Production process for nuclear high-quality stainless steel medium-thickness plate

Abstract

The invention discloses a production process for a nuclear high-quality stainless steel medium-thickness plate, and the production process specifically comprises the following steps of smelting, rolling, pickling, surface visual detection, unqualified product grinding and flaw detection, solid-solution treatment, pickling, surface visual detection and qualified product marking. According to the production process disclosed by the invention, pickling is firstly performed on a hot-rolled steel plate after a rolling process, and secondary oxide iron scale generated in the rolling process is removed, so that scratches and press-in defects generated on the lower surface of the steel plate in links such as a transportation roller path, a cold bed, offline transportation and transportation afterrolling is ended are avoided, the number of pickling times after solid-solution treatment is reduced, and the occurrence of a surface roughness phenomenon of the steel plate after pickling is avoided;a stainless steel product produced by the production process is good in surface quality, is uniform in color and luster, is high in product once qualification rate and demand rate, and greatly improves steel plate pickling efficiency and surface quality; and with the adoption of the production process, the once qualification rate of the steel plate is increased to be 95% or higher from 70%, the number of steel plates needing re-pickling is reduced, and production continuity and product quality stability can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of stainless steel production, and in particular relates to a production process of high-quality stainless steel plate for nuclear use. Background technique [0002] At present, the commonly used nuclear stainless steel plates are 304, 304L, 321 and other austenitic stainless steels and 2101, 2205 and other duplex stainless steels. Nuclear stainless steel plates have a high impact on the chemical composition, mechanical properties and surface quality of steel plates. Requirements, after smelting, the surface of the continuous casting billet needs to be cleaned, and then rolled in a reversible plate rolling mill. After hot rolling, solution treatment and pickling are required. After solution treatment, there is a large amount of oxide scale on the surface of the steel plate, which requires The oxide scale is removed by pickling. Austenitic stainless steel such as 304, 304L and 321 can be pickled once after ro...

AI Technical Summary

Problems solved by technology

[0004] The oxide scale formed on the surface of the continuous casting slab during the heating process, and the secondary oxide scale is formed during the rolling process. After rolling, it may be carried out in the transportation roller table, cooling bed, off-line lifting, transportation, solution treatment and other links. Scratches and press-in defects occur on the lower surface of the steel plate. Such defects will be obvious after the steel plate is pickled and seriously affect the product quality. The defects need to be polished and tested for penetration. After passing the test of level I, the steel plate should be pickled again ; There is obvious color difference between the polished part and the normal part after pickling, and the user's visual experience is very poor. The logistics is not smooth, and the cost of pickling has increased; Fourth, the cashing cycle of orders has increased