CN102796945A - Constructional hot-rolled plain steel bar (HPB) 300 hot-rolled wire-rod steel bar and production thereof - Google Patents
Constructional hot-rolled plain steel bar (HPB) 300 hot-rolled wire-rod steel bar and production thereof Download PDFInfo
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Abstract
The invention provides a constructional hot-rolled plain steel bar (HPB) 300 hot-rolled wire-rod steel bar and production of the constructional hot-rolled plain steel bar (HPB) 300 hot-rolled wire-rod steel bar. Through molten steel smelting, molten steel casting, billet controlled rolling and controlled cooling, the constructional HPB300 hot-rolled wire-rod steel bar is produced and comprises the following chemical constituents in percentage by weight: 0.10-0.16% of C, 0.10-0.20% of Si, 0.30-0.55% of Mn, no more than 0.045% of S, no more than 0.045wt% of P and the balance of Fe and unavoidable impurities. A small amount of alloy is added during a tapping process, the contents of Mn and Si in the steel are controlled to be low, a steel rolling process adopts controlled rolling and controlled cooling technologies, the stelmor air cooling function on refining grains is fully exerted, ferrite grains are obviously refined, the grain sizes reach 10.0-11.5 level, and the produced steel bar has the advantages of low cost, high strength, toughness, excellent shock resistance and the like. The low cost industrial production of the constructional HPB300 hot-rolled plain steel bar is realized, the constructional high strength reduction steel production of China is benefited, and the updating and upgrading of construction steel are accelerated.
Description
Technical field
The present invention relates to a kind of HPB300 gren rod reinforcing bar for building and working method, belong to metal material processing and field shaping technique.
Background technology
Concrete reinforcing bars is the maximum kind of consumption in China's steel product, and heat calendering Round Steel Bar wherein is used as stirrup, arrangement of reinforcement use in a large number mainly as the steel bar stress of cast-in-situ floor, is one of ferrous materials that building trade is common, usage quantity is maximum.Fast development along with Chinese national economy and building trade; Heat calendering Round Steel Bar output increases substantially in recent years; Heat calendering Round Steel Bar output reached 1.2 hundred million tons in 2011, accounted for 18% of output of steel, but produced in the market and the heat calendering Round Steel Bar that uses the still plain bar of HPB235 level mostly; Strength grade is low, and resource and energy consumption are serious.In order to accelerate China's steel upgrading for building, promote amphitypy society to make up better, the GB50010-2010 " Code for design of concrete structures " that implemented in 2011 clearly proposes: cancellation HPB235 level plain bar, the HPB300 level plain bar in generation; In addition, adjusted the range of application of reinforcing bar, the longitudinal stress reinforcing bar can adopt the HPB300 reinforcing bar, and stirrup should adopt the HPB300 reinforcing bar.
Reinforced steel bar strength value according to Code for design of concrete structures adopts is calculated, and the HPB300 reinforcing bar is compared with the HPB235 reinforcing bar, designs tensile strength values and has improved closely 14%, can practice thrift rolled steel dosage 10%～15% on year-on-year basis; Because the gluten density of unit surface reduces, improve the cloth muscle of concrete works greatly and tied up efficient, more help concrete pouring operation, reduce reinforcing bar maintenance cost and update cost simultaneously greatly.Present China heat calendering Round Steel Bar output reaches 1.2 hundred million tons, if all adopt HPB300 to substitute HPB235, can practice thrift rolled steel dosage every year more than 1,500 ten thousand tons, has huge social and economic benefit, meets the social growth requirement of national amphitypy.During " 12 ", China will carry out high-strength reduction energetically and use steel production, promote the construction(al)steel upgrading, and " minimizing " will become trend with steel, and this will have the production of force urges HPB300 plain bar.
The technical scheme that relates to hot-rolled reinforced bar at present in the Chinese patent DB is more, but does not still have the HPB300 of relating to plain bar technical scheme application part.
Summary of the invention
The object of the present invention is to provide a kind of low cost HPB300 gren rod for building reinforcing bar and preparation method thereof, and characteristics such as the reinforcing bar of being produced has that cost is low, intensity is high, plasticity and toughness and shock resistance excellence, good combination property.
HPB300 gren rod reinforcing bar for building provided by the invention prepares through following process steps:
A, molten steel are smelted: after molten iron, steel scrap and the pig iron are added the LD oxygen coverter, carry out conventional top bottom blowing, carry out slag making by convention amount adding lime, rhombspar, magnesite ball; Control end point carbon>=0.06wt%, tapping temperature is pressed 1.0kg/t less than 1660 ℃ before the tapping
SteelAmount, add refining slag to ladle bottom; Omnidistance BOTTOM ARGON BLOWING during tapping, control argon flow amount is 20～40NL/min, when the ladle molten steel amount greater than 1/4 the time, in ladle, add following material successively: press 1.0～1.5kg/t
SteelAmount, add the silico-calcium barium composite deoxidant of following mass ratio: Si 26.5wt%, Ca 12.5wt%, Ba 9.5 wt%; By 4.3～8.0kg/t
SteelAmount, adding Mn content is that 66.5wt%, Si content are the silicomanganese of 17.5wt%; By 1.0～1.2kg/t
SteelAmount, adding Si content is the ferrosilicon of 73.5wt%, and reaches at 3/4 o'clock in the ladle molten steel amount and add, to carry out deoxidation alloying; After tapping finishes, to molten steel Argon 4～5 minutes, to promote in the molten steel floating foreign and to get rid of that improve the molten steel cleanliness factor, Argon is pressed 1.0kg/t after finishing
SteelAmount, in ladle, add conventional insulating covering agent after, send continuous casting working procedure;
B, molten steel casting: at tundish temperature is 1535～1550 ℃, and pulling rate is 2.4～2.6m/min, and two cold specific waters are 1.9～2.2L/kg, under the condition that the strand straightening temperature is 980～1030 ℃, the molten steel casting of steps A is become steel billet;
C, steel billet controlled rolling and controlled cooling: it is in 1100～1150 ℃ the process furnace that the steel billet of step B is sent into the soaking zone temperature; Heated 60～80 minutes; The employing high-speed rod-rolling mill is rolled; At the steel billet start rolling temperature is 950～1000 ℃, and speed is under the rolling condition of 0.18～0.28m/s, 6 passages of roughing; Be under the rolling condition of 10.5～15.1 m/s in speed afterwards, in roll 12 passages; At cooling water inflow is 30～60m
3Control is cold 2～3 seconds under the/h condition; Be 870～900 ℃ at final rolling temperature afterwards, speed is under the rolling condition of 42～102m/s, and 6～10 passages of finish rolling are 840～870 ℃ in temperature afterwards, and speed is to weave silk under the condition of 47～110m/s; Getting into afterwards in the phase Tai Ermo line air cooling equipment, is 300～650km at air quantity
3/ h, roller table speed are that completion is air-cooled under 0.25～0.45m/s condition, and collection volume and natural air cooling promptly obtain the following HPB300 gren rod reinforcing bar for building of chemical ingredients to room temperature afterwards:
C：0.10～0.16wt%，Si：0.10～0.20?wt%，Mn：0.30～0.55?wt%，
S≤0.045?wt%，?P≤0.045?wt%，
All the other are Fe and inevitable impurity.
The two cold specific waters of said step B are meant: through the ratio of two cold-zone slab qualities, be unit with L/kg in the Total Water of Secondary Cooling Zone of Continuous Caster unit time internal consumption and unit time, it is the index of continuous casting secondary cooling water spray intensity.
The present invention has advantage and effect: through such scheme, promptly in tapping process, add a small amount of alloy, lower Mn, Si content in the control steel; Controlled rolling and controlled chilling in steel rolling process; Give full play to the air-cooled crystal grain thinning effect of phase Tai Ermo line; Make material internal form crystal " defective " such as a large amount of deformation bands, twin, dislocation; Promoted a large amount of forming cores of material internal in the follow-up phase transformation, significantly refinement ferrite crystal grain, grain fineness number reaches 10.0～11.5 grades; The inventive method is not fully exerted the refined crystalline strengthening effect and has improved the plasticity and toughness of steel, characteristics such as the reinforcing bar of being produced has that cost is low, intensity is high, plasticity and toughness and shock resistance excellence; This technology has realized the low-cost industrialization production of HPB300 gren rod reinforcing bar for building, helps promoting China's high-strength reduction for building to use steel production, accelerates the construction(al)steel upgrading.
The technologic mechanics performance of HPB300 gren rod reinforcing bar for building provided by the invention is seen table 1.
Table 1 HPB300 gren rod for building reinforcement rebar craft mechanical property
Its technologic mechanics performance is following: ys (R
EL): 330～385MPa, tensile strength (R
m): 450～495MPa, elongation after fracture (A)>30.0%, (the Agt) > of percentage of total elongation under the maximum, force; 15.5%, 10.0～11.5 grades of ferrite grain sizes.
Embodiment
Below in conjunction with embodiment the present invention is done and to further describe.
Embodiment 1
A, molten steel are smelted: after molten iron, steel scrap and the pig iron are added 50 tons of LD oxygen coverters, carry out conventional top bottom blowing, carry out slag making by convention amount adding lime, rhombspar, magnesite ball; The control endpoint carbon content is 0.06wt%, and tapping temperature is 1652 ℃, presses 1.0kg/t before the tapping
SteelAmount, add refining slag to ladle bottom; Omnidistance BOTTOM ARGON BLOWING during tapping, control argon flow amount is 20NL/min, when the ladle molten steel amount greater than 1/4 the time, the following material of adding in ladle successively: press 1.0kg/t
SteelAmount, add the silico-calcium barium composite deoxidant of following mass ratio: Si 26.5wt%, Ca 12.5wt%, Ba 9.5 wt%; Press 4.3kg/t
SteelAmount, adding Mn content is that 66.5wt%, Si content are the silicomanganese of 17.5wt%; Press 1.0kg/t
SteelAmount, adding Si content is the ferrosilicon of 73.5wt%, and reaches at 3/4 o'clock in the ladle molten steel amount and add, to carry out deoxidation alloying; After tapping finishes, to molten steel Argon 4 minutes, to promote in the molten steel floating foreign and to get rid of that improve the molten steel cleanliness factor, Argon is pressed 1.0kg/t after finishing
SteelAmount, in ladle, add conventional insulating covering agent after, send continuous casting working procedure;
B, molten steel casting: at tundish temperature is 1545 ℃; Pulling rate is 2.5m/min; Two cold specific waters are 2.1L/kg, and the strand straightening temperature is under 1015 ℃ the condition, the molten steel of steps A to be delivered to continuous casting platform; On the little square billet casting machine of R8m 4 machines, 4 streams, it is the little square billet of 150mm * 150mm that continuous casting becomes section;
C, steel billet controlled rolling and controlled cooling: it is in 1150 ℃ the process furnace that the little square billet of step B is sent into the soaking zone temperature, heats 80 minutes, send conventional high-speed rod-rolling mill, is 1000 ℃ at the steel billet start rolling temperature, and speed is under the rolling condition of 0.28m/s, 6 passages of roughing; In speed is under the rolling condition of 15.1 m/s, in roll 12 passages; At cooling water inflow is 30m
3Control is cold 2 seconds under the/h condition; At final rolling temperature is 900 ℃, and speed is under the rolling condition of 102m/s, and 10 passages of finish rolling are 870 ℃ in temperature, and speed is to weave silk under the condition of 110m/s; Sending into afterwards in the conventional phase Tai Ermo line air cooling equipment, is 300km at air quantity
3/ h, roller table speed are that completion is air-cooled under the 0.45m/s condition; Collection volume and natural air cooling promptly obtain the following HPB300 gren rod reinforcing bar for building of chemical ingredients to room temperature afterwards:
C：0.10wt%，Si：0.10wt%，Mn：0.30wt%，S：0.022?wt%，P：0.031?wt%，
All the other are Fe and inevitable impurity.
The HPB300 gren rod reinforcement rebar craft mechanical property of embodiment 1 is seen table 2.
Table 2 HPB300 heat calendering coil rod reinforcement rebar craft mechanical property
Embodiment 2
A, molten steel are smelted: after molten iron, steel scrap and the pig iron are added 50 tons of LD oxygen coverters, carry out conventional top bottom blowing, carry out slag making by convention amount adding lime, rhombspar, magnesite ball; The control end point carbon is 0.07wt%, and tapping temperature is 1658 ℃, presses 1.0kg/t before the tapping
SteelAmount, add refining slag to ladle bottom; Omnidistance BOTTOM ARGON BLOWING during tapping, control argon flow amount is 20NL/min, when the ladle molten steel amount greater than 1/4 the time, the following material of adding in ladle successively: press 1.5kg/t
SteelAmount, add the silico-calcium barium composite deoxidant of following mass ratio: Si 26.5wt%, Ca 12.5wt%, Ba 9.5 wt%; Press 6.9kg/t
SteelAmount, adding Mn content is that 66.5wt%, Si content are the silicomanganese of 17.5wt%; Press 1.1kg/t
SteelAmount, adding Si content is the ferrosilicon of 73.5wt%, and reaches at 3/4 o'clock in the ladle molten steel amount and add, to carry out deoxidation alloying; After tapping finishes, to molten steel Argon 4.0 minutes, to promote in the molten steel floating foreign and to get rid of that improve the molten steel cleanliness factor, Argon is pressed 1.0kg/t after finishing
SteelAmount, in ladle, add conventional insulating covering agent after, send continuous casting working procedure;
B, molten steel casting: at tundish temperature is 1550 ℃; Pulling rate is 2.4m/min; Two cold specific waters are 1.9L/kg, and the strand straightening temperature is under 980 ℃ the condition, the molten steel of steps A to be delivered to continuous casting platform; On the little square billet casting machine of R8m 4 machines, 4 streams, it is the little square billet of 150mm * 150mm that continuous casting becomes section;
C, steel billet controlled rolling and controlled cooling: it is in 1120 ℃ the process furnace that the little square billet of step B is sent into the soaking zone temperature, heats 70 minutes, send conventional high-speed rod-rolling mill, is 970 ℃ at the steel billet start rolling temperature, and speed is under the rolling condition of 0.22m/s, 6 passages of roughing; In speed is under the rolling condition of 15.1 m/s, in roll 12 passages; At cooling water inflow is 48m
3Control is cold 3 seconds under the/h condition; At final rolling temperature is 890 ℃, and speed is under the rolling condition of 62m/s, and 7 passages of finish rolling are 850 ℃ in temperature, and speed is to weave silk under the condition of 70m/s; Sending into afterwards in the conventional phase Tai Ermo line air cooling equipment, is 430km at air quantity
3/ h, roller table speed are that completion is air-cooled under the 0.38m/s condition; Collection volume and natural air cooling promptly obtain the following HPB300 gren rod reinforcing bar for building of chemical ingredients to room temperature afterwards:
C：0.14wt%，Si：0.16wt%，Mn：0.50wt%，S：0.021?wt%，P：0.026?wt%，
All the other are Fe and inevitable impurity.
The HPB300 gren rod reinforcement rebar craft mechanical property of embodiment 2 is seen table 3.
Table 3 HPB300 heat calendering coil rod reinforcement rebar craft mechanical property
Embodiment 3
A, molten steel are smelted: after molten iron, steel scrap and the pig iron are added 50 tons of LD oxygen coverters, carry out conventional top bottom blowing, carry out slag making by convention amount adding lime, rhombspar, magnesite ball; The control end point carbon is 0.06wt%, and tapping temperature is 1658 ℃, presses 1.0kg/t before the tapping
SteelAmount, add refining slag to ladle bottom; Omnidistance BOTTOM ARGON BLOWING during tapping, control argon flow amount is 40NL/min, when the ladle molten steel amount greater than 1/4 the time, the following material of adding in ladle successively: press 1.0kg/t
SteelAmount, add the silico-calcium barium composite deoxidant of following mass ratio: Si 26.5wt%, Ca 12.5wt%, Ba 9.5 wt%; Press 8.0kg/t
SteelAmount, adding Mn content is that 66.5wt%, Si content are the silicomanganese of 17.5wt%; Press 1.2kg/t
SteelAmount, adding Si content is the ferrosilicon of 73.5wt%, and reaches at 3/4 o'clock in the ladle molten steel amount and add, to carry out deoxidation alloying; After tapping finishes, to molten steel Argon 5 minutes, to promote in the molten steel floating foreign and to get rid of that improve the molten steel cleanliness factor, Argon is pressed 1.0kg/t after finishing
SteelAmount, in ladle, add conventional insulating covering agent after, send continuous casting working procedure;
B, molten steel casting: at tundish temperature is 1535 ℃; Pulling rate is 2.6m/min; Two cold specific waters are 2.2L/kg, and the strand straightening temperature is under 1030 ℃ the condition, the molten steel of steps A to be delivered to continuous casting platform; On the little square billet casting machine of R8m 4 machines, 4 streams, it is the little square billet of 150mm * 150mm that continuous casting becomes section;
C, steel billet controlled rolling and controlled cooling: it is in 1100 ℃ the process furnace that the little square billet of step B is sent into the soaking zone temperature, heats 60 minutes, send conventional high-speed rod-rolling mill, is 950 ℃ at the steel billet start rolling temperature, and speed is under the rolling condition of 0.18m/s, 6 passages of roughing; In speed is under the rolling condition of 10.5 m/s, in roll 12 passages; At cooling water inflow is 60m
3Control is cold 3 seconds under the/h condition; At final rolling temperature is 870 ℃, and speed is under the rolling condition of 42m/s, and 6 passages of finish rolling are 840 ℃ in temperature, and speed is to weave silk under the condition of 47m/s; Sending into afterwards in the conventional phase Tai Ermo line air cooling equipment, is 650km at air quantity
3/ h, roller table speed are that completion is air-cooled under the 0.25 m/s condition; Collection volume and natural air cooling promptly obtain the following HPB300 gren rod reinforcing bar for building of chemical ingredients to room temperature afterwards:
C：0.16wt%，Si：0.20wt%，Mn：0.55wt%，S：0.018?wt%，P：0.024?wt%，
All the other are Fe and inevitable impurity.
The HPB300 gren rod reinforcement rebar craft mechanical property of embodiment 3 is seen table 4.
Table 4 HPB300 heat calendering coil rod reinforcement rebar craft mechanical property
Claims (1)
1. the preparation method of a HPB300 gren rod reinforcing bar for building is characterized in that through following process steps:
A, molten steel are smelted: after molten iron, steel scrap and the pig iron are added the LD oxygen coverter, carry out conventional top bottom blowing, carry out slag making by convention amount adding lime, rhombspar, magnesite ball; Control end point carbon>=0.06wt%, tapping temperature is pressed 1.0kg/t less than 1660 ℃ before the tapping
SteelAmount, add refining slag to ladle bottom; Omnidistance BOTTOM ARGON BLOWING during tapping, control argon flow amount is 20～40NL/min, when the ladle molten steel amount greater than 1/4 the time, in ladle, add following material successively: press 1.0～1.5kg/t
SteelAmount, add the silico-calcium barium composite deoxidant of following mass ratio: Si 26.5wt%, Ca 12.5wt%, Ba 9.5 wt%; By 4.3～8.0kg/t
SteelAmount, adding Mn content is that 66.5wt%, Si content are the silicomanganese of 17.5wt%; By 1.0～1.2kg/t
SteelAmount, adding Si content is the ferrosilicon of 73.5wt%, and reaches at 3/4 o'clock in the ladle molten steel amount and add, to carry out deoxidation alloying; After tapping finishes, to molten steel Argon 4～5 minutes, to promote in the molten steel floating foreign and to get rid of that improve the molten steel cleanliness factor, Argon is pressed 1.0kg/t after finishing
SteelAmount, in ladle, add conventional insulating covering agent after, send continuous casting working procedure;
B, molten steel casting: at tundish temperature is 1535～1550 ℃, and pulling rate is 2.4～2.6m/min, and two cold specific waters are 1.9～2.2L/kg, under the condition that the strand straightening temperature is 980～1030 ℃, the continuous casting of molten steel of steps A is become steel billet;
C, steel billet controlled rolling and controlled cooling: it is in 1100～1150 ℃ the process furnace that the steel billet of step B is sent into the soaking zone temperature; Heated 60～80 minutes; The employing high-speed rod-rolling mill is rolled; At the steel billet start rolling temperature is 950～1000 ℃, and speed is under the rolling condition of 0.18～0.28m/s, 6 passages of roughing; In speed is under the rolling condition of 10.5～15.1 m/s, in roll 12 passages; At cooling water inflow is 30～60m
3Control is cold 2～3 seconds under the/h condition; At final rolling temperature is 870～900 ℃, and speed is under the rolling condition of 42～102m/s, and 6～10 passages of finish rolling are 840～870 ℃ in temperature, and speed is to weave silk under the condition of 47～110m/s; Getting into afterwards in the phase Tai Ermo line air cooling equipment, is 300～650km at air quantity
3/ h, roller table speed are that completion is air-cooled under 0.25～0.45m/s condition, and collection volume and natural air cooling promptly obtain the following HPB300 gren rod reinforcing bar for building of chemical ingredients to room temperature afterwards:
C：0.10～0.16wt%，Si：0.10～0.20?wt%，Mn：0.30～0.55?wt%，
S≤0.045?wt%，?P≤0.045?wt%，
All the other are Fe and inevitable impurity.
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Cited By (9)
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| CN103981448A (en) * | 2014-05-30 | 2014-08-13 | 武钢集团昆明钢铁股份有限公司 | Ultra-fine grained HPB300 hot-rolling optical disc stripe reinforcing steel bar and preparation method thereof |
| CN104056862A (en) * | 2014-07-07 | 2014-09-24 | 首钢总公司 | Control method for reducing specified non-proportional extension strength fluctuation |
| CN105714195A (en) * | 2016-03-08 | 2016-06-29 | 邢台钢铁有限责任公司 | Atmospheric-corrosion-resistant cold heading steel hot rolled wire rod and production method thereof |
| CN110699595A (en) * | 2019-11-20 | 2020-01-17 | 曲靖促创科技有限公司 | Hot rolling process for reinforcing steel bar |
| CN111779276A (en) * | 2020-07-16 | 2020-10-16 | 广东珠江建筑工程设计有限公司 | Large-span beam construction method based on hot-rolled high-strength steel bars |
| CN112742863A (en) * | 2020-12-04 | 2021-05-04 | 安阳复星合力新材料股份有限公司 | Production method of cold-rolled steel bar |
| CN114318141A (en) * | 2021-12-14 | 2022-04-12 | 石横特钢集团有限公司 | Production process of high-performance smooth steel bar |
| CN115198195A (en) * | 2022-08-02 | 2022-10-18 | 武钢集团昆明钢铁股份有限公司 | High-toughness steel wire rod for welded mesh and preparation method thereof |
| CN115305408A (en) * | 2022-08-02 | 2022-11-08 | 武钢集团昆明钢铁股份有限公司 | High-toughness steel 10B28 wire rod with nominal diameter of 16-20 mm for cold heading and cold extrusion and preparation method thereof |
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| CN103981448A (en) * | 2014-05-30 | 2014-08-13 | 武钢集团昆明钢铁股份有限公司 | Ultra-fine grained HPB300 hot-rolling optical disc stripe reinforcing steel bar and preparation method thereof |
| CN103981448B (en) * | 2014-05-30 | 2016-05-25 | 武钢集团昆明钢铁股份有限公司 | A kind of Ultra-fine Grained HPB300 hot calendering coil rod reinforcing bar and preparation method thereof |
| CN104056862A (en) * | 2014-07-07 | 2014-09-24 | 首钢总公司 | Control method for reducing specified non-proportional extension strength fluctuation |
| CN105714195A (en) * | 2016-03-08 | 2016-06-29 | 邢台钢铁有限责任公司 | Atmospheric-corrosion-resistant cold heading steel hot rolled wire rod and production method thereof |
| CN110699595A (en) * | 2019-11-20 | 2020-01-17 | 曲靖促创科技有限公司 | Hot rolling process for reinforcing steel bar |
| CN111779276A (en) * | 2020-07-16 | 2020-10-16 | 广东珠江建筑工程设计有限公司 | Large-span beam construction method based on hot-rolled high-strength steel bars |
| CN112742863A (en) * | 2020-12-04 | 2021-05-04 | 安阳复星合力新材料股份有限公司 | Production method of cold-rolled steel bar |
| CN112742863B (en) * | 2020-12-04 | 2023-06-09 | 安阳复星合力新材料股份有限公司 | Cold-rolled steel bar production method |
| CN114318141A (en) * | 2021-12-14 | 2022-04-12 | 石横特钢集团有限公司 | Production process of high-performance smooth steel bar |
| CN115198195A (en) * | 2022-08-02 | 2022-10-18 | 武钢集团昆明钢铁股份有限公司 | High-toughness steel wire rod for welded mesh and preparation method thereof |
| CN115305408A (en) * | 2022-08-02 | 2022-11-08 | 武钢集团昆明钢铁股份有限公司 | High-toughness steel 10B28 wire rod with nominal diameter of 16-20 mm for cold heading and cold extrusion and preparation method thereof |
| CN115198195B (en) * | 2022-08-02 | 2023-03-07 | 武钢集团昆明钢铁股份有限公司 | High-toughness steel wire rod for welded mesh and preparation method thereof |
| CN115305408B (en) * | 2022-08-02 | 2023-09-22 | 武钢集团昆明钢铁股份有限公司 | High-toughness cold heading and cold extrusion steel 10B28 wire rod with nominal diameter of 16-20 mm and preparation method thereof |
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| CN102796945B (en) | 2014-06-25 |
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