Ultra pure electroslag remelting method for high-performance corrosion resistant alloy

Abstract

The invention relates to an ultra pure electroslag remelting method for a high-performance corrosion resistant alloy, and the method comprises the following steps of: preparing the following ingredient components of a self-fluxing electrode bar in parts by weight: 25-34 parts of Ni, 25-29 parts of Cr, 2.5-4.5 parts of Mo and 30-45 parts of Fe, and carrying out vacuum induction melting, so as to obtain the self-fluxing electrode bar; slowly melting the self-fluxing electrode bar in melted electroslag remelting slag charge comprising the following components in parts by weight: 55-80 parts of CaF2, 5-25 parts of CaO, 5-15 parts of Al2O3 and 5-10 parts of MgO, purifying, and recrystallizing in a crystallizer, so as to obtain an electroslag ingot; and forging the electroslag ingot into a bar material at the temperature of 1130+ / -5 DEG C, and carrying out solution treatment, so that the high-performance corrosion resistant alloy is obtained. By utilizing the ultra pure electroslag remelting method provided by the invention, the content of harmful elements such as sulphur and phosphorus in the alloy can be reduced, the impurity distribution of the alloy is improved, fining of structure can be facilitated, and the hot workability and yield of the alloy can be improved.

Description

technical field [0001] The invention relates to the field of metallurgical smelting, in particular to an ultra-pure electroslag remelting method for high-performance corrosion-resistant alloys. Background technique [0002] High-performance corrosion-resistant alloys used in the field of oil and gas exploration and production refer to those alloys that can meet the needs of deep sea and deep well oil and gas fields, and have excellent comprehensive properties such as mechanics and corrosion resistance, and at the same time have the ability to resist H 2 S, CO 2 , Cl - A cost-effective alloy for comprehensive strong acid corrosion. Due to the high alloy content, high-performance corrosion-resistant alloys have serious segregation, especially for large-scale products. The common electroslag remelting process is prone to severe segregation, resulting in uneven structure and easy precipitation of σ-brittle phases, especially in the thermal processing temperature zone. The ran...

AI Technical Summary

Problems solved by technology

Due to the high alloy content, high-performance corrosion-resistant alloys have serious segregation, especially for large-scale products. The common electroslag remelting process is prone to severe segregation, resulting in uneven structure and easy precipitation of σ-brittle phases, especially in the thermal processing temperature zone. The range is narrow, the high-temperature thermoplasticity is poor, and cracks are prone to occur during thermal processing, which eventually leads to an extremely low yield of thermal processing. The yield of high-performance corrosion-resistant alloys produced by ordinary electroslag remelting processes generally does not exceed 70%.