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A kind of preparation method of high-quality hafnium bar material

A high-quality, bar technology, used in temperature control, metal rolling, etc., can solve problems such as poor structure uniformity, and achieve the effects of short processing process, reduced processing cost, excellent mechanical properties and corrosion resistance

Active Publication Date: 2017-05-24
西安诺博尔稀贵金属材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, steel pipes and copper tubes are used to double-coat the hafnium billets, which greatly improves the extrusion lubrication effect. Extrusion overcomes the problems of traditional hafnium billet single cladding and high-temperature extrusion on the extrusion die and poor uniformity of the extruded billet structure, and can obtain uniform structure, dimensional tolerance within 0.5mm and surface quality good extruded billet

Method used

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  • A kind of preparation method of high-quality hafnium bar material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this example, a hafnium rod with a diameter of Φ97 mm forged by a conventional forging method is used as a raw material to prepare a hafnium rod with a diameter of Φ15.5 mm. The preparation method includes the following steps:

[0027] Step 1. Coating steel pipes on the hafnium billets, and then covering the steel pipes with copper tubes to obtain double-coated hafnium billets; the steel pipes are A3 steel pipes; the unilateral assembly of the steel pipes and the copper pipes The thickness is 1.0mm;

[0028] Step 2. Heat the double-coated hafnium billet described in step 1 to 850°C and keep it warm for 90 minutes; preheat the extrusion die to 350°C, and extrude the double-sheathed hafnium billet after heat preservation. The cylinder diameter is Φ100mm, the extrusion ratio is 10, and the extrusion speed is 80mm / s, and an extruded billet with a diameter of Φ31.5mm is obtained;

[0029] Step 3, removing the copper pipe and steel pipe covered by the extruded billet desc...

Embodiment 2

[0035] In this embodiment, a hafnium bar blank with a diameter of Φ97 mm forged by a conventional forging method is used as a raw material to prepare a hafnium bar with a diameter of Φ15 mm. The preparation method includes the following steps:

[0036] Step 1. Coating a steel pipe on the hafnium billet, and then coating a copper pipe on the steel pipe to obtain a double-coated hafnium billet; the steel pipe is an A3 steel pipe (other grades of steel pipes can also be used); the steel pipe The total thickness of one side of the copper tube and the copper tube is 1.2mm;

[0037] Step 2. Heat the double-coated hafnium billet described in step 1 to 900°C and keep it warm for 90 minutes; preheat the extrusion tool and die to 350°C, and extrude the double-sheathed hafnium billet after heat preservation. The barrel diameter is Φ100mm, the extrusion ratio is 12.7, the extrusion speed is 60mm / s, and the extruded billet with a diameter of Φ28mm is obtained;

[0038]Step 3, removing the...

Embodiment 3

[0044] In this example, a hafnium rod with a diameter of Φ96 mm forged by a conventional forging method is used as a raw material to prepare a hafnium rod with a diameter of Φ13.5 mm. The preparation method includes the following steps:

[0045] Step 1. Coating a steel pipe on the hafnium billet, and then coating a copper pipe on the steel pipe to obtain a double-coated hafnium billet; the steel pipe is an A3 steel pipe (other grades of steel pipes can also be used); the steel pipe The total thickness of one side of the copper tube and the copper tube is 1.5mm;

[0046] Step 2. Heat the double-coated hafnium billet described in step 1 to 950°C and keep it warm for 60 minutes; preheat the extrusion die to 370°C, and extrude the double-sheathed hafnium billet after heat preservation. The cylinder diameter is Φ100mm, the extrusion ratio is 16, and the extrusion speed is 50mm / s, and an extruded billet with a diameter of Φ25mm is obtained;

[0047] Step 3, removing the copper pipe...

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Abstract

The invention discloses a high-quantity hafnium rod manufacturing method. The method includes the steps that a hafnium rod blank is wrapped with a steel pipe, then the steel pipe is wrapped with a copper pipe, and the double-wrapped hafnium rod blank is obtained; secondly, the double-wrapped hafnium rod blank is extruded after the rod blank is heated and the temperature is kept, and the extruded rod blank is obtained; thirdly, the copper pipe and the steel pipe wrapping the extruded rod blank are removed, and then the extruded rod blank is subjected to vacuum annealing treatment; fourthly, under the condition that the extruded rod blank is heated continuously in the atmosphere, the extruded rod blank is rolled through a heat pipe rolling machine; fifthly, oxide coatings are removed, then the extruded rod blank is straightened, ground and polished in sequence, and a semi-finished hafnium rod is obtained; and sixthly, vacuum annealing treatment is conducted, and a finished high-quality hafnium rod is obtained. By the high-quantity hafnium rod manufacturing method, the hafnium rod blank is double-wrapped before being extruded, and the hafnium rod blank is rolled through the heat pipe rolling machine under the condition that the extruded rod blank is heated continuously in the atmosphere, and the hafnium rod with the dimensional deviation ranging from -0.02 mm to 0.02 mm, the ovality smaller than or equal to 0.02 mm and excellent mechanical property and corrosion resistance and of an even structure can be obtained.

Description

technical field [0001] The invention belongs to the technical field of hafnium material processing and preparation, and in particular relates to a method for preparing high-quality hafnium rods. Background technique [0002] Metal hafnium has good thermal neutron and epithermal neutron absorption capacity, and its thermal neutron absorption cross section can reach 115b (1b=10 -28 m 2 ), which is 600 times that of zirconium. At the same time, metal hafnium also exhibits excellent mechanical properties and corrosion properties, so it is an ideal nuclear reactor control material. [0003] With the continuous improvement of the requirements for nuclear control materials, designers and users have put forward higher requirements for hafnium control materials, including high-temperature mechanical properties, corrosion properties and surface quality, etc., to ensure long-term stable service of hafnium materials at high temperatures , high pressure, and nuclear radiation conditio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/04B21C23/22B21B1/16B21B37/74
CPCB21B1/16B21B37/74B21C23/22B21C37/04
Inventor 刘杨张录强武宇宜楠赵鸿磊周龙海姚修楠权振兴李俊沈大吉孙毅
Owner 西安诺博尔稀贵金属材料股份有限公司
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