17-4 PH H1025 Precipitation Hardening Stainless Steel

What are 17-4 H1025 Stainless Steels? Grade 17-4 stainless steel is the utmost extensively applied steel of the precipitation hardening grade steels. It has great toughness, high strength, and normal corrosion resistance. Precipitation hardening, also known as age hardening, is a heat treatment method utilized to augment the yield strength of this grade. H1025 is the heat treatment condition. The extraordinary ultimate strengths of precipitation hardening steels are a result of a heat treatment process. The heat treatment process transforms martensite or austenite matrix into precipitation hardening. Hardening is achieved through the accumulation of one or more of the components Titanium, Niobium, and Molybdenum.


Dimensional Characteristics of 17-4 H1025 Stainless Steels: The applicable thickness in millimeters for this 17-4 H1025 Stainless Steels ranges from 0.35 to 3.2 whereas the width in millimeters is from 600 to 1200, also available in various slit forms of varying width as per customer demands.


Available Forms in Market: Following are the available forms of 17-4 H1025 Stainless Steels:

  • Bars, Rings, Tubing & Forgings
  • Plate , Strip & Sheet
  • Bars, Shapes and Wire
  • Coils

The Chemical Composition of 17-4 H1025 Stainless Steels: Chemical alloying compositions are explicated below

  • Maximum percentage of Carbon as defined in the standard is 0.07
  • Maximum percentage of Manganese as defined in the standard is 1
  • Maximum percentage of Phosphorus & Sulphur as defined in the standard is 0.0717-4-ph-stainless-composition
  • Maximum percentage of Copper, columbium and Tantalum as defined in the standard is 5.45
  • Maximum percentage of Silicon as defined in the standard is 1
  • Maximum percentage of Nickel as defined in the standard is 5
  • Maximum percentage of Chromium as defined in the standard is 17.5 whereas Minimum percentage of Chromium as defined in the standard is 15

Spotlight: The best recognized precipitation hardening steel is 17-4 PH. The grade name stems from the inclusions of seventeen percent Chromium and four percent Nickel. It also comprises four percent Copper and three tenth percent Niobium. 17-4 PH is also recognized as stainless steel grade 630. Due to this chemical combination, PH steel has both qualities of martensite and austenite. Like martensitic grades, they are recognized for their capability to achieve high strength by heat treatment and they also have the corrosion protection one of main quality of austenitic stainless steel. The benefit of precipitation hardening steels is that these can be delivered in a “solution treated” state, which is freely machinable. Subsequent to machining or alternative fabrication technique, low temperature heat process can be implemented to upturn the strength of the steel. This is recognized as age-hardening and also known as ageing. As it is done at minimized temperature, the part experiences no alteration.


Mechanical Properties of 17-4 H1025 Stainless Steels: Mechanical properties are as under

  • Hardness in HB as specified in technical sources is around 363.
  • Tensile strength starts from 1276 Mpa in some technical sources.
  • Yield strength starts from 1170 Mpa in some technical sources.
  • Elongation is 8% in 2 inch.

Equivalent Materials of 17-4 H1025 Stainless Steels: The equivalent materials for 17-4 H1025 Stainless Steels specified in other recognized standards are listed as under

  • In European standard, the equivalent material is referred as X5CrNiCuNb16.4 type steel.
  • In DIN standard, the equivalent material is referred as 1.4542 type steel.
  • In UNS standard, the equivalent material is referred as S17400 type steel.

Industrial Applications of 17-4 H1025 Stainless Steels: These are used in variety of industrial applications including

  • Nuclear waste barrel
  • Parts used in Chemical process
  • Parts used in Mechanical process
  • Aircraft & gas turbines
  • Paper mills & oil fields

Comparative Materials: Some nearly matching materials are discussed below:

  • 304 stainless steels : 304 stainless steel have similar corrosion protection as of 17-4 PH steel. But obviousl the strength of 17-4PH due to heat treatment is higher.
  • 430 stainless steels : 430 stainless steel has higher carbon that 17-4 PH stainless steel, but due to other alloying element in 17-4, and heat treatment process, 17-4 has higher strength & hardness value.

Suppliers List for 17-4 H1025 Stainless Steels : There are many suppliers for this type, some are listed below:

  • Premium supplier name is AK Steel Corporation, Contact information is 800-331-5050 and postal address is 9227 Centre Pointe Drive West Chester, OH 45069.
  • Secondary supplier name is Penn Stainless Products, Contact information is 215-536-3053 and postal address is 190 Kelly Road, Quakertown, PA 18951 .

Note: These values are indicative and for information purpose only. Some of the given information can be outdated. There are also minor possibilities for inaccuracies in the text due to human error. For inaccuracies & outdated text you can e-mail & inform the Content Manager at materialgrades@yahoo.com

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