Premium material for lightweight automotive manufacturing: tubor® – our application-optimized MnB steel for the production of precision steel tubes
Owing to their excellent forming behavior, steels of the tubor® range are very well suited for welded, cold-rolled or cold-drawn precision steel tubes. The material features a homogeneous and fine-grained microstructure with a low sulfur and phosphor content. Segregations in the microstructure are significantly reduced by means of special technical processes. Thanks to the combination of an optimized manufacturing process on the one hand and chemical analysis attuned to the end application on the other, the tubor® steel grades offer greater strength and a improved ductility after quenching and tempering.
Application examples of precision steel tubes made of MnB steels
In automotive manufacturing, precision steel tubes offer great potential for cost and weight reduction and are used among other things for stabilizers, piston rods in shock absorbers or driving shafts and camshafts.
thyssenkrupp supplies the steel grades as per the product information or the reference steel grades in accordance with the respective standards.
tubor® – special MnB steels for precision steel tubes
| Steel grade designation | Standard designation1 | THICKNESS2 from _ to in mm |
WIDTH2 max. mm |
|---|---|---|---|
| tubor® 26 | 26MnB5 | 1.95 – 13.00 | 2,030 |
| tubor® 34 | 34MnB5 | 1.75 – 18.00 | 1,630 |
Chemical composition
| Steel grade | C [%] |
Si [%] max. |
Mn [%] | P [%] max. |
S [%] max. |
Al [%] | Cr [%] | Ti [%] | B [ppm] |
|---|---|---|---|---|---|---|---|---|---|
| tubor® 26 | 0.23 – 0.27 | 0.15 – 0.35 | 1.15 – 1.40 | 0.020 | 0.006 | 0.015 – 0.055 | 0.05 – 0.20 | 0.015 – 0.045 | 15 – 40 |
| tubor® 34 | 0.33 – 0.37 | 0.15 – 0.35 | 1.15 – 1.40 | 0.020 | 0.006 | 0.015 – 0.055 | 0.05 – 0.20 | 0.020 – 0.050 | 15 – 40 |
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 |
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 | 1.10 – 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 |
