Strip, sheet HN35WT
Flat mill-products of HN35WT grade are made of high-alloyed low-carbon constructional steel. It should be carburized (case-hardened) in some cases with a purpose of increasing hardness and wearing quality. Titanium (1,1−1,5%), cuprum (<0.25%), phosphorus (<0.03%), mangan (<1-2%), wolframium (2,3-3,5%), molybdenum ( 0,3%), sulfur (0,02%) shoud be added to charge mixture in the capacity of masteralloys.
At the beginning jumping-up temperature of semi-fabricates is 1170 °C; in the end a temperature is 850 °C. Finished mill-products are cooled in air.
This alloy relates to hardly weldable steels. It is necessary to do a previous heating to 200−300°С with an annealing (finishing heat treatment) to increase reliability of seams. Fastening of construction units is performed with a help of hand arc-welding method and electrodes KTI-762. Final annealing is recommended for releasing of stresses.
|limitedly weldable||welding is possible at heating to 100−120°С and last heat treating|
|hardly weldable||in order to obtain a qualitative welded joints, it is necessary to perform the following operations: while welding to heat it up to 200−300°C, to do a heat treating (annealing) after welding|
|welding is done without further heat treating or previous heating|
It is used in details of high-temperature equipment that are exploited in mechanical engineering and petrochemical industry; in manufacture of disks, flat springs, screens that can work at temperature of <650 °C. If a temperature is higher than 850°C, there appears an active oxide scale formation.
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