CN105803150B - The chrome molybdenum series circular pipe blank slab quality control method of φ 280mm - Google Patents
The chrome molybdenum series circular pipe blank slab quality control method of φ 280mm Download PDFInfo
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- CN105803150B CN105803150B CN201610171547.7A CN201610171547A CN105803150B CN 105803150 B CN105803150 B CN 105803150B CN 201610171547 A CN201610171547 A CN 201610171547A CN 105803150 B CN105803150 B CN 105803150B
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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
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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
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Continuous Casting (AREA)
Abstract
Disclosed by the invention is a kind of internal quality control method for producing the chrome molybdenum series pipe steel strand that cross dimensions is φ 280mm of field of metallurgy.This method includes converter smelting, LF stove refined molten steels, RH is refined and continuous casting steel, first, in the smelting molten steel stage according to rational state modulator, improve the degree of purity of molten steel, and by carrying out Trace Titanium Treatment to molten steel, improve its high-temp plastic, reduce steel grade crack sensitivity, then during pouring molten steel, using M-EMS in a manner that solidification end electromagnetic agitation is combined, so that molten steel component and equalizing temperature, green shell homoepitaxial, casting blank solidification tissue is effectively improved, loose grading improves, equiax crystal region area expands, round billet central area compactness effectively improves, strand crack defect is effectively controlled, surface is improved improvement without cleaning rate, mill bar quality control is good and stablizes.
Description
Technical field
The present invention relates to field of steel metallurgy more particularly to a kind of scale section that produces to justify for the chrome molybdenum series of φ 280mm
Pipe slab quality control method.
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, makes when in use
With under the collective effect of stress and hydrogen sulfide gas, brittle failure often occurs suddenly when stress is far below itself yield strength
(being known as H 2 S stress corrosion) often results in raw the problems such as revealing, production and environmental protection is adversely affected.As society passes through
The development of Ji, the development trends such as oil gas conevying efficiency requirement higher, exploitation difficulty increase constantly propose slab quality more severe
The requirement at quarter.Especially such as the defects of strand center porosity, center segregation, strand rolling poling processing and final product quality are generated not
Profit influences.
Continuous casting billet center segregation and loose generation, mainly due to casting blank solidification heat transfer directionality in continuous casting production process
By force, cause column crystal excessively flourishing, and solidification of molten steel process solute element solidifies after the alternate reallocation of solid-liquid causes strand
Position solute alloy element concentration is relatively higher；Furthermore the prosperity of column crystal causes the process of setting forming core crystallization of strand center not
Uniformly, dense structure's property declines, and solidification of molten steel shrinks to form rarefaction defect after solidification.The center segregation that is formed, center
It is loose all to be effectively eliminated in subsequent heat rolling process, influence product quality.For chrome molybdenum series tube blank steel
For, ingredient determines to know clearly in itself, and strand column crystal is more flourishing, and center porosity trend bigger, center segregation tendency increases.Again
Person, since casting blank section is relatively large and is round billet, specific surface area smaller strand heat transfer efficiency is lower, Inner Quality of Billet
Control is more difficult.
The content of the invention
To overcome the chrome molybdenum series pipe steel Inner Quality of Billet of existing larger cross dimensions universal relatively low, easily cracked
The deficiencies of, the technical problems to be solved by the invention are：It provides a kind of for the chrome molybdenum series pipe that cross dimensions is φ 280mm
The control method of its internal soundness of the enhancing of steel strand.
The technical solution adopted by the present invention to solve the technical problems is：
The chrome molybdenum series circular pipe blank slab quality control method of φ 280mm, which is characterized in that comprise the following steps：
Ith, converter smelting：Converter terminal carbon is controlled according to mass percent 0.05%~0.15%, and outlet temperature >=
1670 DEG C control, chain-wales by 1.4~2.0m of steel per ton feed quantity feed plus aluminum steel, carry out deoxidation treatment, chain-wales target into
Divide by mass percentage：[C] 0.20%~0.35%, [Si] 0.16%~0.30%, [Mn] 1.00%~1.40%, [P]≤
0.013% controls, and the soft blow argon processing of at least 3min is carried out after deoxidation alloying；
IIth, LF stoves refined molten steel：The molten steel obtained in step I is subjected to LF stove refinings, refines whole Argon stirring, refining
Latter stage add in titanium alloy material, addition by molten steel weight 0.018%~0.038% carry out with addition of, afterwards carry out 200~500m
Feed quantity feed plus silicon-calcium wire carry out Calcium treatment, wherein it is middle bag the first heat by the upper limit feed plus, after refining continue Argon stir
At least 5min is mixed, out-station temperature is by 1560~1620 DEG C of controls；
IIIth, RH is refined：The molten steel obtained in step II is subjected to RH refinings, RH refinings require argon flow amount by 1150~
1450NL/min is controlled, vacuum degree ＜ 3mbar, processing time >=10min, the outbound Alt mass percents of RH according to 0.030%~
0.055% control continues Argon at least 5min after application of vacuum, out-station temperature is by 1550~1580 DEG C of controls；
IVth, continuous casting steel：Continuous casting link using M-EMS in a manner that solidification end electromagnetic agitation is combined,
Wherein, the parameter of M-EMS is：Stir current 200~350A, 2~4Hz；Solidification end stirring parameter is：
100~150A of stir current, 4.0~7.0Hz of frequency.
It is further that intensity Argon stirs during smelting process uses in step I, II and III, does not occur with molten steel surface
It turns over subject to boiling greatly；It is stirred after smelting using soft blow argon, molten steel is made to have faint agitation.
It is further to carry out also needing to control following parameter when molten steel cast in step IV：The degree of superheat controls
At 25~38 DEG C, casting speed control is in 0.60~1.20m/min, and in 2400~2500L/min, two cold compare water for crystallizer cooling control
Amount control is in 0.21~0.33/kgSteel。
The beneficial effects of the invention are as follows：First molten steel is improved according to rational state modulator in the smelting molten steel stage
Degree of purity, and by carrying out Trace Titanium Treatment to molten steel, improve its high-temp plastic, steel grade crack sensitivity is reduced, in steel
During water is poured into a mould, using M-EMS in a manner that solidification end electromagnetic agitation is combined so that molten steel component
And equalizing temperature, green shell homoepitaxial, casting blank solidification tissue are effectively improved, loose grading improves, equiax crystal area surface
Product expands, round billet central area compactness effectively improves, and strand crack defect is effectively controlled, and surface is obtained without cleaning rate
Improve to improving, mill bar quality control is good and stablizes.
Specific embodiment
Below by way of specific embodiment, 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 can also make various forms of modifications, replace, change according to said program.It is every based on upper
It states modification, replacement and change that technological thought is made and belongs to the scope of the present invention.
The chrome molybdenum series circular pipe blank slab quality control method of φ 280mm, which is characterized in that comprise the following steps：
Ith, converter smelting：Converter terminal carbon is controlled according to mass percent 0.05%~0.15%, and outlet temperature >=
1670 DEG C control, chain-wales by 1.4~2.0m of steel per ton feed quantity feed plus aluminum steel, carry out deoxidation treatment, chain-wales target into
Divide by mass percentage：[C] 0.20%~0.35%, [Si] 0.16%~0.30%, [Mn] 1.00%~1.40%, [P]≤
0.013% controls, and the soft blow argon processing of at least 3min is carried out after deoxidation alloying；
IIth, LF stoves refined molten steel：The molten steel obtained in step I is subjected to LF stove refinings, refines whole Argon stirring, refining
Latter stage add in titanium alloy material, addition by molten steel weight 0.018%~0.038% carry out with addition of, afterwards carry out 200~500m
Feed quantity feed plus silicon-calcium wire carry out Calcium treatment, wherein it is middle bag the first heat by the upper limit feed plus, after refining continue Argon stir
At least 5min is mixed, out-station temperature is by 1560~1620 DEG C of controls；
IIIth, RH is refined：The molten steel obtained in step II is subjected to RH refinings, RH refinings require argon flow amount by 1150~
1450NL/min control, vacuum degree ＜ 3mbar, processing time >=10min, the outbound Alt of RH according to mass percent 0.030%~
0.055% control continues Argon at least 5min after application of vacuum, out-station temperature is by 1550~1580 DEG C of controls；
IVth, continuous casting steel：Continuous casting link using M-EMS in a manner that solidification end electromagnetic agitation is combined,
Wherein, the parameter of M-EMS is：Stir current 200~350A, 2~4Hz；Solidification end stirring parameter is：
100~150A of stir current, 4.0~7.0Hz of frequency.
Step I, II and III mainly control the smelting of molten steel, ensure that molten steel has stable spy before cast
Property, uniform ingredient and appropriate pouring temperature.Wherein, converter steelmaking process mainly carry out deoxidation treatment, and add in and
Alloying elements are controlled, to ensure the internal soundness of molten steel, improve its stability, the refining of LF stoves is to make molten steel fully anti-
Should, and extra impurity is removed, the degree of purity of molten steel is improved, and makes the ingredient more stable and uniform of molten steel.
The key of the present invention is in the continuous casting steel stage in step IV, it is generally the case that strand coagulates in continuous casting process
Gu the crystallizer tissue in chill fine grained region, columnar zone, Center Equiaxial Crystal area is presented from casting billet surface to center successively for tissue
Region.To improve slab quality, Inner Quality of Billet is improved, metallurgy industry is generally adopted by electromagnetic agitating technology and coagulates at present
Gu end Reduction Technology, the effect that two kinds of technologies are reached is all not ideal enough.The present invention's thes improvement is that, using knot
The mode that brilliant device electromagnetic agitation is combined with solidification end electromagnetic agitation.The mechanism of action of the technology is：M-EMS
By magnetic field generate electromagnetic torque, change crystallizer inside flow field of molten steel, thermo parameters method situation, promote Mold into
Divide, equalizing temperature, weaken the directionality of solidification and heat transfer, promote green shell homoepitaxial；Further, solidification end electromagnetic agitation
By forcing the flowing of driving mushy zone molten steel, fusing is washed away to columanar structure, improves equiax crystal nucleation rate, inhibits column crystal
Growth expands isometric crystalline region, improves Inner Quality of Billet.
It is stirred during converter smelting, the refining of LF stoves and RH application of vacuum using Argon, in smelting process
It is general use in intensity Argon stir, being subject to molten steel surface does not occur turning over boiling greatly；It is stirred after smelting using soft blow argon,
Molten steel is made to have faint agitation.Argon is stirred primarily to molten steel is enable fully to react, and mixes the ingredient in molten steel
Uniformly, convenient for stable solidified structure can be formed subsequently during pouring molten steel.
Further, when carrying out the continuous casting steel stage, if the control of solidification end electromagnetic agitation intensity is bad, easily make
It is washed away seriously into dentrite tip, the low solute concentration molten steel of the strong mobility of low melting point is caused to be assembled in a ring, form white band, because
This needs accurately to control its stirring intensity, in addition in order to ensure last quality of becoming a useful person, need to also carry out molten steel cast
When control following parameter：Degree of superheat control is at 25~38 DEG C, and casting speed control is in 0.60~1.20m/min, crystallizer cooling control
In 2400~2500L/min, Water Rate for Secondary Cooling Water is controlled in 0.21~0.33/kgSteel.The rational degree of superheat, pulling rate match control and
Intensity of secondary cooling formulation is the key that conduct heat to control to casting blank solidification, i.e. the key of strand center mass control.
Embodiment one：
Certain steel mill refines → six machines six stream casting machine φ 280mm sections using 120t converter smeltings → LF stoves refining → RH and connects
Casting production 30CrMo series circular pipe blanks.At the end of bessemerizing, aim carbon is controlled for 0.10%, and outlet temperature control exists
1675℃；Chain-wales carry out deoxidation by 1.7m/t steel feeding aluminum steel；The outbound ingredient percent of chain-wales, which controls, is：[C]
0.28%th, [Si] 0.21%, [Mn] 1.25%, [P] 0.011%；Soft blow argon stirring, mixing time are carried out after deoxidation alloying
3.5min, it is exposed that stirring does not occur molten steel.
Molten steel is reached at LF refining furnace, is carried out Argon molten steel and is fluctuated slightly, does not occur turning over phenomenon greatly, after refining, press
The 0.026% of molten steel weight is with addition of Ti；It is fed with addition of after plus 400m silicon-calcium wires carries out Calcium treatment, 7.5min has been carried out after line feeding
Soft blow stirring, LF out-station temperatures be 1585 DEG C.
After molten steel arrives at a station, RH refines Argon argon flow amount and is controlled for 1300NL/min, the processing time of vacuum degree ＜ 3mbar
The outbound Alt of 10min, RH is 0.045%, and Argon >=6.5min after application of vacuum, out-station temperature is controlled at 1550 DEG C.
Allocation and transportation to six machines six stream casting machine φ 280mm sections carry out molten steel casting after RH refining treatments, will with the present invention
Ask relevant critical technical parameter it is actual control be：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 control of molten steel is at 25~32 DEG C；
Pulling rate is 1.0m/min；Crystallizer cooling control is in 2500L/min；Water Rate for Secondary Cooling Water is controlled in 0.33/kg steel.
After utilization is stablized in above-mentioned technological invention, slab quality is well controlled, and strand low power testing result is：Strand is dredged
0.5~1.0 grade of looseness, non-densified regions diameter proportion 40.2%；The defects of casting billet surface flawless, casting billet surface synthesis is without cleaning
Rate reaches 99.2%.The analysis consistency detection of strand in-situ metal, central area 0.82, strand equiax crystal section length ratio
50.1%~54.2%；It is 0.96~1.03 that strand, which bores sample segregation testing result,.
Embodiment two：
Certain steel mill refines → six machines six stream casting machine φ 280mm sections using 120t converter smeltings → LF stoves refining → RH and connects
Casting production 35CrMo series circular pipe blanks.At the end of bessemerizing, aim carbon is controlled for 0.05%, and outlet temperature control exists
1680℃；Chain-wales press 2.0m/tSteelIt feeds aluminum steel and carries out deoxidation；The outbound Composition Control of chain-wales is：[C] 0.30%, [Si]
0.18%th, [Mn] 1.30%, [P] 0.012%；Soft blow argon stirring is carried out after deoxidation alloying, mixing time 4.0min, stirring is not
It is exposed to there is molten steel.
Molten steel is reached at LF refining furnace, is carried out Argon molten steel and is fluctuated slightly, does not occur turning over phenomenon greatly, after refining, press
The 0.035% of molten steel weight is with addition of Ti；It is fed with addition of after plus 500m silicon-calcium wires carries out Calcium treatment, 7.5min has been carried out after line feeding
Soft blow stirring, LF out-station temperatures be 1600 DEG C.
After molten steel arrives at a station, RH refines Argon argon flow amount and is controlled for 1400NL/min, the processing time of vacuum degree ＜ 3mbar
The outbound Alt of 12min, RH is 0.050%, and Argon 7.5min after application of vacuum, out-station temperature is controlled at 1570 DEG C.
LF refining after treatment allocates and transports to six machines six stream casting machine φ 280mm sections and carries out molten steel casting, will with the present invention
Ask relevant critical technical parameter it is actual control be：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 control of molten steel is at 31~38 DEG C；
Pulling rate is 0.7m/min；Crystallizer cooling control is in 2400L/min；Water Rate for Secondary Cooling Water is controlled in 0.21/kgSteel。
After utilization is stablized in above-mentioned technological invention, slab quality is well controlled, and strand low power testing result is：Strand is dredged
0.5~1.0 grade of looseness, non-densified regions diameter proportion 41.1%；The defects of casting billet surface flawless, casting billet surface synthesis is without cleaning
Rate reaches 97.8%.The analysis consistency detection of strand in-situ metal, central area 0.83, strand equiax crystal section length ratio
50.3%~52.2%；It is 0.95~1.04 that strand, which bores sample segregation testing result,.
Claims (3)
1. the chrome molybdenum series circular pipe blank slab quality control method of φ 280mm, which is characterized in that comprise the following steps：
Ith, converter smelting：Converter terminal carbon is controlled according to mass percent 0.05% ~ 0.15%, outlet temperature >=1670 DEG C control
System, chain-wales are fed by the feed quantity of 1.4 ~ 2.0m of steel per ton plus aluminum steel, carry out deoxidation treatment, and chain-wales target component presses quality hundred
Divide ratio：[C] 0.20% ~ 0.35%, [Si] 0.16% ~ 0.30%, [Mn] 1.00% ~ 1.40%, [P]≤0.013% control, deoxygenated alloy
The soft blow argon processing of at least 3min is carried out after change；
IIth, LF stoves refined molten steel：The molten steel obtained in step I is subjected to LF stove refinings, whole Argon stirring is refined, refines latter stage
Add in titanium alloy material, addition by molten steel weight 0.018% ~ 0.038% carry out with addition of, afterwards carry out 200 ~ 500m feed quantity
It feeds and silicon-calcium wire is added to carry out Calcium treatment, add wherein the first heat of middle bag is fed by the upper limit, continue Argon stirring after refining at least
5min, out-station temperature is by 1560 ~ 1620 DEG C of controls；
IIIth, RH is refined：The molten steel obtained in step II is subjected to RH refinings, RH refinings require argon flow amount by 1150 ~ 1450NL/
Min is controlled, vacuum degree ＜ 3mbar, and processing time >=10min, the outbound Alt of RH are controlled according to mass percent 0.030% ~ 0.055%
System continues Argon at least 5min after application of vacuum, out-station temperature is by 1550 ~ 1580 DEG C of controls；
IVth, continuous casting steel：Continuous casting link using M-EMS in a manner that solidification end electromagnetic agitation is combined,
In, the parameter of M-EMS is：200 ~ 350A of stir current, 2 ~ 4Hz of frequency；Solidification end stirring parameter is：
100 ~ 150A of stir current, 4.0 ~ 7.0Hz of frequency.
2. the chrome molybdenum series circular pipe blank slab quality control method of φ 280mm as described in claim 1, it is characterized in that：Step
Ith, intensity Argon stirs during smelting process uses in II and III, is subject to molten steel surface and does not occur turning over boiling greatly；After smelting
It is stirred using soft blow argon, molten steel is made to have faint agitation.
3. the chrome molybdenum series circular pipe blank slab quality control method of φ 280mm as described in claim 1, it is characterized in that：In step
It carries out also needing to control following parameter when molten steel cast in rapid III：The degree of superheat is controlled at 25 ~ 38 DEG C, and casting speed control is 0.60
~ 1.20m/min, crystallizer cooling control are controlled in 2400 ~ 2500L/min, Water Rate for Secondary Cooling Water in 0.21 ~ 0.33/kg.
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| 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 |
| 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 |
| CN108687317B (en) * | 2018-06-29 | 2020-02-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for producing 42CrMoH steel by bloom continuous casting |
| 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 |
| 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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| CN104120352A (en) * | 2014-07-30 | 2014-10-29 | 攀钢集团西昌钢钒有限公司 | 34CrMo4 gas cylinder steel and production method thereof |
| CN105177427A (en) * | 2015-10-21 | 2015-12-23 | 攀钢集团西昌钢钒有限公司 | Steel for 30CrMo gas cylinders and production method thereof |
| CN105215310A (en) * | 2015-11-17 | 2016-01-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method that big cross section Properties of Heavy Rail Steel strand center porosity controls |
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