Extra high strength steel
The fundamental difference between high-strength and extra-high-strength steels is the difference in microstructure.
Extra high strength steels – save weight without reducing strength
Extra high strength steels are used in structures where weight is to be saved without reducing strength. An example is safety parts in cars such as reinforcements for B-pillars, side skirts and bumpers.
We offer large and small quantities with very good formability used in the production of, for example:
- Crane arms
- Mining and construction machinery
- Bridge structures
- Agricultural machinery
High-strength structural steels
High-strength structural steels include structural steels that exceed a yield strength of 355MPa. Typical mechanical values of yield strength of high-strength structural steels are usually between 500 MPa -1300 MPa. In addition to the yield strength, these steels usually have
a requirement for impact strength not less than 27J at -40 ° C. The advantage of high-strength steel is that you can build a lighter construction and still maintain the desired strength compared to conventional structural steels. When designing in constructions in high-strength steel need but take into account a number of points.
1. Elastic deflection
2. Risk of buckling, increased risk when using smaller dimensions
3. The location of geometric irregularities and welds to reduce
the risk of fatigue failure
Extra high-strength structural steel as plate
After rolling, the plate goes to a continuous controlled tempering process where rapid cooling can control the phase transformation that takes place in the plate. The most common materials are classified according to microstructure. Two phase, complex phase, multiple phase, TRIP, Martensite and press hardened steel.
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