Boron steels for quenching and tempering
Characteristics
Boron steels are characterized by very good formability in hot rolled state and very high strength after quenching and tempering. Boron as an alloying element effectively increases hardenability of steel.
Boron steels are under development. Orders are subject to prior agreement.
Applications of boron steels
Agriculture: products which require very good wear resistance and high strength i.e. components of agricultural machinery.
Automotive: tubular stabilizer bars, hot forming applications
TECHNICAL SPECIFICATION
CHEMICAL COMPOSITION
| Grades according to EN10083-3 U.S.Steel Košice s.r.o | Heat analyses in weight % | |||||||
|---|---|---|---|---|---|---|---|---|
| C | SiMAX | Mn | PMAX | SMAX | Cr | Ti | B | |
| 26MnB5a) | 0.23 - 0.29 | 0.4 | 1.10 - 1.40 | 0.025 | 0.035 | 0.10 - 0.40 | 0.01 - 0.06 | 0.0008 - 0.0050 |
| 34MnB5a) | 0.32 - 0.37 | 0.4 | 1.15 - 1.45 | 0.025 | 0.035 | 0.10 - 0.40 | 0.01 - 0.06 | 0.0008 - 0.0050 |
|
27CrMnB5-2 |
0.24 - 0.30 | 0.4 | 1.10 - 1.40 | 0.025 | 0.035 | 0.30 - 0.60 | 0.01 - 0.06 | 0.0008 - 0.0050 |
a) Grades are modification of 20MnB5 and 30MnB5 according to EN10083-3
PRODUCTION PROGRAM
26MnB5
| min. thickness [mm] | max. thickness [mm] | max. width [mm] |
| 3 | 3.49 | 1000 |
| 3.5 | 3.99 | 1100 |
| 4 | 4.49 | 1240 |
| 4.5 | 4.99 | 1290 |
| 5 | 5.99 | 1340 |
| 6 | 12.5 | 1547 |
Boron steels are under development.
Grades and dimensions are subject to mutual agreement.
surface treatment
- pickled, non-pickled coil
- pickled max. thickness 4.2 mm, higher thicknesses upon agreement
dimensional tolerance
- EN10029 or EN10051 (according to EN 10083-1 Annex D)
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