Hot rolled and unannealed ferritic stainless steel sheet having excellent impact toughness, and manufacturing method therefor
A stainless steel plate, impact toughness technology, applied to unannealed hot-rolled ferritic stainless steel plate and its manufacturing field, can solve the problems of deterioration of impact properties, increase brittleness, difficulty in obtaining fine grains, etc., and achieve high Charpy impact energy effect of value
Active Publication Date: 2021-04-30
浦项股份有限公司
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Problems solved by technology
[0005] In addition, during hot rolling, a thick material having a thickness of 6.0 mm or more has the problem of difficulty in obtaining fine grains due to lack of rolling reduction, and further increases due to the formation of coarse grains and uneven grains. Brittle, and the impact characteristics deteriorate
Method used
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Embodiment
[0094] After heating the slab of the composition shown in Table 1 below to 1,200°C, the reduction ratio in the final rolling mill of the rough rolling was set to 30%, and hot rolling was performed to a thickness of 10.0 mm so that in the finish rolling The temperature of the previously rough-rolled bar was about 1,000°C, and at the end of finish rolling was 910°C.
[0095] [Table 1]
[0096]
[0097] As shown in Table 2, hot-rolled steel sheets of N1 to N3 steels were coiled at 750° C., and γ index values of formula (1) and corresponding austenite phase (γ) fractions are shown.
[0098] [Table 2]
[0099] Ac1(°C) Coiling temperature (℃) Formula (1) (γ index) γ phase fraction N1 800 750 1,286 3％ N2 777 750 1,629 33％ N3 767 750 1,752 43％
[0100] 1. Microstructure
[0101] Observing the microstructure at the point of 1 / 4 thickness of the TD section of the N1 steel whose austenite phase (γ) fraction is controlled to 3% and the...
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Abstract
A hot rolled and unannealed ferritic stainless steel sheet having excellent impact characteristics, and having a thickness of 6 mm or more, and a manufacturing method therefor are disclosed. A hot rolled and unannealed ferritic stainless steel sheet having excellent impact toughness, according to one embodiment of the present invention, comprises, by wt%, C in an amount of greater than 0 and less than or equal to 0.03%, 0.1-0.5% of Si, 1.5% or less of Mn, 0.04% or less of P, 10.5-14% of Cr, Ni in an amount of greater than 0 and less than or equal to 1.5%, 0.01-0.5% of Ti, Cu in an amount of greater than 0 and less than or equal to 1.0%, N in an amount of greater than 0 and less than or equal to 0.015%, 0.1% or less of Al, and the balance of Fe and other inevitable impurities, and satisfies the following relation (1), and the average grain size of microstructure of the cross-section perpendicular to rolling plane is 60 [mu]m or less. (1) 1500 <= (1001.5*C + 950.6*Mn + 1350.5*Ni + 395.6*Cu - 0.7*Si - 1.0*Ti - 0.1*Cr - 1.0*P - 1.0*Al + 1020.5*N) <= 2200.
Description
technical field [0001] The present disclosure relates to a ferritic stainless steel hot-rolled thick material and a manufacturing method thereof, and more particularly, to a non-annealed hot-rolled ferritic stainless steel plate having a thickness of 6 mm or more and having excellent impact properties and a manufacturing method thereof . Background technique [0002] Ferritic stainless steel has poor workability, impact toughness, and high-temperature strength compared to austenitic stainless steel, but since it does not contain a large amount of Ni, it is cheap and has low thermal expansion. In recent years, ferritic stainless steel has been preferred for automotive exhaust system component materials. In particular, flanges for exhaust systems have recently been converted to ferritic stainless steel thick plates with improved corrosion resistance and durability due to microcracks and exhaust gas leakage problems. [0003] So far, carbon steel has been used for exhaust sys...
Claims
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IPC IPC(8): C22C38/42C22C38/50C22C38/00C22C38/06C22C38/04C22C38/02C21D8/02
CPCC22C38/42C22C38/04C22C38/02C22C38/06C22C38/50C22C38/001C21D8/0226C21D8/0205C21D2211/005
Inventor 孔正贤闵铉雄李文洙
Owner 浦项股份有限公司