CN113265595B - Continuous casting billet for low-alloy seamless tube and production method thereof - Google Patents
Continuous casting billet for low-alloy seamless tube and production method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
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Abstract
The invention discloses a continuous casting billet for a low-alloy seamless tube, wherein the total mass percentage content of Cr, Mn and Mo is less than or equal to 5%, the proportion of columnar crystals in the continuous casting billet is more than or equal to 95%, and the number of point-like segregants larger than 0.5mm in an equiaxed crystal area is less than 15. Correspondingly, the invention also discloses a production method of the continuous casting billet for the low-alloy seamless tube. The continuous casting process is optimized, the columnar crystal proportion is controlled, the point segregation is reduced, and the core defects of the casting blank are improved by slightly pressing the tube blank by using the pressure of the withdrawal and straightening unit. The billet produced by the production method has high core quality of the casting blank and less point segregation, and can be subsequently used for preparing a low-alloy seamless pipe with greatly improved inner wall banded segregation.
Description
Technical Field
The invention relates to a steel and a production method thereof, in particular to a continuous casting billet and a production method thereof.
Background
With the increasing expansion of the demand of national production on oil and gas resources, the oil well pipe needs higher performance in the aspects of high strength and toughness, high temperature and high pressure resistance, hydrogen sulfide stress corrosion resistance, carbon dioxide corrosion resistance and the like. This has led to the growing emphasis on the problem of segregation in the inner wall of seamless pipes, which was not of much concern. In low alloy steel oil well pipes, the internal wall segregation significantly affects their toughness, hydrogen sulfide stress corrosion, hydrogen induced cracking and fatigue strength. At present, the inner wall segregation of the seamless steel pipe has no effective control means in the aspects of quality control of the pipe blank, pipe rolling heat treatment and the like. Usually, only higher alloy elements such as Cr, Mo and the like are added to ensure the performance of the segregation zone on the inner wall of the steel pipe. The addition of these alloying elements can greatly increase manufacturing costs.
Researches show that the segregation of the casting blank has certain genetic influence on the strip defects of the rolled material and the strip structure of a final product, and elements such as C, P, S, Mn, Mo and the like are easy to form micro or semi-macro segregation in the cast product and then are left in the rolled material through a hot rolling process to form elongated MnS inclusions or strip-shaped hardened structures. Therefore, in order to obtain a high-quality seamless pipe, the segregation of elements in the as-cast product must be strictly controlled.
Generally, the center segregation in a cast slab often consists of spot-like segregants of circular or oval shape having a size of about 300 μm to 3mm, which is called spot-like segregants or semi-macrosegregations.
In ingot, the punctate segregation has two different mechanisms of formation:
(1) because of poor deoxidation of the molten steel, gas escapes when the molten steel is solidified. In the rising process, the original unstable dendrite frame or small crystal nucleus is washed away by the bubbles, and the unset enriched low-melting-point components and the included viscous molten steel among the dendrites are backfilled, so that the viscous molten steel forms point segregation after being solidified.
(2) As the concentrated solution among dendrites has the characteristics of light specific gravity and small surface tension, the concentrated solution among dendrites naturally floats upwards in a strip or point shape to form point segregation. If the section size of the cast ingot is large, the heat is difficult to dissipate, and the cooling speed of the liquid alloy is slow, favorable conditions are created for the aggregation and the floating of the solution with low melting point between dendrites. In the casting blank, because the solidification of the molten steel is carried out in a dendritic crystal growth mode, alloy elements are gathered among dendrites, so that the concentration of the elements in the dendrites is reduced, and the difference is generated between the dendrites and the distribution of the elements in the dendrites. As the temperature is reduced, the equiaxed crystals continue to solidify and generate micro segregation, solidification shrinkage is generated at the final solidification end, and because the equiaxed crystals obstruct the feeding of the molten steel, negative pressure is generated in a space formed by the mutual adhesion of a plurality of equiaxed crystals, the molten steel with solute enriched among dendrites is sucked, and the punctiform segregation is formed.
The prior art only provides a certain control measure for optimizing the macrosegregation, and has no effective means for controlling the semi-macrosegregation or the point-shaped segregation of the center of the casting blank influencing the subsequent process, but the semi-macrosegregation or the point-shaped segregation of the casting blank can be directly inherited as the inner wall banded segregation of the subsequent seamless tube product.
For example: chinese patent publication No. CN103350216A, published as 2013, 10, 16, and entitled "a method for controlling ingot homogenization" discloses a method in which molten metal is poured layer by layer in a casting mold, casting and solidification are alternately performed, and after a last cast layer is poured, casting is stopped, and solidification is performed layer by using micro-ladle casting. The method controls the macrosegregation within a small thickness range of each casting layer, so that the solidification time difference between solidification layers is small, the grain size difference is small, and the homogenization effect is achieved. Although the present invention solves the problem of macrosegregation of a tube blank, it does not relate to how to solve the problem of punctiform segregation.
Another example is: chinese patent publication No. CN105568122A, published as 2016, 5, 11, and entitled "center segregation control method of 30CrMo round tube billet with phi 280 mm", discloses a technique that combines electromagnetic stirring of a crystallizer with electromagnetic stirring of a solidification end to make the billet shell grow uniformly. The columnar crystal structure is continuously scoured and fused in the stirring process, the equiaxial crystal nucleation rate is improved, and the columnar crystal growth is inhibited, so that the center segregation of the casting blank is avoided or reduced. The invention reduces center segregation by inhibiting the growth of columnar crystals and improving the proportion of equiaxed crystals.
For another example: chinese patent publication No. CN105950951A, published as 2016, 9, 21, entitled "method for improving solute carbon segregation in billet" discloses a method for improving solute carbon segregation in billet by adding rare earth element, wherein trace rare earth cerium is added to improve equilibrium partition coefficient of solute carbon in solidification system, thereby achieving the purpose of substantially improving solute carbon segregation. Although the segregation of carbon is suppressed by adding rare earth elements, the segregation of elements such as Mn, Cr, and Mo cannot be effectively suppressed, and the production cost is relatively high.
Disclosure of Invention
One of the purposes of the invention is to provide a continuous casting billet for a low-alloy seamless pipe, which aims to reduce the point segregation at the core of the casting billet and solve the problems of looseness, shrinkage cavity and the like at the core of the casting billet of the existing continuous casting billet, thereby improving the problem of the zonal segregation of the inner wall of a seamless steel pipe rolled by the continuous casting billet for the low-alloy seamless pipe after subsequent perforation.
In order to achieve the purpose, the invention provides a continuous casting billet for a low-alloy seamless tube, wherein the total mass percentage content of Cr, Mn and Mo in the continuous casting billet is less than or equal to 5%, the columnar crystal proportion in the continuous casting billet is more than or equal to 95%, and the number of point-like segregants larger than 0.5mm in an equiaxed crystal area is less than 15.
Another object of the present invention is to provide a low alloy seamless tube which is produced using the above continuous casting slab for a low alloy seamless tube.
Accordingly, another object of the present invention is to provide a method for producing the above continuous casting slab for low-alloy seamless tubes, which has a simple process, and greatly reduces the cost of alloy and improves the core quality of the casting slab by controlling the proportion of columnar crystals and reducing point-like segregation through process optimization for the continuous casting process.
In order to achieve the above object, the present invention provides the above method for producing a continuous casting slab for a low-alloy seamless tube, comprising:
controlling the superheat degree of molten steel at 30-50 ℃ in the casting process;
a stirring mode combining crystallizer electromagnetic stirring and solidification tail end electromagnetic stirring is adopted;
the casting pulling speed is controlled to be 1.4-2.0m/min, and the specific water amount of the secondary cooling water of the continuous casting machine is controlled to be 0.6-1.0L/kg.
It should be noted that, in the production method of the present invention, the superheat degree of molten steel is controlled in the casting process, and compared with the conventional process, the present invention further improves the superheat degree of molten steel. The aim is to develop columnar crystals of the casting blank, so that slagging of the crystallizer is facilitated, temperature loss in the casting process can be compensated, and the temperature gradient is increased. However, the inventors have found through studies that the degree of superheat is not so high as to cause central shrinkage or cracking. Therefore, in the production method of a continuous casting slab for a low-alloy seamless tube according to the present invention, the degree of superheat of molten steel during casting is controlled to be 30 to 50 ℃.
In the production method, a stirring mode combining electromagnetic stirring of a crystallizer and electromagnetic stirring at the solidification tail end is also adopted. When the crystallizer is used for electromagnetic stirring, molten steel can rotate and flow in the range of the crystallizer, so that the solidification front can be cleaned, an equiaxed crystal area is enlarged, and solidified shell shells are more uniform. However, when the crystallizer is adopted for electromagnetic stirring alone, the overheating dissipation of the molten steel in the crystallizer becomes fast, the solidification end point is slightly advanced, the surface temperature of the casting blank is slightly increased, and the thickness of the solidified blank shell in the crystallizer area is slightly reduced. Similarly, although the single use of solidification end electromagnetic stirring can improve the fluidity of the residual liquid metal, make the residual liquid phase enriched with solute more uniform, and improve the segregation of the continuous casting center, when the electromagnetic stirring amplitude is too large, the unreasonable flow can be caused, the equiaxed crystal area is enlarged, and finally the 'white bright band' of negative segregation is generated in the continuous casting center. Therefore, the inventor creatively provides a stirring mode combining electromagnetic stirring of the crystallizer and electromagnetic stirring of the solidification tail end, thereby not only taking the advantages of the electromagnetic stirring of the crystallizer and the electromagnetic stirring of the solidification tail end into consideration, but also overcoming the respective disadvantages.
In the production method, the columnar crystal ratio can be obviously improved due to the adoption of relatively high superheat degree. On the other hand, the risk of steel leakage is also brought due to the high degree of superheat, so that the inventor adopts a slow continuous casting drawing speed, namely 1.4-2.0m/min, to match with the drawing speed, thereby preventing the steel leakage and ensuring the good casting blank quality.
In addition, the inventor finds out that the position of the tail end electromagnetic stirring is close to the front according to the heat transfer calculation model, in order to exert the effect of the tail end electromagnetic stirring, under the premise that the pulling speed is not changed, the secondary cooling water amount is increased, the solidification end point can be moved forward, the effective action position of the solidification tail end electromagnetic stirring is delayed, meanwhile, the proportion of columnar crystals can be further increased, and the number of equiaxed crystal region point segregation is reduced. However, the secondary cooling specific water amount is increased to a certain degree, and the cooling effect is not obvious. Therefore, through comprehensive analysis, the secondary cooling specific water amount in the production method of the continuous casting billet for the low-alloy seamless pipe is controlled to be 0.60-1.00L/kg.
Further, in the production method of the present invention, wherein the degree of superheat of the molten steel during casting is controlled to be 35 to 45 ℃.
Further, in the production method of the present invention, the intensity of electromagnetic stirring (M-EMS) of the crystallizer is controlled to be 50-300A, and/or the intensity of electromagnetic stirring (F-EMS) at the solidification end is controlled to be 50-400A.
In some preferred embodiments, the intensity of the electromagnetic stirring for controlling the crystallizer can be 100-200A, and/or the intensity of the electromagnetic stirring for the solidification end can be 100-300A.
In the production method of the continuous casting billet for the low-alloy seamless pipe, the electromagnetic stirring intensity of the crystallizer is controlled to be 50-300A, preferably 100-200A, in order to take account of the quality of the casting billet and the proportion of columnar crystals; the intensity of the electromagnetic stirring at the end of the solidification is controlled between 50 and 400A, preferably between 100 and 300A.
Further, in the production method of the invention, the casting pulling speed can be controlled to be 1.6-1.8m/min, and/or the specific water amount of the secondary cooling water of the continuous casting machine can be controlled to be 0.7-0.9L/kg.
Further, in the production method, the frequency of electromagnetic stirring of the crystallizer is controlled to be 3-6Hz, and/or the frequency of electromagnetic stirring at the solidification tail end is controlled to be 3-6 Hz.
Further, in the production method provided by the invention, the soft reduction is carried out by adopting the reduction force of the withdrawal and straightening machine of the continuous casting machine, so that the radial reduction rate of the continuous casting billet is 1-7%.
In some preferred embodiments, the radial reduction of the slab may be controlled to be 2 to 5%.
In the production method, the pressure of the withdrawal and straightening unit is used for pressing, so that the defects of core cracks, shrinkage cavities, looseness and the like of the casting blank caused by developed columnar crystals are overcome. It should be noted that the rolling reduction is not too low, otherwise the core quality is not improved. Meanwhile, the rolling reduction is not too large, and casting accidents such as steel leakage and the like are easy to happen when the rolling reduction is too large.
The production method of the continuous casting billet for the low-alloy seamless pipe has simple process, controls the proportion of columnar crystals and reduces the point segregation by aiming at the process optimization of the continuous casting process, greatly reduces the alloy cost and improves the core quality of the casting billet.
Similarly, the continuous casting billet of the low-alloy seamless tube and the seamless tube manufactured by the continuous casting billet have the same beneficial effects.
Detailed Description
The continuous casting billet for low-alloy seamless tubes and the production method thereof according to the present invention will be further explained and illustrated with reference to specific examples, which, however, should not be construed to unduly limit the technical solution of the present invention.
Examples 1 to 6 and comparative examples 1 to 3
The chemical compositions of the steels used in the examples of the present invention and the comparative examples are shown in table 1.
TABLE 1 (mass fraction, wt%)
The continuous casting slab for the low-alloy seamless tube according to the present invention was smelted according to the chemical composition shown in table 1, and then cast. Wherein the process parameters in the casting step are controlled as follows (the specific parameters of each example of the present invention are shown in the following table 2):
controlling the superheat degree of molten steel at 30-50 ℃ in the casting process;
a stirring mode combining crystallizer electromagnetic stirring and solidification tail end electromagnetic stirring is adopted;
the casting and drawing speed is controlled to be 1.4-2.0m/min, and the specific water amount of secondary cooling water of the continuous casting machine is controlled to be 0.6-1.0L/kg.
The continuous casting slabs of comparative examples 1 to 3 were smelted according to the chemical compositions shown in Table 1 and then cast.
Table 2 shows the specific process parameters of the slabs of examples 1 to 6 and comparative examples 1 to 3.
Table 2.
Table 3 shows the columnar grain ratio, the point segregation behavior, and the defect behavior of the continuously cast slabs for low-alloy seamless pipes obtained in examples 1 to 6 of the present invention and comparative examples 1 to 3.
Table 3.
As can be seen from tables 2 and 3, due to the adoption of the technical scheme of the invention, the columnar crystal proportion of the continuous casting billets for the low-alloy seamless tubes prepared in the embodiments 1 to 6 of the invention is more than or equal to 95 percent, and the number of the point-like segregants larger than 0.5mm in the equiaxed crystal region is less than 11.
Further, the radial rolling reduction of the withdrawal straightening machine of the continuous casting machine of example 6 of the present invention was 1.0%, which was not within the preferable range of the present invention, and therefore, although the columnar grain ratio thereof satisfied 95% or more and the number of the point-like segregants larger than 0.5mm in the equiaxed grain region satisfied less than 15, the condition of the central defects thereof was relatively inferior to examples 1 to 5 of the present case.
In addition, as can be seen from tables 2 and 3, the superheat degree of the molten steel of comparative example 1 and comparative example 2 is controlled beyond the scope of the claims of the present application, and comparative example 3 adopts only the solidification end electromagnetic stirring, but does not adopt the stirring mode combining the crystallizer electromagnetic stirring and the solidification end electromagnetic stirring. Therefore, the columnar grain ratio of the continuous cast slabs obtained in comparative examples 1 to 3 and the number of the point-like segregants larger than 0.5mm in the equiaxed grain region could not satisfy the requirements of the present application.
It should be noted that the prior art in the protection scope of the present invention is not limited to the examples given in the specification, and all the prior art which is not inconsistent with the technical solution of the present invention, including but not limited to the prior patent documents, the prior publications and the like, can be included in the protection scope of the present invention.
In addition, the combination of the features in the present application is not limited to the combination described in the claims of the present application or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradictory to each other occurs.
It should also be noted that the above-listed embodiments are only specific embodiments of the present invention. It is apparent that the present invention is not limited to the above embodiments and similar changes or modifications thereto which can be directly or easily inferred from the disclosure of the present invention by those skilled in the art are intended to be within the scope of the present invention.
Claims (9)
1. The continuous casting billet for the low-alloy seamless tube is characterized in that the total mass percentage content of Cr, Mn and Mo in the continuous casting billet is less than or equal to 5 percent, the proportion of columnar crystals in the continuous casting billet is more than or equal to 95 percent, and the number of point-like segregants larger than 0.5mm in an equiaxed crystal region is less than 15; the continuous casting billet is prepared by adopting the following process:
controlling the superheat degree of molten steel at 36-50 ℃ in the casting process;
a stirring mode combining crystallizer electromagnetic stirring and solidification tail end electromagnetic stirring is adopted;
controlling the casting pulling speed to be 1.4-2.0m/min, and controlling the specific water amount of secondary cooling water of the continuous casting machine to be 0.6-1.0L/kg;
And carrying out soft reduction by adopting the reduction force of a withdrawal and straightening machine of a continuous casting machine so as to ensure that the radial reduction rate of the continuous casting billet is 1-7%.
2. A low-alloy seamless pipe produced using the continuous casting slab according to claim 1.
3. A method of producing a continuous casting slab as claimed in claim 1, characterized in that:
controlling the superheat degree of molten steel at 36-50 ℃ in the casting process;
a stirring mode combining crystallizer electromagnetic stirring and solidification tail end electromagnetic stirring is adopted;
controlling the casting pulling speed to be 1.4-2.0m/min, and controlling the specific water amount of secondary cooling water of the continuous casting machine to be 0.6-1.0L/kg;
and (3) carrying out soft reduction by adopting the reduction force of the withdrawal and straightening machine of the continuous casting machine so as to ensure that the radial reduction rate of the continuous casting billet is 1-7%.
4. The production method as claimed in claim 3, wherein the degree of superheat of the molten steel during casting is controlled to 36 to 45 ℃.
5. The production method according to claim 3, wherein the intensity of the electromagnetic stirring of the crystallizer is controlled to be 50 to 300A, and the intensity of the electromagnetic stirring of the solidification end is controlled to be 50 to 400A.
6. The production method as claimed in claim 5, wherein the intensity of the electromagnetic stirring of the crystallizer is controlled to be 100-200A, and the intensity of the electromagnetic stirring of the solidification end is controlled to be 100-300A.
7. The production method according to claim 3, wherein the casting pulling rate is controlled to 1.6 to 1.8m/min, and the specific water amount of the secondary cooling water of the continuous casting machine is controlled to 0.7 to 0.9L/kg.
8. The production method according to claim 3, wherein the frequency of the electromagnetic stirring of the crystallizer is controlled to be 3 to 6Hz, and the frequency of the electromagnetic stirring at the solidification end is controlled to be 3 to 6 Hz.
9. A production method according to claim 3, wherein the radial reduction of the slab is controlled to 2 to 5%.
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| CN105537549A (en) * | 2015-12-14 | 2016-05-04 | 攀钢集团成都钢钒有限公司 | Production method of continuous casting round billet of seamless steel tube steel at low temperature of minus 100 DEG C |
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| CN105537549A (en) * | 2015-12-14 | 2016-05-04 | 攀钢集团成都钢钒有限公司 | Production method of continuous casting round billet of seamless steel tube steel at low temperature of minus 100 DEG C |
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