CN102720943A - Seamless steel pipe for long pipe trailer and manufacturing method for seamless steel pipe - Google Patents
Seamless steel pipe for long pipe trailer and manufacturing method for seamless steel pipe Download PDFInfo
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- CN102720943A CN102720943A CN2012102136844A CN201210213684A CN102720943A CN 102720943 A CN102720943 A CN 102720943A CN 2012102136844 A CN2012102136844 A CN 2012102136844A CN 201210213684 A CN201210213684 A CN 201210213684A CN 102720943 A CN102720943 A CN 102720943A
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Abstract
The invention discloses a seamless steel pipe for a long pipe trailer and a manufacturing method for the seamless steel pipe. The outer diameter of the seamless steel pipe is 630 to 720mm, the wall thickness is 18 to 30mm, and the length is 10,000 to 12,500mm. The manufacturing method comprises the following steps of: 1) rechecking a pipe blank, and turning a chuck; 2) performing shot blasting treatment on the pipe blank by using an outer shot blasting machine and an inner shot blasting machine respectively; 3) performing surface quality inspection, and polishing; 4) washing the pipe blank, and performing phosphate treatment; 5) saponifying the pipe blank for a first time; 6) performing cold drawing on the pipe blank for a first time; 7) polishing the inner and outer surfaces of a cold drawing pipe, and saponifying the cold drawing pipe for a second time; 8) performing cold drawing on the cold drawing pipe for a second time; and 9) performing dimensional inspection, alignment, defect polishing, surface quality inspection and non-destructive inspection on the cold drawing pipe respectively to form a finished seamless steel pipe, and cropping the top. The seamless steel pipe and the manufacturing method have the characteristics that the seamless steel pipe and the manufacturing method are economical, environment-friendly, low in metal consumption, high in quality and yield of finished products, efficient in processing, easy to operate, and the like, and completely meet the market requirement of seamless steel pipes for long pipe trailers.
Description
Technical field
The present invention relates to the seamless steel cylinder that long-tube trailer is used, specifically is the seamless steel pipe of making seamless steel cylinder, more specifically, is that a kind of long-tube trailer is used seamless steel pipe, and the production method of this seamless steel pipe.
Background technique
Long-tube trailer mainly is made up of semitrailer, framework, seamless steel cylinder, front end safety storehouse, operation storehouse, rear end five major parts, is the special car that stores, transports CNG, has advantages such as storage volume is big, conveying efficiency is high, delivery is convenient.Seamless steel cylinder maximum diameter commonly used on the market is φ 559mm, adorns 6 to 12 φ 559mm steel cylinders on the framework of every semitrailer usually, and the maximum volume of every steel cylinder is 2.7 M
3, like this, the CNG amount that every director manages the trailer storage is 16.2～32.4M
3In order further to improve conveying efficiency; Cut operating costs; The supply forwarding agent of CNG has proposed under the constant basically prerequisite of car body weight; Strengthen the CNG storage volume of long-tube trailer, and long-tube trailer stores the size of CNG amount by the seamless steel cylinder decision, the core component of decision seamless steel cylinder size then is a seamless steel pipe.
At present, mainly contain following two kinds of typical methods comparatively for the manufacturing of seamless steel pipe.Method one: automatic mill hot rolling → thermal expansion → car system chuck → pickling → phosphatization → saponification once → cold-drawn once → saponification secondary → cold-drawn secondary → alignment → reconditioning → size, surface quality testing → non-destructive inspection → performance test → spray mark.Method two: Pilger milling train or heat extruder processing → hollow forging inner and outer surface grinding → car system chuck → pickling → phosphatization → saponification once → cold-drawn once → saponification secondary → cold-drawn secondary → alignment → reconditioning → size, surface quality testing → non-destructive inspection → performance test → spray mark.
Wherein, the seamless steel pipe outer surface quality produced of method one is better.But behind thermal expansion, the same cross-sectional wall thickness ununiformity evenness of steel pipe can increase to more than 30%, and steel tube inner hole is pulled when making cold-drawn, even ruptures; The decarburized layers that pickling produces when mainly being the scale of removing waste tube-surface, grease, rusty stain, hot rolling etc., hollow forging are behind thermal expansion, and steel tube inner hole is residual to have graphite; Cause the pickling time long, sometimes even hydrogen embrittlement takes place, the endoporus pickling is unclean; Even more serious is that the graphite that steel pipe internal-surface adheres to makes pickling solution become pasty state very soon sometimes, thereby causes steel pipe to be scrapped; Product qualified rate is low, has also increased the difficulty and the cost of pickling solution environmental protection treatment.
The seamless steel pipe surface quality that method two is produced is poor, and the surface has the concavo-convex of leaf of bamboo shape, and is smooth inadequately bright and clean, and big with the cross section wall thickness difference.For eliminating the surface imperfection of seamless steel pipe, need to increase hollow forging inner and outer surface grinding process, the inner and outer surface grinding process has not only reduced manufacturing efficiency, and the metal loss more than 10% is arranged, and has caused waste of material.In addition, also relate to pickling processes, increased the difficulty and the cost of pickling solution environmental protection treatment.
Summary of the invention
One of the object of the invention is: the market demand to above-mentioned long-tube trailer provides a kind of large diameter long-tube trailer to use seamless steel pipe.
Two of the object of the invention is: to the deficiency of one of purpose and above-mentioned existing technology, provide a kind of and process efficient, end product quality and up-to-standard rate height, economic environmental protection, long-tube trailer that metal consumption is low is used method of manufacturing seamless steel pipe.
One of the object of the invention is realized through following technical proposals: a kind of long-tube trailer is used seamless steel pipe, and the external diameter of said seamless steel pipe is 630～720mm, and wall thickness is 18～30mm.
The length of said seamless steel pipe is 10000～12500mm.
Two of the object of the invention passes through following technical proposals to be realized: a kind of long-tube trailer comprises the following order step with the production method of seamless steel pipe:
1). the hollow forging of selecting is rechecked; To the hollow forging car system chuck after rechecking;
2). respectively the outer surface and the internal surface of hollow forging are thrown/shot blast with outer shot-blasting machine and interior compressed air shotblasting machine;
3). hollow forging is carried out surface quality testing; The defective that waste tube outer surface and internal surface exist is carried out reconditioning with manual mode respectively;
4). with clear water hollow forging is washed; After the flushing, with phosphatization liquid hollow forging is carried out phosphatization and handle, phosphatization temperature is 63～70 ℃, and phosphating time is 90～120min;
5). with saponification liquor hollow forging is carried out the saponification first time and handle, saponification temperature is 50～60 ℃, and saponification time is 12～20min;
6). adopt drawbench hollow forging to be carried out the cold-drawn first time, cold-drawn speed≤0.5m/min;
7). the inner and outer surface of reconditioning drawn tube; With saponification liquor drawn tube is carried out the saponification second time and handle, saponification temperature is 50～60 ℃, and saponification time is 12～20min;
8). adopt drawbench that the drawn tube of step 7) is carried out the cold-drawn second time, cold-drawn speed≤0.8m/min;
9). the drawn tube to step 8) carries out dimensional inspection, alignment, defective reconditioning, surface quality testing and non-destructive inspection respectively, forms the finished product seamless steel pipe; With finished product seamless steel pipe scale crop.
Step 2) bullet of China and foreign countries' shot-blasting machine is made up of by the proportional quantity of 5～7:3～5 shot and steel sand, and the diameter of these bullets is 1.0～1.4mm; Said outer shot-blasting machine is 0.8～1.2m/min to the Shot Blasting speed of waste tube outer surface.
Step 2) bullet of compressed air shotblasting machine is made up of by the proportional quantity of 7～9:1～3 shot and steel sand in, and the diameter of these bullets is 1.0～1.4mm; Compressed air shotblasting machine is 0.8～1.2m/min to the shot blast speed of waste pipe internal surface in said.
Surface quality testing in step 3) and the step 9) is that internal surface is adopted the endoscope check, and outer surface is checked with the range estimation mode.
General Acidity in Phosphating Solution in the step 4) is 35～45, and free acidity is 2～6.
The fatty acid of saponification liquor is 45～60g/L in step 5) and the step 7).
The diameter tolerance of the finished product seamless steel pipe in the step 9) is 0～15%, is 1.6～3.2um with cross section wall thickness difference≤2mm, total length straightness accuracy≤1 ‰, surface roughness for ± 2mm, circularity≤2mm, wall thickness tolerance.
Reconditioning in step 3), step 7) and the step 9) adopts pneumatic grinder to accomplish.
Non-destructive inspection in the step 9) is flaw detection of eddy current A level and the flaw detection of ultrasound L2 level.
The advantage of this seamless steel pipe is that diameter of steel tube is big, is 4.48 M with its single seamless steel cylinder (φ 720mm) maximum volume of making formation
3, compare existing φ 559mm steel cylinder, plot ratio has increased about 65.9%; If the separate unit long-tube trailer is adorned the seamless steel cylinder that 6 this seamless steel pipe assemblings form, car body weight is basic consistent with the long-tube trailer of adorning 8 φ 559mm steel cylinders, and the plot ratio that stores CNG then increases to more than 24.4%; Storage volume is big; Conveying efficiency is high, and operation cost is low, thereby this seamless steel pipe satisfies the market demand of long-tube trailer fully.
This production method has following major advantage:
1. adopt throwing/compressed air shotblasting machine that the hollow forging inner and outer surface is thrown/shot blast; The bullet that throwing/compressed air shotblasting machine is thrown ejection breaks up the rusty stain, scale, wing skin, cutting burr, decarburized layer of waste tube-surface etc., and with these impurity bands from waste tube-surface, make the hollow forging surfacing bright and clean; The flushing with clean water of postorder makes waste tube-surface further bright and clean; The hollow forging Roughness Surface on Control is 1.6～3.2um, and the stress of hollow forging is good, for follow-up cold-drawn operation provides good guarantee; Also eliminated simultaneously the disadvantage that traditional grinding, pickling bring, had that economic environmental protection, metal consumption are low, end product quality and characteristics such as up-to-standard rate is high, processing is efficient, easy to operate;
The wing skin on surface after the hollow forging throwing/shot blast, scab, defectives such as boss, pit, ring shape convex-concave are obvious; Be convenient to reconditioning; Internal surface is tested through endoscope, and check does not have and omits thoroughly, comprehensively; The hollow forging surface imperfection of checking out with manual mode carry out thoroughly, comprehensively reconditioning is eliminated, help follow-up cold-drawn processing and guarantee end product quality;
3. bullet diameter, the proportioning of throwing/compressed air shotblasting machine are carried out preferably, improve the quality of the mobile and throwing/shot blast of bullet, prevent to make the too high cold-drawn surface crack phenomenon that causes of hollow forging surface hardness because of throwing/shot blast.
Further specify beneficial effect of the present invention with test data below.
The seamless steel pipe main performance index contrast that seamless steel pipe that table one the present invention produces and existing production method (method one in the background technique) are produced
Can know through last table and to find out; Seamless steel pipe each item performance that the present invention produces obviously is superior to the seamless steel pipe that existing production method is produced; Satisfy the seamless steel cylinder application requirements of long-tube trailer fully, manufacture cost is also lower (to be mainly reflected in throwing/shot blast operation, only 160 yuan of throwing/shot blast operation per ton costs; And traditional grinding, pickling process per ton cost are up to 1500 yuan), on address aforesaid cost and be as the criterion with the price-levels in 2012 years.
Embodiment
Embodiment 1
The external diameter of this seamless steel pipe is 720mm, and wall thickness is 27mm, and length is 11000mm.
The production method of above-mentioned seamless steel pipe comprises the following order step:
1). selecting diameter is that 728mm, wall thickness are that 30mm, length are the hollow forging of 10540mm, and the hollow forging of selecting is rechecked; To the hollow forging car system chuck after rechecking;
2). adopt outer shot-blasting machine that the outer surface of hollow forging is carried out Shot Blasting, the bullet of outer shot-blasting machine is made up of by the proportional quantity of 6:4 shot and steel sand, and the diameter of these bullets is 1.2mm, and the speed of Shot Blasting is 1.2m/min; Compressed air shotblasting machine carries out shot blast to waste pipe internal surface in adopting, and the bullet of interior compressed air shotblasting machine is made up of by the proportional quantity of 8:2 shot and steel sand, and the diameter of these bullets is 1.2mm, and the speed of shot blast is 0.8m/min;
3). hollow forging is carried out surface quality testing, and wherein waste pipe internal surface adopts endoscope to carry out surface quality testing, and waste tube outer surface carries out quality inspection with the range estimation mode; The surface blemish that waste tube outer surface and internal surface exist (comprise the wing skin, scab, boss, pit, ring shape convex-concave etc.) employing pneumatic grinder carries out reconditioning one by one with manual mode;
4). the waste tube-surface to after the reconditioning washes with clear water; After the flushing, with phosphatization liquid the internal surface of hollow forging and outer surface are carried out phosphatization respectively and handle, the total acidity of phosphatization liquid is 40, and free acidity is 3, and phosphatization temperature is 68 ℃, and phosphating time is 119min;
5). the hollow forging of phosphatization being handled with saponification liquor carries out the saponification processing first time, and the fatty acid of saponification liquor is 50g/L, and saponification temperature is 55 ℃, and saponification time is 12min;
6). adopt the drawbench of 1250T that hollow forging is carried out the cold-drawn first time, cold-drawn speed is 0.5m/min, drawbench hydraulic system pressure 16MPa;
7). the drawn tube inner and outer surface that adopts pneumatic grinder that the cold-drawn first time is accomplished carries out reconditioning respectively, eliminates burr and scuffing plucking that cold-drawn forms; With saponification liquor drawn tube is carried out the saponification second time and handle, the fatty acid of saponification liquor is 50g/L, and saponification temperature is 60 ℃, and saponification time is 12min;
8). adopt the 1250T drawbench that the drawn tube of step 7) is carried out the cold-drawn second time, cold-drawn speed is 0.8m/min, and drawbench hydraulic system pressure is 14MPa;
9). the drawn tube to step 8) carries out dimensional inspection, alignment, defective reconditioning, surface quality testing and non-destructive inspection respectively; Wherein, reconditioning is to adopt pneumatic grinder to accomplish, and surface quality testing is to adopt endoscope to accomplish the inner surface quality check; Accomplish the outer surface quality check with the range estimation mode; Non-destructive inspection is flaw detection of eddy current A level and the flaw detection of ultrasound L2 level, simultaneously full Thickness Measurement by Microwave, and C-SCAN result is provided; Until forming the finished product seamless steel pipe, the diameter tolerance of this finished product seamless steel pipe should be 0～15%, should be 1.6～3.2um with cross section wall thickness difference≤2mm, total length straightness accuracy≤1 ‰, surface roughness for ± 2mm, circularity≤2mm, wall thickness tolerance; With finished product seamless steel pipe scale crop; The spray mark.
Embodiment 2
The external diameter of this seamless steel pipe is 660mm, and wall thickness is 19mm, and length is 12000mm.
The production method of above-mentioned seamless steel pipe comprises the following order step:
1). selecting diameter is that 660mm, wall thickness are that 22mm, length are the hollow forging of 11000mm, and the hollow forging of selecting is rechecked; To the hollow forging car system chuck after rechecking;
2). adopt outer shot-blasting machine that the outer surface of hollow forging is carried out Shot Blasting, the bullet of outer shot-blasting machine is made up of by the proportional quantity of 5:3 shot and steel sand, and the diameter of these bullets is 1.1mm, and the speed of Shot Blasting is 1.0m/min; Compressed air shotblasting machine carries out shot blast to waste pipe internal surface in adopting, and the bullet of interior compressed air shotblasting machine is made up of by the proportional quantity of 7:1 shot and steel sand, and the diameter of these bullets is 1.1mm, and the speed of shot blast is 0.8m/min;
3). hollow forging is carried out surface quality testing, and wherein waste pipe internal surface adopts endoscope to carry out surface quality testing, and waste tube outer surface carries out quality inspection with the range estimation mode; The surface blemish that waste tube outer surface and internal surface exist (comprise the wing skin, scab, boss, pit, ring shape convex-concave etc.) employing pneumatic grinder carries out reconditioning one by one with manual mode;
4). the waste tube-surface to after the reconditioning washes with clear water; After the flushing, with phosphatization liquid the internal surface of hollow forging and outer surface are carried out phosphatization respectively and handle, the total acidity of phosphatization liquid is 44, and free acidity is 6, and phosphatization temperature is 69 ℃, and phosphating time is 92min;
5). the hollow forging of phosphatization being handled with saponification liquor carries out the saponification processing first time, and the fatty acid of saponification liquor is 45g/L, and saponification temperature is 58 ℃, and saponification time is 15min;
6). adopt the drawbench of 1250T that hollow forging is carried out the cold-drawn first time, cold-drawn speed is 0.4m/min, drawbench hydraulic system pressure 15MPa;
7). the drawn tube inner and outer surface that adopts pneumatic grinder that the cold-drawn first time is accomplished carries out reconditioning respectively, eliminates burr and scuffing plucking that cold-drawn forms; With saponification liquor drawn tube is carried out the saponification second time and handle, the fatty acid of saponification liquor is 50g/L, and saponification temperature is 55 ℃, and saponification time is 18 min;
8). adopt the 1250T drawbench that the drawn tube of step 7) is carried out the cold-drawn second time, cold-drawn speed is 0.6m/min, drawbench hydraulic system pressure 12MPa;
9). the drawn tube to step 8) carries out dimensional inspection, alignment, defective reconditioning, surface quality testing and non-destructive inspection respectively; Wherein, reconditioning is to adopt pneumatic grinder to accomplish, and surface quality testing is to adopt endoscope to accomplish the inner surface quality check; Accomplish the outer surface quality check with the range estimation mode; Non-destructive inspection is flaw detection of eddy current A level and the flaw detection of ultrasound L2 level, simultaneously full Thickness Measurement by Microwave, and C-SCAN result is provided; Until forming the finished product seamless steel pipe, the diameter tolerance of this finished product seamless steel pipe should be 0～15%, should be 1.6～3.2um with cross section wall thickness difference≤2mm, total length straightness accuracy≤1 ‰, surface roughness for ± 2mm, circularity≤2mm, wall thickness tolerance; With finished product seamless steel pipe scale crop; The spray mark.
Embodiment 3
The external diameter of this seamless steel pipe is 630mm, and wall thickness is 21.5mm, and length is 12500mm.
The production method of above-mentioned seamless steel pipe comprises the following order step:
1). selecting diameter is that 630mm, wall thickness are that 25mm, length are the hollow forging of 11400mm, and the hollow forging of selecting is rechecked; To the hollow forging car system chuck after rechecking;
2). adopt outer shot-blasting machine that the outer surface of hollow forging is carried out Shot Blasting, the bullet of outer shot-blasting machine is made up of by the proportional quantity of 7:5 shot and steel sand, and the diameter of these bullets is 1.3mm, and the speed of Shot Blasting is 0.9m/min; Compressed air shotblasting machine carries out shot blast to waste pipe internal surface in adopting, and the bullet of interior compressed air shotblasting machine is made up of by the proportional quantity of 8:2 shot and steel sand, and the diameter of these bullets is 1.0mm, and the speed of shot blast is 1.1m/min;
3). hollow forging is carried out surface quality testing, and wherein waste pipe internal surface adopts endoscope to carry out surface quality testing, and waste tube outer surface carries out quality inspection with the range estimation mode; The surface blemish that waste tube outer surface and internal surface exist (comprise the wing skin, scab, boss, pit, ring shape convex-concave etc.) employing pneumatic grinder carries out reconditioning one by one with manual mode;
4). the waste tube-surface to after the reconditioning washes with clear water; After the flushing, with phosphatization liquid the internal surface of hollow forging and outer surface are carried out phosphatization respectively and handle, the total acidity of phosphatization liquid is 41, and free acidity is 5, and phosphatization temperature is 66 ℃, and phosphating time is 110min;
5). the hollow forging of phosphatization being handled with saponification liquor carries out the saponification processing first time, and the fatty acid of saponification liquor is 55g/L, and saponification temperature is 52 ℃, and saponification time is 19min;
6). adopt the drawbench of 1250T that hollow forging is carried out the cold-drawn first time, cold-drawn speed is 0.3m/min, drawbench hydraulic system pressure 17MPa;
7). the drawn tube inner and outer surface that adopts pneumatic grinder that the cold-drawn first time is accomplished carries out reconditioning respectively, eliminates burr and scuffing plucking that cold-drawn forms; With saponification liquor drawn tube is carried out the saponification second time and handle, the fatty acid of saponification liquor is 55g/L, and saponification temperature is 52 ℃, and saponification time is 17 min;
8). adopt the 1250T drawbench that the drawn tube of step 7) is carried out the cold-drawn second time, cold-drawn speed is 0.5m/min, drawbench hydraulic system pressure 13MPa;
9). the drawn tube to step 8) carries out dimensional inspection, alignment, defective reconditioning, surface quality testing and non-destructive inspection respectively; Wherein, reconditioning is to adopt pneumatic grinder to accomplish, and surface quality testing is to adopt endoscope to accomplish the inner surface quality check; Accomplish the outer surface quality check with the range estimation mode; Non-destructive inspection is flaw detection of eddy current A level and the flaw detection of ultrasound L2 level, simultaneously full Thickness Measurement by Microwave, and C-SCAN result is provided; Until forming the finished product seamless steel pipe, the diameter tolerance of this finished product seamless steel pipe should be 0～15%, should be 1.6～3.2um with cross section wall thickness difference≤2mm, total length straightness accuracy≤1 ‰, surface roughness for ± 2mm, circularity≤2mm, wall thickness tolerance; With finished product seamless steel pipe scale crop; The spray mark.
Embodiment 4
The external diameter of this seamless steel pipe is 711mm, and wall thickness is 26.5mm, and length is 12245mm.
The production method of above-mentioned seamless steel pipe comprises the following order step:
1). selecting diameter is that 711mm, wall thickness are that 30mm, length are the hollow forging of 11470mm, and the hollow forging of selecting is rechecked; To the hollow forging car system chuck after rechecking;
2). adopt outer shot-blasting machine that the outer surface of hollow forging is carried out Shot Blasting, the bullet of outer shot-blasting machine is made up of by the proportional quantity of 6:4 shot and steel sand, and the diameter of these bullets is 1.2mm, and the speed of Shot Blasting is 1.2m/min; Compressed air shotblasting machine carries out shot blast to waste pipe internal surface in adopting, and the bullet of interior compressed air shotblasting machine is made up of by the proportional quantity of 8:2 shot and steel sand, and the diameter of these bullets is 1.2mm, and the speed of shot blast is 0.8m/min;
3). hollow forging is carried out surface quality testing, and wherein waste pipe internal surface adopts endoscope to carry out surface quality testing, and waste tube outer surface carries out quality inspection with the range estimation mode; The surface blemish that waste tube outer surface and internal surface exist (comprise the wing skin, scab, boss, pit, ring shape convex-concave etc.) employing pneumatic grinder carries out reconditioning one by one with manual mode;
4). the waste tube-surface to after the reconditioning washes with clear water; After the flushing, with phosphatization liquid the internal surface of hollow forging and outer surface are carried out phosphatization respectively and handle, the total acidity of phosphatization liquid is 39, and free acidity is 4, and phosphatization temperature is 70 ℃, and phosphating time is 100min;
5). the hollow forging of phosphatization being handled with saponification liquor carries out the saponification processing first time, and the fatty acid of saponification liquor is 53g/L, and saponification temperature is 58 ℃, and saponification time is 20min;
6). adopt the drawbench of 1250T that hollow forging is carried out the cold-drawn first time, cold-drawn speed is 0.5m/min, drawbench hydraulic system pressure 16MPa;
7). the drawn tube inner and outer surface that adopts pneumatic grinder that the cold-drawn first time is accomplished carries out reconditioning respectively, eliminates burr and scuffing plucking that cold-drawn forms; With saponification liquor drawn tube is carried out the saponification second time and handle, the fatty acid of saponification liquor is 48g/L, and saponification temperature is 60 ℃, and saponification time is 15min;
8). adopt the 1250T drawbench that the drawn tube of step 7) is carried out the cold-drawn second time, cold-drawn speed is 0.8m/min, drawbench hydraulic system pressure 14MPa;
9). the drawn tube to step 8) carries out dimensional inspection, alignment, defective reconditioning, surface quality testing and non-destructive inspection respectively; Wherein, reconditioning is to adopt pneumatic grinder to accomplish, and surface quality testing is to adopt endoscope to accomplish the inner surface quality check; Accomplish the outer surface quality check with the range estimation mode; Non-destructive inspection is flaw detection of eddy current A level and the flaw detection of ultrasound L2 level, simultaneously full Thickness Measurement by Microwave, and C-SCAN result is provided; Until forming the finished product seamless steel pipe, the diameter tolerance of this finished product seamless steel pipe should be 0～15%, should be 1.6～3.2um with cross section wall thickness difference≤2mm, total length straightness accuracy≤1 ‰, surface roughness for ± 2mm, circularity≤2mm, wall thickness tolerance; With finished product seamless steel pipe scale crop; The spray mark.
The foregoing description is four comparatively typical concrete schemes of the present invention, only supplies to understand the present invention, can not be as limiting protection scope of the present invention.Seamless steel pipe material of the present invention is 4130X.Throwing/compressed air shotblasting machine in the production method of the present invention carries dust pelletizing system for automatic type steel pipe throwing/compressed air shotblasting machine; The shot material selection S390 that forms throwing/compressed air shotblasting machine bullet, steel sand material selection P18, the hardness of shot and steel sand is HRC40～45.
Claims (10)
1. a long-tube trailer is used seamless steel pipe, it is characterized in that: the external diameter of said seamless steel pipe is 630～720mm, and wall thickness is 18～30mm.
2. use seamless steel pipe according to the said long-tube trailer of claim 1, it is characterized in that: the length of said seamless steel pipe is 10000～12500mm.
3. a long-tube trailer comprises the following order step with the production method of seamless steel pipe:
1). the hollow forging of selecting is rechecked; To the hollow forging car system chuck after rechecking;
2). respectively the outer surface and the internal surface of hollow forging are thrown/shot blast with outer shot-blasting machine and interior compressed air shotblasting machine;
3). hollow forging is carried out surface quality testing; The defective that waste tube outer surface and internal surface exist is carried out reconditioning with manual mode respectively;
4). with clear water hollow forging is washed; After the flushing, with phosphatization liquid hollow forging is carried out phosphatization and handle, phosphatization temperature is 63～70 ℃, and phosphating time is 90～120min;
5). with saponification liquor hollow forging is carried out the saponification first time and handle, saponification temperature is 50～60 ℃, and saponification time is 12～20min;
6). adopt drawbench hollow forging to be carried out the cold-drawn first time, cold-drawn speed≤0.5m/min;
7). the inner and outer surface of reconditioning drawn tube; With saponification liquor drawn tube is carried out the saponification second time and handle, saponification temperature is 50～60 ℃, and saponification time is 12～20min;
8). adopt drawbench that the drawn tube of step 7) is carried out the cold-drawn second time, cold-drawn speed≤0.8m/min;
9). the drawn tube to step 8) carries out dimensional inspection, alignment, defective reconditioning, surface quality testing and non-destructive inspection, forms the finished product seamless steel pipe; With finished product seamless steel pipe scale crop.
4. according to the production method of the said long-tube trailer of claim 3, it is characterized in that: step 2 with seamless steel pipe) China and foreign countries shot-blasting machine bullet form by the proportional quantity of 5～7:3～5 by shot and steel sand, the diameter of these bullets is 1.0～1.4mm; Said outer shot-blasting machine is 0.8～1.2m/min to the Shot Blasting speed of waste tube outer surface.
5. according to the production method of the said long-tube trailer of claim 3, it is characterized in that: step 2 with seamless steel pipe) in the bullet of compressed air shotblasting machine form by the proportional quantity of 7～9:1～3 by shot and steel sand, the diameter of these bullets is 1.0～1.4mm; Compressed air shotblasting machine is 0.8～1.2m/min to the shot blast speed of waste pipe internal surface in said.
6. according to the production method of the said long-tube trailer of claim 3 with seamless steel pipe, it is characterized in that: the surface quality testing in step 3) and the step 9) is that internal surface is adopted the endoscope check, and outer surface is checked with the range estimation mode.
7. according to the production method of the said long-tube trailer of claim 3 with seamless steel pipe, it is characterized in that: the General Acidity in Phosphating Solution in the step 4) is 35～45, and free acidity is 2～6.
8. according to the production method of the said long-tube trailer of claim 3 with seamless steel pipe, it is characterized in that: the fatty acid of saponification liquor is 45～60g/L in step 5) and the step 7).
9. according to the production method of the said long-tube trailer of claim 3 with seamless steel pipe, it is characterized in that: the non-destructive inspection in the step 9) is flaw detection of eddy current A level and the flaw detection of ultrasound L2 level.
10. according to the production method of the said long-tube trailer of claim 3 with seamless steel pipe, it is characterized in that: the reconditioning in step 3), step 7) and the step 9) adopts pneumatic grinder to accomplish.
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| CN2012102136844A CN102720943A (en) | 2012-06-27 | 2012-06-27 | Seamless steel pipe for long pipe trailer and manufacturing method for seamless steel pipe |
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Cited By (8)
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| CN103302133A (en) * | 2013-06-27 | 2013-09-18 | 宜昌中南精密钢管有限公司 | Precise cold-drawing method of high-precision high-strength 30CrMnSi seamless steel tube |
| CN103316935A (en) * | 2013-06-27 | 2013-09-25 | 宜昌中南精密钢管有限公司 | Cold-drawing method of heavy-calibre gas cylinder pipe with diameter of more than 500mm |
| CN103341511A (en) * | 2013-06-27 | 2013-10-09 | 宜昌中南精密钢管有限公司 | Precise cold drawing method of seamless steel tube with high precision, high intensity and high tenacity |
| CN103878109A (en) * | 2012-12-24 | 2014-06-25 | 重庆市江津区通达机械厂 | Anticorrosive and rustproof treatment processing technology for seamless steel pipes |
| CN103921065A (en) * | 2014-03-18 | 2014-07-16 | 泰州双羊精密无缝钢管有限公司 | Manufacturing method of vehicle seamless steel tubes |
| CN109500131A (en) * | 2019-01-22 | 2019-03-22 | 德新钢管（中国）有限公司 | A kind of manufacturing method of long-tube trailer seamless steel pipe for gas cylinder |
| CN115464341A (en) * | 2022-09-23 | 2022-12-13 | 南京钢铁股份有限公司 | Method for machining free-cutting round steel with silvery bright surface |
| CN116984406A (en) * | 2023-08-21 | 2023-11-03 | 山东万通液压股份有限公司 | Cold drawing method of high-strength and high-precision E355 seamless steel tube for oil cylinder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103878109A (en) * | 2012-12-24 | 2014-06-25 | 重庆市江津区通达机械厂 | Anticorrosive and rustproof treatment processing technology for seamless steel pipes |
| CN103302133A (en) * | 2013-06-27 | 2013-09-18 | 宜昌中南精密钢管有限公司 | Precise cold-drawing method of high-precision high-strength 30CrMnSi seamless steel tube |
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| CN103341511A (en) * | 2013-06-27 | 2013-10-09 | 宜昌中南精密钢管有限公司 | Precise cold drawing method of seamless steel tube with high precision, high intensity and high tenacity |
| CN103316935B (en) * | 2013-06-27 | 2015-03-11 | 宜昌中南精密钢管有限公司 | Cold-drawing method of heavy-calibre gas cylinder pipe with diameter of more than 500mm |
| CN103302133B (en) * | 2013-06-27 | 2015-10-28 | 宜昌中南精密钢管有限公司 | The precise cold draw out method of a kind of high accuracy, high strength 30CrMnSi seamless steel pipe |
| CN103341511B (en) * | 2013-06-27 | 2015-12-23 | 宜昌中南精密钢管有限公司 | The precise cold draw out method of a kind of high accuracy, high strength, high tenacity seamless steel pipe |
| CN103921065A (en) * | 2014-03-18 | 2014-07-16 | 泰州双羊精密无缝钢管有限公司 | Manufacturing method of vehicle seamless steel tubes |
| CN109500131A (en) * | 2019-01-22 | 2019-03-22 | 德新钢管（中国）有限公司 | A kind of manufacturing method of long-tube trailer seamless steel pipe for gas cylinder |
| CN109500131B (en) * | 2019-01-22 | 2020-10-27 | 德新钢管（中国）有限公司 | Manufacturing method of seamless steel tube for gas cylinder of long tube trailer |
| CN115464341A (en) * | 2022-09-23 | 2022-12-13 | 南京钢铁股份有限公司 | Method for machining free-cutting round steel with silvery bright surface |
| CN116984406A (en) * | 2023-08-21 | 2023-11-03 | 山东万通液压股份有限公司 | Cold drawing method of high-strength and high-precision E355 seamless steel tube for oil cylinder |
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