# US 10,870,900 B2 · High toughness martensitic stainless steel and reciprocating pump manufactured therewith

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,870,900 B2
- Document ID: US10870900B2
- Status: Granted
- Kind: B2
- Application number: 15/872,531
- Filed: 2018-01-16
- Published: 2018-12-13
- Granted: 2020-12-22
- Earliest claimed: 2017-06-07
- Assignees: A. Finkl & Sons Co.
- Applicants: A. Finkl & Sons Co.
- Inventors: Algirdas Underys; Louis-Philippe Lapierre
- Web page: https://patentgrep.com/patent/US10870900B2

## CPC

- C21D 6/008: {containing Si}
- C21D 1/18: Hardening (C21D1/02 takes precedence); Quenching with or without subsequent tempering (quenching devices C21D1/62)
- C21D 1/25: Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
- C21D 6/004: {containing Cr and Ni}
- C21D 6/005: {containing Mn}
- C21D 9/00: Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D 9/0068: {for particular articles not mentioned below}
- C22C 38/002: {containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60}
- C22C 38/02: containing silicon
- C22C 38/04: containing manganese
- C22C 38/06: containing aluminium
- C22C 38/44: with molybdenum or tungsten
- C22C 38/46: with vanadium
- C22C 38/48: with niobium or tantalum
- F04B 1/0421: Cylinders
- F04B 15/02: the fluids being viscous or non-homogeneous
- F04B 53/007: {Cylinder heads}
- F04B 53/16: Casings; Cylinders; Cylinder liners or heads; Fluid connections
- C21D 2211/008: Martensite
- F04B 9/045: {the means being eccentrics}
- F04B 35/01: the means being mechanical
- F04B 39/0094: {crankshaft}
- F04B 39/122: {Cylinder block}
- F04B 53/006: {Crankshafts}
- F04B 53/14: Pistons, piston-rods or piston-rod connections
- F05C 2201/046: Stainless steel or inox, e.g. 18-8
- F16H 21/18: Crank gearings; Eccentric gearings
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)
- F05C: INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F16H: GEARING

## Abstract

A reciprocating pump is disclosed. The reciprocating pump may comprise a power end, and a fluid end operatively connected to the power end. The fluid end may include a plunger, a cylinder configured to operatively engage the plunger, and an end block. The plunger, the cylinder, and the end block of the fluid end may each be fabricated from a high toughness martensitic stainless steel composition comprising between 11.50% and 17.00% by weight chromium, between 3.50% and 6.00% by weight nickel, between 0.30% and 1.50% by weight molybdenum, between 0.01% and 0.20% by weight vanadium, and iron.

## Claims

### Claim 1

A reciprocating pump, comprising:
a power end having a motor, a crankshaft rotationally engaged with the motor, and a crank arm rotationally engaged with the crankshaft; and
a fluid end operatively connected to the power end and including a plunger, a cylinder configured to operatively engage the plunger, and an end block, the plunger, the cylinder, and the end block each being fabricated from a high toughness martensitic stainless steel composition comprising between 11.50% and 17.00% by weight chromium, between 3.50% and 6.00% by weight nickel, between 0.30% and 1.50% by weight molybdenum, between 0.01% and 0.20% by weight vanadium, and iron.

### Claim 2 (depends on 1)

The reciprocating pump of claim 1, wherein the high toughness martensitic stainless steel composition further comprises between 0.00% and 0.20% by weight niobium.

### Claim 3 (depends on 2)

The reciprocating pump of claim 2, wherein the high toughness martensitic stainless steel composition further comprises between 0.00% and 0.06% by weight carbon.

### Claim 4 (depends on 3)

The reciprocating pump of claim 3, wherein a ratio of niobium to carbon in the high toughness martensitic stainless steel composition is 6 or less.

### Claim 5 (depends on 4)

The reciprocating pump of claim 4, wherein the high toughness martensitic stainless steel composition further comprises:
between 0.00% and 1.50% by weight manganese;
between 0.00% and 0.040% by weight phosphorus,
between 0.00% and 0.030% by weight sulfur;
between 0.00% and 0.70% by weight silicon; and
between 0.000% and 0.060% by weight aluminum.

### Claim 6 (depends on 5)

The reciprocating pump of claim 5, wherein the high toughness martensitic stainless steel composition comprises between 12.00% and 14.00% by weight chromium, between 3.50% and 5.50% by weight nickel, between 0.50% and 1.00% by weight molybdenum, and between 0.01% and 0.15% by weight vanadium.

### Claim 7 (depends on 6)

The reciprocating pump of claim 6, wherein the high toughness martensitic stainless steel composition comprises between 0.00% and 0.15% by weight niobium.

### Claim 8 (depends on 7)

The reciprocating pump of claim 7, wherein the ratio of niobium to carbon in the high toughness martensitic stainless steel composition is 4 or less.

### Claim 9 (depends on 8)

The reciprocating pump of claim 8, wherein the high toughness martensitic stainless steel composition comprises:
between 0.50% to less than 1.00% by weight manganese;
between 0.00% to 0.030% by weight phosphorus;
between 0.00% to 0.60% by weight silicon; and
between 0.000% and 0.060% by weight aluminum.

### Claim 10

An end block of a reciprocating pump, comprising:
a body;
a first bore extending through the body between an inlet port and an outlet port;
a cylinder bore extending through the body between a cylinder port and the first bore, the body of the end block being fabricated from a high toughness martensitic stainless steel composition comprising between 0.00% and 0.06% by weight carbon, between 11.50% and 17.00% by weight chromium, between 3.50% and 6.00% by weight nickel, between 0.30% and 1.50% by weight molybdenum, between 0.01% and 0.20% by weight vanadium, and iron.

### Claim 11 (depends on 10)

The end block of claim 10, wherein the high toughness martensitic stainless steel composition further comprises:
between 0.00% and 1.50% by weight manganese;
between 0.00% and 0.040% by weight phosphorus;
between 0.00% and 0.030% by weight sulfur;
between 0.00% and 0.70% by weight silicon; and
between 0.000% and 0.060% by weight aluminum.

### Claim 12 (depends on 11)

The end block of claim 11, wherein the high toughness martensitic stainless steel composition further comprises up to 0.20% by weight niobium.

### Claim 13 (depends on 12)

The end block of claim 12, wherein the high toughness martensitic stainless steel composition comprises between 12.00% and 14.00% by weight chromium, between 3.50% and 5.50% by weight nickel, between 0.50% and 1.00% by weight molybdenum, and between 0.01% and 0.15% by weight vanadium.

### Claim 14 (depends on 13)

The end block of claim 13, wherein the high toughness martensitic stainless steel composition comprises:
between 0.50% and 1.00% by weight manganese;
between 0.00% and 0.030% by weight phosphorus;
between 0.00% and 0.60% by weight silicon; and
between 0.000% and 0.060% by weight aluminum.

### Claim 15 (depends on 14)

The end block of claim 14, wherein the high toughness martensitic stainless steel comprises up to 0.15% by weight niobium.

### Claim 16

A high toughness martensitic stainless steel composition, comprising:
between 0.00% and 0.06% by weight carbon;
between 0.00% and 1.50% by weight manganese;
between 0.00% and 0.040% by weight phosphorus;
between 0.00% and 0.030% by weight sulfur;
between 0.00% and 0.70% by weight silicon;
between 11.50% and 17.00% by weight chromium;
between 3.50% and 6.00% by weight nickel;
between 0.30% and 1.50% by weight molybdenum;
between 0.01% and 0.20% by weight vanadium;
between 0.000% and 0.060% by weight aluminum;
between 0.00% and 0.20% by weight niobium,
a ratio of niobium to carbon being 6 or less; and
iron.

### Claim 17 (depends on 16)

The high toughness martensitic stainless steel composition of claim 16, wherein the high toughness martensitic stainless steel composition comprises:
between 0.50% and 1.00% by weight manganese;
between 0.00% and 0.030% by weight phosphorous;
between 0.00% and 0.60% by weight silicon;
between 12.00% and 14.00% by weight chromium;
between 3.50% and 5.50% by weight nickel;
between 0.50% and 1.00% by weight molybdenum;
between 0.01% and 0.15% by weight vanadium; and
between 0.00% and 0.15% by weight niobium,
the ratio of niobium to carbon being 4 or less.