ENAO module

Group number

Sub group

Properties, requirements

1

Steels with a specified minimum yield strength ReH ≤ 460 N/mm²
C ≤ 0,25% Si ≤ 0,60% Mn ≤ 1,70% Mo ≤ 0,70% S ≤ 0,045% P ≤ 0,045% Cu ≤ 0,40% Ni ≤ 0,5%
Cr ≤ 0,3% Nb ≤ 0,05% V ≤ 0,12% Ti ≤ 0,05%

1.1

Steels with a specified minimum yield strength ReH ≤ 275 N/mm²

1.2

Steels with a specified minimum yield strength 275 N/mm² < ReH ≤ 360 N/mm²

1.3

Normalised fine grain steels with a specified minimum yield strength ReH > 360 N/mm²

1.4

Steels with improved atmospheric corrosion resistance whose analysis may exceed the requirements for the single elements as indicated under 1

2

Thermomechanically treated fine grain steels and cast steels with a specified minimum yield strength ReH > 360 N/mm²

2.1

Thermomechanically treated fine grain steels and cast steels with a specified minimum yield strength 360 N/mm² < ReH ≤ 460 N/mm²

2.2

Thermomechanically treated fine grain steels and cast steels with a specified minimum yield strength ReH > 460 N/mm²

3

Quenched and tempered steels and precipitation hardened steels except stainless steels with a specified minimum yield strength ReH > 360 N/mm²

3.1

Quenched and tempered steels with a specified minimum yield strength 360 N/mm² < ReH ≤ 690 N/mm²

3.2

Quenched and tempered steels with a specified minimum yield strength ReH > 690 N/mm²

3.3

Precipitation hardened steels except stainless steels

4

Low vanadium alloyed Cr-Mo-(Ni) steels with Mo ≤ 0,7 % and V ≤ 0,1 %

4.1

Steels with Cr ≤ 0,3 % and Ni ≤ 0,7 %

4.2

Steels with Cr ≤ 0,7 % and Ni ≤ 1,5 %

Group number

Sub-
group

Properties, requirements

5

Cr-Mo steels free of vanadium with C ≤ 0,35 %c

5.1

Steels with 0,75 % ≤ Cr ≤ 1,5 % and Mo ≤ 0,7 %

5.2

Steels with 1,5 % < Cr ≤ 3,5 % and 0,7 < Mo ≤ 1,2 %

5.3

Steels with 3,5 % < Cr ≤ 7,0 % and 0,4 < Mo ≤ 0,7 %

5.4

Steels with 7,0 % < Cr ≤ 10 % and 0,7 < Mo ≤ 1,2 %

6

High vanadium alloyed Cr-Mo-(Ni) steels

6.1

Steels with 0,3 % ≤ Cr ≤ 0,75 %, Mo ≤ 0,7 % and V ≤ 0,35 %

6.2

Steels with 0,75 % < Cr ≤ 3,5 %, 0,7 % < Mo ≤ 1,2 % and V ≤ 0,35 %

6.3

Steels with 3,5 % < Cr ≤ 7,0 %, Mo ≤ 0,7 % and 0,45 % ≤ V ≤ 0,55 %

6.4

Steels with 7,0 % < Cr ≤ 12,5 %, 0,7 % < Mo ≤ 1,2 % and V ≤ 0,35 %

7

Ferritic, martensitic or precipitation hardened stainless steels with C ≤ 0,35 % and
10,5 % ≤ Cr ≤ 30 %

7.1

Ferritic stainless steels

7.2

Martensitic stainless steels

7.3

Precipitation hardened stainless steels

8

Austenitic steels, Ni ≤ 35 %

8.1

Austenitic stainless steels with Cr ≤ 19 %

8.2

Austenitic stainless steels with Cr > 19 %

8.3

Manganese austenitic stainless steels with 4 % < Mn ≤ 12 %