Ultra-high-strength hot-rolled steel sheet, steel pipe, member, and manufacturing methods therefor
A hot-rolled steel plate, ultra-high-strength technology, applied in the direction of manufacturing tools, heat treatment furnaces, heat treatment equipment, etc., can solve the problems that have not been raised, and achieve the effect of inhibiting permeation and excellent hydrogen permeation resistance
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[0183] Hereinafter, the present invention will be described in more detail through examples.
[0184] (Example)
[0185]Using the steels with the compositions in Table 1 and Table 2 below, hot rolling was carried out under the conditions in Table 3 below to produce hot-rolled steel sheets with a thickness of 3 mm, which were then pickled. Before hot rolling, the manufactured slabs are heated for 200 minutes at a temperature range of 1200±20°C for homogenization, and then each slab is subjected to rough rolling and finish rolling at a temperature of 600-700°C Coiled to obtain a hot-rolled steel plate with a thickness of 3 mm.
[0186] In Table 1 and Table 2 below, Invention Steels (1 to 5) satisfy Relational Expression (1) and Relational Expression (2), and the sum of Cu+Ni is 1.1 or more. Comparative steel (1) does not satisfy relational expression (1) and relational expression (2), and the sum of Cu+Ni is less than 1.1, and the sum of Cu+Ni of comparative steel (2) is less ...
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