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┃ Material
17-4PH, 630, S17400, 1.4542, X5CrNiCuNb16-4, 05Cr17Ni4Cu4Nb
┃ Overview
17-4PH Stainless is a martensitic chromium-nickel-copper stainless steel in the solution treated (annealed) condition. It can be further hardened to various strength levels by a single precipitation hardening heat treatment that minimizes scaling and distortion. Its strength and moderate corrosion resistant properties are maintained in service temperatures up to the 600° F to 800° F range. The steel should not be used in the solution treated (annealed) condition.
┃ Characteristics
17-4PH exhibits superior corrosion resistance compared to hardenable 400-Series Stainless chromium grades such as Type 410 Stainless. It is nearly comparable that of 300-Series Stainless chromium nickel grades such as Type 304 Stainless. 17-4PH corrosion resistance can be affected by surface finish and precipitation hardening heat treatment.
┃ Application
17-4PH is used for applications requiring high strength and a moderate level of corrosion resistance. High strength is maintained to approximately 600°F (316°C).
The steel should not be used at temperatures above 572°F (300°C) or at very low temperatures. It has adequate resistance to atmospheric corrosion or in diluted acids or salts where its corrosion resistance is equivalent to Alloy 304 or 430.
┃ Chemical composition (wt%)
|
C |
Si |
Mn |
P |
S |
|
≤0.07 |
≤1.0 |
≤1.0 |
≤0.040 |
≤0.030 |
|
Cr |
Ni |
Cu |
Nb (Cb)+Ta |
Mo |
|
15.0~17.5 |
3.0~5.0 |
3.0~5.0 |
5 x C ~0.45 |
≤0.50 |
┃ Corrosion resistance
Tests have shown that the corrosion resistance of 17-4 Precipitation Hardening steel is comparable to that of Type 304 stainless steel in most media. In general, the corrosion resistance of 17-4 alloy is superior to that of the hardenable 400 series stainless steels.
┃ Mechanical property (AMS 5604)
Annealed condition
Ultimate Tensile Strength: 185 KSI min (1255 MPa min)
Yield Strength(0.2% Offset): 160 KSI min(1105 MPa min)
Elongation: 3% min
Hardness: 38HRC max.
H1150
Ultimate Tensile Strength: 135 KSl min (930 MPa min)
Yield Strength: 105 KSl min (725 MPa min)
Elongation: 8%min
Hardness: 28-37HRC
┃ Heat treatment
17-4PH is martensitic structure in the annealed condition and is further strengthened by a low temperature treatment which precipitates a copper containing phase in the steel. In comparison to many steels in the precipitation hardening family, 17-4PH requires a simple heat treatment; a one step process conducted at a temperature in the range 900°F (482°C) to 1150°F (621°C) depending on the combination of strength and toughness desired. A wide range of properties can be produced by this one step heat treatment. Heat treatment in the 900°F (482°C) range produces highest strength, although slightly less than that of steel like S17700 or S15700. The latter precipitation hardening steels generally require more steps to complete heat treatment.
┃ Available Process
(1) Hot formed, descaled
(2) Cold worked
(3) Cold worked and solution annealed
┃ Common Tests
Chemical composition
Tension
Hardness
Micro structure
Eddy current
Surface condition
Shape and dimension
Positive Material Identification
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