Datasheet

1.4564

AISI 631

Brand name	17-7PH®

Standards

Material No.

1.4564

EN Designation

X7CrNiAl17-7

AISI/SAE

631

UNS

S17700

Description	1.4564 / 17-7PH® is an austenitic chromium-nickel stainless steel with aluminum addition.

Special properties	Excellent fatigue properties, good corrosion resistance, good formability and minimum distortion upon heat treatment. It is easily formed in the annealed condition, hardened to high strength levels by heat treatments to condition CH900, RH950 or TH1050. The exceptional high strength of condition CH900 offers many new advantages where limited ductility and workability are permissible. In its heat treated condition, this alloy provides exceptional mechanical properties at temperatures up to 480 °C.

Special properties

Excellent fatigue properties, good corrosion resistance, good formability and minimum distortion upon heat treatment. It is easily formed in the annealed condition, hardened to high strength levels by heat treatments to condition CH900, RH950 or TH1050. The exceptional high strength of condition CH900 offers many new advantages where limited ductility and workability are permissible. In its heat treated condition, this alloy provides exceptional mechanical properties at temperatures up to 480 °C.

Chemical Composition

C
%

≤ 0.09

Si
≤ %

1.00

Mn
≤ %

1.00

P
≤ %

0.04

S
≤ %

0.03

Cr
%

16.0-18.0

Ni
%

6.50-7.75

Cu
%

≤ 0.50

Al
%

0.75-1.50

Mechanical Properties 20°C

Hardness HB 30
≤ HB

230

0.2% Yield strength R_p
≥ N/mm²

280

Tensile strength R_m
N/mm²

900-1100

Elongation A₅
≥ %

Modulus of elasticity
kN/mm²

200

Physical Properties 20°C

Density
g/cm³

7.81

Thermal conductivity
W/m K

Electrical resistivity
Ω mm²/m

0.8

Suitable welding filler materials	1.4564

Application	Aircraft industry, high strenght corrosion resistant parts

Available forms for 1.4564 / AISI 631

Sheets/Plates

Bars

Wire

Forged / cast parts

Finished part (drawing)