JED-723

JED-723 : 2007-05 Page 2

4 Properties

4.1 Mechanical properties

The mechanical properties of the parts must be according to the heat treatment required in the corresponding drawing. If no requirements are indicated in the drawing, the following requirements have to be fulfilled.

JED-723-0

relevant cross-section = 16 mm >16 = 40 mm > 40 = 100 mm

Tensile strength (ISO6892): 1000 to1200 900 to 1100 800 to 950 N/mm2 Yield strength (ISO6892): > 800 > 660 > 560 N/mm2 Elongation at break (ISO6892): > 10 > 12 > 14 % Notched-impact strength (ISO 148): - > 35 > 35 J

Limits of Rockwell C hardness for the test of hardenability in the end quench test

JED-723-1

relevant cross-section = 16 mm >16 = 40 mm > 40 = 100 mm

Tensile strength (ISO6892): 1200 to 1400 1100 to 1300 1000 to 1200 N/mm2 Yield strength (ISO6892): > 1000 > 900 > 800 N/mm2 Elongation at break (ISO6892): > 9 > 10 > 11 % Notched-impact strength (ISO 148): - > 45 > 45 J

WABCO Specification

JED-723 : 2007-05 Page 3

Limits of Rockwell C hardness for the test of hardenability in the end quench test

JED-723-2

relevant cross-section = 16 mm >16 = 40 mm

Tensile strength (ISO6892): 950 bis 1150 800 bis 950 N/mm2

Yield strength (ISO6892): > 800 > 650 N/mm2 Elongation at break (ISO6892): > 13 > 13 %

Notched-impact strength (ISO 148): - > 60 J

WABCO Specification

JED-723 : 2007-05 Page 4

Limits of Rockwell C hardness for the test of hardenability in the end quench test

4.2 Chemical composition [%]

JED-723-0 JED-723-1 JED-723-2

Carbon (C): 0,37 to 0,45 0,30 to 0,39 0,27 to 0,33

Silicon (Si): max. 0,40 max. 0,40 max. 0,40

Manganese (Mn): 0,55 to 0,90 0,50 to 0,80 1,15 to 1,45

Phosphorus (P): max. 0,035 max. 0,035 max. 0,025

Sulphur (S): max. 0,035 max. 0,035 max. 0,035

Chromium (Cr): 0,70 to 1,25 1,30 to 1,70 -

Nickel (Ni): - 1,30 to 1,70 -

Molybdenum (Mo): - 0,15 to 0,30 -

Copper (Cu): - - -

Boron (B): - - 0,0008 to 0,005

4.3 Further properties

Parts made from steels according to JED-697-0 and JED-697-2 must be suited for resistance welding.

5 Conditions of delivery

The material and the finished parts must correspond to the technical conditions of delivery defined in JED-622.

WABCO Specification