CN1418977A - High-strength high-toughness anchor rod steel bar alloy steel and productive method thereof - Google Patents
High-strength high-toughness anchor rod steel bar alloy steel and productive method thereof Download PDFInfo
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Abstract
The present invention relates to a high-strength high-toughness anchor bar alloy steel and its production method. It is a medium-carbon low-alloy steel, and its chemical composition (wt%) contains: carbon 0.32-0.42%, silicone 0.20-0.40%, manganese 1.0-1.65%, aluminium less than or equal to 0.015%, nitrogen less than 0.015%, phosphorus less than 0.045%, sulfur less than 0.045%, chromium less than or equal to 0.20%, copper less than or equal to 0.25%, nickel les sthan 0.20%, total content of niobium and/or titanium and/or vanadium is less than 0.10% and the rest is iron and inevitable impurity. In the course of smelting steel the carbon, silicone and managanese contents are regulated, the impurity content can be reduced so as to make said steel possess food plasticity and meet the percentage elongation requirements of anchor bar.
Description
Technical field
The invention belongs to ferrous alloy, particularly relate to the medium carbon low alloy steel that contains on rare.
Background technology
Bolt supporting has become the principal mode of coal roadway support, and its use range has expanded to the supporting that soft-rock tunnel, dynamo-electric pillbox chamber, working face are cut eye and coal bunker.Along with the increasing gradually of the pit mining degree of depth, constantly extend to the deep in the tunnel, and the rock stratum geologic condition is increasingly sophisticated, supports difficulty further, and the reliability of bolt supporting, security and Eco-power contradiction also become increasingly conspicuous.The reliability of bolt supporting is a complicated system engineering, and it not only relates to the theory and the method for design of bolt supporting, and with the construction and the quality examination of bolt supporting, and the performance of anchor pole steel all has confidential relation.For the operating rate that further improves the mine, reduce cost, constantly obtain under the prerequisite of new results at support theory and method of design, the performance of anchor pole reinforcing bar has particularly been proposed harsher requirement on material.
Summary of the invention
The purpose of this invention is to provide a kind of have high yield strength, tensile strength, and also have the high-strength high-toughness anchor rod steel bar alloy steel of high-elongation, and the production method of this steel.
The objective of the invention is to realize by the following technical solutions: the production of steel alloy of the present invention is to carry out in electric furnace or converter, concise through the LF refining furnace, after continuous casting becomes strand, become a useful person by continous way or semi continuous merchant bar mill again, the format diameter of becoming a useful person is the 16-40 millimeter, and the reinforcing bar external form obtains through design of steel rolling process pass and technology adjustment according to the needs of supporting design.
How the key problem in technology of this invention is for solving the contradiction between high strength and the high elongation rate, the measure of taking is in the smelting process of steel carbon, silicon, manganese composition to be adjusted, make the steel grade strength property meet the requirements of index, reduce phosphorus, sulphur impurity and other foreign matter contents in the steel, the molten steel cleanliness factor is further improved, and by in the rare earth metal niobium, titanium and/or the vanadium that add trace a kind of, two or three, make this steel grade have good plasticity, satisfy the unit elongation requirement of anchor pole reinforcing bar.
Steel grade provided by the invention is medium carbon low alloy steel (36MnSi), its chemical ingredients contains (by weight percentage): carbon 0.32-0.42%, and silicon 0.20-0.40%, manganese are 1.0-1.65%, aluminium≤0.015%, nitrogen＜0.015%, phosphorus＜0.045%, sulphur＜0.045%, chromium≤0.20%, copper≤0.25%, nickel＜0.20%, surplus is the iron unavoidable impurities.
In steel grade provided by the invention, also can add niobium and or the total amount of titanium and/or vanadium less than 0.10%.
The optimal components of steel grade of the present invention is: carbon 0.32-0.36%, silicon 0.20-0.35%, manganese 1.20-1.65%, aluminium≤0.01%, nitrogen＜0.01%, phosphorus＜0.03%, sulphur＜0.035%, chromium≤0.15%, copper≤0.20%, nickel＜0.20%, surplus are the iron unavoidable impurities, wherein niobium and or the total amount of titanium and/or vanadium less than 0.10%.
The production of steel alloy of the present invention comprises smelting, refining, continuous casting working procedure.
1, smelting technology:
(1) converter smelting should guarantee end point carbon＞0.12%, phosphorus＜0.025%, oxygen in the endpoint molten steel [0]＜800ppm, carburelant carbon increasing amount＜0.05%; Putting the steel temperature is controlled between 1630-1650 ℃;
(2) adopt slag retaining cap and other pushing off the slag modes to tap, thickness of slag layer in the bag＜100 millimeters;
(3) alloying can be pressed the control of composition lower limit in the bag;
2, refinery practice:
In concise operation, only carry out trimming, must not cause a large amount of nitrogen pick-up; Add Ca-Si deoxidizer block 10-15Kg/ stove before the refining tapping.
3, continuous casting working procedure:
(1) in the continuous casting ladle temperature first stove 1500-1540 ℃, connects and draw heat 1500-1520 ℃; Continuous casting working procedure tundish superheating temperature will be controlled at below 15 ℃.
(2) the continuous casting pulling rate must not control above 2 meters/minute.
Specific embodiments
Table 1 is a High strength bolt reinforcing bar steel grade chemical ingredients example of the present invention.
Table 1: high-strength high-toughness anchor rod reinforcing bar steel alloy chemical ingredients (weight %)
| Heat (batch) number | Specification | ????C | ????Si | ????Mn | ??P | ??S |
| ?Y013-2677 | ????φ22 | ????0.34 | ????0.33 | ????1.42 | ??0.018 | ??0.023 |
| ?Y013-2678 | ????φ22 | ????0.37 | ????0.36 | ????1.43 | ??0.026 | ??0.019 |
| ?Y013-2679 | ????φ22 | ????0.33 | ????0.32 | ????1.43 | ??0.018 | ??0.022 |
| ?Y012-2969 | ????φ22 | ????0.34 | ????0.36 | ????1.42 | ??0.022 | ??0.023 |
| ?Y012-2975 | ????φ22 | ????0.33 | ????0.30 | ????1.33 | ??0.018 | ??0.022 |
Table 2 is the yield strength (σ under the High strength bolt reinforcing bar hot-rolled state of the present invention
s), tensile strength (σ
b), unit elongation (δ
5).
Table 2: high strength, high-toughness anchor rod steel bar mechanics performance
| Heat (batch) number | Specification | ????σ s(MPa) | ????σ b(Mb) | ????δ 5(％) |
| ??Y13-2677 | ????φ22 | ????540/530 | ????740/755 | ????22/22 |
| ??Y13-2678 | ????φ22 | ????500/515 | ????725/725 | ????19/22 |
| ?Y13-2679 | ????φ22 | ????490/490 | ????695/695 | ????22/22 |
| ?Y12-2969 | ????φ22 | ????485/495 | ????700/705 | ????22/23 |
| ?Y12-2975 | ????φ22 | ????505/490 | ????715/715 | ????24/23 |
The present invention is further illustrated below in conjunction with specific embodiment.
Example 1:
Heat (batch) number Y013-12983
Converter smelting, 36.00 tons of raw material molten iron add-ons, 8.28 tons of adding amount of scrap steel; Oxygen supply work oxygen is pressed 0.91Mpa, oxygen supply time 13.28 minutes; 1089 kilograms of slag charge mud add-ons, 1058 kilograms of lime adding amounts, 622 kilograms of rhombspar add-ons; 1629 ℃ of catch carbon temperature are put 1633 ℃ of steel temperature.
Deoxidation alloying, 804 kilograms of ferrosilicon and ferromanganese add-ons, 60 kilograms of composite deoxidant add-ons, 15 kilograms of pitch coke add-ons, 20 kilograms of vanadium iron add-ons.
The refining of LF stove, molten steel enter 1575 ℃ of the preceding temperature of refining furnace, and temperature is 1579 ℃ after the refining, refining current consumption 1391 degree, Argon amount 560M
3, refining time 35 minutes, 40 kilograms of insulating covering agent add-ons, 60 millimeters of thickness of slag layer.
3
#Continuous caster continuous casting, ladle 1579 ℃ of liquid steel temperatures during to continuous casting platform, average 1.81 meters/minute of continuous casting pulling rate, average 1528 ℃ of continuous casting tundish temperature, average 417 millimeters of tundish liquid level.
Example 2:
Heat (batch) number Y013-12984
Converter smelting, 36.77 tons of raw material molten iron add-ons, 7.80 tons of adding amount of scrap steel; Oxygen supply work oxygen is pressed 0.92Mpa, oxygen supply time 13.37 minutes; 1075 kilograms of slag charge mud add-ons, 1120 kilograms of lime adding amounts, 639 kilograms of rhombspar add-ons; 1617 ℃ of catch carbon temperature are put 1618 ℃ of steel temperature.
Deoxidation alloying, 800 kilograms of ferrosilicon and ferromanganese add-ons, composite deoxidant add-on 60,30 kilograms of pitch coke add-ons, 20 kilograms of vanadium iron add-ons.
The refining of LF stove, molten steel enter 1559 ℃ of the preceding temperature of refining furnace, and temperature is 1547 ℃ after the refining, refining current consumption 640 degree, Argon amount 210M
3(cubic meter), refining time 28 minutes, 40 kilograms of insulating covering agent add-ons, 70 millimeters of thickness of slag layer.
3
#Continuous caster continuous casting, ladle 1547 ℃ of liquid steel temperatures during to continuous casting platform, average 1.86 meters/minute of continuous casting pulling rate, average 1509 ℃ of continuous casting tundish temperature, average 433 millimeters of tundish liquid level.
Example 3:
Heat (batch) number Y013-12985
Converter smelting, 36.10 tons of raw material molten iron add-ons, 7.70 tons of adding amount of scrap steel; Oxygen supply work oxygen is pressed 0.93Mpa, oxygen supply time 13.12 minutes; 995 kilograms of slag charge mud add-ons, 1115 kilograms of lime adding amounts, 627 kilograms of rhombspar add-ons; 1627 ℃ of catch carbon temperature are put 1627 ℃ of steel temperature.
794 kilograms of deoxidation alloying ferrosilicon and ferromanganese add-ons, 60 kilograms of composite deoxidant add-ons, 35 kilograms of pitch coke add-ons, 20 kilograms of vanadium iron add-ons.
The refining of LF stove, molten steel enter 1569 ℃ of the preceding temperature of refining furnace, and temperature is 1546 ℃ after the refining, refining current consumption 793 degree, Argon amount 303M
3, refining time 40 minutes, 40 kilograms of insulating covering agent add-ons, 95 millimeters of thickness of slag layer.
3# continuous caster continuous casting, ladle 1546 ℃ of liquid steel temperatures during to continuous casting platform, average 1.80 meters/minute of continuous casting pulling rate, average 1519 ℃ of continuous casting tundish temperature, average 467 millimeters of tundish liquid level.
Example 4:
Heat (batch) number Y011-12583
Converter smelting, 35.85 tons of raw material molten iron add-ons, 8.27 tons of adding amount of scrap steel; Oxygen supply work oxygen is pressed 0.95Mpa, oxygen supply time 14.11 minutes; 876 kilograms of slag charge mud add-ons, 1332 kilograms of lime adding amounts, 602 kilograms of rhombspar add-ons; 1619 ℃ of catch carbon temperature are put 1635 ℃ of steel temperature.
Deoxidation alloying, 792 kilograms of ferrosilicon and ferromanganese add-ons, 60 kilograms of composite deoxidant add-ons, 15 kilograms of pitch coke add-ons, 20 kilograms of vanadium iron add-ons.
The refining of LF stove, molten steel enter 1558 ℃ of the preceding temperature of refining furnace, and temperature is 1542 ℃ after the refining, refining current consumption 893 degree, Argon amount 301M
3, refining time 37 minutes, 40 kilograms of insulating covering agent add-ons, 65 millimeters of thickness of slag layer.
3# continuous caster continuous casting, ladle 1547 ℃ of liquid steel temperatures during to continuous casting platform, average 1.79 meters/minute of continuous casting pulling rate, average 1514 ℃ of continuous casting tundish temperature, average 483 millimeters of tundish liquid level.
Example 5:
Heat (batch) number Y011-12587
Converter smelting, 36.02 tons of raw material molten iron add-ons, 8.21 tons of adding amount of scrap steel; Oxygen supply work oxygen is pressed 0.90Mpa, oxygen supply time 15.07 minutes; 784 kilograms of slag charge mud add-ons, 1021 kilograms of lime adding amounts, 621 kilograms of rhombspar add-ons; 1610 ℃ of catch carbon temperature are put 1625 ℃ of steel temperature.
Deoxidation alloying, 762 kilograms of ferrosilicon and ferromanganese add-ons, 60 kilograms of composite deoxidant add-ons, 50 kilograms of pitch coke add-ons, 20 kilograms of vanadium iron add-ons.
The refining of LF stove, molten steel enter 1575 ℃ of the preceding temperature of refining furnace, and temperature is 1540 ℃ after the refining, refining current consumption 527 degree, Argon amount 193M
3, refining time 37 minutes, 40 kilograms of insulating covering agent add-ons, 70 millimeters of thickness of slag layer.
3# continuous caster continuous casting, ladle 1540 ℃ of liquid steel temperatures during to continuous casting platform, average 1.82 meters/minute of continuous casting pulling rate, average 1522 ℃ of continuous casting tundish temperature, average 467 millimeters of tundish liquid level.
Example 6:
Heat (batch) number Y013-12991
Converter smelting, 29.84 tons of this stove raw material molten iron add-ons, 7.90 tons of adding amount of scrap steel; Oxygen supply work oxygen is pressed 0.91Mpa, oxygen supply time 14.65 minutes; 619 kilograms of slag charge mud add-ons, 809 kilograms of lime adding amounts, 601 kilograms of rhombspar add-ons; 1605 ℃ of catch carbon temperature are put 1624 ℃ of steel temperature.
Deoxidation alloying, 697 kilograms of ferrosilicon and ferromanganese add-ons, 60 kilograms of composite deoxidant add-ons, 45 kilograms of pitch coke add-ons, 20 kilograms of vanadium iron add-ons.
The refining of LF stove, molten steel enter 1567 ℃ of the preceding temperature of refining furnace, and temperature is 1540 ℃ after the refining, refining current consumption 897 degree, Argon amount 310M
3, refining time 30 minutes, 40 kilograms of insulating covering agent add-ons, 70 millimeters of thickness of slag layer.
3# continuous caster continuous casting, ladle 1540 ℃ of liquid steel temperatures during to continuous casting platform, average 1.87 meters/minute of continuous casting pulling rate, average 1513 ℃ of continuous casting tundish temperature, average 433 millimeters of tundish liquid level.
Example 7:
Heat (batch) number Y013-12992
Converter smelting, 35.37 tons of this stove raw material molten iron add-ons, 8.00 tons of adding amount of scrap steel; Oxygen supply work oxygen is pressed 0.92Mpa, oxygen supply time 14.50 minutes; 701 kilograms of slag charge mud add-ons, 1192 kilograms of lime adding amounts, 609 kilograms of rhombspar add-ons; 1612 ℃ of catch carbon temperature are put 1626 ℃ of steel temperature.
Deoxidation alloying, 814 kilograms of ferrosilicon and ferromanganese add-ons, 60 kilograms of composite deoxidant add-ons, 55 kilograms of pitch coke add-ons, 20 kilograms of vanadium iron add-ons.
The refining of LF stove, molten steel enter 1571 ℃ of the preceding temperature of refining furnace, and temperature is 1541 ℃ after the refining, refining current consumption 445 degree, Argon amount 191M
3, refining time 34 minutes, 40 kilograms of insulating covering agent add-ons, 65 millimeters of thickness of slag layer, finished product carbon 34%.
3# continuous caster continuous casting, ladle 1541 ℃ of liquid steel temperatures during to continuous casting platform, average 1.98 meters/minute of continuous casting pulling rate, average 1511 ℃ of continuous casting tundish temperature, average 433 millimeters of tundish liquid level.
Example 8:
Heat (batch) number Y013-12994
Converter smelting, 30.18 tons of this stove raw material molten iron add-ons, 7.79 tons of adding amount of scrap steel; Oxygen supply work oxygen is pressed 0.91Mpa, oxygen supply time 13.16 minutes; 337 kilograms of slag charge mud add-ons, 933 kilograms of lime adding amounts, 529 kilograms of rhombspar add-ons; 1602 ℃ of catch carbon temperature are put 1625 ℃ of steel temperature.
Deoxidation alloying, 704 kilograms of ferrosilicon and ferromanganese add-ons, 60 kilograms of composite deoxidant add-ons, 0 kilogram of pitch coke add-on, 20 kilograms of vanadium iron add-ons.
The refining of LF stove, molten steel enter 1576 ℃ of the preceding temperature of refining furnace, and temperature is 1540 ℃ after the refining, refining current consumption 337 degree, Argon amount 156M
3, refining time 23 minutes, 40 kilograms of insulating covering agent add-ons, 50 millimeters of thickness of slag layer.
3# continuous caster continuous casting, ladle 1540 ℃ of liquid steel temperatures during to continuous casting platform, average 2.00 meters/minute of continuous casting pulling rate, average 1507 ℃ of continuous casting tundish temperature, average 433 millimeters of tundish liquid level.
Example 9:
Heat (batch) number Y013-12995
Converter smelting, 36.37 tons of this stove raw material molten iron add-ons, 8.09 tons of adding amount of scrap steel; Oxygen supply work oxygen is pressed 0.92Mpa, oxygen supply time 14.26 minutes; 661 kilograms of slag charge mud add-ons, 994 kilograms of lime adding amounts, 648 kilograms of rhombspar add-ons; 1613 ℃ of catch carbon temperature are put 1619 ℃ of steel temperature.
Deoxidation alloying, 797 kilograms of ferrosilicon and ferromanganese add-ons, 60 kilograms of composite deoxidant add-ons, 70 kilograms of pitch coke add-ons, 20 kilograms of vanadium iron add-ons.
The refining of LF stove, molten steel enter 1562 ℃ of the preceding temperature of refining furnace, and temperature is 1540 ℃ after the refining, refining current consumption 443 degree, Argon amount 194M
3, refining time 21 minutes, 40 kilograms of insulating covering agent add-ons, 65 millimeters of thickness of slag layer.
3# continuous caster continuous casting, ladle 1540 ℃ of liquid steel temperatures during to continuous casting platform, average 2.00 meter per seconds of continuous casting pulling rate, average 1515 ℃ of continuous casting tundish temperature, average 433 millimeters of tundish liquid level.
Example 10:
Heat (batch) number Y011-12595
Converter smelting, 35.78 tons of this stove raw material molten iron add-ons, 7.92 tons of adding amount of scrap steel; Oxygen supply work oxygen is pressed 0.92Mpa, oxygen supply time 14.42 minutes; 964 kilograms of slag charge mud add-ons, 1261 kilograms of lime adding amounts, 541 kilograms of rhombspar add-ons; 1619 ℃ of catch carbon temperature are put 1627 ℃ of steel temperature.
Deoxidation alloying, ferrosilicon and ferromanganese add-on are 786 kilograms, 60 kilograms of composite deoxidant add-ons, 45 kilograms of pitch coke add-ons, 20 kilograms of vanadium iron add-ons.
The refining of LF stove, molten steel enter 1576 ℃ of the preceding temperature of refining furnace, and temperature is 1541 ℃ after the refining, refining current consumption 701 degree, Argon amount 301M
3, refining time 40 minutes, 40 kilograms of insulating covering agent add-ons, 60 millimeters of thickness of slag layer.
3# continuous caster continuous casting, ladle 1541 ℃ of liquid steel temperatures during to continuous casting platform, average 1.96 meter per seconds of continuous casting pulling rate, average 1512 ℃ of continuous casting tundish temperature, average 433 millimeters of tundish liquid level.
Claims (7)
1, a kind of high-strength high-toughness anchor rod steel bar alloy steel and production method thereof, it is characterized in that this steel grade is medium carbon low alloy steel (36MnSi), the chemical ingredients of this steel grade (weight %) is: carbon 0.32-0.42%, silicon 0.20-0.40%, manganese is 1.0-1.65%, aluminium≤0.015%, nitrogen＜0.015%, phosphorus＜0.045%, sulphur＜0.045%, chromium≤0.20%, copper≤0.25%, nickel＜0.20%, surplus be in rare earth metal niobium, titanium and/or the vanadium of iron and unavoidable impurities and trace a kind of, two or three.
2,, it is characterized in that to add in this steel grade the total amount of niobium and/or titanium and/or vanadium less than 0.10% according to the described anchor rod steel bar alloy steel of claim 1.
3,, it is characterized in that the optimal components of this steel grade is: carbon 0.32-0.36%, silicon 0.20-0.35% according to claim 1 and 2 described anchor rod steel bar alloy steels, manganese 1.20-1.65%, aluminium≤0.01%, nitrogen＜0.01%%, phosphorus＜0.03%, sulphur＜0.035%, chromium≤0.15%, copper≤0.20%, nickel＜0.20%, surplus is iron and unavoidable impurities, and wherein the total amount of niobium and/or titanium and/or vanadium is less than 0.10%.
4, the production method of a kind of claim 1 or 2 or 3 described anchor rod steel bar alloy steels, comprise smelting, refining, continuous casting working procedure, smelting technology is to carry out in electric furnace or converter, concise through the LF refining furnace, continuous casting becomes strand, it is characterized in that chemical ingredients (weight %) is: carbon 0.32-0.42%, silicon 0.20-0.40%, manganese is 1.0-1.65%, aluminium≤0.015%, nitrogen＜0.015%, phosphorus＜0.045%, sulphur＜0.045%, chromium≤0.20%, copper≤0.25%, nickel＜0.20%, niobium less than 0.10% and/or titanium and/or vanadium, surplus are the steel of iron and unavoidable impurities, control end point carbon＞0.12% in the converter smelting operation, P＜0.025%, endpoint molten steel [0]＜800ppm, carburelant carbon increasing amount＜0.05% is put the steel temperature and is controlled between 1630-1650 ℃.
5, according to the production method of the described anchor rod steel bar alloy steel of claim 4, it is characterized in that concise operation only carries out trimming, must not cause a large amount of nitrogen pick-up; Before the refining tapping, add Ca-Si deoxidizer block 10-15Kg/ stove.
6, according to the production method of the described anchor rod steel bar alloy steel of claim 4, it is characterized in that the ladle temperature is at 1500-1540 ℃ in the continuous casting, continuous casting working procedure tundish superheating temperature will be controlled at below 15 ℃.
7,, it is characterized in that the continuous casting pulling rate must not control above 2 meters/minute according to the production method of the described anchor rod steel bar alloy steel of claim 4.
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| CN100395368C (en) * | 2005-10-17 | 2008-06-18 | 马鞍山钢铁股份有限公司 | Niobium titanium -combined microalloying steel for cooling-control reinforced bar and method for producing same |
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