Medium chromium ferrite stainless steel and making method thereof
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A stainless steel, element body technology, applied in the direction of temperature control, rolling force/roll gap control, etc., can solve the problems of low strength and hardness, poor formability, etc., and achieve the effect of good strong plasticity
Inactive Publication Date: 2011-05-04
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
However, ordinary medium-chromium ferritic stainless steel (typical steel grade 430) not only has poor formability, but also has low strength and hardness.
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Embodiment 1
[0040] Ti: 0.12 is added to the chemical composition.
[0041] The method is as follows: the heating temperature of steel slab or continuous casting slab is 1250°C; hot rolling, the final rolling temperature is 900°C, and the coiling temperature is 750°C; hot rolling annealing: 900°C×6min.
Embodiment 1-1
[0043] Chemical composition is with embodiment 1.
[0044] The method is the same as in Example 1, and additional steps are included: cold rolling: two rolling passes, cold rolling reduction rate 45%+60%; intermediate annealing: 950°C×6min; final annealing: 950°C×6min.
Embodiment 1-2
[0046] Chemical composition is with embodiment 1.
[0047]The method is as follows: billet or continuous casting billet heating temperature is 1000°C; hot rolling, final rolling temperature is 800°C, coiling temperature is 750°C; hot rolling annealing: 900°C×6min; cold rolling: two rolling passes, cold rolling The lower rate is 45%+60%; intermediate annealing: 950℃×6min; final annealing: 750℃×10min.
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Abstract
The invention provides medium chromium ferrite stainless steel which comprises the following chemical compositions in percentage by weight: 0.02-0.08 percent of C, not more than 1.0 percent of Si, not more than 1.0 percent of Mn, not more than 0.05 percent of P, not more than 0.01 percent of S, 16-20 percent of Cr, 0.05-0.50 percent of V, 0.005-0.05 percent of N, not more than 0.10 percent of Al, not more than 0.5 percent of Ni, not more than 0.010 percent of O, not more than 0.005 percent of Ca, additional not more than 0.30 percent of Ti and / or not more than 0.30 percent of Nb, and the balance of iron or other inevitable impurities. The invention also provides a making method of the medium chromium ferrite stainless steel, comprising the following steps of, firstly, heating a billet or a cast blank with the heating temperature of 1000-1250 DEG C; secondly, carrying out hot rolling; thirdly, annealing and pickling; fourthly, carrying out cold rolling; and fifthly, annealing and pickling. By adopting the composition design and the making method, a steel plate with good strength and plasticity, corrosion resistance and transverse performance is produced, thereby the machining needs of household appliances and products are met.
Description
technical field [0001] The invention relates to a ferritic stainless steel and a manufacturing method thereof, in particular to a medium chromium ferritic stainless steel with good strong plasticity and corrosion resistance and a manufacturing method thereof. Background technique [0002] Medium chromium ferritic stainless steel does not contain nickel or only a small amount of nickel is added, so it has the advantage of lower cost than austenitic stainless steel, and it has excellent corrosion resistance such as chloride ion corrosion resistance and pitting corrosion resistance, and its thermal expansion coefficient is small. It is increasingly used to replace 304 stainless steel and is used in the manufacture of durable decorations, home appliance parts and kitchen equipment. However, ordinary medium-chromium ferritic stainless steel (typical steel grade is 430) not only has poor formability, but also has low strength and hardness. [0003] Table 1 lists some patents on f...
Claims
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