CN114632816A - Heating and rolling method of industrial pure iron - Google Patents
Heating and rolling method of industrial pure iron Download PDFInfo
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- CN114632816A CN114632816A CN202210152113.8A CN202210152113A CN114632816A CN 114632816 A CN114632816 A CN 114632816A CN 202210152113 A CN202210152113 A CN 202210152113A CN 114632816 A CN114632816 A CN 114632816A
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- heating
- equal
- pure iron
- industrial pure
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 238000005096 rolling process Methods 0.000 title claims abstract description 52
- 238000010438 heat treatment Methods 0.000 title claims abstract description 51
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000009749 continuous casting Methods 0.000 claims abstract description 32
- 238000002791 soaking Methods 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 27
- 239000010959 steel Substances 0.000 claims description 27
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000005336 cracking Methods 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 14
- 238000012797 qualification Methods 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910001240 Maraging steel Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
-
- 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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- 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
-
- 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
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
Abstract
The invention discloses a heating and rolling method of industrial pure iron, which comprises the steps of heating a continuous casting billet and rolling the heated continuous casting billet, wherein the heating of the continuous casting billet comprises the following steps: the preheating section is 790-840 ℃, and the preheating time is more than or equal to 40 min; heating the second section to 900-1050 ℃, heating the first section to 1000-1100 ℃, and heating the total time to be more than or equal to 80 min; the soaking section is 1020-1080 ℃, and the soaking time is more than or equal to 35 min; the heated continuous casting billet is rolled by a phi 850 cogging mill and a phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit, wherein the cogging temperature of the phi 850mm cogging mill is controlled to be 910-980 ℃, the cogging temperature of the phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit is controlled to be 780-880 ℃, and the finishing temperature is controlled to be 620-700 ℃. The method provided by the invention can control the surface crack rate of the industrial pure iron within 2%.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a heating and rolling method of industrial pure iron.
Background
Pure iron is an iron alloy with very low carbon content and has the excellent performances of low coercive force, good heat conduction and electromagnetic properties, soft texture, high toughness and the like. The pure iron which is industrially produced and applied at present is also called industrial pure iron, and the purity is 99.6-99.8%. The industrial pure iron is an important steel base material and is mainly used for smelting aerospace, military and civil alloys or steel products such as various high-temperature alloys, heat-resistant alloys, precision alloys, maraging steel and the like.
Surface cracks of round steel and angle cracks of flat steel are always common main problems in pure iron production.
The heating system and the rolling process of pure iron directly influence the quality of products, the poor matching of the heating system and the rolling process can cause surface cracks of the products, particularly square steel is more serious, corners are generally under the action of tensile force generated by shrinkage of steel shells on two sides, and when the cooling strength of the corners is low and the strength of the steel shells on the corners is low, the corners cannot bear the tensile force generated by shrinkage of the steel shells on two sides, cracks can be generated on the corners, and the surface cracks are formed in the same round steel rolling process. Although the steel grade of the pure iron has good plasticity, when the heating system and the rolling process are inappropriate, the surface quality is cracked, and the product percent of pass is reduced, so the heating system and the rolling process of the pure iron are the key points for ensuring the product quality.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a heating and rolling method of industrial pure iron, wherein the industrial pure iron comprises the following chemical components in percentage by mass: less than or equal to 0.0080 percent of C, less than or equal to 0.020 percent of Si, less than or equal to 0.06 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.030 percent of Al, less than or equal to 2.0ppm of [ H ], lessthan or equal to 20ppm of [ O ], lessthan or equal to 60ppm of [ N ], and the balance of Fe and inevitable impurities;
the heating and rolling method of the industrial pure iron comprises the following steps: heating of a continuous casting slab and rolling of the heated continuous casting slab, wherein:
the heating of the continuous casting slab comprises: the preheating section is 790-840 ℃, and the preheating time is more than or equal to 40 min; heating the second section to 900-1050 ℃, heating the first section to 1000-1100 ℃, and heating the total time to be more than or equal to 80 min; the soaking section is 1020-1080 ℃, and the soaking time is more than or equal to 35 min;
the heated continuous casting blank is rolled by a phi 850 cogging mill and a phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit, wherein the cogging temperature of the phi 850mm cogging mill is controlled to be 910-980 ℃, the cogging temperature of the phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit is controlled to be 780-880 ℃, and the finish rolling temperature is controlled to be 620-700 ℃.
In the method, the production process of the continuous casting slab comprises the following steps: blast furnace molten iron-molten iron pretreatment-converter top and bottom combined blowing smelting-LF external refining-RH vacuum treatment-continuous casting.
In the method, the crack rate of the industrial pure iron is controlled within 2 percent, and the quality qualified rate of products reaches more than 98 percent.
In the method, the industrial pure iron is hot-rolled flat steel or hot-rolled round steel.
The heating and rolling method for the industrial pure iron based on the technical scheme adopts a proper heating system and a proper rolling process, can effectively inhibit the generation of surface cracks of the produced industrial pure iron, enables the crack rate to be controlled within 2 percent, and enables the product quality qualification rate to reach more than 98 percent.
Detailed Description
The invention aims to provide a heating and rolling method capable of ensuring the surface quality (the crack rate can be controlled within 2 percent and the quality qualification rate can reach more than 98 percent) of industrial pure iron (such as hot rolled round steel or flat steel), and specifically comprises the following steps:
the industrial pure iron comprises the following chemical components in percentage by mass: less than or equal to 0.0080 percent of C, less than or equal to 0.020 percent of Si, less than or equal to 0.06 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.030 percent of Al, less than or equal to 2.0ppm of [ H ], lessthan or equal to 20ppm of [ O ], lessthan or equal to 60ppm of [ N ], and the balance of Fe and inevitable impurities;
the heating and rolling method of the industrial pure iron comprises the following steps: heating of a continuous casting slab and rolling of the heated continuous casting slab, wherein:
the heating of the continuous casting slab comprises: the preheating section is 790-840 ℃, and the preheating time is more than or equal to 40 min; heating the second section to 900-1050 ℃, heating the first section to 1000-1100 ℃, and heating the total time to be more than or equal to 80 min; the soaking section is 1020-1080 ℃, and the soaking time is more than or equal to 35 min;
the heated continuous casting blank is rolled by a phi 850 cogging mill and a phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit, wherein the cogging temperature of the phi 850mm cogging mill is controlled to be 910-980 ℃, the cogging temperature of the phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit is controlled to be 780-880 ℃, and the finish rolling temperature is controlled to be 620-700 ℃.
In the method, the production process of the continuous casting slab comprises the following steps: blast furnace molten iron-molten iron pretreatment-converter top and bottom combined blowing smelting-LF external refining-RH vacuum treatment-continuous casting.
In the method, the crack rate of the industrial pure iron is controlled within 2 percent, and the quality qualified rate of products reaches more than 98 percent.
The present invention is described in more detail below with reference to examples. These examples are merely illustrative of the best mode of carrying out the invention and do not limit the scope of the invention in any way.
Example 1
The embodiment takes the production of industrial pure iron hot-rolled flat steel as an example, and the steel is obtained by cutting and rolling a continuous casting billet. The production of the continuous casting billet can be achieved according to the conventional production process of industrial pure iron, and comprises the following process steps: blast furnace molten iron-molten iron pretreatment-converter top and bottom combined blowing smelting-LF external refining-RH vacuum treatment-continuous casting; the molten iron for continuous casting comprises the following chemical components (by mass percent): less than or equal to 0.0080 percent of C, less than or equal to 0.020 percent of Si, less than or equal to 0.06 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.030 percent of Al, less than or equal to 2.0ppm of [ H ], less than or equal to 20ppm of [ O ], less than or equal to 60ppm of [ N ], and the balance of Fe and inevitable impurities.
The process for producing the industrial pure iron hot-rolled flat steel by using the continuous casting billet comprises the following steps: heating a continuous casting billet, removing phosphorus by high-pressure water, rolling by a phi 850mm cogging mill, a phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit, sawing (sampling), and stacking (cooling and heat collecting). The heating system of the continuous casting blank is shown in the following table 1, the rolling process of the continuous rolling mill with the diameter of 850mm, the diameter of 700mm multiplied by 3 and the diameter of 550mm multiplied by 4 is shown in the following table 2, and the specification, the surface crack rate and the quality percent of pass of the obtained industrial pure iron hot rolling flat steel are shown in the following table 3.
Examples 2 to 6
Examples 2-6 an industrial pure iron hot-rolled flat steel was produced according to the process steps of example 1, except that: the heating system and the rolling process of the continuous casting billet are different, the specific heating system and the rolling process conditions are shown in the following tables 1 and 2, and the specification, the surface crack rate and the quality qualification rate of the industrial pure iron hot-rolled flat steel obtained by production are shown in the following table 3.
Examples 7 to 9
Examples 7-9 were carried out according to the process steps of example 1, except that: the industrial pure iron hot-rolled round steel is produced by cutting and rolling a continuous casting billet, the heating system and the rolling process of the continuous casting billet are different, the specific heating system and the rolling process conditions are shown in the following tables 1 and 2, and the specification, the surface crack rate and the quality qualification rate of the industrial pure iron hot-rolled round steel are shown in the following table 3.
Comparative examples 1 to 8
Comparative examples 1-8 an industrial pure iron hot-rolled flat steel was produced according to the process steps of example 1, except that: the heating system and/or the rolling process of the continuous casting billet are different, the specific heating system and the rolling process conditions are shown in the following tables 1 and 2, and the specification, the surface crack rate and the quality qualification rate of the industrial pure iron hot-rolled flat steel obtained by production are shown in the following table 3.
Table 1: heating schedules of examples 1-9 and comparative examples 1-8
Table 2: rolling process of examples 1 to 9 and comparative examples 1 to 8
Table 3: specifications, surface crack rates and quality yields of the industrial pure iron produced in examples 1 to 9 and comparative examples 1 to 8
| Examples | Specification of | Rate of surface cracking | Percent of pass |
| Example 1 | 50*100mm | 2％ | 98％ |
| Example 2 | 50*100mm | 2％ | 98％ |
| Example 3 | 160*230mm | 1％ | 99％ |
| Example 4 | 160*230mm | 2％ | 98％ |
| Example 5 | 50*100mm | 0％ | 100％ |
| Example 6 | 50*100mm | 1％ | 99％ |
| Example 7 | Φ50mm | 1％ | 99％ |
| Example 8 | Φ100mm | 2％ | 98％ |
| Example 9 | Φ150mm | 2％ | 98％ |
| Comparative example 1 | 50*100mm | 6％ | 94％ |
| Comparative example 2 | 50*100mm | 6％ | 94％ |
| Comparative example 3 | 160*230mm | 7％ | 93％ |
| Comparative example 4 | 160*230mm | 8％ | 92％ |
| Comparative example 5 | 50*100mm | 4％ | 96％ |
| Comparative example 6 | 50*100mm | 3％ | 97％ |
| Comparative example 7 | 160*230mm | 5％ | 95％ |
| Comparative example 8 | 160*230mm | 4％ | 96％ |
From the results described in tables 1 to 3 above, it is understood that the heating schedule and rolling process of the industrial pure iron directly affect the quality (e.g., surface crack rate) of the product, and the heating schedule and rolling process of examples 1 to 9 are more advantageous to produce the industrial pure iron with good surface quality than the heating schedule and rolling process of comparative examples 1 to 8, the surface crack rate can be controlled within 2%, and the yield of the product can be more than 98%.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. The heating and rolling method of the industrial pure iron is characterized in that the industrial pure iron comprises the following chemical components in percentage by mass: less than or equal to 0.0080 percent of C, less than or equal to 0.020 percent of Si, less than or equal to 0.06 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.010 percent of S, less than or equal to 0.030 percent of Al, less than or equal to 2.0ppm of [ H ], lessthan or equal to 20ppm of [ O ], lessthan or equal to 60ppm of [ N ], and the balance of Fe and inevitable impurities;
the heating and rolling method of the industrial pure iron comprises the following steps: heating of a continuous casting slab and rolling of the heated continuous casting slab, wherein:
the heating of the continuous casting slab comprises: the preheating section is 790-840 ℃, and the preheating time is more than or equal to 40 min; heating the second section to 900-1050 ℃, heating the first section to 1000-1100 ℃, and heating the total time to be more than or equal to 80 min; the soaking section is 1020-1080 ℃, and the soaking time is more than or equal to 35 min;
the heated continuous casting blank is rolled by a phi 850 cogging mill and a phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit, wherein the cogging temperature of the phi 850mm cogging mill is controlled to be 910-980 ℃, the cogging temperature of the phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit is controlled to be 780-880 ℃, and the finish rolling temperature is controlled to be 620-700 ℃.
2. The heating and rolling method of industrial pure iron as claimed in claim 1, wherein the production process of the continuous cast slab comprises the steps of: blast furnace molten iron-molten iron pretreatment-converter top and bottom combined blown smelting-LF external refining-RH vacuum treatment-continuous casting.
3. The heating and rolling method of industrial pure iron according to claim 1 or 2, wherein the cracking rate of industrial pure iron is controlled within 2%, and the quality yield of the product is 98% or more.
4. The heating and rolling method of industrial pure iron according to claim 1 or 2, wherein the industrial pure iron is hot-rolled flat steel or hot-rolled round steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210152113.8A CN114632816B (en) | 2022-02-18 | 2022-02-18 | Heating and rolling method for industrial pure iron |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210152113.8A CN114632816B (en) | 2022-02-18 | 2022-02-18 | Heating and rolling method for industrial pure iron |
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| Publication Number | Publication Date |
|---|---|
| CN114632816A true CN114632816A (en) | 2022-06-17 |
| CN114632816B CN114632816B (en) | 2024-02-23 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104264053A (en) * | 2014-08-29 | 2015-01-07 | 武汉钢铁(集团)公司 | Production method of raw material pure iron rod for NdFeB (neodymium iron boron) |
| CN105331769A (en) * | 2015-09-29 | 2016-02-17 | 邢台钢铁有限责任公司 | Deep-drawing pure iron for high-strength fastening piece and production method of deep-drawing pure iron |
| CN109207709A (en) * | 2018-09-26 | 2019-01-15 | 山西太钢不锈钢股份有限公司 | A kind of heating means of blooming mill rolling pure iron band steel |
| CN109825763A (en) * | 2019-01-23 | 2019-05-31 | 邢台钢铁有限责任公司 | A kind of high conductivity cathode band steel ingot iron and its production method |
| CN112474792A (en) * | 2020-10-26 | 2021-03-12 | 邯郸钢铁集团有限责任公司 | Cogging rolling production method for industrial pure iron |
-
2022
- 2022-02-18 CN CN202210152113.8A patent/CN114632816B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104264053A (en) * | 2014-08-29 | 2015-01-07 | 武汉钢铁(集团)公司 | Production method of raw material pure iron rod for NdFeB (neodymium iron boron) |
| CN105331769A (en) * | 2015-09-29 | 2016-02-17 | 邢台钢铁有限责任公司 | Deep-drawing pure iron for high-strength fastening piece and production method of deep-drawing pure iron |
| CN109207709A (en) * | 2018-09-26 | 2019-01-15 | 山西太钢不锈钢股份有限公司 | A kind of heating means of blooming mill rolling pure iron band steel |
| CN109825763A (en) * | 2019-01-23 | 2019-05-31 | 邢台钢铁有限责任公司 | A kind of high conductivity cathode band steel ingot iron and its production method |
| CN112474792A (en) * | 2020-10-26 | 2021-03-12 | 邯郸钢铁集团有限责任公司 | Cogging rolling production method for industrial pure iron |
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