High-strength electric resistance welded steel pipe excellent in long-term softening resistance in medium temperature region and manufacturing method thereof
A technology of electric resistance welded steel pipe and manufacturing method, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve problems such as insufficient reliability
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Embodiment 1
[0137]The raw steel material (slab: slab thickness 250 mm) with the composition shown in Table 1 was heated at the heating temperature shown in Table 2, that is, 1230° C. for 110 minutes, and then subjected to rough rolling and non-recrystallization temperature range (low (Temperature range of the recrystallization temperature) was adjusted to the conditions shown in Table 2 in the hot rolling ratio and finish rolling finish temperature to obtain a hot-rolled steel strip with a thickness of 19.1 mm. In addition, the molten steel of the composition shown in Table 1 was melt|melted in the converter, and the slab which obtained the slab thickness of 250 mm by the continuous casting method was used as the steel material.
[0138] Immediately after finish rolling, the hot-rolled steel strip was cooled on the hot-rolled run-out table under the conditions shown in Table 2, and coiled into a coil at the coiling temperature shown in Table 2. Then, the heat history of adjusting the resi...
Embodiment 2
[0170]Steel raw materials (slabs: slab thickness: 250 mm) having the compositions of Steel A to Steel E shown in Table 1 were heated and soaked under the heating conditions shown in Table 4-1, then rough rolled, and Table 1 was applied. Finish rolling under the conditions shown in 4-1, followed by cooling after rolling under the conditions shown in Table 4-1, and coiling into a coil at the coiling temperature shown in Table 4-1 to obtain hot rolled steel belt. The hot-rolled steel strip after coiling was subjected to a thermal history in which the residence time in the temperature range of 350 to 480° C. was adjusted to the time shown in Table 4-1 by adjusting the coiling temperature and coil cooling conditions.
[0171] The obtained hot-rolled steel strip is used as a steel pipe raw material, cut into a predetermined width, and continuously roll-formed to obtain an open pipe with a nearly circular cross-section, and then heated to a temperature above the melting point near th...
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Abstract
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