ASTM TM8 Thermal Bimetal Strip 1.0x120mm for Thermal Switches with 14.5 Specific Bending and -70°C to 200°C Operating Range

Thermal bimetal strip is a composite material consisting of two or more layers of metal or alloy with different expansion coefficients, solidly bonded together. This construction enables shape changes in response to temperature variations along the entire interface. The high expansion coefficient layer serves as the active layer, while the low expansion coefficient layer functions as the passive layer. When high resistivity is required while maintaining similar thermal sensitivity, an intermediate layer of varying thickness can be added between the two primary layers to serve as a shunt layer, achieving the desired resistivity control.

The key manufacturing process for thermal bimetal involves the composite technology between each layer. Common composite methods include hot rolling, cold rolling, explosion bonding, and double pouring molten methods. Hot rolling is the most commonly used method, where each layer of slab is compounded at high temperatures with significant hot rolling, followed by cold rolling. The cold rolling method produces the highest quality products, where different alloy layer slabs are compounded at room temperature with large reduction cold rolling, then processed through conventional cold rolling. Thermal bimetal is typically supplied in strip or sheet form.

Shanghai Tankii Alloy Material Co., Ltd. specializes in the production of thermal bimetal alloys, nickel chromium alloys, copper nickel alloys, iron chromium alloys, and other precision alloys. Our comprehensive manufacturing process includes smelting, hot rolling, cold rolling, drawing, and heat treatment, all under strict production process control. The company has obtained both quality system certification and environmental protection system certification, operating under the principle of "honest, quality first" while pursuing technological innovation and creating premium alloy brands.