CN106119689A - A kind of big specification Q420C hot rolling equal angle steel and production method thereof - Google Patents
A kind of big specification Q420C hot rolling equal angle steel and production method thereof Download PDFInfo
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- CN106119689A CN106119689A CN201610618423.9A CN201610618423A CN106119689A CN 106119689 A CN106119689 A CN 106119689A CN 201610618423 A CN201610618423 A CN 201610618423A CN 106119689 A CN106119689 A CN 106119689A
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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Abstract
The invention discloses a kind of big specification Q420C hot rolling equal angle steel and production method thereof, belong to metallurgical technology field.Described angle steel chemical composition and mass fraction are as follows: C:0.15 0.18%, Mn:1.35 1.55%, Si:0.25 0.50%, S≤0.020%, P≤0.025%, V:0.055 0.075%, Als >=0.015%, CEV≤0.44%, and surplus is ferrum and inevitable impurity.Production method concrete steps include converter smelting, LF external refining, continuous casting, and continuous casting billet heats, rolling, aligning, and described converter smelting operation uses V N micro-alloying technology, adds VN alloy VN16, and the mass fraction controlling V is 0.060 0.070%.The 18# 25# big specification Q420C hot rolling equal angle steel Design of Chemical Composition that the present invention produces is reasonable, and mechanical property and impact property preferably meet the requirement of national standard.
Description
Technical field
The invention belongs to metallurgical technology field, be specifically related to a kind of big specification Q420C hot rolling equal angle steel and producer thereof
Method.
Background technology
The hot-rolled angle steel that He Gang Tang Gang produces is mainly for the manufacture of Transmission Towers.The electric power tower use that China is currently used
Angle steel intensity and credit rating are relatively low, and B level is more, and the northern area of China winter climate is cold, some area winters minimum gas
Close-40 DEG C. the electric power tower in these areas has the long period to work at low temperatures.In recent years, cold district electric power tower is built
If carrying out on a large scale, tower angle steel low temperature all the year round is on active service.Low temperature makes the fragility of angle steel weld seam increase further, brittle fracture
Tendency strengthens, and directly affects the safety of steel tower.Therefore the low-temperature flexibility problem of angle steel increasingly receives publicity.
He Gang Tang Gang large-scale production line was gone into operation in March, 2012, groped through the production more than 2 years, had possessed batch production
The experience of Q345B, Q420B angle steel, produces 3.52 ten thousand tons of big specification 18#-25#Q345B, Q420B angle steel, angle steel matter for 2014 altogether
Amount is stable, lays a good foundation for exploitation big specification low temperature resistant Q420C angle steel.
Summary of the invention
The invention provides a kind of big specification Q420C hot rolling equal angle steel and production method thereof, for the defeated change of extremely cold area
The construction of electricity steel tower corner iron.
One of the object of the invention is to provide a kind of big specification Q420C hot rolling equal angle steel, described angle steel chemical composition and matter
Amount mark is as follows: C:0.15-0.18%, Mn:1.35-1.55%, Si:0.25-0.50%, S≤0.020%, P≤0.025%, V:
0.055-0.075%, Als >=0.015%, CEV≤0.44%, surplus is ferrum and inevitable impurity.
Angle steel chemical composition of the present invention and mass fraction are as follows: C:0.15-0.18%, Mn:1.37-1.42%, Si:
0.28-0.32%, S≤0.020%, P≤0.025%, V:0.060-0.070%, Als >=0.019%, CEV≤0.44%, surplus is ferrum
With inevitable impurity.
Angle steel specification of the present invention is 18#-25#.
Another object of the present invention is to provide the production method of a kind of above-mentioned big specification Q420C hot rolling equal angle steel, tool
Body step includes: converter smelting, LF external refining, continuous casting, and continuous casting billet heats, rolling, aligning, and described converter smelting operation is adopted
Using V-N micro-alloying technology, add VN alloy VN16, the mass fraction controlling V is 0.060-0.070%.
Converter smelting operation of the present invention, the mass fraction controlling converter tapping ladle sample C is 0.10-0.15%, uses silicon
Manganese alloy carries out manganese, alloying with silicon, and the mass fraction controlling Mn is 1.30-1.35%；Mass fraction≤0.020% of P, Als's
Mass fraction is 0.020-0.035%.
LF external refining operation of the present invention, the mass fraction controlling C is 0.15-0.18%, Mn:1.38-1.50%,
Si:0.28-0.35%, S≤0.020%, P≤0.025%, V:0.060-0.070%, Als:0.020-0.030%, CEV≤0.44%.
LF external refining operation of the present invention, the first bag Ca/Als >=0.11, even water heat Ca/Als:0.06-0.10.
Continuous casting working procedure of the present invention, uses rectangular bloom angle steel mould flux, and mould flux chemical composition is SiO2:
31.13%, CaO:29.25%, MgO:0.64%, Fe2O3: 0.58%, Al2O3: 4.99%, Na2O:9.74%, F:2.02%, C:
13.93%；Use the special coverture of low-alloy；Ladle uses protection sleeve pipe+sealing ring+argon envelope protective casting；Described continuous casting work
Sequence, uses M-EMS technology, electric current 520A, frequency 2.5Hz.
Continuous casting billet heating process of the present invention, heating-up temperature 1150-1250 DEG C.
Rolling process of the present invention, controls start rolling temperature 1000-1050 DEG C, finishing temperature 790-850 DEG C；Described aligning
Operation, angle steel maximum aligning drafts≤5 millimeter, aligning speed is 1.0-1.2m/s.
Hot rolling equal angle steel specification of the present invention is with reference to standard GB/T/T 706.
What employing technique scheme produced has the beneficial effects that: the 18#-25# big specification Q420C hot rolling that the present invention produces
Equal leg angle Design of Chemical Composition is reasonable, and mechanical property and impact property preferably meet wanting of standard GB/T/T 1591
Ask.The Q420C hot-rolled angle steel that existing technique produces, product quality grade meets D level requirement, even up to E level requirement.The present invention
Production technology is simple, stability of the production process is high.
Accompanying drawing explanation
Fig. 1 is 220 × 24mmQ420C equal leg angle ballistic work temperature profile in embodiment 3.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further detailed explanation.
Embodiment 1
The production method of this big specification Q420C hot-rolled angle steel (chemical composition is shown in Table 1, and performance is shown in Table 2) uses following processing step,
Wherein composition proportion is mass fraction.
Bessemerize terminal: C:0.07%, Mn:0.08%, P:0.012%；Tapping temperature 1658 DEG C.Converter tapping adds silicon
Manganese alloy (Mn:68%, Si:18%) 19.2kg/ ton steel, VN alloy VN16(V:78%) 0.88kg/ ton steel.Deoxidizer steel shot aluminum
(Al:78-82%) 1.2kg/ ton steel.After tapping, ladle temperature is: 1600 DEG C；Chemical composition: C:0.14%, Mn:1.32%, S:
0.020%, P:0.015%, Si:0.29%, V:0.065%, Als:0.030%.
The LF refine addition slag charge such as Calx, fluorite that enters the station carries out strong mixing slag, uses carborundum deoxidizer to take off oxygen in slag,
Use heated by electrodes to carry out temperature-compensating, after deoxidation, desulfurization are qualified, use aluminum steel to assort aluminum in steel, use mid-carbon fe-mn to join foot
Manganese.Carrying out Ca process after molten steel composition, temperature are qualified, after Ca/Als is qualified, molten steel carries out soft blow.Departures ladle temperature is:
1610℃；Chemical composition: C:0.17%, Mn:1.42%, S:0.006%, P:0.015%, Si:0.29%, V:0.065%, Als:
0.030%, Ca:0.0035%.
Continuous casting working procedure: big bag uses argon envelope protection sleeve pipe, uses monoblock type tundish to carry out molding casting, Cross Section of CC Billet
250×360mm；In casting process, continuous casting first is unwrapped and is watered the initial stage pouring basket liquid level addition special coverture of low-alloy, with black slag
Face operation is as the criterion, to reduce the secondary oxidation of molten steel；Casting process carries out Metal in Tundish thermometric once every 10min, in
Between Baogang's coolant-temperature gage be 1553 DEG C, 1556 DEG C, 1558 DEG C, 1555 DEG C, 1554 DEG C.Use rectangular bloom angle steel mould flux, make
With the special coverture of low-alloy；Ladle uses protection sleeve pipe+sealing ring+argon envelope protective casting；Mould flux chemical composition
For SiO2: 31.13%, CaO:29.25%, MgO:0.64%, Fe2O3: 0.58%, Al2O3: 4.99%, Na2O:9.74%, F:2.02%,
C:13.93%.Use M-EMS technology, electric current 520A, frequency 2.5Hz.
Continuous casting billet heats: heating-up temperature 1230 DEG C；Rolling: start rolling temperature 1040 DEG C, finishing temperature 845 DEG C；Rolling 180 ×
16mm equal leg angle, aligning: aligning speed 1.2m/s, maximum aligning drafts 4 millimeters.
Embodiment 2
The production method of this big specification Q420C hot-rolled angle steel (chemical composition is shown in Table 1, and performance is shown in Table 2) uses following processing step,
Wherein composition proportion is mass fraction.
Bessemerize terminal: C:0.08%, Mn:0.08%, P:0.010%；Tapping temperature 1632 DEG C.Converter tapping adds silicon
Manganese alloy (Mn:68%, Si:18%) 19.7kg/ ton steel, VN alloy VN16(V:78%) 0.90kg/ ton steel.Deoxidizer steel shot aluminum
(Al:78-82%) 1.2kg/ ton steel.
After tapping, ladle temperature is: 1570 DEG C；Chemical composition: C:0.14%, Mn:1.35%, S:0.020%, P0.012%,
Si:0.30%, V:0.067%, Als:0.031%.
The LF refine addition slag charge such as Calx, fluorite that enters the station carries out strong mixing slag, uses carborundum deoxidizer to take off oxygen in slag,
Use heated by electrodes to carry out temperature-compensating, after deoxidation, desulfurization are qualified, use aluminum steel to assort aluminum in steel, use mid-carbon fe-mn to join foot
Manganese.Carrying out Ca process after molten steel composition, temperature are qualified, after Ca/Als is qualified, molten steel carries out soft blow.
Departures ladle temperature is: 1595 DEG C；Chemical composition: C:0.16%, Mn:1.41%, S:0.007%, P:0.012%, Si:
0.30%, V:0.067%, Als:0.025%, Ca:0.0021%.
Continuous casting working procedure: big bag uses argon envelope protection sleeve pipe, uses monoblock type tundish to carry out molding casting, Cross Section of CC Billet
250×360mm；In casting process, continuous casting first is unwrapped and is watered the initial stage pouring basket liquid level addition special coverture of low-alloy, with black slag
Face operation is as the criterion, to reduce the secondary oxidation of molten steel；Casting process carries out Metal in Tundish thermometric once every 10min, in
Between Baogang's coolant-temperature gage be 1549 DEG C, 1552 DEG C, 1555 DEG C, 1553 DEG C, 1550 DEG C.Use rectangular bloom angle steel mould flux, make
With the special coverture of low-alloy；Ladle uses protection sleeve pipe+sealing ring+argon envelope protective casting；Mould flux chemical composition
For SiO2: 31.13%, CaO:29.25%, MgO:0.64%, Fe2O3: 0.58%, Al2O3: 4.99%, Na2O:9.74%, F:2.02%,
C:13.93%.Use M-EMS technology, electric current 520A, frequency 2.5Hz.
Continuous casting billet heats: heating-up temperature 1235 DEG C；Rolling: start rolling temperature 1043 DEG C, finishing temperature 846 DEG C；Rolling 200 ×
20mm equal leg angle, aligning: aligning speed 1.2m/s, maximum aligning drafts 4 millimeters.
Embodiment 3
The production method of this big specification Q420C hot-rolled angle steel (chemical composition is shown in Table 1, and performance is shown in Table 2) uses following processing step,
Wherein composition proportion is mass fraction.
Bessemerize terminal: C:0.06%, Mn:0.06%, P:0.012%；Tapping temperature 1635 DEG C.Converter tapping adds silicon
Manganese alloy (Mn:68%, Si:18%) 19.5kg/ ton steel, VN alloy VN16(V:78%) 0.88kg/ ton steel.Deoxidizer steel shot aluminum
(Al:78-82%) 1.2kg/ ton steel.
After tapping, ladle temperature is: 1584 DEG C；Chemical composition: C:0.13%, Mn:1.32%, S:0.025%, P:0.015%,
Si:0.30%, V:0.065%, Als:0.029%.
The LF refine addition slag charge such as Calx, fluorite that enters the station carries out strong mixing slag, uses carborundum deoxidizer to take off oxygen in slag,
Use heated by electrodes to carry out temperature-compensating, after deoxidation, desulfurization are qualified, use aluminum steel to assort aluminum in steel, use mid-carbon fe-mn to join foot
Manganese.Carrying out Ca process after molten steel composition, temperature are qualified, after Ca/Als is qualified, molten steel carries out soft blow.
Departures ladle temperature is: 1590 DEG C；Chemical composition: C:0.17%, Mn:1.42%, S:0.006%, P:0.015%, Si:
0.30%, V:0.065%, Als:0.024%, Ca:0.0020%.
Continuous casting working procedure: big bag uses argon envelope protection sleeve pipe, uses monoblock type tundish to carry out molding casting, Cross Section of CC Billet
250×360mm；In casting process, continuous casting first is unwrapped and is watered the initial stage pouring basket liquid level addition special coverture of low-alloy, with black slag
Face operation is as the criterion, to reduce the secondary oxidation of molten steel；Casting process carries out Metal in Tundish thermometric once every 10min, in
Between Baogang's coolant-temperature gage be 1550 DEG C, 1553 DEG C, 1552 DEG C, 1550 DEG C, 1548 DEG C.Use rectangular bloom angle steel mould flux, make
With the special coverture of low-alloy；Ladle uses protection sleeve pipe+sealing ring+argon envelope protective casting；Mould flux chemical composition
For SiO2: 31.13%, CaO:29.25%, MgO:0.64%, Fe2O3: 0.58%, Al2O3: 4.99%, Na2O:9.74%, F:2.02%,
C:13.93%.Use M-EMS technology, electric current 520A, frequency 2.5Hz.
Continuous casting billet heats: heating-up temperature 1240 DEG C；Rolling: start rolling temperature 1045 DEG C, finishing temperature 848 DEG C；Rolling 220 ×
24mm equal leg angle, aligning: aligning speed 1.2m/s, maximum aligning drafts 3 millimeters.
Embodiment 4
The production method of this big specification Q420C hot-rolled angle steel (chemical composition is shown in Table 1, and performance is shown in Table 2) uses following processing step,
Wherein composition proportion is mass fraction.
Bessemerize terminal: C:0.09%, Mn:0.08%, P:0.011%；Tapping temperature 1620 DEG C.Converter tapping adds silicon
Manganese alloy (Mn:68%, Si:18%) 20.1kg/ ton steel, VN alloy VN16(V:78%) 0.90kg/ ton steel.Deoxidizer steel shot aluminum
(Al:78-82%) 1.2kg/ ton steel.
After tapping, ladle temperature is: 1565 DEG C；Chemical composition: C:0.15%, Mn:1.35%, S:0.020%, P:0.014%,
Si:0.31%, V:0.066%, Als:0.032%.
The LF refine addition slag charge such as Calx, fluorite that enters the station carries out strong mixing slag, uses carborundum deoxidizer to take off oxygen in slag,
Use heated by electrodes to carry out temperature-compensating, after deoxidation, desulfurization are qualified, use aluminum steel to assort aluminum in steel, use mid-carbon fe-mn to join foot
Manganese.Carrying out Ca process after molten steel composition, temperature are qualified, after Ca/Als is qualified, molten steel carries out soft blow.
Departures ladle temperature is: 1589 DEG C；Chemical composition: C:0.17%, Mn:1.42%, S:0.005%, P:0.014%, Si:
0.31%, V:0.066%, Als:0.025%, Ca:0.0020%.
Continuous casting working procedure: big bag uses argon envelope protection sleeve pipe, uses monoblock type tundish to carry out molding casting, Cross Section of CC Billet
250×360mm；In casting process, continuous casting first is unwrapped and is watered the initial stage pouring basket liquid level addition special coverture of low-alloy, with black slag
Face operation is as the criterion, to reduce the secondary oxidation of molten steel；Casting process carries out Metal in Tundish thermometric once every 10min, in
Between Baogang's coolant-temperature gage be 1548 DEG C, 1549 DEG C, 1552 DEG C, 1551 DEG C, 1547 DEG C.Use rectangular bloom angle steel mould flux, make
With the special coverture of low-alloy；Ladle uses protection sleeve pipe+sealing ring+argon envelope protective casting；Mould flux chemical composition
For SiO2: 31.13%, CaO:29.25%, MgO:0.64%, Fe2O3: 0.58%, Al2O3: 4.99%, Na2O:9.74%, F:2.02%,
C:13.93%.Use M-EMS technology, electric current 520A, frequency 2.5Hz.
Continuous casting billet heats: heating-up temperature 1248 DEG C；Rolling: start rolling temperature 1050 DEG C, finishing temperature 850 DEG C；Rolling 250 ×
28mm equal leg angle, aligning: aligning speed 1.0m/s, maximum aligning drafts 3 millimeters.
Embodiment 5
The production method of this big specification Q420C hot-rolled angle steel (chemical composition is shown in Table 1, and performance is shown in Table 2) uses following processing step,
Wherein composition proportion is mass fraction.
Bessemerize terminal: C:0.06%, Mn:0.06%, P:0.011%；Tapping temperature 1625 DEG C.Converter tapping adds silicon
Manganese alloy (Mn:68%, Si:18%) 19.5kg/ ton steel, VN alloy VN16(V:78%) 0.9kg/ ton steel.Deoxidizer steel shot aluminum
(Al:78-82%) 1.2kg/ ton steel.
After tapping, ladle temperature is: 1570 DEG C；Chemical composition: C:0.13%, Mn:1.32%, S:0.023%, P:0.014%,
Si:0.29%, V:0.066%, Als:0.029%.
The LF refine addition slag charge such as Calx, fluorite that enters the station carries out strong mixing slag, uses carborundum deoxidizer to take off oxygen in slag,
Use heated by electrodes to carry out temperature-compensating, after deoxidation, desulfurization are qualified, use aluminum steel to assort aluminum in steel, use mid-carbon fe-mn to join foot
Manganese.Carrying out Ca process after molten steel composition, temperature are qualified, after Ca/Als is qualified, molten steel carries out soft blow.
Departures ladle temperature is: 1592 DEG C；Chemical composition: C:0.15%, Mn:1.40%, S:0.006%, P:0.015%, Si:
0.29%, V:0.066%, Als:0.024%, Ca:0.0019%.
Continuous casting working procedure: big bag uses argon envelope protection sleeve pipe, uses monoblock type tundish to carry out molding casting, Cross Section of CC Billet
250×360mm；In casting process, continuous casting first is unwrapped and is watered the initial stage pouring basket liquid level addition special coverture of low-alloy, with black slag
Face operation is as the criterion, to reduce the secondary oxidation of molten steel；Casting process carries out Metal in Tundish thermometric once every 10min, in
Between Baogang's coolant-temperature gage be 1550 DEG C, 1552 DEG C, 1553 DEG C, 1551 DEG C, 1549 DEG C.Ladle uses protection sleeve pipe+sealing ring+argon
Envelope protective casting.Use M-EMS technology, electric current 520A, frequency 2.5Hz.
Continuous casting billet heats: heating-up temperature 1250 DEG C；Rolling: start rolling temperature 1045 DEG C, finishing temperature 840 DEG C；Rolling 200 ×
14mm equal leg angle, aligning: aligning speed 1.2m/s, maximum aligning drafts 4 millimeters.
Embodiment 6
The production method of this big specification Q420C hot-rolled angle steel (chemical composition is shown in Table 1, and performance is shown in Table 2) uses following processing step,
Wherein composition proportion is mass fraction.
Bessemerize terminal: C:0.10%, Mn:0.08%, P:0.010%；Tapping temperature 1628 DEG C.Converter tapping adds silicon
Manganese alloy (Mn:68%, Si:18%) 19.2kg/ ton steel, VN alloy VN16(V:78%) 0.84kg/ ton steel.Deoxidizer steel shot aluminum
(Al:78-82%) 1.2kg/ ton steel.
After tapping, ladle temperature is: 1575 DEG C；Chemical composition: C:0.15%, Mn:1.32%, S:0.021%, P:0.013%,
Si:0.29%, V:0.062%, Als:0.031%.
The LF refine addition slag charge such as Calx, fluorite that enters the station carries out strong mixing slag, uses carborundum deoxidizer to take off oxygen in slag,
Use heated by electrodes to carry out temperature-compensating, after deoxidation, desulfurization are qualified, use aluminum steel to assort aluminum in steel, use mid-carbon fe-mn to join foot
Manganese.Carrying out Ca process after molten steel composition, temperature are qualified, after Ca/Als is qualified, molten steel carries out soft blow.
Departures ladle temperature is: 1588 DEG C；Chemical composition: C:0.18%, Mn:1.37%, S:0.005%, P:0.014%, Si:
0.29%, V:0.062%, Als:0.028%, Ca:0.0020%.
Continuous casting working procedure: big bag uses argon envelope protection sleeve pipe, uses monoblock type tundish to carry out molding casting, Cross Section of CC Billet
250×360mm；In casting process, continuous casting first is unwrapped and is watered the initial stage pouring basket liquid level addition special coverture of low-alloy, with black slag
Face operation is as the criterion, to reduce the secondary oxidation of molten steel；Casting process carries out Metal in Tundish thermometric once every 10min, in
Between Baogang's coolant-temperature gage be 1548 DEG C, 1549 DEG C, 1552 DEG C, 1550 DEG C, 1547 DEG C.Use rectangular bloom angle steel mould flux, steel
Bag uses protection sleeve pipe+sealing ring+argon envelope protective casting；Mould flux chemical composition is SiO2: 31.13%, CaO:
29.25%, MgO:0.64%, Fe2O3: 0.58%, Al2O3: 4.99%, Na2O:9.74%, F:2.02%, C:13.93%.Use crystallizer
Electromagnetic agitating technology, electric current 520A, frequency 2.5Hz.
Continuous casting billet heats: heating-up temperature 1248 DEG C；Rolling: start rolling temperature 1046 DEG C, finishing temperature 846 DEG C；Rolling 200 ×
18mm equal leg angle, aligning: aligning speed 1.2m/s, maximum aligning drafts 5 millimeters.
The chemical composition of the angle steel of each embodiment of table 1 and mass fraction (wt%)
| Embodiment | C | Mn | S | P | Si | V | CEV | Als |
| 1 | 0.17 | 1.42 | 0.006 | 0.015 | 0.29 | 0.065 | 0.43 | 0.024 |
| 2 | 0.16 | 1.41 | 0.007 | 0.012 | 0.30 | 0.067 | 0.42 | 0.021 |
| 3 | 0.17 | 1.42 | 0.006 | 0.015 | 0.30 | 0.065 | 0.43 | 0.0195 |
| 4 | 0.17 | 1.42 | 0.005 | 0.014 | 0.31 | 0.066 | 0.42 | 0.019 |
| 5 | 0.15 | 1.40 | 0.006 | 0.015 | 0.29 | 0.066 | 0.40 | 0.019 |
| 6 | 0.18 | 1.37 | 0.005 | 0.014 | 0.29 | 0.062 | 0.43 | 0.024 |
The angle steel performance test results of each embodiment of table 2
。
Claims (10)
1. a big specification Q420C hot rolling equal angle steel, it is characterised in that described angle steel chemical composition and mass fraction are as follows:
C:0.15-0.18%, Mn:1.35-1.55%, Si:0.25-0.50%, S≤0.020%, P≤0.025%, V:0.055-0.075%,
Als >=0.015%, CEV≤0.44%, surplus is ferrum and inevitable impurity.
One the most according to claim 1 big specification Q420C hot rolling equal angle steel, it is characterised in that described angle steel chemistry
Composition and mass fraction are as follows: C:0.15-0.18%, Mn:1.37-1.42%, Si:0.28-0.32%, S≤0.020%, P≤
0.025%, V:0.060-0.070%, Als >=0.019%, CEV≤0.44%, surplus is ferrum and inevitable impurity.
One the most according to claim 1 and 2 big specification Q420C hot rolling equal angle steel, it is characterised in that described angle steel is advised
Lattice are 18#-25#.
4. production method based on a kind of big specification Q420C hot rolling equal angle steel described in claim 1-3 any one, specifically
Step includes: converter smelting, LF external refining, continuous casting, and continuous casting billet heats, rolling, aligning, it is characterised in that described converter smelting
Refining operation, uses V-N micro-alloying technology, adds VN alloy VN16, and the mass fraction controlling V is 0.060-0.070%.
The production method of a kind of big specification Q420C hot rolling equal angle steel the most according to claim 4, it is characterised in that institute
Stating converter smelting operation, the mass fraction controlling converter tapping ladle sample C is 0.10-0.15%, uses silicomangan to carry out manganese, silicon
Alloying, the mass fraction controlling Mn is 1.30-1.35%；Mass fraction≤0.020% of P, the mass fraction of Als is 0.020-
0.035%。
The production method of a kind of big specification Q420C hot rolling equal angle steel the most according to claim 4, it is characterised in that institute
Stating LF external refining operation, the mass fraction controlling C is 0.15-0.18%, Mn:1.38-1.50%, Si:0.28-0.35%, S≤
0.020%, P≤0.025%, V:0.060-0.070%, Als:0.020-0.030%, CEV≤0.44%.
The production method of a kind of big specification Q420C hot rolling equal angle steel the most according to claim 4, it is characterised in that institute
State LF external refining operation, the first bag Ca/Als >=0.11, even water heat Ca/Als:0.06-0.10.
8., according to the production method of a kind of big specification Q420C hot rolling equal angle steel described in claim 4-7 any one, it is special
Levy and be, described continuous casting working procedure, use rectangular bloom angle steel mould flux, mould flux chemical composition is SiO2: 31.13%,
CaO:29.25%, MgO:0.64%, Fe2O3: 0.58%, Al2O3: 4.99%, Na2O:9.74%, F:2.02%, C:13.93%；Use low
The special coverture of alloy；Ladle uses protection sleeve pipe+sealing ring+argon envelope protective casting；Described continuous casting working procedure, uses crystallizer
Electromagnetic agitating technology, electric current 520A, frequency 2.5Hz.
9., according to the production method of a kind of big specification Q420C hot rolling equal angle steel described in claim 4-7 any one, it is special
Levy and be, described continuous casting billet heating process, heating-up temperature 1150-1250 DEG C.
10. according to the production method of a kind of big specification Q420C hot rolling equal angle steel described in claim 4-7 any one, its
It is characterised by, described rolling process, controls start rolling temperature 1000-1050 DEG C, finishing temperature 790-850 DEG C；Described aligning operation,
Angle steel maximum aligning drafts≤5 millimeter, aligning speed is 1.0-1.2m/s.
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| CN106834947A (en) * | 2017-02-27 | 2017-06-13 | 钢铁研究总院 | A kind of C grades of angle steel continuous casting process of big aligning strain |
| CN115074623A (en) * | 2022-06-16 | 2022-09-20 | 唐山钢铁集团高强汽车板有限公司 | Hydrogen-induced cracking resistant galvanized hot stamping steel and production method thereof |
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| CN106834947B (en) * | 2017-02-27 | 2019-02-01 | 钢铁研究总院 | A kind of C grades of angle steel continuous casting process of big aligning strain |
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