RU2547363C1 - METHOD OF PROCESS PIPES PRODUCTION OF SIZE 284×11 mm OUT OF SOLID BLANK INGOTS TO MANUFACTURE HEX BLANK PIPES WITH TURNKEY SIZE 252,6×5,0+1,5/-1,0×4300+80/-30 mm FOR TIGHT STORAGE AND TRANSPORTATION OF SPENT NUCLEAR FUEL - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention relates to pipes production, in particular to method of process pipes production of size 284×11×26100-26600 mm at pipe-forming installation 8-16" with pilger mills out of bi-metal thought high blank ingots produced by electroslag remelting process of low-ductile steel "04Х14Т5Р2Ф-Ш" with boron content from 2.0 to 3.0% to manufacture hex blank pipes with turnkey size 252.6±1.8×5.0+1.5/-1.0×4300+80/-30 mm for tight storage and transportation of the spent nuclear fuel. The method includes casting by the electroslag remelting process of the ingots with size 480×1800±25 mm out of low-ductile steel "04Х14Т5Р2Ф-Ш" with boron content from 2.0 to 3.0%, with bottom and shrinkable parts out of ductile carbon steels; their height is from 0.04 to 0.05 and from 0.13 to 0.14 respectively of total ingot height, creating during rolling of the process pipes the seed ends and pilger small heads, turning of the outside surface of the electroslag remelting ingots to remove cast defects producing blank ingots with size 465±5×1800±25 mm; in them through central hole is drilled with diameter 100±5.0 mm; they are heated to 1030-1050°C, pierced in a mill for transverse screw rolling into sleeves with size 450×out.295×3080-3140 mm with swaging as per diameter Δ from 2.2 to 4.3% and drawing µ_p from 1.69 to 1.77, sleeves are rolled in the pilger mill in process pipe stocks with size 284×11×26100-26600 mm with drawing µ_sr = 9.61 and swaging as per diameter Δ = 36.2%; from pipes using hot cutting saw the process wastes are cut off, providing pipe ends out of ductile carbon steels with length 600-700 mm, from stub and pilger head side the pipe stocks by the hot cut saw are cut to pipes having multiple length and residue, multiple length pipes and residue are straightened in the six roller machine using the rolling heating temperature, at that the first multiple length pipe and residue are fed to the straightener by ends out of ductile carbon steels, the first multiple length pipe is cut in the machine from side of the carbon steel with length 5300±50 mm and residue, the second multiple length pipe is cut to two pipes with equal length, are bored and turned to the cylindrical blank pipes with size 278.5±1.8×5.0+1.5/-1.0 mm for profiling in hex blank pipes of specified size, sleeves are rolled in the process pipe stocks with size 284×11 mm in gauge 290 mm in mandrel bars with diameter 264/265 mm heated to 500-550°C by rolling of setting carbon sleeves as per the following process: mandrel bar is inserted in the sleeve, front carbon end is rolled with increasing of the sleeve feeding to the deformation area m from 0 to 18 mm, steel "04Х14Т5Р2Ф-Ш" sleeve is rolled under stable process with feed m = 12-14 mm, and rare carbon end, as well as pilger head are rolled with feed m = 18-20 mm. Production of process pipes with size 284×11 mm out of steel "04Х14Т5Р2Ф-Ш" with boron content from 2.0 to 3.0% is ensured to manufacture hex blank turnkey pipes 252.6±1.8×5.0+1.5/-1.0×4300+80/-30 mm for tight storage and transportation of the spent nuclear fuel.

EFFECT: reduced metal consumption, reduced weight of hex blank pipes and racks weight upon simultaneous increased capacity and reliability.

2 cl, 1 tbl

Description

The invention relates to pipe production, in particular to a method for the production of conversion pipes with a size of 284 × 11 × 26100-26600 mm on TPU 8-16 ″ with pilgrim mills from bimetallic billets of electroslag remelting low-plastic steel grade 04X14T5R2F-Sh with boron content from 2.0 to 3.0% for the manufacture of turnkey hexagonal tube blanks 252.6 ± 1.8 × 5.0 + 1.5 / -1.0 × 4300 + 80 / -30 mm for compacted storage and transportation of spent nuclear fuel.

In the pipe industry, there is a known method for the production of conversion tubes for the manufacture of hexagonal tubes of billets of 257 + 2.0 / -3.0 × 6 + 2.0 / -1.0 × 4300 + 80 / -30 mm in size for compacted storage and transportation of spent nuclear fuel, including the production of ingots with boron content from 1.3 to 1.8% by electroslag remelting from low-plastic boron-containing steel, the bottom and shrinkage parts of which, when rolling pig tubes, seeded end and pilgrim head, are cast from plastic carbon steel grades, the ingots are bored and grind it into ingot billets, ingot billets are heated to a plasticity temperature of 1040-1060 ° C, while removing technological waste - pilgrim heads and seed ends from plastic carbon steel grades, sections of pipes from plastic carbon steel grades 500-700 mm long are left, after cutting pipe-lashes into two pipes of equal length or multiple to the length of the billet sets pipes for subsequent warm straightening into a six-roll straightening machine with ends made of plastic carbon steel grades, the ends of pipe blanks made of plastic carbon steel grades of steel are removed before heat treatment with all subsequent process operations (RU No. 2317865, B21B 21/04, published 02.27.2008).

The main disadvantage of this method is that this method extends to the production of conversion tubes from hollow bimetallic ingots of ESR in height with a boron content of 1.3 to 1.8% and does not solve technological problems of conversion tubes from solid ingots of steel grade 04X14T5R2F-Sh with boron content from 2.0 to 3.0%.

The closest in technical essence and the achieved result is a method for the production of conversion pipes with a size of 290 × 12 mm from solid ingots-blanks for the manufacture of hexagonal tubes-blanks with a turnkey size of 257 + 2.0 / -3.0 × 6 + 2.0 / -1.0 × 4300 + 80 / -30 mm for compacted storage and transportation of spent nuclear fuel, including casting by electroslag remelting of ingots 500 × 1825 ± 25 mm in size from low-plastic steel grade 04X14T5R2F-Sh with boron content from 2.0 to 3 , 0%, with bottom and shrinkage parts made of plastic carbon steel ok, the heights of which are respectively 0.04 to 0.05 and 0.12 to 0.13 of the total height of the ingots, forming seed ends and pilgrim heads during rolling of the conversion pipes, turning of the outer surface of electroslag remelting ingots to remove casting defects from production of ingot blanks with a size of 485 ± 5.0 × 1825 ± 25 mm, drilling of a through central hole with a diameter of 100 ± 5.0 mm, heating to a temperature of 1040-1060 ° C, piercing in a cross-helical mill into sleeves of 470 × vn .295 × 2900-3100 mm with a fit in diameter Δ from 2.1 to 4.1% and in with a stretch µ _p from 1.61 to 1.68, rolling the sleeves on a pilgrim mill in a whip pipe of 290 × 12 × 25600-27600 mm in size with a hood µ _pr = 10.03 and a diameter fit Δ = 37.7%, removal from lash pipes by a hot-cutting saw of technological waste, leaving the ends of pipes made of plastic carbon steel with a length of 500-600 mm from the seed side and the pilgrim head, straightening pipe-lashes on a six-roll straightening machine using rolling heating temperature, cutting the hot cutting saw into pipes of multiple lengths and residue, with the first multiple conversion the pipe is cut from the end side of plastic carbon steel into a pipe of 5300 ± 50 mm length and the remainder, the second is cut into two pipes of equal length, a bore and a bore into cylindrical billet pipes, profiling of cylindrical billet pipes into hexagonal billet pipes (RU No. 2470725, B21B 21/00, published December 27, 2012).

One of the main disadvantages of this prototype, as well as the above analogue, is that this method extends to the production of conversion pipes 290 × 12 mm in size from solid billets of steel billets 04Х14Т5Р2Ф-Ш with boron content from 2.0 to 3.0% and does not solve the technological issues of the production of solid billets of steel billets 04Kh14T5R2F-Sh, bimetallic in height, the technology of converting them into TPU with pilgrim mills into conversion tube-lashes of 284 × 11 × 26100-26600 mm in size and the technology of converting them into a shear playing trumpet billet size "turnkey" 252,6 ± 1,8 × 5,0 + 1,5 / -1,0 × 4300 + 80 / -30 mm.

The objective of the proposed method is the development of a new technological process for the production of steel tubes from low ductility steel with boron content from 2.0 to 3.0%, size 284 × 11 mm, increased length on TPU 8-16 ″ with pilgrim mills from solid bimetallic ingot billets for the manufacture of hexagonal tube blanks with a turnkey size of 252.6 ± 1.8 × 0.5 + 1.5 / -1.0 × 4300 + 80 / -30 mm for compacted storage and transportation of spent nuclear fuel, reducing the share technological waste (seed ends, pilgrim heads and defective portions of mother tubes-lashes), exclusion marriage of flaws on the bare ends and pilger heads, a reduction in weight of hexagonal pipes blanks by 20-25% and, therefore, reduced shelving weight while increasing their capacity and reliability.

The technical result is achieved by the fact that in the method for the production of conversion pipes of size 284 × 11 mm from solid ingots-blanks for the manufacture of hexagonal tubes-blanks with a turnkey size of 252.6 ± 1.8 × 0.5.0 + 1.5 / -1.0 × 4300-80 / -30 mm for compact storage and transportation of spent nuclear fuel, including casting by electroslag remelting of ingots of size 480 × 1800 ± 25 mm from low-plastic steel grade 04X14T5R2F-Sh with boron content from 2.0 to 3, 0%, with bottom and shrinkage parts from steel, plastic carbon steel grades, the height of which from 0.04 to 0.05 and from 0.13 to 0.14 of the total height of the ingots, forming seed ends and pilgrim heads during rolling of conversion pipes, turning the outer surface of electroslag remelting ingots to remove casting defects to produce ingot ingots 465 ± 5 × 1800 ± 25 mm in size, in which a through central hole with a diameter of 100 ± 5.0 mm is drilled, they are heated to a temperature of 1030-1050 ° C, stitched in a cross-screw mill in sleeves of 450 × ext. 295 × 3080-3140 mm with compression in diameter Δ from 2.2 to 4.3% and hoods µ _p from 1.69 to 1.77, the sleeves are rolled on a pilgrim mill in a whipping pipe-pipe with a size of 284 × 11 × 26100-26600 mm with an extract µ _pr = 9.61 and a diameter reduction of Δ = 36.2%, from the pipe with a saw technological waste is cut off by hot cutting, leaving the ends of pipes made of carbon steel grades 600-700 mm long, from the seed side and the pilgrim head, the whip pipes by a hot cutting saw are cut into multiple length pipes and the remainder, multiple pipes and the remainder are straightened on a six-roll straightening machine using the temperature of the rolling heat, and the first multiple the first pipe and the remainder are set into the correct machine with ends made of plastic carbon steel grades, the first multiple conversion pipe is cut on the machine from the side of carbon steel with a length of 5300 ± 50 mm and the remainder, the second is allowed at the bottom of the crate pipe of equal length, bored and turned into cylindrical pipes - workpieces with a size of 278.5 ± 1.8 × 5.0 + 1.5 / -1.0 mm for profiling into hexagonal tubes-blanks of a given size, the sleeves are rolled into conversion tube-whips of 284 × 11 mm in caliber 290 mm on mandrels with a diameter of 264/265 mm, heated to a temperature of 500-550 ° C by rolling tuning carbon sleeves, according to the technology: the mandrel is inserted into the sleeve, the front carbon end is rolled in with increasing the feed of the sleeve into the deformation zone m from 0 to 18 mm, the sleeve is rolled from steel 04X14T5R2F-Sh with a steady process with feed m = 12-14 mm, and the rolling of the rear carbon end and the running of the pilgrim head is performed with a feed of m = 18-20 mm.

Comparative analysis with the prototype shows that the inventive method for the production of pig tubes of size 284 × 11 mm from solid ingots-blanks for the manufacture of hexagonal tubes-blanks with a turnkey size of 252.6 ± 1.8 × 0.5.0 + 1.5 / -1.0 × 4300 + 80 / -30 mm for compacted storage and transportation of spent nuclear fuel is characterized in that the casting by electroslag remelting of the ingots is carried out with a size of 480 × 1800 ± 25 mm from low-plastic steel grade 04X14T5R2F-Sh with a boron content of 2, 0 to 3.0%, with bottom and shrinkage parts made of ductile carbon steel steel grades, the heights of which are respectively 0.04 to 0.05 and 0.13 to 0.14 of the total height of the ingots, forming seed ends and pilgrim heads during rolling of the steel tubes, turning the outer surface of the electroslag remelting ingots to remove casting defects of origin with the receipt of ingot blanks with a size of 465 ± 5 × 1800 ± 25 mm, in which a through central hole is drilled with a diameter of 100 ± 5.0 mm, they are heated to a temperature of 1030-1050 ° C, stitched in a cross-helical rolling mill into sleeves of size 450 × ext. 295 × 3080-3140 mm with compression Δ diameter of about 2.2 to 4.3%, and extracts μ _n from 1.69 to 1.77, the liner is rolled on a steel making pilger pipe-lash size 284 × 11 mm × 26100-26600 stretch μ _ave = 9 , 61 and compression in diameter Δ = 36.2%, technological waste is cut off from pipes by a hot cutting saw, leaving the ends of pipes made of carbon steel grades 600-700 mm long, from the seed side and the pilgrim head, the lash pipe is cut by a hot cutting saw to pipes of multiple lengths and residue, multiple pipes and residue are corrected on a six-roll straightening machine using the temperature round heating, the first multiple pipe and the remainder being set into the correct machine by the ends of plastic carbon steel grades, the first multiple transfer pipe is cut on the machine from the side of carbon steel with a length of 5300 ± 50 mm and the remainder, the second is cut into two equal length pipes, bored and grind it into cylindrical billet pipes of size 278.5 ± 1.8 × 5.0 + 1.5 / -1.0 mm for profiling into hexagonal billet pipes of a given size, the sleeves are rolled into conversion pipe-lashes with a size of 284 × 11 mm in caliber 290 mm on mandrels with a diameter of 264 / 265 mm, heated to a temperature of 500-550 ° C by rolling tuning carbon sleeves, according to the technology: insert the mandrel into the sleeve, run the front carbon end with increasing the feed of the sleeve into the deformation zone m from 0 to 18 mm, rolling the sleeve from 04X14T5R2F- steel При With the steady-state process, they are produced with a feed of m = 12-14 mm, and the rear carbon end is rolled and the pilgrim head is rolled in with a feed of m = 18-20 mm. These differences allow us to conclude that the criterion of "inventive step".

Comparison of the proposed method not only with the prototype, but also with other technical solutions in the art did not allow them to identify signs that distinguish the claimed method from the prototype, which corresponds to the patentability "inventive step".

The invention can be illustrated by the following example. To implement the method according to the invention, 10 bimetallic ingot billets (5 heats) of ESR of steel grade 04X14T5R2F-Sh with a boron content from 2.48 to 2.83 of the supply of ZMZ were used. Five ingot blanks with a total mass of 10.345 tons measuring 460-480 × 100 × 1600-1725 mm were subjected to subsequent processing by known technology. Converting pipes were rolled at TPU 8-16 ″ with pilgrim mills of ChTPZ OJSC. Of these ingot billets, 14 hexagonal tube billets with a turnkey size of 252.6 ± 1.8 × 5.0 + 1.5 / -1.0 × 4300 + 80 / -30 mm with a total weight of 2.030 were profiled and accepted t. The average expenditure coefficient of the metal pipes of this batch was 5.097.

Five bimetallic ESH ingot billets with a size of 460-470 × 100 × 1775-1825 mm with a boron content of 2.48 to 2.83% with a total weight of 10.942 tons, with bottom and shrinkage parts made of steel grade 10, the height of which was respectively from 0.04 to 0.05 and from 0.13 to 0.14 of the total height of the ingot (mass of steel 04X14T5R2F-Sh - 9.082 t) were processed in accordance with the invention. The outer surface of ingots with a size of 480 × 1800 ± 25 mm at ZMZ OJSC was turned before removal of defects of foundry origin into ingot blanks measuring 460-470 × 1775-1825 mm. Central ingots with a diameter of 100 ± 5 mm were drilled in ingots-blanks at ChTPZ OJSC. Billet ingots were heated in a methodical furnace to a temperature of 1035 × 1045 ° C, stitched in a cross-helical mill on a mandrel with a diameter of 280 mm in sleeves of size 450 × ext. 295 × 3080-3140 mm with a compression in diameter Δ from 2.2 up to 4.3 and a hood µ _p from 1.69 to 1.77. Then the sleeves were rolled on a pilgrim mill in a whip tube measuring 284 × 11 × 26100-26600 mm with a diameter compression of Δ = 36.2% and a hood µ _pr = 9.61 in accordance with claim 2. Technological waste (pilgrim heads and seed ends) was removed from the rolled pipes with a hot cutting saw. Pipe lashes with a hot cutting saw were cut into pipes of multiple lengths and residue. On the first multiple pipes from the seed side, the ends of the steel 10 pipes were 600-650 mm long, and on the third pipes (residues), the carbon ends 650-700 mm long were left. The first pipes and residues were set into the correct machine with steel 10 ends. The first multiple conversion pipes were cut on the machine side from steel 10 with a length of 5300 ± 50 mm and the remainder, the second were cut into two equal length pipes, bored and turned into cylindrical workpieces and profiled into hexagonal pipe blanks with a turnkey size of 252.6 ± 1.8 × 5.0 + 1.5 / -1.0 × 4300 + 80 / -30 mm.

Of these ingot billets, 22 hexagonal billets with a total weight of 3.190 tons were profiled and accepted as suitable. The average expenditure coefficient of the metal of steel 04X14T5R2F-Sh through the pipes of this batch amounted to 2.847. Data on rolling and delivery of conversion pipes 284 ± 11 mm in size from billets of height billets of electroslag remelting low-ductility steel 04Kh14T5R2F-Sh with boron content of 2.48-2.83% cast at ZMZ OJSC and rolled at TPU 8- 16 ″ with pilgrimage mills of ChTPZ OJSC according to the existing and proposed methods, production of turnkey hexagonal tube blanks from them 252.6 ± 1.8 × 5.0 + 1.5 / -1.0 × 4300 + 80 / -30 mm for compact storage and transportation of spent nuclear fuel are given in the table.

The table shows that the method according to the invention ensures the achievement of the technical result: the development of a new size of hexagonal tubes-billets of high quality in the manufacture of low-grade steel grade 04X14T5R2F-Sh with a boron content of from 2.0 to 3.0%.

Using the proposed method will allow to master the production of hexagonal billets with a turnkey size of 252.6 ± 1.8 × 5.0 + 1.5 / -1.0 × 4300 + 80 / -30 mm, reduce metal consumption, reduce weight hexagonal billet pipes, and therefore, reduce the weight of the racks while increasing their capacity and reliability.

Data on rolling and commissioning of conversion pipes 284 × 11 mm in size from billets of height billets of electroslag remelting low-ductility steel 04Kh14T5R2F-Sh with boron content of 2.48-2.83% cast at ZMZ OJSC and rolled at TPU 8- 16 ″ with pilgrimage mills of ChTPZ OJSC according to the existing and proposed methods, production of turnkey hexagonal tube blanks from them 252.6 ± 1.8 × 5.0 + 1.5 / -1.0 × 4300 + 80 / -30 mm for sealing storage and transportation of spent nuclear fuel are presented in table 1.

Claims (2)

1. Method for the production of conversion pipes 284 × 11 mm in size from solid ingots-blanks for the manufacture of turn-key hexagonal blanks 252.6 ± 1.8.0 × 5.0 + 1.5 / -1.0 × 4300 + 80 / -30 mm for compact storage and transportation of spent nuclear fuel, including casting by electroslag remelting of ingots of size 480 × 1800 ± 25 mm from low-plastic steel grade 04Х14Т5Р2Ф-Ш with boron content from 2.0 to 3.0%, with bottom and shrink parts made of steel of ductile carbon steel grades, the height of which is respectively from 0.04 to 0.05 and from 0.13 to 0.14 of the total cast ingots, forming seed ends and pilgrim heads during rolling of conversion pipes, turning of the outer surface of electroslag remelting ingots to remove casting defects to produce ingots-blanks of 465 ± 5 × 1800 ± 25 mm in size, in which a through central hole is drilled with a diameter of 100 ± 5 , 0 mm, they are heated to a temperature of 1030-1050 ° C, stitched in a cross-screw mill in sleeves of size 450 × ext. 295 × 3080-3140 mm with compression in diameter Δ from 2.2 to 4.3% and hoods μ _n from 1.69 to 1.77, the liner is rolled on Pilgrim ohm in steel making mill pipe-lash size 284 × 11 mm × 26100-26600 stretch μ _ave = 9.61 and swaging diameter Δ = 36,2%, of the pipe cutting saw hot cut process waste, leaving the ends of the plastic pipes of steel carbon grades 600-700 mm long, from the seed side and the pilgrim head, the whip pipe with a hot cutting saw is cut into multiple length pipes and the remainder, multiple pipes and the remainder are corrected on a six-roll machine using the rolling heating temperature, the first multiple pipe and the remainder being set into the right machine ends out plastic carbon grades of steel, the first multiple conversion pipe is cut on the machine from the side of carbon steel with a length of 5300 ± 50 mm and the remainder, the second is cut into two pipes of equal length, bored and turned into cylindrical workpieces of size 278.5 ± 1.8 × 5.0 + 1.5 / -1.0 mm for profiling into hexagonal workpieces of a given size. 2. The method according to claim 1, characterized in that the sleeves are rolled into a whip pipe 284 × 11 mm in size in a caliber of 290 mm on mandrels with a diameter of 264/265 mm, heated to a temperature of 500-550 ° C by rolling adjusting carbon sleeves, according to the technology: the mandrel is inserted into the sleeve, they run in the front carbon end with an increase in the feed of the sleeve into the deformation zone m from 0 to 18 mm, rolling the sleeve from steel 04X14T5R2F-Sh during the steady-state process is carried out with a feed of m = 12-14 mm, and rolling the rear carbon end and rolling in the pilgrim head is performed with the feed m = 18-20 mm.