CN100580125C - High-strength micro-alloy low-carbon bainite steel and production method thereof - Google Patents
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Abstract
The invention discloses a high-strength microalloy low-carbon bainitic steel and manufacturing method. The mass percentage for the chemical components is as follows: carbon 0.03 to 0.08 percent, silicon 0.20 to 0.35 percent, manganese 1.50 to 1.60 percent, phosphor less than or equal to 0.015 percent, sulfur less than or equal to 0.015 percent, niobium 0.04 to 0.06 percent, titanium 0.008 to 0.02 percent, aluminum 0.02 to 0.05 percent, nickel 0.10 to 0.15 percent, chromium 0.20 to 0.35 percent, molybdenum 0.10 to 0.15 percent, boron 0.0008 to 0.002 percent and vanadium 0.02 to 0.04 percent. The manufacturing sequences are as follows: preparing raw materials (1); smelting in a revolving furnace (2); LF refining (3); VD vacuum degassing (4); continuous casting (5); heating in a mill furnace (6); rough rolling (7); fine rolling (8); ACC controlled cooling (9); tempering processing (10) and storing finished products (11).
Description
Technical field
The present invention relates to a kind of micro-alloy low-carbon bainite steel and production method thereof, particularly relate to a kind of high-strength micro-alloy low-carbon bainite steel and production method thereof with high-strong toughness of good welds performance.
Background technology
High-strength micro-alloy low-carbon bainite steel is the new steel grade of a high technology content, high added value, it is except that having higher yield strength, tensile strength, also have favorable extensibility energy, cold-bending property, welding property and shock resistance, be mainly used in coal machine industry, construction machinery industry and steel structure industry.In actual applications, high-strength micro-alloy low-carbon bainite steel and other steel ratios can reduce the usage quantity of steel, improve steel work-ing life, economize on resources, so be described as 21 century environmental protection steel grade by world's metallurgy industry.
Produce the high tensile steel plate overwhelming majority in the past and adopt the tradition quenching to add the tempered hardening and tempering process, and adopted hardening and tempering process not only to increase production cost, and seriously polluted environment, restricted the further raising of quality product.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of yield strength 〉=570Mpa is provided, tensile strength 〉=690Mpa, low-temperature impact toughness-20 ℃, Akv 〉=120J, the high-strength structure with intensity height, good toughness, good low-temperature flexibility, outstanding processing characteristics and good welding property is with micro-alloy low-carbon bainite steel and production method thereof.
The present invention is achieved by following technical proposals:
High-strength micro-alloy low-carbon bainite steel: the mass percent that comprises alloying element is: carbon=0.03～0.08, silicon=0.20～0.35, manganese=1.50～1.60, phosphorus≤0.015, sulphur≤0.005, niobium, titanium=0.008～0.02, aluminium=0.02～0.05, nickel=0.10～0.15, chromium, molybdenum, vanadium, iron surplus and unavoidable impurities, add boron=0.0008～0.002 in the mass percent of alloying element, and niobium=0.04～0.06, chromium=0.20～0.35, molybdenum=0.10～0.15, vanadium=0.02～0.04.
The production method of high-strength micro-alloy low-carbon bainite steel: comprise that raw material prepares to finished product warehouse-in, raw material prepare and the finished product warehouse-in between technical process be: converter smelting, LF refining, VD vacuum outgas, continuous casting, process furnace heating, roughing, finish rolling, ACC control cold-peace temper.
Described LF purified processing method: refining temperature=1500～1650 ℃; Chemical ingredients fine setting, the slag making deoxidation, refining time 〉=35 minute, omnidistance Argon stirs, refining slag basicity CaO/SiO2≤5.0.The processing method of described VD vacuum outgas: under the working vacuum degree condition of 0.5tor, keep vacuum time more than 15 minutes; Molten steel is carried out denitrogenation, hydrogen, oxygen processing, nitrogen content≤45PPm in the departures molten steel, hydrogen richness≤2.5PPm, oxygen level≤30PPm.The processing method of described process furnace heating: Heating temperature is between 1190 ℃～1250 ℃, the 220mm thickness slab requires heat-up time 〉=3 hours 30 minutes, soaking time 〉=30 minute, the 260mm thickness slab requires heat-up time 〉=4 hour, soaking time 〉=40 minute cold the processing method of described ACC control: 8～15 ℃/S of speed of cooling, 450～550 ℃ of final cooling temperatures.The processing method of described temper: 500～600 ℃ of tempering temperatures, in stove soaking time=50～110 minute.
Compared with prior art, the present invention has the following advantages: under the prerequisite that does not change existing working condition, by optimizing the design of alloy scheme, adopt controlled rolling and controlled cooling to add the tempered processing method and replace traditional hardening and tempering process, simplified production link, reduced production cost, saved the energy, reduced environmental pollution.Present method is applicable to produces the high-strength micro-alloy low-carbon bainite steel steel.
Description of drawings
Accompanying drawing is the process flow sheet of one embodiment of the invention.
Among the figure: the 1-raw material is prepared, the 2-converter smelting, and the 3-LF refining, the 4-VD vacuum outgas, the 5-continuous casting, the heating of 6-process furnace, the 7-roughing, 8-finish rolling, the 9-ACC control is cold, 10-temper, 11-finished product warehouse-in.
Embodiment
The invention will be further described below in conjunction with drawings and Examples:
To produce the trade mark is that Q550D high-strength structure micro-alloy low-carbon bainite steel is an example.
The present invention includes alloying element, iron surplus and unavoidable impurities, the chemical ingredients mass percent of alloying element is: carbon=0.03～0.08, silicon=0.20～0.35, manganese=1.50～1.60, phosphorus≤0.015, sulphur≤0.005, niobium=0.04～0.06, titanium=0.008～0.02, aluminium=0.02～0.05, nickel=0.10～0.15, chromium=0.20～0.35, molybdenum=0.10～0.15, boron=0.0008～0.002, vanadium=0.02～0.04.
With reference to accompanying drawing:
Technical process of the present invention is: raw material prepares 1, converter smelting 2, LF refining 3, VD vacuum outgas 4, continuous casting 5, process furnace heating 6, roughing 7, finish rolling 8, ACC are controlled cold 9, temper 10 and finished product warehouse-in 11.
Described raw material is prepared 1 processing method: routine operation.
The processing method of described converter smelting 2: add molten iron and steel scrap in the converter steelmaking process, molten iron and steel scrap proportioning are 85～95%: 5～15%; Add silicomanganese: Si 〉=17.0%, Mn 〉=65.0%, S≤0.04%, P≤0.25%, C≤1.8% then, iron surplus; Mid-carbon fe-mn alloy: Si≤1.5%, Mn 〉=78.0%, S≤0.03%, P≤0.20%, C≤1.5%, iron surplus; Low carbon ferrochromium alloy: Cr 〉=52.0%, C≤0.50%, Si≤3.0%, P≤0.06%S≤0.05%, iron surplus; Ferrocolumbium: Nb 〉=63.0%, Al≤3.0%, Si≤3.0%, C≤0.20%, P≤0.20%, S≤0.10%, iron surplus; Molybdenum-iron:: 55.0%≤Mo≤65.0%, Si≤1.5%, S≤0.10%, P≤0.05%, C≤0.10%, Cu≤0.50%, Sb≤0.05%, Sn≤0.06%, iron surplus; Nickel plate: nickel 99.9%～100%, impurity surplus; Vanadium iron: V 〉=50.0%, C≤0.75%, Si≤2.5%, P≤0.10%, S≤0.05%, Al≤0.8%, Mn≤0.50%; Ferro-boron: 14.0%≤B≤19.0%, Si≤4.0%, P≤0.10%, S≤0.01%, C≤0.1%, Al≤6.0%; Sial barium: Si 〉=35.00%, Al 〉=12.00%, Ba 〉=18.00%, Al+Ba 〉=30.00%, P≤0.05%, S≤0.10%; Silico-calcium barium: Si 〉=50.0%, Ba＞13.5%, Ca＞12.5%, Ba+Ca 〉=28.0%, P≤0.10%, S≤0.15%, ferro-aluminum: Al 〉=70.0%, iron surplus.
The processing method of described LF stove refining 3: refining temperature: 1500～1650 ℃; Trimming, the slag making deoxidation, refining time 〉=35 minute, omnidistance Argon stirs, refining slag basicity CaO/SiO2＜5.0; Chemical ingredients is finely tuned, make it reach the internally controlling requirement of steel.
The processing method of described VD stove vacuum outgas 4: under the vacuum of 0.5tor, keep vacuum time more than 15 minutes; Molten steel is carried out denitrogenation, hydrogen, oxygen processing, make departures molten steel nitrogen content≤45PPm, hydrogen richness≤2.5PPm, oxygen level≤30PPm increases substantially the molten steel purity.
The processing method of described continuous casting 5: adopt the whole process protection cast, carry out continuous casting at 1520～1550 ℃.
The processing method of described process furnace heating 6: Heating temperature is between 1190～1250 ℃, and the 220mm thickness slab requires heat-up time 〉=3 hours 30 minutes, soaking time 〉=30 minute, and the 260mm thickness slab requires heat-up time 〉=4 hour, soaking time 〉=40 minute
The processing method of described roughing 7: start rolling temperature 〉=1000 ℃ guarantee to have continuous 2 percentage pass reductions 〉=15%.
The processing method of described finish rolling 8: every time draft 〉=10%, 800～850 ℃ of finish rolling finishing temperatures.
Described ACC is controlled cold 9 processing method: speed of cooling=8～15 ℃/S, 450～550 ℃ of final cooling temperatures.
The processing method of described temper 10: 500～600 ℃ of tempering temperatures, in stove soaking time=50～110 minute.
The processing method of described finished product warehouse-in 11: routine operation.
Embodiment 1:
Add molten iron and steel scrap in the converter steelmaking process, molten iron and steel scrap proportioning are: 85%～95% to 5%～15%; Add silicomanganese: Si 〉=17.0%, Mn 〉=65.0%, S≤0.04%, P≤0.25%, C≤1.8% then, iron surplus; Mid-carbon fe-mn alloy: Si≤1.5%, Mn 〉=78.0%, S≤0.03%, P≤0.20%, C≤1.5%, iron surplus; Low carbon ferrochromium alloy: Cr 〉=52.0%, C≤0.50%, Si≤3.0%, P≤0.06%, S≤0.05%, iron surplus; Ferrocolumbium: Nb 〉=63.0%, Al≤3.0%, Si≤3.0%, C≤0.20%, P≤0.20%, S≤0.10%, iron surplus; Molybdenum-iron:: 55.0%≤Mo≤65.0%, Si≤1.5%, S≤0.10%, P≤0.05%, C≤0.10%, Cu≤0.50%, Sb≤0.05%, Sn≤0.06%, iron surplus; Nickel plate: nickel 99.9%～100%, impurity surplus; Vanadium iron: V 〉=50.0%, C≤0.75%, Si≤2.5%, P≤0.10%, S≤0.05%, Al≤0.8%, Mn≤0.50%; Ferro-boron: 14.0%≤B≤19.0%, Si≤4.0%, P≤0.10%, S≤0.01%, C≤0.1%, Al≤6.0%; Sial barium: Si 〉=35.00%, Al 〉=12.00%, Ba 〉=18.00%, Al+Ba 〉=30.00%, P≤0.05%, S≤0.10%; Silico-calcium barium: Si 〉=50.0%, Ba＞13.5%, Ca＞12.5%, Ba+Ca 〉=28.0%, P≤0.10%, S≤0.15%, ferro-aluminum: Al 〉=70.0%, iron surplus.Pass through the refining of LF stove then, refining temperature: 1500～1650 ℃; Trimming, the slag making deoxidation, refining time 〉=35 minute, omnidistance Argon stirs, refining slag basicity CaO/SiO2:3.0; Chemical ingredients is finely tuned, make it reach the internally controlling requirement of steel; The vacuum outgas of VD stove is handled: under the vacuum of 0.5tor, keep making departures molten steel hydrogen richness≤1.5PPm between the vacuum time 20～25 minutes; Carry out continuous casting at 1520～1550 ℃, cast 260mm * 2100mm, 260mm * 2280mm slab.
The process furnace Heating temperature is between 1190～1250 ℃; There is continuous 3 percentage pass reductions 〉=15% roughing start rolling temperature 〉=1000 ℃; Every time draft of finish rolling 〉=11%, 800～820 ℃ of finish rolling finishing temperatures.8～10 ℃/S of ACC speed of cooling, 500～550 ℃ of final cooling temperatures.Tempering temperature=520～550 ℃ are in stove soaking time=50～110 minute.
Adopt the high-strength structure micro-alloy low-carbon bainite steel Q550D of the processing method production of embodiment 1, has tiny even bainite inside metallographic, grain fineness number is controlled at more than 10 grades, organize grain fineness number difference to be controlled in 1.5 grades, mechanical property is even, and mechanical property reaches following index: yield strength 580Mpa is arranged, tensile strength 700Mpa, low-temperature impact toughness-20 ℃, the performance of Akv160J.
Embodiment 2:
Add molten iron and steel scrap in the converter steelmaking process, molten iron and steel scrap proportioning are: 85～95%:5～15%; Add silicomanganese: Si 〉=17.0%, Mn 〉=65.0%, S≤0.04%, P≤0.25%, C≤1.8% then, iron surplus; Mid-carbon fe-mn alloy: Si≤1.5%, Mn 〉=78.0%, S≤0.03%, P≤0.20%, C≤1.5%, iron surplus; Low carbon ferrochromium alloy: Cr 〉=52.0%, C≤0.50%, Si≤3.0%, P≤0.06%, S≤0.05%, iron surplus; Ferrocolumbium: Nb 〉=63.0%, Al≤3.0%, Si≤3.0%, C≤0.20%, P≤0.20%, S≤0.10%, iron surplus; Molybdenum-iron:: 55.0%≤Mo≤65.0%, Si≤1.5%, S≤0.10%, P≤0.05%, C≤0.10%, Cu≤0.50%, Sb≤0.05%, Sn≤0.06%, iron surplus; Nickel plate: nickel 99.9～100%, impurity surplus; Vanadium iron: V 〉=50.0%, C≤0.75%, Si≤2.5%, P≤0.10%, S≤0.05%, Al≤0.8%, Mn≤0.50%; Ferro-boron: 14.0%≤B≤19.0%, Si≤4.0%, P≤0.10%, S≤0.01%, C≤0.1%, Al≤6.0%; Sial barium: Si 〉=35.00%, Al 〉=12.00%, Ba 〉=18.00%, Al+Ba 〉=30.00%, P≤0.05%, S≤0.10%; Silico-calcium barium: Si 〉=50.0%, Ba＞13.5%, Ca＞12.5%, Ba+Ca 〉=28.0%, P≤0.10%, S≤0.15%, ferro-aluminum: Al 〉=70.0%, iron surplus.Pass through the refining of LF stove then, refining temperature: 1500～1650 ℃; Trimming, the slag making deoxidation, refining time 〉=35 minute, omnidistance Argon stirs, refining slag basicity CaO/SiO2:4.0; Chemical ingredients is finely tuned, make it reach the internally controlling requirement of steel; The vacuum outgas of VD stove is handled: under the vacuum of 0.5tor, keep making departures molten steel hydrogen richness≤2.0PPm between the vacuum time 15～22 minutes; Carry out continuous casting at 1520～1550 ℃, cast 260mm * 2100mm, 260mm * 2280mm slab.
The process furnace Heating temperature is between 1190～1250 ℃; There is continuous 2 percentage pass reductions 〉=15% roughing start rolling temperature 〉=1000 ℃; Every time draft of finish rolling 〉=10%, 820～840 ℃ of finish rolling finishing temperatures.10～15 ℃/S of ACC speed of cooling, 450～500 ℃ of final cooling temperatures.Tempering temperature=550～580 ℃ are in stove soaking time=50～110 minute.
Adopt the high-strength structure micro-alloy low-carbon bainite steel Q550D of the processing method production of embodiment 2, has tiny even bainite inside metallographic, grain fineness number is controlled at more than 11 grades, organize grain fineness number difference to be controlled in 1.5 grades, mechanical property is even, and mechanical property reaches following index: yield strength 590Mpa is arranged, tensile strength 710Mpa, low-temperature impact toughness-20 ℃, the performance of Akv140J.
High-strength structure micro-alloy low-carbon bainite steel with aforesaid method production, have intensity height, good toughness, good low-temperature flexibility, outstanding processing characteristics and good welding property, can satisfy the requirement of coal machine industry, construction machinery industry and steel structure industry with steel.
Claims (2)
1. high-strength micro-alloy low-carbon bainite steel, the mass percent that comprises alloying element is: carbon=0.03～0.08, silicon=0.20～0.35, manganese=1.50～1.60, phosphorus≤0.015, sulphur≤0.005, niobium, titanium=0.008～0.02, aluminium=0.02～0.05, nickel=0.10～0.15, chromium, molybdenum, vanadium, iron surplus and unavoidable impurities is characterized in that: add boron=0.0008～0.002 in the mass percent of alloying element, and niobium=0.04～0.06, chromium=0.20～0.35, molybdenum=0.10～0.15, vanadium=0.02～0.04.
2. production method for preparing high-strength micro-alloy low-carbon bainite steel as claimed in claim 1, comprise raw material preparation (1), converter smelting (2), LF refining (3), VD vacuum outgas (4), continuous casting (5), process furnace heating (6), roughing (7), finish rolling (8), ACC control cold (9), temper (10) and finished product warehouse-in (11), the refining temperature of described LF refining (3) is 1500～1650 ℃; Chemical ingredients fine setting, the slag making deoxidation, refining time 〉=35 minute, omnidistance Argon stirs, refining slag basicity CaO/SiO
2≤ 5.0; The processing method of described VD vacuum outgas (4): under the working vacuum degree condition of 0.5tor, keep vacuum time more than 15 minutes; Molten steel is carried out denitrogenation, hydrogen, oxygen processing, nitrogen content≤45PPm in the departures molten steel, hydrogen richness≤2.5PPm, oxygen level≤30PPm; The Heating temperature of described process furnace heating (6) is between 1190～1250 ℃, and the 220mm thickness slab requires heat-up time 〉=3 hours 30 minutes, soaking time 〉=30 minute, and the 260mm thickness slab requires heat-up time 〉=4 hour, soaking time 〉=40 minute; Final cooling temperature=450～550 of described ACC control cold (9) ℃; Tempering temperature=500～600 of described temper (10) ℃ are in stove soaking time=50～110 minute; It is characterized in that: speed of cooling=8～15 of described ACC control cold (9) ℃/s.
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| CN102162061B (en) * | 2010-02-23 | 2013-09-04 | 宝山钢铁股份有限公司 | Low-carbon bainite thick steel plate with high strength and toughness and manufacturing method thereof |
| CN102337482B (en) * | 2010-07-23 | 2013-11-20 | 宝山钢铁股份有限公司 | Bainite high strength and toughness steel plate with yield strength of 900 MPa and manufacture method thereof |
| CN101921953A (en) * | 2010-09-08 | 2010-12-22 | 湖南华菱湘潭钢铁有限公司 | Production method of anti-corrosion and high strength ultra-thick steel plates |
| CN102071362A (en) * | 2011-01-26 | 2011-05-25 | 天津钢铁集团有限公司 | High performance low carbon bainitic steel and production method thereof |
| CN102181619B (en) * | 2011-02-18 | 2013-02-13 | 济钢集团有限公司 | Method for manufacturing non-tempering low-carbon bainite type high-strength steel plate of 1000Mpa grade |
| CN102912224B (en) * | 2012-11-02 | 2014-05-28 | 湖南华菱湘潭钢铁有限公司 | Production method for low-alloy medium-thickness steel plate |
| CN102912223B (en) * | 2012-11-02 | 2014-05-28 | 湖南华菱湘潭钢铁有限公司 | Production method for low-alloy medium-thick steel sheet |
| CN104630603A (en) * | 2013-11-07 | 2015-05-20 | 丹阳智盛合金有限公司 | Iron-chromium-aluminum alloy manufacturing technology |
| CN103602889B (en) * | 2013-11-25 | 2016-01-20 | 天津理工大学 | The reinforcement toughening process of a kind of carbon and the higher ultra low-carbon steel of manganese element content |
| CN103725857A (en) * | 2013-12-27 | 2014-04-16 | 内蒙古包钢钢联股份有限公司 | Method for improving strength of Q550D steel plate |
| CN105063511B (en) * | 2015-08-14 | 2017-03-22 | 武汉钢铁(集团)公司 | Ultra-low carbon bainite thin gauge steel plate rolled through heavy and medium plate mill and production method of ultra-low carbon bainite thin gauge steel plate |
| CN109723512A (en) * | 2017-10-30 | 2019-05-07 | 丹阳市金长汽车部件有限公司 | A kind of engine cam |
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