HOT-STAMPED HIGH STRENGTH STEEL WITH SUPERIOR ANTICORROSION PROPERTY AFTER PAINTING, AND METHOD OF ITS MANUFACTURING

摘要

FIELD: metallurgy.SUBSTANCE: invention refers to metallurgy, particularly to production of hot-stamped high strength part. The hot-stamped high strength part has clad layer out of aluminium alloy based on Al-Fe, containing phase of intermetallic compound Al-Fe on surface of the steel plate. Average linear length of the cut sections of the crystalline grains of the phase containing Al 40-65 wt % among the said phases is 3-20 mcm. Average thickness of the clad layer out of alloy Al-Fe is 10-50 mcm. Ratio of average thickness to standard thickness deviation of the clad layer out alloy Al-Fe complies with the following relationship: 0< standard thickness deviation / average thickness ?0.15.EFFECT: suppression of cracks propagation in clad layer during hot volume stamping, and increased anticorrosion properties after painting.12 cl, 6 dwg, 5 tbl, 4 ex