Aluminum alloy material for high-pressure hydrogen gas container and method for producing the same
AssigneesKabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.), Uacj Corporation, Nippon Light Metal Company, Ltd.
InventorsManabu NAKAI, Shigenobu YASUNAGA
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Abstract
An aluminum alloy material for a high-pressure hydrogen gas container contains 0.6 to 1.5 mass % of Si, 0.6 to 1.6 mass % of Mg, 0.1 to 1.0 mass % of Cu, 0.05 to 0.4 mass % of Fe, 0.9 mass % or less of Mn, 0.3 mass % or less of Cr, 0.15 mass % or less of Zr, 0.2 mass % or less of V, 0.25 mass % or less of Zn, and 0.1 mass % or less of Ti, with the balance being Al and inevitable impurities. The total content of Mn, Cr, Zr, and V is 0.05 mass % or more. The material has a yield strength S (MPa) of 270 MPa or more and an electrical conductivity E (IACS %) of 36 IACS % or more and satisfies formulae (1) and (2): (1) S≦−10.46×E+801, (2) S≧−25×E+1296.
Claims2
An aluminum alloy material for a high-pressure hydrogen gas container, the aluminum alloy material comprising:
- 0.6 to 1.5 mass % of Si;
- 0.6 to 1.6 mass % of Mg;
- 0.1 to 1.0 mass % of Cu;
- 0.05 to 0.4 mass % of Fe;
- 0.9 mass % or less of Mn;
- 0.3 mass % or less of Cr;
- 0.15 mass % or less of Zr;
- 0.2 mass % or less of V;
- 0.25 mass % or less of Zn;
- and
- 0.1 mass % or less of Ti;
- and
- Al,
- wherein
- a total content of Mn, Cr, Zr, and V is 0.05 mass % or more,
- the aluminum alloy material has a yield strength S of 270 MPa or more and an electrical conductivity E of 36 IACS % or more and satisfies formulae (1) and (2):
- S≦−10.46×E+801, formula (1):
- S≧−25×E+1296 formula (2).
A method for producing an aluminum alloy material for a high-pressure hydrogen gas container, the method comprising in order:
- executing a melting-casting comprising casting an aluminum alloy to form an ingot, wherein
- the aluminum alloy comprises:
- 0.6 to 1.5 mass % of Si,
- 0.6 to 1.6 mass % of Mg,
- 0.1 to 1.0 mass % of Cu,
- 0.05 to 0.4 mass % of Fe,
- 0.9 mass % or less of Mn,
- 0.3 mass % or less of Cr,
- 0.15 mass % or less of Zr,
- 0.2 mass % or less of V,
- 0.25 mass % or less of Zn,
- 0.1 mass % or less of Ti, and
- Al, and
- a total content of Mn, Cr, Zr, and V is 0.05 mass % or more;
- executing a homogenizing heat treatment comprising heat-treating the ingot at 475 to 575° C.;
- executing a hot working comprising performing hot working at 275 to 575° C. at a working ratio of 50% or more;
- executing a tempering treatment comprising performing a solution treatment and performing a quenching treatment at a cooling rate of 1° C./second or more;
- and
- executing a thermal aging treatment comprising performing a heat treatment at 160 to 240° C. for 1 to 48 hours.
Dependencies are inferred from the claim text.