Steel Sheet Coated with a Metallic Coating based on Aluminum
A steel sheet coated with a metallic coating is provided. The steel sheet includes from 2.0 to 24.0% by weight of zinc, from 7.1 to 12.0% by weight of silicon, optionally from 1.1 to 8.0% by weight of magnesium, and optionally additional elements chosen from Pb, Ni, Zr, or Hf, the content by weight of each additional element being less than 0.3% by weight, the balance being aluminum and optionally unavoidable impurities and residual elements. The ratio Al/Zn is above 2.9.
1 - 25 . (canceled)
26 . A steel sheet coated with a metallic coating, the metallic coating comprising:
2.0 to 24.0% by weight of zinc;
7.1 to 12.0% by weight of silicon; and
a balance being aluminum, unavoidable impurities and residual elements; and
a ratio of Al/Zn being greater than 2.9
27 . The steel sheet according to claim 26 , further comprising from 1.1 to 8.0% by weight of magnesium
28 . The steel sheet according to claim 26 , further comprising additional elements chosen from Pb, Ni, Zr, or Hf, the content by weight of each additional element being less than 0.3% by weight.
29 . The steel sheet according to claim 26 , wherein the ratio Al/Zn is less than or equal to 8.5.
30 . The steel sheet according to claim 29 , wherein the ratio Al/Zn is between 3.0 and 7.5.
31 . The steel sheet according to claim 30 , wherein the ratio Al/Zn is between 4.0 and 6.0.
32 . The steel sheet according to claim 26 , wherein a microstructure of the metallic coating comprises an Al—Zn phase.
33 . The steel sheet according to claim 26 , wherein the coating comprises from 10.0 to 20.0% by weight of zinc.
34 . The steel sheet according to claim 26 , wherein the coating comprises from 10.0 to 15.0% by weight of zinc.
35 . The steel sheet according to claim 26 , wherein the coating comprises from 8.1 to 10.0% by weight of silicon.
36 . The steel sheet according to claim 26 , wherein the coating comprises from 3.0 to 8.0% by weight of magnesium.
37 . The steel sheet according to claim 36 , wherein the coating comprises from 3.0 to 5.0% by weight of magnesium.
38 . The steel sheet according to claims 26 , wherein a microstructure of the metallic coating comprises a Mg 2 Si phase.
39 . The steel sheet according to claim 26 , wherein a microstructure of the metallic coating comprises a MgZn 2 phase.
40 . The steel sheet according to claim 26 , wherein an amount of aluminum is greater than 71% by weight.
41 . The steel sheet according claim 26 , wherein an amount of aluminum is greater than 76% by weight.
42 . The steel sheet according to claim 26 , wherein a thickness of the metallic coating is between 5 and 50 μm.
43 . The steel sheet according to claim 42 , wherein the thickness is between 10 and 35 μm.
44 . The steel sheet according to claim 42 , wherein the thickness is between 12 and 18 μm.
45 . The steel sheet according to claim 42 , wherein the thickness is between 26 and 31 μm.
46 . The steel sheet according to claim 26 , wherein the coating does not comprise elements selected among Cr, Mn, Ti, Ce, La, Nd, Pr, Ca, Bi, In, Sn and Sb or combinations thereof.
47 . A part comprising:
the coated steel sheet according to claim 26 formed into a part by hot-forming or cold-stamping.
48 . The part according to claim 47 , wherein the part is formed by hot-forming and cold-stamping.
49 . The part according to claim 47 , wherein the part is a press hardened steel part having a variable thickness.
50 . The part according to claim 49 , wherein the variable thickness is produced by a continuous flexible rolling process.
51 . The part according to claim 47 , wherein the part is a tailored rolled blank.
52 . The part according to claim 47 , wherein the part is a front rail, a seat cross member, a side sill member, a dash panel cross member, a front floor reinforcement, a rear floor cross member, a rear rail, a B-pillar, a door ring or a shotgun.
53 . An automotive vehicle comprising:
the part according to claim 47 .