Page 10 - SSAB Welding Handbook Edition 2

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2.0 Introduction Welding handbook

2.1 The Hardox and Strenx grades HBW
©SSAB
Starting with the steel processing at SSAB, the 700
complete range of Hardox and Strenx grades
are designed for favorable weldability. The 600
selection of the chemical alloy content together 500
with the extremely low levels of contaminants for
each individual steel grade contributes to these 400
conditions. In addition, the steel processing at 300
SSAB is developed in a manner that supports 200
beneficial properties in the joints of these steel
grades. 100
0
Each Hardox and Strenx grade has a datasheet Wear resistant steel
stating its unique mechanical properties. These
documents list the maximum chemical content for Table 2.1: The stated hardness values for the Hardox grades. Hardox
HiTuf and Hardox 400-Hardox 600 have guaranteed hardness
each element in the steel. The alloy composition values while Hardox Extreme has typical values.
varies for different plate thicknesses within each
steel grade. The reason being that each plate
thickness behaves differently during the production The fundamental mechanical property of wear
process and the alloy composition for a given resistant steel is a high hardness value in the
plate thickness is adjusted in order to optimize its unaffected parent metal. Other mechanical
properties. The typical outcome is that the level of properties for this kind of steel are important but
alloys and contaminants in each plate thickness, normally not as crucial as the hardness value.
for all Hardox and Strenx grades, is lower than the Therefore, Hardox grades are developed with a
stated maximum values. guaranteed hardness range, with the exception of
Hardox Extreme which is stated with typical
A common factor shared by all Strenx and values. Typical yield strength and impact toughness
Hardox steels is that they can be welded to all as well as minimum impact toughness are stated
other weldable steels using any conventional for certain Hardox grades.
welding process. All Hardox grades are weldable. The welding
technology of the Hardox grades share commonalities
with the Strenx grades. However, the requirements
The Hardox grades for the mechanical properties in joints of Hardox are

Hardox grades are wear resistant steels with high normally less extensive than those of Strenx.
hardness as well as high strength. The complete
range of Hardox grades with corresponding Minimizing the risk of hydrogen cracks in joints is
hardness values are illustrated in table 2.1. important for both Hardox and Strenx. In general,
as the hardness and strength of the steel increases,
so does the susceptibility to hydrogen cracks.
Accordingly, the most stringent demands are placed
on the Hardox grades with the highest hardness

10 This handbook contains general suggestions and information without any expressed or implied warranty of any kind. SSAB hereby expressly disclaims
all liability of any kind, including any damages, in connection with the use of the information and for their suitability for individual applications.
It is the responsibility of the user of this brochure to adapt the recommendations contained therein to the requirements of individual applications.