CN101942613A - Method for processing high-strength and ultrahigh-strength shaped steel - Google Patents
Method for processing high-strength and ultrahigh-strength shaped steel Download PDFInfo
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- CN101942613A CN101942613A CN2010102629626A CN201010262962A CN101942613A CN 101942613 A CN101942613 A CN 101942613A CN 2010102629626 A CN2010102629626 A CN 2010102629626A CN 201010262962 A CN201010262962 A CN 201010262962A CN 101942613 A CN101942613 A CN 101942613A
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Abstract
The invention relates to a method for processing high-strength and ultrahigh-strength shaped steel. The method comprises the following steps: smelting 0.11-0.5% of C, 0.1-1.9% of Si, 0.1-1.9% of Mn, proper amount of trace alloy elements and the balance Fe to obtain billet, heating and rolling to obtain shaped steel. High-strength shaped steel can also be prepared from the existing common shaped steel by the following steps: pulling to send the common shaped steel into an intermediate-frequency and superaudio-frequency heating furnace to be heated, quickly quenching in a cylindrical quenching unit, tempering in an intermediate-frequency heating furnace and cooling in a cooling unit. The yield strength of the shaped steel is greater than or equal to 600-1670 MPa, which is 1-6 times higher than that of common shaped steel; the tempering metallurgical structure is troostite or sorbite; the grain size reaches higher than Grade 9; and the shaped steel has favorable low-temperature impact resistance and high cost performance, can be widely used in high-rise buildings, wide-span steel structures, supporting towers and other import projects, and can also be used in common projects.
Description
Technical field the present invention relates to a kind of steel, the working method of particularly a kind of high strength and superstrength shaped steel.
Background technology is present, domesticly can only produce common shaped steel, as angle steel, channel-section steel, joist steel, H shaped steel etc., because mechanical property is not high, concentrate on Q235, Q345, Q460 rank, can not satisfy the demand of heavy constructions such as Highrise buildings, large-span steel, supporting iron tower, as be used for above-mentioned occasion, exist intensity low, need to increase rolled steel dosage, the problem of waste steel resources; Only adopt ultra-fine brilliant technology to roll out high tensile steel plate abroad and make H shaped steel, yield strength reaches 900～1100MPa, but still exists superstrength not enough, and adds and need add a lot of rare metals man-hour, cost an arm and a leg, other high strength and superstrength shaped steel are not still produced.
Summary of the invention the objective of the invention is to overcome the deficiencies in the prior art, and the working method of a kind of high strength and superstrength shaped steel is provided, and substitutes existing common shaped steel, satisfies the demand of domestic and international market to high strength and superstrength shaped steel.
The present invention seeks to realize like this: press following Chemical Composition: C:0.11～0.5% by steel mill, Si:0.1～1.9%, Mn:0.1～1.9%, select above one or more trace alloying elements: Ni:0.02～0.2%, Nb:0.02～0.8%, Cr:0.02～0.8%, Ti:0.02～0.6%, V:0.01～0.1% and remaining smelted steel billet and heating rolling becomes shaped steel (angle steel for Fe, channel-section steel, joist steel and H shaped steel), high strength shaped steel also can adopt common shaped steel (angle steel, channel-section steel, joist steel and H shaped steel), send into preheating intermediate frequency and ultrasonic frequency process furnace internal heating to 850～1100 ℃ successively through towing mechanism traction transmission, then according to the specification size of shaped steel through the tubular quenching device carry out for the time 3～60 second rapid quenching, be heated to 370～720 ℃ of tempering through tempering heating in medium frequency stove, after refrigerating unit carries out cooling process to normal temperature, thereby produce superstrength shaped steel; Can put into shaped steel in the middle of the ruhmkorff coil in above-mentioned preheating heating in medium frequency stove, ultrasonic frequency process furnace and the tempering heating in medium frequency stove, its profile and shaped steel are complementary, middle and retention gap; Above-mentioned tubular quenching device is made up of inside and outside wall, between tube end sealing, the inside and outside wall hollow be storage chamber, its inwall in length and breadth to distance 1～5cm spray orifice is set respectively, outer wall is provided with the high-pressure nozzle joint, can be connected to high-pressure pump by high-pressure nozzle, carry out high-pressure spraying and quench.
The invention has the beneficial effects as follows: (1) the present invention utilizes " surface action " of the load coil of preheating intermediate frequency and ultrasonic frequency process furnace that rolling good shaped steel is carried out the sectional type heating, can be heated temperature increase to 850～1100 ℃, have the continuous production performance, can satisfy the heating of the shaped steel of different specification size; (2) yield strength of this product 〉=600～1670MPa, intensity is very high, exceeds 1～6 times than the yield strength 234,345 and the 460Mpa of traditional common shaped steel; (3) interior tissue of this product is tempering troostite or sorbite, and grain fineness number can reach more than 9 grades, has the advantage of good low-temperature impact resistance; (4) the tubular quenching device of the present invention's employing, inside and outside wall hollow is provided with spray orifice to 1～5cm in length and breadth on inwall, the high-pressure nozzle joint is arranged on the outer wall, can connect high-pressure pump, open high-pressure pump quench have that quenching hydraulic pressure is big, quenching velocity is fast, the advantage of uniform quenching; (5) the products production cost price only is 1.2 times of original common shaped steel, but because intensity height, the shaped steel consumption can reduce more than 50%, in a large amount of saving steel, can replace the import of high strength H shaped steel, can export goods and earn foreign currency simultaneously, satisfy the demand of domestic and international market, economic benefit and social benefit are very remarkable; (6) it is easy to process feasible to adopt common shaped steel to heat-treat, and yield strength can increase more than 1 times.
Appended drawings 1 is a following process production line schematic flow sheet of the present invention, and Fig. 2 is the application state synoptic diagram of heat induced coil winding of the present invention, and Fig. 3 is a tubular quenching device structural representation of the present invention.
Among the figure: on behalf of transmission bracket, 2,1 represent preheating heating in medium frequency stove, 3 to represent ultrasonic frequency process furnace, 4 to represent tubular quenching device, 5 to represent tempering heating in medium frequency stove, 6 to represent refrigerating unit, 7 to represent towing mechanism, 8 to represent shaped steel (as angle bar, joist steel, channel-section steel, H shaped steel), 9 to represent ruhmkorff coil, 10 to represent tube end, 11 to represent outer wall, 12 to represent inwall, 13 to represent storage chamber, 14 to represent spray orifice, 15 to represent the high-pressure nozzle joint
The invention will be further described for 9 embodiment below in conjunction with accompanying drawing 1～3 for embodiment.
Example 1: as shown in Figure 2, process the heating in medium frequency stove 2, ultrasonic frequency process furnace 3 and the tempering heating in medium frequency stove 5 that have the ruhmkorff coil 9 that is complementary with shaped steel 8 profiles earlier; Again as shown in Figure 3, process inwall 12 and outer wall 11 and to distance 3cm the tubular quenching device 4 that has high-pressure nozzle joint 15 on spray orifice 14, the outer wall 11 is set in length and breadth on hollow, 10 sealings of tube end, the inwall 12 between the two; At last as shown in Figure 1, according to the requirement of following process method, be ready to the following process production line, tubular quenching device 4 is connected high-pressure pump simultaneously, and towing mechanism 7, preheating heating in medium frequency stove 2, ultrasonic frequency process furnace 3, tempering heating in medium frequency stove 5, refrigerating unit 6 are connected power supply; Simultaneously press C:0.11%, Si:0.15%, Mn:1.9% by steel mill; Select three kinds of trace alloying element Ni:0.02%, Nb:0.045%, Cr:0.05% and remaining be the Fe Chemical Composition shaped steel 8 (angle steel) that to have smelted steel billet and the good specification of heating rolling be 5cm * 5cm, transport it into the following process production line in following process place again, through towing mechanism 7 tractions, by transmission bracket 1 as the carriage transmission, being pulled device 7 successively sends into preheating heating in medium frequency stove 2 and ultrasonic frequency process furnace 3 and carries out the sectional type heating, be heated to 855 ℃, then by tubular quenching device 4 carry out for the time 3 seconds rapid quenching, then be heated to 710 ℃ of tempering through tempering heating in medium frequency stove 5, arrive normal temperature by refrigerating unit 6 cooling process at last, so just, producing yield strength is the superstrength shaped steel 8 (angle steel) of 650MPa, and its inside metallographic is that grain fineness number reaches 9 grades sorbite.
Example 2: process preheating heating in medium frequency stove 2, ultrasonic frequency process furnace 3, tempering heating in medium frequency stove 5 and tubular quenching device 4 by example 1 described method earlier, the distance of the spray orifice 14 on the inwall 12 of this tubular quenching device 4 changes 1cm into, and is ready to production line by the requirement of post-treatment method as shown in Figure 1; Simultaneously, press C:0.25%, Si:0.80%, Mn:1.2% by steel mill; Select three kinds of trace alloying element Ni:0.1%, Cr:0.25%, Ti:0.045% and remaining be the Fe shaped steel 8 (angle steel) that to have smelted steel billet and the good specification of heating rolling be 10cm * 10cm, transport it into the following process place again, through towing mechanism 7 tractions, by transmission bracket 1 as the carriage transmission, being pulled device 7 successively sends into preheating heating in medium frequency stove 2 and ultrasonic frequency process furnace 3 and carries out the sectional type heating, be heated to 930 ℃, then by tubular quenching device 4 carry out for the time 10 second rapid quenching, then be heated to 500 ℃ of tempering through tempering heating in medium frequency stove 5, arrive normal temperature by refrigerating unit 6 cooling process at last, so just, producing yield strength is the superstrength shaped steel 8 (angle steel) of 1200MPa, and its inside metallographic is that grain fineness number reaches 9 grades sorbite.
Example 3: process preheating heating in medium frequency stove 2, ultrasonic frequency process furnace 3, tempering heating in medium frequency stove 5 and tubular quenching device 4 by example 1 described method earlier, spray orifice 14 distances on the inwall 12 of this tubular quenching device 4 change 5cm into, and are ready to production line by the requirement of post-treatment method as shown in Figure 1; Simultaneously, press C:0.45%, Si:1.9%, Mn:0.25% by steel mill; Select four kinds of trace alloying element Ni:0.2%, Nb:0.7%, Cr:0.5%, V:0.035% and remaining be the Fe Chemical Composition shaped steel 8 (angle steel) that to have smelted steel billet and the good specification of heating rolling be 20cm * 20cm, transport it into the following process place again, through towing mechanism 7 tractions, by transmission bracket 1 as the carriage transmission, being pulled device 7 successively sends into preheating heating in medium frequency stove 2 and ultrasonic frequency process furnace 3 and carries out the sectional type heating, be heated to 990 ℃, then by tubular quenching device 4 carry out for the time 20 seconds rapid quenching, then be heated to 370 ℃ of tempering through tempering heating in medium frequency stove 5, arrive normal temperature by refrigerating unit 6 cooling process at last, so just, producing yield strength is the superstrength shaped steel 8 (angle steel) of 1660MPa, and its inside metallographic is that grain fineness number reaches 9 grades sorbite.
Example 4: process preheating heating in medium frequency stove 2, ultrasonic frequency process furnace 3, tempering heating in medium frequency stove 5 and tubular quenching device 4 by example 1 described method earlier, the distance of the spray orifice 14 on the inwall 12 of this tubular quenching device 4 changes 1cm into, and is ready to production line by the requirement of post-treatment method as shown in Figure 1; Simultaneously, with specification is common shaped steel 8 (angle steel) process towing mechanism 7 tractions of 10cm * 10cm, by transmission bracket 1 as the carriage transmission, being pulled device 7 successively sends into preheating heating in medium frequency stove 2 and ultrasonic frequency process furnace 3 and carries out the sectional type heating, be heated to 930 ℃, then by tubular quenching device 4 carry out for the time 10 second rapid quenching, then be heated to 520 ℃ of tempering through tempering heating in medium frequency stove 5, arrive normal temperature by refrigerating unit 6 cooling process at last, so just, producing yield strength is the high strength shaped steel 8 (angle steel) of 700MPa, and its inside metallographic is that grain fineness number reaches 9 grades sorbite.
Example 5: process preheating heating in medium frequency stove 2, ultrasonic frequency process furnace 3, tempering heating in medium frequency stove 5 and tubular quenching device 4 by example 1 described method earlier, spray orifice 14 distances on the inwall 12 of this tubular quenching device 4 change 5cm into, and are ready to production line by the requirement of post-treatment method as shown in Figure 1; Simultaneously, press C:0.11%, Si:0.15%, Mn:1.9% by steel mill; Select three kinds of trace alloying element Ni:0.02%, Nb:0.045%, Cr:0.05% and remaining be the Fe Chemical Composition shaped steel 8 (channel-section steel) that to have smelted steel billet and the good specification of heating rolling be 5cm * 3.7cm, transport it into the following process place again, through towing mechanism 7 tractions, by transmission bracket 1 as the carriage transmission, being pulled device 7 successively sends into preheating heating in medium frequency stove 2 and ultrasonic frequency process furnace 3 and carries out the sectional type heating, be heated to 850 ℃, then by tubular quenching device 4 carry out for the time 5 seconds rapid quenching, then be heated to 650 ℃ of tempering through tempering heating in medium frequency stove 5, arrive normal temperature by refrigerating unit 6 cooling process at last, so just, producing yield strength is the superstrength shaped steel 8 (channel-section steel) of 650MPa, and its inside metallographic is that grain fineness number reaches 9 grades sorbite.
Example 6: process preheating heating in medium frequency stove 2, ultrasonic frequency process furnace 3, tempering heating in medium frequency stove 5 and tubular quenching device 4 by example 1 described method earlier, spray orifice 14 distances on the inwall 12 of this tubular quenching device 4 change 3cm into, and are ready to production line by the requirement of post-treatment method as shown in Figure 1; Simultaneously, press C:0.25%, Si:0.80%, Mn:1.2% by steel mill; Select three kinds of trace alloying element Ni:0.1%, Cr:0.25%, Ti:0.045% and remaining be the Fe Chemical Composition shaped steel 8 (channel-section steel) that to have smelted steel billet and the good specification of heating rolling be 20cm * 7.5cm, transport it into the following process place again, through towing mechanism 7 tractions, by transmission bracket 1 as the carriage transmission, being pulled device 7 successively sends into preheating heating in medium frequency stove 2 and ultrasonic frequency process furnace 3 and carries out the sectional type heating, be heated to 930 ℃, then by tubular quenching device 4 carry out for the time 20 seconds rapid quenching, then be heated to 500 ℃ of tempering through tempering heating in medium frequency stove 5, arrive normal temperature by refrigerating unit 6 cooling process at last, so just, producing yield strength is the superstrength shaped steel 8 (channel-section steel) of 1200MPa, and its inside metallographic is that grain fineness number reaches 9 grades sorbite.
Example 7: process preheating heating in medium frequency stove 2, ultrasonic frequency process furnace 3, tempering heating in medium frequency stove 5 and tubular quenching device 4 by example 1 described method earlier, spray orifice 14 distances on the inwall 12 of this tubular quenching device 4 change 1cm into, and are ready to production line by the requirement of post-treatment method as shown in Figure 1; Simultaneously, press C:0.45%, Si:1.9%, Mn:0.25% by steel mill; Select four kinds of trace alloying element Ni:0.2%, Nb:0.7%, Cr:0.5%, V:0.035% and remaining be the Fe Chemical Composition shaped steel 8 (channel-section steel) that to have smelted steel billet and the good specification of heating rolling be 40cm * 10cm, transport it into the following process place again, through towing mechanism 7 tractions, by transmission bracket 1 as the carriage transmission, being pulled device 7 successively sends into preheating heating in medium frequency stove 2 and ultrasonic frequency process furnace 3 and carries out the sectional type heating, be heated to 1000 ℃, then by tubular quenching device 4 carry out for the time 60 seconds rapid quenching, then be heated to 370 ℃ of tempering through tempering heating in medium frequency stove 5, arrive normal temperature by refrigerating unit 6 cooling process at last, so just, producing yield strength is the superstrength shaped steel 8 (channel-section steel) of 1660MPa, and its inside metallographic is that grain fineness number reaches 9 grades sorbite.
Example 8: process preheating heating in medium frequency stove 2, ultrasonic frequency process furnace 3, tempering heating in medium frequency stove 5 and tubular quenching device 4 by example 1 described method earlier, the distance of the spray orifice 14 on the inwall 12 of this tubular quenching device 4 changes 3cm into, and is ready to production line by the requirement of post-treatment method as shown in Figure 1; Simultaneously, with specification is common shaped steel 8 (channel-section steel) process towing mechanism 7 tractions of 20cm * 7.5cm, by transmission bracket 1 as the carriage transmission, being pulled device 7 successively sends into preheating heating in medium frequency stove 2 and ultrasonic frequency process furnace 3 and carries out the sectional type heating, be heated to 950 ℃, then by tubular quenching device 4 carry out for the time 10 second rapid quenching, then be heated to 520 ℃ of tempering through tempering heating in medium frequency stove 5, arrive normal temperature by refrigerating unit 6 cooling process at last, so just, producing yield strength is the high strength shaped steel 8 (angle steel) of 720MPa, and its inside metallographic is that grain fineness number reaches 9 grades sorbite.
Example 9: process preheating heating in medium frequency stove 2, ultrasonic frequency process furnace 3, tempering heating in medium frequency stove 5 and tubular quenching device 4 by example 1 described method earlier, spray orifice 14 distances on the inwall 12 of this tubular quenching device 4 change 5cm into, and are ready to production line by the requirement of post-treatment method as shown in Figure 1; Simultaneously, press C:0.11%, Si:0.15%, Mn:1.9%% by steel mill; Select three kinds of trace alloying element Ni:0.02%, Nb:0.045%, Cr:0.05% and remaining be the Fe Chemical Composition shaped steel 8 (H shaped steel) that to have smelted steel billet and the good specification of heating rolling be 9.6cm * 10cm, transport it into the following process place again, through towing mechanism 7 tractions, by transmission bracket 1 as the carriage transmission, being pulled device 7 successively sends into preheating heating in medium frequency stove 2 and ultrasonic frequency process furnace 3 and carries out the sectional type heating, be heated to 860 ℃, then by tubular quenching device 4 carry out for the time 10 seconds rapid quenching, then be heated to 650 ℃ of tempering through tempering heating in medium frequency stove 5, arrive normal temperature by refrigerating unit 6 cooling process at last, so just, producing yield strength is the superstrength shaped steel 8 (H shaped steel) of 610MPa, and its inside metallographic is that grain fineness number reaches 9 grades sorbite.
Example 10: process preheating heating in medium frequency stove 2, ultrasonic frequency process furnace 3, tempering heating in medium frequency stove 5 and tubular quenching device 4 by example 1 described method earlier, spray orifice 14 distances on the inwall 12 of this tubular quenching device 4 change 3cm into, and are ready to production line by the requirement of post-treatment method as shown in Figure 1; Simultaneously, press C:0.25%, Si:0.80%, Mn:1.2% by steel mill; Select three kinds of trace alloying element Ni:0.1%, Cr:0.25%, Ti:0.045% and remaining be the Fe Chemical Composition shaped steel 8 (H shaped steel) that to have smelted steel billet and the good specification of heating rolling be 44cm * 30cm, transport it into the following process place again, through towing mechanism 7 tractions, by transmission bracket 1 as the carriage transmission, being pulled device 7 successively sends into preheating heating in medium frequency stove 2 and ultrasonic frequency process furnace 3 and carries out the sectional type heating, be heated to 930 ℃, then by tubular quenching device 4 carry out for the time 30 seconds rapid quenching, then be heated to 500 ℃ of tempering through tempering heating in medium frequency stove 5, arrive normal temperature by refrigerating unit 6 cooling process at last, so just, producing yield strength is the superstrength shaped steel 8 (H shaped steel) of 1200MPa, and its inside metallographic is that grain fineness number reaches 9 grades sorbite.
Example 11: process preheating heating in medium frequency stove 2, ultrasonic frequency process furnace 3, tempering heating in medium frequency stove 5 and tubular quenching device 4 by example 1 described method earlier, spray orifice 14 distances on the inwall 12 of this tubular quenching device 4 change 1cm into, and are ready to production line by the requirement of post-treatment method as shown in Figure 1; Simultaneously, press C:0.45%, Si:1.9%, Mn:0.25% by steel mill; Select four kinds of trace alloying element Ni:0.2%, Nb:0.7%, Cr:0.5%, V:0.035% and remaining be the Fe Chemical Composition shaped steel 8 (H shaped steel) that to have smelted steel billet and the good specification of heating rolling be 89cm * 30cm, transport it into the following process place again, through towing mechanism 7 tractions, by transmission bracket 1 as the carriage transmission, being pulled device 7 successively sends into preheating heating in medium frequency stove 2 and ultrasonic frequency process furnace 3 and carries out the sectional type heating, be heated to 1100 ℃, then by tubular quenching device 4 carry out for the time 60 seconds rapid quenching, then be heated to 370 ℃ of tempering through tempering heating in medium frequency stove 5, arrive normal temperature by refrigerating unit 6 cooling process at last, so just, producing yield strength is the superstrength shaped steel 8 (H shaped steel) of 1660MPa, and its inside metallographic is that grain fineness number reaches 9 grades sorbite.
Example 12: process preheating heating in medium frequency stove 2, ultrasonic frequency process furnace 3, tempering heating in medium frequency stove 5 and tubular quenching device 4 by example 1 described method earlier, spray orifice 14 distances on the inwall 12 of this tubular quenching device 4 change 5cm into, and are ready to production line by the requirement of post-treatment method as shown in Figure 1; Simultaneously, with specification is common shaped steel 8 (H shaped steel) process towing mechanism 7 tractions of 9.6cm * 10cm, by transmission bracket 1 as the carriage transmission, being pulled device 7 successively sends into preheating heating in medium frequency stove 2 and ultrasonic frequency process furnace 3 and carries out the sectional type heating, be heated to 900 ℃, then by tubular quenching device 4 carry out for the time 10 seconds rapid quenching, then be heated to 550 ℃ of tempering through tempering heating in medium frequency stove 5, arrive normal temperature by refrigerating unit 6 cooling process at last, so just, producing yield strength is the superstrength shaped steel 8 (H shaped steel) of 650MPa, and its inside metallographic is that grain fineness number reaches 9 grades sorbite.
Claims (4)
1. the working method of high strength and superstrength shaped steel, it is characterized in that, press Chemical Composition C:0.11～0.5%, Si:0.1～1.9%, Mn:0.1～1.9%, select following one or more trace elements: Ni:0.02～0.2%, Nb:0.02～0.8%, Cr:0.02～0.8%, Ti:0.02～0.6% is smelted into steel billet with V:0.01～0.1% and remainder for Fe, and heating rolling becomes shaped steel, high strength shaped steel also can adopt existing common shaped steel, use the towing mechanism transmission, send preheating heating in medium frequency stove (2) successively to and ultrasonic frequency process furnace (3) is heated to 850～1100 ℃, then carry out the rapid quenching in 3～60 seconds through tubular quenching device (4), pass through tempering heating in medium frequency stove (5) again and be heated to 370～720 ℃ of tempering, after refrigerating unit (6) cooling process process to normal temperature.
2. according to the working method of described a kind of high strength of claim 1 and superstrength shaped steel, it is characterized in that, in the preheating heating in medium frequency stove (2) of described use, ultrasonic frequency process furnace (3) and the tempering heating in medium frequency stove (5) ruhmkorff coil (9) is arranged respectively, can put into shaped steel (8) in the middle of this ruhmkorff coil (9), its profile and shaped steel (8) are complementary and keep certain interval.
3. according to the working method of described a kind of high strength of claim 1 and superstrength shaped steel, it is characterized in that, the tubular quenching device (4) of described use is made up of inwall (12) and outer wall (11), tube end (10) sealing, inwall (12) and outer wall (11) hollow between the two are storage chamber (3), in length and breadth to being provided with spray orifice (14) apart from 1～5cm respectively, outer wall (11) is provided with high-pressure nozzle joint (15) on the inwall (12).
4. according to the working method of described a kind of high strength of claim 1 and superstrength shaped steel, it is characterized in that, use chemical composition formula to smelt the shaped steel institute product processed yield strength 〉=600～1670MPa of hot rolling of steel billet, use common shaped steel institute product processed yield strength 〉=600～900MPa, metallographic structure is tempering troostite or sorbite, and grain fineness number all reaches more than 9 grades.
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| CN102181798A (en) * | 2011-04-07 | 2011-09-14 | 江苏天舜金属材料集团有限公司 | Processing method of high yield ratio and high plasticity steel product for prestressed concrete |
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| CN102181797B (en) * | 2011-04-07 | 2012-07-25 | 江苏天舜金属材料集团有限公司 | Method for processing steel strand for prestressed concrete |
| CN102943214A (en) * | 2012-11-16 | 2013-02-27 | 武汉钢铁(集团)公司 | Automotive cold-rolled diaphragm spring steel and production method thereof |
| CN102943214B (en) * | 2012-11-16 | 2014-10-08 | 武汉钢铁(集团)公司 | Automotive cold-rolled diaphragm spring steel and production method thereof |
| CN103173686A (en) * | 2013-03-07 | 2013-06-26 | 上海大学 | Troostite pre-hardened plastic die steel and its preparation method |
| CN103334051A (en) * | 2013-07-04 | 2013-10-02 | 莱芜钢铁集团有限公司 | Hot rolling H-shape steel with Z-direction property for building and production method thereof |
| CN103334051B (en) * | 2013-07-04 | 2015-11-04 | 莱芜钢铁集团有限公司 | A kind of for building hot rolled H-shaped and production method with Z-direction performance |
| CN104088891A (en) * | 2014-06-29 | 2014-10-08 | 奉化市飞天人精密模具设计有限公司 | Automobile connection rod and thermal treatment process thereof |
| CN114107611A (en) * | 2021-11-23 | 2022-03-01 | 钢铁研究总院 | Cooling method of H-shaped steel |
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Application publication date: 20110112 |