CN113564449A - Semi-steel smelting method of phosphorus-containing high-strength IF steel - Google Patents
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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%
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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Abstract
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a semi-steel smelting method of phosphorus-containing high-strength IF steel. The invention aims to provide a semisteel smelting method of phosphorus-containing high-strength IF steel. The method comprises the following steps: a. smelting in a converter: primarily smelting the semi-steel into molten steel, and tapping when the P content in the molten steel is 0.010-0.020% and the C content is 0.03-0.05%; b. LF refining: adding a submerged arc slagging agent into LF heating, and taking out of the furnace at 1625-1635 ℃; c. RH refining: carrying out decarburization and deoxidation on molten steel after LF refining, and then carrying out alloying treatment; d. and (3) continuously casting the molten steel into a blank after RH refining. The phosphorus-containing high-strength IF steel obtained by the invention has the advantages that the smelting yield is increased from 92% to 99.5%, and the steel quality is obviously improved.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy, and particularly relates to a semi-steel smelting method of phosphorus-containing high-strength IF steel.
Background
The development of ultra-low carbon steel by foreign steel mills, such as automobile plates, is earlier. Through years of research, a whole set of production management system and production process are formed. The external refining of China starts later than that of developed countries abroad, and a certain gap exists in product quality, but the gap is smaller and smaller through continuous innovation of equipment technology in recent years. In the production process and quality control of ultra-low carbon steel, domestic steel reaches the top-grade level of the world, and other steel mills are continuously followed.
With the increasing requirements on environmental protection and cost reduction, the quality requirement of the automobile steel is higher and higher in order to meet the requirements on weight reduction, material consumption reduction and fuel oil saving of the automobile. The phosphorus-added high-strength IF steel belongs to high-strength IF steel, has ultra-deep drawability and higher strength, is mainly used for manufacturing relatively complex structural parts in an automobile, such as a car extension bracket, a suspension mounting beam, a steering engine mounting support beam, a covering part, a reinforcing plate and the like, and is favorable for meeting the development requirements of light weight and high reinforcement of the automobile. At present, high-strength IF steel is widely used for middle-high-end automobiles to replace common IF steel, and the like, so that the market demand is large. The series of steel grades has high P content, contains a large amount of Mn, Si, Nb and Ti alloy elements, and has high production difficulty.
The current patent CN202010447792.2 discloses a method for improving the P solid solution amount of phosphorus-containing high-strength IF steel by rare earth treatment, which comprises the following steps: and at the final stage of RH refining process treatment, adding the alloy in the RH vacuum treatment process, and adding the rare earth cerium-iron alloy when the circulation is carried out for 5min after the alloying is finished, so that the Ce content of the molten steel reaches 18 ppm. The rare earth elements are added, so that the cost is high; oxides formed by rare earth elements are likely to be aggregated into large-sized inclusions, which cause adverse effects on the cleanliness of molten steel.
Patent CN201811504307.X discloses a phosphorus-containing high-strength IF steel and a method for eliminating surface pockmark defects thereof. The phosphorus-containing high-strength IF steel comprises the following steel grades in percentage by chemical mass: 0.0060-0.0080 wt% of C, 0.10-0.20 wt% of Si, 1.1-1.20 wt% of Mn, 0.075-0.095 wt% of P, less than or equal to 0.012 wt% of S, 0.025-0.050 wt% of Alt, 0.010-0.020 wt% of Nb, 0.050-0.070 wt% of Ti, 0.0004-0.0010 wt% of B, and less than or equal to 0.0040 wt% of N. The phosphorus-containing high-strength IF steel and the method for eliminating the surface pockmark defect can eliminate the surface pockmark of the continuous annealing product of the phosphorus-containing high-strength IF steel. However, in order to ensure the strength under the hot working condition, the component design with higher carbon content is adopted, which has certain adverse effect (toughness and the like) on the processing performance of the product and limits the application range of the product to a certain extent.
Patent CN201911068931.4 discloses a converter steelmaking method for producing low-sulfur phosphorus-containing IF steel by using an RH single-link process, which comprises the following steps: and optimizing a converter loading system, a slagging system, converter end point control and a deoxidation alloying system. But the converter is seriously eroded and blown to the converter due to high temperature 1730-1750 ℃ and high oxygen content; meanwhile, the high initial oxygen content increases the number of molten steel deoxidation products, namely inclusions, is unfavorable for controlling the cleanliness of molten steel, is particularly not suitable for manufacturers under semisteel conditions (insufficient heat source of a converter) and with long production line layout to adopt related measures, and is poor in popularization degree.
CN201410394368.0 discloses a preparation method of phosphorus-containing silicon-containing manganese-containing IF steel, which comprises the following steps: sequentially carrying out pre-desulfurization and slagging-off treatment on molten iron to obtain first molten iron; smelting the first molten iron by a dephosphorization converter to obtain semi-molten steel; and smelting the semi-molten steel in a decarburization furnace to obtain first molten steel. Or smelting the first molten iron by a conventional converter to obtain the first molten steel. The first molten steel is subjected to temperature regulation and decarburization in an RH furnace, and ferrophosphorus and micro-carbon ferromanganese are added; and then supplementing ferrophosphorus and micro-carbon ferromanganese in the first molten steel, adding ferrosilicon alloy, and conditioning the components of the first molten steel to obtain second molten steel with qualified carbon content and silicon-manganese-phosphorus content. And sending the second molten steel to a continuous casting process, injecting the second molten steel into a tundish, and casting the second molten steel to obtain an IF steel slab. However, the patent needs phosphorus alloying and dephosphorization in a dephosphorization converter, which increases the cost and can completely control phosphorus through the decarburization converter; meanwhile, the RH treatment time is reduced, the circulation time after vacuum alloying is only ensured to be more than 4min, and the short alloying circulation time is not favorable for the uniformity of alloy components and the floating of impurities according to practice and related literature reports.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a semisteel smelting method of phosphorus-containing high-strength IF steel, which comprises the following steps:
a. smelting in a converter: primarily smelting the semi-steel into molten steel, and tapping when the P content in the molten steel is 0.010-0.020% and the C content is 0.03-0.05%;
b. LF refining: adding a submerged arc slagging agent into LF heating, and taking out of the furnace at 1625-1635 ℃;
c. RH refining: carrying out decarburization and deoxidation on molten steel after LF refining, and then carrying out alloying treatment;
d. and (3) continuously casting the molten steel into a blank after RH refining.
In the step a of the semi-steel smelting method of the phosphorus-containing high-strength IF steel, the semi-steel comprises the following components: 3.20-3.80% of C, 0.03-0.06% of Mn, 0.050-0.080% of P, 0.0010-0.005% of S, 0.01-0.04% of V, trace amounts of Cr, Si and Ti, and the balance of iron and inevitable impurities.
In the step a of the semi-steel smelting method of the phosphorus-containing high-strength IF steel, S is less than or equal to 0.002 percent when a converter is charged.
In the step a of the semi-steel smelting method of the phosphorus-containing high-strength IF steel, a converter blowing process does not adopt a low-phosphorus steel blowing mode.
In the step a of the semi-steel smelting method of the phosphorus-containing high-strength IF steel, 550-650 kg/furnace of submerged arc slagging agent is added in the tapping process.
In the step b of the semi-steel smelting method of the phosphorus-containing high-strength IF steel, the addition amount of the submerged arc slagging agent added in LF heating is less than or equal to 5kg/t steel.
In the semi-steel smelting method of the phosphorus-containing high-strength IF steel, the submerged arc slagging agent is active lime.
In the step b of the semi-steel smelting method of the phosphorus-containing high-strength IF steel, 350-450 kg/furnace aluminum modifier is added to the slag surface after LF refining treatment is finished.
Wherein the aluminum modifier comprises 20-40% of CaO and Al2O310-30%, 38-42% of MAl, 2-4% of NaCl, less than or equal to 0.2% of S, less than or equal to 0.1% of P, and the balance of unavoidable impurities.
In the step C of the semi-steel smelting method of the phosphorus-containing high-strength IF steel, RH enters a station and is adjusted to a target value according to the oxygen determination condition IF the [ O ]/[ C ] value is not more than or equal to 1.6+ 0.1% at the initial stage of entering the station and vacuumizing.
In the step c of the semi-steel smelting method for the phosphorus-containing high-strength IF steel, molten steel is decarbonized for 8-10 min, and then metal manganese and ferrophosphorus are added, wherein the yield is controlled according to the neutral line components of 93-96% of metal manganese and 83-87% of ferrophosphorus.
In the step c of the semi-steel smelting method of the phosphorus-containing high-strength IF steel, decarburization treatment is carried out for 18-20 min, deoxidation and aluminum alloying are carried out, sampling and silicon alloying are carried out after circulation is carried out for 2-4 min, the alloy content is adjusted according to the sampling result, and the circulation time after total alloying is more than or equal to 8 min.
In the step c of the semi-steel smelting method of the phosphorus-containing high-strength IF steel, the molten steel stands for 15-25 min before leaving the station.
Wherein, in the step d of the semi-steel smelting method of the phosphorus-containing high-strength IF steel, the superheat degree of the molten tundish steel in continuous casting is 20-35 ℃.
In the step d of the semi-steel smelting method of the phosphorus-containing high-strength IF steel, the amount of the covering agent used in continuous casting is 0.5-0.8 kg/t steel.
In the step d of the semi-steel smelting method of the phosphorus-containing high-strength IF steel, the target drawing speed is as follows: 1.0-1.3 m/min, and adopting constant-speed pouring.
Has the advantages that: the invention controls the technological parameters of converter smelting, LF refining, RH refining and continuous casting to raise the smelting rate of the obtained high strength IF steel from 92% to 99.5%, and to lower the cleanliness from 25ppm to 20 ppm.
Detailed Description
The invention provides a semisteel smelting method of phosphorus-containing high-strength IF steel, which comprises the following steps: a. smelting in a converter: primarily smelting the semi-steel into molten steel, and tapping when the P content in the molten steel is 0.010-0.020% and the C content is 0.03-0.05%;
in the step a, the semisteel comprises the following components: 3.20-3.80% of C, 0.03-0.06% of Mn, 0.050-0.080% of P, 0.0010-0.005% of S, 0.01-0.04% of V, trace amounts of Cr, Si and Ti, and the balance of iron and inevitable impurities. The semisteel is vanadium extraction and desulfurization semisteel. And the cleanliness of the semisteel is well controlled.
Wherein in the step a, S is less than or equal to 0.002 percent when the converter is charged.
In the step a, the converter blowing process does not adopt a low-phosphorus steel blowing mode.
In the step a, 550-650 kg of submerged arc slagging agent is added in the tapping process.
b. LF refining: adding a submerged arc slagging agent into LF heating, and taking out of the furnace at 1625-1635 ℃;
in the step b, the adding amount of the submerged arc slagging agent added in the LF heating is less than or equal to 5kg/t steel.
Wherein the submerged arc slagging agent is active lime.
The submerged arc slagging agent is added in the steps a and b, so that the heating effect is ensured, and meanwhile, the composition of the steel slag is adjusted to promote the adsorption and removal of impurities.
In the step b, 350-450 kg/furnace aluminum modifier is added to the slag surface after LF refining treatment is finished.
Wherein the aluminum modifier comprises 20-40% of CaO and Al2O310-30%, 38-42% of MAl, 2-4% of NaCl, less than or equal to 0.2% of S, less than or equal to 0.1% of P, and the balance of unavoidable impurities. The aluminum modifier is not easy to agglomerate and has good modifying effect.
c. RH refining: carrying out decarburization and deoxidation on molten steel after LF refining, and then carrying out alloying treatment;
wherein, in step c, if the oxygen is insufficient to ensure the demand of deep decarburization oxygen, the decarburization effect cannot be achieved. Therefore, the RH station entering is adjusted to the target value at the initial stage of station entering vacuum-pumping if the [ O ]/[ C ] value is not more than 1.6+ 0.1% according to the oxygen determination condition.
In the step c, in order to reduce the influence of the alloy on decarburization, metal manganese and ferrophosphorus are added after molten steel is decarburized for 8-10 min, and the yield is controlled according to central line components of 93-96% of metal manganese and 83-87% of ferrophosphorus.
In the step c, after decarburization treatment is carried out for 18-20 min, deoxidation and aluminum alloying are carried out, sampling and silicon alloying are carried out after circulation is carried out for 2-4 min, the alloy content is adjusted according to the sampling result, and the circulation time after total alloying is more than or equal to 8 min.
And c, standing the molten steel for 15-25 min before the molten steel is taken out of the station.
d. And (3) continuously casting the molten steel into a blank after RH refining.
Wherein, in the step d, the superheat degree of the molten steel of the continuous casting tundish is 20-35 ℃.
Wherein, in the step d, the covering agent is coated in the continuous casting with the dosage of 0.5-0.8 kg/t steel.
In step d, the target pulling speed is as follows: 1.0-1.3 m/min, and adopting constant-speed pouring.
The finished steel obtained by the semisteel smelting method of the phosphorus-containing high-strength IF steel comprises the components of less than or equal to 0.0034 wt% of C, 0.09-0.12 wt% of Si, 0.30-0.40 wt% of Mn, 0.025-0.035 wt% of P, less than or equal to 0.012 wt% of S, 0.025-0.035 wt% of Nb, 0.030-0.040 wt% of Ti and 0.020-0.045 wt% of Als.
Example 1
The method comprises the following steps of taking semisteel which is subjected to vanadium extraction and desulfurization of vanadium and titanium containing iron as a raw material to carry out primary molten steel smelting, wherein the semisteel comprises the following components in percentage by weight: 3.41 percent of C, 0.041 percent of Mn, 0.062 percent of P, 0.0016 percent of S, 0.04 percent of V, trace amounts of Cr, Si and Ti, and the balance of iron and inevitable impurities.
The method comprises the following specific steps:
(1) 232.5 tons of the semi-steel are added into a top-bottom combined blowing converter with the capacity of 220 tons (nominal capacity), the semi-steel is primarily refined into molten steel by utilizing the function of oxygen blowing and decarburization of the top-bottom combined blowing converter, when the molten steel is primarily refined to the state that the C content is 0.038 wt%, the Mn content is 0.031 wt%, the P content is 0.020 wt%, the S content is 0.0041 wt% and the temperature is 1671 ℃, thick slag is started, and steel is discharged into a ladle.
(2) 630kg of active lime is added in the tapping process;
(3) 3kg/t of lime is added in the LF heating process, the outbound temperature is 1632 ℃, and 350kg of aluminum modifier is added in the outbound process;
(4) RH station entering meets the condition that the value of [ O ]/[ C ] is more than or equal to 1.6+ 0.1% according to the oxygen determination of 612ppm and the carbon of 0.032 percent, and oxygen supplement operation is not carried out;
(5) adding metal manganese and ferrophosphorus into the RH decarburization for 8min, wherein the yield is controlled according to the neutral line components of 95% of metal manganese and 85% of ferrophosphorus;
(6) performing RH decarburization treatment for 18min for deoxidation and aluminum alloying, sampling and silicon alloying after circulating for 3min, adjusting the content of alloys such as phosphorus and manganese according to the sampling result, and circulating for 9min after total alloying;
(7) standing the molten steel for 15min before the vacuum process is out of the station;
(8) the superheat degree of the molten steel of the continuous casting tundish is 27 ℃;
(9) the using amount of the covering agent for continuous casting is 0.7kg/t steel;
(10) the continuous casting speed of the whole furnace is constant at 1.0 m/min.
The finished sample was examined and shown in Table 1.
TABLE 1 Final ingredients/wt.%
| C | Si | Mn | P | S | Nb | Ti | Als |
| 0.0023 | 0.10 | 0.35 | 0.030 | 0.006 | 0.031 | 0.032 | 0.031 |
Claims (10)
1. The semisteel smelting method of the phosphorus-containing high-strength IF steel is characterized by comprising the following steps of: the method comprises the following steps:
a. smelting in a converter: primarily smelting the semi-steel into molten steel, and tapping when the P content in the molten steel is 0.010-0.020% and the C content is 0.03-0.05%;
b. LF refining: adding a submerged arc slagging agent into LF heating, and taking out of the furnace at 1625-1635 ℃;
c. RH refining: carrying out decarburization and deoxidation on molten steel after LF refining, and then carrying out alloying treatment;
d. and (3) continuously casting the molten steel into a blank after RH refining.
2. The semisteel smelting method for the phosphorus-containing high-strength IF steel according to claim 1, characterized in that: in the step a, the semisteel comprises the following components: 3.20-3.80% of C, 0.03-0.06% of Mn, 0.050-0.080% of P, 0.0010-0.005% of S, 0.01-0.04% of V, trace amounts of Cr, Si and Ti, and the balance of iron and inevitable impurities.
3. The semisteel smelting method for phosphorus-containing high-strength IF steel according to claim 1 or 2, characterized in that: in step a, at least one of the following is satisfied:
when the converter is charged, S is less than or equal to 0.002%;
the converter blowing process does not adopt a low-phosphorus steel blowing mode;
550-650 kg of submerged-arc slagging agent is added in the tapping process.
4. The semi-steel smelting method of the phosphorus-containing high-strength IF steel according to any one of claims 1 to 3, wherein: in the step b, the adding amount of the submerged arc slagging agent added in the LF heating is less than or equal to 5kg/t steel.
5. The semisteel smelting method for the phosphorus-containing high-strength IF steel according to any one of claims 1 to 4, characterized by comprising the following steps: in the step b, 350-450 kg/furnace aluminum modifier is added to the slag surface after LF refining treatment is finished; the aluminum modifier comprises 20-40% of CaO and Al2O310-30%, 38-42% of MAl, 2-4% of NaCl, less than or equal to 0.2% of S, less than or equal to 0.1% of P, and the balance of unavoidable impurities.
6. The semisteel smelting method for the phosphorus-containing high-strength IF steel according to any one of claims 1 to 5, wherein the semisteel smelting method comprises the following steps: in the step C, the RH station is adjusted to the target value at the initial stage of station entering and vacuum pumping according to the oxygen determination condition if the [ O ]/[ C ] value is not more than or equal to 1.6+ 0.1%.
7. The semisteel smelting method for the phosphorus-containing high-strength IF steel according to any one of claims 1 to 6, characterized by comprising the following steps: in the step c, after molten steel is decarburized for 8-10 min, metal manganese and ferrophosphorus are added, and the yield is controlled according to the neutral line components of 93-96% of metal manganese and 83-87% of ferrophosphorus.
8. The semisteel smelting method for the phosphorus-containing high-strength IF steel according to any one of claims 1 to 7, characterized by comprising the following steps: in the step c, performing deoxidation and aluminum alloying after decarburization treatment for 18-20 min, performing sampling and silicon alloying after circulation for 2-4 min, adjusting the alloy content according to the sampling result, and ensuring that the circulation time after total alloying is more than or equal to 8 min; and standing the molten steel for 15-25 min before the molten steel is taken out of the station.
9. The semisteel smelting method for the phosphorus-containing high-strength IF steel according to any one of claims 1 to 8, characterized by comprising the following steps: in step d, at least one of the following is satisfied:
the superheat degree of the molten steel of the continuous casting tundish is 20-35 ℃;
the using amount of the covering agent in continuous casting is 0.5-0.8 kg/t steel;
target pulling speed: 1.0-1.3 m/min, and adopting constant-speed pouring.
10. The phosphorus-containing high-strength IF steel prepared by the method of any one of claims 1 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115433867A (en) * | 2022-08-24 | 2022-12-06 | 攀钢集团西昌钢钒有限公司 | Phosphorus-containing high-strength IF steel smelted from semisteel and preparation method thereof |
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| CN111485068A (en) * | 2020-06-01 | 2020-08-04 | 攀钢集团西昌钢钒有限公司 | Smelting method of IF steel with high surface quality |
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| CN115433867A (en) * | 2022-08-24 | 2022-12-06 | 攀钢集团西昌钢钒有限公司 | Phosphorus-containing high-strength IF steel smelted from semisteel and preparation method thereof |
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Application publication date: 20211029 |