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Hardenable manganese-boron steel – good forming properties and high strength for precision steel tubes

Precision steel tube made of manganese-boron steel for stabilizers in automotive engineering

Manganese-boron steels made by thyssenkrupp are delivered with excellent forming properties and are used among other things for the production of precision steel tubes.

MnB steels are characterized by high strength and homogeneity of mechanical properties after quenching and termpering. The good strength properties are obtained by carbon and manganese and by a small boron content. Segregation-optimized MnB steels with even greater strength and enhanced ductility in the quenching and temping are being developed or already part of our product range. Our range of products includes MnB alloyed steels in accordance with DIN EN ISO 683-2 (previously DIN EN 10083-3).

thyssenkrupp supplies the steel grades as per the product information or the reference steel grades in accordance with the respective standards.

Manganese-boron steel according to DIN EN ISO 683-2 (previously DIN EN 10083-3)

Steel grade designation Reference grade Material no. THICKNESS1
from _ to in mm
WIDTH1
from _ to in mm
20MnB5 20MnB5 1.5530 2.00 – 13.00 70 – 1,630
30MnB5 30MnB5 1.5531 2.00 – 13.00 70 – 1,630
39MnB5 389MnB5 1.5532 2.00 – 13.00 70 – 1,630
27MnCrB5-2 27MnCrB5-2 1.7182 2.00 – 13.00 70 – 1,630
33MnCrB5-2 33MnCrB5-2 1.7185 2.00 – 13.00 70 – 1,630
39MnCrB6-2 39MnCrB6-2 1.7189 2.00 – 13.00 70 – 1,630
1. Not all thickness and width combinations possible.

Chemical composition

Steel grade C [%]
Si [%]
max.
Mn [%]
P [%]
max.
S [%]
max.
Cr [%]
Mo [%] ­max. / - B [ppm]
20MnB5 0.17 – 0.23 0.40 1.10 – 1.40 0.025 0.010 0.10 8 – 50
30MnB5 0.27 – 0.33 0.40 1.15 – 1.45 0.025 0.010 - 0.10 8 – 50
39MnB5 0.36 – 0.42 0.40 1.15 – 1.45 0.025 0.010 - 0.10 8 – 50
27MnCrB5-2 0.24 – 0.30 0.40 1.10 – 1.40 0.025 0.010 0.30 – 0.60 0.10 8 – 50
33MnCrB5-2 0.30 – 0.36 0.40 1.20 – 1.50 0.025 0.010 0.30 – 0.60 0.10 8 – 50
39MnCrB6-2 0.36 – 0.42 0.40 1.40 – 1.70 0.025 0.010 0.30 – 0.60 0.10 8 – 50
Mass fractions in ladle analysis.
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