___________________________________________________________________________
______________________________________________________________________________
15
BOR-ON 2008-10-07
4.2 BOR-ON Material Types
10 - 18 Test Points
HSLA-Steel (
High strength low alloy steel
):
Is a low alloy high strength steel and obtains its increased strength through the
alloying elements vanadium, niobium, or titanium etc.
Welding and straightening
There can be some limitations in terms of heat distribution during welding and hot-
straightening. Cold-straightening can however be carried out without affecting the
material, but it is limited because of the high elastic limit and hardness. The harder
materials require special titanium bits for drilling etc.
:
ALWAYS FOLLOW THE MANUFACTURERS RECOMMENDED REPAIR
METHOD!
18 - 35 Test Points
EHS steel (
Extra high strength steel
):
Extra High Strength Steels obtain their increased strength by heat-treatment
(hardening) during manufacturing phase, some of them also retained austenite,
which is converted to martensite (!) during deformation.
Welding and straightening
EHS Steels are very sensitive to heat, even at low temperatures and for short
periods, so restrictions on heating and welding apply. Straightening is limited
because of the high elastic limit and hardness. They require special tools, ex.
titanium bits for drilling, cutting etc.
:
ALWAYS FOLLOW THE MANUFACTURERS RECOMMENDED REPAIR
METHOD!
over 35 Test Points
UHS steel (
Ultra high strength steel
):
This material obtains its extremely high strength due to the addition of the element
Bor in combination with hardening/heat treatment of the component during
manufacturing phase.
Welding and straightening
Straightening is impossible because of the high elastic limit and hardness. Cracking
is encountered in attempts to straightening, which weakens the material. Application
of heat reduces cracking but instead softens the material. The harder materials
require special tools, ex. titanium bits for drilling, cutting etc.
:
ALWAYS FOLLOW THE MANUFACTURERS RECOMMENDED REPAIR
METHOD!
