten, 1.0 to 3.5 cobalt, up to 0.6 titanium, a combined weight percentage of columbium and tantalum no greater than 0.3, up to 0.2 vanadium, up to 0.1 aluminum, up to 0.05 boron, up to 0.05 phosphorus, up to 0.05 sulfur, iron, and incidental impurities.

55. The non-magnetic alloy forging of claim 47, wherein the alloy consists of, in weight percentages, up to 0.05 carbon, 2.0 to 8.0 manganese, 0.1 to 0.5 silicon, 19.0 to 25.0 chromium, 20.0 to 35.0 nickel, 3.0 to 6.5 molybdenum, 0.5 to 2.0 copper, 0.2 to 0.5 nitrogen, 0.3 to 2.5 tungsten, 1.0 to 3.5 cobalt, up to 0.6 titanium, a combined weight percentage of columbium and tantalum no greater than 0.3, up to 0.2 vanadium, up to 0.1 aluminum, up to 0.05 boron, up to 0.05 phosphorus, up to 0.05 sulfur, iron, and incidental impurities.

56. The non-magnetic alloy forging of claim 47, wherein the alloy has a magnetic permeability value (μ

_r) less than 1.01.

57. The non-magnetic alloy forging of claim 47, wherein the alloy has a magnetic permeability value (μ

_r) less than 1.005.

58. The non-magnetic alloy forging of claim 47, wherein the alloy has a magnetic permeability value (μ

_r) less than 1.001.

59. The non-magnetic alloy forging of claim 47, wherein the alloy is free from ferrite.