A kind of high-iron cupronickel alloy pipe material and its short-process production method

Abstract

The invention relates to a high-iron cupronickel alloy pipe and a short-process production method thereof, and belongs to the technical field of metal materials. Compared with a BFe10-1-1 alloy, the cupronickel alloy BFe10-2-1 provided by the invention is increased in alloy iron element content from 1.0wt%-1.5wt% to 1.6wt%-2.5wt%, thereby greatly enhancing the corrosion-resistant property and mechanical property of the alloy. According to the short-process production method, a pipe billet with high inner-outer surface quality and high-axial orientation columnar crystal structure is prepared by adopting a heat-cold combined casting horizontal continuous casting technology, so that the cold machining property of high-iron cupronickel is greatly enhanced; the continuous casting pipe billet is directly subjected to cold rolling and / or cold-draw forming, a pipe is subjected to finished product annealing by adopting a proper annealing schedule to eliminate microsegregation, the average size of a recrystallized grain is controlled to 20-40 micrometers, the volume fraction of a precipitated phase is reduced to be less than 2%, so that the cupronickel pipe with excellent mechanical property and corrosion-resistant property is obtained. Compared with a BFe10-1-1 pipe produced through the traditional method, the BFe10-2-1 high-iron cupronickel pipe disclosed by the invention has the advantages of more excellent integral using property, short production process and high production efficiency and finished product rate.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a high-iron white copper pipe and a short-flow production method thereof. Background technique [0002] Iron-containing nickel-nickel alloy (referred to as iron-nickel) pipes have high strength, good thermal conductivity and corrosion resistance, and are widely used in condenser tubes and heat exchanger tubes in thermal power, ships, seawater desalination and other fields. Among them, the BFe10-1-1 alloy pipe has low nickel content (~10wt%) and low cost, and is currently the most widely used iron-nickel-nickel pipe in industry. With the rapid development of my country's marine industry, higher and higher requirements are put forward for the corrosion resistance and service life of iron-nickel copper used in seawater piping systems. The traditional BFe10-1-1 pipes are difficult to meet the requirements. [0003] Increasing the nickel content (such as BFe30-1-1 alloy with a ...

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Problems solved by technology

[0007] The object of the present invention is to provide a kind of novel high-iron cupronickel alloy BFe10-2-1, iron content is improved to 1.6~2.5wt% by 1.0~1.5wt% of BFe10-1-1, the content of nickel and manganese and BFe10-1- 1, the mechanical properties and corrosion resistance of the alloy can be greatly improved; the high-iron-nickel-nickel tube billet is prepared by horizontal continuous casting of hot-cold combined casting molds, so as to solve the problems of poor processability and low yield of iron-nickel-nickel copper after the iron content increases; Adopt appropriate cold working (cold rolling and / or cold drawing) process and finished annealing system to control the recrystallization structure and precipitated phase content, overcome microscopic segregation to improve composition uniformity, and make the pipe have good mechanical properties and corrosion resistance.

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