PLUNGER WITH ION NITRIDING TREATMENT FOR A HYDRAULIC FRACTURING PUMP AND A METHOD FOR MAKING SAID PLUNGER

• US 20170082194A1
• Filed: 09/22/2016
• Published: 03/23/2017
• Est. Priority Date: 09/22/2015
• Status: Active Grant

• Current Assignee: ionar s.a., YPF Tecnología S.A.
• Original Assignee: ionar s.a., YPF Tecnología S.A.
• Inventors: CARFI, Guillermo Rodolfo, CIRIMELLO, Pablo Gabriel, Cabo, Amado
• Granted Patent: US 10,260,630 B2
• Time in Patent Office: Days
• CPC Class Codes: C21D 1/18 Hardening C21D1/02 takes precedence; Quenching with or without subsequent tempering quenching devices C21D1/62
• CPC Class Codes: C21D 9/0068 for particular articles not mentioned below
• CPC Class Codes: C23C 8/38 Treatment of ferrous surfaces
• CPC Class Codes: C23C 8/80 After-treatment
• CPC Class Codes: F04B 15/02 the fluids being viscous or non-homogeneous
• CPC Class Codes: F04B 47/02 the driving mechanisms being situated at ground level F04B47/12 takes precedence
• CPC Class Codes: F04B 53/14 Pistons, piston-rods or piston-rod connections
• CPC Class Codes: F16J 1/001 One-piece pistons
• CPC Class Codes: F16J 1/01 characterised by the use of particular materials F16J1/02 takes precedence

Abstract

Steel plungers for hydraulic fracturing pumps having enhanced surface hardness properties, preferably made of alloyed steel and a method for manufacturing said plungers, comprising an ion nitriding process.

Claims

1. A plunger for a hydraulic fracturing pump, wherein the plunger is a steel plunger treated with an ion nitriding process.

2. The plunger according to claim 1, wherein the steel is alloyed steel.

3. The plunger according to claim 1, wherein the steel is selected from the group comprising AISI H13 steel, DIN 34CrAlNi 7 steel, SAE-AISI 4000 series steel or equivalents thereof.

4. The plunger according to claim 3, wherein the SAE-AISI 4000 series steel is a SAE-AISI 4140 steel.

5. The plunger according to claim 2, wherein the alloyed steel is a quenched and tempered steel.

6. The plunger according to claim 5, wherein the alloyed steel is a steel quenched and subjected to a double-tempering treatment.

7. The plunger according to claim 1, wherein the plunger is further subjected to physical vapor deposition (PVD) surface treatment.

8. The plunger according to claim 7, wherein the PVD coating is about 5 μ

m thick.

9. The plunger according to claim 7, wherein the PVD coating is a monolayer coating of elements selected from the group comprising Al, Cr and Ni.

18. The plunger according to claim 2, wherein the steel is selected from the group comprising AISI H13 steel, DIN 34CrAlNi 7 steel, SAE-AISI 4000 series steel or equivalents thereof.

19. The plunger according to claim 8, wherein the PVD coating is a monolayer coating of elements selected from the group comprising Al, Cr and Ni.

10. A method for manufacturing a plunger for a hydraulic fracturing pump, where the method comprises carrying out a surface treatment of a steel plunger by means of an ion nitriding process.

11. The method according to claim 10 wherein the steel plunger is made of alloyed steel.

12. The method according to claim 11 wherein the alloyed steel is selected from the group comprising AISI H13 steel, DIN 34CrAlNi 7steel, SAE-AISI 4000 series steel or equivalents thereof.

13. The method according to claim 12, wherein the SAE-AISI 4000 series steel is a SAE-AISI 4140 steel.

14. The method according to anyone of claim 10 wherein the alloyed steel plunger is further subjected to a double-tempering treatment.

15. The method according to anyone of claim 10 wherein following the ion nitriding process, the piston is subjected to a PVD surface treatment.

16. The method according to claim 15 wherein the PVD coating is about 5 μ

m thick.

17. The method according to claim 15 wherein the PVD coating is a monolayer coating of elements selected from the group comprising Al, Cr and Ni.

20. The method according to claim 16 wherein the PVD coating is a monolayer coating of elements selected from the group comprising Al, Cr and Ni.