CN1026502C

CN1026502C - Tube joiner of iron base marmem and its production method

Info

Publication number: CN1026502C
Application number: CN 92109530
Authority: CN
Inventors: 王绪; 杨弟; 韩其勇
Original assignee: University of Science and Technology Beijing USTB
Current assignee: University of Science and Technology Beijing USTB
Priority date: 1992-08-20
Filing date: 1992-08-20
Publication date: 1994-11-09
Anticipated expiration: 2007-08-20
Also published as: CN1070693A

Abstract

The present invention relates to a shape memory alloy pipe joint which is formed by iron base shape memory alloy via heat processing and cold processing. The present invention is characterized in that the purpose of pipe connection is reached by using a memory function of representing diameters with different sizes of the shape memory alloy at different temperature; the pipe joint can be connected with a metal pipe and a nonmetal pipe; special processing is not needed to the pipes during the connection, and the connection is completed only by heating to restore the shape. The pipe joint has processing technology: homogenizing annealing of cast ingot; hot rolling to obtain a seamless tube in a needed size or to obtain a plate band which is then welded into a seam pipe; processing shape memory, and cold (warm) expanding the tube; cutting into pipe joints with needed lengths. A plurality of pipes are connected only by heating with a heater.

Description

Tube joiner of iron base marmem and its production method

The present invention relates to a kind of iron-base marmem pipe joint and process, be suitable for any metal and be connected with nonmetal pipeline by iron-base marmem.Be specially adapted to cated metal tube, metal is connected with non-metallic pipe, only gets final product with well heater during connection, and is the most convenient to the pipe connection of various pressure.

Chemical industry, need in the petrochemical iy produced and will have corrosive gas, liquid is transported to certain production link or these liquid is transported to the user, these gas in course of conveying, liquid is intensive very to Corrosion of Pipeline, for addressing this problem, the scientific worker has taked some required measure to pipeline, as applying one deck protective system at pipe interior, these measures have solved the anticorrosion problem of pipeline itself, but two class problems have appearred, one when pipe connection. the welding of adopting during the metal-metal pipe connection, be threaded, ring flange connects the coating damage of equal butt junction place and causes leakage.Two. metal-nonmetal connection is difficult to adopt welding process, ring flange, is threaded also and can causes leaking to the coating damage of metal tube, and annual Sinopec department reaches several hundred million yuan because of pipeline connection place spill losses, suddenly for this reason waits to take other method of attachment.

The leakage that U.S. F14 air fighter uses the Ti-Ni marmem pipe joint to stop hydraulic efficiency system, but the price of Ti-Ni alloy is high limited industry, agricultural, military and civilian on use, Ti-Ni marmem pipe joint processing simultaneously, complex treatment process, therefore reduce the tube stub price, simplified processing process is anxious to be solved.

The objective of the invention is to propose a kind of iron-base marmem pipe joint of cheapness and the complete processing of simplification, this tube stub is through smelting thermo forming, after the cold-drawn reaming, use again, more than certain temperature, remember original shape, and do not damage connected pipe when reaching connecting tube fast, metal and nonmetal pipeline spare ease of connection is carried out, do not need connected pipe processing, handle, only need a heating unit can finish this work, not only low pressure pipeline can be connected, and pressure piping can be connected.

The cheap marmem pipe joint composition that the present invention proposes is (weight): (1) 25～40%Mn, and 2～6%Si, 0.02～3%W, surplus is Fe, (2) 10～40%Mn, 2-8%Si, 4～12%Cr, 5～20%Ni, 0.01-3%W, 0.02～0.1%C is surplus to be Fe.Through smelting, rolling, cold expander, be heated to then conduit connectable of Af point, institute's connecting tube size can be complementary with tube stub, tube stub girth recovery rate is 4～6%.

Shape memory alloy used in the present invention is smelted after 1000 ℃～1200 ℃ soaking 12 hours through one of electric furnace, open hearth, converter, vacuum induction furnace, be rolled into rod or plate at 800～1180 ℃, rod is rolled into the seamless tube of certain specification through seamless-tube rolling mill, behind sizing under 600～800 ℃ of states, cool off fast or reheat 600～800 ℃ of shrends, hot-rolled tube cuts into the length of requirement after cold (temperature) hole enlargement of 5～10%.Finish pipe behind the also available hot rolling plate cold stretching and be welded into tube stub.The tube stub of making is positioned on the connected tube joint, shape, fastening pipeline simultaneously when making tube stub memory hot-work with electrical heating method.Tube stub as shown in Figure 1,1 is the tube stub shape before recovering, 2 are the shape after recovering.

Employed electric heater is made up of two and half tubular heating units.As shown in Figure 2, among Fig. 21 be resistance wire, 2 for special-shaped refractory materials, 3 for support shell, 4 for hinge, 5 for handle.

Claims

1, a kind of iron-base marmem pipe joint is characterized in that chemical ingredients is (weight): Mn25～40%, Si2～8%, and C0.02～0.1%, 0.01～3%W, all the other are Fe.

2, a kind of iron-base marmem pipe joint is characterized in that chemical ingredients is (weight): Mn10～40%, Si2～8%, and Cr4～12%, Ni5～20%, W0.01～3%, C0.02～0.1%, all the other are Fe.

3, the production method of claim 1 or 2 described marmem pipe joints, it comprises: 1000～1200 ℃ of homogenizing annealings of ingot casting, and 800～1180 ℃ are rolled into pipe, handle through shape memory then, cold (temperature) expander is to requiring diameter, cut into to require length.