Method of producing cold-worked centrifugal cast tubular products
A method of producing a seamless, tubular product includes centrifugally casting a corrosion resistant alloy into a tubular workpiece having an inner diameter and an outer diameter. The method then removes material from the inner diameter of the workpiece and subjects the workpiece to at least about a 25% wall reduction at a temperature below a recrystallization temperature of the workpiece using a metal forming process. The metal forming process includes radial forging, rolling, pilgering, and/or flowforming.
1. A method of producing a seamless, tubular product, the method comprising:
centrifugally casting a corrosion resistant alloy into a tubular workpiece having an inner diameter and an outer diameter;
removing material from the inner diameter of the workpiece; and
subjecting the workpiece to at least about a 25% wall reduction at a temperature below a recrystallization temperature of the workpiece using a metal forming process, the metal forming process comprising radial forging, rolling, pilgering, flowforming, or a combination thereof.
2. The method of claim 1 , wherein the wall reduction is at least about 35%.
3. The method of claim 2 , wherein the at least about 35% wall reduction includes at least two reductions, wherein the first reduction is at least about a 25% wall reduction.
4. The method of claim 1 , wherein the wall reduction is at least about 50%.
5. The method of claim 4 , wherein the at least about 50% wall reduction includes at least two reductions, wherein the first reduction is at least about a 25% wall reduction.
6. The method of claim 1 , wherein the corrosion resistant alloy includes a stainless steel alloy, a titanium-based alloy, a nickel-based alloy, a cobalt-based alloy or a zirconium-based alloy.
7. The method of claim 1 , further comprising removing material from the outer diameter of the workpiece before subjecting the workpiece to the wall reduction.
8. The method of claim 1 , further comprising annealing the workpiece after subjecting the workpiece to the wall reduction.
9. The method of claim 8 , further comprising subjecting the workpiece to at least about a 10% wall reduction after annealing the workpiece.
10. The method of claim 1 , wherein the metal forming process is radial forging.
11. The method of claim 1 , wherein the metal forming process is rolling.
12. The method of claim 1 , wherein the metal forming process is pilgering.
13. The method of claim 1 , wherein the metal forming process is flowforming.
14. The method of claim 1 , further comprising annealing, age hardening, and then annealing the workpiece before subjecting the workpiece to the wall reduction.
15. The method of claim 1 , further comprising forming a rifling on an inner diameter of the workpiece.
16. The method of claim 1 , wherein the metal forming process comprises:
providing at least two rollers having a displacement from one another in an axial direction with respect to the workpiece; and
compressing the outer diameter of the workpiece with the rollers at a temperature below the recrystallization temperature of the workpiece using a combination of axial and radial forces so that the mandrel contacts the inner diameter and imparts a compressive hoop stress to the inner diameter of the workpiece.
17. A tubular component produced according to the method of claim 1 .