CN108754303A - A kind of high strength bolting steel of atmospheric corrosion resistance and excellent in resistance to delayed fracture - Google Patents
A kind of high strength bolting steel of atmospheric corrosion resistance and excellent in resistance to delayed fracture Download PDFInfo
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- CN108754303A CN108754303A CN201810357699.5A CN201810357699A CN108754303A CN 108754303 A CN108754303 A CN 108754303A CN 201810357699 A CN201810357699 A CN 201810357699A CN 108754303 A CN108754303 A CN 108754303A
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- 230000007797 corrosion Effects 0.000 title claims abstract description 28
- 239000000203 mixture Substances 0.000 claims abstract description 10
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- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 3
- 229910052802 copper Inorganic materials 0.000 claims abstract description 3
- 229910052702 rhenium Inorganic materials 0.000 claims abstract description 3
- 229910052758 niobium Inorganic materials 0.000 claims description 7
- 229910052726 zirconium Inorganic materials 0.000 claims description 6
- 238000010276 construction Methods 0.000 abstract description 11
- 239000013078 crystal Substances 0.000 description 13
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- 238000000576 coating method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
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- 229910000851 Alloy steel Inorganic materials 0.000 description 2
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- 150000001875 compounds Chemical class 0.000 description 2
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- 101100434462 Arabidopsis thaliana ADS3 gene Proteins 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
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- 229910000746 Structural steel Inorganic materials 0.000 description 1
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Classifications
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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
- 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
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of atmospheric corrosion resistance and the high strength bolting steels of excellent in resistance to delayed fracture, which is characterized in that by mass percentage, composition includes：C：0.30~0.45%, Si：D 0.25%, Mn：0.40~1.40%, P：D 0.012%, S：D 0.008%, Cr：0.40~1.20%, Mo：0.15~0.50%, Ni：0.30~1.20%, Cu：0.20~0.60%, V：0.05~0.20%, Re：0.005~0.030%, remaining is Fe and inevitable impurity element.The high strength bolting steel of atmospheric corrosion resistance and excellent in resistance to delayed fracture provided by the invention is compared with prior art, not only strength level is high, and there is excellent atmospheric corrosion resistance and resistance for delayed fracture, it can be used to make the steel constructions such as bridge with 12.9 grade high-strength bolts；And it is at low cost.
Description
Technical field
The present invention relates to field of alloy steel.More particularly, to a kind of atmospheric corrosion resistance and excellent in resistance to delayed fracture
High strength bolting steel.
Background technology
Steel construction because it is high with intensity, from heavy and light, short construction period, foundation cost be low and the shock resistance series such as preferably have
A little it is widely used in infrastructure.However, steel construction in various atmospheric environments using will produce corrosion, to this domestic steel
The mode that structure is all made of application substantially carries out anti-corrosion.But the anti-corrosion time limit of the methods of surface spraying is generally 5~10 years, because applying
The aging and differentiation of layer, it is necessary to carry out periodic maintenance and again anticorrosive coating, coating process can cause environmental pollution, and be added to
This.Therefore, external especially U.S. etc. is the application for having started to exempt from application weather-resistant steel plate early in the sixties in last century.China is close
Impressive progress is achieved in the application aspect of weathering steel over year, more and more bridge constructions start to select Weather-resistance bridge steel.
The main connection type of one of plank and shaped steel that bridge structure uses is high strength exploitation, plays connection function
High-strength bolt the problem of being equally faced in terms of atmospheric corrosion, to this all using coating solution.However, with exempting to apply
The construction of the weather-proof Steel Bridge of dress, the demand to weather-resistant and high-strength degree bolt increase severely.Currently, the steel constructions high-strength bolt such as bridge
Strength level be up to 10.9 grades, with the development of the steel constructions such as Longspan Bridge and answering for higher intensity rank weathering steel
With proposing the requirement of higher intensity level to the material that uses of connection, structure lightened wanted with high security etc. with meeting
It asks.However, it is a large amount of use the result shows that, when the tensile strength of bolt manufacture with the low-alloy steel of modifier treatment is more than about 1000
When~1200MPa, delayed fracture problem just becomes very prominent.Therefore, for the steel constructions high strength bolting steel such as bridge, no
It is required nothing more than with excellent atmospheric corrosion resistance, but also requires it with excellent resistance for delayed fracture.
In recent years, the research and development of weatherability and delayed fracture resistance high strength bolting steel have been carried out in the world.Specially such as Japan
Sharp JP2014-1442 proposes a kind of high strength bolting steel for having both weatherability and delayed fracture resistance, but its strength level is
It 1000~1200MPa grades, only can be used to make 10.9 grade high-strength bolts.China applies for a patent 2017101375650.8,
201710375670.5 propose and exempt from the application steel construction high strength bolting steel of resistance to industrial atmospheric and manufacturing method, exempt from respectively
The application bridge structure high strength bolting steel of resistance to industrial atmospheric and manufacturing method, the tensile strength after modifier treatment are horizontal
It is 1000~1200MPa grades, equally only may be utilized in fabricating 10.9 grade high-strength bolts, it is difficult to meets large span and exempt from application bridge pair
The requirement of 12.9 grade high-strength bolts；In addition, the impurity element P content in steel is higher, although with the good of weatherability is improved
Effect, but the resistance for delayed fracture of severe exacerbation steel.In addition, the 1300MPa grade delayed fracture resistances of SUMITOMO CHEMICAL metal exploitation
High strength bolting steel ADS3 (iron と Steel, 1996,82:297) and a kind of tension of Chinese patent CN00105872.X inventions is strong
The delayed fracture resistance bolting steel of 1300~1500MPa is spent, although may be utilized in fabricating the high-strength of 12.9 grades and its above intensity rank
Bolt is spent, but it does not account for weatherability, is equally difficult to meet the steel constructions such as bridge to high-strength bolt atmospheric corrosion resistance
The requirement of energy.
Invention content
Based on background above technology, the present invention provides a kind of tensile strength 1200MPa or more and has excellent resistance to air
The high strength bolting steel of corrosion and resistance for delayed fracture, can be used to 12.9 grades of steel knots for making tensile strength 1200MPa or more
Structure high-strength bolt.
In order to achieve the goal above, the present invention uses following technical scheme：
A kind of high strength bolting steel of atmospheric corrosion resistance and excellent in resistance to delayed fracture, by mass percentage, composition
Including：
C：0.30~0.45%, Si：≤ 0.25%, Mn：0.40~1.40%, P：≤ 0.012%, S：≤ 0.008%,
Cr：0.40~1.20%, Mo：0.15~0.50%, Ni：0.30~1.20%, Cu：0.20~0.60%, V：0.05~
0.20%, Re：0.005~0.030%, remaining is Fe and inevitable impurity element.
Preferably, the bolting steel composition also includes：Any in Nb and Zr that mass percent is 0.01~0.08%
Kind or the sum of two kinds.
Preferably, the mass percent of V, Mo, Nb or Zr element meets relational expression in the composition of the bolting steel：0.20≤
V (%)+0.5Mo (%)+0.5Nb (Zr) (%)≤0.30.Wherein V (%), Mo (%) indicate the quality percentage of V and Mo respectively
Than；Nb (Zr) (%) indicates the mass percent of any one of Nb and Zr elements or the sum of two kinds.
Preferably, atmospheric corrosion resistance sex index I >=6.5 of the bolting steel.
The effect of each element and proportioning are according to as follows in technical solution of the present invention：
C：In order to obtain required strength level after quenching+high tempering, C content must be 0.30% or more；But increase C
Content will have larger damage to the plasticity and toughness of steel, weatherability, resistance for delayed fracture and cold-forming property, therefore C content is answered
Control is below 0.45%.
Si：Common deoxidier in steel；In addition Si elements significantly deteriorate the cold-forming property of steel, while also promoting impurity member
The crystal boundary segregation of plain P and S has deterioration effect to the resistance for delayed fracture of steel, thus controls its content and be no more than 0.25%.
Mn：It is the effective element of deoxidation and desulfurization, the quenching degree and intensity of steel, but hardened steel high tempering can also be improved
When, Mn and P have strong grain boundary cosegregation tendency, promote temper brittleness, and excessively high Mn contents can deteriorate the weatherability of steel, because
And Mn contents are controlled 0.40~1.40%.
P：P although more can significantly improve the weatherability of low-alloy structural steel, due to P can in solidification of molten steel shape
At microsegregation, then in high-temperature heating, segregation makes the brittleness of steel significantly increase in crystal boundary, to more significantly increase steel
Delayed fracture sensibility.In addition, the resistance of deformation of steel can be reduced by reducing P content, thus the content of control P 0.012% with
Under.
S：Inevitable impurity forms MnS and is mingled with and can deteriorate the cold-forming property of steel, resistance to delay in crystal boundary segregation
Fracture property and weatherability reduce S contents in steel and the deformability of steel can be improved and reduce the non-metallic inclusion quantity in steel,
Can also reduce S mitigates embrittlement of grain boundaries in the segregation of crystal boundary simultaneously, improves cold-forming property, toughness, the delayed fracture resistance of steel
Energy and weatherability, thus its content is controlled below 0.008%.
Cr：The quenching degree and resistance to tempering that steel can be effectively improved, to obtain required high intensity；It is compound with Cu simultaneously
It is added, can significantly improve the weatherability of steel.Content is difficult to function as described above less than 0.40%, but content is more than 1.20%
The toughness and cold-workability of steel can then be deteriorated.
Mo：Mo is while the quenching degree and resistance to tempering for effectively improving steel, additionally it is possible to strengthen crystal boundary, improve the resistance to of steel
Delayed fracture property.Content is difficult to function as described above less than 0.15%, but content is more than that 0.50% above-mentioned function and effect is full
With, and increase cost.
Ni：Ni can improve the quenching degree of steel and improve low-temperature flexibility.Add Ni that the corrosion potential of steel can be made to pros
To variation, thus improve the stability of steel；In addition, Ni can also improve the corrosion resistance of steel, inhibit the absorption of hydrogen, and then to changing
Kind resistance for delayed fracture is beneficial.Content is difficult to function as described above less than 0.30%, but content is more than 1.20% above-mentioned work
It is saturated with effect, and increases cost, thus control Ni contents 0.30~1.20%.
Cu：Cu elements can significantly improve the weatherability of steel, and effect is obvious in 0.20% or more content, but contains
Amount acts on saturation more than 0.60%, and can reduce the high-temp plastic of steel, and crackle is also easy to produce in hot procedure, thus controls
Cu contents are 0.20~0.60%.
V：V can crystal grain thinning, the vanadium carbide nitride being precipitated when higher temperature is tempered is except can to generate post-curing further
Outside the intensity for improving steel, due also to vanadium carbide nitride has stronger trap energy, capable of trapping hydrogen, so that it is evenly dispersed in transgranular,
Diffusion and the crystal boundary segregation for inhibiting hydrogen, so as to improve the resistance for delayed fracture of steel.V content is difficult to play above-mentioned less than 0.05%
Effect, but content is more than 0.20% and acts on saturation and increase cost.
Re：Re has the function of deoxidization desulfuration and to non-metallic inclusion denaturation treatment, improve steel cold-forming property and
Reduce corrosion source point.Additionally it is possible to effectively trap hydrogen, the segregation of hydrogen and other harmful elements on crystal boundary is reduced, is reduced
The diffusion of hydrogen can further decrease the sensibility of the delayed fracture of steel.Re contents do not have above-mentioned work less than 0.005%
With, but content is more than 0.030%, then since field trash increases, deteriorates the weatherability and resistance for delayed fracture of steel instead, thus
Its content is controlled 0.005~0.030%.
Nb：Can detailed ground crystal grain thinning, improve the toughness of steel, while its carbide is very strong hydrogen trap, can be into one
Step improves the resistance for delayed fracture of steel.Content does not have above-mentioned effect less than 0.01%, but content is more than 0.08% and acts on
Saturation.
Zr：It is similar that it acts on Nb.
In addition, in order to further obtain excellent resistance for delayed fracture, found by numerous studies analysis, V, Mo, Nb
Equal elements also need to carry out suitable compound addition, i.e. its content also needs to meet parameter θ relational expression：0.20≤V (%)+0.5Mo
(%)+0.5Nb (Zr) (%)≤0.30；θ=V (%)+0.5Mo (%)+0.5Nb (Zr) (%), when θ values are less than 0.20, to the greatest extent
Managing the content of single V, Mo, Nb or Zr element it is disconnected may can not still to obtain excellent resistance to delay in above-mentioned most suitable range
Fragility energy；When θ values are more than 0.30, then saturation is acted on, and improve the cost of steel.It is resistance to big in order to ensure atmospheric corrosion resistance
Gas corrosion sex index I >=6.5.
In specific production application, electric arc furnaces has just can be used in bolt of the invention or converter+external refining is smelted, and is cast into
Steel ingot is casting continuously to form base, is then rolled into the products such as Bar Wire Product.
In technical scheme of the present invention：(1) the anti-temper softening ability of addition strong elements Mo, V etc. is tiny using disperse
The post-curing of MC Carbide Precipitation phases acts on, and required strength level is obtained after quenching+high tempering, and (tensile strength is more than
1200MPa), while higher temperature may make crystal boundary film globular cementite to disconnect simultaneously nodularization, in conjunction with transgranular disperse educt
Tiny carbide reduces the segregation of hydrogen near crystal boundary, improves grain-boundary strength, is conducive to obtain good delayed fracture resistance
Energy；(2) content of impurity element P, S are reduced as far as possible, while reducing Mn constituent contents, to reduce steel inclusion quantity and suppression
The crystal boundary segregation of impurity element, improves the toughness and resistance for delayed fracture of steel when system tempering；(3) be added weatherability element Cu and
Ni, to obtain good weatherability properties, wherein Ni elements can also improve the low-temperature flexibility of steel and improve the quenching degree of steel；(4) it is added suitable
The rare earth element of amount to field trash be denaturalized and plays trap to hydrogen, further decreases segregation and improvement of the hydrogen in crystal boundary
Weatherability.
Beneficial effects of the present invention are as follows：
The high strength bolting steel of atmospheric corrosion resistance and excellent in resistance to delayed fracture provided by the invention and prior art phase
Than not only strength level is high, but also has excellent atmospheric corrosion resistance and resistance for delayed fracture, can be used to make the steel such as bridge
12.9 grade high-strength bolts of structure；And it is at low cost.
Specific implementation mode
In order to illustrate more clearly of the present invention, with reference to preferred embodiment, the present invention is described further.Ability
Field technique personnel should be appreciated that following specifically described content is illustrative and be not restrictive, this should not be limited with this
The protection domain of invention.
Sample preparation：
Chemical composition ranges designed according to this invention, smelted on 500kg vaccum sensitive stoves 7 stoves steel of the present invention and
7 stove compared steels, specific chemical composition is as shown in table 1, and wherein heat (batch) number 1~7 is steel of the present invention, and heat (batch) number 8~14 is compared steel.Examination
Testing the specific preparation process of required sample is：Using vacuum induction furnace smelting 500kg steel ingots, it is then forged into bar, forging state experiment
Material carries out heat treatment post-processing into the sample needed for experiment through air furnace.In specific production technology, work is prepared using corresponding
Skill can be obtained corresponding steel.
Performance test：
Molten steel is cast ingot, and forged bar is made.Normal room temperature tensile sample (l is processed into sampling from bar0=
5d0, d0=5mm), notch tensile delayed fracture sample (diameter d=5mm, indentation, there dN=3mm, 60 ° of ± 2 °/0.15R of notch ±
And alternate-immersion experimental sample (60mm × 40mm × 3mm) 0.025).
Sample stretched at room temperature, notch tensile delayed fracture and experiment.Delayed fracture experimental solutions are pH=3.5
± 0.5 Walpole inhibiting solutions (16.4 grams of anhydrous sodium acetate+1000 milliliters of deionized waters of+15.4 milliliters of primes concentrated hydrochloric acids or
Distilled water).Such as σfFor the minimum stress being broken, σnFor the maximum not being broken within 100 hours defined deadlines
Stress then defines notch tensile limit stress σcFor：σc=1/2 (σf+σn), it is less than 10% for being differed with actual value for making to measure,
It is required that σf-σn≤0.2σc.0.01mol/L NaHSO are used in period soaking corrosion experimentation3Industrial atmospheric environment is simulated in all immersion liquid,
Cycle period is 60min, wherein infiltrating 15min under the conditions of 45 DEG C, then dries 45min, drying process specimen surface highest
Temperature 70 C, accelerated corrosion 72h.In order to avoid the accidental error of experiment, every group of experiment at least prepares 3 parallel samples.Gained
As a result it has been included in table 2.
From table 2 it can be seen that steel of the present invention it is quenched+high tempering processing after, can get 1200MPa grade or more resist
Tensile strength, and there is good plasticity, that is, meet the intensity and plasticity requirements of 12.9 grade bolts.Steel of the present invention 1200~
Weatherability and resistance for delayed fracture under the strength level of 1400MPa compared with compared steel under same intensity level significantly carry
It is high, you can while excellent weatherability and resistance for delayed fracture are obtained, it can be used to make atmospheric corrosion resistance and delayed fracture resistance
12.9 grade high-strength bolts.
The chemical composition (mass percent) of steel in 1 embodiment of the present invention of table and comparative example
The comparison of the intensity, plasticity, weatherability and resistance for delayed fracture of 2 embodiment of the present invention of table and compared steel
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention may be used also on the basis of the above description for those of ordinary skill in the art
To make other variations or changes in different ways, all embodiments can not be exhaustive here, it is every to belong to this hair
Row of the obvious changes or variations that bright technical solution is extended out still in protection scope of the present invention.
Claims (4)
1. the high strength bolting steel of a kind of atmospheric corrosion resistance and excellent in resistance to delayed fracture, which is characterized in that press quality percentage
Than composition includes：
C：0.30~0.45%, Si：≤ 0.25%, Mn：0.40~1.40%, P：≤ 0.012%, S：≤ 0.008%, Cr：
0.40~1.20%, Mo：0.15~0.50%, Ni：0.30~1.20%, Cu：0.20~0.60%, V：0.05~0.20%,
Re：0.005~0.030%, remaining is Fe and inevitable impurity element.
2. the high strength bolting steel of atmospheric corrosion resistance and excellent in resistance to delayed fracture, feature exist according to claim 1
In the bolting steel composition also includes：Any one of Nb and Zr that mass percent is 0.01~0.08% or the sum of two kinds.
3. the high strength bolting steel of atmospheric corrosion resistance and excellent in resistance to delayed fracture, feature exist according to claim 2
In the mass percent of V, Mo, Nb or Zr element meets relational expression in the composition of the bolting steel：0.20≤V (%)+0.5Mo
(%)+0.5Nb (Zr) (%)≤0.30.
4. the high strength bolting steel of atmospheric corrosion resistance and excellent in resistance to delayed fracture, feature exist according to claim 1
In atmospheric corrosion resistance sex index I >=6.5 of the bolting steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810357699.5A CN108754303A (en) | 2018-04-20 | 2018-04-20 | A kind of high strength bolting steel of atmospheric corrosion resistance and excellent in resistance to delayed fracture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810357699.5A CN108754303A (en) | 2018-04-20 | 2018-04-20 | A kind of high strength bolting steel of atmospheric corrosion resistance and excellent in resistance to delayed fracture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108754303A true CN108754303A (en) | 2018-11-06 |
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| CN201810357699.5A Pending CN108754303A (en) | 2018-04-20 | 2018-04-20 | A kind of high strength bolting steel of atmospheric corrosion resistance and excellent in resistance to delayed fracture |
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Cited By (8)
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| CN109252012A (en) * | 2018-11-08 | 2019-01-22 | 南京钢铁股份有限公司 | A kind of Weather-resistance bridge steel and smelting process |
| CN110468328A (en) * | 2019-08-05 | 2019-11-19 | 洛阳双瑞特种装备有限公司 | A kind of steel structure bolt steel |
| CN110983199A (en) * | 2019-11-07 | 2020-04-10 | 包头钢铁（集团）有限责任公司 | Rare earth low-temperature-resistant high-strength bolt steel and preparation method thereof |
| CN111155031A (en) * | 2020-01-15 | 2020-05-15 | 南京福贝尔五金制品有限公司 | Atmospheric corrosion resistant high-strength bolt and manufacturing method thereof |
| CN111676423A (en) * | 2020-06-28 | 2020-09-18 | 马鞍山钢铁股份有限公司 | Steel for 12.9-grade large-size high-toughness wind power bolt and production method thereof |
| CN112695241A (en) * | 2020-11-25 | 2021-04-23 | 南京钢铁股份有限公司 | 12.9-grade anti-delayed fracture weather-resistant bolt steel and preparation method thereof |
| WO2022247855A1 (en) | 2021-05-28 | 2022-12-01 | 宝山钢铁股份有限公司 | Steel for bolts, and manufacturing method therefor |
| CN117187687A (en) * | 2023-08-18 | 2023-12-08 | 江苏沙钢集团淮钢特钢股份有限公司 | High-performance steel for bolts and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109252012A (en) * | 2018-11-08 | 2019-01-22 | 南京钢铁股份有限公司 | A kind of Weather-resistance bridge steel and smelting process |
| WO2020093688A1 (en) * | 2018-11-08 | 2020-05-14 | 南京钢铁股份有限公司 | Weather-resistant bridge steel and smelting process |
| CN110468328A (en) * | 2019-08-05 | 2019-11-19 | 洛阳双瑞特种装备有限公司 | A kind of steel structure bolt steel |
| CN110983199A (en) * | 2019-11-07 | 2020-04-10 | 包头钢铁（集团）有限责任公司 | Rare earth low-temperature-resistant high-strength bolt steel and preparation method thereof |
| CN110983199B (en) * | 2019-11-07 | 2021-06-22 | 包头钢铁（集团）有限责任公司 | Rare earth low-temperature-resistant high-strength bolt steel and preparation method thereof |
| CN111155031A (en) * | 2020-01-15 | 2020-05-15 | 南京福贝尔五金制品有限公司 | Atmospheric corrosion resistant high-strength bolt and manufacturing method thereof |
| CN111676423A (en) * | 2020-06-28 | 2020-09-18 | 马鞍山钢铁股份有限公司 | Steel for 12.9-grade large-size high-toughness wind power bolt and production method thereof |
| CN111676423B (en) * | 2020-06-28 | 2021-12-14 | 马鞍山钢铁股份有限公司 | Steel for 12.9-grade large-size high-toughness wind power bolt and production method thereof |
| CN112695241A (en) * | 2020-11-25 | 2021-04-23 | 南京钢铁股份有限公司 | 12.9-grade anti-delayed fracture weather-resistant bolt steel and preparation method thereof |
| WO2022247855A1 (en) | 2021-05-28 | 2022-12-01 | 宝山钢铁股份有限公司 | Steel for bolts, and manufacturing method therefor |
| CN117187687A (en) * | 2023-08-18 | 2023-12-08 | 江苏沙钢集团淮钢特钢股份有限公司 | High-performance steel for bolts and production method thereof |
| CN117187687B (en) * | 2023-08-18 | 2024-07-09 | 江苏沙钢集团淮钢特钢股份有限公司 | High-performance steel for bolts and production method thereof |
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