High-uniformity tin-phosphor bronze strip preparation process

Abstract

The invention belongs to the technical field of bronze strip manufacturing, and particularly relates to a high-uniformity tin-phosphor bronze strip preparation process. The high-uniformity tin-phosphor bronze strip preparation process comprises the following steps of S1, smelting, S2, casting, S3, milling, S4, homogenizing heat treatment, S5, cold rough rolling, S6, intermediate annealing, S7, cold intermediate rolling, S8, cold finish rolling, and S9, finished product annealing. According to the technical scheme, the smelting process can improve the component and structure uniformity of a casting blank, the gas content in melt can be effectively reduced, meanwhile, the components in a smelting furnace are uniformly distributed, and the burnout rate of alloy elements is low; and in the subsequent processing process, microsegregation forms such as intragranular segregation and grain boundary segregation can be eliminated by promoting the high-temperature diffusion process, a recrystallization structure is controlled and residual stress is reduced through a combined deformation heat treatment process, the microsegregation and stress distribution uniformity of the alloy is further improved, so that a tin-phosphor bronze strip with good structure and performance uniformity is obtained.

Description

technical field [0001] The invention relates to the technical field of bronze strip manufacturing, in particular to a process for preparing a high uniformity tin phosphor bronze strip. Background technique [0002] Since high Sn content tin phosphor bronze has excellent strength, elasticity, anti-magnetic, wear-resistant, corrosion-resistant, it is widely used in structural devices that require elasticity, wear-resistant, anti-magnetic and other properties. Since the temperature difference between the liquidus and the solidus of the alloy is as high as 140-160 °C, coarse dendrites are easily formed during the solidification process, and Sn element segregation occurs, forming a scaly hard brittle region, and the brittle phase has a gray-white appearance. The alloy has a blue-gray surface, which affects the appearance of the product. In addition, because the alloy is difficult to hot work, it is impossible to eliminate the porosity, segregation and columnar grain structure in...

AI Technical Summary

Problems solved by technology

Since the temperature difference between the liquidus line and the solidus line of the alloy is as high as 140-160 °C, coarse dendrites are easily formed during the solidification process, and Sn element segregation occurs, forming a scaly hard and brittle region. The brittle phase has an off-white appearance. The alloy presents a blue-gray surface, which affects the appearance of the product

In addition, because the alloy is difficult to be hot-worked, it is impossible to eliminate the porosity, segregation, and columnar grain structure in the cast structure by hot rolling, and continuous cold working can easily lead to uneven distribution of stress and strain, resulting in significant structure and performance in subsequent processing. Inhomogeneity affects downstream product use and reduces product quality stability