Dura 17-7PH EN 1.4568, ASTM TYPE 631

Classification :

The 17-7 stainless steel grade is particularly well suited for high strength, corrosion resistant applications.
It performs well at temperatures up to 600ºF.
Fabrication processes are similar to other chromium-nickel stainless steels.

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ASTM TYPE 631

Product information

The typical chemical composition for this grade is given in the table below, together with composition limits given for the product according to different standards. The required standard will be fully met as specified on the order.

17-7PH, AISI 631, X7CRNIAL17-7, 1.4568 - SPECIFICATION AND APPLICATION

Stainless steel from the group of age-hardened PH with the highest content of Chromium - 17% and Nickel - 7% in relation to PH of grades 15-5 and 17-4. It has excellent strength properties, high hardness and elasticity, good corrosion resistance and resistance to high temperatures and deformation.

In terms of chemical composition, the corrosion resistance equals that of AISI 301 / 1.4310 steel, in terms of mechanical properties it is a much better choice for responsible parts and components exposed to fatigue. In the annealed state, the steel has an austenitic structure, after heat treatment of ageing it turns into martensite, increasing its strength properties along with obtaining magnetic properties.

The material is used on valve parts, tanks, springs, spring washers, food knives, diaphragms, low and high temperature parts, heat exchangers, special fittings and installations, machine constructions and components. Steel is intended for the aerospace, petroleum, chemical and petrochemical industries, energy, food and cryogenic industry in the form of strips, wires, sheets and bars.

Technical data

The chemical composition is given as % by mass.

Standard	Grade	C	Mn	Cr	Ni	Mo	N	Other
Typical	1.4568	0.08		17.0	7.0			Al:1.0
EN 10088-2	1.4568	≤0.09	≤1.0	16.0-18.0	6.5-7.8			Al:0.7-1.5
EN 10088-3	1.4568	≤0.09	≤1.0	16.0-18.0	6.5-7.8			Al:0.7-1.5
EN 10088-4	1.4568	≤0.09	≤1.0	16.0-18.0	6.5-7.8			Al:0.7-1.5

andard	Steel Grade
	Chemical composition %
	C:	Mn:	Si:	P:	S:	Cr:	Ni:	Al:
ASTM	17-7PH - 17-7 PH
ASTM	<0.09	<1.0	<0.5	<0.025	<0.025	16.00 - 17.25	6.50 - 7.75	0.75 - 1.25
UNS	S17700 - AMS 5529/5528 - AMS 5644 - AMS 5678
UNS	<0.09	<1.0	<1.0	<0.040	<0.030	16.0 - 18.0	6.5 - 7.7	0.75 - 1.50
EN	X7CrNiAl17-7 - 1.4568
EN	<0.09	<1.0	<0.7	<0.040	<0.015	16.0 - 18.0	6.5 - 8.3	0.7 - 1.5
SUS	SUS 631
SUS	<0.09	<1.0	<1.0	<0.040	<0.030	16.00 - 18.00	6.50 - 7.75	0.75 - 1.50

Standard	Grade	Rp0.2	Rp1.0	Rm	Elongation	Impact strength	Rockwell	HB	HV
		MPa	MPa	MPa	%	J
Product type: Cold rolled coil and sheet
Typical (thickness 1 mm)
EN 10088-2	1.4568			≤ 1030	≥ 19
Product type: Hot rolled coil and sheet
Typical (thickness 4 mm)		330	360	850	37			94
Product type: Hot rolled quarto plate
Typical (thickness 15 mm)		210	240	700	50
Product type: Wire rod
Typical		210	240	700	50

1)Elongation according to EN standard:A80 for thickness below 3 mm.A for thickness = 3 mm.Elongation according to ASTM standard A2” or A50.

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Stainless Steel Coil