CN109112418B - A kind of continuous casting method of high manganese steel - Google Patents
A kind of continuous casting method of high manganese steel Download PDFInfo
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- 229910000617 Mangalloy Inorganic materials 0.000 title claims abstract description 20
- 238000009749 continuous casting Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005266 casting Methods 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000011572 manganese Substances 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 28
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 239000002893 slag Substances 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 229910052786 argon Inorganic materials 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical group [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 229910052749 magnesium Inorganic materials 0.000 claims description 5
- 239000011777 magnesium Substances 0.000 claims description 5
- 238000007711 solidification Methods 0.000 claims description 5
- 230000008023 solidification Effects 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 1
- 229910052681 coesite Inorganic materials 0.000 claims 1
- 229910052593 corundum Inorganic materials 0.000 claims 1
- 229910052906 cristobalite Inorganic materials 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 229910052682 stishovite Inorganic materials 0.000 claims 1
- 229910052905 tridymite Inorganic materials 0.000 claims 1
- 229910001845 yogo sapphire Inorganic materials 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 229910045601 alloy Inorganic materials 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- 230000035945 sensitivity Effects 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 5
- 238000007689 inspection Methods 0.000 description 5
- 238000005275 alloying Methods 0.000 description 2
- 238000004512 die casting Methods 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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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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- 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
- B22D11/111—Treating the molten metal by using protecting powders
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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
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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Abstract
Description
技术领域technical field
本发明属于冶金领域，尤其涉及一种高锰钢的连铸方法。The invention belongs to the field of metallurgy, and in particular relates to a continuous casting method of high manganese steel.
背景技术Background technique
高锰钢在现代的社会被广泛的应用于耐磨件、汽车、矿山机械以及海洋平台等。因为钢中普遍含有较高的Mn，所以无论是合金化，还是连铸过程，都是生产难度较高的钢种。一般来说，生产此类钢种都是特钢厂的电弧炉+模铸的工艺。电弧炉的冶炼解决了Mn的合金化问题，而模铸避开了连铸的弯曲矫直，生产风险降低。但是对于连铸而言，由于Mn变高，钢水的导热变差，热收缩系数较大，导致铸坯晶粒粗大，热应力变大。高锰钢的钢水流动性好，连铸有一定的漏钢风险。国内的大方坯铸机较多，此类钢的生产需求紧迫，工艺鲜有报道。High manganese steel is widely used in wear parts, automobiles, mining machinery and offshore platforms in modern society. Because steel generally contains high Mn, whether it is alloying or continuous casting, it is a steel that is difficult to produce. Generally speaking, the production of this type of steel is the process of electric arc furnace + die casting in special steel plants. The smelting of the electric arc furnace solves the alloying problem of Mn, and the die casting avoids the bending straightening of the continuous casting, and the production risk is reduced. However, for continuous casting, due to the increase of Mn, the thermal conductivity of molten steel is deteriorated, and the thermal shrinkage coefficient is large, resulting in coarse crystal grains of the slab and increased thermal stress. The molten steel of high manganese steel has good fluidity, and continuous casting has a certain risk of steel breakout. There are many bloom casting machines in China, the production demand of this type of steel is urgent, and the process is rarely reported.
发明内容SUMMARY OF THE INVENTION
本发明的目的在于克服上述问题和不足而提供一种大方坯的高锰钢连铸工艺，使化学成分包括C：0.2％～0.25％、Mn：4.5％～5.5％、Si：0.2％～0.3％、P<0.008％、S<0.002％以及Al：0.015％～0.04％的高锰钢使用常规大方坯铸机能够顺利生产。The purpose of the present invention is to overcome the above problems and deficiencies and provide a high-manganese steel continuous casting process for bloom, so that the chemical components include C: 0.2%-0.25%, Mn: 4.5%-5.5%, Si: 0.2%-0.3% %, P<0.008%, S<0.002% and Al: 0.015%～0.04% high manganese steel can be produced smoothly using conventional bloom casting machine.
本发明目的是这样实现的：The object of the present invention is achieved in this way:
一种高锰钢的方法，该方法包括将钢水从中间包浇注至结晶器，形成未完全凝固的铸坯，然后将该未完全凝固的铸坯以拉速V从结晶器中拉出并经过二冷段，得到完全凝固的铸坯；A method for high manganese steel, the method comprising pouring molten steel from a tundish into a mold to form an incompletely solidified slab, and then pulling the incompletely solidified slab from the mold at a pulling speed V and passing through the In the second cooling section, a fully solidified billet is obtained;
(1)本发明所述的高锰钢的化学成分包括C：0.21％～0.25％、Mn：4.5％～5.5％、Si：0.2％～0.3％、P<0.008％、S<0.002％以及Al：0.015％～0.04％，连铸坯断面为280*380mm；(1) The chemical composition of the high manganese steel according to the present invention includes C: 0.21%-0.25%, Mn: 4.5%-5.5%, Si: 0.2%-0.3%, P<0.008%, S<0.002% and Al : 0.015%～0.04%, the section of continuous casting billet is 280*380mm;
(2)所述中间包烘烤要求煤气流量80～110m3/h，烘烤时间5小时以上，烘烤温度保持在1360～1380℃，机前保持20～25℃的过热度浇注；(2) The tundish baking requires a gas flow of 80 to 110 m 3 /h, a baking time of more than 5 hours, a baking temperature of 1360 to 1380 °C, and a superheat of 20 to 25 °C in front of the machine for pouring;
(3)开始浇注前25～30min上水口满量程吹氩气，包盖吹氩在开浇加覆盖剂后关闭，长水口吹氩要求为满量程的55～65％，中包覆盖要求不允许裸露钢水。为提高中包渣吸附夹杂的能力，覆盖剂使用镁质覆盖剂；(3) 25 to 30 minutes before the start of pouring, the upper nozzle is blown with argon at the full scale, and the argon blowing on the cover is closed after opening the pouring agent and the covering agent is added. Bare molten steel. In order to improve the ability of the tundish slag to absorb inclusions, the covering agent uses magnesium covering agent;
(4)机前使用单渣线操作，总渣层厚度控制在35±5mm，自动升速操作，液位波动控制±2mm以内，结晶器电磁搅拌电流480～520A，频率1.2～1.8Hz，凝固末端电磁搅拌电流580～620A，频率4.5～5.5Hz，(4) Single slag line operation is used in front of the machine, the thickness of the total slag layer is controlled at 35±5mm, the speed is automatically increased, the liquid level fluctuation is controlled within ±2mm, the electromagnetic stirring current of the mold is 480~520A, the frequency is 1.2~1.8Hz, and the solidification is carried out. The end electromagnetic stirring current is 580~620A, the frequency is 4.5~5.5Hz,
(5)连铸保护渣主要成分CaO：32％±3％，SiO2：24％±3％，Al2O3≤8％，C：30％±2％，F：6％±3％，MgO≤8％，H2O≤0.5％，熔点：955±30℃，1300℃时黏度：0.11±0.09pa.s/(1300℃)。(5) The main components of continuous casting mold flux are CaO: 32%±3%, SiO 2 : 24%±3%, Al 2 O 3 ≤8%, C: 30%±2%, F: 6%±3%, MgO≤8%, H 2 O≤0.5%, melting point: 955±30℃, viscosity at 1300℃: 0.11±0.09pa.s/(1300℃).
(6)为保证铸坯表面质量，出拉矫机温度控制在900～950℃，要求标准拉速0.6～0.8m/min，恒拉速操作；二冷段分为两模式给水，第一模式采用弱冷水线，比水量为0.15～0.25L/kg，使铸坯缓慢冷却，保证铸坯质量，第二模式即铸机的最后两个区喷嘴关闭，进一步防止裂纹的产生；(6) In order to ensure the surface quality of the casting billet, the temperature of the drawing and leveling machine is controlled at 900~950℃, the standard drawing speed is 0.6~0.8m/min, and the constant drawing speed operation; the second cooling section is divided into two modes of water supply, the first mode The weak cold water line is adopted, and the specific water volume is 0.15~0.25L/kg, so that the casting billet is slowly cooled to ensure the quality of the casting billet. The second mode is the closing of the nozzles in the last two areas of the casting machine to further prevent the occurrence of cracks;
(6)为防止高合金钢应力裂纹，铸坯采取热装制度，抢温快速进加热炉，保证进炉表面温度在650～700℃。(6) In order to prevent stress cracks in high-alloy steel, the casting billet adopts a hot charging system, and quickly enters the heating furnace to ensure that the surface temperature of the entering furnace is 650-700 °C.
本发明的有益效果在于，本发明提供的方法解决了传统工艺在大方坯连铸面临较大合金总量、裂纹敏感性较强的高锰钢的生产。由于合金量大、钢的自身强度较大，而且高锰带来的裂纹敏感性变强，对铸坯质量要求较高，原有的常规连铸工艺不能满足其生产。此发明对冷却方式、拉速、中包烘烤以及抢温进加热炉等工艺进行了调整，经检验，铸坯的表面内部质量良好，夹杂物控制均小于0.5级，满足了大方坯对高锰钢的生产。The beneficial effect of the present invention is that, the method provided by the present invention solves the production of high manganese steel with large total alloy amount and strong crack sensitivity in bloom continuous casting in the traditional process. Due to the large amount of alloy, the high strength of the steel itself, and the increased crack sensitivity caused by high manganese, the quality requirements of the slab are high, and the original conventional continuous casting process cannot meet its production. This invention adjusts the cooling method, drawing speed, tundish baking, and rushing into the heating furnace. After inspection, the surface and internal quality of the billet are good, and the control of inclusions is less than 0.5, which satisfies the requirements of the bloom. Production of manganese steel.
具体实施方式Detailed ways
下面通过实施例对本发明作进一步的说明。The present invention will be further illustrated by the following examples.
实施例1：Example 1:
一种高锰钢的方法，A method of high manganese steel,
(1)本试验钢的中包钢水成分包括C：0.24％、Mn：5.02％、Si：0.27％、P：0.0073％、S：0.0019％以及Al：0.033％，生产断面为280*380mm的传统大方坯铸机；(1) The tundish molten steel composition of this test steel includes C: 0.24%, Mn: 5.02%, Si: 0.27%, P: 0.0073%, S: 0.0019% and Al: 0.033%, and the production section is 280*380mm Traditional bloom casting machines;
(2)中包烘烤要求小火，煤气流量90m3/h，5.6小时，烘烤温度保持在1370～1375℃，机前过热度26℃；(2) The middle bag baking requires a small fire, the gas flow rate is 90m 3 /h, 5.6 hours, the baking temperature is kept at 1370 ~ 1375 ℃, and the superheating degree in front of the machine is 26 ℃;
(3)开浇前28min上水口满量程吹氩气，包盖吹氩在开浇加覆盖剂后关闭，长水口吹氩开阀60％，中包覆盖要求不允许裸露钢水；中包覆盖剂使用镁质覆盖剂；(3) 28 minutes before the start of pouring, the upper nozzle is blown with argon at the full scale, and the argon blowing on the cover is closed after pouring and the covering agent is added, and the long nozzle is blown with argon to open the valve for 60%. use a magnesium covering agent;
(4)机前使用单渣线操作，总渣层厚度控制在35±5mm，自动升速操作，液位波动控制±2mm以内，结晶器电磁搅拌电流500A，频率1.5Hz，凝固末端电磁搅拌电流600A，频率5Hz；(4) Single slag line operation is used in front of the machine, the total slag layer thickness is controlled at 35±5mm, the speed is automatically increased, the liquid level fluctuation is controlled within ±2mm, the electromagnetic stirring current of the mold is 500A, the frequency is 1.5Hz, and the electromagnetic stirring current at the end of solidification 600A, frequency 5Hz;
(5)保护渣成分见表1；(5) See Table 1 for the composition of mold slag;
表1高锰钢保护渣主要成分Table 1 Main components of high manganese steel mold slag
(5)出拉矫机温度控制在930℃，拉速0.70m/min，恒拉速操作；二冷段分为两模式给水，第一模式采用弱冷水线，比水量0.2L/Kg，第二模式即铸机的最后两个区喷嘴关闭；(5) The temperature of the pulling leveler is controlled at 930°C, the pulling speed is 0.70m/min, and the constant pulling speed operation; the second cooling section is divided into two modes of water supply, the first mode adopts weak cold water line, the specific water volume is 0.2L/Kg, and the second The second mode means that the nozzles in the last two zones of the casting machine are closed;
(6)铸坯采取热装制度，抢温快速进加热炉，进炉铸坯表面温度在680℃。(6) The billet adopts the hot charging system, and the temperature is quickly fed into the heating furnace, and the surface temperature of the billet entering the furnace is 680 °C.
对生产出的铸坯进行高倍、低倍检验。经检验，高倍A类、B类、C类、D类夹杂都控制在0.5级以下。低倍方面，铸坯内部和表面质量良好，中心疏松、中心偏析、缩孔都控制在1.0级以下，满足了大方坯对高锰钢的生产。High magnification and low magnification inspection of the produced slab. After inspection, the high-magnification Class A, Class B, Class C, and Class D inclusions are all controlled below 0.5. In terms of low magnification, the internal and surface quality of the billet is good, and the center porosity, center segregation and shrinkage cavity are all controlled below 1.0 level, which satisfies the production of high manganese steel in bloom.
实施例2：Example 2:
(1)本试验钢的中包钢水成分包括C：0.22％、Mn：5.21％、Si：0.26％、P：0.0071％、S：0.0018％以及Al：0.034％，生产断面为280*380mm的传统大方坯铸机；(1) The tundish molten steel composition of this test steel includes C: 0.22%, Mn: 5.21%, Si: 0.26%, P: 0.0071%, S: 0.0018% and Al: 0.034%, and the production section is 280*380mm Traditional bloom casting machines;
(2)中包烘烤要求小火，煤气流量95m3/h，5.5小时，烘烤温度保持在1361～1367℃，机前过热度27℃，热度浇注；(2) The middle bag baking requires a small fire, the gas flow rate is 95m 3 /h, 5.5 hours, the baking temperature is kept at 1361 ~ 1367 ℃, the superheat before the machine is 27 ℃, and the heat is poured;
(3)开浇前30min上水口满量程吹氩气，包盖吹氩在开浇加覆盖剂后关闭，长水口吹氩开阀60％，中包覆盖要求不允许裸露钢水；使用带台长水口，强化保护浇注，中包覆盖剂使用镁质覆盖剂；(3) 30 minutes before the start of pouring, the upper nozzle is blown with argon at the full scale, and the cover is blown with argon after pouring and the covering agent is added, and the long nozzle is blown with argon to open the valve by 60%. Nozzle, strengthen protection and pouring, and use magnesium covering agent for middle bag covering agent;
(4)机前使用单渣线操作，总渣层厚度控制在35±5mm，自动升速操作，液位波动控制±2mm以内，结晶器电磁搅拌电流500A，频率1.5Hz，凝固末端电磁搅拌电流600A，频率5Hz；(4) Single slag line operation is used in front of the machine, the total slag layer thickness is controlled at 35±5mm, the speed is automatically increased, the liquid level fluctuation is controlled within ±2mm, the electromagnetic stirring current of the mold is 500A, the frequency is 1.5Hz, and the electromagnetic stirring current at the end of solidification 600A, frequency 5Hz;
(5)保护渣成分见表2；(5) see Table 2 for the composition of mold slag;
表2高锰钢保护渣的主要成分(wt％)Table 2 Main components of high manganese steel mold slag (wt%)
(6)出拉矫机温度控制在940℃，拉速0.70m/min，恒拉速操作；二冷段分为两模式给水，第一模式采用弱冷水线，比水量0.2L/Kg，第二模式即铸机的最后两个区喷嘴关闭；(6) The temperature of the pulling leveler is controlled at 940℃, the pulling speed is 0.70m/min, and the constant pulling speed is operated; the second cooling section is divided into two modes of water supply, the first mode adopts weak cold water line, the specific water volume is 0.2L/Kg, and the second mode adopts the weak cold water line. The second mode means that the nozzles in the last two zones of the casting machine are closed;
(7)铸坯采取热装制度，抢温快速进加热炉，进炉铸坯表面温度在690℃。(7) The billet adopts the hot charging system, and the temperature is quickly fed into the heating furnace, and the surface temperature of the billet entering the furnace is 690 °C.
实施例3：Example 3:
(1)本试验钢的中包钢水成分包括C：0.24％、Mn：5.29％、Si：0.29％、P：0.0075％、S：0.0014％以及Al：0.038％，生产断面为280*380mm的传统大方坯铸机；(1) The tundish molten steel composition of this test steel includes C: 0.24%, Mn: 5.29%, Si: 0.29%, P: 0.0075%, S: 0.0014% and Al: 0.038%, and the production section is 280*380mm Traditional bloom casting machines;
(2)中包烘烤要求小火，煤气流量100m3/h，5.5小时，烘烤温度保持在1361～1372℃，机前过热度26℃；(2) The middle bag baking requires a small fire, the gas flow rate is 100m 3 /h, 5.5 hours, the baking temperature is kept at 1361 ~ 1372 ℃, and the superheating degree before the machine is 26 ℃;
(3)开浇前32min上水口满量程吹氩气，包盖吹氩在开浇加覆盖剂后关闭，长水口吹氩开阀62％，中包覆盖要求不允许裸露钢水。中包覆盖剂使用镁质覆盖剂；(3) 32 minutes before the start of pouring, the upper nozzle is blown with argon at the full range, and the argon blowing on the cover is closed after the opening and pouring and the covering agent is added. The long nozzle is blown with argon to open 62% of the valve. The middle-package covering agent uses magnesium covering agent;
(4)机前使用单渣线操作，总渣层厚度控制在35±5mm，自动升速操作，液位波动控制±2mm以内，结晶器电磁搅拌电流510A，频率1.6Hz，凝固末端电磁搅拌电流610A，频率5.4Hz；(4) Single slag line operation is used in front of the machine, the total slag layer thickness is controlled at 35±5mm, the speed is automatically increased, the liquid level fluctuation is controlled within ±2mm, the electromagnetic stirring current of the mold is 510A, the frequency is 1.6Hz, and the electromagnetic stirring current at the solidification end 610A, frequency 5.4Hz;
(5)保护渣成分见表3；(5) See Table 3 for the composition of mold slag;
表3高锰钢保护渣的主要成分(wt％)Table 3 Main components of high manganese steel mold slag (wt%)
(5)出拉矫机温度控制在945℃，拉速0.70m/min，恒拉速操作；二冷段分为两模式给水，第一模式采用弱冷水线，比水量0.2L/Kg，第二模式即铸机的最后两个区喷嘴关闭；(5) The temperature of the pulling leveler is controlled at 945℃, the pulling speed is 0.70m/min, and the operation is constant; The second mode means that the nozzles in the last two zones of the casting machine are closed;
(6)铸坯采取热装制度，抢温快速进加热炉，进炉铸坯表面温度在694℃。(6) The billet adopts the hot charging system, and the temperature is quickly fed into the heating furnace. The surface temperature of the billet entering the furnace is 694 °C.
对生产出的铸坯进行高倍、低倍检验。经检验，高倍A类、B类、C类、D类夹杂都控制在0.5级以下。低倍方面，铸坯内部和表面质量良好，中心疏松、中心偏析、缩孔都控制在1.0级以下，满足了大方坯对高锰钢的生产。High magnification and low magnification inspection of the produced slab. After inspection, the high-magnification Class A, Class B, Class C, and Class D inclusions are all controlled below 0.5. In terms of low magnification, the internal and surface quality of the billet is good, and the center porosity, center segregation and shrinkage cavity are all controlled below 1.0 level, which satisfies the production of high manganese steel in bloom.
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