CN108893679A - A kind of 700MPa grades of high-strength screw-thread steel muscle and production method - Google Patents
A kind of 700MPa grades of high-strength screw-thread steel muscle and production method Download PDFInfo
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- CN108893679A CN108893679A CN201810638093.9A CN201810638093A CN108893679A CN 108893679 A CN108893679 A CN 108893679A CN 201810638093 A CN201810638093 A CN 201810638093A CN 108893679 A CN108893679 A CN 108893679A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 67
- 239000010959 steel Substances 0.000 title claims abstract description 67
- 210000003205 muscle Anatomy 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 41
- 239000000203 mixture Substances 0.000 claims abstract description 16
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 15
- 239000012535 impurity Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims abstract description 14
- 238000009628 steelmaking Methods 0.000 claims abstract description 12
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 9
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 9
- 238000010079 rubber tapping Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 239000002344 surface layer Substances 0.000 claims description 7
- 238000007670 refining Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 9
- 150000001875 compounds Chemical class 0.000 description 8
- 230000003014 reinforcing effect Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 6
- 229910001562 pearlite Inorganic materials 0.000 description 5
- 238000005728 strengthening Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- -1 heating Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a kind of 700MPa grades of high-strength screw-thread steel muscle and production method, high-strength screw-thread steel muscle chemical component composition and mass percentage are：C：0.26~0.31%, Si：0.50~0.80%, Mn：1.40~1.60%, V：0.140~0.220%, Nb：0.010~0.020%, B：0.0008~0.0040%, P≤0.040%, S≤0.040%, N：200~350ppm, surplus are Fe and inevitable impurity；Production method includes steel-making, heating, steel rolling and heat treatment procedure.Surface of reinforced bar of the present invention forms cyclic annular tempered structure, and inside is ferrite+pearlitic structrure, and obdurability matching is good, yield strength Rel >=700MPa of product, tensile strength Rm >=850MPa, elongation after fracture A >=14%, maximum, force percentage of total elongation Agt >=7.5%.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of 700MPa grades of high-strength screw-thread steel muscle and production method.
Background technique
Domestic construction generallys use 400/500MPa grades of spirals with reinforcing bar at present, to save material, reduces cost, state
External building class reinforcing bar has reached 700MPa rank, if South Korea, Russia have put into effect 700MPa rebar standards, according to intensitometer
It calculates, compared with 400MPa reinforcing bar, 60% or more can be saved, China puts into effect respective standard not yet, but in the long run, builds
With reinforcing bar to high-strength development and inexorable trend, therefore it is imperative to develop high tensile reinforcement.
Summary of the invention：
The technical problem to be solved in the present invention is to provide a kind of 700MPa grades of high-strength screw-thread steel muscle and production methods.
In order to solve the above technical problems, the technical solution adopted by the present invention is that：A kind of 700MPa grades of high-strength screw-thread steel muscle, institute
It states high-strength screw-thread steel muscle chemical component composition and its mass percentage is：C：0.26~0.31%, Si：0.50~0.80%, Mn：
1.40~1.60%, V：0.140~0.220%, Nb：0.010~0.020%, B：0.0008~0.0040%, P≤0.040%, S≤
0.040%, N：200~350ppm, surplus are Fe and inevitable impurity.
Each chemical component composition of the present invention and the mechanism of action：
C can play solution strengthening effect, be to improve the one of the chief elements of steel strength, and belong to cheap element, but C contains
Measure it is excessively high can deteriorate plasticity index, through practicing, C mass fraction be 0.26~0.31%.
Si can play solution strengthening effect, improve steel strength, increase elastic limit, while being a kind of deoxidier, reduce
Type impurity is aoxidized, but Si too high levels can influence plasticity, through practicing, Si mass fraction is 0.50~0.80%.
Mn can play solution strengthening effect, equally be to improve the essential element of steel strength, but Mn too high levels can shadow
Plasticity is rung, through practicing, Mn mass fraction is 1.40~1.60%.
V is main intensified element, and the C/N compound of formation has strong pinning effect to crystal boundary and dislocation, and can
Crystal grain is refined, intensity can be significantly improved, especially have larger contribution to yield strength, due to influencing each other between element, to V
The precipitation of C/N compound play the role of inhibiting effect, excessive vanadium does not have precipitation strength, reduction strengthening effect, through reality
It tramples, V mass fraction is 0.140~0.220%.
The C/N compound of Nb can play the role of precipitation strength, while can postpone ferritic transformation, increase pearlite and contain
Amount, and it is capable of forming a small amount of acicular ferrite, increase intensity and is similarly subjected to since the C/N compound Precipitation Temperature of Nb is higher
Influencing each other between element plays inhibiting effect to the precipitation of the C/N compound of Nb, through practicing, Nb mass fraction is 0.010~
0.020%。
B element can increase harden ability, can strengthen and wear water effect after rolling, but excessively high B element, can reduce reinforcing bar modeling
Property, it is practiced, B mass fraction is 0.0008~0.0040%.
S/P is harmful element, damages steel plasticity, and cost can be increased significantly by crossing low content, through practicing, S/P mass fraction
≤0.040%。
N element can form the compound of V, Nb, strengthen and effect is precipitated, and excessive N element reduces steel elongation, through reality
It tramples, the content of N is 200~350ppm.
High-strength screw-thread steel muscle of the present invention surface layer is cyclic annular tempered structure, and inside is ferrite+pearlitic structrure.
High-strength screw-thread steel muscle of the present invention：Yield strength Rel >=700MPa, tensile strength Rm >=850MPa, has no progeny and stretches
Long rate A >=14%, maximum, force percentage of total elongation Agt >=7.5%.
The present invention also provides a kind of production method of 700MPa grades of high-strength screw-thread steel muscle, the production method includes refining
Steel, heating, steel rolling and heat treatment procedure.
Steel making working procedure of the present invention, tapping ladle chemistry composition and its mass percentage are：C：0.26~
0.31%, Si：0.50~0.80%, Mn：1.40~1.60%, V：0.140~0.220%, Nb：0.010~0.020%, B：0.0008
~0.0040%, P≤0.040%, S≤0.040%, N：200~350ppm, surplus are Fe and inevitable impurity.
Heating process of the present invention, tapping temperature is 1100~1200 DEG C after blank heating.
Steel rolling process of the present invention uses Water cooling, 1~3MPa of hydraulic pressure, flow >=300m after finish to gauge3/ h is upper cold
It is 550~650 DEG C that bed, which throws steel temperature, heap is cold >=for 24 hours after be heat-treated.
Heat treatment procedure of the present invention, heating temperature are 150~450 DEG C, keep the temperature 10~30h.
Production technology of the present invention formulates foundation：
Blank temperature will have a direct impact on compound precipitation, classes of compounds can be promoted to be precipitated under the condition of high temperature, improve steel strength,
But excessive temperature will increase reinforcing bar brittleness, can also damage to heating furnace li`, therefore, blank tapping temperature is after heating
1100~1200 DEG C.
Using hydraulic art is worn again after finish to gauge, cyclic annular tempered structure is formed in surface of reinforced bar, to reinforcing bar inside, can inhibit to tie again
Crystalline substance refines crystal grain, increases intensity, improves plasticity, and through practicing, it is 550~650 DEG C that upper cold bed, which throws steel temperature,.
Is heat-treated after heap is cold, removes residual stress, can be improved plasticity, improve toughness, excessive temperature increase at
This, reduces steel strength, and through practicing, heating temperature is 150~450 DEG C, keeps the temperature 10~30h.
700MPa grades of high-strength screw-thread steel muscle product standard of the present invention refers to GB13014；Product inspection method refers to GB/
T228.1。
Generated beneficial effect is by adopting the above technical scheme：1, the present invention is in steelmaking process control composition, control
Blank tapping temperature is 1100~1200 DEG C, Water cooling is used after finish to gauge, it is 550~650 DEG C that upper cold bed, which throws steel temperature, in steel
Muscle surface layer forms cyclic annular tempered structure, and inside is ferrite+pearlitic structrure.2, the present invention is heat-treated after heap is cold,
Controlling heating temperature is 150~450 DEG C, keeps the temperature 10~30h, sufficiently removal residual stress, improves plastic property of reinforcement rebar.3, steel of the present invention
There is muscle good obdurability to match, and yield strength Rel >=700MPa of product, tensile strength Rm >=850MPa have no progeny and stretch
Long rate A >=14%, maximum, force percentage of total elongation Agt >=7.5%.
Specific embodiment
The present invention will be further described in detail combined with specific embodiments below.
Embodiment 1
700MPa grades of high-strength screw-thread steel muscle chemical component compositions of the present embodiment and its mass percentage are：C：0.31%, Si：
0.80%, Mn：1.60%, V：0.145%, Nb：0.010%, B：0.0008%, P：0.018%, S：0.022%, N：225ppm, surplus are
Fe and inevitable impurity.
700MPa grades of high-strength screw-thread steel muscle production methods of the present embodiment include steel-making, heating, steel rolling and heat treatment procedure, tool
That steps are as follows is described for body technology：
（1）Steel-making：Tapping ladle chemistry composition and its mass percentage are：C：0.31%, Si：0.80%, Mn：1.60%,
V：0.145%, Nb：0.010%, B：0.0008%, P：0.018%, S：0.022%, N：225ppm, surplus is for Fe and inevitably
Impurity；
（2）Heating：Tapping temperature is 1100 DEG C after blank heating；
（3）Steel rolling：Water cooling, hydraulic pressure 1MPa, flow 300M are used after finish to gauge3/ h, it is 650 DEG C that upper cold bed, which throws steel temperature, heap
It is cold to be heat-treated later for 24 hours；
（4）Heat treatment：Being heat-treated heating temperature is 150 DEG C, keeps the temperature 30h.
700MPa grades of high-strength screw-thread steel muscle surface layers of the present embodiment are cyclic annular tempered structure, and inside is ferrite+pearlite group
It knits；Performance indicator：Yield strength Rel：720MPa, tensile strength Rm：885MPa, elongation after fracture A：16%, maximum, force general extension
Rate Agt：9.5%.
Embodiment 2
700MPa grades of high-strength screw-thread steel muscle chemical component compositions of the present embodiment and its mass percentage are：C：0.26%, Si：
0.50%, Mn：1.40%, V：0.220%, Nb：0.020%, B：0.0040%, P：0.026%, S：0.018%, N：350ppm, surplus are
Fe and inevitable impurity.
700MPa grades of high-strength screw-thread steel muscle production methods of the present embodiment include steel-making, heating, steel rolling and heat treatment procedure, tool
That steps are as follows is described for body technology：
（1）Steel-making：Tapping ladle chemistry composition and its mass percentage are：C：0.26%, Si：0.50%, Mn：1.40%,
V：0.220%, Nb：0.020%, B：0.0040%, P：0.026%, S：0.018%, N：350ppm, surplus is for Fe and inevitably
Impurity；
（2）Heating：Tapping temperature is 1200 DEG C after blank heating；
（3）Steel rolling：Water cooling, hydraulic pressure 3MPa, flow 900M are used after finish to gauge3/ h, it is 550 DEG C that upper cold bed, which throws steel temperature, heap
It is heat-treated after cold 30h；
（4）Heat treatment：Being heat-treated heating temperature is 450 DEG C, keeps the temperature 10h.
700MPa grades of high-strength screw-thread steel muscle surface layers of the present embodiment are cyclic annular tempered structure, and inside is ferrite+pearlite group
It knits；Performance indicator：Yield strength Rel：775MPa, tensile strength Rm：935MPa, elongation after fracture A：15%, maximum, force general extension
Rate Agt：10.1%.
Embodiment 3
700MPa grades of high-strength screw-thread steel muscle chemical component compositions of the present embodiment and its mass percentage are：C：0.29%, Si：
0.66%, Mn：1.50%, V：0.190%, Nb：0.015%, B：0.0025%, P：0.031%, S：0.028%, N：300ppm, surplus are
Fe and inevitable impurity.
700MPa grades of high-strength screw-thread steel muscle production methods of the present embodiment include steel-making, heating, steel rolling and heat treatment procedure, tool
That steps are as follows is described for body technology：
（1）Steel-making：Tapping ladle chemistry composition and its mass percentage are：C：0.29%, Si：0.66%, Mn：1.50%,
V：0.190%, Nb：0.015%, B：0.0025%, P：0.031%, S：0.028%, N：300ppm, surplus is for Fe and inevitably
Impurity；
（2）Heating：Tapping temperature is 1150 DEG C after blank heating；
（3）Steel rolling：Water cooling, hydraulic pressure 2MPa, flow 800M are used after finish to gauge3/ h, it is 600 DEG C that upper cold bed, which throws steel temperature, heap
It is heat-treated after cold 35h；
（4）Heat treatment：Being heat-treated heating temperature is 300 DEG C, keeps the temperature 20h.
700MPa grades of high-strength screw-thread steel muscle surface layers of the present embodiment are cyclic annular tempered structure, and inside is ferrite+pearlite group
It knits；Performance indicator：Yield strength Rel：760MPa, tensile strength Rm：930MPa, elongation after fracture A：17%, maximum, force general extension
Rate Agt：10.6%.
Embodiment 4
700MPa grades of high-strength screw-thread steel muscle chemical component compositions of the present embodiment and its mass percentage are：C：0.27%, Si：
0.73%, Mn：1.46%, V：0.140%, Nb：0.013%, B：0.0016%, P：0.040%, S：0.040%, N：200ppm, surplus are
Fe and inevitable impurity.
700MPa grades of high-strength screw-thread steel muscle production methods of the present embodiment include steel-making, heating, steel rolling and heat treatment procedure, tool
That steps are as follows is described for body technology：
（1）Steel-making：Tapping ladle chemistry composition and its mass percentage are：C：0.27%, Si：0.73%, Mn：1.46%,
V：0.140%, Nb：0.013%, B：0.0016%, P：0.040%, S：0.040%, N：200ppm, surplus is for Fe and inevitably
Impurity；
（2）Heating：Tapping temperature is 1170 DEG C after blank heating；
（3）Steel rolling：Water cooling, hydraulic pressure 1.5MPa, flow 750M are used after finish to gauge3/ h, it is 580 DEG C that upper cold bed, which throws steel temperature,
It is heat-treated after the cold 50h of heap；
（4）Heat treatment：Being heat-treated heating temperature is 270 DEG C, keeps the temperature 25h.
700MPa grades of high-strength screw-thread steel muscle surface layers of the present embodiment are cyclic annular tempered structure, and inside is ferrite+pearlite group
It knits；Performance indicator：Yield strength Rel：710MPa, tensile strength Rm：890MPa, elongation after fracture A：16%, maximum, force general extension
Rate Agt：9.5%.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that：Still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (8)
1. a kind of 700MPa grades of high-strength screw-thread steel muscle, which is characterized in that the high-strength screw-thread steel muscle chemical component composition and its matter
Measuring percentage composition is：C：0.26~0.31%, Si：0.50~0.80%, Mn：1.40~1.60%, V：0.140~0.220%, Nb：
0.010~0.020%, B：0.0008~0.0040%, P≤0.040%, S≤0.040%, N：200~350ppm, surplus be Fe and
Inevitable impurity.
2. a kind of 700MPa grades of high-strength screw-thread steel muscle according to claim 1, which is characterized in that the high-strength screw-thread steel muscle
Surface layer is cyclic annular tempered structure, and inside is ferrite+pearlitic structrure.
3. a kind of 700MPa grades of high-strength screw-thread steel muscle according to claim 1, which is characterized in that the high-strength screw-thread steel
Muscle：Yield strength Rel >=700MPa, tensile strength Rm >=850MPa, elongation after fracture A >=14%, maximum, force percentage of total elongation Agt
≥7.5%。
4. based on a kind of production method of 700MPa grades of high-strength screw-thread steel muscle described in claim 1-3 any one, feature
It is, the production method includes steel-making, heating, steel rolling and heat treatment procedure.
5. a kind of production method of 700MPa grades of high-strength screw-thread steel muscle according to claim 4, which is characterized in that the refining
Steel process, tapping ladle chemistry composition and its mass percentage are：C：0.26~0.31%, Si：0.50~0.80%,
Mn：1.40~1.60%, V：0.140~0.220%, Nb：0.010~0.020%, B：0.0008~0.0040%, P≤0.040%, S
≤ 0.040%, N：200~350ppm, surplus are Fe and inevitable impurity.
6. a kind of production method of 700MPa grades of high-strength screw-thread steel muscle according to claim 4, which is characterized in that described to add
Thermal process, tapping temperature is 1100~1200 DEG C after blank heating.
7. a kind of production method of 700MPa grades of high-strength screw-thread steel muscle, feature according to claim 4-6 any one
It is, the steel rolling process, Water cooling, 1~3MPa of hydraulic pressure, flow >=300m is used after finish to gauge3/ h, upper cold bed throw steel temperature
Be 550~650 DEG C, heap is cold >=for 24 hours after be heat-treated.
8. a kind of production method of 700MPa grades of high-strength screw-thread steel muscle, feature according to claim 4-6 any one
It is, the heat treatment procedure, heating temperature is 150~450 DEG C, keeps the temperature 10~30h.
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| CN201810638093.9A CN108893679B (en) | 2018-06-20 | 2018-06-20 | 700 MPa-level high-strength twisted steel and production method thereof |
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| CN201810638093.9A CN108893679B (en) | 2018-06-20 | 2018-06-20 | 700 MPa-level high-strength twisted steel and production method thereof |
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| CN108893679B CN108893679B (en) | 2020-08-28 |
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| CN110343962A (en) * | 2019-07-26 | 2019-10-18 | 马鞍山钢铁股份有限公司 | A kind of 700Mpa grades or more hot-rolled ribbed high tensile reinforcement steel and its production method |
| CN110814308A (en) * | 2019-11-11 | 2020-02-21 | 芜湖新兴铸管有限责任公司 | High-strength deformed steel bar continuous casting and production process |
| CN112458357A (en) * | 2020-10-22 | 2021-03-09 | 河钢股份有限公司承德分公司 | 700 MPa-level hot-rolled spiral steel and production method thereof |
| CN113444968A (en) * | 2021-06-10 | 2021-09-28 | 广西柳钢华创科技研发有限公司 | HRB400E general speed hot rolling ribbed steel bar with tensile strength above 700Mpa and production method thereof |
| CN114836686A (en) * | 2021-06-10 | 2022-08-02 | 广西柳钢华创科技研发有限公司 | HRB600E normal speed hot rolled ribbed steel bar with yield ratio more than 1.26 |
| CN115852248A (en) * | 2022-09-28 | 2023-03-28 | 马鞍山钢铁股份有限公司 | V-Nb composite microalloyed 650 MPa-level anti-seismic steel bar and production method thereof |
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|---|---|---|---|---|
| CN110343962A (en) * | 2019-07-26 | 2019-10-18 | 马鞍山钢铁股份有限公司 | A kind of 700Mpa grades or more hot-rolled ribbed high tensile reinforcement steel and its production method |
| CN110814308A (en) * | 2019-11-11 | 2020-02-21 | 芜湖新兴铸管有限责任公司 | High-strength deformed steel bar continuous casting and production process |
| CN110814308B (en) * | 2019-11-11 | 2022-03-01 | 芜湖新兴铸管有限责任公司 | High-strength deformed steel bar continuous casting and production process |
| CN112458357A (en) * | 2020-10-22 | 2021-03-09 | 河钢股份有限公司承德分公司 | 700 MPa-level hot-rolled spiral steel and production method thereof |
| CN113444968A (en) * | 2021-06-10 | 2021-09-28 | 广西柳钢华创科技研发有限公司 | HRB400E general speed hot rolling ribbed steel bar with tensile strength above 700Mpa and production method thereof |
| CN113444968B (en) * | 2021-06-10 | 2022-04-12 | 广西柳钢华创科技研发有限公司 | HRB400E general speed hot rolling ribbed steel bar with tensile strength above 700Mpa and production method thereof |
| CN114836686A (en) * | 2021-06-10 | 2022-08-02 | 广西柳钢华创科技研发有限公司 | HRB600E normal speed hot rolled ribbed steel bar with yield ratio more than 1.26 |
| CN114836686B (en) * | 2021-06-10 | 2022-09-13 | 广西柳钢华创科技研发有限公司 | HRB600E normal speed hot rolled ribbed steel bar with strength-to-yield ratio more than 1.26 |
| CN115852248A (en) * | 2022-09-28 | 2023-03-28 | 马鞍山钢铁股份有限公司 | V-Nb composite microalloyed 650 MPa-level anti-seismic steel bar and production method thereof |
| CN115852248B (en) * | 2022-09-28 | 2024-02-23 | 马鞍山钢铁股份有限公司 | V-Nb composite microalloyed 650 MPa-level anti-seismic steel bar and production method thereof |
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| CN108893679B (en) | 2020-08-28 |
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