Abstract: A toy vehicle transformable between first and second forms includes an undercarriage, a top member having first and second surfaces serving as upper surfaces of the vehicle in the first and second forms, respectively, a front member rotatably connected to the front end portion of the top member, where the front member has first and second surfaces serving as front surfaces of the vehicle in the first and second forms, respectively, and a connector that connects the rear end portion of the top member to the undercarriage and that includes a separation rotation shaft for supporting the top member for rotation in a direction in which the top member moves away from the undercarriage and a turnover rotation shaft for supporting the top member for rotation in a direction in which the top member is turned over.

Abstract: Cr-Ni system austenitic heat-resisting steel exhibiting higher heat resistance than that of well-known austenitic stainless steels by means of which an atomic ratio of C being 0.05 to 0.30% to Ti being 0.01 to 0.8% and/or Nb (Ta) being 0.01 to 1.6% is within the range of 1.3 to 7, preferably 3 to 6 and the grain size is within the range of ASTM No. 3 to 8.

Abstract: Creep rupture strength of austenitic heat resisting steel containing chromium and nickel is improved by adding to the steel small amounts of niobium, a niobium-tantalum or a niobium-tantalum-titanium mixture, and maintaining a Nb/C ratio of less than 3.5.

Abstract: An austenitic heat resisting steel exhibiting excellent strength for a long period of time services at an elevated temperature, coexistant-adding 0.02 to 1.0% Nb and 0.02 to 1.9% Zr or 0.02 to 1.0% Nb, 0.02 to 1.0% Zr and 0.02 to 1.0% Ti in addition to usual composition of a stainless steel, simultaneously adjusting the atomic ratio of said(Nb+Zr) or (Nb+Zr+Ti) to C within the range of 0.05 to 1.0, preferably 0.2 to 0.5.