Plunger with ion nitriding treatment for a hydraulic fracturing pump and a method for making said plunger

Patent metadata

Field	Value
Publication number	US-10260630-B2
Application number	US-201615273219-A
Country	US
Kind code	B2
Filing date	Sep 22, 2016
Priority date	Sep 22, 2015
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

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.

First claim

The invention claimed is:

1. A plunger for a hydraulic fracturing pump, wherein the plunger is a steel plunger treated with an ion nitriding process, wherein the steel is selected from the group comprising AISI H13 steel, DIN 34CrAlNi 7 steel, SAE-AISI 4000 series steel or an equivalent alloyed steel having at least molybdenum.

2. The plunger according to claim 1 , wherein the SAE-AISI 4000 series steel is a SAE-AISI 4140 steel.

3. The plunger according to claim 1 , wherein the steel is a quenched and tempered steel.

4. The plunger according to claim 1 , wherein the steel is quenched and subjected to a double-tempering treatment.

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

6. The plunger according to claim 5 , wherein the PVD coating is about 5 μm thick.

7. The plunger according to claim 6 , wherein the PVD coating is a monolayer coating of elements selected from the group comprising Al, Cr and Ni.

8. The plunger according to claim 5 , wherein the PVD coating is a monolayer coating of elements selected from the group comprising Al, Cr and Ni.

9. 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, wherein the steel is selected from the group comprising AISI H13 steel, DIN 34CrAlNi 7 steel, SAE-AISI 4000 series steel or an equivalent alloyed steel having at least molybdenum.

10. The method according to claim 9 , wherein the SAE-AISI 4000 series steel is a SAE-AISI 4140 steel.

11. The method according to claim 9 wherein the steel plunger is further subjected to a double-tempering treatment.

12. The method according to claim 9 wherein following the ion nitriding process, the piston is subjected to a PVD surface treatment.

13. The method according to claim 12 wherein the PVD coating is about 5 μm thick.

14. The method according to claim 13 wherein the PVD coating is a monolayer coating of elements selected from the group comprising Al, Cr and Ni.

15. The method according to claim 12 wherein the PVD coating is a monolayer coating of elements selected from the group comprising Al, Cr and Ni.

Assignees

• Ypf Tecnologia Sa
• Ionar Sa

Inventors

• Carfi Guillermo Rodolfo
• Cirimello Pablo Gabriel
• Cabo Amado

Classifications

• F16J1/001

  One-piece pistons · CPC title

• C21D9/0068

  for particular articles not mentioned below · CPC title

• C21D1/18

  Hardening (C21D1/02 takes precedence); Quenching with or without subsequent tempering (quenching devices C21D1/62) · CPC title

• F04B15/02

  the fluids being viscous or non-homogeneous · CPC title

• F04B53/14

  Pistons, piston-rods or piston-rod connections · CPC title