An economical x70 pipeline steel plate used in extra-thick specification ultra-low temperature environment and its manufacturing method
An ultra-low temperature and economical technology, applied in the field of metallurgy, can solve the problems of undefined steel plate thickness, inability to adapt to use, lack of -60°C impact and -30°C drop hammer performance description, etc., to make up for the loss of strength and toughness, strengthen fine Crystal grain effect, strong economical effect
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[0029]According to the scope of chemical composition and manufacturing method of the present invention, pretreatment of molten iron by KR—converter top and bottom blowing—LF refining—RH vacuum degassing—continuous casting—continuous casting slab covered and slow cooling—continuous casting slab inspection and cleaning—casting slab Heating—high pressure water descaling—rolling—straightening—slow cooling of the steel plate stack—quenching—tempering, etc., manufacturing thickness 33mm (Example 1) and 40.5mm (Example 2) under the low temperature condition of -60°C The X70 pipeline steel plate used.
[0030] The specific process of the above heating, rolling and slow cooling stages is as follows: heat the continuous casting slab with a thickness of about 450mm to 1080°C, keep it warm for 180min (Example 1 and 2), and use high-pressure water to descale the continuous casting slab after it comes out of the furnace; Stage rolling, the first stage rolling temperature is 1050°C (Example ...
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