CN108676965A - A kind of production method of high building structure hot rolled circular steel - Google Patents
A kind of production method of high building structure hot rolled circular steel Download PDFInfo
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- CN108676965A CN108676965A CN201810495863.9A CN201810495863A CN108676965A CN 108676965 A CN108676965 A CN 108676965A CN 201810495863 A CN201810495863 A CN 201810495863A CN 108676965 A CN108676965 A CN 108676965A
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- 229910000831 Steel Inorganic materials 0.000 title claims description 62
- 239000010959 steel Substances 0.000 title claims description 62
- 238000004519 manufacturing process Methods 0.000 title claims description 16
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 22
- 238000005096 rolling process Methods 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 17
- 238000007664 blowing Methods 0.000 claims description 16
- 229910052786 argon Inorganic materials 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 11
- 238000009749 continuous casting Methods 0.000 claims description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 7
- 238000003723 Smelting Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 238000009933 burial Methods 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims 1
- 239000011572 manganese Substances 0.000 description 9
- 238000003466 welding Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910052748 manganese Inorganic materials 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/04—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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A kind of production method of high building structure hot rolled circular steel, the composition weight percent of steel is C=0.12% ~ 0.18%, Si=0.25%~0.50%, Mn=1.20%~1.70%, P≤0.025%, S≤0.015%, Al >=0.020%, carbon equivalent 0.41 ~ 0.45%, remaining is Fe and inevitable impurity；Critical process step includes：Smelting, LF stoves, VD stoves, continuous casting, heating, rolling, cooling.Its tensile strength of the steel of production is in 470 ~ 630Mpa, and yield strength is in 315 ~ 455 Mpa, and yield tensile ratio is 0.80 hereinafter, elongation percentage is 22% or more, and weld crack sensitivity coefficient is 0.28% hereinafter, subzero 20 DEG C of impacts Akv is in 47J or more.The high building structure has high intensity, good yield tensile ratio, extension property, low temperature impact properties, welding performance, anti-seismic performance etc. with hot rolled circular steel, can be good at the use demand for meeting the performances such as antidetonation, fire resisting, the welding of various high building structure hot rolled circular steels.
Description
Technical field
The invention belongs to metallurgical technology fields, are related to a kind of production of high building structure hot rolled circular steel (Q345GJC)
Method.
Technical background
With the continuous refreshing of the progress especially building height of Building technology, the requirement to construction material further carries
Height will also have good to high building structure hot rolled circular steel other than requiring the performances such as good antidetonation, fire resisting
Welding performance will include also low-temperature impact toughness with high impact toughness while with high intensity, preferable elongation percentage.
Exploitation has high building structure steel plate Q345GJC in the world at present, but there has been no high building structure circles
The report of steel.There are the mass production of the following smooth surface disk reinforcing bar of 25mm specifications, the HPB300 that yield strength is 300Mpa grades in China；
There is the exploitation of high building structure steel plate Q345GJC, but it is the height of the intensity rank of 345Mpa not have mating yield strength
Layer round steel exploitation for building.High building structure is with hot rolled circular steel increasingly to high intensity, high-elongation, high impact toughness, antidetonation
Direction is developed.Therefore the market demand that our iron and steel enterprises will develop according to domestic high building structure, research and development skyscraper are used
Round steel reaches world-class levels.
Invention content
The present invention is intended to provide a kind of production method of high building structure hot rolled circular steel, represents steel grade Q345GJC
Maximum specification is 150mm, minimum gauge 30mm, hot rolling tensile strength in 470 ~ 630MPa, yield strength 310~
445MPa, for elongation percentage 22% or more, zero degree impacts AKV in 34J or more, can be good at meeting various high building structure steel
Use demand.
The technical solution of invention：
The production method of high building structure hot rolled circular steel, the chemical composition weight percent of steel be C=0.12 ~ 0.18, Si=
0.25~0.50, Mn=1.20~1.70, P≤0.025, S≤0.015, Al >=0.020, carbon equivalent=0.41 ~ 0.45, remaining is
Fe and inevitable impurity.Critical process step includes：
Converter smelting：Terminal point control C >=0.05%, P≤0.020%, height draw after-blow number ≯ 2 time of re-blowing；Tap 1/4 when toward ladle
Middle addition alloy, using slag-stopping tapping；
LF stoves are smelted：Molten steel in LF stove conduction times >=20min, make white slag deoxidation and go to press from both sides by the min of total argon blowing time >=40, refining
It is miscellaneous；150 ~ 300 meters/stove of Ca lines is fed before molten steel is outbound；
VD stoves are smelted：In the total argon blowing time >=40min of VD stoves；0.5tor is vacuumized hereinafter, protecting vacuum time >=15min, breaks sky
Soft argon blowing time >=15min afterwards；Molten steel is outbound often to be poured and time determine hydrogen and is no less than 1 stove, is according to target worth [H]≤2.0ppm and is controlled；Molten steel
Outbound upper continuous casting platform temperature even pours stove≤35 DEG C by middle packet degree of superheat desired value, opens and pours stove≤40 DEG C control；Middle Baogang's water overheat
Degree, which is opened, pours stove≤40 DEG C, and stove≤35 DEG C are poured by company；Middle packet allusion quotation is pulled through 20-30 DEG C of temperature；
Continuous casting：It is cast using whole process protection, 15 DEG C~25 DEG C of middle packet degree of superheat desired value；
Heating：Between 1180~1220 DEG C of slab heating temperature, soaking time 90min ~ 240min；
Rolling：55 ~ 150mm specification sticks two wires：Using two-phase control rolling, first stage split rolling method, using suitable small pressure
Passage is measured, second stage Continuous mill train shuts out finished product, 980~1020 DEG C of finishing temperature；
It is cooling：Directly cold bed cooling after rolling enters burial pit heat preservation not less than for 24 hours when cooling temperature is to 400~500 DEG C；20~55mm
One line of specification stick：Roughing is rolled using 6 frame plain-barreled roll units, is subsequently rolled using the Continuous mill train of most 12 sorties according to different size
Finished product round steel is made；1020 ~ 1080 DEG C of finishing temperature；Go out after finish to gauge unit after entering nibbling shear, enters cold bed later and cool down.
In the continuous casting process, strand size includes 150 mm × 150mm × 12m, the mm × 6 of 240 mm × 240 m, 300
mm×430 mm×6m。
In the heating process, soaking time is：150mm × 150mm square billet heating times >=90min, 240mm ×
240mm square billet heating times >=120min, 300mm × 430mm square billet heating times >=240min.
Inventive principle：
The present invention is by using low-carbon high-manganese composition design, LF refining, the vacuum outgas of VD stoves, a series of smeltings such as roll rear slow cooling and
New technology is rolled, the high intensity of ferrite+pearlitic structrure, good extension property, good yield tensile ratio and low are successfully developed
Warm impact property, welding performance, representing steel grade, it represents steel grade Q345GJC hot rollings tensile strength in 470 ~ 630MPa, surrender
Intensity is in 310 ~ 445MPa, and for the contraction percentage of area 22% or more, zero degree impacts AKV in 34J or more, can be good at meeting various
The use demand of high building structure steel.
Design of Chemical Composition of the present invention to its intensity and extension property, low temperature impact properties, welding performance, anti-seismic performance,
The emphasis such as strong flexor ratio performance consider that organization design is then ferrite+pearlitic structrure.
Using the composition design of low-carbon high-manganese.Although the raising of C content can improve intensity and reduce Ar3 temperature, dislike
Change the extension property of steel, therefore final carbon content control is 0.24 ~ 0.27%；Manganese is weak carbide formation element, it can be reduced
Austenite transformation temperature, fining ferrite grains, beneficial to improving armor plate strength and toughness, therefore, in composition design, manganese is set
Lower limit 1.45% is counted, but when content is more than 1.70%, center segregation aggravates, and extension property is caused to reduce.
In order to ensure high intensity, high tenacity, molten steel must have higher degree of purity.P, S is objectionable impurities elements, is passed through
When controlling converter tapping [P]≤0.020%, and by LF refining technique, the white slag retention time >=15min, make end phosphorus content≤
0.025%, sulfur content≤0.015%, and reduce other impurities in molten steel.
The present invention improves the obdurability and low temperature impact properties, welding performance, anti-seismic performance of round steel in composition design,
Again by cooling rate appropriate and burial pit slow cooling, to ensure its toughness while increasing round steel intensity.
Should have low-carbon-equivalent and low Pcm while meeting high intensity and excellent toughness using the composition design of low-carbon high-manganese
Value.
Beneficial effects of the present invention：From wound low-carbon high-manganese, LF refining technology, VD stove vacuum outgas, P, S content are strictly controlled
With the degree of purity of molten steel, the high building structure hot rolled circular steel Q345GJC of ferrite+pearlitic structrure is successfully developed；Profit
With steel mill's existing equipment and process conditions, neither increase investment and production cost, and improve production efficiency, energy-saving consumption-reducing；Production
Product are organized as ferrite+pearlitic structrure, have high intensity, good yield tensile ratio, extension property, low temperature impact properties, welding
Performance, anti-seismic performance etc. can be good at meeting the property such as antidetonation, fire resisting, the welding of various high building structure hot rolled circular steels
The use demand of energy.
Description of the drawings
Attached drawing 1 is the metallographic structure figure of the representative steel grade Q345GJC of the embodiment of the present invention.
Specific implementation mode
Present disclosure is described further with reference to embodiment：
Embodiment 1
A kind of production method of high building structure hot rolled circular steel, the composition weight percent of steel are：C=0.16, Si=0.37,
Mn=1.52, P=0.015, S=0.002, Al=0.029, CEV=0.43, remaining is Fe and inevitable impurity.Critical process
Step includes：
Converter smelting：Terminal C：0.08%, P：0.013%；Height draws the after-blow number 1 time of re-blowing；Tap 1/4 when be added into ladle
Alloy；
LF stoves：Molten steel is in LF stove conduction time 28min, 52 min of total argon blowing time；180 meters of Ca lines are fed before molten steel is outbound.
VD stoves：In the total argon blowing time of VD stoves 50 minutes；Vacuum time 15min is protected, soft argon blowing time 18min after sky is broken；It is fixed
[H] 1.2ppm；
Continuous casting：20 DEG C~21 DEG C, pulling rate 0.65m/min of the degree of superheat, strand size： 300*340*mm*6m；
Heating：Between 1180~1200 DEG C of slab heating temperature, time inside furnace 270min；
Rolling：Using two-phase control rolling, the first rank split rolling method, second stage Continuous mill train shuts out finished product, finishing temperature control
At 1010 DEG C；
It is cooling：Directly cold bed cooling after rolling enters burial pit heat preservation, soaking time when until cooling temperature is between 400~500 DEG C
27h。
Round steel mechanical property is shown in Table 1.
Embodiment 2
A kind of production method of high building structure hot rolled circular steel, the composition weight percent of steel are C=0.17, Si=0.37,
Mn=1.55, P=0.021, S=0.002, Al=0.029, CEV=0.44, remaining is Fe and inevitable impurity；Critical process
Step includes：
Converter smelting：Terminal C：0.10%, P：0.017%；Height draws the after-blow number 1 time of re-blowing, and when tapping 1/4 is added into ladle
Alloy；
LF stoves：Molten steel is in LF stoves conduction time 28min, total argon blowing time 68min；200 meters of Ca lines are fed before molten steel is outbound.
Continuous casting：30 DEG C~33 DEG C, 0.70 ~ 080m/min of pulling rate of the degree of superheat, strand size：240*240*mm*6m；
Heating：Between 1180~1200 DEG C of slab heating temperature, time inside furnace 150min；
Rolling：Using two-phase control rolling, the first rank split rolling method, second stage Continuous mill train shuts out finished product, finishing temperature control
At 1020 DEG C；
It is cooling：Directly cold bed cooling after rolling enters burial pit heat preservation, soaking time when until cooling temperature is between 400~500 DEG C
28h。
Round steel mechanical property is shown in Table 1.
Example 3：
A kind of production method of high building structure hot rolled circular steel, the composition weight percent of steel are C=0.17, Si=0.40,
Mn=1.49, P=0.019, S=0.004, Al=0.032, CEV=0.43, remaining is Fe and inevitable impurity；Critical process
Step includes：
Converter smelting：Terminal C：0.09%, P：0.017%；Height draws the after-blow number 1 time of re-blowing, and when tapping 1/4 is added into ladle
Alloy；
LF stoves：Molten steel is in LF stoves conduction time 22min, total argon blowing time 47min；200 meters of Ca lines are fed before molten steel is outbound.
Continuous casting：27 DEG C~31 DEG C, 1.60 ~ 1.70m/min of pulling rate of the degree of superheat, strand size：150*150*mm*12m；
Heating：Between 1020~1100 DEG C of slab heating temperature, time inside furnace 120min；
Rolling：1010 DEG C of open rollings are rolled, in thick after Continuous mill train, and finishing temperature control is at 1040 DEG C；
It is cooling：Directly cold bed cooling after rolling, until cooling temperature is sheared to fixed size scissors at 300~400 DEG C, bundling after the completion of shearing
Packaging and storage, the natural cooling in storehouse.
Round steel mechanical property is shown in Table 1.
The mechanical property of round steel in 1 embodiment of table
From 1 test result of table as it can be seen that method using the present invention production high building structure hot rolled circular steel, when specification is
When 100mm, 80mm, 40mm, yield strength is respectively 381Mpa, 364 Mpa, 372 Mpa, tensile strength be respectively 576Mpa,
549Mpa, 588 Mpa, it is respectively 32.5%, 30.5%, 33.5% to extend, and yield tensile ratio is respectively 0.66,0.66,0.63, subzero 20
DEG C impact Akv in 86 ~ 123J；Weld crack sensitivity coefficient is 25.5,26.8,26.3；The high building structure hot rolled circular steel
With high intensity, good yield tensile ratio, extension property, low temperature impact properties, welding performance, anti-seismic performance etc., can be good at
Meet the use demand of the performances such as antidetonation, fire resisting, the welding of various high building structure hot rolled circular steels.
Claims (3)
1. the production method of high building structure hot rolled circular steel, it is characterised in that：The chemical composition weight percent of steel be C=
0.12 ~ 0.18, Si=0.25~0.50, Mn=1.20~1.70, P≤0.025, S≤0.015, Al >=0.020, carbon equivalent=0.41
~ 0.45, remaining is Fe and inevitable impurity；Critical process step includes：
Converter smelting：Terminal point control C >=0.05%, P≤0.020%, height draw after-blow number ≯ 2 time of re-blowing；Tap 1/4 when toward ladle
Middle addition alloy, using slag-stopping tapping；
LF stoves are smelted：Molten steel in LF stove conduction times >=20min, make white slag deoxidation and go to press from both sides by the min of total argon blowing time >=40, refining
It is miscellaneous；150 ~ 300 meters/stove of Ca lines is fed before molten steel is outbound；
VD stoves are smelted：In the total argon blowing time >=40min of VD stoves；0.5tor is vacuumized hereinafter, protecting vacuum time >=15min, breaks sky
Soft argon blowing time >=15min afterwards；Molten steel is outbound often to be poured and time determine hydrogen and is no less than 1 stove, is according to target worth [H]≤2.0ppm and is controlled；Molten steel
Outbound upper continuous casting platform temperature even pours stove≤35 DEG C by middle packet degree of superheat desired value, opens and pours stove≤40 DEG C control；Middle Baogang's water overheat
Degree, which is opened, pours stove≤40 DEG C, and stove≤35 DEG C are poured by company；Middle packet allusion quotation is pulled through 20-30 DEG C of temperature；
Continuous casting：It is cast using whole process protection, 15 DEG C~25 DEG C of middle packet degree of superheat desired value；
Heating：Between 1180~1220 DEG C of slab heating temperature, soaking time 90min ~ 240min；
Rolling：55 ~ 150mm specification sticks two wires：Using two-phase control rolling, first stage split rolling method, using suitable small pressure
Passage is measured, second stage Continuous mill train shuts out finished product, 980~1020 DEG C of finishing temperature；
It is cooling：Directly cold bed cooling after rolling enters burial pit heat preservation not less than for 24 hours when cooling temperature is to 400~500 DEG C；20~55mm
One line of specification stick：Roughing is rolled using 6 frame plain-barreled roll units, is subsequently rolled using the Continuous mill train of most 12 sorties according to different size
Finished product round steel is made；1020 ~ 1080 DEG C of finishing temperature；Go out after finish to gauge unit after entering nibbling shear, enters cold bed later and cool down.
2. the production method of high building structure hot rolled circular steel according to claim 1, it is characterised in that：The company
In casting process, strand size include 150 mm × 150mm × 12m, the mm × 6 of 240 mm × 240 m, the mm of 300 mm × 430 ×
6m。
3. the production method of high building structure hot rolled circular steel according to claim 1, it is characterised in that：Described adds
In thermal process, square billet soaking time is：150mm × 150mm square billet heating times >=90min, the heating of 240mm × 240mm square billets
Time >=120min, 300mm × 430mm square billet heating times >=240min.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109988973A (en) * | 2019-05-22 | 2019-07-09 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of axle head hot rolled circular steel |
| CN110129657A (en) * | 2019-05-22 | 2019-08-16 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of track pin hot rolled circular steel |
| CN110760643A (en) * | 2019-11-29 | 2020-02-07 | 新疆八一钢铁股份有限公司 | RH smelting method of high-construction steel Q390GJEZ15 steel grade |
| CN112662943A (en) * | 2020-11-30 | 2021-04-16 | 山东钢铁股份有限公司 | Low-alloy high-strength hot-rolled round steel Q460D and preparation method thereof |
| CN112792127A (en) * | 2020-12-18 | 2021-05-14 | 江苏永钢集团有限公司 | Production process of CB890QL hot-rolled round steel for crawler crane boom |
| CN114921712A (en) * | 2022-05-30 | 2022-08-19 | 湖南华菱湘潭钢铁有限公司 | Production method of steel for high-pressure oil pipe joint |
| CN114918621A (en) * | 2022-05-30 | 2022-08-19 | 湖南华菱湘潭钢铁有限公司 | Production method of round steel for straightening-free boiler hanger rod |
| CN115323282A (en) * | 2022-07-06 | 2022-11-11 | 包头钢铁（集团）有限责任公司 | Q345GJC/D hot-rolled H-shaped steel for high-grade building structure and production method thereof |
Citations (3)
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| CN109988973A (en) * | 2019-05-22 | 2019-07-09 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of axle head hot rolled circular steel |
| CN110129657A (en) * | 2019-05-22 | 2019-08-16 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of track pin hot rolled circular steel |
| CN110760643A (en) * | 2019-11-29 | 2020-02-07 | 新疆八一钢铁股份有限公司 | RH smelting method of high-construction steel Q390GJEZ15 steel grade |
| CN112662943A (en) * | 2020-11-30 | 2021-04-16 | 山东钢铁股份有限公司 | Low-alloy high-strength hot-rolled round steel Q460D and preparation method thereof |
| CN112792127A (en) * | 2020-12-18 | 2021-05-14 | 江苏永钢集团有限公司 | Production process of CB890QL hot-rolled round steel for crawler crane boom |
| CN112792127B (en) * | 2020-12-18 | 2022-07-05 | 江苏永钢集团有限公司 | Production process of CB890QL hot-rolled round steel for crawler crane boom |
| CN114921712A (en) * | 2022-05-30 | 2022-08-19 | 湖南华菱湘潭钢铁有限公司 | Production method of steel for high-pressure oil pipe joint |
| CN114918621A (en) * | 2022-05-30 | 2022-08-19 | 湖南华菱湘潭钢铁有限公司 | Production method of round steel for straightening-free boiler hanger rod |
| CN115323282A (en) * | 2022-07-06 | 2022-11-11 | 包头钢铁（集团）有限责任公司 | Q345GJC/D hot-rolled H-shaped steel for high-grade building structure and production method thereof |
| CN115323282B (en) * | 2022-07-06 | 2024-06-11 | 包头钢铁（集团）有限责任公司 | Q345GJC/D hot rolled H-shaped steel for high-grade building structure and production method thereof |
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