CN105543681B - Containing 10.9 grades of track traffic Mobile Equipment steel for fastener of vanadium and its Technology for Heating Processing - Google Patents
Containing 10.9 grades of track traffic Mobile Equipment steel for fastener of vanadium and its Technology for Heating Processing Download PDFInfo
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- CN105543681B CN105543681B CN201510972010.6A CN201510972010A CN105543681B CN 105543681 B CN105543681 B CN 105543681B CN 201510972010 A CN201510972010 A CN 201510972010A CN 105543681 B CN105543681 B CN 105543681B
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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
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The present invention provides 10.9 grades of track traffic Mobile Equipment fasteners containing vanadium, mainly includes following weight/mass percentage composition (%) chemical element：C 0.33~0.38%, Si 0.05~0.10%, Mn 0.70~0.90%, Cr 0.70~0.90%, Ni 0.30~0.60%, Mo 0.20~0.30%, Als 0.015~0.045%, V 0.06~0.10%, [N] 0.006~0.010%, P≤0.010%, S≤0.005%, T [O]≤0.0015%；The autstenitic grain size of steel is more than 10.0 grades after heat treatment；Steel is organized as on tempered sorbite matrix Dispersed precipitate tiny pro-eutectoid ferrite on a small quantity after heat treatment, wherein, the proeutectoid ferrite scale of construction≤5%, size≤5 μm.
Description
Technical field
The invention belongs to field of alloy steel, especially 10.9 grades of track traffic Mobile Equipment steel for fastener and its heat treatment
Technique.
Background technology
Fastener is commercially also referred to as standard component, is to be fastenedly connected into two or more parts (or component)
For an entirety when used a kind of machine components general name.Its feature is that description is various, and performance purposes is different, and
It is and standardization, seriation, unitized strong.Fastener is most widely used mechanical basic part, is in great demand.It is high
The strength level of the high-intensity fasteners such as strength bolts is generally divided into 8.8,9.8,10.9 and 12.9 4 ranks, usually quenched
The medium carbon steel or medium carbon alloy steel of processing.
With the high speed of track traffic, heavy loading, key components and parts are hit and vibrations significantly increase, and fatigue rupture turns into
Its principal mode to fail, low-temperature impact toughness, fatigue behaviour requirement to steel significantly improve, are badly in need of low-temperature impact-resistant, resist
The steel for fastener of excelling in fatigue property.To ensure the low-temperature impact-resistant of fastener, anti-fatigue performance, at present, China is at a high speed, again
Track traffic Mobile Equipment is carried with 10.9 grades, 12.9 grades of steel for fastener more using 4340,40CrNiMo and 18Cr2Ni4WE etc.
High alloy-structural steel, production difficulty is big, and the consumption of the noble alloy such as Ni, Mo is big, and production cost is high, and most import.
The content of the invention
The problem of to overcome prior art to exist, the present invention provide 10.9 grades of track traffic Mobile Equipment fasteners containing vanadium
With steel and its Technology for Heating Processing, meeting track traffic Mobile Equipment high-strength and high ductility fastener low-temperature impact-resistant, fatigue resistance
Can while, can rationally, balancedly utilize resource, using less alloy adding, reduction production cost and production
Difficulty.
Used in order to solve the above technical problems, the present invention provides a kind of 10.9 grades of track traffic Mobile Equipments containing vanadium with fastener
Steel, include following weight/mass percentage composition (%) chemical element：C0.33~0.38%, Si0.05~0.10%, Mn0.70~
0.90%, Cr0.70~0.90%, Ni0.30~0.60%, Mo0.20~0.30%, Als0.015~0.045%, V0.06~
0.10%, [N] 0.006~0.010%, Ca0.001~0.005%, P≤0.010%, S≤0.005%, T [O]≤
0.0015%, surplus is iron and inevitable impurity；Steel after the fastener heat treatment prepared using the steel for fastener
Dispersed precipitate tiny pro-eutectoid ferrite on a small quantity is organized as on tempered sorbite matrix, wherein, the proeutectoid ferrite scale of construction≤5%,
Size≤5 μm.
The present invention also provides a kind of rolling mill practice of the steel for fastener of 10.9 grades of track traffic Mobile Equipments containing vanadium：Steel
Base heating-up temperature presses 1050-1250 DEG C of scope control, and thick, middle mill milling is completed more than 1000 DEG C, and finishing mill uses low temperature
Controlled rolling, control is cold to use retarded cooling process；The steel billet chemical composition (mass percent %) is C0.33~0.38%,
Si0.05~0.10%, Mn0.70~0.90%, Cr0.70~0.90%, Ni0.30~0.60%, Mo0.20~0.30%,
Als0.015~0.045%, V0.06~0.10%, [N] 0.006~0.010%, Ca0.001~0.005%, P≤
0.010%, S≤0.005%, T [O]≤0.0015%, surplus are iron and inevitable impurity.
The present invention also provides a kind of Technology for Heating Processing of 10.9 grades of track traffic Mobile Equipment fasteners containing vanadium, described to contain
10.9 grades of track traffic Mobile Equipments of vanadium are with the Technology for Heating Processing of fastener：+ 690~750 DEG C of quenchings of 890~920 DEG C of quenchings+
530~630 DEG C of tempering；The fastener chemical composition (mass percent %) is C0.33~0.38%, Si0.05~
0.10%, Mn0.70~0.90%, Cr0.70~0.90%, Ni0.30~0.60%, Mo0.20~0.30%, Als0.015~
0.045%, V0.06~0.10%, [N] 0.006~0.010%, Ca0.001~0.005%, P≤0.010%, S≤
0.005%, T [O]≤0.0015%, surplus are iron and inevitable impurity.
One kind 10.9 grades of track traffic Mobile Equipment fasteners containing vanadium provided by the invention, mainly comprising following quality hundred
Divide the chemical element of content (%)：C0.33~0.38%, Si0.05~0.10%, Mn0.70~0.90%, Cr0.70~
0.90%, Ni0.30~0.60%, Mo0.20~0.30%, Als0.015~0.045%, V0.06~0.10%, [N] 0.006
~0.010%, Ca0.001~0.005%, P≤0.010%, S≤0.005%, T [O]≤0.0015%, surplus is for iron and not
Evitable impurity；The autstenitic grain size of steel is more than 10.0 grades after the fastener heat treatment；The fastener heat treatment
Steel are organized as on tempered sorbite matrix Dispersed precipitate tiny pro-eutectoid ferrite on a small quantity afterwards, wherein, pro-eutectoid ferrite
Amount≤5%, size≤5 μm；Vertical mixing coefficient is after the fastener heat treatment：Rm1050MPa~1200MPa, Rp0.2 >=
950MPa, A >=10%, Z >=50%, -40 DEG C of impacts of collision absorb work(KU2 >=80J, tired under the conditions of 550MPa pulsating stresses
Life-span >=10,000,000 time.
Design of Chemical Composition thought of the present invention is as follows：
(1) on the basis of 40CrNiMo steel, the appropriate C element content reduced in steel for fastener, improve steel toughness and
Plasticity；(2) it is properly added nickel element and adds micro vanadium, nitrogen, to improve the quenching degree of steel and crystal grain thinning, improves steel
Toughness particularly low-temperature flexibility, and improve the intensity of steel and toughness coordinates, improve the anti-fatigue performance of steel；(3) add appropriate
Ca elements, carry out denaturation treatment to the field trash in steel, at the same in strict control steel impurity element T [O], P, S etc. content,
Further to improve the anti-fatigue performance of steel.The present invention's it is critical that optimizing components adjustment and metallurgical quality control are had
Combine machine, while high intensity is obtained, obtain excellent low-temperature impact-resistant, antifatigue destructive characteristics and it is relatively low into
This.
Steel of the present invention comprising chemical element (weight %) it is as follows：C：0.33~0.38, Si：0.05~0.10, Mn：0.70
~0.90, Cr：0.70~0.90, Ni：0.30~0.60, Mo：0.20~0.30, Als：0.015~0.045, V：0.06~
0.10, [N]：0.006~0.010, Ca：0.001~0.005, P≤0.010, S≤0.005, T [O]≤0.0015, it is remaining for Fe and
Other inevitable impurity.
The effect of above-mentioned each element and proportioning are according to as follows：
C：C element is necessary to high-intensity fasteners steel obtains high intensity.Although high C content is to the intensity of steel
Deng favourable, but the cold heading performance to steel, plasticity and toughness are totally unfavorable, and reduce yield tensile ratio, Decarburization Sensitivity increase, deteriorate
The anti-fatigue performance and processing characteristics of steel.Therefore the appropriate C content reduced in steel, is controlled 0.33~0.38%.
Si：Si is deoxidant element main in steel, has very strong solution strengthening effect, but silicon can significantly improve the change of steel
Shape drag, it is totally unfavorable to cold heading and cold extruding, and Si too high levels decline the plasticity for making steel and toughness, deteriorate the anti-tired of steel
Labor performance, therefore silicone content should not be too high, therefore it is 0.05~0.10% to control Si contents.
Mn：Mn is the effective element of deoxidation, can also improve the quenching degree and intensity of steel.It is difficult when content is less than 0.70%
To function as described above.But when quenching temper, Mn and P have strong grain boundary cosegregation tendency, promote temper brittleness, deteriorate steel
Toughness, thus control Mn contents below 0.90%.
Cr：Cr can effectively improve the quenching degree and resistance to tempering of steel, to obtain required high intensity；Cr may be used also simultaneously
C activity is reduced, the steel surface decarburizing tendency in heating, rolling and heat treatment process can be reduced, has utilization to obtain high resist
Fatigue behaviour, but too high levels can deteriorate the toughness of steel, thus it is 0.70~0.90% to control Cr contents.
Ni：Ni can improve the quenching degree of steel, the toughness of corrosion resistance and guarantee steel at low temperature.In view of economy, control
Ni contents are 0.30~0.60%.
Mo：Effects of the Mo in steel predominantly improves quenching degree, improves resistance to tempering and prevent temper brittleness.In addition, Mo
The reasonable cooperation of element and Cr elements can make quenching degree and resistance to tempering be improved significantly.Mo contents are too low, and above-mentioned effect has
Limit, Mo too high levels, then above-mentioned effect saturation, and improve the cost of steel.Therefore, it is 0.20~0.30% to control Mo contents.
V：V is strong carbon, nitride forming element, when formed small and dispersed carbide is combined with C, N can prevent heating
Crystal grain is grown up, and plays refined crystalline strengthening and precipitation strength, so as to improve the intensity, toughness and anti-fatigue performance of steel simultaneously.V
Content is less than 0.06%, above-mentioned effect unobvious；V content is higher than 0.10%, above-mentioned effect saturation, and improves the cost of steel.Cause
And it is 0.06~0.10% to control V content.
[N]：Nitrogen pick-up promotes precipitation of the vanadium carbide nitride in austenite, ferrite in V-alloyed steel, is not only analysed in vanadium nitrogen steel
Go out phase amount to dramatically increase, and also substantially (precipitate size is more tiny, and its precipitation strength acts on just for refinement for the size of precipitated phase
It is stronger)；Meanwhile nitrogen pick-up effectively prevents ferrite crystal grain to grow up in V-alloyed steel, play a part of fining ferrite grains.Two
Person's collective effect, effectively increase the intensity and toughness plasticity of steel.Consider, the range-controllable system of [N] 0.006%~
0.010%.
Ca：Ca has the function that deoxidization desulfuration and to non-metallic inclusion denaturation treatment, so as to improve the toughness of steel and resist
Fatigue behaviour.Ca contents do not have above-mentioned effect less than 0.001%, but content is more than 0.005%, then add it is extremely difficult, and
It is mingled with object amount to increase.It is 0.001~0.005% thus to control Ca contents.
P：P can form microsegregation in solidification of molten steel, and then when austenitizing temperature heats, segregation in crystal boundary, makes steel
Fragility significantly increase, so control P content below 0.010%.
S：Inevitable impurity in steel, form MnS and be mingled with and can deteriorate the toughness of steel and antifatigue in Grain Boundary Segregation
Performance, thus its content is controlled below 0.005%.
T[O]：Oxygen forms various oxides in steel and is mingled with.It is easy at these oxide places of being mingled with the presence of stress
Stress concentration is produced, causes the germinating of micro-crack, so as to deteriorate the mechanical property of steel particularly toughness and anti-fatigue performance.Cause
This, must take measures to reduce its content as far as possible in metallurgical production.In view of economy, control its content 0.0015% with
Under.
The present invention the technological process of production be：Converter or electric furnace smelting → external refining → continuously pour into steel billet → high speed
Wire rod low temperature controlled rolling cool controlled rolling → drawing → annealing → drawing → cold-heading → Tempering and Quenching → coating.
Qualified rolling raw material steel billet can be obtained by above-mentioned smelting step.In order to rolling mill practice needs and make carbon, nitrogen
Compound is solid-solution in austenite, and billet heating temperature presses 1050-1250 DEG C of scope control during rolling.Completed more than 1000 DEG C
Slightly, middle mill milling, i.e., completed substantially in austenite recrystallization area rolling be in order to realize recrystallization softening, and it is existing it is thick, in
Roll steel rolling equipment and technique is easily realized.Finishing mill uses low temperature rolling, is advantageous to further refine final product group
Knit.Control it is cold use retarded cooling process, with obtain softening tissue in favor of drawing.Pass through annealing, drawing, cold-heading, Tempering and Quenching
Deng, 10.9 grades of fasteners are made, wherein, Technology for Heating Processing be using 890~920 DEG C quenching+690~750 DEG C quenching+530~
630 DEG C of tempering.
The 10.9 grades of fasteners produced using the chemical composition of the present invention, technological process, determine longitudinal mechanics of fastener
Performance can reach：Rm：1050MPa~1200MPa, Rp0.2>=950MPa, A >=10%, Z >=50%, -40 DEG C of impacts of collision absorb
Work(KU2>=80J, fatigue life >=10,000,000 time under the conditions of 550MPa pulsating stresses；The autstenitic grain size of steel be more than etc.
In 10.0 grades；Steel is organized as on tempered sorbite matrix Dispersed precipitate tiny pro-eutectoid iron on a small quantity after fastener Tempering and Quenching
Ferritic (a small amount of tiny pro-eutectoid ferrite can suppress crack Propagation, improve anti-fatigue performance), wherein, pro-eutectoid ferrite
Amount≤5%, size≤5 μm.
The present invention has the advantages of intensity height, low-temperature impact-resistant, excellent anti-fatigue performance compared with prior art.It can obtain
More than 1050MPa high intensity, its plasticity, toughness and anti-fatigue performance are substantially better than business steel, and it is tough to show good intensity
Property coordinate and excellent anti-fatigue performance.Wherein, tensile strength >=1050MPa, yield strength >=950MPa, longitudinal direction at -40 DEG C
Impact absorbing energy KU2>=80J, fatigue life >=10,000,000 time under the conditions of 550MPa pulsating stresses.
Embodiment
Following embodiment is used to illustrate the present invention, but protection scope of the present invention is not limited in following examples.
The present invention the technological process of production be：Converter or electric furnace smelting → external refining → continuously pour into steel billet → high speed
Wire rod low temperature controlled rolling cool controlled rolling → drawing → annealing → drawing → cold-heading → Tempering and Quenching → coating.
The melting chemical compositions of 10.9 grades of track traffic Mobile Equipment high-strength and high ductility fasteners containing vanadium of the invention, performance
Embodiment is as follows：
Specification be M8~M24 10.9 grades of track traffic Mobile Equipment high-strength and high ductility steel for fastener melting chemistry into
Point mass percent (wt%) is shown in Table 1,10.9 grades of track traffic Mobile Equipments with after high-strength and high ductility fastener Tempering and Quenching
Performance indications are shown in Table 2.
The melting chemical composition quality percentage of table 1 10.9 grades of track traffic Mobile Equipments high-strength and high ductility steel for fastener
Than (wt%)
2 10.9 grades of track traffic Mobile Equipments of table performance indications after high-strength and high ductility fastener Tempering and Quenching
Claims (4)
1. a kind of 10.9 grades of track traffic Mobile Equipment steel for fastener containing vanadium, it is characterised in that include following quality percentage
The chemical element of content (%)：C0.33~0.38%, Si0.05~0.10%, Mn0.70~0.90%, Cr0.70~
0.90%, Ni0.30~0.60%, Mo0.20~0.30%, Als0.015~0.045%, V0.06~0.10%, [N] 0.006
~0.010%, Ca0.001~0.005%, P≤0.010%, S≤0.005%, T [O]≤0.0015%, surplus is for iron and not
Evitable impurity；Steel is organized as on tempered sorbite matrix after the fastener heat treatment prepared using the steel for fastener
Dispersed precipitate tiny pro-eutectoid ferrite on a small quantity, wherein, the proeutectoid ferrite scale of construction≤5%, size≤5 μm.
A kind of 2. rolling mill practice of the steel for fastener of 10.9 grades of track traffic Mobile Equipments containing vanadium, it is characterised in that steel billet
Heating-up temperature presses 1050-1250 DEG C of scope control, and thick, middle mill milling is completed more than 1000 DEG C, and finishing mill uses low temperature control
System rolling, control is cold to use retarded cooling process；The chemical composition of the steel for fastener includes the change of following weight/mass percentage composition (%)
Learn element：C0.33~0.38%, Si0.05~0.10%, Mn0.70~0.90%, Cr0.70~0.90%, Ni0.30~
0.60%, Mo0.20~0.30%, Als0.015~0.045%, V0.06~0.10%, [N] 0.006~0.010%,
Ca0.001~0.005%, P≤0.010%, S≤0.005%, T [O]≤0.0015%, surplus be iron and inevitably it is miscellaneous
Matter.
A kind of 3. Technology for Heating Processing of 10.9 grades of track traffic Mobile Equipment fasteners containing vanadium, it is characterised in that the fastening
The Technology for Heating Processing of part is：890~920 DEG C of+690~750 DEG C of quenching+530~630 DEG C of quenching tempering；The change of the fastener
Study the chemical element that subpackage contains following weight/mass percentage composition (%)：C0.33~0.38%, Si0.05~0.10%, Mn0.70
~0.90%, Cr0.70~0.90%, Ni0.30~0.60%, Mo0.20~0.30%, Als0.015~0.045%, V0.06
~0.10%, [N] 0.006~0.010%, Ca0.001~0.005%, P≤0.010%, S≤0.005%, T [O]≤
0.0015%, surplus is iron and inevitable impurity.
4. a kind of 10.9 grades of track traffic Mobile Equipment fasteners containing vanadium, it is characterised in that include following weight/mass percentage composition
The chemical element of (%)：C0.33~0.38%, Si0.05~0.10%, Mn0.70~0.90%, Cr0.70~0.90%,
Ni0.30~0.60%, Mo0.20~0.30%, Als0.015~0.045%, V0.06~0.10%, [N] 0.006~
0.010%, Ca0.001~0.005%, P≤0.010%, S≤0.005%, T [O]≤0.0015%, surplus are iron and can not
The impurity avoided；The grain size of steel is more than 10.0 grades after the fastener heat treatment；Steel after the fastener heat treatment
Dispersed precipitate tiny pro-eutectoid ferrite on a small quantity is organized as on tempered sorbite matrix, wherein, the proeutectoid ferrite scale of construction≤5%,
Size≤5 μm；Vertical mixing coefficient is after the fastener heat treatment：Rm1050MPa~1200MPa, Rp0.2 >=950MPa, A
>=10%, Z >=50%, -40 DEG C of impacts of collision absorb work(KU2 >=80J, under the conditions of 550MPa pulsating stresses fatigue life >=
10000000 times.
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| CN107964625A (en) * | 2017-11-09 | 2018-04-27 | 石家庄钢铁有限责任公司 | A kind of big specification pallet fork round steel of low-temperature impact-resistant toughness and its production method |
| CN112522492B (en) * | 2020-10-28 | 2022-11-01 | 浙江自紧王机械有限公司 | Heat treatment process for self-tightening nut and self-tightening gasket |
| CN115404399B (en) * | 2021-05-28 | 2023-04-11 | 宝山钢铁股份有限公司 | Homogeneous high-strength durable bolt steel and preparation method thereof |
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| JPS61174322A (en) * | 1985-01-28 | 1986-08-06 | Nippon Steel Corp | Method for softening rolled material of machine structural steel |
| CN1858284A (en) * | 2005-05-01 | 2006-11-08 | 马鞍山钢铁股份有限公司 | Super fine crystal microalloyed medium carbon steel coil and its producing method |
| JP4381355B2 (en) * | 2005-07-22 | 2009-12-09 | 新日本製鐵株式会社 | Steel having excellent delayed fracture resistance and tensile strength of 1600 MPa class or more and method for producing the molded product thereof |
| CN101619414B (en) * | 2009-07-29 | 2011-01-19 | 马鞍山钢铁股份有限公司 | 10.9-grade niobium-containing non-quenched and tempered cold-heading steel and rolling method of hot finished rod thereof |
| CN102260830B (en) * | 2011-07-08 | 2013-03-20 | 宁波市胜源技术转移有限公司 | Method for processing high-strength fastener and hot-treating process |
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