Introduction Of 17-4ph Stainless Steel

17-4 stainless steel plate ( 630 ) is a chromium-copper precipitation hardening stainless steel material used for applications requiring high strength and a moderate level of corrosion resistance. High strength is
maintained to approximately 600 degrees Fahrenheit (316 degrees
Celsius).

General Properties

Stainless steel Alloy 17-4 PH is a precipitation hardening martensitic stainless steel with Cu and Nb/Cb additions. The grade combines high strength, hardness (up to 572°F / 300°C), and corrosion
resistance.

Chemistry Data

Carbon	0.07 max
Chromium	15 – 17.5
Copper	3 – 5
Iron	Balance
Manganese	1 max
Nickel	3 – 5
Niobium	0.15 – 0.45
Niobium+Tantalum	0.15 – 0.45
Phosphorus	0.04 max
Silicon	1 max
Sulphur	0.03 max

Corrosion Resistance

Alloy 17-4 PH withstands corrosive attacks better than any of the standard hardenable stainless steels and is comparable to Alloy 304 in most media.

If there are potential risks of stress corrosion cracking, the higher aging temperatures then must be selected over 1022°F (550°C), preferably 1094°F (590°C). 1022°F (550°C) is the optimum tempering temperature in chloride media.

1094°F (590°C) is the optimum tempering temperature in H2S media.

The alloy is subject to crevice or pitting attack if exposed to stagnant seawater for any length of time.

It is corrosion resistant in some chemical, petroleum, paper, dairy and food processing industries (equivalent to 304L grade).

Applications

· Offshore (foils, helicopter deck platforms, etc.)· Food industry· Pulp and paper industry· Aerospace (turbine blades, etc.)· Mechanical components · Nuclear waste casks

Standards

· ASTM A693 grade 630 (AMS 5604B) UNS S17400· EURONORM 1.4542 X5CrNiCuNb 16-4· AFNOR Z5 CNU 17-4PH· DIN 1.4542