車両用低炭素ステンレス鋼の機械的性質と溶接性

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  • Mechanical Properties and Weldability of High Strength Stainless Steel Bearing 0.03% or Less Carbon for Railroad Vehicles
  • シャリョウヨウ テイ タンソ ステンレス コウ ノ キカイテキ セイシツ ト

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The effects of alloying elements, volume fraction of deformation-induced martensite and rolling reduction on the mechanical properties of Type 301 stainless steels bearing 0.03% or less carbon have been investigated, and product properties of this Type 301L are also shown.<BR>1) Tensile strength strongly depended on the volume fraction of deformation-induced martensite and tensile strength decreased with increasing Nieq., where Nieq.=Ni(%) +0.35Si(%) +0.5Mn(%) +0.65Cr (%) +12.6(C+N)(%). Steels having a constant Nieq. showed higher tensile strength by increasing N.<BR>2) Proof stress of as-annealed and 20%-rolled materials was little affected by Nieq. and increased with increasing N content.<BR>3) Elongation was little affected by N content, and it strongly depended on Nieq. As N is one of the factors in Nieq., N has an influence on elongation through Nieq.<BR>4) The mechanical properties of all the products, from LT to HT tempered ones, were confirmed to meet the typical specification for the railroad vehicles.<BR>5) Mechanical properties of Type 301L welded joints were equal to those of Type 301M bearing 0.06% carbon.<BR>6) In the case that metastable austenite stainless steels were cold-rolled, welding current required to form the nugget where diameter was 4 mm decreased, because specific resistance increased with increment of deformation-induced martensite by cold-rolling.<BR>7) Resistance of Type 301L to intergranular stress corrosion cracking and intergranular corrosion was superior to that of Type 301M.

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  • 鉄と鋼

    鉄と鋼 69 (11), 1456-1462, 1983

    一般社団法人 日本鉄鋼協会

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