CN102699102B - Production process method of small-caliber cold-drawing seamless steel tube used for boiler - Google Patents

Production process method of small-caliber cold-drawing seamless steel tube used for boiler Download PDF

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Publication number
CN102699102B
CN102699102B CN201210186160.0A CN201210186160A CN102699102B CN 102699102 B CN102699102 B CN 102699102B CN 201210186160 A CN201210186160 A CN 201210186160A CN 102699102 B CN102699102 B CN 102699102B
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China
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pipe
tube
cold
steel tube
steel
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CN201210186160.0A
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Chinese (zh)
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CN102699102A (en
Inventor
袁德智
朱新才
熊明祥
刘世文
冯波
敬大川
管朝晖
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重庆钢铁(集团)有限责任公司
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Abstract

The invention provides a production process method of a small-caliber cold-drawing seamless steel tube used for a boiler. The technological method including the steps of heating with an annular heater, punching by oblique rolling, tube-rolling by an automatic tube rolling mill, reducing a diameter by using a reducing mill through hot-rolling, cold-drawing and performing heat treatment is adopted. As high temperature of a steel tube is utilized to perform diameter reduction process on the steel tube, diameter reduction rate reaches to 25%, number of cycles of the cold-drawing of the steel tube is reduced, cold-drawing amount is respectively reduced by 30-70%, optimal production technology of the steel tube of a high-pressure boiler is created, energy consumption for steel tube production is reduced, and production efficiency is improved. According to the invention, a tube billet is obliquely placed in the annular heating furnace through a mechanical arm to lengthen the heating length, so that an overlong steel tube can be produced by using the lengthened tube billet. Under the condition of short-process production process the performance control method of the cold-drawing seamless steel tube is adopted by the boiler, the technologies such as small flow, multiple nozzles arranged at the side surfaces and the like are adopted by the heat treatment furnace; a computer fuzzy control technology is adopted by the heating furnace and the heat treatment furnace to control atmospheres inside the furnace; and the performances and organization of the produced cold-drawing boiler steel tubes are satisfied with standard requirements.

Description

The boiler manufacturing technique method of small-bore solid drawn tube

Technical field

The present invention relates to the manufacturing technique method of a kind of boiler with small-bore solid drawn tube, especially the process of low-cost production ultralong overweight steel pipe.

Background technology

In order to meet station boiler to overcritical, ultra supercritical demand for development, improve the process industrial art performance of boiler seamless steel pipe, the length that small-bore Boiler Used Coldly pulls out seamless steel pipe develops to more than 12m, the diameter of raw materials for production pipe and length increase, traditional processing technology method mainly comprises the steps: perforation, plug rolling, cold-drawn and heat treatment, because the length of fished pipe increases, causing pipe diameter to increase causes cold-drawn passage to increase, therefore the heating of pipe blank length of former firing equipment can not meet the demands, it is high also to there is energy consumption in cold-drawn processing, the defects such as the low and cost increase of efficiency.

When producing some and having a boiler small-caliber steel pipe of length requirement, due to the restriction of rolling equipment length, need to feed intake productions with larger pipe, and process through multi-pass cold-drawn, the length requirement of more than steel pipe 12m could be met.As the steel pipe of specification Φ 51 × 6 × 12000mm, need to use Φ 90mm, the pipe of length 2000mm feeds intake to produce and just can reach 12000mm length, cold-drawn 5 passages.Under normal circumstances, without special length requirement, use Φ 75mm, length 1500mm pipe feeds intake and produces just passable, only needs cold-drawn 3 passages.

Produce by larger materials in the tube, cold-drawn passage will be increased, need to increase the operations such as heat treatment, pickling, lubrication, consume the supplement production such as the energy and sulfuric acid material, increase the treating capacity of spent acid.In production in enormous quantities seamless steel tube for boiler production technology, the size of demand rolled steel tube and cold-drawn finished product is as far as possible close, reduces cold-drawn passage.The Main Means adopted is the size being reduced cold-drawn materials in the tube by hot-rolling method.General employing is produced close to the pipe of finished diameter, and due to mill length restriction, little pipe can not meet the requirement of product substance.Therefore, need to seek a kind of new process, to increase length and the substance of product, do not increase cold-drawn passage again, even can reduce cold-drawn passage, reduce the energy and supplies consumption.

Summary of the invention

For prior art above shortcomings, technical problem to be solved by this invention is the length and the substance that how to increase product, and reduce cold-drawn passage as far as possible, reach reduction production cost, and a kind of boiler manufacturing technique method of small-bore solid drawn tube is provided.

Solve the technical problem, the technical solution used in the present invention is: the boiler manufacturing technique method of small-bore solid drawn tube, is characterized in that, comprises following processing step:

Roll piercing: by heating of pipe blank to 1180-1220 DEG C, then pipe is delivered in Mannesmann piercer bores a hole;

Automatic tube rolling mill tube rolling: after perforation, steel pipe pulls out to automatic tube rolling mill carry out tube rolling by pulling out steel machine;

Reducing mill hot rolling tube reducing: after tube rolling, the temperature of steel is at 840 DEG C ~ 900 DEG C, pull out to mini-stretch reducing mill tube reducing by pulling out steel machine, sizing reduction controls 22% ~ 25%;

Cold-drawn: use chain cold-drawing machine cold-drawn, send to heat treatment after cold-drawn;

Heat treatment: temperature controlling range: 600 ~ 1050 DEG C, Control for Kiln Temperature precision ± 5 DEG C, the time is 20-120 minute.

Further, the concrete steps of present invention process method, comprising:

1) remove blemish with emery wheel reconditioning after pipe pickling, and be cut into the length of needs;

2) with rollgang, pipe is delivered to rotary heating furnace charging manipulator, manipulator is clamped pipe and is sent in stove, and being rotated into radial line is 35 ° of angles; After being heated to 1180-1220 DEG C, being changed into radial line by discharging machinery hand-screw is 35 ° of angles, and after clamping pipe, derotation 35 °, returns and pipe is placed rollgang, and pipe is delivered in Mannesmann piercer and carries out roll piercing;

3) pull out to automatic tube rolling mill carry out tube rolling by pulling out steel machine;

4) after tube rolling, the temperature of steel, at about 840-900 DEG C, is pulled out to mini-stretch reducing mill tube reducing by pulling out steel machine, sizing reduction 25%;

5), after treating steel pipe cooling, carry out pickling and lubricated with sulfuric acid, then use chain cold-drawing machine cold-drawn;

6) fished pipe send heat-treatment furnace to heat-treat, temperature controlling range: 600 ~ 1050 DEG C, Control for Kiln Temperature precision ± 5 DEG C, and the time is 20-120 minute.

7) reach the steel pipe of performance requirement after heat treatment, send to carry out aligning, Pipe Cutting finishing.

Compared to existing technology, short route of the present invention produces the boiler manufacturing technique method of small-bore solid drawn tube, has following beneficial effect:

1, hot-working roll piercing+automatic tube rolling mill tube rolling+reducing mill hot rolling tube reducing+cold-drawn+heat-treatment technology method is adopted, utilize the high temperature of steel pipe, the processing of hot rolling tube reducing is carried out to steel pipe, reducing rate reaches 25%, reduce the cycle-index of Tube Drawing, reduce cold-drawn amount 30 ~ 70% respectively, create the optimum production process of Hi-pressure Boiler Tube, reduce steel pipe's production energy resource consumption, improve production efficiency.

2, the present invention is in rotary heating furnace, is tiltedly put by pipe by manipulator, increases heated length, and the pipe after realization lengthens produces ultralong steel tube.

3, under productive technology of short flow condition, Boiler Used Coldly pulls out the Properties Control method of seamless steel pipe, heat-treatment furnace adopts low discharge, the technology such as many burners side arrangement, heating furnace and heat-treatment furnace computer fuzzy control technology control furnace atmosphere, and performance, the tissue of the cold-drawn seamless steel tube for boiler of production meet standard-required.

The especially applicable low-cost production length of the present invention and substance all have the steel pipe of requirement.

accompanying drawing explanation

Fig. 1 is the manufacturing technique method flow chart of the small-bore solid drawn tube of boiler of the present invention.

detailed description of the invention

Below in conjunction with specific embodiment, the present invention is described in further detail.

A boiler manufacturing technique method for small-bore solid drawn tube, concrete steps are:

Blemish is removed with emery wheel reconditioning after pipe pickling, pipe crane good for reconditioning is winched to the length that bar shears is cut into needs, with rollgang, pipe is delivered to rotary heating furnace charging manipulator, manipulator is clamped pipe and is sent in stove, being rotated into radial line is 35 ° of angles, place pipe, increase heated length.Heating of pipe blank is to after 1180-1220 DEG C, and being changed into radial line by discharging machinery hand-screw is 35 ° of angles, and after clamping pipe, derotation 35 °, returns and pipe is placed rollgang.Pipe is delivered in Mannesmann piercer and bores a hole.After perforation, steel pipe pulls out to automatic tube rolling mill carry out tube rolling by pulling out steel machine, after tube rolling, the temperature of steel is at about 850 DEG C, pulls out to mini-stretch reducing mill tube reducing, sizing reduction 25% by pulling out steel machine, steel pipe hydraulic heading machine after tube reducing is taken the lead, collect after taking the lead and stack, after treating steel pipe cooling, deliver to pickling tube, pickling is carried out with sulfuric acid, remove the iron scale of steel pipe, check steel tube surface situation, carry out removing with abrasive machine to defect.Pickling in pickling tube delivered to again by steel pipe after removal of defects, lubricated after pickling, and cold-drawn delivered to by the steel pipe after lubrication, uses chain cold-drawing machine cold-drawn, sends to heat treatment after cold-drawn.The steel pipe carrying out cold-drawn is again needed to carry out pickling lubrication again, arrive cold-drawn again, fished pipe send heat-treatment furnace to heat-treat, heat-treatment furnace adopts many burners, low discharge, side arrangement technology, temperature controls to adopt computer fuzzy control technology, temperature controlling range: 600 ~ 1050 DEG C, Control for Kiln Temperature precision ± 5 DEG C, the time is 20-120 minute.Heat treatment comprises normalized treatment 800 ~ 1050 DEG C, and the time is 20-25 minute; Temper 600 ~ 750 DEG C, the time is 1.5 ~ 2 hours.According to the difference of rolling shapes and wall thickness, select suitable heat treatment mode, as steel alloy needs normalized treatment to carry out temper again after aligning, then only normalized treatment is needed for low-carbon (LC) tubing.

Reach the steel pipe of performance requirement after heat treatment, finally send to carry out aligning, Pipe Cutting finishing.The laggard row desk checking of steel-tube finishing, nondestructive inspection, qualified steel pipe carries out packaging warehouse-in.

What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.

Claims (1)

1. the boiler manufacturing technique method of small-bore solid drawn tube, is characterized in that, comprises following processing step:
1) remove blemish with emery wheel reconditioning after pipe pickling, and be cut into the length of needs;
2) with rollgang, pipe is delivered to rotary heating furnace charging manipulator, manipulator is clamped pipe and is sent in stove, and being rotated into radial line is 35 ° of angles; After being heated to 1180 ~ 1220 DEG C, being changed into radial line by discharging machinery hand-screw is 35 ° of angles, and after clamping pipe, derotation 35 °, returns and pipe is placed rollgang, and pipe is delivered in Mannesmann piercer and carries out roll piercing;
3) pull out to automatic tube rolling mill carry out tube rolling by pulling out steel machine;
4) after tube rolling, the temperature of steel, at 840 DEG C about-900 DEG C, is pulled out to mini-stretch reducing mill tube reducing by pulling out steel machine, sizing reduction 25%; Steel pipe hydraulic heading machine after tube reducing is taken the lead, and collects and stack after taking the lead;
5), after treating steel pipe cooling, carry out pickling and lubricated with sulfuric acid, then use chain cold-drawing machine cold-drawn;
6) fished pipe send heat-treatment furnace to heat-treat, and heat-treatment furnace adopts many burners, low discharge, side arrangement technology, and described heat treatment comprises normalized treatment 800 ~ 1050 DEG C, and the time is 20-25 minute; Temper 600 ~ 750 DEG C, the time is 1.5 ~ 2 hours;
7) reach the steel pipe of performance requirement after heat treatment, send to carry out aligning, Pipe Cutting finishing.
CN201210186160.0A 2012-06-07 2012-06-07 Production process method of small-caliber cold-drawing seamless steel tube used for boiler CN102699102B (en)

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CN102921752A (en) * 2012-11-15 2013-02-13 河海大学常州校区 Hydraulic pressure cold-drawing production technique of metal pipe, and complete device of hydraulic pressure cold-drawing production technique
CN102962290B (en) * 2012-11-21 2016-06-15 浙江新纪元管业科技有限公司 Improve the production technology of solid drawn tube surface accuracy
CN102921763A (en) * 2012-12-05 2013-02-13 天津市大地工贸有限公司 Seamless steel tube processing technology
CN103272877A (en) * 2013-05-23 2013-09-04 苏州贝思特金属制品有限公司 Low-carbon inconel seamless tube
CN103921065B (en) * 2014-03-18 2016-06-15 泰州双羊精密无缝钢管有限公司 A kind of manufacture method of automobile specified seamless steel pipe
CN103921066B (en) * 2014-03-18 2017-01-11 江苏飞翔精密机械制造有限公司 Method for manufacturing seamless steel pipes for shock absorbers
CN104174688A (en) * 2014-07-21 2014-12-03 苏州贝思特金属制品有限公司 Production process of seamless stainless steel tube
CN104307876A (en) * 2014-10-20 2015-01-28 张家港市人和高精管有限公司 Production process of precise seamless steel tube for hydraulic cylinder
CN104907352B (en) * 2015-05-20 2017-01-04 湖州华特不锈钢管制造有限公司 A kind of stainless steel tube production method for condenser
CN104815845A (en) * 2015-05-28 2015-08-05 攀钢集团成都钢钒有限公司 Machining method of steel pipe
CN107685088A (en) * 2017-09-30 2018-02-13 徐州翔凯重工科技有限公司 A kind of preparation method of drawn tube

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CN101440428A (en) * 2008-12-19 2009-05-27 常州市新亚不锈钢管有限公司 Production method of seamless stainless steel tube for high-pressure boiler
CN101954377A (en) * 2010-09-13 2011-01-26 胡顺珍 Full-floating mandrel tandem-rolling seamless steel pipe production process
CN102319764A (en) * 2011-07-18 2012-01-18 新兴铸管股份有限公司 Method for manufacturing stainless steel seamless tube
CN102363256A (en) * 2011-06-16 2012-02-29 深圳市北科航飞生物医学工程有限公司 A method of processing cobalt-base alloy superfine thin-walled tubes for stents

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CN1113458A (en) * 1994-12-23 1995-12-20 宝山钢铁(集团)公司 Production process for hot-rolled boiler pipe of 12Cr2MoWVTiB steel alloy
CN101440428A (en) * 2008-12-19 2009-05-27 常州市新亚不锈钢管有限公司 Production method of seamless stainless steel tube for high-pressure boiler
CN101954377A (en) * 2010-09-13 2011-01-26 胡顺珍 Full-floating mandrel tandem-rolling seamless steel pipe production process
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