Page 65 - SSAB Welding Handbook Edition 2

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Welding handbook 11.0 Cutting of Weldox and Hardox

It is also important that the post heat treatment
starts as soon as possible after finished cutting
©SSAB
operation. Apply maximum 60 minutes between the
start of the cutting operation and the start of the
postheating operation.

The heat from the torch will temper the re-quenched
zone of the HAZ which will reduce the tensile
stresses at the cut edge.

The torch used should have a rather big flame with
low intensity. Preferably a heating nozzle can be
used. Such nozzle allows the heat to reach further in
to the material without overheating the material. A
normal cutting torch has normally a too small and
hot flame.

Fig. 11.9: Temperature measurement during postheating.

Cutting speed (mm/min)

Max plate Hardox Hardox Hardox 400 Hardox 450 Hardox Hardox 500 Hardox 550 Hardox 600 Hardox
thickness HiTemp HiTuf Strenx 1100 500Tuf Extreme
(mm)

12 no restrictions no restrictions no restrictions no restrictions no restrictions no restrictions no restrictions no restrictions
15 no restrictions no restrictions no restrictions no restrictions no restrictions no restrictions no restrictions Max 300
20 no restrictions no restrictions no restrictions no restrictions no restrictions no restrictions no restrictions Max 200
25 no restrictions no restrictions no restrictions no restrictions no restrictions Max 300 Max 270 Max 180
30 no restrictions no restrictions no restrictions no restrictions Max 250 Max 230 Max 150
35 no restrictions no restrictions no restrictions no restrictions Max 230 Max 190 Max 140
40 no restrictions no restrictions no restrictions Max 230 Max 200 Max 160 Max 130
45 no restrictions Max 230 Max 230 Max 200 Max 170 Max 140 Max 120
50 no restrictions Max 210 Max 210 Max 180 Max 150 Max 130 Max 110
60 Max 200 Max 200 Max 170 Max 140 - -
70 Max 190 Max 190 Max 160 Max 135 - -
80 180 180 150 130 - -
>80 * * - - - -

Table 11.6: Maximum cutting speeds for oxy-fuel cutting without preheating.
*Only preheating is applicable.
**SSAB recommends AWJ cutting.

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. 65
It is the responsibility of the user of this brochure to adapt the recommendations contained therein to the requirements of individual applications.