| 简介 |
FIELD : metallurgy.
SUBSTANCE : invention relates to metallurgy, particularly, to ferrite stainless steel sheet, used for production of parts, subjected to high temperatures, in particular elements of exhaust systems of internal combustion engines. Said steel contains following substances, in wt% : trace amounts of ≤ C ≤ 0.03, 0.2 ≤ Mn ≤ 1, 0.2 ≤ Si ≤ 1, trace amounts of ≤ S ≤ 0.01, trace amounts of ≤ P ≤ 0.04, 15 ≤ Cr ≤ 22, trace amounts of ≤ Ni ≤ 0.5, trace amounts of ≤ Mo ≤2, trace amounts of ≤ Cu ≤ 0.5, 0.160 ≤ Ti ≤ 1, 0.02 ≤ Al ≤ 1, 0.2 ≤ Nb ≤ 1, trace amounts of ≤ V ≤ 0.2, 0.009 ≤ N ≤ 0.03, trace amounts of ≤ Co ≤ 0.2, trace amounts of ≤ Sn ≤ 0.05, rare-earth elements (REE) ≤ 0.1, trace amounts of ≤ Zr ≤ 0.01, iron and unavoidable impurities making the rest. Content of Al and rare-earth elements (REE) satisfy the relationship Al+30×REE≥0.15%, and content of Nb, C, N and Ti in % satisfy the relationship 1/[Nb+(7/4)×Ti-7×(C+ Ν)]≤3. Sheet has a completely recrystallized structure and average size of ferrite grain of between 25 and 65 mcm.
EFFECT : higher resistance to corrosion under the action of water, urea and ammonia.
7 cl, 3 dwg, 3 tbl |
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