Economical anti-HIC pipeline steel plate X52NS delivered in normalized state and manufacturing method for same
A manufacturing method and economical technology, applied in the field of metallurgy, can solve the problems of unstable HIC performance and high manufacturing cost of HIC-resistant pipeline steel, and achieve uniform ferrite pearlite structure, excellent HIC-resistant performance, and reduce segregation.
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[0023] Example 1-2:
[0024] According to the chemical composition range and manufacturing method of the present invention, after KR hot metal pretreatment-converter smelting-LF refining-RH vacuum degassing-continuous casting-continuous casting slab and slow cooling-continuous casting slab inspection and cleaning-casting slab heating-high pressure Water descaling-controlled rolling-straightening-normalizing and other process steps to manufacture X52NS economical HIC resistant pipeline steel with a thickness of 30mm (Examples 1 and 2). The continuous casting billet satisfies P≤0.008; S≤0.0008; [N]≤0.002, [O]≤0.0010, [H]≤0.0001, and the sum of the four types of inclusions A, B, C, and D is less than or equal to level 2. The continuous casting billet is slowly cooled with a cover for 120 hours.
[0025] The specific process of the above heating, rolling and slow cooling stage is: heating the 370mm thick continuous casting slab to 1200-1280°C, keeping the temperature for 150-180min, a...
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