CN103556069B - A kind of gas cylinder seamless large-diameter pipes and manufacture method thereof - Google Patents
A kind of gas cylinder seamless large-diameter pipes and manufacture method thereof Download PDFInfo
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Abstract
The invention belongs to metallurgical technology field, propose a kind of gas cylinder seamless large-diameter pipes and manufacture method thereof.Chemical composition and the mass percent of a kind of gas cylinder seamless large-diameter pipes proposed are: C0.30% ~ 0.60%, Si:0.20 ~ 0.50%, Mn:0.20 ~ 0.60%, P :≤0.010%, S :≤0.010%, Cr:0.90 ~ 1.70%, Ni:2.50 ~ 3.50%, Mo:0.25 ~ 0.55%, V:0.05 ~ 0.25%, surplus is Fe; Manufacture method adopts sponge iron and steel scrap to do steelmaking feed.The Heat stability is good of the seamless large-diameter pipes that the present invention obtains, intensity are high, and have good impelling strength, stable rupture ductility, high thermostrength, excellent corrosion resistance nature and anti-fatigue performance, and its yield strength is not less than 1000MPa.
Description
Technical field
The invention belongs to metallurgical technology field, be specifically related to a kind of gas cylinder seamless large-diameter pipes and manufacture method thereof.
Background technology
Large volume seamless steel gas cylinder is applied comparatively wide at home, is mainly used in the fields such as the transport of the industrial gasses such as natural gas liquids.The operating pressure of early stage seamless gas cylinder is lower, and unit weight is smaller, and its material is mainly soft steel.In recent years, along with the raising of seamless gas cylinder operating pressure, the continuous increase of volume to weight ratio, seamless steel gas cylinder steel from soft steel to medium carbon steel, C-Mn steel and Cr-Mo steel development, Cr-Mo system steel alloy has the advantage keeping high strength simultaneously to have good toughness plasticity, is thus subject to widespread use.At present, the large volume seamless steel gas cylinder operating pressure of domestic use mostly is 20 ~ 25MPa, its material multiselect 30CrMo steel or 35CrMo steel.But along with the continuous progress of technology, require to improve further to the volume to weight ratio of steel cylinder, operating pressure requires higher than Cr-Mo system steel alloys such as existing 25MPa, 35CrMo because intensity can not be satisfied the demand lower than design requirements.
Summary of the invention
For solving the problems of the technologies described above, object of the present invention proposes a kind of gas cylinder seamless large-diameter pipes and manufacture method thereof.
The present invention adopts following technical scheme for completing above-mentioned purpose:
A kind of gas cylinder seamless large-diameter pipes, the chemical composition of described seamless large-diameter pipes and mass percent are: C:0.30% ~ 0.60%, Si:0.20 ~ 0.50%, Mn:0.20 ~ 0.60%, P :≤0.010%, S :≤0.010%, Cr:0.90 ~ 1.70%, Ni:2.50 ~ 3.50%, Mo:0.25 ~ 0.55%, V:0.05 ~ 0.25%, surplus is Fe.
C be solid solution in the substrate or as Carbide Precipitation, be the principal element of the intensity increasing steel, along with C content in steel increases, its yield-point and tensile strength raise, but toughness plasticity reduces; In the present invention, for guaranteeing desired intensity, C content must more than 0.30%, if but more than 0.60%, then the toughness plasticity of steel worsens; Therefore, C content is limited to the scope of 0.30% ~ 0.60%.
Si is good reductor, adds silicon as reductive agent and reductor in steelmaking process, and meanwhile, Si can be dissolved in the hardness and intensity that improve steel in ferrite and austenite, and its effect is only second to P, and comparatively the element such as Mn, Ni, Cr, W, Mo and V is strong; But during containing Si more than 2.0%, will significantly reduce plasticity and the toughness of steel; Therefore, Si is limited to the scope of 0.01 ~ 2.0%; But, from the viewpoint of intensity-toughness plasticity balance, preferably Si content is limited in the scope of 0.20 ~ 0.50%.
Mn is good reductor and sweetening agent, adds a certain amount of Mn in steel, can eliminate or weaken the red brittleness of the steel caused by S, thus improve the hot workability of steel; Mn in steel and Fe form sosoloid, improve ferrite and austenitic hardness and intensity in steel; Be again carbide forming element, enter in cementite and replace a part of Fe atom, Mn can reduce critical transition temperature, plays the effect of refine pearlite simultaneously, also indirectly plays and improves perlitic steel intensity; It is that the ability of austenite structure is only second to Ni that Mn stablizes, and also strongly increases the hardening capacity of steel; But Mn easily causes grain growth when content is more in steel, steel grade is caused to become essential coarse-grained steel; Meanwhile, Mn easily forms MnS with S, causes the solidity to corrosion of steel to decline, thus in steel Mn content generally not higher than 0.6%; Therefore, Fe content is preferably on the low side, but considers from economy when producing, then allow its scope to be 0.20 ~ 0.60%.
In the ordinary course of things, P is harmful element in steel, can increase the cold shortness of steel, reduces toughness plasticity, cold-bending property is degenerated; Therefore the P content of weldless steel tube is less than or equal to 0.010%.
S is also harmful element under normal conditions, makes steel produce red brittleness, reduces ductility and the toughness of steel, causes crackle when forging and rolling; But S can reduce the erosion resistance of steel, so usually require that S content is less than 0.055%, the S content of weldless steel tube is less than or equal to 0.010%.
Cr can increase the hardening capacity of steel and have secondary hardening effect, improves the intensity of steel, hardness and wear resistance and does not make steel become fragile, but can reduce unit elongation and relative reduction in area; The Main Function of Cr in modified structure iron improves hardening capacity, makes steel after Q-tempering, have good comprehensive mechanical property, can also form the carbide containing Cr in converted steel, thus improve the wear resistance of material surface; Thus the Cr content in structural alloy steel generally higher than 0.9%, to ensure the intensity of steel, hardness and hardening capacity; When in steel during Cr too high levels, the ductile-brittle transition temperature of steel significantly improves, and meanwhile, steel belt roof bolt fragility significantly increases, therefore Cr content in this kind of steel is general not higher than 1.7%, and namely the Cr content of weldless steel tube is restricted to 0.90 ~ 1.70%.
Ni can while raising hardness of steel, little compared with the impact of other alloying elements on the infringement of the toughness of steel, plasticity and other processing performances; For medium carbon steel, because Ni reduces perlitic transformation temperature, perlite is attenuated; Again because Ni reduces the ni content of eutectoid point, thus with the carbon steel ratio of identical C content, its pearlite fraction is more, makes the carbon steel of the more identical C content of intensity of the pearlitic ferrite steel containing Ni high; Ni namely can improve steel to the drag of fatigue and reduce steel to the susceptibility of breach, can reduce again the low temperature brittleness transition temperature of steel, this has epochmaking meaning to Cryogenic Steel; In addition, Ni adds can not only be acidproof in steel, and energy alkali resistant, has resistance to corrosion to air and salt; Because this steel grade is to the toughness of material, ductile-brittle transition temperature, notch sensitivities etc. require higher, and the Ni content thus in steel is higher than 2.5%; But because domestic Ni content is less, Ni price is high, Cr-Ni steel easily produces temper brittleness and white point simultaneously, and consider from factors such as costs, Ni content is not higher than 3.5%; Therefore the Ni content of weldless steel tube controls 2.50 ~ 3.50%.
Mo can improve hardening capacity and heat resistance in steel, and crystal grain thinning prevents temper brittleness, increases the corrosion stability of steel in some medium; Enough intensity and creep resisting ability is kept when high temperature; In quenched and tempered steel, Mo can make to quench deeply compared with the part of big cross section, through hardening, improves temper resistance or the temper resistance of steel, makes part can tempering at relatively high temperatures, thus more effectively eliminates unrelieved stress, improves plasticity; In structural alloy steel, Mo constituent content generally just plays good action after 0.25%, and when Mo content is more than 0.55%, then high temper steel can be made on the contrary to become fragile; Therefore in weldless steel tube, the content of Mo controls 0.25 ~ 0.55%.
V mainly exists with the form of carbide in steel; Its Main Function is tissue and the crystal grain of refinement steel, reduces the superheated susceptivity of steel, improves intensity and the toughness of steel; V can increase the temper resistance of hardened steel, and produces secondary hardening effect; For keeping V can thinning microstructure crystal grain, improve obdurability and hardening capacity, the general >0.05% of V content in structural alloy steel, in structural alloy steel, in order to avoid temper brittleness, the content of V should not higher than 0.25%, and therefore in weldless steel tube, the content of V controls 0.05 ~ 0.25%.
A kind of preparation method of gas cylinder seamless large-diameter pipes, described manufacture method adopts sponge iron and steel scrap to do steelmaking feed, molten steel is fused into electric arc furnace, after external refining and vacuum outgas, be molded into circular pipe, cooled die casting pipe is heated in rotary heating furnace, heat centering, hot piercing, periodically rolling, through determining reducing and rolling, cooling, fixed length sawing, aligning; After flaw detection, carry out normalizing thermal treatment, tempering, hot size, hot straightening, finally detect a flaw; Concrete steps are as follows:
(1), the proportioning of raw material: steel scrap 75 ~ 85 parts, sponge iron 15 ~ 25 parts;
(2), by raw material drop in electric arc furnace, after electrified regulation, raw material is melted into molten steel gradually, and adopt simultaneously and blow end stirring technique, accelerate the fusing of steel and the homogenizing of heating, the furnace temperature of final electric arc furnace reaches 1500 ~ 1600 DEG C, and has made the slag of melting period;
(3), in electric arc furnace, drop into 0.246 ~ 0.274 part, quickened lime stone, be blown into oxygen and argon gas by the nozzle be arranged on bottom electric arc furnace to molten bath in electric arc furnace simultaneously, make the sulphur in molten steel, phosphorus impurities element forms slag on molten steel; And the chemical composition of Real-Time Monitoring molten steel, when the chemical composition of molten steel does not reach the necessary chemical composition of seamless large-diameter pipes, in electric arc furnace, drop into sponge iron or other iron alloy; The chemical composition in molten steel is made to arrive the necessary chemical composition of seamless large-diameter pipes;
(4), in LF cast refining bag, CaO-Al is poured into
2o
3base essence 0.30 ~ 0.33 part, slag, and then molten steel qualified for the composition obtained in step (3) is injected LF cast refining bag, carry out oxygen blast in electric arc furnace, molten steel and CaO-Al simultaneously
2o
3base essence slag carries out melting in the electric arc furnace of oxidizing atmosphere, be incubated, dephosphorization, decarburization and alloying; Stir molten steel simultaneously;
(5), at 130L/(mint) strong mixing condition under to pour into a mould in refining bag to LF and be blown into argon gas, carry out degassed, deoxidation, desulfurization process, in molten steel, drop into pure metal powder while stirring, object is removal of inclusions and carries out trimming simultaneously;
(6), by LF pour into a mould in refining bag and vacuumize, reduce the hydrogen in steel; In molten steel, dropping into silicon under vacuum carry out deoxidation, there is boiling phenomenon in molten steel immediately, gas effusion in steel, and inclusion also forms slag along with boiling stirring surface floats, and carries out the operation of dehydrogenation, denitrogenation;
(7), by molten steel being poured onto cross section is in circular grinding tool, is cooled to close to room temperature, carries out cogging subsequently, and excision cap mouth and some unwanted parts, can obtain chemical composition necessary with seamless large-diameter pipes and require consistent steel billet;
(8) enter straightener after the steel billet, to step (7) obtained carries out throwing, after completing and solidifying, cut into the die casting pipe of scale until strand aligning by cutting unit;
(9), heat being cooled to the die casting pipe of less than 650 DEG C to send in rotary heating furnace, the homogeneous temperature of pipe is made to reach 1250 ~ 1280 DEG C, 1240 ~ 1260 DEG C time, heat centering is carried out to die casting pipe, 1150 ~ 1230 DEG C time, hot piercing is carried out to die casting pipe, 1050 ~ 1150 DEG C time, periodicity tandem rolling is carried out to die casting pipe; When carrying out periodicity rolling, because the different circumference of steel pipe is all subject to the effect of even rolling load; By the roll location in controlled rolling process and roll gap, thus reach the object controlling thickness of steel pipe and form variations, prevent thickness of steel pipe uneven excessive with ovality; Meanwhile, due to periodicity continuous rolling process, the linearity of steel pipe is higher, and sinuousness is less;
(10), after determining reducing and rolling, cooling, fixed length sawing, aligning, flaw detection, heat-treat, 1000 ~ 1050 DEG C time, use normalizing furnace normalizing, prevent oxidation;
(11), 680 ~ 720 DEG C time tempering is carried out with annealing furnace, to eliminate the unrelieved stress in steel pipe; Carry out hot size when being cooled to 600 ~ 620 DEG C after tempering, carry out hot straightening when being cooled to 500 ~ 550 DEG C after hot size, finally detect a flaw, be made into circular pipe.
The mechanical property of the weldless steel tube adopting aforesaid method to prepare samples and sample preparation according to the ASTM standard-required of the U.S., and the index that its mechanical property reaches is as follows:
Yield strength (R
p0.2):>=1000MPa;
Tensile strength (R
m):>=1200MPa;
Unit elongation (A): >=20%;
Hardness (HB): 296 ~ 400;
Impelling strength: >=80J (-20 DEG C);
Wall thickness deviation :≤± 8.5t%(t is the wall thickness of weldless steel tube);
Outside diameter tolerance :≤± 0.5d%(d is the diameter of weldless steel tube).
A kind of gas cylinder seamless large-diameter pipes that the present invention proposes and manufacture method thereof, seamless steel pipe for gas cylinder is made to have uniform wall thickness by periodicity continuous rolling process, surface quality is high, the features such as fine microstructures, by follow-up thermal treatment (normalizing+tempering) and straightening process, make the mechanical property of seamless steel pipe for gas cylinder body, hot strength, corrosion resistance nature and anti-fatigue performance reach the level required by standard, in its pressure run and temperature range, there is sufficient safety margin, the requirement of the anticorrosive of body and antifatigue can be met simultaneously, by periodicity tandem rolling and follow-up tempering process, the geometrical dimension of effective control steel pipe, unrelieved stress and form variations, the mechanical property of body can be ensured, hot strength, corrosion resistance nature and anti-fatigue performance, be applicable to the gas cylinder of operating pressure higher than 25MPa, in sum, the Heat stability is good of the seamless large-diameter pipes that the present invention adopts above-mentioned manufacture method to obtain, intensity are high, and there is good impelling strength, stable rupture ductility, high thermostrength, excellent corrosion resistance nature and anti-fatigue performance, its yield strength is not less than 1000MPa.
Embodiment
In conjunction with specific embodiments the present invention is described further:
Chemical composition and the mass percent of more than 25MPa operating pressure gas cylinder seamless large-diameter pipes are C0.35, Si0.35, Mn0.27, Cr1.35, Ni2.95, Mo0.35, V0.14, P0.007, S0.005, and other is Fe.
A kind of preparation method of gas cylinder seamless large-diameter pipes, described manufacture method adopts sponge iron and steel scrap to do steelmaking feed, molten steel is fused into electric arc furnace, after external refining and vacuum outgas, be molded into circular pipe, cooled die casting pipe is heated in rotary heating furnace, heat centering, hot piercing, periodically rolling, through determining reducing and rolling, cooling, fixed length sawing, aligning; After flaw detection, carry out normalizing thermal treatment, tempering, hot size, hot straightening, finally detect a flaw; Concrete steps are as follows:
(1), the proportioning of raw material: steel scrap 75 ~ 85 parts, sponge iron 15 ~ 25 parts;
(2), by raw material drop in electric arc furnace, after electrified regulation, raw material is melted into molten steel gradually, and adopt simultaneously and blow end stirring technique, accelerate the fusing of steel and the homogenizing of heating, the furnace temperature of final electric arc furnace reaches 1500 ~ 1600 DEG C, and has made the slag of melting period;
(3), in electric arc furnace, drop into 0.246 ~ 0.274 part, quickened lime stone, be blown into oxygen and argon gas by the nozzle be arranged on bottom electric arc furnace to molten bath in stove simultaneously, make the sulphur in molten steel, phosphorus impurities element forms slag on molten steel; And the chemical composition of Real-Time Monitoring molten steel, when the chemical composition of molten steel does not reach the necessary chemical composition of seamless large-diameter pipes, in electric arc furnace, drop into sponge iron or other iron alloy; The chemical composition in molten steel is made to arrive the necessary chemical composition of seamless large-diameter pipes; Other iron alloy comprises containing Si, Mn, Cr, Ni, Mo, V alloy element, and its add-on is specifically determined by molten steel composition;
(4), in LF cast refining bag, CaO-Al is poured into
2o
3base essence 0.30 ~ 0.33 part, slag, then molten steel qualified for the composition obtained in step (3) is injected LF and pour into a mould refining bag, the object pouring CaO-Al2O3 base essence slag into is when being poured in refining ladle by molten steel, impact by molten steel makes synthetic slag emulsification, slag and steel fully mix, and then calm, the slag of emulsification drips floating, to complete the refining task of desulfurization, part deoxidation, removal nonmetal inclusion, then molten steel and CaO-Al
2o
3base essence slag carries out melting in the stove of oxidizing atmosphere, be incubated, dephosphorization, decarburization and alloying; Stir molten steel simultaneously;
(5), at 130L/(mint) strong mixing condition under to pour into a mould in refining bag to LF and be blown into argon gas, carry out degassed, deoxidation, desulfurization process, in molten steel, drop into pure metal powder while stirring, object is removal of inclusions and carries out trimming simultaneously;
(6), by LF pour into a mould in refining bag and vacuumize, reduce the hydrogen in steel; In molten steel, dropping into silicon under vacuum carry out deoxidation, there is boiling phenomenon in molten steel immediately, gas effusion in steel, and inclusion also forms slag along with boiling stirring surface floats, and carries out the operation of dehydrogenation, denitrogenation;
(7), molten steel being poured onto cross section is in circular grinding tool, be cooled to close to room temperature, carry out cogging subsequently, due in cap mouth place steel billet because solidifying time speed of cooling and gas etc. affect and make this place's impurity content higher, therefore excise cap mouth and some unwanted parts, chemical composition necessary with seamless large-diameter pipes can be obtained and require consistent steel billet;
(8) enter straightener after the steel billet, to step (7) obtained carries out throwing, after completing and solidifying, cut into the die casting pipe of scale until strand aligning by cutting unit;
(9), heat being cooled to the die casting pipe of less than 650 DEG C to send in rotary heating furnace, the homogeneous temperature of pipe is made to reach 1250 ~ 1280 DEG C, 1240 ~ 1260 DEG C time, heat centering is carried out to die casting pipe, 1150 ~ 1230 DEG C time, carry out hot piercing to die casting pipe, the PQF tri-roller limiting mandrel tandem rolling pipe machine adopting German SMSMeer/INNSE company to produce 1050 ~ 1150 DEG C time carries out periodicity tandem rolling to die casting pipe; When carrying out periodicity rolling, because the different circumference of steel pipe is all subject to the effect of even rolling load; By the roll location in controlled rolling process and roll gap, thus reach the object controlling thickness of steel pipe and form variations, prevent thickness of steel pipe uneven excessive with ovality; Meanwhile, due to periodicity continuous rolling process, the linearity of steel pipe is higher, and sinuousness is less.
(10), after determining reducing and rolling, cooling, fixed length sawing, aligning, flaw detection, heat-treat, 1000 ~ 1050 DEG C time, use normalizing furnace normalizing, prevent oxidation;
(11), 680 ~ 720 DEG C time tempering is carried out with annealing furnace, to eliminate the unrelieved stress in steel pipe; Carry out hot size when being cooled to 600 ~ 620 DEG C after tempering, carry out hot straightening when being cooled to 500 ~ 550 DEG C after hot size, finally detect a flaw, be made into circular pipe.
The mechanical property of the weldless steel tube adopting aforesaid method to prepare samples and sample preparation according to the ASTM standard-required of the U.S., and the index that its mechanical property reaches is as follows:
Yield strength (R
p0.2):>=1000MPa;
Tensile strength (R
m):>=1200MPa;
Unit elongation (A): >=20%;
Hardness (HB): 296 ~ 400;
Impelling strength: >=80J (-20 DEG C);
Wall thickness deviation :≤± 8.5t%(t is the wall thickness of weldless steel tube);
Outside diameter tolerance :≤± 0.5d%(d is the diameter of weldless steel tube).
In the manufacture method of above-mentioned weldless steel tube, the melting of molten steel, refining, the shaping of die casting pipe are proven technique in prior art, do not do too much explanation at this.
Claims (1)
1. the preparation method of a gas cylinder seamless large-diameter pipes, the chemical composition of described seamless large-diameter pipes and mass percent are: C:0.30% ~ 0.60%, Si:0.20 ~ 0.50%, Mn:0.20 ~ 0.60%, P :≤0.010%, S :≤0.010%, Cr:0.90 ~ 1.70%, Ni:2.50 ~ 3.50%, Mo:0.25 ~ 0.55%, V:0.05 ~ 0.25%, surplus is Fe; The preparation method of seamless large-diameter pipes is: iron and steel scrap do steelmaking feed, molten steel is fused into electric arc furnace, after external refining and vacuum outgas, be molded into circular pipe, cooled die casting pipe is heated in rotary heating furnace, heat centering, hot piercing, periodically rolling, through determining reducing and rolling, cooling, fixed length sawing, aligning; After flaw detection, carry out normalizing thermal treatment, tempering, hot size, hot straightening, finally detect a flaw; Concrete steps are as follows:
(1), the proportioning of raw material: steel scrap 75 ~ 85 parts, sponge iron 15 ~ 25 parts;
(2), by raw material drop in electric arc furnace, after electrified regulation, raw material is melted into molten steel gradually, and adopt simultaneously and blow end stirring technique, accelerate the fusing of steel and the homogenizing of heating, the furnace temperature of final electric arc furnace reaches 1500 ~ 1600 DEG C, and has made the slag of melting period;
(3), in electric arc furnace, drop into 0.246 ~ 0.274 part, quickened lime stone, be blown into oxygen and argon gas by the nozzle be arranged on bottom electric arc furnace to molten bath in electric arc furnace simultaneously, make the sulphur in molten steel, phosphorus impurities element forms slag on molten steel; And the chemical composition of Real-Time Monitoring molten steel, when the chemical composition of molten steel does not reach the necessary chemical composition of seamless large-diameter pipes, in electric arc furnace, drop into sponge iron or other iron alloy; The chemical composition in molten steel is made to arrive the necessary chemical composition of seamless large-diameter pipes;
(4), in LF cast refining bag, CaO-Al is poured into
2o
3base essence 0.30 ~ 0.33 part, slag, and then molten steel qualified for the composition obtained in step (3) is injected LF cast refining bag, carry out oxygen blast in electric arc furnace, molten steel and CaO-Al simultaneously
2o
3base essence slag carries out melting in the electric arc furnace of oxidizing atmosphere, be incubated, dephosphorization, decarburization and alloying; Stir molten steel simultaneously;
(5), at 130L/(mint) strong mixing condition under to pour into a mould in refining bag to LF and be blown into argon gas, carry out degassed, deoxidation, desulfurization process, in molten steel, drop into pure metal powder while stirring, object is removal of inclusions and carries out trimming simultaneously;
(6), by LF pour into a mould in refining bag and vacuumize, reduce the hydrogen in steel; In molten steel, dropping into silicon under vacuum carry out deoxidation, there is boiling phenomenon in molten steel immediately, gas effusion in steel, and inclusion also forms slag along with boiling stirring surface floats, and carries out the operation of dehydrogenation, denitrogenation;
(7), by molten steel being poured onto cross section is in circular grinding tool, is cooled to close to room temperature, carries out cogging subsequently, and excision cap mouth and some unwanted parts, can obtain chemical composition necessary with seamless large-diameter pipes and require consistent steel billet;
(8) enter straightener after the steel billet, to step (7) obtained carries out throwing, after completing and solidifying, cut into the die casting pipe of scale until strand aligning by cutting unit;
(9), heat being cooled to the die casting pipe of less than 650 DEG C to send in rotary heating furnace, the homogeneous temperature of pipe is made to reach 1250 ~ 1280 DEG C, 1240 ~ 1260 DEG C time, heat centering is carried out to die casting pipe, 1150 ~ 1230 DEG C time, hot piercing is carried out to die casting pipe, 1050 ~ 1150 DEG C time, die casting pipe is rolled;
(10), after determining reducing and rolling, cooling, fixed length sawing, aligning, flaw detection, heat-treat, 1000 ~ 1050 DEG C time, use normalizing furnace normalizing, prevent oxidation;
(11), 680 ~ 720 DEG C time tempering is carried out with annealing furnace, to eliminate the unrelieved stress in steel pipe; Carry out hot size when being cooled to 600 ~ 620 DEG C after tempering, carry out hot straightening when being cooled to 500 ~ 550 DEG C after hot size, finally detect a flaw, be made into circular pipe; It is characterized in that: periodically tandem rolling is adopted to the rolling that die casting pipe carries out; When carrying out periodicity rolling, because the different circumference of steel pipe is all subject to the effect of even rolling load; By the roll location in controlled rolling process and roll gap, thus reach the object controlling thickness of steel pipe and form variations, prevent thickness of steel pipe uneven excessive with ovality; Meanwhile, due to periodicity continuous rolling process, the linearity of steel pipe is higher, and sinuousness is less.
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| CN101706020A (en) * | 2009-11-23 | 2010-05-12 | 天津商业大学 | Method for preparing high alloy steel seamless steel pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS599154A (en) * | 1982-07-05 | 1984-01-18 | Kawasaki Steel Corp | Material for tool for manufacturing seamless steel pipe |
| JPH02179843A (en) * | 1988-12-29 | 1990-07-12 | Sumitomo Metal Ind Ltd | Tool material for hot tube making |
| DE102006025241A1 (en) * | 2006-05-29 | 2007-12-06 | Rheinmetall Waffe Munition Gmbh | Method for producing forged steel for highly stressed weapons, tube blanks and a weapon equipped therewith |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2669178B2 (en) * | 1991-05-08 | 1997-10-27 | 住友金属工業株式会社 | High toughness and high strength seamless steel pipe |
| RU2020184C1 (en) * | 1991-10-14 | 1994-09-30 | Пермский машиностроительный завод им.В.И.Ленина | Steel |
| CN101706020A (en) * | 2009-11-23 | 2010-05-12 | 天津商业大学 | Method for preparing high alloy steel seamless steel pipe |
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