High boron content austenite stainless steel and preparation method thereof

Abstract

The invention relates to high boron content austenite stainless steel which comprises the following chemical components in percentage by weight: no more than 0.05% of C, 1.7-2.0% of B, no more than 1.0% of Si, no more than 2.0% of Mn, no more than 0.035% of P, no more than 0.030% of S, 12.5-15.0% of Ni, 18.5-21.0% of Cr, no more than 0.5% of Mo, no more than 0.05% of N, no more than 0.15% of Ti, no more than 0.0060% of O, no more than 0.15% of Ce and balance of Fe and inevitable impurities. The preparation method comprises the following steps: the vacuum induction furnace-vacuum consumable furnace technology or vacuum induction furnace-gas-shielded electroslag furnace technology or arc furnace-argon oxygen decarburization (AOD) smelting technology is adopted to smelt stainless steel, die casting is performed, and the cooling speed is greater than 30 DEG C/min; forging and hot rolling are adopted for hot working; and heat treatment and acid pickling are performed to obtain a hot-rolled product. The produced high boron stainless steel hot-rolled product has good mechanical property and neutron absorption property; and no special technological equipment is needed, the production technology is simple and effective, and the production efficiency is high.

Description

technical field [0001] The invention relates to a stainless steel manufacturing process, in particular to an austenitic stainless steel with high boron content and a manufacturing method thereof. Background technique [0002] With the increasingly serious problem of energy shortage in the world and the increasingly prominent environmental problems, green energy such as nuclear power has been paid more and more attention to and vigorously developed by countries all over the world. High-boron austenitic stainless steel has the advantages of excellent neutron absorption performance, long service life, stable and reliable performance, and no need for in-service inspection. It gradually replaces neutron absorption materials such as boron plastics and cadmium as spent fuel storage materials. Neutron absorbing materials are the first choice for grids, nuclear waste fuel storage and transportation containers, and have been widely used. [0003] In order to ensure that spent fuel re...

AI Technical Summary

Problems solved by technology

The hot rolling method of this patent is to reduce or avoid the high boron steel ingot or forging billet by welding the frame around the forging billet. The purpose of high-boron stainless steel hot-rolled edge cracking has achieved certain results, but this method requires the preparation of high-precision groove frame materials and a large amount of welding work, and the frame materials are easy to peel off during the rolling process, resulting in complex production processes and low production efficiency. Low

[0006] Japanese patent JP9269398 discloses a hot-working method for hot-rolling high-boron austenitic stainless steel. The ferrite content of the weld metal layer is 3-12vol.%, the boron content is less than 0.3wt.%, and the thickness is more than 3mm. Finally, it is hot-rolled after heat preservation at 1100-1200°C to reduce hot-rolling edge cracking, but this method In order to ensure a sufficient thickness of the surfacing layer, the number of welding workers is large and welding cracks are prone to occur. When welding cracks occur, t

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