Method for preparing high-performance tin phosphorus bronze band

Abstract

The invention provides a method for preparing a high-performance tin phosphorus bronze band. The method comprises the following steps of: dosing, melting, stirring, removing slag, analyzing by sampling and regulating ingredients; then carrying out horizontal continuous casting, thus a tin phosphorus bronze band coil billet with the thickness of 14.0-16.5mm, the width of 210-430mm, and the length of 45-68m is obtained by pulling, stopping and reversely returning; carrying out face milling, reducing the thickness of each face by 0.5-0.8mm through milling, rolling the coil band until the thickness of 3.4-9mm through primary direct cogging; carrying out crude rolling until the thickness of 1.2-4.5mm on the coil band after the primary intermediate annealing; carrying out acid pickling and passivation on the coil band after secondary intermediate annealing; and finally carrying out cold precision rolling, low-temperature thermal treatment of a finished product, surface acid pickling and passivation and stretch bending and leveling, wherein the band thickness after the cold precision rolling is 0.06-1.2mm, namely the band thickness of the finished product. Through utilizing the method provided by the invention, the billet uniform annealing working procedure is omitted, the production cost is lowered, and the production cycle is shortened.

Description

technical field [0001] The invention relates to a preparation method of a tin-phosphorus bronze strip, in particular to a method for producing a high-performance tin-phosphorus bronze strip by direct cold blanking. Background technique [0002] Tin phosphor bronze containing more than 4% tin is usually not hot-rolled because of its narrow thermoplastic temperature range and severe hot-rolling cracking. Mainly due to the characteristics of the chemical composition of tin phosphor bronze, the cast tin phosphor bronze strip blank has serious reverse segregation phenomenon and casting internal stress. The reverse segregation leads to uneven chemical composition and plasticity decline of the strip, and casting stress leads to obvious plasticity decline and deformation. Resistance has also increased. However, the traditional methods both at home and abroad use strip uniform annealing to eliminate segregation, improve strip plasticity, and reduce rolling force. That is to say, mo...

AI Technical Summary

Problems solved by technology

However, the strip homogenization annealing in the above-mentioned production process is a rather time-consuming and power-consuming process, which is usually carried out in a bell furnace

The uniform annealing temperature of the blank is 670-710°C, generally 16-20 hours. Each ton of tin bronze strip consumes about 100 degrees of electricity, 1.5 liters of liquid nitrogen, and 1.2 kg of liquid ammonia, which greatly improves production costs and economic benefits. relatively poor

[0003] With the existing industrial technology, no matter how high the homogenizing annealing temperature and how long the holding time is used, there is no obvious improvement effect on the regional segregation. The homogenizing annealing of the billet can only eliminate the intragranular segregation and eliminate the casting internal stress.

The intragranular segregation can be completely eliminated by several times of intermediate annealing, but because the plasticity of the general casting strip is too low, the edges are broken after rolling, and there are many broken strips, which reduces the yield. If the processing rate of cold billet rolling is too small, If the thickness after rolling is too large, it will inevitably increase the number of intermediate annealing in the future, and the economic benefit is not very obvious

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