CN107287502A - A kind of nitrogenous steel smelting process - Google Patents

A kind of nitrogenous steel smelting process Download PDF

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Publication number
CN107287502A
CN107287502A CN201710355967.5A CN201710355967A CN107287502A CN 107287502 A CN107287502 A CN 107287502A CN 201710355967 A CN201710355967 A CN 201710355967A CN 107287502 A CN107287502 A CN 107287502A
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steel
nitrogen
tapping
furnace
temperature
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胡建成
姚伟
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Henan Zhongyuan Special Steel Equipment Manufacturing Co Ltd
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Zhongyuan Special Steel Co Ltd
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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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C21C5/005—Manufacture of stainless steel
    • 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
    • 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
    • C21C7/072—Treatment with gases
    • 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
    • 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
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • 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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Abstract

The invention belongs to steelmaking technical field, it is related to a kind of nitrogenous steel smelting process, selected dispensing, control harmful element [As], [Sn], [Pb], [Sb], the content of [Bi] is ≤0.015%, [As]+[Sn]+[Pb]+[Sb]+[Bi]≤0.04%, the smelting process that AOD furnace smelting LF stove refines vacuum tank degasification LF stove secondary smeltings is smelted by electric arc furnace smelting intermediate frequency furnace, nitrogen in steel content is improved by being passed through nitrogen in AOD smelting processes, it may replace and rejoin chromium nitride after vacuum outgas to adjust nitrogen content.The present invention adds the gap solution strengthening of N formation nitrogen, with V and Nb formation carbonitride precipitates dispersion-strengthernings, so as to the new Ascalloy developed, this steel grade is new 9Cr Ascalloys, is to realize ultra supercritical coal-fired unit main steam temperature from 600 DEG C to one of critical material of 620 DEG C of transition.

Description

A kind of nitrogenous steel smelting process
Technical field
The invention belongs to steelmaking technical field, it is related to a kind of nitrogenous steel smelting process.
Background technology
P92 steel is new 9Cr Ascalloys, is to realize ultra supercritical coal-fired unit main steam temperature by 600 DEG C to one of critical material of 620 DEG C of transition.After ultra supercritical coal-fired unit steam parameter is more than 600 DEG C/25MPa, main steam There is higher tensile strength, high temperature creep-resisting and high oxidation and corrosion resistance with material requirements with reheaing steam pipe, it is existing P91 steel can not meet this requirement, it is necessary to use P92 steel；The control of P92 steel nitrogen contents is typically after molten steel vacuum outgas Chromium nitride is added, the duration of heat is long, the easy air-breathing of molten steel.
The content of the invention
A kind of production technology is provided through Zico it is an object of the invention to overcome above-mentioned the deficiencies in the prior art The nitrogenous steel smelting process for the product quality stabilization learned and produced.
To achieve these goals, the present invention is adopted the following technical scheme that：A kind of nitrogenous steel smelting process, the technique includes Following steps：
（1）, selected dispensing, control harmful element [As], [Sn], [Pb], [Sb], [Bi] content≤0.015%, [As]+ [Sn]+[Pb]+[Sb]+[Bi]≤0.04%；
（2）, electric arc furnace smelting：Control terminal [C] >=0.10%, [P]≤0.004%, tapping temperature >=1640 DEG C, tapping 1/4~ 1~3kg/t of aluminium block, 2~3kg/t of 1~2kg/t of carburant and lime are added with steel stream during 3/4, is not allowed plus ferrosilicon；
（3）, intermediate frequency furnace smelt：Any one in the low-phosphorous material head of high chromium, high carbon ferro-chrome and molybdenum-iron, any two or three are put into Melted in intermediate frequency furnace, add 1~1.5kg/t of Ca-Si powder to carry out carrying out choosing slag operation before deoxidation, tapping to clinker before tapping, Only tapping is not slagged tap, [P]≤0.02%, temperature >=1640 DEG C, is met and is poured into AOD after coordinating tapping with electric arc furnaces after tapping condition In stove；
（4）, AOD furnace smelt：Convert and add 400~600kg of lime before steel in AOD furnace in baking temperature >=900 DEG C, stove in advance, convert 1~2 minute thermometric is stirred after steel, entered using nitrogen add 2000 in automatic blowing pattern, converting process as needed~ 4000kg lime and alloy；When carbon content≤0.04%, temperature >=1650 DEG C, 10~16kg/t of ferrosilicon or silicomanganese, nitrogen blowing are added Reduction 5~8 minutes；Lime about 300~800kg, fluorite about 150 are rejoined after thermometric, sampling, the clinker for removing more than 50% ~400kg, aluminium block 40~100kg slag making deoxidation, desulfurization；Temperature >=1580 DEG C tap, taken before tapping glass tube sample analyze [H], [O], [N] gas content, then turns the refining of LF stoves；
（5）, LF stoves refining：Connection argon gas power transmission after LF ladle refining furnaces is transferred to, 2~4kg/ of ferrosilicon powder or silicon calcium powder is during which added T carries out deoxidation, and internal control composition accurate adjustment chemical composition is pressed in temperature >=1560 DEG C sampling after slag is white, wherein [Cr] is by 8.0~8.5% controls System, 1650~1660 DEG C of bull ladles of temperature are deaerated into vacuum tank, and glass tube sample lab for analysis of gas content is taken before bull ladle；
（6）, vacuum tank degasification：Ladle hangs in thermometric after vacuum tank, connects nitrogen, the retention time under vacuum≤0.7mbar >=15 minutes, adjustment nitrogen pressure >=0.25MPa, flow 250NL/min after sky are broken, nitrogen blowing 0~20 minute, afterwards lift is covered, It is online to determine hydrogen, [H]≤1.5ppm is controlled, takes gas sample to analyze [O], [N] content；
（7）, LF stove secondary smeltings：Ladle is hung into back LF ladle refining furnaces after degasification, argon gas is connected, is contained according to the nitrogen analyzed Amount, is according to target worth adjustment [N], [Cr] composition, and alloy adds bull ladle behind rear argon gas low discharge stirring, weak mixing time >=10 minute Pour steel.
When smelting ultra supercritical high-pressure boiler pipe steel, its chemical component weight percentage is as follows：C：0.06-0.15%、 Mn≤0.60%, Si≤0.40%, Cr：8.00-10.0%, Mo：0.40-0.60%, Ni≤0.40%, V：0.15- 0.35%th, W：1.5-1.80% and N：0.03-0.10%, surplus is iron, can also contain one or more kinds of following weight The composition of content：Nb≤0.10%, B≤0.01%.
Smelt ultra supercritical high-pressure boiler pipe is with each element percentage by weight optimal selection during steel：C：0.08- 0.13%、Mn：0.40~0.60%, Si≤0.30%, Cr：8.50-9.50%, Mo：0.45-0.55%, V：0.20- 0.30%th, W：1.7-1.80% and N：0.05-0.10%.
The low-phosphorous material head of the high chromium of intermediate frequency furnace raw material selection, ferrochrome, molybdenum-iron and vanadium iron, the steel alloy that intermediate frequency furnace is melted Water is blended into AOD furnace and refined in the lump with electric furnace molten steel, and steel is blended into after entering automatic blowing pattern, finishing blowing using nitrogen The refining of bag stove, heating, adjust temperature, plus lime, fluorite the adjustment quantity of slag, finely tune alloy, adjust basicity of slag（R）2.0~3.0.
Vacuum pot bottom is passed through nitrogen and molten steel is stirred, retention time >=15 point under vacuum≤0.70mbar It is online after clock, broken sky to determine hydrogen, determine oxygen, thermometric, detection composition, then molten steel composition is micro-adjusted, met after requiring Middle bull ladle casting.
The good effect that technical scheme is produced is as follows：Ultra supercritical coal-fired unit steam parameter more than 600 DEG C/ After 25MPa, main steam and reheaing steam pipe have higher tensile strength, high temperature creep-resisting and anti-oxidant corruption with material requirements Corrosion energy, existing P91 steel can not meet this requirement, by being optimized to its composition, nitrogenous steel smelter of the invention Skill suitably reduces Mo content and adds W, forms the W-Mo compound solid solutions reinforcing based on W, adds the gap solid solution of N formation nitrogen Reinforcing, carbonitride precipitates dispersion-strengtherning is formed with V and Nb, so that the new Ascalloy developed, P92 steel is new 9Cr Ascalloys, are to realize ultra supercritical coal-fired unit main steam temperature from 600 DEG C of crucial materials to 620 DEG C of transition One of material, to improve 625-650C high-temperature instantaneous intensity and long-term persistence energy, V, Nb and N and the control of V/N ratios are wherein crucial One of, so the tiny MX phase of moderate number is can ensure that under forging heat treatment condition and tiny uniform in suitable smelt Secondary MX phases, B and N exist favourable to high-temperature behavior with solution.
Nitrogen in steel content is improved by being passed through nitrogen in AOD smelting processes, may replace and rejoined after vacuum outgas Chromium nitride adjusts nitrogen content.The present invention adds the gap solution strengthening of N formation nitrogen, with V and Nb formation carbonitride precipitates more Reinforcing is dissipated, so that the new Ascalloy developed, this steel grade is new 9Cr Ascalloys, it is that realization is super Critical fired power generating unit main steam temperature is from 600 DEG C to one of critical material of 620 DEG C of transition.
In dispensing from the raw material such as high-quality steel scrap, high duty pig iron, sponge iron, particularly control As therein, Sn, The objectionable impurities content such as Pb, Sb, Bi, substantially increases Molten Steel Cleanliness, so as to can further improve superpressure boiler steel Service life；Only tap and do not slag tap during arc furnace tapping, effectively prevent slag steel reinforced concrete refunds phosphorus in tapping process.
Embodiment
Illustrate technical scheme, but protection scope of the present invention not limited to this with specific embodiment below.
A kind of nitrogenous steel smelting process, smelts ultra supercritical high-pressure boiler pipe steel, comprises the following steps：(1) smelt With raw material selection high-quality steel scrap, high duty pig iron, sponge iron, control [As], [Sn], [Pb], [Sb], [Bi] of raw material≤ 0.015%, As+Sn+Pb+Sb+Bi≤0.04%；Chemical component weight percentage composition is as follows in raw material：C 0.06-0.15%、Mn ≤ 0.60%, Si≤0.40%, Cr 8.00-10.0%, Mo 0.40-0.60%, Ni≤0.40%, V 0.15-0.35%, W 1.5-1.80%, N 0.03-0.10%, surplus are iron, can also containing one or more kinds of following weight contents into Point：Nb≤0.10%, B≤0.01%；（2）During electric arc furnace smelting, dephosphorization, heating, decarburization, degassing according to a conventional method goes to be mingled with, Electric furnace steel tapping, which is only tapped, does not slag tap, [C] >=0.10%, [P]≤0.004%, temperature >=1640 DEG C；（3）Arc furnace tapping 1/4~3/ Aluminium block 1.5kg/t, carburant 1.0kg/t and lime 2.5kg/t are added during 4 in ladle, ferrosilicon is not added with；（4）High chromium is low Phosphorus material head, high carbon ferro-chrome, molybdenum-iron, which are put into intermediate frequency furnace, to be melted, and adds Ca-Si powder 1.5kg/t to take off clinker before tapping Oxygen, temperature >=1640 DEG C meet and poured into after coordinating tapping with electric arc furnaces after tapping condition in AOD furnace；（5）, convert before steel in AOD furnace Temperature should be >=900 DEG C, add 400~600kg of lime in stove in advance, convert 1~2 minute thermometric of stirring after steel, entered using nitrogen Automatic blowing pattern.2000~4000kg of lime is added in converting process as needed；Carbon content≤0.04%, temperature >=1650 DEG C when, add silicomanganese 12kg/t, nitrogen blowing reduce 5~8 minutes；Rejoined after thermometric, sampling, the clinker for removing more than 50% Lime about 500kg, fluorite about 200kg, aluminium block 80kg slag making deoxidation, desulfurization；Temperature >=1580 DEG C are tapped, and glass tube is taken before tapping Sample lab for analysis of gas content, controls the content 0.05~0.10% of [N];（6）, be transferred to after LF ladle refining furnaces connection argon gas power transmission, phase Between add ferrosilicon powder or silicon calcium powder~3kg/t and carry out deoxidation, temperature >=1560 DEG C sampling is by internal control composition accurate adjustment chemistry after slag is white Composition, wherein [Cr] is by 8.0~8.5% adjustment, 1650~1660 DEG C of bull ladles of temperature are deaerated into vacuum tank, and glass is taken before bull ladle Pipe sample lab for analysis of gas content, controls the content 0.05~0.10% of [N];（7）, ladle hang in thermometric after vacuum tank, connect nitrogen, Retention time >=15 minute under vacuum≤0.7mbar, break adjustment nitrogen pressure >=0.25MPa, flow 250NL/ after sky Min, nitrogen blowing 0~20 minute, lift lid, determines hydrogen online afterwards, controls [H]≤1.5ppm, takes gas sample to analyze [O], [N] and contains Amount, controls [O]≤30ppm, controls [N] 0.04~0.07%；（8）, ladle hangs back to LF ladle refining furnaces again, connect argon gas, According to the nitrogen content analyzed, chromium component is adjusted with micro- chromium if [N] 0.04~0.07%, if [N] content be unsatisfactory for 0.04~ 0.07%, then Cr, N composition are adjusted with low nitrogen chromium nitride, alloy is hung after all adding rear weak mixing time >=10 minute of argon gas rill Bag is molded into steel ingot.
The present invention is taken in terms of nitrogen content is controlled and blown in AOD furnace using nitrogen instead of argon gas, is removed in vacuum Replace Argon to carry out vacuum refining with nitrogen flushing again during gas, nitrogen content after VD is entered claimed range substantially, without again with nitridation Chromium adjusts nitrogen content.Carried out three groups of smeltings using the technique of the present embodiment, each element weight percent of three groups of smeltings and Cr equivalents are as shown in following table：
The ultra supercritical high-pressure boiler pipe steel that the present embodiment is smelted, chromium equivalent is not less than 10, and ferrite is strict controlled in Within 1.0%C, steady quality, its production technology is more economical, science.

Claims (5)

1. a kind of nitrogenous steel smelting process, it is characterised in that：The technique comprises the following steps：
（1）, selected dispensing, control harmful element [As], [Sn], [Pb], [Sb], [Bi] content≤0.015%, [As]+ [Sn]+[Pb]+[Sb]+[Bi]≤0.04%；
（2）, electric arc furnace smelting：Control terminal [C] >=0.10%, [P]≤0.004%, tapping temperature >=1640 DEG C, tapping 1/4~ 1~3kg/t of aluminium block, 2~3kg/t of 1~2kg/t of carburant and lime are added with steel stream during 3/4, is not allowed plus ferrosilicon；
（3）, intermediate frequency furnace smelt：Any one in the low-phosphorous material head of high chromium, high carbon ferro-chrome and molybdenum-iron, any two or three are put into Melted in intermediate frequency furnace, add 1~1.5kg/t of Ca-Si powder to carry out carrying out choosing slag operation before deoxidation, tapping to clinker before tapping, Only tapping is not slagged tap, [P]≤0.02%, temperature >=1640 DEG C, is met and is poured into AOD after coordinating tapping with electric arc furnaces after tapping condition In stove；
（4）, AOD furnace smelt：Convert and add 400~600kg of lime before steel in AOD furnace in baking temperature >=900 DEG C, stove in advance, convert 1~2 minute thermometric is stirred after steel, entered using nitrogen add 2000 in automatic blowing pattern, converting process as needed~ 4000kg lime and alloy；When carbon content≤0.04%, temperature >=1650 DEG C, 10~16kg/t of ferrosilicon or silicomanganese, nitrogen blowing are added Reduction 5~8 minutes；Lime about 300~800kg, fluorite about 150 are rejoined after thermometric, sampling, the clinker for removing more than 50% ~400kg, aluminium block 40~100kg slag making deoxidation, desulfurization；Temperature >=1580 DEG C tap, taken before tapping glass tube sample analyze [H], [O], [N] gas content, then turns the refining of LF stoves；
（5）, LF stoves refining：Connection argon gas power transmission after LF ladle refining furnaces is transferred to, 2~4kg/ of ferrosilicon powder or silicon calcium powder is during which added T carries out deoxidation, and internal control composition accurate adjustment chemical composition is pressed in temperature >=1560 DEG C sampling after slag is white, wherein [Cr] is by 8.0~8.5% controls System, 1650~1660 DEG C of bull ladles of temperature are deaerated into vacuum tank, and glass tube sample lab for analysis of gas content is taken before bull ladle；
（6）, vacuum tank degasification：Ladle hangs in thermometric after vacuum tank, connects nitrogen, the retention time under vacuum≤0.7mbar >=15 minutes, adjustment nitrogen pressure >=0.25MPa, flow 250NL/min after sky are broken, nitrogen blowing 0~20 minute, afterwards lift is covered, It is online to determine hydrogen, [H]≤1.5ppm is controlled, takes gas sample to analyze [O], [N] content；
（7）, LF stove secondary smeltings：Ladle is hung into back LF ladle refining furnaces after degasification, argon gas is connected, is contained according to the nitrogen analyzed Amount, is according to target worth adjustment [N], [Cr] composition, and alloy adds bull ladle behind rear argon gas low discharge stirring, weak mixing time >=10 minute Pour steel.
2. a kind of nitrogenous steel smelting process according to claim 1, it is characterised in that：Smelt ultra supercritical high-pressure boiler tube During base steel, its chemical component weight percentage is as follows：C：0.06-0.15%, Mn≤0.60%, Si≤0.40%, Cr： 8.00-10.0%, Mo：0.40-0.60%, Ni≤0.40%, V：0.15-0.35%, W：1.5-1.80% and N：0.03- 0.10%, surplus is iron, can also contain the composition of one or more kinds of following weight contents：Nb≤0.10%, B≤ 0.01%.
3. a kind of nitrogenous steel smelting process according to claim 2, it is characterised in that：Smelt ultra supercritical high-pressure boiler tube Base is with each element percentage by weight optimal selection during steel：C：0.08-0.13%、Mn：0.40~0.60%, Si≤0.30%, Cr：8.50-9.50%, Mo：0.45-0.55%, V：0.20-0.30%, W：1.7-1.80% and N：0.05-0.10%.
4. a kind of nitrogenous steel smelting process according to claim 1, it is characterised in that：The high chromium of intermediate frequency furnace raw material selection is low Phosphorus material head, ferrochrome, molybdenum-iron and vanadium iron, the alloy molten steel that intermediate frequency furnace melts is blended into AOD furnace in the lump with electric furnace molten steel Row refining, is blended into ladle furnace refining, heating after entering automatic blowing pattern, finishing blowing using nitrogen, adjusts temperature, plus stone Ash, the fluorite adjustment quantity of slag, finely tune alloy, adjust basicity of slag（R）2.0~3.0.
5. a kind of nitrogenous steel smelting process according to claim 1, it is characterised in that：Vacuum pot bottom is passed through nitrogen to steel Liquid is stirred, retention time >=15 minute under vacuum≤0.70mbar, is determined hydrogen online after broken sky, is determined oxygen, thermometric, detection Composition, then molten steel composition is micro-adjusted, and meeting can middle bull ladle casting after requiring.
CN201710355967.5A 2017-05-16 2017-05-16 A kind of nitrogenous steel smelting process Pending CN107287502A (en)

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Cited By (13)

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CN107829029A (en) * 2017-11-10 2018-03-23 洛阳双瑞特种装备有限公司 A kind of ZG022Cr22Ni5Mo3N materials two phase stainless steel smelting process method
CN109440011A (en) * 2018-12-27 2019-03-08 攀钢集团江油长城特殊钢有限公司 A kind of nitrogenous welding wire steel of vacuum induction furnace smelting low-alloy and its smelting process
CN109457169A (en) * 2018-12-25 2019-03-12 烟台台海玛努尔核电设备有限公司 A kind of smelting process of P91 steel
CN109837360A (en) * 2017-11-28 2019-06-04 上海电气上重铸锻有限公司 The smelting process of steel
CN110343815A (en) * 2018-04-08 2019-10-18 吉林常春高氮合金研发中心有限公司 A method of improving useless high nitrogen steel mechanical property
CN110629110A (en) * 2018-06-25 2019-12-31 宝山钢铁股份有限公司 Steel for ultra-supercritical thermal power generating unit with steam corrosion oxidation resistance and good high-temperature durability and preparation method thereof
CN111304520A (en) * 2020-03-30 2020-06-19 共享铸钢有限公司 Method for smelting CB2 material by electric arc furnace
CN112029961A (en) * 2020-09-10 2020-12-04 东北大学 Aluminum deoxidation method for nitrogen-containing super stainless steel
CN112481551A (en) * 2020-11-04 2021-03-12 河南中原特钢装备制造有限公司 Steel WB36V for power station and smelting continuous casting production process thereof
CN113106322A (en) * 2021-04-22 2021-07-13 安徽富凯特材有限公司 Smelting method of ultrapure ferrite stainless steel
CN114000052A (en) * 2021-10-13 2022-02-01 河南中原特钢装备制造有限公司 Steel P92 die casting round ingot for high-pressure boiler pipe and smelting process thereof
CN114032354A (en) * 2021-11-19 2022-02-11 河南中原特钢装备制造有限公司 Smelting process for improving low-temperature impact energy of 32CrNi3MoVE steel
CN115522115A (en) * 2022-03-17 2022-12-27 河南中原特钢装备制造有限公司 Process for smelting P92 steel for ultra-supercritical high-pressure boiler by using argon-oxygen furnace

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CN106636953A (en) * 2016-10-14 2017-05-10 中原特钢股份有限公司 Method for smelting martensitic stainless steel P91 for boiler pipe
CN106624416A (en) * 2016-08-31 2017-05-10 中国大唐集团科学技术研究院有限公司 Method for improving structure and performance of T92 steel welding joint and T92 steel welding joint

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CN104043672A (en) * 2014-04-10 2014-09-17 内蒙古北方重工业集团有限公司 Manufacturing method of high-quality P92 large-aperture thick-wall seamless steel pipe of ultra-supercritical unit
CN106624416A (en) * 2016-08-31 2017-05-10 中国大唐集团科学技术研究院有限公司 Method for improving structure and performance of T92 steel welding joint and T92 steel welding joint
CN106636953A (en) * 2016-10-14 2017-05-10 中原特钢股份有限公司 Method for smelting martensitic stainless steel P91 for boiler pipe

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107829029A (en) * 2017-11-10 2018-03-23 洛阳双瑞特种装备有限公司 A kind of ZG022Cr22Ni5Mo3N materials two phase stainless steel smelting process method
CN109837360A (en) * 2017-11-28 2019-06-04 上海电气上重铸锻有限公司 The smelting process of steel
CN110343815A (en) * 2018-04-08 2019-10-18 吉林常春高氮合金研发中心有限公司 A method of improving useless high nitrogen steel mechanical property
CN110629110A (en) * 2018-06-25 2019-12-31 宝山钢铁股份有限公司 Steel for ultra-supercritical thermal power generating unit with steam corrosion oxidation resistance and good high-temperature durability and preparation method thereof
CN109457169A (en) * 2018-12-25 2019-03-12 烟台台海玛努尔核电设备有限公司 A kind of smelting process of P91 steel
CN109440011A (en) * 2018-12-27 2019-03-08 攀钢集团江油长城特殊钢有限公司 A kind of nitrogenous welding wire steel of vacuum induction furnace smelting low-alloy and its smelting process
CN111304520B (en) * 2020-03-30 2021-10-26 共享铸钢有限公司 Method for smelting CB2 material by electric arc furnace
CN111304520A (en) * 2020-03-30 2020-06-19 共享铸钢有限公司 Method for smelting CB2 material by electric arc furnace
CN112029961A (en) * 2020-09-10 2020-12-04 东北大学 Aluminum deoxidation method for nitrogen-containing super stainless steel
CN112481551A (en) * 2020-11-04 2021-03-12 河南中原特钢装备制造有限公司 Steel WB36V for power station and smelting continuous casting production process thereof
CN112481551B (en) * 2020-11-04 2022-05-03 河南中原特钢装备制造有限公司 Steel WB36V for power station and smelting and continuous casting production process thereof
CN113106322A (en) * 2021-04-22 2021-07-13 安徽富凯特材有限公司 Smelting method of ultrapure ferrite stainless steel
CN113106322B (en) * 2021-04-22 2022-01-28 安徽富凯特材有限公司 Smelting method of ultrapure ferrite stainless steel
CN114000052A (en) * 2021-10-13 2022-02-01 河南中原特钢装备制造有限公司 Steel P92 die casting round ingot for high-pressure boiler pipe and smelting process thereof
CN114032354A (en) * 2021-11-19 2022-02-11 河南中原特钢装备制造有限公司 Smelting process for improving low-temperature impact energy of 32CrNi3MoVE steel
CN114032354B (en) * 2021-11-19 2023-02-03 河南中原特钢装备制造有限公司 Smelting process for improving low-temperature impact energy of 32CrNi3MoVE steel
CN115522115A (en) * 2022-03-17 2022-12-27 河南中原特钢装备制造有限公司 Process for smelting P92 steel for ultra-supercritical high-pressure boiler by using argon-oxygen furnace

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