Low-crack sensitive pipe fitting steel plate used under low temperature condition and manufacturing method thereof
A technology of low temperature conditions and manufacturing methods, applied in the metallurgical field, can solve problems such as poor weldability, and achieve the effects of low cold crack sensitivity coefficient, good low temperature toughness, and refinement of austenite grain size
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[0031] According to the scope of chemical composition and manufacturing method of the present invention, pretreatment of molten iron by KR—converter smelting—LF refining—RH vacuum degassing—continuous casting of 370-450mm thick continuous casting slab—continuous casting slab with cover and slow cooling—continuous casting slab inspection Cleaning—slab heating—high pressure water descaling—rolling—ACC cooling—air cooling—straightening—offline tempering process steps to manufacture steel plates for low crack sensitivity pipe fittings used under low temperature conditions of -60°C.
[0032] The specific process of the above-mentioned heating, rolling and slow cooling stages is: the 450mm thick continuous casting slab is heated to 1200°C and kept for 200 minutes (Example 1 and 2), and the continuous casting slab is descaled with high-pressure water after it is released from the furnace; then two-stage rolling is carried out , the first stage is rough rolling, the starting rolling temp...
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