CN105803150A - Method for controlling blank casting quality of phi-280mm Cr-Mo series circular tube blank - Google Patents
Method for controlling blank casting quality of phi-280mm Cr-Mo series circular tube blank Download PDFInfo
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- CN105803150A CN105803150A CN201610171547.7A CN201610171547A CN105803150A CN 105803150 A CN105803150 A CN 105803150A CN 201610171547 A CN201610171547 A CN 201610171547A CN 105803150 A CN105803150 A CN 105803150A
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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
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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
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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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
-
- 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
- B22D11/18—Controlling or regulating processes or operations for pouring
-
- 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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
-
- 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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
-
- 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
-
- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- 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
Abstract
The invention discloses a method for controlling the internal quality of a Cr-Mo series circular tube steel casting blank with a phi-280mm production section, and belongs to the field of metallurgy. The method comprises the steps such as smelting in a converter, molten steel refining in an LF furnace, RH refining, and continuous casting of molten steel. First of all, the purity of the molten steel is improved according to reasonable parameter control in the molten steel smelting stage, and the high-temperature plasticity of the molten steel is improved and the steel grade crack sensitivity is lowered after the molten steel is subjected to titanium micro-alloying; and then, mold electromagnetic stirring and final electromagnetic stirring are combined in the molten steel pouring stage, so that component and temperature homogenization of the molten steel can be achieved, the shell of the circular tube steel casting blank can grow uniformly, the solidification structure of the circular tube steel casting blank can be effectively improved, the loose level can be raised, the area of an equiaxial crystal region can be enlarged, the compactness of the central region of the circular tube steel casting blank can be effectively improved, the crack defect of the circular tube steel casting blank can be effectively controlled, the surface non-clearing rate can be improved, and the quality of such a rolled product can be controlled well and stably.
Description
Technical field
The present invention relates to field of steel metallurgy, particularly relate to and a kind of produce the chrome molybdenum series circular pipe blank slab quality control method that yardstick section is φ 280mm.
Background technology
The steel for oil well pipes that chrome molybdenum series tube blank steel uses mainly for the production of oil-gas mining, transport, in use under the combined effect of applied stress and hydrogen sulfide gas, often there is suddenly brittle failure (being called H 2 S stress corrosion) when stress is far below itself yield strength, often result in the problems such as raw leakage, production and environmental protection are adversely affected.Along with socioeconomic development, oil gas transport efficiency requirements is higher, exploit the development trends such as difficulty increase constantly proposes harsher requirement to slab quality.Especially such as defects such as strand center porosity, center segregations, strand is rolled poling processing and end product quality has a negative impact.
Continuous casting billet center segregation and loose generation, mainly due to casting blank solidification heat transfer high directivity in continuous casting production process, cause that column crystal is excessively flourishing, and solidification of molten steel process solute element to solidify position solute alloy element concentration after the reallocation that solid-liquid is alternate causes strand relatively higher；Furthermore, the prosperity of column crystal causes that the process of setting forming core crystallization of strand center is uneven, and dense structure's property declines, and solidification terminates rear solidification of molten steel and shrinks formation rarefaction defect.The center segregation, the center porosity that are formed can not all effectively eliminate in subsequent heat rolling process, affect product quality.For chrome molybdenum series tube blank steel, the composition strand column crystal that determines to know clearly itself is more flourishing, and center porosity trend is bigger, and center segregation tendency increases.Furthermore, owing to casting blank section is relatively large and for justifying base, its specific surface area less strand heat transfer efficiency is lower, and the control of Inner Quality of Billet is more difficult.
Summary of the invention
For overcome existing compared with the chrome molybdenum series pipe steel Inner Quality of Billet of big cross section size generally relatively low, easily occur that the deficiencies such as crackle, the technical problem to be solved are: provide a kind of for the chrome molybdenum series pipe steel strand that cross dimensions is φ 280mm strengthen its internal soundness control method.
The technical solution adopted for the present invention to solve the technical problems is:
The chrome molybdenum series circular pipe blank slab quality control method of φ 280mm, it is characterised in that comprise the following steps:
I, converter smelting: converter terminal carbon is controlled according to mass percent 0.05%～0.15%, outlet temperature >=1670 DEG C control, chain-wales is fed by the feed quantity of steel 1.4～2.0m per ton and is added aluminum steel, carry out deoxidation treatment, chain-wales target component is by mass percentage: [C] 0.20%～0.35%, [Si] 0.16%～0.30%, [Mn] 1.00%～1.40%, [P]≤0.013% control, and deoxidation alloying terminates the laggard soft blow argon walking to few 3min and processes；
II, LF stove refined molten steel: the molten steel obtained in step I is carried out LF stove refine, refine whole process Argon stirs, refine adds titanium alloy material latter stage, addition by the 0.018%～0.038% of molten steel weight carry out with addition of, carry out the feed quantity of 200～500m afterwards to feed and add silicon-calcium wire and carry out Calcium treatment, in wherein, bag the first heat is fed by the upper limit and is added, and refine continues Argon after terminating and stirs at least 5min, and out-station temperature presses 1560～1620 DEG C of controls；
III, RH refine: the molten steel obtained in step II is carried out RH refine, RH refine requires that argon flow amount controls by 1150～1450NL/min, vacuum < 3mbar, process time >=10min, RH sets off Alt mass percent according to 0.030%～0.055% control, application of vacuum continues Argon at least 5min after terminating, and out-station temperature presses 1550～1580 DEG C of controls；
IV, continuous casting steel: continuous casting link adopts the mode that M-EMS combines with solidification end electromagnetic agitation, and wherein, the parameter of M-EMS is: stir current 200～350A, 2～4Hz；Solidification end stirring parameter is: stir current 100～150A, frequency 4.0～7.0Hz.
Further, step I, in II and III smelting process adopt in the stirring of intensity Argon, occur without with molten steel surface and turn over greatly boiling and be as the criterion；Smelting adopts the stirring of soft blow argon after terminating, make molten steel have faint stirring.
It is further, also need in step IV carries out molten steel cast control following parameter: the degree of superheat controls at 25～38 DEG C, casting speed control is at 0.60～1.20m/min, and crystallizer cooling controls at 2400～2500L/min, and two cold specific waters control at 0.21～0.33/kgSteel。
The invention has the beneficial effects as follows: first in the smelting molten steel stage according to rational state modulator, improve the degree of purity of molten steel, and by molten steel is carried out Trace Titanium Treatment, improve its high-temp plastic, reduce steel grade crack sensitivity, in the process of pouring molten steel, adopt the mode that M-EMS combines with solidification end electromagnetic agitation, make molten steel component and equalizing temperature, green shell homoepitaxial, casting blank solidification tissue is effectively improved, loose grading improves, equiax crystal region area expands, circle base central area compactness effectively improves, strand crack defect is effectively controlled, surface obtains improving without cleaning rate and improves, mill bar quality controls good and stable.
Detailed description of the invention
Below by way of detailed description of the invention, the invention will be further described, but should not be understood as the restriction of the present invention.Those of ordinary skill in the art are according to such scheme, it is also possible to make various forms of amendment, replacement, change.Every amendment, replacement and change made based on above-mentioned technological thought broadly falls into the scope of the present invention.
The chrome molybdenum series circular pipe blank slab quality control method of φ 280mm, it is characterised in that comprise the following steps:
I, converter smelting: converter terminal carbon is controlled according to mass percent 0.05%～0.15%, outlet temperature >=1670 DEG C control, chain-wales is fed by the feed quantity of steel 1.4～2.0m per ton and is added aluminum steel, carry out deoxidation treatment, chain-wales target component is by mass percentage: [C] 0.20%～0.35%, [Si] 0.16%～0.30%, [Mn] 1.00%～1.40%, [P]≤0.013% control, and deoxidation alloying terminates the laggard soft blow argon walking to few 3min and processes；
II, LF stove refined molten steel: the molten steel obtained in step I is carried out LF stove refine, refine whole process Argon stirs, refine adds titanium alloy material latter stage, addition by the 0.018%～0.038% of molten steel weight carry out with addition of, carry out the feed quantity of 200～500m afterwards to feed and add silicon-calcium wire and carry out Calcium treatment, in wherein, bag the first heat is fed by the upper limit and is added, and refine continues Argon after terminating and stirs at least 5min, and out-station temperature presses 1560～1620 DEG C of controls；
III, RH refine: the molten steel obtained in step II is carried out RH refine, RH refine requires that argon flow amount controls by 1150～1450NL/min, vacuum < 3mbar, process time >=10min, RH sets off Alt according to mass percent 0.030%～0.055% control, application of vacuum continues Argon at least 5min after terminating, and out-station temperature presses 1550～1580 DEG C of controls；
IV, continuous casting steel: continuous casting link adopts the mode that M-EMS combines with solidification end electromagnetic agitation, and wherein, the parameter of M-EMS is: stir current 200～350A, 2～4Hz；Solidification end stirring parameter is: stir current 100～150A, frequency 4.0～7.0Hz.
Step I, II and III mainly the smelting of molten steel is controlled, it is ensured that molten steel has stable characteristic, uniform composition and suitable pouring temperature before cast.Wherein, converter steelmaking process mainly carries out deoxidation treatment, and add and control alloying elements, to ensure the internal soundness of molten steel, improving its stability, LF stove refine is to make molten steel fully react, and removes unnecessary impurity, improve the degree of purity of molten steel, and make the composition stable and uniform more of molten steel.
The present invention it is critical only that the continuous casting steel stage in step IV, it is generally the case that in continuous casting process, casting blank solidification tissue presents the crystallizer tissue regions in chill fine grained region, columnar zone, Center Equiaxial Crystal district successively from casting billet surface to center.For improving slab quality, improving Inner Quality of Billet, current metallurgy industry is generally adopted by electromagnetic agitating technology and solidification end Reduction Technology, and the effect that two kinds of technology reach is all not ideal enough.The present invention thes improvement is that, employing is the mode that combines with solidification end electromagnetic agitation of M-EMS.The mechanism of action of this technology is: M-EMS produces electromagnetic torque by magnetic field, change crystallizer internal flow field of molten steel, thermo parameters method situation, promote Mold composition, equalizing temperature, weaken the directivity of solidification and heat transfer, promote green shell homoepitaxial；Further, fusing, by forcing to drive the flowing of mushy zone molten steel, is washed away by solidification end electromagnetic agitation by columanar structure, improves equiax crystal nucleation rate, it is suppressed that column crystal grows, and makes isometry crystalline region expand, improves Inner Quality of Billet.
Converter smelting, LF stove refine and RH vacuum process all adopt Argon to be stirred, intensity Argon stirring in being generally adopted in smelting process, occur without with molten steel surface and turn over greatly boiling and be as the criterion；Smelting adopts the stirring of soft blow argon after terminating, make molten steel have faint stirring.Argon stirring is primarily to and enables molten steel fully to react, and makes the composition mix homogeneously in molten steel, it is simple to follow-up can form stable solidified structure in pouring molten steel process.
Further, when carrying out the continuous casting steel stage, if solidification end electromagnetic agitation intensity controls bad, easily cause dentrite tip and wash away seriously, the low solute concentration molten steel causing the strong mobility of low melting point is assembled ringwise, form white band, it is thus desirable to its stirring intensity is accurately controlled, in addition in order to ensure last quality of becoming a useful person, also need to control following parameter when carrying out molten steel cast: the degree of superheat controls at 25～38 DEG C, casting speed control is at 0.60～1.20m/min, crystallizer cooling controls at 2400～2500L/min, two cold specific waters control at 0.21～0.33/kgSteel.The rational degree of superheat, pulling rate match control and intensity of secondary cooling formulate the key being casting blank solidification heat transfer is controlled, the key that namely strand center mass controls.
Embodiment one:
Certain steel mill adopts 120t converter smelting → LF stove refine → RH refine → six machine six to flow casting machine φ 280mm section continuous casting and produces 30CrMo series circular pipe blank.When bessemerizing end, aim carbon is 0.10% be controlled, and outlet temperature controls at 1675 DEG C；Chain-wales feeds aluminum steel by 1.7m/t steel and carries out deoxidation；Chain-wales departures Ingredient percent controls: [C] 0.28%, [Si] 0.21%, [Mn] 1.25%, [P] 0.011%；Carrying out soft blow argon stirring, mixing time 3.5min after deoxidation alloying, stirring does not occur that molten steel is exposed.
Molten steel arrives LF refining furnace place, carries out Argon molten steel and slightly fluctuates, do not occur turning over greatly phenomenon, after refine terminates, by the 0.026% of molten steel weight with addition of Ti；With addition of after feed and add 400m silicon-calcium wire and carry out Calcium treatment, carried out the soft blow stirring of 7.5min after line feeding, LF out-station temperature is 1585 DEG C.
After molten steel arrives at a station, RH refine Argon argon flow amount is 1300NL/min control, and process time 10min, the RH departures Alt of vacuum < 3mbar is 0.045%, and application of vacuum terminates rear Argon >=6.5min, and out-station temperature controls at 1550 DEG C.
RH refining treatment is allocated and transported after terminating and is flowed casting machine φ 280mm section to six machines six and carry out molten steel casting, and actual control of the critical technical parameter relevant to application claims is: M-EMS: stir current 200A, stirring frequency 3.0Hz；Solidification end electromagnetic agitation: stir current 105A, stirring frequency 7.0Hz；The actual casting process degree of superheat of molten steel controls at 25～32 DEG C；Pulling rate is 1.0m/min；Crystallizer cooling controls at 2500L/min；Two cold specific waters control at 0.33/kg steel.
After above-mentioned technological invention is stably used, slab quality is well controlled, and strand low power testing result is: strand sedimentation 0.5～1.0 grade, non-densified regions diameter proportion 40.2%；The defects such as casting billet surface flawless, casting billet surface comprehensively reaches 99.2% without cleaning rate.Strand in-situ metal analyzes consistency detection, and central area is 0.82, strand equiax crystal section length ratio 50.1%～54.2%；It is 0.96～1.03 that strand bores sample segregation testing result.
Embodiment two:
Certain steel mill adopts 120t converter smelting → LF stove refine → RH refine → six machine six to flow casting machine φ 280mm section continuous casting and produces 35CrMo series circular pipe blank.When bessemerizing end, aim carbon is 0.05% be controlled, and outlet temperature controls at 1680 DEG C；2.0m/t pressed by chain-walesSteelFeeding aluminum steel carries out deoxidation；Chain-wales departures Composition Control is: [C] 0.30%, [Si] 0.18%, [Mn] 1.30%, [P] 0.012%；Carrying out soft blow argon stirring, mixing time 4.0min after deoxidation alloying, stirring does not occur that molten steel is exposed.
Molten steel arrives LF refining furnace place, carries out Argon molten steel and slightly fluctuates, do not occur turning over greatly phenomenon, after refine terminates, by the 0.035% of molten steel weight with addition of Ti；With addition of after feed and add 500m silicon-calcium wire and carry out Calcium treatment, carried out the soft blow stirring of 7.5min after line feeding, LF out-station temperature is 1600 DEG C.
After molten steel arrives at a station, RH refine Argon argon flow amount is 1400NL/min control, and process time 12min, the RH departures Alt of vacuum < 3mbar is 0.050%, and application of vacuum terminates rear Argon 7.5min, and out-station temperature controls at 1570 DEG C.
LF refining treatment is allocated and transported after terminating and is flowed casting machine φ 280mm section to six machines six and carry out molten steel casting, and actual control of the critical technical parameter relevant to application claims is: M-EMS: stir current 260A, stirring frequency 4.0Hz；Solidification end electromagnetic agitation: stir current 110A, stirring frequency 6.5Hz；The actual casting process degree of superheat of molten steel controls at 31～38 DEG C；Pulling rate is 0.7m/min；Crystallizer cooling controls at 2400L/min；Two cold specific waters control at 0.21/kgSteel。
After above-mentioned technological invention is stably used, slab quality is well controlled, and strand low power testing result is: strand sedimentation 0.5～1.0 grade, non-densified regions diameter proportion 41.1%；The defects such as casting billet surface flawless, casting billet surface comprehensively reaches 97.8% without cleaning rate.Strand in-situ metal analyzes consistency detection, and central area is 0.83, strand equiax crystal section length ratio 50.3%～52.2%；It is 0.95～1.04 that strand bores sample segregation testing result.
Claims (3)
1. the chrome molybdenum series circular pipe blank slab quality control method of φ 280mm, it is characterised in that comprise the following steps:
I, converter smelting: converter terminal carbon is controlled according to mass percent 0.05%～0.15%, outlet temperature >=1670 DEG C control, chain-wales is fed by the feed quantity of steel 1.4～2.0m per ton and is added aluminum steel, carry out deoxidation treatment, chain-wales target component is by mass percentage: [C] 0.20%～0.35%, [Si] 0.16%～0.30%, [Mn] 1.00%～1.40%, [P]≤0.013% control, and deoxidation alloying terminates the laggard soft blow argon walking to few 3min and processes；
II, LF stove refined molten steel: the molten steel obtained in step I is carried out LF stove refine, refine whole process Argon stirs, refine adds titanium alloy material latter stage, addition by the 0.018%～0.038% of molten steel weight carry out with addition of, carry out the feed quantity of 200～500m afterwards to feed and add silicon-calcium wire and carry out Calcium treatment, in wherein, bag the first heat is fed by the upper limit and is added, and refine continues Argon after terminating and stirs at least 5min, and out-station temperature presses 1560～1620 DEG C of controls；
III, RH refine: the molten steel obtained in step II is carried out RH refine, RH refine requires that argon flow amount controls by 1150～1450NL/min, vacuum < 3mbar, process time >=10min, RH sets off Alt according to mass percent 0.030%～0.055% control, application of vacuum continues Argon at least 5min after terminating, and out-station temperature presses 1550～1580 DEG C of controls；
IV, continuous casting steel: continuous casting link adopts the mode that M-EMS combines with solidification end electromagnetic agitation, and wherein, the parameter of M-EMS is: stir current 200～350A, 2～4Hz；Solidification end stirring parameter is: stir current 100～150A, frequency 4.0～7.0Hz.
2. the chrome molybdenum series circular pipe blank slab quality control method of φ 280mm as claimed in claim 1, is characterized in that: step I, in II and III smelting process adopt in the stirring of intensity Argon, occur without with molten steel surface and turn over greatly boiling and be as the criterion；Smelting adopts the stirring of soft blow argon after terminating, make molten steel have faint stirring.
3. the chrome molybdenum series circular pipe blank slab quality control method of φ 280mm as claimed in claim 1, it is characterized in that: also need to when carrying out molten steel cast in step III control following parameter: the degree of superheat controls at 25～38 DEG C, casting speed control is at 0.60～1.20m/min, crystallizer cooling controls at 2400～2500L/min, and two cold specific waters control at 0.21～0.33/kgSteel。
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| CN201610171547.7A CN105803150B (en) | 2016-03-23 | 2016-03-23 | The chrome molybdenum series circular pipe blank slab quality control method of φ 280mm |
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| CN108687317A (en) * | 2018-06-29 | 2018-10-23 | 攀钢集团攀枝花钢铁研究院有限公司 | The method that bloom continuous casting produces 42CrMoH steel |
| CN108705050A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | The method that bloom continuous casting produces 34CrMo4 oxygen cylinder steel |
| CN108705055A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | M+F-EMS control method in bloom continuous casting |
| CN114150107A (en) * | 2021-11-26 | 2022-03-08 | 南京钢铁股份有限公司 | Smelting method of spring steel for ultrahigh-strength engineering machinery |
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| CN106513617A (en) * | 2016-12-30 | 2017-03-22 | 中国重型机械研究院股份公司 | Device and method for improving casting blank quality of continuous casting production |
| CN106513617B (en) * | 2016-12-30 | 2019-02-12 | 中国重型机械研究院股份公司 | A kind of device and method improving continuous casting slab quality |
| CN108687317A (en) * | 2018-06-29 | 2018-10-23 | 攀钢集团攀枝花钢铁研究院有限公司 | The method that bloom continuous casting produces 42CrMoH steel |
| CN108705050A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | The method that bloom continuous casting produces 34CrMo4 oxygen cylinder steel |
| CN108705055A (en) * | 2018-06-29 | 2018-10-26 | 攀钢集团攀枝花钢铁研究院有限公司 | M+F-EMS control method in bloom continuous casting |
| CN114150107A (en) * | 2021-11-26 | 2022-03-08 | 南京钢铁股份有限公司 | Smelting method of spring steel for ultrahigh-strength engineering machinery |
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