| 摘要 |
FIELD: transportation. ^ SUBSTANCE: top of automotive body roof contains at least steel frame and envelope component made of aluminium alloy, affixed to steel frame before covering and drying heat treatment of paint-and-lacquer coating. Envelope component made of aluminium alloy is implemented of treated for solid solution, hardening and aging during 3 weeks at temperature of sheet environment with content, wt %: Si 0.7-1,3, Fe<0.5, Cu 0.5-1.1, Mn 0.4-1.0, Mg 0.6-1.2, Zn<0.7, Cr<0.25, Zr+Ti<0.20, aluminium and unavoidable admixtures - the rest. After previously mentioned heat processing sheet apparent elastic limit made of aluminium alloy is R0.2 less than 170 MPa, and preferentially - less than 160 MPa. There are developed sheets which are of meant for reuse compound, sufficient deformability and low striation at deep stamping in heavy-load conditions, raised endurance to dent formation, capability of form elastic recovery after deformation, good aptitude for bonding, scarfing without burring, good endurance to filiform corrosion, and improved permanent deformation characteristics after drying. ^ EFFECT: characteristics improvement. ^ 16 cl, 7 tbl, 2 dwg, 5 ex |
