CN100379884C - Method for producing ultra high temperature bainitic steel in ultralow carbon - Google Patents
Method for producing ultra high temperature bainitic steel in ultralow carbon Download PDFInfo
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- CN100379884C CN100379884C CNB2006100200501A CN200610020050A CN100379884C CN 100379884 C CN100379884 C CN 100379884C CN B2006100200501 A CNB2006100200501 A CN B2006100200501A CN 200610020050 A CN200610020050 A CN 200610020050A CN 100379884 C CN100379884 C CN 100379884C
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Abstract
This invention discloses a technique for obtaining high-strength superlow-carbon Bainitic steel. The technique comprises: (1) smelting superlow-carbon Bainitic steel at an initial temperature 1050-1150 deg.C and a final temperature of 700-750 deg.C, and quenching by using the smelting waste heat; (2) placing the quenched steel body on the flatform of 200 ton cold-pressing testing machine, pressing at room temperature, and terminating the pressing when the pressing flat down quantity reaches 70-75%; (3) placing the pressed steel plate in a furnace, heating to 200-250 deg.C, keeping the temperature for 1-2 h, and cooling in air to room temperature to obtain high-strength superlow-carbon Bainitic steel. Testing results show that the Rockwell hardness and tensile strength of the high-strength superlow-carbon Bainitic steel are largely increased, and the technique is very simple.
Description
Technical field
The present invention relates in ultra-low-carbon bainite steel, obtain the processing method of superstrength, specifically, relate to ultra-low-carbon bainite steel is carried out heat one cold compound deformation, carry out low temperature aging thermal treatment then to obtain the processing method of superstrength.
Background technology
Ultra-low-carbon bainite steel is thought 21 century one of the most promising steel grade in the world, is mainly used in structure, hydropower station pressure steel pipe and the Oil and Natural Gas Transportation Pipeline etc. of building modern bridge and ships.The design of this class steel has broken through the composition Design Mode of original high-strength low-alloy steel, significantly reduced the carbon content in the steel, its massfraction is usually less than 0.05%, the intensity of steel no longer relies on carbon content, no longer mainly rely on the solution strengthening effect of carbon, manganese and silicon, but rely in the cold deformation process of controlled rolling-control, the refinement of bainite structure, dislocations strengthening, trace vanadium, niobium or titanium elements separate out with the form of diffusion carbide and superfine ε-copper phase separate out the precipitation strength that is caused, thereby make this class steel have higher intensity; According to the alloying element kind of steel and the difference of addition thereof, the yield strength rank of existing ultra-low-carbon bainite steel supply of material attitude is at 400～900MPa both at home and abroad, the tensile strength rank is in the scope of 500～1100MPa, the high-yield strength rank of the supply of material attitude ultra-low-carbon bainite steel that China is present is 800MPa, and the maximum pulling strength rank is 1000MPa; Because this class Carbon Content Of Steel is extremely low, alloying element content seldom, so its weldability is fine, and good impelling strength is arranged.
Can the utmost point low carbon content of ultra-low-carbon bainite steel and the characteristics of other alloying element content make this class steel reach the suitable strength state by existing controlled rolling-cooling control technology? if do not reach the suitable strength state, which kind of processing method can further excavate the potentiality of its intensity by, be the problem explored of relevant field both at home and abroad.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of ultra high temperature bainitic steel in ultralow carbon, this method is not only easy and simple to handle but also can obtain the ultra-low-carbon bainite steel of superstrength.
The object of the present invention is achieved like this, at first utilizes the conventional deformation of forging, and ultra-low-carbon bainite steel 1050～1150 ℃ of initial forging temperatures, is forged under the condition that final forging temperature is 700～750 ℃, directly utilizes remnant forging thermal quenching then; At room temperature ultra-low-carbon bainite steel behind the remnant forging thermal quenching is depressed (title is colded pressing), when draught reaches 70～75%, finish to cold pressing; Ultra-low-carbon bainite steel after will colding pressing is heat-treated, 1～2 hour (title timeliness) of insulation when temperature rises to 200～250 ℃, and air cooling is to room temperature subsequently; Ultra-low-carbon bainite steel sheet after the thermal treatment is surveyed Rockwell hardness, and according to the mechanical property handbook of steel, institute is surveyed Rockwell hardness number be converted into tensile strength values, the result shows, Rockwell hardness and the tensile strength of handling the gained ultra-low-carbon bainite steel through processing method of the present invention improve greatly, and easy and simple to handle.
Technical process of the present invention and characteristics thereof:
1. to the forging thermal deformation of supply of material attitude ultra-low-carbon bainite steel material and utilize waste heat direct quenching to handle
With the ultra-low-carbon bainite steel material 1050～1150 ℃ of initial forging temperatures, forge under the condition that final forging temperature is 700～750 ℃, directly utilize immediate quenching behind the forging molding, its objective is to forge to forge to the final forging temperature scope and make the steel billet homogeneous microstructure and make its moulding in the beginning, finishing to forge also direct quenching in final forging temperature makes a large amount of lattice defects can effectively hinder the growth of bainite structure, thereby obtain the bainite structure that size is tiny and growth orientation is disorderly, this is a kind of for the Preparedness Directorate of the follow-up deformation process of colding pressing, to be organized as orientation clearly demarcated pencil bainite structure and its size thicker and conventional cooling controlling and rolling controlling process obtained, and the difference of two kinds of different process gained microstructures is completely different to the contribution of performance separately;
2. the ultra-low-carbon bainite steel material behind forging deformation and the immediate quenching is carried out the pressing treatment of room temperature aximal deformation value
Ultra-low-carbon bainite steel material behind the remnant forging thermal quenching is depressed (title is colded pressing) in room temperature, when reaching 70～75%, finishes draught to cold pressing, can make this moment original bainite structure produce intensive strain-hardening and reinforcement, still can not obtain the super-strengthening effect that obtains by the inventive method by conventional moulding and heat treatment mode thereof;
3. the ultra-low-carbon bainite steel material through room temperature compacting distortion is carried out ageing treatment
Ultra-low-carbon bainite steel after will colding pressing places heat treatment furnace intensification heating, 1～2 hour (title timeliness) of insulation when temperature rises to 200～250 ℃, air cooling is to room temperature subsequently, its objective is in order to pass through timeliness, make the deformation bainite structure further produce precipitation strength, and the internal stress of eliminating cold deformation to a certain extent and being brought, with the tearing tendency that prevents that stress concentration from being brought;
4. the ultra-low-carbon bainite steel after adding low temperature aging thermal treatment through heat one cold compound deformation is surveyed Rockwell hardness and carried out intensity conversion
Ultra-low-carbon bainite steel sheet after adding low temperature aging thermal treatment through above hot one cold compound deformation is surveyed Rockwell hardness, and institute is surveyed Rockwell hardness number be converted into tensile strength values, the strengthening effect of processing method of the present invention and common process method can be compared, thereby obtain the data foundation of complete strongization effect.
Description of drawings
Fig. 1 is for using the micro-organization chart of processing method gained ultra high temperature bainitic steel in ultralow carbon of the present invention;
Fig. 2 is for using the preceding ultra-low-carbon bainite steel micro-organization chart of the inventive method.
Embodiment
Method of the present invention may further comprise the steps:
1. the ultra-low-carbon bainite steel after controlled rolling and controlled cooling is handled is carried out common forging molding processing, the Forge Heating initial forging temperature is 1050～1150 ℃, and final forging temperature is 700～750 ℃, directly utilizes remnant forging thermal quenching after the steel material is forged into moulding;
2. ultra-low-carbon bainite steel material behind the remnant forging thermal quenching is placed on the cold pressure trier platform of 200 tonnages and depress (title is colded pressing), when draught reaches 70～75%, finish to cold pressing in room temperature;
3. the ultra-low-carbon bainite steel thin plate after will colding pressing places heat treatment furnace intensification heating, 1～2 hour (title timeliness) of insulation when temperature rises to 200～250 ℃, and air cooling is to room temperature subsequently;
4. the ultra-low-carbon bainite steel sheet that above hot one cold compound deformation is added after the low temperature aging thermal treatment is surveyed Rockwell hardness, and institute survey Rockwell hardness number is converted into tensile strength values.
Embodiment:
Selected steel grade is the product of the ultra-low-carbon bainite steel of yield strength 600MPa level one trade mark DB590 (tensile strength 750MPa level) that produces of Wuhan Iron and Steel Company;
1. the ultra-low-carbon bainite steel to supply of material attitude carries out common forging molding processing, and the Forge Heating initial forging temperature is 1100 ℃, and final forging temperature is 750 ℃, will directly utilize remnant forging thermal quenching behind the steel material forging molding;
2. the steel material behind the remnant forging thermal quenching is placed on the cold pressure trier platform of 200 tonnages and depress (title is colded pressing), when draught reaches 70%, finish to cold pressing in room temperature;
3. the ultra-low-carbon bainite steel plate after will colding pressing is heat-treated, 1 hour (title timeliness) of insulation when temperature rises to 200 ℃, and air cooling is to room temperature subsequently;
4. the ultra-low-carbon bainite steel sheet that above hot one cold compound deformation is added after the low temperature aging thermal treatment is surveyed Rockwell hardness, and institute is surveyed Rockwell hardness number be converted into tensile strength values, comparison shows that, the Rockwell hardness of former supply of material attitude ultra-low-carbon bainite steel (DB590 steel) is HRC20, pairing tensile strength is 752.2MPa, the Rockwell hardness of handling gained ultra-low-carbon bainite steel (through the DB590 of the compound deformation-ageing treatment of cold-hot steel) through processing method of the present invention is HRC44, pairing tensile strength is 1406.3MPa, Rockwell hardness has improved 120%, and tensile strength has improved 86.96%.
Fig. 1 and Fig. 2 are respectively the microstructure of the ultra-low-carbon bainite steel DB590 before using processing method of the present invention and not using the inventive method, what as seen adopt processing method acquisition of the present invention is the tiny bainite structure of orientation disorder and size, and what only adopt conventional cooling controlling and rolling controlling process and obtained is clearly demarcated (being pencil) and the thick bainite structure of size of orientation, this is can obtain superstrength from employing the inventive method ultra-low-carbon bainite steel, and adopts the common process method can not obtain the major cause of superstrength in ultra-low-carbon bainite steel.
The present invention has the following advantages and good effect:
1. the present invention provides a kind of process that can obtain superhigh intensity in ultra-low-carbon bainite steel for commercial Application;
2. the present invention is on the basis of former supply of material attitude ultra-low-carbon bainite steel, carries out forge hot one composite deformation one low temperature aging of colding pressing Process, can obtain hardness and the intensity index of present finding highest level in ultra-low-carbon steel;
3. use the inventive method and can under the prerequisite of Ultra-low carbon one microalloy resource, obtain superstrength, thereby can save alloy resource greatly, for the research and development that realize high property/price ratio new steel grade provide a kind of new technological approaches.
Claims (2)
1. the preparation method of a ultra high temperature bainitic steel in ultralow carbon, it is characterized in that, may further comprise the steps: be 1050～1150 ℃ with ultra-low-carbon bainite steel at initial forging temperature 1., final forging temperature is a forging molding under 700～750 ℃ the condition, directly utilizes remnant forging thermal quenching then; 2. at room temperature the ultra-low-carbon bainite steel behind the remnant forging thermal quenching is colded pressing, when draught reaches 70～75%, finish to cold pressing; 3. the ultra-low-carbon bainite steel that will obtain after will colding pressing is heat-treated, and insulation is 1～2 hour when temperature rises to 200～250 ℃, and air cooling to room temperature promptly obtains ultra high temperature bainitic steel in ultralow carbon subsequently.
2. preparation method according to claim 1 is characterized in that, described ultra-low-carbon bainite steel is the ultra-low-carbon bainite steel DB590 of yield strength 600MPa level.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100200501A CN100379884C (en) | 2006-08-29 | 2006-08-29 | Method for producing ultra high temperature bainitic steel in ultralow carbon |
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| CNB2006100200501A CN100379884C (en) | 2006-08-29 | 2006-08-29 | Method for producing ultra high temperature bainitic steel in ultralow carbon |
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| CN100379884C true CN100379884C (en) | 2008-04-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105803171A (en) * | 2016-05-13 | 2016-07-27 | 无锡宝露重工有限公司 | Heat treatment process for low-alloy high-strength structural steel forge piece after forging |
| CN106391956A (en) * | 2016-09-07 | 2017-02-15 | 华侨大学 | Hot press forging manufacturing method for quenchable ultra high strength automobile function part |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1218115A (en) * | 1997-11-24 | 1999-06-02 | 武汉钢铁(集团)公司 | Low carbon and super low carbon copper and boron bainite steel |
| CN1280206A (en) * | 2000-08-11 | 2001-01-17 | 钢铁研究总院 | Super low carbon microalloy high strength steel |
| US6315946B1 (en) * | 1999-10-21 | 2001-11-13 | The United States Of America As Represented By The Secretary Of The Navy | Ultra low carbon bainitic weathering steel |
| KR20020078830A (en) * | 2001-04-10 | 2002-10-19 | 주식회사 포스코 | A method for manufacturing steel wire rod for cold forging with low deviation in mechanical properties |
| CN1390960A (en) * | 1997-07-28 | 2003-01-15 | 埃克森美孚上游研究公司 | Production method for cryogenic weldable ultrahigh-strength steel plates with good toughness |
| CN1521285A (en) * | 2003-01-28 | 2004-08-18 | 鞍山钢铁集团公司 | Ultra-low-carbon bainite steel and producing method thereof |
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- 2006-08-29 CN CNB2006100200501A patent/CN100379884C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1390960A (en) * | 1997-07-28 | 2003-01-15 | 埃克森美孚上游研究公司 | Production method for cryogenic weldable ultrahigh-strength steel plates with good toughness |
| CN1218115A (en) * | 1997-11-24 | 1999-06-02 | 武汉钢铁(集团)公司 | Low carbon and super low carbon copper and boron bainite steel |
| US6315946B1 (en) * | 1999-10-21 | 2001-11-13 | The United States Of America As Represented By The Secretary Of The Navy | Ultra low carbon bainitic weathering steel |
| CN1280206A (en) * | 2000-08-11 | 2001-01-17 | 钢铁研究总院 | Super low carbon microalloy high strength steel |
| KR20020078830A (en) * | 2001-04-10 | 2002-10-19 | 주식회사 포스코 | A method for manufacturing steel wire rod for cold forging with low deviation in mechanical properties |
| CN1521285A (en) * | 2003-01-28 | 2004-08-18 | 鞍山钢铁集团公司 | Ultra-low-carbon bainite steel and producing method thereof |
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