Low melting point alloys refer to fusible alloys with melting points below 232°C (the melting point of Sn), typically composed of low melting point metallic elements such as Bi, Sn, Pb, Cd, etc. These alloys are widely used as soldering materials and as thermal-sensitive components like fuses and fusible links in electrical, steam, firefighting, and fire alarm systems. They represent a class of novel low melting point alloy materials with significant development potential.

Low melting point tin-bismuth mold alloys are used to manufacture cold stamping dies for thin sheets, capable of pressing copper, aluminum, steel, stainless steel, and other sheet materials, with steel sheet thicknesses up to a certain limit. They are applied in the stretching, bending, and forming of thin sheets. Using low melting point alloy molds eliminates the need for mold steel, simplifies and speeds up mold formation; reduces mold costs and allows for quick updates; requires no adjustment or machining of molds; and enables remelting and reuse of alloys after mold use. Due to rapid mold formation, it significantly reduces the storage space required for molds.

Low melting point tin-bismuth alloy molds utilize non-ferrous metal alloys with relatively low melting points as casting materials. Based on a sample piece, the mold is cast and formed within a melting box, serving as a stamping die. In the late 20th century, low melting point tin-bismuth alloy molds found applications, particularly in the deep drawing forming dies for automotive body panels, highlighting their advantages.

Characteristics of low melting point tin-bismuth alloys: Stamping molds feature the simultaneous formation of punch and die through casting, ensuring uniform clearance between them after casting without the need for adjustment; molds can be cast directly on press machines and used immediately after casting; the casting alloy material can be repeatedly remelted and recast or repurposed for other molds. It is anticipated that with economic development, tin-bismuth alloys will enjoy broader application prospects.