Innovations in boron steel for high-strength and cost-effective applications
Ovako has a history of pioneering the innovative use of boron steel and constant development has resulted in the wide range of variants we provide today. Boron is a small interstitial element which is added to improve hardenability. It most effective in lower and medium carbon grades with < 0.40% C where it increases the strength of heat-treated steels in the quenched and tempered condition.
Boron steel grades can be hot worked and direct quenched to achieve a high strength component. They are often a very cost-effective solution in applications subjected to wear, as well as in cases that place major demands on construction materials such as military projectiles.
Why boron steel ensures safer, stronger, and more durable wrecking bars
As a company that places a premium on quality and end-user safety, Hultafors has been using Ovako high-alloy boron steel for the past 25 years to manufacture its wrecking bars. Lennart Jansson, Product Manager at Hultafors, says: “The claw of our wrecking bars is the thinnest on the market to enable easy access to narrow spaces." But because of boron steel’s ultra-high strength and durability, it will never break when over-stressed, making it much safer than other bars. It might bend slightly. In contrast, our competitors’ bars have much thicker claws, but can snap without warning, as revealed in our stress-testing program.
|
EN-standard |
Ovako |
Typical analysis |
||||||
|
|
|
C |
Si |
Mn |
Cr |
Mo |
Ni |
Other |
|
20MnB4 |
0.20 |
0.2 |
1.3 |
|
|
|
B |
|
|
22MnB5 |
0.24 |
0.3 |
1.3 |
0.2 |
|
|
B |
|
|
30MnB5 |
SB33M13B, BM 312 |
0.30 |
0.2 |
1.3 |
|
|
|
B |
|
43MnB5-3* |
0.42 |
0.3 |
1.4 |
|
|
|
B |
|
|
27MnCrB5-2 |
0.27 |
0.2 |
1.3 |
0.5 |
|
|
B |
|
|
33MnCrB5-2 |
0.32 |
0.3 |
1.3 |
0.6 |
|
|
B |
|
|
39MnCrB6-4 |
0.39 |
0.3 |
1.5 |
0.5 |
|
|
B |
|
EN-standard designation followed by “*” is not an official EN standard grade but named according to the rules in EN 10027.
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