CN103521548B - The preparation method of a kind of martensite steel pipe - Google Patents
The preparation method of a kind of martensite steel pipe Download PDFInfo
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- CN103521548B CN103521548B CN201310508189.0A CN201310508189A CN103521548B CN 103521548 B CN103521548 B CN 103521548B CN 201310508189 A CN201310508189 A CN 201310508189A CN 103521548 B CN103521548 B CN 103521548B
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Abstract
The present invention discloses the preparation method of a kind of martensite steel pipe, comprises the following steps: 1) martensite steel pipe base hits central hole, then bores a hole; Described piercing temperature is 1000-1200 DEG C; 2) the pipe base after perforation is carried out anneal; 3) the pipe base pickle solution after annealing is carried out pickling, then carry out phosphatization, saponification and swabbing successively; 4) the pipe base after swabbing is carried out cold rolling, obtain martensite steel pipe finished product; Described step 2) annealing process comprise the following steps successively: stove put into by a. steel pipe base, and temperature rises to 750-760 DEG C, insulation 0.5-1.5h; B. in-furnace temperature is risen to 770-820 DEG C, process 3-4h; C. in-furnace temperature is down to 710-730 DEG C, insulation 1.5-2.5h; D. in-furnace temperature is down to 650-700 DEG C, insulation 1.5-2.5h; E. pipe base is come out of the stove, and is cooled to room temperature. This preparation method is reliably simple and easy, and in making, martensite steel pipe does not ftracture, and reduces the learies of pipe base; Obtained martensite tube quality is good, and intensity is low, and toughness is good, is suitable for further processing.
Description
Technical field
The present invention relates to the preparation field of steel pipe, particularly relate to the preparation method of a kind of martensite steel pipe.
Background technology
Martensite Stainless Steel has good mechanical property and high-temperature oxidation resistance and erosion resistance, so range of application is very wide, but the preparation difficulty of martensite steel pipe is big, the martensite tube quality obtained is poor, not durable, the Chinese patent that the patent No. is CN102699103 discloses the preparation method of a kind of 20CrMo steel pipe on October 3rd, 2012, processing step is brief, it is of value to save energy consumption, but in production process, often there will be steel pipe internal-surface or outside surface longitudinal cracking, once cracking just cannot carry out follow-up processing, cause the waste of steel, and obtained martensite steel pipe, hardness is very big, toughness is little, it is difficult to again process.
Summary of the invention
In order to overcome the deficiencies in the prior art, the present invention provides the preparation method of a kind of martensite steel pipe, and its preparation method can solve the production problem of martensite steel pipe's production, production cost is low, and the martensite tube quality obtained is good, and hardness is low, toughness height, is applicable to it is for further processing.
In order to reach described goal of the invention, the present invention adopts following technical scheme: the preparation method of a kind of martensite steel pipe, it is characterised in that: comprise the following steps: 1) martensite steel pipe base hits central hole, then bores a hole;Described piercing temperature is 1000-1200 DEG C; 2) the pipe base after perforation is carried out anneal; 3) the pipe base pickle solution after annealing is carried out pickling, then carry out phosphatization, saponification and swabbing successively; 4) the pipe base after swabbing is carried out cold rolling, obtain martensite steel pipe finished product; Described step 2) annealing process comprise the following steps successively: stove put into by a. steel pipe base, and temperature rises to 750-760 DEG C, insulation 0.5-1.5h; B. in-furnace temperature is risen to 770-820 DEG C, process 3-4h; C. in-furnace temperature is down to 710-730 DEG C, insulation 1.5-2.5h; D. in-furnace temperature is down to 650-700 DEG C, insulation 1.5-2.5h; E. pipe base is come out of the stove, and is cooled to room temperature.
As preferably, the aperture of described centre hole is more than 15mm, the degree of depth is 10-25mm.
The centre hole of this kind of specification, adaptive with the top of perforation, not easily wear partially, it is to increase piercing efficiency.
As preferably, in annealing process, method of cooling described in step e is Slow cooling in asbestos insulation can.
After coming out of the stove, naturally cooling can cause steel pipe to ftracture, and adopts asbestos insulation can Slow cooling that steel tube surface can be avoided to ftracture.
As preferably, the pickling temperature in described step 3) is 50-60 DEG C, pickling time is 30-50min.
Suitable pickling temperature can improve pickling effect, and pickling time crosses length can cause steel pipe overpickling, the pipe base surface of overpickling slightly hot-tempered, look dark, has circular pin hole time serious, easily glues roller or fragmentation time cold rolling; The insufficient words of pickling can not remove rust, the oxide skin on pipe base surface completely, and the steel pipe finished product resistance to corrosion obtained is poor.
As preferably, the phosphatization temperature in described step 3) is 55-65 DEG C, phosphating time is 15-25min.
Form phosphatize phosphate coat in steel tube surface after bonderizing, play good anticorrosion ability, process 15-25min at 55-65 DEG C and can form 7-10g/m2Phosphatize phosphate coat, existing good preservative effect, can save again high temperature consume energy and phosphatization liquid.
As preferably, described pickle solution is the mixed solution of dilute sulphuric acid and sodium chloride solution.
As preferably, in described pickle solution, the whole volumetric molar concentration of dilute sulphuric acid is 15-20%, described sodium chloride solution final concentration is 4-6%.
The dilute sulphuric acid that the present invention adopts and sodium chloride solution mix as pickle solution, and pickling effect is good, and in conjunction with bonderizing of the present invention, made steel pipe is in cold-rolled process, and cracking rate obviously reduces, and non-corrosibility is better.
As preferably, the pipe base after annealing also being carried out aligning 3-4 time before pickling by described step 3).
The object of aligning is to make the oxide skin of outer surface of tube blank pitch, be convenient to pickling.
As preferably, finished product step 4) obtained carries out ageing treatment in a vacuum furnace.
By implementing above-mentioned technical scheme, it is an advantage of the invention that:
(1) adopting perforation, annealing, pickling, cold rolling flow process to prepare martensite steel pipe, this preparation method is reliably simple and easy, by optimizing annealing process, in making, martensite steel pipe does not ftracture, and obtained martensite tube quality is good, and intensity is low, toughness is good, is suitable for further processing;
(2) piercing temperature is related to the degree of cracking of percentage of perforation and steel pipe, and applicable piercing temperature can ensure piercing efficiency, avoids steel pipe to ftracture, moreover it is possible to avoid the generation of waste product. First by the top preheating of perforation before perforation, perforation effect is better;
(3) annealing process of each processing step parameter of the present invention especially the present invention, steel pipe internal-surface can be overcome or defect that outside surface easily ftractures, this may be owing to steel pipe base first being put into stove 750-760 DEG C of insulation, ensure that steel pipe is consistent with in-furnace temperature, then carry out interim anneal and cooling, make pipe base stable performance.
Embodiment
Below in conjunction with specific embodiment, the present invention is described further.
Embodiment 1:
A preparation method for martensite steel pipe, comprises the following steps: 1) martensite steel pipe base punching footpath is 15mm, and the degree of depth is the centre hole of 10mm, then punching top is preheated to 800 DEG C, bores a hole when temperature is 1000 DEG C; 2) carry out anneal by the pipe base introducing annealing furnace after perforation, comprise the following steps: a. pipe base is introduced in annealing furnace, and temperature rises to 750 DEG C, insulation 1.5h; B. in-furnace temperature is risen to 820 DEG C, process 3h; C. in-furnace temperature is down to naturally 730 DEG C, insulation 2.5h; D. in-furnace temperature is down to naturally 700 DEG C, insulation 1.5h; E. pipe base is come out of the stove, and introduces in asbestos insulation can and slowly cools to room temperature; 3) the pipe base after annealing is carried out aligning 3 times, then with whole volumetric molar concentration be 20% dilute sulphuric acid and final concentration be 5% the pickle solution of sodium chloride solution composition be 60 DEG C of pickling 30min in temperature, afterwards with the steel pipe after high pressure water washing pickling, then bonderizing 25min is carried out, treatment temp is 55 DEG C, process and with water, steel tube surface phosphatization liquid is rinsed well, then carry out saponification process, use glass powder swabbing afterwards; 4) pipe base is carried out cold rolling, obtain martensite steel pipe finished product.
Embodiment 2:
A preparation method for martensite steel pipe, comprises the following steps: 1) martensite steel pipe base punching footpath is 20mm, and the degree of depth is the centre hole of 25mm, then punching top is preheated to 1000 DEG C, bores a hole when temperature is 1200 DEG C; 2) carry out anneal by the pipe base introducing annealing furnace after perforation, comprise the following steps: a. pipe base is introduced in annealing furnace, and temperature rises to 760 DEG C, insulation 0.5h; B. in-furnace temperature is risen to 770 DEG C, process 4h; C. in-furnace temperature is down to naturally 710 DEG C, insulation 2h; D. in-furnace temperature is down to naturally 650 DEG C, insulation 2.5h; E. pipe base is come out of the stove, and introduces in asbestos insulation can and slowly cools to room temperature; 3) the pipe base after annealing is carried out aligning 4 times, then with whole volumetric molar concentration be 15% dilute sulphuric acid and final concentration be 4% the pickle solution of sodium chloride solution composition be 50 DEG C of pickling 50min in temperature, afterwards with the steel pipe after high pressure water washing pickling, then bonderizing 15min is carried out, treatment temp is 65 DEG C, process and with water, steel tube surface phosphatization liquid is rinsed well, then carry out saponification process, use glass powder swabbing afterwards; 4) pipe base is carried out cold rolling, obtain martensite steel pipe finished product.
Embodiment 3:
A preparation method for martensite steel pipe, comprises the following steps: 1) martensite steel pipe base punching footpath is 18mm, and the degree of depth is the centre hole of 20mm, then punching top is preheated to 900 DEG C, bores a hole when temperature is 1100 DEG C; 2) carry out anneal by the pipe base introducing annealing furnace after perforation, comprise the following steps: a. pipe base is introduced in annealing furnace, and temperature rises to 750 DEG C, insulation 1h; B. in-furnace temperature is risen to 800 DEG C, process 3.5h; C. in-furnace temperature is down to naturally 720 DEG C, insulation 1.5h; D. in-furnace temperature is down to naturally 680 DEG C, insulation 2h; E. pipe base is come out of the stove, and introduces in asbestos insulation can and slowly cools to room temperature; 3) the pipe base after annealing is carried out aligning 4 times, then with whole volumetric molar concentration be 18% dilute sulphuric acid and final concentration be 4% the pickle solution of sodium chloride solution composition be 55 DEG C of pickling 40min in temperature, afterwards with the steel pipe after high pressure water washing pickling, then bonderizing 20min is carried out, treatment temp is 60 DEG C, process and with water, steel tube surface phosphatization liquid is rinsed well, then carry out saponification process, use glass powder swabbing afterwards;4) pipe base is carried out cold rolling, obtain martensite steel pipe finished product; 5) carrying out ageing treatment by martensite steel pipe finished product input vacuum oven, vacuum tightness is 10-4Pa��
Embodiment 4:
With the difference of embodiment 1 it is: described pickle solution formula is HF5-8%, HNO310-15%, all the other are water. Described pickling time is 10mim.
Embodiment 5:
With the difference of embodiment 1 being: described bonderizing 10min, treatment temp is 50 DEG C.
Embodiment 6:
With the difference of embodiment 1 it is: described pickle solution formula is HF5-8%, HNO310-15%, all the other are water. Described pickling time is 10mim. Described bonderizing 10min, treatment temp is 50 DEG C.
Comparative example 1:
An existing preparation method for martensite steel pipe, comprises the following steps: 1) martensite steel pipe base hits central hole, bores a hole when temperature is 1000 DEG C; 2) the pipe base after perforation is introduced in annealing furnace, at 800 DEG C of temperature, carry out anneal; 3) to the whole volumetric molar concentration of the pipe base after annealing be 15% dilute sulphuric acid and final concentration be 3% the pickle solution that forms of sodium chloride solution carry out pickling, afterwards with the steel pipe after water flushing pickling, then bonderizing 15min is carried out, treatment temp is 50 DEG C, process and with high pressure water, steel tube surface phosphatization liquid is rinsed well, then carry out saponification process, use glass powder swabbing afterwards; 4) pipe base is carried out cold rolling, obtain martensite steel pipe finished product.
Comparative example 2:
An existing preparation method for martensite steel pipe, comprises the following steps: 1) martensite steel pipe base hits central hole, bores a hole when temperature is 1100 DEG C; 2) the pipe base after perforation is introduced in annealing furnace, at 780 DEG C of temperature, carry out anneal; 3) to the whole volumetric molar concentration of the pipe base after annealing be 13% dilute sulphuric acid and final concentration be 2% the pickle solution that forms of sodium chloride solution carry out pickling, afterwards with the steel pipe after high pressure water washing pickling, then bonderizing 10min is carried out, treatment temp is 50 DEG C, process and with water, steel tube surface phosphatization liquid is rinsed well, then carry out saponification process, use glass powder swabbing afterwards; 4) pipe base is carried out cold rolling, obtain martensite steel pipe finished product.
Hardness (HRC) and the fracture toughness property (K of the martensite steel pipe finished product that embodiment 1-3 and comparative example obtain being of a size of 50*7.5 is sent out by static pressureIC) and 1000 steel pipe finished products in cracking radical detect, detected result is in table 1:
Table 1: the detected result of the martensite steel pipe finished product that different process obtains:
By HRC and KICResult is it will be seen that the martensite steel pipe that martensite steel pipe hardness that the present invention obtains obtains than prior art significantly reduces, and toughness is good, is suitable for further processing; By cracking number: adopting the pickle solution formula in the present invention and pickling temperature and time in conjunction with parkerized time and temperature, the cracking rate obtaining steel pipe significantly reduces.
Claims (7)
1. the preparation method of a martensite steel pipe, it is characterised in that: comprise the following steps: 1) martensite steel pipe base hits central hole, then bores a hole; Described piercing temperature is 1000-1200 DEG C; 2) the martensite steel pipe base after perforation is carried out anneal; 3) the martensite steel pipe base pickle solution after annealing is carried out pickling, then carry out phosphatization, saponification and swabbing successively; 4) the martensite steel pipe base after swabbing is carried out cold rolling, obtain martensite steel pipe finished product;Described step 2) annealing process comprise the following steps: stove put into by a. steel pipe, and temperature rises to 750-760 DEG C, insulation 0.5-1.5h; B. in-furnace temperature is risen to 770-820 DEG C, process 3-4h; C. in-furnace temperature is down to 710-730 DEG C, insulation 1.5-2.5h; D. in-furnace temperature is down to 650-700 DEG C, insulation 1.5-2.5h; E. martensite steel pipe base is come out of the stove, and is cooled to room temperature; Phosphatization temperature in described step 3) is 55-65 DEG C, and phosphating time is 15-25min.
2. the preparation method of a kind of martensite steel pipe according to claim 1, it is characterised in that: the aperture of described centre hole is more than 15mm, and the degree of depth is 10-25mm.
3. the preparation method of a kind of martensite steel pipe according to claim 1, it is characterised in that: in annealing process, described in step e, the method for cooling is Slow cooling in asbestos insulation can.
4. the preparation method of a kind of martensite steel pipe according to claim 1, it is characterised in that: the pickling temperature in described step 3) is 50-60 DEG C, and pickling time is 30-50min.
5. the preparation method of a kind of martensite steel pipe according to claim 1, it is characterised in that: described pickle solution is the mixed solution of dilute sulphuric acid and sodium chloride solution.
6. the preparation method of a kind of martensite steel pipe according to claim 5, it is characterised in that: in described pickle solution, the whole volumetric molar concentration of dilute sulphuric acid is 20-30%, and described sodium chloride solution final concentration is 4-6%.
7. the preparation method of a kind of martensite steel pipe according to claim 1, it is characterised in that: the martensite steel pipe base after annealing also should be carried out aligning 3-4 time before pickling by described step 3).
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