CN102873512A - Manufacture method of large-caliber medium-and-thick-wall seamless steel tube for nuclear power plant - Google Patents
Manufacture method of large-caliber medium-and-thick-wall seamless steel tube for nuclear power plant Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 87
- 239000010959 steel Substances 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 49
- 238000010438 heat treatment Methods 0.000 claims abstract description 61
- 238000005096 rolling process Methods 0.000 claims abstract description 9
- 238000005554 pickling Methods 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 13
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 8
- 238000007689 inspection Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000005496 tempering Methods 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 5
- 238000000137 annealing Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims 2
- 230000001050 lubricating effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 description 13
- 238000009785 tube rolling Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000002950 deficient Effects 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000003818 cinder Substances 0.000 description 3
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- 229910052742 iron Inorganic materials 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
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- 238000003860 storage Methods 0.000 description 3
- 238000007514 turning Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 235000019647 acidic taste Nutrition 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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- 238000011010 flushing procedure Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
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Abstract
本发明提供了一种核电站用大口径中厚壁无缝钢管的制造方法。所述制造方法包括以下步骤：加热圆钢坯；使用斜轧穿孔机对圆钢坯进行穿孔，形成毛管；使用Φ508mm皮尔格周期轧管机组将毛管轧制成管坯，确保管坯的全长壁厚偏差控制在±8％，并且管坯的断面壁厚极差不超过其全长壁厚偏差的80％；加热管坯至1000～1100℃，然后使用拉拔式扩管机组对管坯进行扩径；对扩径后的管坯进行软化热处理；对扩径后的管坯的内、外表面进行整体修磨，修磨量控制为1.0～1.8mm；使用精密液压拔机对整体修磨后的管坯进行拔制，制得核电站用大口径中厚壁无缝钢管。本发明具有生产成本低、生产效率高、产品几何尺寸精度高、表面质量好等优点。The invention provides a method for manufacturing large-diameter and medium-thick-wall seamless steel pipes for nuclear power plants. The manufacturing method comprises the following steps: heating the round steel billet; piercing the round steel billet with a skew rolling piercer to form a capillary tube; rolling the capillary tube into a tube blank by using a Φ508mm Pilger cycle rolling mill to ensure the full-length wall thickness of the tube blank The deviation is controlled at ±8%, and the wall thickness of the section of the tube blank does not exceed 80% of the deviation of the full-length wall thickness; the tube blank is heated to 1000-1100°C, and then the tube blank is expanded by a drawing-type tube expansion unit. diameter; conduct softening heat treatment on the tube blank after diameter expansion; carry out overall grinding on the inner and outer surfaces of the tube blank after expansion, and the grinding amount is controlled at 1.0-1.8mm; The pipe blanks are drawn to produce large-caliber medium-thick-wall seamless steel pipes for nuclear power plants. The invention has the advantages of low production cost, high production efficiency, high precision of product geometric dimension, good surface quality and the like.
Description
Technical field
The present invention relates to heavy caliber seamless steel pipe manufacturing technology field, more particularly, relate to a kind of method of making thick-walled seamless steel pipes in the used in nuclear power station heavy caliber.
Background technology
In the prior art, thick-walled seamless steel pipes mainly contains following several production technology in the production heavy caliber:
The first, machined is pulled out in steel ingot roll piercing+interior boring outward; The second, the pilger mill unit that Φ 508mm is above; The third, the tube rolling unit is for base+integral body heating drawing type expander; The 4th kind, the tube rolling unit is for base+heat stepwise push mode hole enlargement.
Wherein, the first technique be a kind of employing steel ingot through roll piercing, again in boring pull out the production technology that machining is made steel pipe outward.The steel pipe geometric accuracy that this technique is made is high, and surface quality is good, but this technique has the deficiencies such as metal loss is large, lumber recovery is low, cost is high, efficient is low.
The second technique flexibly (for example has organization of production, can be mass, also can sporadicly produce) characteristics, but pilger mill mode roll bouncing value in the operation of rolling is large, easily cause wall thickness and outside diameter tolerance large (that is: the steel pipe geometric accuracy is relatively poor), the steel tube surface quality of producing simultaneously is relatively poor, can not satisfy the requirement of nuclear power pipe product high dimensional accuracy.
The third technique and the 4th kind of technique have the advantages that production technology is easy, cost is low, but the geometric accuracy of steel pipe and surfaces externally and internally quality level are all not as the second technique.
To sum up tell, need a kind of production technology that can produce in batch, on a large scale thick-walled seamless steel pipes in the used in nuclear power station high-precision heavy-caliber that meets the demands badly.
Summary of the invention
The object of the invention is to solve one or more in the prior art above shortcomings.
For example, one of purpose of the present invention is to provide a kind of and can has high lumber recovery and production cost is low, production efficiency the is high method for the manufacture of thick-walled seamless steel pipes in the used in nuclear power station high-precision heavy-caliber.
The invention provides the manufacture method of thick-walled seamless steel pipes in a kind of used in nuclear power station heavy caliber, described manufacture method may further comprise the steps: the heating round steel billet; Use Mannesmann piercing mill that round steel billet is bored a hole, form hollow billet; Use Φ 508mm Pilger pilger mill unit that hollow billet is rolled into pipe, guarantee that the total length wall thickness deviation of pipe is controlled at ± 8%, and the section wall thickness extreme difference of pipe is no more than 80% of its total length wall thickness deviation; Then heating pipe to 1000～1100 ℃ use the drawing type pipe expanding set that pipe is carried out hole enlargement; Pipe after the hole enlargement is softened heat treatment; Whole reconditioning is carried out on inside and outside surface to the pipe after the hole enlargement, and reconditioning quality is controlled to be 1.0～1.8mm; Use precise hydraulic to pull out the pipe of machine after to whole reconditioning and carry out draw, make thick-walled seamless steel pipes in the used in nuclear power station heavy caliber.
In one exemplary embodiment, the specification of described round steel billet can be Φ 600mm; The specification of thick-walled seamless steel pipes can be 559～610mm * 25～40mm according to external diameter * wall thickness in the described heavy caliber.
In one exemplary embodiment, described manufacture method also can be included in before the described draw step, and the pipe after the whole reconditioning of process is carried out the ultrasonic examination preliminary examination, and the qualified pipe of ultrasonic examination preliminary examination is carried out pickling, cleaning, phosphatization and lubricated.
In one exemplary embodiment, described manufacture method also can comprise the first aligning step and the second aligning step, wherein, described the first aligning step is arranged between described softening heat treatment step and the described whole reconditioning step, and described the second aligning step is arranged on after the draw step.
In one exemplary embodiment, the step of described heating round steel billet adopts rotary heating furnace with round steel billet homogeneous heating to 1230～1250 ℃.
In one exemplary embodiment, described hole enlargement step can adopt the mode of small deformation amount multi-pass, the mode of described small deformation amount multi-pass refers to every with after heating of pipe blank to 1000～1100 ℃, pipe is carried out 2 to 4 passage hole enlargements, and every time hole enlargement amount is controlled to be is not more than 20mm, guarantee that simultaneously the tolerance of the pipe after the hole enlargement satisfies external diameter ± 0.75%, wall thickness ± 10%.
In one exemplary embodiment, in described draw step, draw speed can be controlled at 0.5～2.5m/min, the system pressure of hydraulic draw machine is controlled at 8～12MPa, the wall thickness reducing amount during with draw is controlled to be 1.5～2.5mm and sizing reduction is controlled to be 4～7mm.
In one exemplary embodiment, in the situation that described pipe is high-alloy steel, described softening heat treatment step adopts full annealing technique; In the situation that described pipe be in, low-alloy steel, described softening heat treatment step adopts normalizing to add tempering process.
Compared with prior art, the present invention adopts and can realize thick-walled seamless steel pipes in the used in nuclear power station high-precision heavy-caliber is carried out low cost, makes expeditiously.In addition, manufacture method of the present invention also has the characteristics that lumber recovery is high, be fit to large big batch production.
The specific embodiment
Hereinafter, describe the manufacture method of thick-walled seamless steel pipes in the used in nuclear power station heavy caliber of the present invention in detail in connection with exemplary embodiment.
The manufacture method of thick-walled seamless steel pipes comprises step in the used in nuclear power station heavy caliber according to an illustrative embodiment of the invention: the heating round steel billet; Use Mannesmann piercing mill that round steel billet is bored a hole, form hollow billet; Use Φ 508mm Pilger pilger mill unit that hollow billet is rolled into pipe, guarantee that the total length wall thickness deviation of pipe is controlled at ± 8%, and the section wall thickness extreme difference of pipe is no more than 80% of its total length wall thickness deviation; Then heating pipe to 1000～1100 ℃ use the drawing type pipe expanding set that pipe is carried out hole enlargement; Pipe after the hole enlargement is softened heat treatment; Whole reconditioning is carried out on inside and outside surface to the pipe after the hole enlargement, and reconditioning quality is controlled to be 1.0～1.8mm; Use precise hydraulic to pull out the pipe of machine after to whole reconditioning and carry out draw, make thick-walled seamless steel pipes in the used in nuclear power station heavy caliber.
Preferably, in one exemplary embodiment of the present invention, the specification of described round steel billet is Φ 600mm; The specification of thick-walled seamless steel pipes is 559～610mm * 25～40mm according to external diameter * wall thickness in the described heavy caliber.
In the present invention, the ratio of the external diameter of thick-walled seamless steel pipes and wall thickness in the described heavy caliber (that is, external diameter/wall thickness is designated as D/S usually) can be 14 to 25.
Preferably, in one exemplary embodiment of the present invention, described manufacture method can also be included in before the described draw step, to carrying out the ultrasonic examination preliminary examination through the pipe after the whole reconditioning, to improve the lumber recovery of product; And the qualified pipe of ultrasonic examination preliminary examination carried out pickling, cleaning, phosphatization and lubricated.
Preferably, in one exemplary embodiment of the present invention, described manufacture method can also comprise the first aligning step and the second aligning step, wherein, described the first aligning step is arranged between described softening heat treatment step and the described whole reconditioning step, described the second aligning step is arranged on after the draw step, and the straight degree that the first aligning step and the second aligning step can be guaranteed product is set.
Preferably, in one exemplary embodiment of the present invention, the step of described heating round steel billet adopts rotary heating furnace with round steel billet homogeneous heating to 1230～1250 ℃.
Preferably, in one exemplary embodiment of the present invention, described hole enlargement step adopts the mode of small deformation amount multi-pass, the mode of described small deformation amount multi-pass refer to every with heating of pipe blank to 1000～1100 ℃ once after, pipe is carried out 2 to 4 passage hole enlargements, and every time hole enlargement amount is controlled to be is not more than 20mm, guarantee that simultaneously the tolerance of the pipe after the hole enlargement satisfies external diameter ± 0.75%, wall thickness ± 10%.
Preferably, in one exemplary embodiment of the present invention, in described draw step, draw speed is controlled at 0.5～2.5m/min, the system pressure of hydraulic draw machine is controlled at 8～12MPa, and the wall thickness reducing amount during with draw is controlled to be 1.5～2.5mm, and sizing reduction is controlled to be 4～7mm.
Preferably, in one exemplary embodiment of the present invention, described softening heat treatment step adopts normalizing to add the mode that tempering is processed, and wherein, normalizing temperature is 920 ± 10 ℃, and temperature is 690 ± 10 ℃.
Preferably, in one exemplary embodiment of the present invention, described whole reconditioning step is controlled to be 1.0～1.8mm with reconditioning quality.
In another exemplary embodiment, the manufacture method of thick-walled seamless steel pipes also can adopt following mode to realize in the used in nuclear power station heavy caliber of the present invention:
(1) total process flow can for: Φ 600mm round steel billet (for example, electroslag round ingot) → turning cinder hole → blank heating → Mannesmann piercing mill perforation → Φ 508mm Pilger pilger mill unit rolled pipe base → hot saw end to end → cool off → turn that → 1000 tons of the softening heat treatment → aligning of the 100 tons of pipe expanding set hole enlargement → pipes → whole reconditioning of surfaces externally and internally → pipe ultrasonic examination preliminary examination → pickling → cleanings → phosphatizations → lubricated pressure at accurate nights is pulled out machine draw → aligning → finishing → size and surface quality inspection → packing is put in storage.
(2) steel billet through LF concise+Fruit storage after, make via electroslag remelting again.The degree of eccentricity is answered≤5mm during the turning cinder hole.
(3) by rotary heating furnace with steel billet homogeneous heating to 1230～1250 ℃, preferably, be heated to 1235～1245 ℃.For example, when steel billet carries out concrete heating operation in annular furnace, annular furnace is not answered＜800 ℃ for the hot arc temperature, want empty 5～7 dischargings to put before and after the furnace charge, should guarantee that other charge-temperatures do not affect this billet heating temperature, the spacing that requires steel billet to arrange in stove is 800mm, homogeneous heating at a slow speed in should adopting, and guarantee equal thermal effect, heating must not occur because heating uneven male and female face, not saturating, overheated, the burn-off phenomenon of heating of producing, the heating steel billet time can be generally 11～13 hours greater than 11 hours, 1235～1245 ℃ of the steel temperature of coming out of the stove.
(4) Mannesmann piercing mill perforation step, need to make the hollow billet after the perforation visual straight as far as possible, total length external diameter in the same size, must adjust the airduct absolute altitude after the perforation and blow off inner surface oxidized iron sheet over against the hollow billet center, strengthen simultaneously inspection, the reinforcement mandrel lubrication of hollow billet inwall and internal strain instrument, to guarantee the steel pipe internal-surface quality.And should according to different production specifications, match corresponding perforating head size.For example, for Φ 600mm steel billet, capillary outer diameter is controlled at 640～650mm, guarantees hollow billet length≤4m.
(5) in the step of hot-rolled tube billet, use that Φ 508mm Pilger pilger mill unit is rolling to be rolled into pipe with hollow billet, guarantee that the total length wall thickness deviation of pipe is controlled at ± 8%, and the section wall thickness extreme difference of pipe is no more than 80% of its total length wall thickness deviation.Specifically, for the wall thickness extreme difference of guaranteeing hot-rolled tube billet is qualified, pulls out size for essence and reach product technology and require to create conditions, before the hot rolling tube rolling, the tool and moulds such as breaker roll, godet, top, plug check, press the intermediate value outfit tool and mould of tube blank size deviation; In the billet production process, should slow down the speed of taking the lead, control feed quantity well, the regrate coefficient is not less than 2.5, and the section of avoiding producing plane, rib, convex closure and wall thickness is poor overproof.Φ 508mm Pilger pilger mill unit rolled pipe base (for example, external diameter (OD) 510mm) should guarantee the total length wall thickness deviation be controlled at ± 8% in, section wall thickness extreme difference is no more than 80% of wall thickness deviation.
(6) for guaranteeing that essence is pulled out rear finished size and surface quality meets the demands, the geometrical dimension tolerances of pipe need satisfy D ± 0.75%, S ± 10% after heat expands.And the Pilger head end that can use rolling pipe during expander is as horn mouth, expands to blow the hole site according to rolling pipe after system is finished and carry out the horn mouth excision.Specifically, in actual production, control following aspect:
The first, the foreground material feeding length of drawing type pipe expander must be greater than 5.5m;
The second, must not occur expanding wrinkle during the hydraulic press bell mouth expanding, expand and split and expand askewly, otherwise answer again enlarging after the sawing.
The 3rd, the walking-beam furnace heating-up temperature is by 1000～1100 ℃ of controls, and can be 100min～150min heat time heating time, and should mark time and advance, and guarantees homogeneous heating, guarantees heating quality, and prevents male and female face etc. and add thermal defect;
The 4th, before the blank pipe is come out of the stove, should carry out the preparation of expansion machine.After the blank pipe is come out of the stove, go up as early as possible the expansion machine and expand system, reduce as far as possible the cooling amount because of blank pipe in the pilot process.
The 5th, adopt the heat of small deformation amount multi-pass to expand mode, the mode of described small deformation amount multi-pass refer to every with heating of pipe blank to 1000～1100 ℃ once after, pipe is carried out 2 to 4 passage hole enlargements, and every time hole enlargement amount is controlled to be is not more than 20mm, guarantee to expand thick pipe physical dimension and meet the demands.Expand when processed, the graphite lubrication that should strengthen coming directly towards is guaranteed the steel pipe internal-surface quality.
(7) after the hole enlargement step, pipe is softened heat treatment.Softening heat treatment step is for guaranteeing that follow-up draw step plays an important role smoothly.Specifically, be in the situation of high-alloy steel (for example, P91 etc.) at described pipe, described softening heat treatment step adopts full annealing technique; In described pipe is, in the situation of low-alloy steel (for example, WB36CN1 etc.), described softening heat treatment step adopts normalizing to add tempering process.Above-mentioned full annealing technique can for: with behind heating of pipe blank to 900～950 ℃, be incubated for first scheduled time, every millimeter of the wall thickness that described first scheduled time is pressed pipe calculated (namely in 6～8 minutes, be the pipe of x millimeter for wall thickness, its first scheduled time is 6x～8x minute, for example, x is 40, and then first scheduled time was 240～320 minutes); Then be chilled to 480～520 ℃, the air cooling of coming out of the stove at last with 30～35 ℃/hour speed stove.Above-mentioned normalizing add tempering process can for: with behind heating of pipe blank to 900～950 ℃, be incubated for second scheduled time, described second scheduled time is pressed every millimeter calculating (that is, be the pipe of x millimeter for wall thickness, its second scheduled time is 2x～3x minute) in 2～3 minutes of wall thickness of pipe; Then come out of the stove air cooling to room temperature, after advancing again stove and being warming up to 650～700 ℃, be incubated for the 3rd scheduled time, every millimeter of the wall thickness that described the 3rd scheduled time is pressed pipe calculated (namely in 6～8 minutes, be the pipe of x millimeter for wall thickness, its the 3rd scheduled time is 6x～8x minute), the air cooling of coming out of the stove at last.Adopt above-mentioned softening Technology for Heating Processing can: the yield strength of high-alloy steel (for example, P91 etc.) pipe is controlled to be is not more than 350MPa; Will in, the yield strength of low-alloy steel (for example, WB36, CN1 etc.) pipe is controlled to be and is not more than 450MPa.
(8) after processing through thermal expansion, because heating and to have formed thickness at steel pipe internal-surface thicker and adhere to closely oxide layer, and in the thermal expansion process, can embed inwall after oxide layer comes off, form pit not of uniform size, these all can have a strong impact on the carrying out that essence is pulled out operation, therefore, take the whole thinning technique of surfaces externally and internally, reconditioning quality control can be at 1.0～1.8mm, thereby can remove the defectives such as scuffing, pockmark of outer surface of tube blank oxide skin and inner surface.
(9) because essence is pulled out the cold deformation process defective of pipe there is enlarge-effect, even trickle defective also can cause the steel tube surface defective, therefore most important to the control of pipe surface quality, essence is pulled out front reply pipe and is carried out the ultrasonic examination preliminary examination by L2 equivalent among the GB/T5777, detects a flaw can carry out essence after qualified and pull out operation.
(10) precise hydraulic drawbench draw (being called for short essence pulls out)
Steel pipe is through after essence pulls out distortion, and dimensional accuracy improves, but essence is pulled out distortion and how many dimensional accuracies can be improved each time, then is difference to some extent with the difference of steel grade, steel pipe specification.The sprung back that essence is pulled out after the distortion can affect the steel pipe sizes precision, and when resistance of deformation was high, the sprung back is just large, and was also larger to the steel pipe sizes Accuracy.Finally determined smart withdrawing pattern tool size after considering the factors such as steel grade, specification and product size permissible variation of steel pipe, as follows:
Pipe specification: 565～616mm * 27～42mm (design wall thickness reducing amount 1.5～2.5mm, sizing reduction 4～7mm)
Draw external mold mould: 560～610mm
Draw internal mold mould: 480～560mm
Essence is pulled out thick trimmed size 559～610mm * 25～40mm, length 〉=5 meter
Here, before the draw step, tube blank size and surface are checked that next right back head carries out pickling, cleaning, phosphatization and lubricated successively.Concrete condition is as follows:
A, head processed
A system length: 350～400mm, a system external diameter: 556～606mm.
B, pickling: the sulfuric acid acid strength 10%～20%, Fe2+ concentration is not more than 50～70 ℃ of 250 grams per liters, temperature controlling range, determines pickling time according to acid strength, the actual detected value of Fe2+ concentration.Pickling time is controlled at 35～45 minutes, and the iron scale pickling of steel pipe surfaces externally and internally is clean.
C, flushing: the steel pipe after the pickling will repeatedly be full of water and topple in Rinsing Area, till the iron scale and attachment of outwelling the pipe internal memory.And then topple over and be placed on the scouring table, wash by root from top to bottom with water under high pressure, until flow out till the clear water in the pipe.
D, phosphatization: 30～40 of total acidities, 1～4 of free acidity, Zn (NO3) 2 are that 18～28 grams per liters, H3PO4 are 4～7 grams per liters, SO42-≤2 grams per liters, 60～70 ℃ of temperature, phosphating time 15～20 minutes.
E, lubricated: lubricant concentration is 1.2～2.6BN, free alkalinity 0～1.5Pt, 50～65 ℃ of temperature, saponification time 10～15 minutes.
F, 1000 precise hydraulics pull out mechanism
1. draw center line and drawn-car center are consistent to keep both;
2. to overlap end face vertical for compacting, locating hole and die holder to determine to be in place external mold;
3. internal mold and core bar, screw assembling should be interference fits, to prevent floating in transition loose damage mould and the draw;
4. draw speed is controlled at 0.5～2.5m/min, and system pressure is controlled at 8～12MPa.The draw initial stage is adopted low speed draw speed, adjusts draw speed according to system pressure after the draw even running.
The method of this exemplary embodiment has the advantages that production technology is simple, lumber recovery is high, cost is low, production efficiency is high, and the geometric accuracy of its product is high, the surfaces externally and internally quality is good.In addition, its product can satisfy the following requirement of thick-walled seamless steel pipes in the used in nuclear power station heavy caliber:
(1) outer diameter of steel pipes 559～610mm; (2) thickness of steel pipe 25～40mm; (3) steel pipe length 〉=5m; (4) steel pipe satisfies the ultrasonic examination acceptance requirement of L2 equivalent in the GB/T5777-2008 standard; (5) steel pipe satisfies magnetic powder inspection II level acceptance requirement in the JB/T4730.4-2005 standard; (6) surface roughness Ra of steel pipe≤6.3; (7) dimensional tolerance of steel pipe: wall thickness ± 5%, external diameter (+3.2mm ,-0.8mm).
Describe exemplary embodiment of the present invention in detail below in conjunction with concrete example.
In this example, thick-walled seamless steel pipes product technology in the used in nuclear power station heavy caliber is required to see Table 1.
The product requirement of table 1 the present embodiment
In this example, the production technology of employing is: Φ 600mm electroslag round ingot → turning cinder hole → blank heating → Mannesmann piercing mill perforation → Φ 508mm Pilger pilger mill unit rolled pipe base → hot saw end to end → cool off → turn to press the whole reconditioning → ultrasonic examination of 100 tons of pipe expanding set hole enlargements → (pipe softens heat treatment) → aligning → surfaces externally and internally → pickling → cleanings → phosphatization → lubricated → 1000 tons of accurate nights and pull out machine draw → aligning → finishing → size and surface quality inspection → packing is put in storage.
Table 2 shows blank heating relevant parameter situation.
Table 2 blank heating relevant parameter
Table 3 shows the relevant parameter of roll piercing operation.
Table 3 roll piercing working procedure parameter
Table 4 shows the relevant parameter when adopting Φ 508mm Pilger pilger mill unit to carry out tube rolling.
Table 4 Φ 508mm Pilger pilger mill unit pass and size Control
Table 5 shows the relevant parameter in the expander operation.
Relevant parameter in the table 5 expander operation
For softening heat treatment, adopt normalizing to add the Technology for Heating Processing of tempering, guarantee its yield strength between 400MPa～450MPa, satisfy essence fully and pull out requirement.Specifically, first with behind heating of pipe blank to 920 ± 10 ℃, insulation 100min; Then come out of the stove air cooling to room temperature, advance again stove and be warming up to 690 ± 10 ℃, insulation 240min.
In this example, in the whole reconditioning step of surfaces externally and internally, the outer surface reconditioning quality is controlled to be≤1.0mm, and the inner surface reconditioning quality is controlled to be≤0.5mm, with defectives such as the scuffing of removing external defects, inner surface and pockmarks, totally is as the criterion with the defective reconditioning in principle.
In this example, the equipment of ultrasonic examination preliminary examination and relevant parameter are as follows:
Equipment: U.S. Φ 720mmDAPCO fully-automatic supersonic defectoscope
Frequency probe: 4MHz
The check position: surfaces externally and internally 100% all standing, manual defect detecting test is adopted in the broken end blind area
Inspection party to: in length and breadth to
Acceptance criteria: GB/T5777-2008L2 level
Table 6 shows the relevant parameter control situation of pickling process.
The relevant parameter of table 6 pickling process
Table 7 shows the relevant parameter control situation of phosphatization operation.
The relevant parameter of table 7 phosphatization operation
Table 8 shows the relevant parameter control situation of lubricated operation.
The relevant parameter of the lubricated operation of table 8
Table 9 shows the related process parameter when adopting precise hydraulic draw machine to carry out draw.
The relevant parameter of table 9 precise hydraulic draw machine draw operation
The below show to adopt that said method obtains 3 with the relevant parameter situation of sample pipe after tube rolling operation, hole enlargement operation and draw operation, and described 3 mechanical properties values with the fished pipe of sample pipe.
Table 10 shows the physical dimension of the pipe that the tube rolling operation obtains.
The physical dimension of the pipe that table 10 tube rolling operation obtains
Table 11 shows the physical dimension of the pipe that the hole enlargement operation obtains.
The physical dimension of the pipe that table 11 hole enlargement operation obtains
Table 12 shows the physical dimension of the fished pipe that the draw operation obtains.
Table 13 shows mechanical property (vertically) situation of fished pipe.
The physical dimension of the fished pipe that table 12 draw operation obtains
The room temperature tensile performance of table 13 fished pipe
Table 14 shows the impact property situation of fished pipe.
Table 15 shows the high-temperature short delay stretching performance situation of fished pipe.
Table 16 shows the situation that the relevant parameter with the steel pipe of this example and three kinds of production technology gained steel pipes of the prior art compares.
The impact property of table 14 fished pipe
The high-temperature short delay stretching performance of table 15 fished pipe
The comparable situation of the relevant parameter of the steel pipe of table 16 steel pipe of the present invention and prior art
In sum, the present invention can be with round ingot (for example, specification is Φ 600mm) be rolled into pipe via Φ 508mm Pilger pilger mill unit, carry out hole enlargement via integral body heating drawing type pipe expanding set again, carry out draw finally by pulling out machine by 1000 tons of precise hydraulics, make thick-walled seamless steel pipes in the used in nuclear power station heavy caliber, and the present invention has advantages such as production cost is low, production efficiency is high, the product geometric accuracy is high, surface quality is good.
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