Alloy for a fusible plug and a fusible plug

Patent metadata

Field	Value
Publication number	US-10036479-B2
Application number	US-91825505-A
Country	US
Kind code	B2
Filing date	Apr 14, 2005
Priority date	Apr 14, 2005
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

A fusible plug employs an alloy which comprises 5-8 mass % of Sn, 31-34 mass % of Bi, 0.2-4 mass % of Sb, and a remainder of In. The alloy melts at approximately 66-70° C. The alloy may further contain at most 2.0 mass % of at least one element selected from strengthening elements consisting of 0.1-1.0 mass % of Cu, 0.1-1.0 mass % of Ge, 0.1-0.7 mass % of Ag, 0.1-0.6 mass % of Au, 0.2-0.6 mass % of Zn, 0.002-0.1 mass % of Ni, and 0.01-0.1 mass % of a lanthanoid.

First claim

The invention claimed is:

1. A fusible plug comprising
a hollow blank having a bore and an alloy for a fusible plug sealing the bore, the alloy having an operating temperature, solidus temperature, and peak temperature in the range of 66-70° C. and consisting essentially of
6-8 mass percent of Sn,
31-33 mass percent of Bi,
0.5-2 mass percent of Sb,
Further optionally, a total of at most 4.0 mass percent of at least one alloying element selected from

strengthening elements consisting essentially of
0.1-1.0 mass percent of Cu,
0.1-1.0 mass percent of Ge,
0.1-0.7 mass percent of Ag,
0.02-0.1 mass percent of Ni,
and 0.01-0.1 mass percent of a lanthanoid;
and a remainder of In
as alloying elements.

2. A fusible plug comprising a hollow blank having a bore and an alloy for a fusible plug sealing the bore, the alloy having an operating temperature, solidus temperature, and peak temperature in the range of 66-70° C. and consisting essentially of
6-8 mass percent of Sn,
31-33 mass percent of Bi,
0.2-4 mass percent of Sb,
further optionally at least one of
0.1-1.0 mass percent of Cu,
0.1-1.0 mass percent of Ge,
0.1-0.7 mass percent of Ag,
0.1-0.6 mass percent of Au,
0.02-0.1 mass percent of Ni,
and 0.01-0.1 mass percent of a lanthanoid;

and a remainder of In
as alloying elements.

3. The fusible plug as claimed in claim 1 wherein the alloy contains 33 mass percent of Bi and 1 mass percent of Sb as alloying elements.

4. The fusible plug as claimed in claim 2 wherein the alloy contains 33 mass percent of Bi and 1 mass percent of Sb as alloying elements.

5. The fusible plug as claimed in claim 1 wherein the blank has a thread on its outer surface.

6. The fusible plug as claimed in claim 1 wherein the alloy contains 1-2 mass percent of Sb as an alloying element.

7. The fusible plug as claimed in claim 1 wherein the alloy contains 6-7 mass percent of Sn as an alloying element.

8. The fusible plug as claimed in claim 2 wherein the blank has a thread on its outer surface.

9. The fusible plug as claimed in claim 2 wherein the alloy contains 1-2 mass percent of Sb as an alloying element.

10. The fusible plug as claimed in claim 2 wherein the alloy contains 6-7 mass percent of Sn as an alloying element.

11. A fusible plug comprising
a hollow blank having a bore and an alloy for a fusible plug sealing the bore, the alloy having an operating temperature, solidus temperature, and peak temperature in the range of 66-70° C. and consisting essentially of
6-8 mass percent of Sn,
31-33 mass percent of Bi,
0.2-4 mass percent of Sb,
and a remainder of In
as alloying elements.

12. The fusible plug as claimed in claim 11 , wherein the blank has a thread on its outer surface.

13. A fusible plug comprising a hollow blank having a bore and an alloy for a fusible plug sealing the bore, the alloy having an operating temperature, solidus temperature, and peak temperature in the range of 66-70° C. and consisting essentially of
6-8 mass percent of Sn,
31-33 mass percent of Bi,
0.2-4 mass percent of Sb,
further optionally at least one of
0.1-1.0 mass percent of Cu,
0.1-1.0 mass percent of Ge,
0.1-0.7 mass percent of Ag,
0.1-0.6 mass percent of Au,
0.02-0.1 mass percent of Ni, and
0.01-0.1 mass percent of a lanthanoid,

and a remainder of In
as alloying elements,

wherein no more than about 1.5 mm of the alloy is extruded from the blank after 24 hours under 12.5 MPa of pressure at 65° C.

14. A fusible plug comprising a hollow blank having a bore and an alloy for a fusible plug sealing the bore, the alloy having an operating temperature, solidus temperature, and peak temperature in the range of 66-70° C. and consisting essentially of
6-8 mass percent of Sn,
31-33 mass percent of Bi,
0.5-2 mass percent of Sb,
further optionally, a total of at most 4.0 mass percent of at least one alloying element selected from strengthening element
0.1-1.0 mass percent of Cu,
0.1-1.0 mass percent of Ge,
0.1-0.7 mass percent of Ag,
0.1-0.6 mass percent of Au,
0.02-0.1 mass percent of Ni, and
0.01-0.1 mass percent of a lanthanoid,

and a remainder of In
as alloying elements,

wherein no more than about 1.5 mm of the alloy is extruded from the blank after 24 hours under 12.5 MPa of pressure at 65° C.

Assignees

• Kato Rikiya
• Kikuchi Tetsuro
• Deguchi Mutsumi
• Koiwa Yasuaki
• Senju Metal Industry Co

Inventors

• Kato Rikiya
• Kikuchi Tetsuro
• Deguchi Mutsumi
• Koiwa Yasuaki

Classifications

• F25B2400/162

  characterised by the plug or stop · CPC title

• F16K17/383 Primary

  the valve comprising fusible, softening or meltable elements, e.g. used as link, blocking element, seal, closure plug (F16K17/386 takes precedence) · CPC title

• C22C28/00

  Alloys based on a metal not provided for in groups C22C5/00 - C22C27/00 · CPC title

• F28F2265/12

  for preventing overpressure · CPC title