WO2016090769A1 - 一种不锈钢及其冶炼工艺 - Google Patents

一种不锈钢及其冶炼工艺 Download PDF

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WO2016090769A1
WO2016090769A1 PCT/CN2015/075355 CN2015075355W WO2016090769A1 WO 2016090769 A1 WO2016090769 A1 WO 2016090769A1 CN 2015075355 W CN2015075355 W CN 2015075355W WO 2016090769 A1 WO2016090769 A1 WO 2016090769A1
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nickel
furnace
controlled
nickel alloy
temperature
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PCT/CN2015/075355
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French (fr)
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姜海洪
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福建鼎信实业有限公司
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting

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  • the invention belongs to the technical field of metallurgical engineering, and particularly relates to a new process method for preparing stainless steel by combining nickel concentrate with roasting, RKEF, AOD and LF furnace.
  • NiS nickel sulfide
  • nickel in nickel-sulphide ore at home and abroad is passed through a concentrate roasting reverberatory furnace (electric furnace or blast furnace), smelting copper-nickel-sulfur, blowing nickel concentrate, and electrolyzing nickel after electrolysis, and the nickel content is greater than 99%.
  • the traditional stainless steel smelting method is to add electrolytic nickel to the AOD refining furnace and mix it with other raw materials in a certain proportion. After decarburization, dephosphorization and other processes, the oxidation and final refining are carried out to complete the liquid alloy composition and temperature adjustment, and finally become Stainless steel, refined stainless steel after refining is made of stainless steel slab made of continuous casting system.
  • the technical problem to be solved by the present invention is that the process steps for preparing stainless steel in the prior art are cumbersome, the intermediate energy is wasted, and the iron element in the nickel concentrate is separated and wasted; the present invention discloses a novel process for smelting stainless steel, using nickel concentrate
  • the roasting combines RKEF and AOD furnace triple method to smelt stainless steel to realize nickel concentrate
  • After receiving the production of stainless steel, the process is short.
  • the invention relates to a process for smelting stainless steel, which is a novel process for directly smelting stainless steel by using nickel concentrate after roasting, RKEF system, AOD furnace and LF furnace, and is formed into a slab by a continuous casting system, and the nickel concentrate is calcined Among them, Fe is used for the preparation of crude nickel alloy in the RKEF system.
  • a preferred embodiment of the process is that the SO2 formed during the calcination of the nickel concentrate reacts with the oxygen released during the calcination to form SO3, which is absorbed by 98.3% sulfuric acid to obtain pyrosulfuric acid, and is diluted to obtain sulfuric acid.
  • a preferred embodiment of the process is that the calcined ore produced by the nickel concentrate calcination and the recovered dust are added to a RKEF furnace for preparing a crude nickel alloy.
  • a preferred embodiment of the process is that the nickel concentrate is sieved and crushed to have a particle size of 6 mm or less, a calcination temperature of 850-900 C, and a blowing speed of 1.5 m/s at a wind speed of roasting.
  • the roasting ore and dust generated in the furnace after boiling roasting are recovered by the slag discharging cold pipe and the dust collecting system, and are added to the RKEF system for preparing the crude nickel alloy.
  • the nickel concentrate is sieved and crushed to have a particle size of 6 mm or less, and the calcination temperature is 850-900 C.
  • air is blown at a wind speed of 1.5 m/s, and the material is boiled in the furnace to produce roasting ore and dust.
  • the slag cold pipe and the dust collection system are recovered, and after mixing with the laterite ore (nickel oxide ore) and other materials, the RKEF system is added to prepare the crude nickel alloy.
  • a preferred technical solution of the process is that the slag type is controlled in step 2) such that the Si/Mg mass ratio is controlled between 1.75-1.85.
  • a preferred technical solution of the process is that the slag temperature is controlled in the range of 1550-1570 ° C in step 3); the iron temperature is controlled in the range of 1500-1520 ° C.
  • the insulating material is made of carbonized rice husk, and the particle size is controlled within a range of 0 to 5 mm; and the humidity is controlled at H 2 O ⁇ 0.5%.
  • the raw material mass ratio in the step 5) is: the use amount of the red-supplemented nickel-iron water is controlled within the range of 63%-67%, and the high-carbon ferrochrome addition amount is controlled at 28%-30%. Within the range, the amount of slag-forming agent added is controlled within the range of 5% to 7%.
  • the invention also relates to a stainless steel made using the above process.
  • the invention has the beneficial effects that the smelting of the nickel concentrate is combined with the RKEF and the AOD furnace triple method to smelt the stainless steel, and the nickel concentrate is directly produced into the stainless steel.
  • the process flow is short, and after the nickel concentrate is desulfurized by roasting, the Fe thereof is The iron oxide is added to the RKEF furnace for the preparation of the crude nickel alloy, which saves the process and utilizes the iron in the nickel concentrate, which reduces the cost and reduces the energy waste.
  • the exhaust gas generated during the roasting of the nickel sulfide ore is completely recovered into sulfuric acid and applied to the subsequent stainless steel hot rolling annealing and pickling process; the dust generated by the nickel concentrate roasting is recycled into the RKEF furnace for the preparation of the crude nickel alloy, which greatly reduces the Production costs, and fully realize the recycling and utilization of resources, in line with the national economic goals of energy conservation and emission reduction.
  • the nickel sulphide concentrate is oxidized in a roaster and oxygen to form nickel oxide, iron oxide and sulfur dioxide, sulfur dioxide and oxygen in the exhaust gas to produce heat by the heat generated by the oxidation reaction of the sulfuric acid.
  • the waste heat can be used for power generation.
  • the reaction formula of nickel sulfide concentrate made of nickel oxide is as follows:
  • reaction formula of sulfur dioxide used to produce sulfuric acid is as follows:
  • the reducibility of the oxide at the same temperature, the linear position is at a lower element, and the oxide in the upper part is easily reduced, that is, the more stable the oxide, that is, in the melting temperature range, the order of reduction of the oxide is Nickel, iron, silicon.
  • the nickel sulfide ore is sieved and crushed to have a particle size of 6 mm or less, the calcination temperature is 850-900 C, and the air is blown at a wind speed of 1.5 m/s during roasting, and the material is boiled in the furnace to produce roasting ore.
  • the cold tube is cooled, and after mixing with laterite ore (nickel oxide ore) and other materials, the RKEF system is added.
  • the tail gas is fully recovered into sulfuric acid.
  • the SO2 produced during the calcination of the nickel concentrate reacts with the oxygen released during the roasting process to form SO3, which is absorbed by 98.3% sulfuric acid to obtain pyrosulfuric acid, which is diluted to obtain sulfuric acid; the dust is fully recovered and added to the RKEF system for use.
  • Preparation of a crude nickel alloy; the sulfuric acid obtained above can achieve the following technical specifications.
  • the crude nickel alloy According to the temperature of the crude nickel alloy molten iron required for entering the furnace in the AOD refining furnace, the crude nickel alloy is smelted by the RKEF process, and the Si/Mg (mass ratio) is controlled between 1.75-1.85 by controlling the slag type;
  • the slag temperature is controlled in the range of 1550-1570C;
  • the iron temperature is controlled in the range of 1500-1520C;
  • [%Si] represents the silicon content in the molten steel
  • R (%CaO) / (% SiO 2 ) represents alkalinity; (% CaO) is effective - effective CaO content in lime.
  • the use amount of red-supplemented nickel-iron water is controlled within the range of 63%-67%, the amount of high-carbon ferrochrome added is controlled within the range of 28%-30%, and the amount of slag-forming agent is controlled within the range of 5%-7%.
  • the maximum oxygen amount is supplied, and the appropriate inert gas ratio is adjusted to achieve the purpose of decarburization and chromium-preserving temperature control, and the end temperature of the molten steel is controlled within the range of 1660-1680C, and the molten steel target
  • the carbon content is controlled in the range of 0.035% to 0.045%.
  • slag forming agent to control the sulfur in the steel to be below 0.005%, wherein the slagging agent can be: lime, fluorite, magnesia;
  • the tundish temperature is controlled at 1480-1485C; the pulling speed is controlled at 1.25-1.30m/min;
  • Physical state of the invention in the form of a plate; rectangular blank size: 6000 mm X 220 mm X 260 mm; slab size: 99000 mm X 160 mm X (470-750) mm.
  • the products produced by the novel process technology of the invention are suitable for petroleum, chemical, shipbuilding, automobile, construction, food, electronics, medical equipment, public facilities and the like.
  • the nickel sulfide concentrate is calcined by a roasting furnace to form nickel oxide, the tail gas is recovered into acid, and the slag type control, the slag temperature and the molten iron temperature are smelted in the crude nickel alloy.
  • Control and selection of insulation materials and control of particle size and humidity, reasonable mix of raw materials in stainless steel production greatly shortening the production process, reducing power consumption, production costs, shortening product time, increasing production capacity and realizing resources Comprehensive utilization, the site environment is more clean and environmentally friendly, and also reduces the labor intensity of employees, and produces refined stainless steel products that meet national standards and user requirements.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

一种不锈钢及其冶炼工艺。所述工艺是直接采用镍精矿经过焙烧、RKEF系统、AOD炉、LF炉连续冶炼不锈钢的新型工艺，并通过连铸系统制作成板坯，镍精矿经过焙烧后其中的Fe用于RKEF炉中粗镍合金的制备。

Description

一种不锈钢及其冶炼工艺 技术领域
本发明属于为冶金工程技术领域，具体涉及一种采用焙烧、RKEF、AOD和LF炉联合冶炼镍精矿制备不锈钢的新工艺方法。
背景技术
世界上可开采的镍资源有二类，一类是硫化矿床，另一类是氧化矿床。由于硫化镍矿资源品质好，工艺技术成熟，现约60％-70％的镍产量来源于硫化镍矿。金属镍是300系不锈钢的重要的化学成本，镍含量大于8％，不锈钢中镍的主要来源是以硫化镍(NiS)形式存在于镍精矿中的镍。硫化镍精矿中的镍含量为10％左右，铁含量20％左右，S含量30％左右。
目前，在国内外硫化镍矿中的镍要通过精矿焙烧反射炉(电炉或鼓风炉)、冶炼铜镍硫、吹炼镍精矿、电解后获得电解镍，镍含量大于99％。传统的不锈钢冶炼方法是将电解镍加入AOD精炼炉与其他原料按一定比例配比，通过脱碳、脱磷等过程后，在进行氧化和最终精炼，完成液态合金成份和温度调整，最终变成不锈钢，精炼后的合格不锈钢采用连铸系统制成的不锈钢板坯。
由于硫化镍矿到生产成电解镍的过程中要把焙烧后矿通过冶炼铜镍硫、吹炼镍精矿、电解提纯至99％以上，再用于不锈钢冶炼，生产环节多，设备投资高，产品成才时间长，镍金属回收率低，镍精矿中的铁元素被分离做为渣料浪费掉了等一系列问题。
使用镍精矿采用焙烧工艺，制成氧化矿，通过RKEF生产粗镍合金通过铁水温度控制，将铁水直接送入AOD炉三联精炼等生产不锈钢的工艺技术还没有见报道，属国内外首创。
发明内容
本发明要解决的技术问题是，现有技术制备不锈钢的工艺步骤繁琐、中间能量浪费、镍精矿中的铁元素被分离浪费；本发明公开了一种冶炼不锈钢的新型工艺，采用镍精矿的焙烧结合RKEF、AOD炉三联法冶炼不锈钢，实现镍精矿直 接到不锈钢的生产，工艺流程短，镍精矿经焙烧除硫后，其中的Fe以氧化铁加入RKEF炉中用于粗镍合金的制备，节省了工序、利用了镍精矿中的铁，降低了成本，减少能源浪费。
为实现上述目的，本发明的技术方案如下。
一种冶炼不锈钢的工艺，所述工艺是直接采用镍精矿经过焙烧、RKEF系统、AOD炉、LF炉连续冶炼不锈钢的新型工艺，并通过连铸系统制作成板坯，镍精矿经过焙烧后其中的Fe用于RKEF系统中粗镍合金的制备。
所述工艺的优选方案为，所述镍精矿焙烧过程中生成SO2与焙烧过程中释放的氧气反应生成SO3，其经98.3％的硫酸吸收得到焦硫酸，稀释得到硫酸。
所述工艺的优选方案为，所述镍精矿焙烧产生的焙烧矿和回收的粉尘加入RKEF炉中用于制备粗镍合金。
所述工艺的优选方案为，所述镍精矿焙烧前需经过筛分破碎使其粒径为6mm以下，焙烧温度为850-900C，焙烧时以1.5m/s的风速吹入空气，物料在炉内沸腾焙烧后产生焙烧矿和粉尘经排渣冷管和收尘系统回收加入RKEF系统用于制备粗镍合金。
所述工艺的优选方案为，工艺包括以下具体步骤：
1)镍精矿经过筛分破碎使其粒径为6mm以下，焙烧温度为850-900C，焙烧时以1.5m/s的风速吹入空气，物料在炉内沸腾焙烧后产生焙烧矿和粉尘经排渣冷管和收尘系统回收，同红土矿(氧化镍矿)和其它物料进行配比后，加入RKEF系统用于制备粗镍合金。
2)根据AOD精炼炉入炉所需粗镍合金铁水温度，采用RKEF工艺熔炼粗镍合金，通过对渣型进行控制；
3)严格控制粗镍合金生产时的渣温和铁温；
4)采用钢包盛装粗镍合金铁水；
5)出完粗镍合金铁水后，立即用保温料将其盖住，控制好铁水温度；
6)用行车吊运钢包并将粗镍合金铁水送入AOD精炼炉进行精炼；
7)AOD精炼炉上的精炼按AOD精炼炉技术操作规程执行；
8)将合格的AOD钢水倒入钢包，用行车吊至LF炉进行深脱氧；
9)大包钢水按LF炉工艺操作规程执行；
10)大包钢水通过行车吊运至连铸回转台，连铸成矩形坯或板坯；
11)矩形坯或板坯的制作按连铸机技术操作规程执行；
12)不锈钢制成板坯后入库。
所述工艺的优选技术方案为，在步骤2)中对渣型进行控制是使Si/Mg质量比控制在1.75-1.85之间。
所述工艺的优选技术方案为，在步骤3)中渣温控制在1550-1570℃范围内；铁温控制在1500-1520℃范围内。
所述工艺的优选技术方案为，在步骤5)中所述保温料采用碳化稻壳，其粒度控制在0～5mm范围之内；湿度控制在H2O≤0.5％。
所述工艺的优选技术方案为，在步骤5)中原料质量配比为：红送镍铁水的使用量控制在63％-67％范围内，高碳铬铁加入量控制在28％-30％范围内，造渣剂的加入量控制在5％-7％范围内。
本发明还涉及一种不锈钢，所述不锈钢采用上述工艺制成。
本发明的有益效果是，采用镍精矿的焙烧结合RKEF、AOD炉三联法冶炼不锈钢，实现镍精矿直接到不锈钢的生产，工艺流程短，镍精矿经焙烧除硫后，其中的Fe以氧化铁加入RKEF炉中用于粗镍合金的制备，节省了工序、利用了镍精矿中的铁，降低了成本，减少能源浪费。而且硫化镍矿焙烧的过程中产生的尾气完全回收制成硫酸应用于后序不锈钢热轧退火酸洗流程；镍精矿焙烧产生的粉尘回收加入RKEF炉中用于制备粗镍合金，大幅降低了生产成本，并充分实现了资源的回收和利用，符合国家节能减排的经济目标。
具体实施方式
硫化镍精矿在焙烧炉与氧气被高温氧化生成氧化镍、氧化铁和二氧化硫，二氧化硫以及尾气中的氧气通过接触法制成硫酸氧化反应中产生的热量为生产提供热能，余热可以用于发电。
其中硫化镍精矿制成氧化镍反应式如下：
2NiS+3O2＝2NiO+2SO2放热反应
CuFeS2+O2---Fe2O3+CuO+SO2
Cu2S+O2---CuO+SO2
Fe7S8+O2---Fe2O3+SO2
FeS+O2---Fe2O3+SO2
NiS+O2---NiO+SO2
NiS2+O2----NiO+SO2
S2+O2---SO2
NiSO4+NiS---NiO+SO2
CuSO4+CuS---CuO+Cu2O+SO2
二氧化硫用于制硫酸的反应式如下：
2SO2+O2＝△＝2SO3(该反应为可逆反应)
用98.3％硫酸吸收SO3后得到焦硫酸，再在其中加入水，得到硫酸。
SO3+H2SO4＝H2S2O7(焦硫酸)
H2S2O7+H2O＝2H2SO4
氧化物的还原性在同温下，直线位置处于较低的元素，易将其上部的氧化物还原出来，即其氧化物越稳定，也就是说在熔炼温度范围内，氧化物的还原顺序为镍、铁、硅。
1)粗镍合金生产的反应式如下：
NiO+C＝Ni+CO
FeO+C＝Fe+CO
SiO2+2C＝Si+2CO
2)不锈钢精炼的主要反应式如下：
脱碳反应机理
2C+O2(气)＝2CO；C+O2(气)＝CO2；Cr3O4(固)+4C＝3Cr+4CO
脱硅反应机理
Si+O2(气)＝SiO2
还原反应机理
Cr3O4(固)+2Si＝3Cr+2SiO2
脱硫反应机理
FeS+CaO＝CaS+FeO
具体实施例
现在以9平米沸腾炉、33000kVA电炉、45tAOD精炼炉、R10二机二流小板 坯连铸机上生产不锈钢为例，来叙述实施本发明的方法：
1)硫化镍矿经过筛分破碎使其粒径为6mm以下，焙烧温度为850-900C，焙烧时以1.5m/s的风速吹入空气，物料在炉内沸腾焙烧后产生焙烧矿经排渣冷管冷却，同红土矿(氧化镍矿)和其它物料进行配比后，加入RKEF系统。尾气充分回收制成硫酸，镍精矿焙烧过程中生成SO2与焙烧过程中释放的氧气反应生成SO3，其经98.3％的硫酸吸收得到焦硫酸，稀释得到硫酸；粉尘充分回收加入RKEF系统中用于制备粗镍合金；上述制得的硫酸可以达到以下的技术指标。
硫酸的指标
Figure PCTCN2015075355-appb-000001
2)根据AOD精炼炉入炉所需粗镍合金铁水温度，采用RKEF工艺熔炼粗镍合金，通过对渣型进行控制，使Si/Mg(质量比)控制在1.75-1.85之间；
3)严格控制粗镍合金生产时的渣温和铁温，渣温控制在1550-1570C范围内；铁温控制在1500-1520C范围内；
4)采用钢包盛装粗镍合金铁水；
5)出完粗镍合金铁水后，立即用碳化稻壳(保温料)将其盖住，控制好铁水温度，其中保温料的粒度控制在0～5mm范围之内；其湿度控制在H2O≤0.5％；
6)用行车吊运钢包并将粗镍合金铁水送入AOD精炼炉进行精炼；其中合金料与造渣剂加入量计算：
(1)合金料加入计算：
高碳铬铁加入量：50000*18.2％/60％＝15167(kg)
红送镍铁水量：50000-15167＝34833(kg)
(2)氧化期石灰加入量：
石灰加入量＝{[％Si]*50000*2.14*R}/(％CaO)有效
其中，式中[％Si]表示钢水中硅含量；
R＝(％CaO)/(％SiO2)表示碱度；(％CaO)有效——石灰中有效CaO含量。
其中红送镍铁水的使用量控制在63％-67％范围内，高碳铬铁加入量控制在28％-30％范围内，造渣剂的加入量控制在5％-7％范围内。
7)AOD精炼炉上的精炼按AOD精炼炉技术操作规程执行，具体如下：
(1)根据钢液中的碳含量，供入最大氧量，同时调整合适的惰性气体比例，达到脱碳保铬控温目的，将钢液终点温度控制在1660-1680C范围内，钢液目标碳含量控制在0.035％-0.045％范围内。
(2)通过料仓加入还原剂硅铁，还原渣中的氧化物；
(3)加入造渣剂，将钢中硫控制在0.005％以下，其中造渣剂可为：石灰、萤石、镁砂；
8)将合格的AOD钢水倒入钢包，用行车吊至LF炉进行深脱氧；
9)大包钢水按LF炉工艺操作规程执行，具体如下：
(1)送电化渣升温，将温度升至满足连铸要求温度；
(2)调整氩气压力0.5Mpa左右，软吹10-15分钟；
(3)停气镇静钢水8分钟左右，保证夹杂物充分上浮，提高钢水纯净度；
10)大包钢水通过行车吊运至连铸回转台，连铸成矩形坯或板坯；
11)矩形坯或板坯的制作按连铸机技术操作规程执行，具体如下：
(1)中间包温度控制在1480-1485C；拉速控制在1.25-1.30m/min；
(2)塞棒、二冷喷淋水采用自动控制；
(3)全程保护浇注。
12)不锈钢制成板坯后入库。
产品的化学成分及炉渣成分：
(1)产品成分
Figure PCTCN2015075355-appb-000002
(2)炉渣成分
成分 CaO MgO SiO2 Al2O3 FeO MnO Ni
质量％ 58-63 3-7 26-31 1.5-3.5 0.1-0.2 0.1-0.2 ≤0.05
本发明的物理状态：呈板状；矩形坯尺寸：6000mm X 220mm X 260mm；板坯尺寸：99000mm X 160mm X(470-750)mm。本发明的新型工艺技术生产的产品适用于石油、化工、造船、汽车、建筑、食品、电子、医疗设备、公共设施等。
综上所述，本发明的生产工艺方法，通过焙烧炉对硫化镍精矿进行焙烧制成氧化镍，尾气回收制酸，并对粗镍合金熔炼时渣型的控制、渣温、铁水温度的控制以及保温料的选择及其粒度、湿度的控制，不锈钢生产时原料配比的合理搭配，大大缩短了生产流程、降低了电耗、生产成本，产品成材时间缩短，提高产能，实现了资源的综合利用，现场环境更加清洁环保，还减轻了员工的劳动强度，且生产出符合国家标准和用户要求的精制不锈钢产品。

Claims (10)

  1. 一种冶炼不锈钢的工艺，其特征在于，所述工艺是直接采用镍精矿经过焙烧、RKEF系统、AOD炉、LF炉连续冶炼不锈钢的新型工艺，并通过连铸系统制作成板坯，镍精矿经过焙烧后其中的Fe用于RKEF系统中粗镍合金的制备。
  2. 根据权利要求1所述的工艺，其特征在于，所述镍精矿焙烧过程中生成SO2与焙烧过程中释放的氧气反应生成SO3，其经98.3％的硫酸吸收得到焦硫酸，稀释得到硫酸。
  3. 根据权利要求1所述的工艺，其特征在于，所述镍精矿焙烧产生的焙烧矿和回收的粉尘加入RKEF炉中用于制备粗镍合金。
  4. 根据权利要求1所述的工艺，其特征在于，所述镍精矿焙烧前需经过筛分破碎使其粒径为6mm以下，焙烧温度为850-900C，焙烧时以1.5m/s的风速吹入空气，物料在炉内沸腾焙烧后产生焙烧矿和粉尘经排渣冷管和收尘系统回收加入RKEF系统用于制备粗镍合金。
  5. 根据权利要求1所述的工艺，其特征在于，所述工艺包括以下具体步骤：
    1)镍精矿经过经过筛分破碎进行焙烧，温度控制为850-900C，经过焙烧、冷却、除尘、脱气、降温后的焙烧矿和回收的粉尘同红土镍矿(氧化镍矿)及其它物料进行混配，将物料加入RKEF系统用于制备粗镍合金，尾气充分回收制成硫酸。
    2)根据AOD精炼炉入炉所需粗镍合金铁水温度，采用RKEF工艺熔炼粗镍合金，通过对渣型进行控制；
    3)严格控制粗镍合金生产时的渣温和铁温；
    4)采用钢包盛装粗镍合金铁水；
    5)出完粗镍合金铁水后，立即用保温料将其盖住，控制好铁水温度；
    6)用行车吊运钢包并将粗镍合金铁水送入AOD精炼炉进行精炼；
    7)AOD精炼炉上的精炼按AOD精炼炉技术操作规程执行；
    8)将合格的AOD钢水倒入钢包，用行车吊至LF炉进行深脱氧；
    9)大包钢水按LF炉工艺操作规程执行；
    10)大包钢水通过行车吊运至连铸回转台，连铸成矩形坯或板坯；
    11)矩形坯或板坯的制作按连铸机技术操作规程执行；
    12)不锈钢制成板坯后入库。
  6. 根据权利要求5所述的工艺，其特征在于，在步骤2)中对渣型进行控制是使Si/Mg质量比控制在1.75-1.85之间。
  7. 根据权利要求5所述的工艺，其特征在于，在步骤3)中渣温控制在1550-1570℃范围内；铁温控制在1500-1520℃范围内。
  8. 根据权利要求5所述的工艺，其特征在于，在步骤5)中所述保温料采用碳化稻壳，其粒度控制在0～5mm范围之内；湿度控制在H2O≤0.5％。
  9. 根据权利要求2所述的工艺，其特征在于，在步骤5)中原料质量配比为：红送镍铁水的使用量控制在63％-67％范围内，高碳铬铁加入量控制在28％-30％范围内，造渣剂的加入量控制在5％-7％范围内。
  10. 一种不锈钢，其特征在于，所述不锈钢采用的是权利要求1-9之一所述的工艺制成。
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