CN110106442A - A kind of ultra-fine acicular structure structural steel and its production method - Google Patents
A kind of ultra-fine acicular structure structural steel and its production method Download PDFInfo
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- CN110106442A CN110106442A CN201910451083.9A CN201910451083A CN110106442A CN 110106442 A CN110106442 A CN 110106442A CN 201910451083 A CN201910451083 A CN 201910451083A CN 110106442 A CN110106442 A CN 110106442A
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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
- C21C5/35—Blowing from above and through the bath
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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
- 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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
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- Physics & Mathematics (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of ultra-fine acicular structure structural steel, its chemical element component includes: C:0.081~0.11%, Si:0.10~0.14%, Mn:1.0~1.29%, P≤0.008%, S≤0.002%, Alt:0.041~0.055%, Ti:0.041~0.15%, B:0.0015~0.0030% by weight percentage, and surplus is Fe and inevitable impurity；Lower production costs of the present invention, production process is easy to control, and lumber recovery is high.
Description
Technical field
The invention belongs to low-alloy structural steel manufacturing fields, and in particular to a kind of ultra-fine acicular structure structural steel and its production
Method.
Background technique
Existing liquefied petroleum gas (LPG) storage tank is mostly used the low-temperature steels such as 07MnNiMoVDR, 09MnNiDR, 16MnDR and builds, just
Fire or normalizing+tempering state delivery, although such steel has good low-temperature impact toughness, its low temperature fracture toughness-crackle
Tip opening displacement (CTOD) is relatively low, on the other hand, is added to money in the low-temperature steels such as 07MnNiMoVDR, 09MnNiDR, 16MnDR
The alloying element Ni of source shortage or expensive alloying element V, Mo etc., production cost is higher.The purpose of the present patent application is
A kind of ultra-fine acicular structure structural steel that cheap low temperature fracture toughness is excellent is provided, for building liquefied petroleum gas storage tank, pole
Ground extremely cold area ship and Marine Engineering Steel structure, yield strength >=420MPa, 40 DEG C of CTOD >=3.5mm ensure low-temperature steel
Structural member safe operation, economic benefit are good.
Chinese invention patent application (application number CN200410061112, applying date 2004.11.16) discloses a kind of " needle
Shape tissue high-strength weathering steel and its production method " is related in steel grades design using extremely low carbon, Cu-Cr-Ni-Mo-Nb
Be added and Ti-Al-Zr-RE or Ca in two or more compound addition, by carbon content control be close to or smaller than room temperature
Maxima solubility 0.0218% of the lower carbon in α-Fe guarantees that master control tissue is uniform to reduce or inhibit the precipitation of cementite
Acicular structure, to obtain excellent weather resistance；Specific ingredient are as follows: C:0.01-0.04%, Si:0.15-0.30%, Mn:1.3-
1.6%, P≤0.03%, S≤0.01%, Cu:0.15-0.5%, Cr:0.2-0.4%, Ni:0.1-0.24%, Mo:0.1-0.3%, Nb:
0.03-0.06% and Ti≤0.03%, ALs≤0.035%, Zr≤0.01% and additional RE≤0.4kg/t steel or Ca≤0.005%
In two or more, surplus be Fe and can not surface be mingled with.Steel of the present invention is using thermomechanical controlled rolling technology+speed
Henan-precipitation control technology production, has excellent weatherability, excellent low-temperature flexibility and weldability are not required to preheat, postwelding before weldering
It is not required to be heat-treated, improves welding efficiency, can be widely used for the engineering structures such as bridge, building, traffic, ocean platform.The patent
The alloying element for being that involved steel grade need to control in place of technical deficiency is more, up to 12 kinds or more, and Ni containing expensive alloy element,
Mo, Zr etc., cost of material is expensive, contains Cu:0.15-0.5%, and hot cracking tendency increases in production process, and lumber recovery reduces, and rolls
Journey is needed using thermomechanical controlled rolling technology+relaxation-precipitation control technology, and process is complicated, it is difficult to control.
Chinese invention patent (application number CN200910180490, applying date 2009.10.16) discloses that " Micro Alloying is needle-shaped
Organize high strength low yield ratio weathering resistant steel and its production method ", the ingredient and its weight percent which includes are as follows: substantially at
Point: C 0.03~0.08%, Si 0.30~0.60%, Mn 1.30~1.80%, P≤0.015%, S≤0.010%, Cu
0.30~0.60%, Ni 0.20~0.50%, Cr 0.40~0.80%, Mo 0.10~0.40%, Nb 0.030~
0.080% and Ti≤0.04%；Optional component: two kinds in AlS≤0.04% and RE≤0.40kg/t steel or Ca≤0.005%
Or it is two or more；And the Fe and impurity of surplus, welding cold crack sensitivity index is low, and corrosion resistance index is high, has excellent
Mouldability, weatherability, weldability and low-temperature flexibility, while its preparation process is simple, with short production cycle without heat treatment, raw
It produces at low cost.The patented technology be disadvantageous in that be added in steel 0.3~0.6% Cu, Cu is formed in batch production process
Pyrogenicity crackle reduces lumber recovery, in addition also added expensive alloy element Ni, Mo, increases production cost.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of ultra-fine needle for the above disadvantage of the existing technology
Shape institutional framework steel and its production method, lower production costs, production process is easy to control, and lumber recovery is high.
The technical solution that the present invention solves the above technical problem is: a kind of ultra-fine acicular structure structural steel, chemical element
Ingredient includes: C:0.081~0.11%, Si:0.10~0.14%, Mn:1.0~1.29%, P≤0.008%, S by weight percentage
≤ 0.002%, Alt:0.041~0.055%, Ti:0.041~0.15%, B:0.0015~0.0030%, surplus are Fe and can not keep away
The impurity exempted from.
The alloying element principle controlled in the present invention is described as follows:
C(carbon): the alloying element C of certain content is added in structural steel, a part, which is solid-solution in Fe matrix, forms gap solid solution by force
Change, improves the intensity of steel, make yield strength >=420MPa of the present patent application structural steel, if the C content of addition is lower than 0.081%,
Super saturated solid solution is insufficient in the C content of matrix, and strengthening effect is inadequate, and yield strength is difficult to reach expected；If C content is higher than
0.11%, then Fe is easily formed in process of production3C etc., reduces the low temperature fracture toughness of steel, and the low temperature steel construction of construction easily makes
With brittle fracture occurs in the process, therefore the content of C is set as 0.081 ~ 0.11%；
Mn(manganese): appropriate alloying element Mn is added in steel can stablize high temperature austenitic body tissue, reduce austenite transformation temperature, use
The manufacturing method of present patent application can inhibit austenite and be changed into polygonal ferrite, obtains acicular structure.The Mn added in steel
If content is lower than 1.0%, austenite phase transformation critical-temperature reduction amount is not enough to inhibit the formation of granular ferrite in production process,
Be also easy to produce granular ferrite+pearlitic structrure, it is difficult to obtain ultra-fine acicular structure, on the one hand because soft phase constitution ferrite content compared with
Cause yield strength on the other hand to deteriorate the low temperature fracture toughness of steel lower than 420MPa more；If Mn content is higher than 1.29%, production
Lath martensite tissue easily generated in the process, intensity is excessively high, and toughness especially freezing crack drastically reduces, therefore by Mn content model
It encloses and is set in 1.0 ~ 1.29%；
P(phosphorus): in steel P belong to harmful element, easily grain boundaries formed segregation, lead to crystal boundary brittle fracture, by P be limited to P≤
0.008%, if controlling P content too low, smelting cost is significantly increased；
S(sulphur): residual elements S is harmful element in structural steel, reacts to form sheet field trash MnS with Mn in steel, isolates matrix,
Micro-crack is generated, the low temperature fracture toughness of steel is drastically reduced, for requiring the structural steel of low-temperature flexibility, the lower S content the better, but
If controlling S too low, multiple desulfurization process is needed in smelting process, production cost is caused to be significantly increased, therefore by S content control
System is advisable in S≤0.002%；
Si (silicon): a certain amount of silicon addition is added in structural steel can form displacement solution strengthening, improve the yield strength of steel,
But Si belongs to ferrite former, improves the phase transformation critical-temperature of steel, the formation that excessively high Si easily promotes granular ferrite is added,
It is difficult to form ultra-fine acicular structure, therefore the Si content in steel is set in 0.10 ~ 0.14% range；
Alt(aluminium): on the one hand the effect that aluminium Alt (full aluminium) is added in steel can dispel oxygen element in steel, improve the degree of purity of steel,
On the other hand, Al reacted with residual elements N in steel production AlN, can effective thinning microstructure, if but Al content it is excessively high, easily formed
Water chestnut shape field trash Al2O3, the fracture toughness of steel is reduced, therefore the full Alt content in steel is set in 0.041 ~ 0.055% range；
Ti(titanium): Ti is added in steel can react Ti (CN) fine particle generated with C, N in steel, effectively prevent crystal boundary mobile, suppression
Combinations grain length is big, promotes the formation of ultra-fine acicular structure, and on the other hand, the Ti for being solid-solution in matrix can inhibit atom diffusion, stablizes
Austenite, inhibit transformation of the austenite to granular ferrite, promote acicular structure to change, if but Ti content be higher than 0.15%,
Ti (CN) precipitated phase of formation is easy to grow up, be roughened, and reduces the low temperature fracture toughness of steel, therefore the Ti content in steel is set in
0.041 ~ 0.15% range；
B (boron): being added a small amount of alloying element B in steel, can significantly reduce phase transformation critical-temperature, inhibits high temperature transformation product-more
The ferritic formation of side shape, promotes the formation of acicular structure.Part B segregation purifies crystal boundary in crystal boundary position, prevents harmful element
As, P etc. reduce crystal boundary brittleness, improve the low temperature fracture toughness of steel in crystal boundary segregation, if but B content is more than 0.0030% in steel,
Brittlement phase BN is then easily formed, the low temperature fracture toughness of steel is deteriorated, therefore by B content control in steel in 0.0015 ~ 0.0030% range.
The present invention further limits scheme:
The weight percent of Ti above-mentioned is 0.061~0.1%.
The weight percent of B above-mentioned is 0.0018~0.0028%.
The production method of ultra-fine acicular structure structural steel above-mentioned, specifically includes the following steps:
(1) converter smelting
A. top and bottom combined blown converter is packed into blast-melted deep desulfurization, steel scrap, MnFe, SiFe these alloy material meltings, on converter top
Fire door insertion oxygen rifle is blown into oxygen and furnace temperature is promoted to 1630~1720 DEG C, carries out decarburization operation, converter bottom is blown into argon gas and stirs
Molten steel is mixed and homogenized, CaO, FeO is added to take off P, sample detection molten steel C content is tapped when C content is in 0.03-0.06%, if C
Content in the range, is not tapped after continuing oxygen decarburization to the composition range, and the control of tapping time was at 4-9 minutes；
(2) RH is refined, and before steel treatment, is first immersed dip pipe in ladle molten steel to be processed, and vacuum system and cooling are started
Water system, when pressure is lower than 0.7mbar in vacuum tank, retention time >=12 minute, whole molten steel cycle-index >=5 time；Successively
Al ingot, TiFe, BFe is added, carries out alloying molten steel, whether the content of sampling analysis C, Si, Mn, Alt, Ti and B are above-mentioned super
In the range of each ingredient of fine acicular institutional framework steel, in range, the processing time casts after, not in range, addition
Carbon dust, TiFe, BFe, SiFe, MnFe and Al adjust to range, are then casting continuously to form slab；
(3) it rolls
Slab first heats, and heating temperature is 1180~1240 DEG C, then carries out soaking, and soaking temperature is 1200-1220 DEG C, soaking
Time is 30-50 minutes, slab time inside furnace >=4 hour；
Two stages complete rolling:
First stage rolling: recrystallization stage rolling: use high pressure water dephosphorization before rolling, high pressure water dephosphorization 2-3 times, start rolling temperature:
950~1100 DEG C, the completion first stage rolling of 4-6 passage, percentage pass reduction >=18%,
Second stage rolling: it non-recrystallization stage rolling: is used after the completion of recrystallization stage rolling in section cooling watering rapid cooling
Between base, intermediate base temperature is lower than the rolling of 880 DEG C of beginnings second stage, rolling temperature: 790~880 DEG C, 4-6 passage completion second
Stage rolling, percentage pass reduction >=22% are 1-3 times reciprocal using straightener after finish to gauge at the operation of rolling high pressure water dephosphorization 1-2 times
Flatten steel plate, second stage open rolling workpiece thickness must meet following relationship: second stage rolls workpiece thickness=(slab
Thickness/2)+18mm；
Roller repairing
It waters and is quickly cooled down after rolling, red temperature: 550 ~ 650 DEG C.
CaO+FeO additional amount above-mentioned is the 3 ~ 8% of molten steel capacity.
Entire converter smelting time control above-mentioned was at 30-50 minutes.
The beneficial effects of the present invention are: the alloying element that steel grade involved by existing patented technology need to control is more, and containing high
Noble alloy element Ni, Mo, Zr etc., cost of material is expensive, contains Cu:0.15-0.5%, and hot cracking tendency increases in production process, becomes a useful person
Rate reduces, and the operation of rolling is needed using thermomechanical controlled rolling technology+relaxation-precipitation control technology, and process is complicated, it is difficult to
Control, steel grade chemical Composition Control element of the present invention is less, is simply easy to control operation, and production cost is low, and lumber recovery is high, economical
Profitable, on the one hand simple production process of the present invention dispels the gases such as N, H, O in steel by RH vacuum refining after converter smelting；
On the other hand, it is recycled by molten steel, promotes in steel harmful bulky grain to be mingled with and sufficiently float to steel slag, purification molten steel, the present invention adopts
With recrystallization and the non-cooling finished steel plate for obtaining ultra-fine acicular structure of recrystallization two-stage control rolling+control, water after rolling
Fast quickly cooling, red temperature is in 550 ~ 650 DEG C of models after controlling second stage workpiece thickness=(slab thickness/2)+18mm and finish to gauge
It encloses to eliminate the residual stress of Plate Production process generation, can get excellent synthesis mechanical property, yield strength >=420MPa is broken
- 40 DEG C of CTOD >=3.5mm of toughness are split, and production process process is easy to operate, and lumber recovery is high, remarkable in economical benefits, due to strong
Degree is high, and low temperature fracture toughness is good, can be used for building low temperature environment steel construction piece, can ensure that safe operation.
Specific embodiment
According to the requirement of chemical element component of the present invention, mass percent and production method, five embodiments are prepared for, respectively
For embodiment 1, embodiment 2, embodiment 3, embodiment 4, embodiment 5, for verify each chemical constituent and mass percentage content with
And recrystallization stage rolling temperature range, the non-cooling temperature of control recrystallized after rolling temperature range, finish to gauge in the operation of rolling
Influence of the range to performance parameter is spent, three comparative examples are prepared for, is i.e. comparative example 1, comparative example 2 and comparison is real
Example 3 is applied, that is, smelt and has rolled 8 batches of steel plates.Wherein, the chemical constituent mass percentage content of comparative example 1 is not in this hair
In bright range, and the technological parameter of preparation process is within the scope of the invention, the chemical constituent quality percentage of comparative example 2
Within the scope of the invention than content, and the technological parameter of preparation process not within the scope of the invention, the change of comparative example 3
Constituent mass degree and the technological parameter of preparation process are not within the scope of the invention.Five embodiments and three
The chemical element component weight percent of comparative example is shown in Table 1, and wherein surplus is Fe and inevitable impurity, production process
Control parameter and plate quality situation are shown in Table 2.
The chemical component of 1 embodiment of the present invention of table and comparative example compares (wt%)
2 embodiment of the present invention of table and the control of comparative example production process are to plate property situation table
It can be seen that by Tables 1 and 2, chemical component and mass percent and the production process control of 1-5 of the embodiment of the present invention
Rolling temperature steel plate yield strength produced be above 420MPa, -40 DEG C of CTOD of fracture toughness are above 3.5mm.And it is right
Than composition of steel range or/and the production technology not institute within the scope of the present invention of embodiment 1, comparative example 2 and comparative example 3
The comparison steel plate yield strength of production is lower than 366MPa, and -40 DEG C of CTOD are below 2.1mm.Wherein, the embodiment of the present invention 4 is made
The yield strength of standby steel plate is 458MPa, and -40 DEG C of CTOD reach 5.2mm, and comprehensive mechanical property is excellent, manufactures ultralow temperature knot
Component can effectively avoid embrittlement, safe operation, be most preferred embodiment.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (6)
1. a kind of ultra-fine acicular structure structural steel, it is characterised in that: its chemical element component includes: C by weight percentage:
0.081~0.11%, Si:0.10~0.14%, Mn:1.0~1.29%, P≤0.008%, S≤0.002%, Alt:0.041~
0.055%, Ti:0.041~0.15%, B:0.0015~0.0030%, surplus are Fe and inevitable impurity.
2. ultra-fine acicular structure structural steel according to claim 1, it is characterised in that: the weight percent of the Ti is
0.061~0.1%.
3. ultra-fine acicular structure structural steel according to claim 1, it is characterised in that: the weight percent of the B is
0.0018~0.0028%.
4. the production method of ultra-fine acicular structure structural steel according to claim 1 to 3, it is characterised in that: tool
Body the following steps are included:
(1) converter smelting
A. top and bottom combined blown converter is packed into blast-melted deep desulfurization, steel scrap, MnFe, SiFe these alloy material meltings, on converter top
Fire door insertion oxygen rifle is blown into oxygen and furnace temperature is promoted to 1630~1720 DEG C, carries out decarburization operation, converter bottom is blown into argon gas simultaneously
Stirring evenly molten steel, adds CaO, FeO to take off P, and sample detection molten steel C content is tapped when C content is in 0.03-0.06%, if C
Content in the range, is not tapped after continuing oxygen decarburization to the composition range, and the control of tapping time was at 4-9 minutes；
(2) RH is refined, and before steel treatment, is first immersed dip pipe in ladle molten steel to be processed, and vacuum system and cooling are started
Water system, when pressure is lower than 0.7mbar in vacuum tank, retention time >=12 minute, whole molten steel cycle-index >=5 time, successively
Al ingot, TiFe, BFe is added, carries out alloying molten steel, whether the content of sampling analysis C, Si, Mn, Alt, Ti and B are above-mentioned super
In the range of each ingredient of fine acicular institutional framework steel, in range, the processing time casts after, not in range, addition
Carbon dust, TiFe, BFe, SiFe, MnFe and Al adjust to range, are then casting continuously to form slab；
(3) it rolls
Slab first heats, and heating temperature is 1180~1240 DEG C, then carries out soaking, and soaking temperature is 1200-1220 DEG C, soaking
Time is 30-50 minutes, slab time inside furnace >=4 hour；
Two stages complete rolling:
First stage rolling: recrystallization stage rolling: use high pressure water dephosphorization before rolling, high pressure water dephosphorization 2-3 times, start rolling temperature:
950~1100 DEG C, the completion first stage rolling of 4-6 passage, percentage pass reduction >=18%,
Second stage rolling: it non-recrystallization stage rolling: is used after the completion of recrystallization stage rolling in section cooling watering rapid cooling
Between base, intermediate base temperature is lower than the rolling of 880 DEG C of beginnings second stage, rolling temperature: 790~880 DEG C, 4-6 passage completion second
Stage rolling, percentage pass reduction >=22% are 1-3 times reciprocal using straightener after finish to gauge at the operation of rolling high pressure water dephosphorization 1-2 times
Flatten steel plate, second stage open rolling workpiece thickness must meet following relationship: second stage rolls workpiece thickness=(slab
Thickness/2)+18mm；
Roller repairing
It waters and is quickly cooled down after rolling, red temperature: 550 ~ 650 DEG C.
5. the production method of ultra-fine acicular structure structural steel according to claim 4, it is characterised in that: the CaO+FeO
Additional amount is the 3 ~ 8% of molten steel capacity.
6. the production method of ultra-fine acicular structure structural steel according to claim 4, it is characterised in that: the entire converter
The duration of heat controlled at 30-50 minutes.
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| CN201910451083.9A CN110106442A (en) | 2019-05-28 | 2019-05-28 | A kind of ultra-fine acicular structure structural steel and its production method |
| PCT/CN2019/111416 WO2020237976A1 (en) | 2019-05-28 | 2019-10-16 | Superfine acicularly-structured structural steel and production method therefor |
| MYPI2021007063A MY197582A (en) | 2019-05-28 | 2019-10-16 | Superfine acicularly-structured structural steel and production method therefor |
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| WO2020237976A1 (en) * | 2019-05-28 | 2020-12-03 | 南京钢铁股份有限公司 | Superfine acicularly-structured structural steel and production method therefor |
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| CN113373386B (en) * | 2021-05-22 | 2024-05-14 | 江苏铸鸿重工股份有限公司 | Method for preparing Cr-Ni-Mo alloy steel ingot by utilizing scrap steel |
| CN115418459B (en) * | 2022-08-26 | 2024-03-22 | 河钢股份有限公司 | Production method of steel plate |
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| CN1323187C (en) * | 2004-11-16 | 2007-06-27 | 武汉钢铁(集团)公司 | Acicular constituent high strength weathering resistant steel and producing method thereof |
| KR100868423B1 (en) * | 2006-12-26 | 2008-11-11 | 주식회사 포스코 | High strength api-x80 grade steels for spiral pipes with less strength changes and method for manufacturing the same |
| CN101660108A (en) * | 2009-10-16 | 2010-03-03 | 江苏省沙钢钢铁研究院有限公司 | Non-quenched acicular structure high strength low yield ratio weathering resistant steel and production method thereof |
| JP5612532B2 (en) * | 2011-04-26 | 2014-10-22 | 株式会社神戸製鋼所 | Steel sheet excellent in low temperature toughness and weld joint fracture toughness and method for producing the same |
| CN103343281B (en) * | 2012-10-31 | 2016-10-05 | 钢铁研究总院 | A kind of lamellar two-phase high-strength and high-toughness steel and preparation method thereof |
| CN110106442A (en) * | 2019-05-28 | 2019-08-09 | 南京钢铁股份有限公司 | A kind of ultra-fine acicular structure structural steel and its production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020237976A1 (en) * | 2019-05-28 | 2020-12-03 | 南京钢铁股份有限公司 | Superfine acicularly-structured structural steel and production method therefor |
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| WO2020237976A1 (en) | 2020-12-03 |
| MY197582A (en) | 2023-06-26 |
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