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17-4PH

17-4PH, 630, S17400, 1.4542, X5CrNiCuNb16-4, 05Cr17Ni4Cu4Nb

17-4 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. Thesteelshould not be used in the solution treated (annealed) condition.

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. 17-4PHcorrosion resistance can be affected by surface finish and precipitation hardening heat treatment.

17-4PH isused for applications requiring high strength and a moderate level of corrosion resistance. High strength is maintained to approximately 600°F (316°C).

Thesteelshould 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.

Tests have shown that the corrosion resistance of 17-4 Precipitation Hardeningsteelis 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.

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

17-4PHis martensitic structure in the annealed condition and is further strengthened by a low temperature treatment which precipitates a copper containing phase in thesteel. In comparison to manysteelsin the precipitation hardening family,17-4PHrequires 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 ofsteellike S17700 or S15700. The latter precipitation hardeningsteels generally require more steps to complete heat treatment.

(1)Hot formed, descaled

(2)Cold worked

(3)Cold worked and solution annealed

Chemical composition

Tension

Hardness

Micro structure

Eddy current

Surface condition

Shape and dimension

Positive Material Identification