A kind of production method of high-strength corrosion-resistant pb-sn composite coating strap

Abstract

The invention provides a high-intensity and corrosion-resistant Pb-Sn composite coating binding band. The binding band comprises the following components in percentage by weight: 0.10 to 0.20% of C, 0.50 to 1.20% of Mn, not greater than 0.010% of Si, not greater than 0.010% of P, not greater than 0.010% of S, 0.010 to 0.030% of B, and 0.030 to 0.070% of Als. The production method comprises the following steps: smelting; continuously casting to form a blank; heating the blank by the conventional method; performing hot rolling; pickling by the conventional method; performing cold rolling; manufacturing into the band. According to the high-intensity and corrosion-resistant Pb-Sn composite coating binding band and the production method, the binding band is 0.9mm in thickness, the tensile strength is not less than 1.050MPa, the percentage of elongation is not less than 9%, and the repeated bending time is not greater than 8 times (R=5mm); a Pb-Sn composite coating that is uniform, dense, high in attaching force, about 4 microns in thickness, beautiful and glossy is produced on the surface of the binding band; the binding band is not obviously rusted within 480 days under indoor atmosphere environment, and the use requirement is completely met; in addition, the surface of the binding band is small in hardness, relatively soft, and nearly does not damage precise electronic elements.

Description

technical field [0001] The invention relates to a production method of a strap, in particular to a production method of a strap with a high-strength corrosion-resistant Pb-Sn composite coating. Background technique [0002] High-strength corrosion-resistant strapping is a cold-rolled deep-processing product with high added value and broad market prospects. As a material carrier for "guaranteeing safe storage and transportation and improving product quality", it is widely used in steel, non-ferrous metals, building materials, and textiles. Processing and other fields, with good mechanical properties and strong corrosion resistance. [0003] At present, the raw materials for producing high-strength straps at home and abroad are mainly low-alloy steel, alloy structural steel and high-quality carbon structural steel. The production process mainly includes three methods: stress relief annealing, two-phase zone quenching + tempering, lead bath isothermal quenching + tempering. T...

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Problems solved by technology

[0004] However, the lead bath isothermal quenching + tempering process also has two obvious disadvantages: First, because the temperature of the lead bath is generally 350~450°C, after quenching, the surface of the strap is easily covered with a layer of Pb with a thickness of about 0.1~0.3μm. , somewhat similar to hot-dipped lead

The existing problem is also the high content of C and Si in the raw steel grades, resulting in weak adhesion of the paint film, which greatly affects the corrosion resistance of the product and shortens its service life

In addition, once the paint film falls off, the Pb existing on the surface may pollute the environment

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