CN115679184A - Production method of ultra-low-sulfur-resistant pipeline steel - Google Patents
Production method of ultra-low-sulfur-resistant pipeline steel Download PDFInfo
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- CN115679184A CN115679184A CN202211286623.0A CN202211286623A CN115679184A CN 115679184 A CN115679184 A CN 115679184A CN 202211286623 A CN202211286623 A CN 202211286623A CN 115679184 A CN115679184 A CN 115679184A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 54
- 239000010959 steel Substances 0.000 title claims abstract description 54
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 38
- 239000011593 sulfur Substances 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 50
- 238000007670 refining Methods 0.000 claims abstract description 42
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000002893 slag Substances 0.000 claims abstract description 31
- 238000009749 continuous casting Methods 0.000 claims abstract description 25
- 238000003723 Smelting Methods 0.000 claims abstract description 22
- 238000010079 rubber tapping Methods 0.000 claims abstract description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000010936 titanium Substances 0.000 claims abstract description 19
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 19
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 16
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 16
- 239000004571 lime Substances 0.000 claims abstract description 16
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000011575 calcium Substances 0.000 claims abstract description 15
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 15
- 239000006096 absorbing agent Substances 0.000 claims abstract description 11
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 229910052742 iron Inorganic materials 0.000 claims abstract description 9
- 238000009489 vacuum treatment Methods 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000002245 particle Substances 0.000 claims abstract description 4
- 239000011574 phosphorus Substances 0.000 claims abstract description 4
- 241000276489 Merlangius merlangus Species 0.000 claims 1
- 230000002745 absorbent Effects 0.000 claims 1
- 239000002250 absorbent Substances 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- YQCIWBXEVYWRCW-UHFFFAOYSA-N methane;sulfane Chemical compound C.S YQCIWBXEVYWRCW-UHFFFAOYSA-N 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910004261 CaF 2 Inorganic materials 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910001309 Ferromolybdenum Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- YYRMJZQKEFZXMX-UHFFFAOYSA-N calcium;phosphoric acid Chemical compound [Ca+2].OP(O)(O)=O.OP(O)(O)=O YYRMJZQKEFZXMX-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000002426 superphosphate Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a production method of ultra-low sulfur-resistant pipeline steel, which comprises the working procedures of converter smelting, LF refining, VD vacuum treatment and continuous casting; the converter smelting process comprises the following steps: the S content of the molten iron fed into the furnace is less than or equal to 0.020wt%; the tapping temperature of the converter is 1580-1620 ℃, the tapping carbon is more than or equal to 0.06wt%, the tapping phosphorus is less than or equal to 0.008wt%, the tapping sulfur is less than or equal to 0.025wt%, and 8-10 kg/t of low-titanium refined slag and 7-8 kg/t of lime are added in the tapping process; the LF refining process comprises the following steps: adding lime 10-13 kg/ton steel, low titanium refining slag 14-23 kg/ton steel and aluminum particles 0.4-0.5 kg/ton steel in the refining process; feeding pure calcium wire at the speed of 0.06-0.07 kg/t after refining and electrifying for 10-15 minutes; the continuous casting process comprises the following steps: the continuous casting tundish uses a high-alkalinity slag absorbing agent to replace a common carbon-free covering agent. The method reduces the sulfur content of molten iron in the early stage of smelting, selects steel-related raw materials for optimization during smelting, and controls the sulfur content of a second sample of molten steel in a refining position to be below 0.003 percent by adjusting the requirements on the sulfur content of the molten iron and the addition of tapping lime and refining slag.
Description
Technical Field
The invention relates to a smelting method, in particular to a production method of ultra-low sulfur-resistant pipeline steel.
Background
With the economic and social discovery, the quality requirements of the steel for the oil and natural gas transmission pipelines are gradually improved, and the demand of the Hydrogen Induced Cracking (HIC) resistant pipeline steel which is suitable for complex environment, humid environment and acidic environment is increasingly increased. Good HIC (hydrogen induced cracking) resistant and Sulfur Stress Crack (SSC) resistant steel is required to have good toughness, fatigue resistance and fracture resistance, and the sulfur content in molten steel is required to be less than or equal to 0.001%; therefore, stable and effective desulfurization in the production process is required.
Disclosure of Invention
The invention aims to solve the technical problem of providing a production method of ultra-low sulfur-resistant pipeline steel capable of effectively reducing the sulfur content of a finished product.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the method comprises the working procedures of converter smelting, LF refining, VD vacuum treatment and continuous casting;
the converter smelting process comprises the following steps: the S content of the molten iron fed into the furnace is less than or equal to 0.020wt%; the tapping temperature of the converter is 1580-1620 ℃, the tapping carbon is more than or equal to 0.06wt%, the tapping phosphorus is less than or equal to 0.008wt%, the tapping sulfur is less than or equal to 0.025wt%, and 8-10 kg/t of low-titanium refined slag and 7-8 kg/t of lime are added in the tapping process;
the LF refining process comprises the following steps: adding lime 10-13 kg/ton steel, low titanium refining slag 14-23 kg/ton steel and aluminum particles 0.4-0.5 kg/ton steel in the refining process; feeding pure calcium wire at a rate of 0.06-0.07 kg/t steel after refining and energizing for 10-15 minutes;
the continuous casting process comprises the following steps: the continuous casting tundish uses a high-alkalinity slag absorbing agent to replace a common carbon-free covering agent.
Further, in the converter smelting process, S in the lime is less than or equal to 0.030wt%, and S in the low-titanium refining slag is less than or equal to 0.035wt%.
Further, in the LF refining process, the slag pouring amount is more than or equal to 3 tons before the VD is added.
Further, the VD vacuum treatment comprises the following steps: VD vacuum time is more than or equal to 23min, and VD holding time is more than or equal to 12min; after the first furnace VD is broken to be empty, the adding amount of the calcium wire is 0.13-0.17 kg/ton steel, the adding amount of the calcium wire of the continuous casting furnace is 0.04-0.08 kg/ton, after the calcium wire is fed, the high-alkalinity slag absorbing agent is added according to 0.4-0.7 kg/ton steel, and then the covering agent of the ladle is added.
Furthermore, in the continuous casting process, S in the high-alkalinity slag-absorbing agent is less than or equal to 0.064wt%.
Furthermore, the continuous casting process adopts a heavy calcium stopper.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: by reducing the sulfur content of molten iron in the early stage of smelting, selecting steel-related raw and auxiliary materials for optimization during smelting, and adjusting the requirements on the sulfur content of the molten iron and the addition of tapping lime and refining slag, the sulfur content of a second sample of molten steel in a refining position is controlled to be below 0.003 percent, so that a good foundation is laid for deep desulfurization of a later LF refining furnace; performing intensified deoxidation at the early stage of LF refining, and performing a deep desulfurization process in a high-alkalinity large-slag-quantity strong stirring dual smelting mode after the temperature is raised; the continuous casting uses a high-alkalinity covering agent to prevent resulfurization, and uses a heavy calcium stopper to produce a finished product S meeting the requirements: 0.0008 to 0.001 percent of ultra-low sulfur pipeline steel.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
Examples 1 to 9: the production method of the ultra-low sulfur-resistant pipeline steel sequentially adopts the working procedures of raw material preparation, converter smelting, LF refining, VD vacuum treatment and continuous casting; the process of each procedure is as follows:
(1) A raw material preparation process: the charging of steel materials such as high S iron blocks is forbidden. The ladle adopts double air bricks. The ladle is required to be well baked without residual steel and residues, and the ladle edge residues must be thoroughly cleaned.
(2) A converter smelting process: the S content of the molten iron fed into the furnace is less than or equal to 0.020wt%; the tapping temperature of the converter is 1580-1620 ℃, the tapping carbon is more than or equal to 0.06wt%, the tapping phosphorus is less than or equal to 0.008wt%, and the tapping sulfur is less than or equal to 0.025wt%; during the converter tapping process, ferromolybdenum and low-titanium refining slag are added firstly, and then lime is added, wherein the adding amount of the low-titanium refining slag is 8-10 kg/t, the adding amount of the lime is 7-8 kg/t, the S content in the lime is less than or equal to 0.030wt%, and the S content in the low-titanium refining slag is less than or equal to 0.035wt%; the low-titanium refining slag comprises the following main components in percentage by weight: 48 to 55 percent of Cao and SiO 2 ≤6.0%、Al 2 O 3 34%～42%、TiO 2 ≤0.03%、B≤0.05%、CaF 2 Not more than 5.0 percent, 3.0 to 8.0 percent of MgO, not more than 0.3 percent of P and not more than 0.3 percent of S. The smelting process parameters of the converter in each embodiment are shown in a table 1; the main components of the low titanium slag are shown in Table 3 below.
Table 1: converter smelting process parameters
(3) An LF refining procedure: after the molten steel reaches a refining position, adding lime 10-13 kg/ton steel, low-titanium refining slag 14-23 kg/ton steel and aluminum particles 0.4-0.5 kg/ton steel, wherein S in the lime is less than or equal to 0.030wt%, and S in the lime is lowS in the titanium refining slag is less than or equal to 0.035wt%; feeding pure calcium wire at a rate of 0.06-0.07 kg/t steel after refining and energizing for 10-15 minutes; performing intensified deoxidation at the early stage of refining, and performing a deep desulfurization process in a high-alkalinity large-slag-quantity strong stirring dual smelting mode after the temperature is raised; the slag pouring amount is more than or equal to 3 tons before VD is added. The low-titanium refining slag comprises the following main components in percentage by weight: 48 to 55 percent of Cao and SiO 2 ≤6.0%、Al 2 O 3 34%～42%、TiO 2 ≤0.03%、B≤0.05%、CaF 2 Not more than 5.0 percent, 3.0 to 8.0 percent of MgO, not more than 0.3 percent of P and not more than 0.3 percent of S. The LF refining process parameters of each example are shown in a table 2, and the main components of the low-titanium refining slag of each example are shown in a table 3.
Table 2: LF refining process parameters
In table 2, the power feeding time refers to the power feeding time at the sampling interval of the refining process.
Table 3: main component (wt%) of low-titanium refining slag
(4) VD vacuum treatment: VD vacuum time is more than or equal to 23min, and VD holding time is more than or equal to 12min; after the first furnace VD is empty, the adding amount of the calcium line is 0.13-0.17 kg/ton steel, the adding amount of the calcium line of the continuous casting furnace is 0.04-0.08 kg/ton steel, after the calcium line is fed, the high-alkalinity slag-absorbing agent is added according to 0.4-0.7 kg/ton steel, and then the pre-melted covering agent for the steel ladle is added according to 1.2-1.5 kg/ton steel. The VD process parameters for each example are shown in Table 4.
Table 4: VD vacuum treatment process parameters
(5) And (3) continuous casting process: the S in the coating material of the tundish is less than or equal to 0.061wt%. The continuous casting tundish covering agent uses a high-alkalinity slag absorbing agent to replace a conventional carbon-free covering agent, the adding amount is 0.07-0.09 kg/t ton steel, and the high-alkalinity tundish covering agent is added according to 1.0-2.0 kg/t steel after the high-alkalinity slag absorbing agent is added; s in the high-alkalinity slag-absorbing agent is less than or equal to 0.064wt%, the alkalinity in the high-alkalinity slag-absorbing agent is 10-20, and S in the high-alkalinity tundish covering agent is less than or equal to 0.181wt%; three major pieces of continuous casting use anti-erosion triple superphosphate stopper rods. Continuously casting round billet with the diameter of 600mm at the continuous casting speed of 0.22-0.24 m/min; the degree of superheat of the casting heat of the tundish is 45-55 ℃, the degree of superheat of the second casting heat is 20-45 ℃, and the degree of superheat of the continuous casting heat is 25-35 ℃. The continuous casting process parameters of each example are shown in Table 5.
Table 5: parameters of continuous casting process
(6) The sulfur-resistant pipeline steel comprises the following chemical components in percentage by weight: 0.24 to 0.28 percent of C, 0.15 to 0.35 percent of Si, 0.45 to 0.55 percent of Mn, less than or equal to 0.012 percent of P, less than or equal to 0.0015 percent of S, 0.010 to 0.040 percent of TAl, 0.45 to 0.55 percent of Cr, 0.70 to 0.80 percent of Mo, 0.09 to 0.11 percent of V, 0.010 to 0.025 percent of Ti, 0.02 to 0.04 percent of Nb, 0.002 to 0.0035 percent of B, and the balance of Fe and inevitable impurities; the chemical compositions of the sulfur-resistant pipeline steel obtained in each example are shown in Table 5;
table 5: chemical composition (wt%) of sulfur-resistant pipeline steel
(7) The power of the sulfur-resistant pipeline steel is cut off after LF smelting is carried out for 20-30 minutes, and the sample is taken 1 after argon stirring is carried out for 3 minutes; powering off and sampling 2 after the smelting is carried out for 10-12 minutes again, and analyzing the content of S by using a carbon-sulfur instrument; powering off and sampling 3 after 9-10 minutes of secondary power transmission smelting, and analyzing the content of S by using a carbon-sulfur instrument; and (4) after the VD is broken, taking a broken sample, and analyzing the S content by using a carbon sulfur instrument. The results of the process sulfur and finished sulfur tests for each example are shown in table 6.
Table 6: results of Process and finished Sulfur tests (wt%)
Remarking: in table 6 above, the S content of sample 1 is the result of spectrometer analysis, and the S contents of sample 2, sample 3, the broken blank and the finished product are the result of carbon sulfur instrument (CS) analysis.
Claims (6)
1. A production method of ultra-low sulfur-resistant pipeline steel is characterized by comprising the following steps: the method comprises the working procedures of converter smelting, LF refining, VD vacuum treatment and continuous casting;
the converter smelting process comprises the following steps: the S content of the molten iron fed into the furnace is less than or equal to 0.020wt%; the tapping temperature of the converter is 1580-1620 ℃, the tapping carbon is more than or equal to 0.06wt%, the tapping phosphorus is less than or equal to 0.008wt%, the tapping sulfur is less than or equal to 0.025wt%, and 8-10 kg/t of low-titanium refined slag and 7-8 kg/t of lime are added in the tapping process;
the LF refining process comprises the following steps: adding lime 10-13 kg/ton steel, low titanium refining slag 14-23 kg/ton steel and aluminum particles 0.4-0.5 kg/ton steel in the refining process; feeding pure calcium wire at a rate of 0.06-0.07 kg/t steel after refining and energizing for 10-15 minutes;
the continuous casting process comprises the following steps: the continuous casting tundish uses a high-alkalinity slag absorbing agent to replace a common carbon-free covering agent.
2. The method for producing ultra-low sulfur-resistant pipeline steel according to claim 1, wherein: in the converter smelting process, the S content in the lime is less than or equal to 0.030wt%, and the S content in the low-titanium refining slag is less than or equal to 0.035wt%.
3. The method for producing ultra-low sulfur-resistant pipeline steel according to claim 1, wherein: in the LF refining process, the slag pouring amount is more than or equal to 3 tons before VD feeding.
4. The method for producing ultra-low sulfur-resistant pipeline steel according to claim 1, wherein: and (3) VD vacuum treatment: VD vacuum time is more than or equal to 23min, and VD holding time is more than or equal to 12min; after the first furnace VD is broken to be empty, the adding amount of the calcium wire is 0.13-0.17 kg/ton steel, the adding amount of the calcium wire of the continuous casting furnace is 0.04-0.08 kg/ton, after the calcium wire is fed, the high-alkalinity slag absorbing agent is added according to 0.4-0.7 kg/ton steel, and then the covering agent of the ladle is added.
5. The method for producing ultra-low sulfur-resistant pipeline steel according to claim 1, wherein: in the continuous casting process, S in the high-alkalinity slag absorbent is less than or equal to 0.064wt%.
6. The method for producing an ultra low sulfur resistant pipeline steel according to any one of claims 1 to 5, wherein: in the continuous casting process, a coarse whiting stopper rod is adopted.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211286623.0A CN115679184A (en) | 2022-10-20 | 2022-10-20 | Production method of ultra-low-sulfur-resistant pipeline steel |
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| CN202211286623.0A CN115679184A (en) | 2022-10-20 | 2022-10-20 | Production method of ultra-low-sulfur-resistant pipeline steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534120A (en) * | 2012-02-29 | 2012-07-04 | 首钢总公司 | Smelting process for production of super-low sulphur steel |
| CN103898269A (en) * | 2014-04-02 | 2014-07-02 | 南京钢铁股份有限公司 | Ultralow sulfur steel quick smelting method |
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| CN108893683A (en) * | 2018-08-01 | 2018-11-27 | 石钢京诚装备技术有限公司 | A kind of sulfur resistive pipe line steel and its production method |
| CN109355461A (en) * | 2018-11-13 | 2019-02-19 | 石钢京诚装备技术有限公司 | The production method of ultralow-sulfur steel in the case of a kind of iron-free water pretreatment |
| CN109628820A (en) * | 2019-01-10 | 2019-04-16 | 石钢京诚装备技术有限公司 | A kind of low-phosphorous, low-sulfur sulfur resistive pipe line steel continuous cast round billets production method |
| CN110055450A (en) * | 2019-04-18 | 2019-07-26 | 石钢京诚装备技术有限公司 | A kind of smelting process of non-hardened and tempered steel |
| CN110373600A (en) * | 2019-07-26 | 2019-10-25 | 石钢京诚装备技术有限公司 | A kind of high alumina sulfur-bearing control calcium steel smelting process |
| CN110669895A (en) * | 2019-10-08 | 2020-01-10 | 石家庄钢铁有限责任公司 | Smelting method of low-oxygen sulfur-containing steel |
| CN112126746A (en) * | 2020-08-17 | 2020-12-25 | 石钢京诚装备技术有限公司 | anti-H2Smelting method of S corrosion ultra-low sulfur steel |
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2022
- 2022-10-20 CN CN202211286623.0A patent/CN115679184A/en not_active Withdrawn
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534120A (en) * | 2012-02-29 | 2012-07-04 | 首钢总公司 | Smelting process for production of super-low sulphur steel |
| CN103898269A (en) * | 2014-04-02 | 2014-07-02 | 南京钢铁股份有限公司 | Ultralow sulfur steel quick smelting method |
| CN106011377A (en) * | 2015-10-20 | 2016-10-12 | 南京钢铁股份有限公司 | Control technology for B-class inclusions of low-carbon low-sulfur pipeline steel |
| CN108893683A (en) * | 2018-08-01 | 2018-11-27 | 石钢京诚装备技术有限公司 | A kind of sulfur resistive pipe line steel and its production method |
| CN109355461A (en) * | 2018-11-13 | 2019-02-19 | 石钢京诚装备技术有限公司 | The production method of ultralow-sulfur steel in the case of a kind of iron-free water pretreatment |
| CN109628820A (en) * | 2019-01-10 | 2019-04-16 | 石钢京诚装备技术有限公司 | A kind of low-phosphorous, low-sulfur sulfur resistive pipe line steel continuous cast round billets production method |
| CN110055450A (en) * | 2019-04-18 | 2019-07-26 | 石钢京诚装备技术有限公司 | A kind of smelting process of non-hardened and tempered steel |
| CN110373600A (en) * | 2019-07-26 | 2019-10-25 | 石钢京诚装备技术有限公司 | A kind of high alumina sulfur-bearing control calcium steel smelting process |
| CN110669895A (en) * | 2019-10-08 | 2020-01-10 | 石家庄钢铁有限责任公司 | Smelting method of low-oxygen sulfur-containing steel |
| CN112126746A (en) * | 2020-08-17 | 2020-12-25 | 石钢京诚装备技术有限公司 | anti-H2Smelting method of S corrosion ultra-low sulfur steel |
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