Copper nickel alloy large-size thick-wall seamless pipe manufacturing process

Abstract

The invention discloses a copper nickel alloy large-size thick-wall seamless pipe manufacturing process which comprises steps as follows: a B10 alloy cast ingot used as a raw material is subjected to forging or rotary piercing, and then machined to prepare the qualified pipe blank; and the pipe blank is subjected to spin forming to prepare the qualified pipe. The length of the fai270 pipe is more than 3.5m, and the length of the fai340 pipe is more than 1.5m. The prepared pipe has the same mechanical properties and technical properties as the thin-wall pipe, has the average grain diameter of 0.01-0.05mm, has favorable cold / hot working and welding properties, and can be made into elbows, T-joints, reducer pipes and other pipes at low cost. The invention is applicable to the ship sea water pipe system,, fills up the blank in China, and has broad market prospects in the aspects of novel ship sea water pipeline and other high-pressure pipeline materials in future.

Description

technical field [0001] The invention relates to a technique in the field of copper alloys, in particular to a process for manufacturing copper-nickel alloy large-scale thick-walled seamless pipes. Background technique [0002] BFe10-1-1 alloy has good cold and hot processing properties and excellent corrosion resistance, and is widely used in foreign ship seawater piping systems. After many years of scientific research and actual ship verification of BFe10-1-1 alloy, my country's marine BFe10-1-1 alloy has achieved localization and independent supply, and BFe10-1-1 thin-walled seamless pipes can be supplied The specifications are Φ8mm~Φ324mm. At present, BFe10-1-1 pipes are widely used in my country's surface ship seawater piping systems, and the use effect is good. In recent years, with the increase of the seawater flow rate in the ship's seawater pipeline, the pressure bearing capacity and corrosion allowance requirements of the pipeline system have also been greatly impro...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a copper-nickel alloy large-scale thick-walled seamless pipe manufacturing process. In view of the high pressure in the seawater pipeline of some new ships, and the problem that the existing domestic pipes cannot meet the design requirements, forging is adopted. Or skew rolling and piercing and then machining to prepare the tube blank, and then through the spinning forming process test, prepare the BFe10-1-1 pipe material with dimensional deviation meeting the design requirements, mechanical properties and grain size qualified, providing materials for new ship design Support to meet the design and use requirements of new ships