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A preparation method of corrugated interface steel-titanium composite pipe

A technology for composite pipes and titanium pipes, which is applied in the field of bimetal composite pipe material preparation, can solve the problems of low composite interface strength, low interface cleanliness, uneven performance, etc., and achieves optimized design, simple and easy preparation method, and good sealing performance. Effect

Active Publication Date: 2020-05-26
CENT IRON & STEEL RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above analysis, the embodiment of the present invention aims to provide a method for preparing a steel-titanium composite pipe with a corrugated interface, which is used to solve the problems of low interface cleanliness and straight interface in the preparation of metallurgical bonded bimetallic composite pipes by the existing diffusion compounding method. The technical problem interface that makes the composite interface low in strength, uneven in performance, and poor in formability

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  • A preparation method of corrugated interface steel-titanium composite pipe
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  • A preparation method of corrugated interface steel-titanium composite pipe

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preparation example Construction

[0037] The invention provides a method for preparing a corrugated interface steel-titanium composite pipe, such as Figure 1 to Figure 4 As shown, the corrugated interface steel-titanium composite pipe includes a steel pipe 1 arranged on the outer layer and a titanium pipe 2 arranged on the inner layer, and its preparation method includes the following steps:

[0038] S1. Process the inner surface of the steel pipe 1 and the outer surface of the titanium pipe 2 into convex annular corrugations or double-sided annular spiral corrugated grooves by rolling process;

[0039] S2. Using degreasing and pickling processes to remove impurities and oxides on the surface of the steel pipe 1 and the titanium pipe 2;

[0040] S3. After putting the titanium tube 2 and the steel tube 1 together, insert the mandrel 10 into the titanium tube 2, and use a drawing process to make the titanium tube 2 and the steel tube 1 form an interference mechanical fit;

[0041] S4. Put solid powder in the ti...

Embodiment 1

[0057] S1. A Q235 steel pipe 1 with an outer diameter of Φ110mm, a wall thickness of 10mm, and a length of 1m and a TA2 titanium pipe 2 with an outer diameter of Φ89mm, a wall thickness of 4mm, and a length of 0.95m were selected as the composite outer and inner pipes, respectively. The inner surface of the steel pipe 1 and the outer surface of the titanium pipe 2 are processed into a convex annular corrugated channel by using a special rolling process. The distance between the peak and the trough of the corrugated channel is 0.5mm, and the wave pitch is 2mm;

[0058] S2. Embedding the TA2 titanium pipe 2 into the Q235 steel pipe 1 for pre-assembly and checking for dimension matching. After being successfully embedded, the steel pipe 1 and the titanium pipe 2 are dipped in NaOH solution with a temperature of 80-90° C. and a mass percent of 10% for 5-10 minutes to remove grease on the metal surface. After rinsing with clean water, use 15% HCl solution and 4% HF+10% HNO respecti...

Embodiment 2

[0066] S1. Select Q345 stainless steel pipe 1 with an outer diameter of Φ89mm, a wall thickness of 6mm, and a length of 2m, and a TA2 titanium pipe 2 with an outer diameter of Φ76mm, a wall thickness of 3mm, and a length of 1.9m as the composite outer pipe and inner pipe respectively. . The inner surface of the steel pipe 1 and the outer surface of the titanium pipe 2 are processed into a double-sided annular spiral corrugated channel by using a special rolling process. The distance between the peak and the trough of the corrugated channel is 1.5mm, and the wave pitch is 5mm;

[0067] S2. Embedding the TA2 titanium pipe 2 into the Q345 steel pipe 1 for pre-assembly and checking the size matching. After being successfully embedded, the steel pipe 1 and the titanium pipe 2 are dipped in NaOH solution with a temperature of 80-90° C. and a mass percent of 10% for 5-10 minutes to remove grease on the metal surface. After rinsing with clean water, use 15% HCl solution and 4% HF+10%...

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Abstract

The invention relates to a preparation method of a corrugated interface steel-titanium composite tube, belongs to the technical field of bimetal composite tubes, and solves the technical problem thatin an existing diffusion composite method, an interface is low in cleanliness and straight, which leads to the strength of a composite interface is low and the forming performance is poor. The preparation method of the corrugated interface steel and titanium composite tube comprises the following steps of S1, machining the inner surface of a steel tube and the outer surface of a titanium tube to form convex annular or double-sided annular spiral corrugated grooves; S2, cleaning impurities and oxides on the surfaces of the steel tube and the titanium tube; S3, making the titanium tube and the steel tube form mechanical interference fit; S4, placing solid powder into the titanium tube, and sealing the two ends of the titanium tube; S5, vacuumizing the interface of the steel tube and the titanium tube, until the vacuum degree of the interface between the titanium tube and the steel tube reaches 10<-2>Pa or below; S6, placing the steel-titanium composite tube blank into an annealing furnace to carry out diffusion annealing treatment; and S7, cutting off the head and tail part of the steel-titanium composite tube to obtaine a finished composite tube. The steel-titanium composite tube prepared by the preparation method disclosed by the invention realizes steel and titanium interface metallurgical bonding, the binding rate is 100%, and the shearing strength is greater than 250 MPa.

Description

technical field [0001] The invention relates to the technical field of bimetal composite pipe preparation, in particular to a method for preparing a corrugated interface steel-titanium composite pipe. Background technique [0002] Steel-titanium composite pipe has both the corrosion resistance of titanium and the low-cost advantages of steel, and has significant economic benefits. It can be widely used in petroleum, chemical, shipbuilding, marine engineering and other fields, and has broad application prospects. From the interface bonding type of titanium pipe and steel pipe, it can be divided into mechanically bonded composite pipe and metallurgical bonded composite pipe. Mechanically bonded composite pipes are mainly formed through cold drawing, extrusion and other processes. This method has disadvantages such as low bonding strength and poor process performance. [0003] The metallurgical composite pipe preparation methods mainly include: centrifugal casting method, expl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/15B21C37/30
Inventor 柴希阳柴锋王天琪罗小兵潘涛师仲然李丽梁丰瑞段美琪
Owner CENT IRON & STEEL RES INST
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