CN101899616B - Steel for 600MPa-grade high-strength engineering machines and production method thereof - Google Patents
Steel for 600MPa-grade high-strength engineering machines and production method thereof Download PDFInfo
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- CN101899616B CN101899616B CN2010102371366A CN201010237136A CN101899616B CN 101899616 B CN101899616 B CN 101899616B CN 2010102371366 A CN2010102371366 A CN 2010102371366A CN 201010237136 A CN201010237136 A CN 201010237136A CN 101899616 B CN101899616 B CN 101899616B
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Abstract
The invention relates to steel for 600MPa-grade high-strength engineering machines and a production method thereof, belonging to the technical field of steel for the engineering machines. The steel comprises the following chemical components by weight percent: C: 0.06-0.09%, Si: 0.15-0.25%, Mn: 1.4-1.6%, P: not more than 0.020%, S: not more than 0.010%, Alt: 0.020-0.060%, Nb: 0.040-0.060%, Ti: 0.09-0.12% and the balance of Fe and inevitable impurities. The steel has no expensive elements such as Mo, V and the like, 2 frames are adopted for rough rolling, and 6 frames are used for finish rolling, thereby carrying out controlled rolling; and 20-group laminar cooling is used for strictly controlling the cooling, and internal stress is eliminated by adopting a temperature-holding pit for slowcooling after being offline, thereby being capable of stably producing a hot rolled coil with excellent toughness and low cost, which has the thickness being 5-16mm, the yield strength being more than 600MPa, the V type Charpy impact energy at -20 DEG C being not less than 40J and is applicable to the field of the engineering machines and the like.
Description
Technical field
The invention belongs to engineering machinery and use the steel technical field, particularly relate to a kind of 600MPa grade high-strength engineering machines with steel and working method thereof.
Background technology
It is to serve as the HSLA of microalloy elements such as basis adding Mo, Nb, V, Ti with the C-Mn steel that high-strength engineering machines uses steel.At present, high tensile steel plate is used widely at construction machinery industry and coal mine machinery industry, and demand thickness is main with 4-80mm; Wherein, The following thickness steel plate of 20mm is mainly coiled sheet and opens flat series products, and the overwhelming majority is applied to construction machinery industry, is used to make crane arm, vehicle frame etc.; The above thickness steel plate of 20mm is mainly the plate series products, and majority is applied to the coal mine machinery industry.Because hot-rolled sheet coil does not have the such strong control of plate to control cold means; Often need add more alloying elements, improve cost, and coiled sheet in use need be opened flat; Unrelieved stress is very big to the influence of plate shape; Influence in order to reduce or to eliminate unrelieved stress, in process of production smooth alignings and the thermal treatment process of adopting of coiled sheet have also increased cost more.Domestic have only several families such as Baosteel, Anshan iron and steel plant, Wuhan Iron and Steel Plant to produce 600 grades of High Strength Steel Plates, adds precious metals such as Mo, V mostly, and the controlled rolling and controlled cooling heat treated is produced, and its complex procedures, cost are higher.
Summary of the invention
The purpose of this invention is to provide a kind of 600MPa grade high-strength engineering machines with steel and working method thereof; Need not to add expensive elements such as Mo, V, adopt the technology of dynamically gently depressing, effectively control center's segregation and center porosity; Make it have the high-intensity high toughness that keeps simultaneously; And adopt the method for going into the holding pit slow cooling after rolling to eliminate unrelieved stress, and to produce the high-strength engineering machines of ys more than 600MPa and use steel hot-rolled sheet coil, hot-rolled sheet coil is at-20 ℃ of V-type Charpy-V impact power >=40J.
The object of the invention can be realized through following measure:
The present invention relates to a kind of 600MPa level high-strength engineering machines uses the chemical ingredients of steel hot-rolled sheet coil to be C:0.06-0.09%, Si:0.15-0.25%, Mn:1.4-1.6%, P by weight percentage: S≤0.020% :≤0.010%, Alt:0.020-0.060%, Nb:0.040-0.060%, Ti:0.09-0.12%, surplus is Fe and unavoidable impurities.
600MPa level high-strength engineering machines of the present invention need not to add expensive elements such as Mo, V with steel hot-rolled sheet coil, only compound interpolation Nb, Ti microalloy element on C-Mn base steel plinth, Nb+Ti≤0.18%.
Produce the working method of 600Mpa level high-strength engineering machines, comprise smelting, rolling, it is characterized in that with steel hot-rolled sheet coil:
(1) smelt employing full guard pouring technology, promptly ladle adopts long nozzle to add the argon envelope to the tundish protection, utilizes sealring and argon to seal and prevents that air from infiltrating; Tundish adopts the connection of SEN to add the argon envelope to the beam protection of mold, P≤0.020%, S≤0.010%, [the o]≤20ppm of control strand, [N]≤30ppm.Adopt and dynamically gently to depress technology, effectively control center's segregation and center porosity guarantee that coiled sheet keeps high toughness simultaneously high-intensity.
(2) adopt two frame roughing and six frame finish rolling mode of manufacture, rough rolling step adopts six passages rolling, and the finish rolling stage is adopted six passage finish rolling, and draught 65%～70% in austenite non-recrystallization district, and finishing temperature is controlled at 820～860 ℃.
(3) adopt front end laminar flow cooling mode, be as cold as target temperature soon after going out finish rolling, coiling temperature is controlled in 550～600 ℃ of scopes, and speed of cooling is controlled at 5～10 ℃/s.
(4) batch and carried out slow cooling with the interior holding pit of putting in back 30 minutes.
The present invention compares prior art and has the following advantages:
Mainly be employed on Nb, the Ti basis alloying elements such as adding a certain amount of Mo, V at present both at home and abroad, adopt and roll the modified mode in back and heat-treat and produce 600MPa level high-strength engineering machines and use steel hot-rolled sheet coil.Use great advantage of the present invention and be and need not to add alloying elements such as expensive Mo, V and can produce cheaply 600MPa level high-strength engineering machines and use steel hot-rolled sheet coil; And eliminate unrelieved stress through coiled sheet slow cooling mode; Reduce the plate shape fraction defective of opening after putting down, need not smooth aligning and other heat treatment mode.Use the lumber recovery that the present invention can reduce cost, simplify Production Flow Chart greatly, improve opening plate, energy-saving and cost-reducing, be specially:
1, the present invention is route with the low cost, need not to add expensive elements such as Mo, V, only compound interpolation Nb, Ti microalloy element on C-Mn base steel plinth, and Nb+Ti≤0.18%, cost of alloy is saved about 210 yuan than domestic prior art.
2, adopt the full guard pouring technology, P≤0.020%, S≤0.010%, [the o]≤20ppm of control strand, [N]≤30ppm.Adopt and dynamically gently to depress technology, effectively control center's segregation and center porosity guarantee that coiled sheet keeps high toughness simultaneously high-intensity.
3, the present invention adopts six frame finish rolling, than seven frame finish rolling, can obtain bigger compression ratio; Especially draught impels separating out of microalloy element carbonitride greater than 65% in austenite non-recrystallization district, increases lattice defects such as non-recrystallization austenite grain boundary, deformed belt and dislocation; To increase effective grain boundary area; Improve the ferritic nucleation rate, thereby ferrite crystal grain after the refinement phase transformation obtains better refined crystalline strengthening effect.Refined crystalline strengthening is unique reinforcement means that can obtain HS and H.T., can reduce cost in the use that reduces expensive elements such as Mo, V like this.
4, the present invention puts into the holding pit slow cooling rapidly to eliminate unrelieved stress after coiled sheet rolls off the production line, and need not smooth aligning and other thermal treatment means.Coiled sheet goes out the hole after holding pit nature slow cooling to 100 ℃, fully discharge unrelieved stress.All being controlled in the 5mm, satisfy the requirement of engineering machinery with steel to opening plate volume back transverse and longitudinal roughness.
Embodiment
Below in conjunction with instance to 600MPa level high-strength engineering machines with further auspicious the stating of steel hot-rolled sheet coil and working method thereof:
Table 1 has been listed the present invention and has been used to produce the chemical ingredients of low-cost 600Mpa high-strength engineering machines with steel hot-rolled sheet coil.Working method is following: adopt desulfurizing iron, 210t converter smelting, the refining of LF stove at steelworks, make the chemical ingredients in the steel as shown in table 1 after the processing, surplus is Fe and inevitably is mingled with.The molten steel casting that again table 1 is required becomes the slab of 230mmX1300～1800mm section, delivers to hot continuous rolling factory.
Table 1 chemical ingredients of the present invention, wt%
| Sequence number | C | Si | Mn | P | S | Alt | Nb | Ti |
| 1 | 0.08 | 0.19 | 1.48 | 0.012 | 0.0044 | 0.043 | 0.04 | 0.10 |
| 2 | 0.076 | 0.19 | 1.51 | 0.012 | 0.0046 | 0.036 | 0.04 | 0.09 |
Adopt the hot continuous rolling mode of production of controlled rolling and controlled cooling, go into the burial pit slow cooling after coiled sheet batches.The cold significant parameter of control control comprises: two frame roughing and six frame finish rolling mode of manufacture are adopted in (1); Rough rolling step adopts six passages rolling; The finish rolling stage is adopted six passage finish rolling, and draught is greater than 65% in austenite non-recrystallization district, and finishing temperature is controlled at 820～860 ℃; (2) adopt front end laminar flow cooling mode, be as cold as target temperature soon after going out finish rolling, coiling temperature is controlled in 550～600 ℃ of scopes, and speed of cooling is controlled at 5～10 ℃/s; (3) batch and put into holding pit in back 30 minutes and carry out slow cooling.
Low-cost 600MPa level high-strength engineering machines of the present invention is tabulated in 2 with the manufacturing parameter and the test-results of steel hot-rolled sheet coil.From table, can find out ys greater than 600MPa, tensile strength is greater than 700MPa, and unit elongation is greater than 19%, ,-20 ℃ of V-type Charpy-V impact power >=100J.
Table 2 technology controlling and process of the present invention and test-results
Claims (1)
1. a 600Mpa level high-strength engineering machines comprises smelting, rolling with the working method of steel hot-rolled sheet coil, it is characterized in that:
(1) smelts employing full guard pouring technology, P≤0.020%, S≤0.010%, [the o]≤20ppm of control strand, [N]≤30ppm; Casting blank section is 230mmX 1300～1800mm;
(2) rolling employing two frame roughing and six frame finish rolling mode of manufacture, rough rolling step adopts six passages rolling, and the finish rolling stage is adopted six passage finish rolling, and draught 65%～70% in austenite non-recrystallization district, and finishing temperature is controlled at 820～860 ℃;
(3) adopt front end laminar flow cooling mode, be as cold as target temperature soon after going out finish rolling, coiling temperature is controlled in 550～600 ℃ of scopes, and speed of cooling is controlled at 5～10 ℃/s;
(4) batch and carried out slow cooling with the interior holding pit of putting in back 30 minutes;
Described 600MPa grade high-strength engineering machines uses the chemical ingredients of steel to be C:0.06-0.09%, Si:0.15-0.25%, Mn:1.4-1.6%, P by weight percentage: S≤0.020% :≤0.010%, Alt:0.020-0.060%, Nb:0.040-0.060%, Ti:0.09-0.12%, and surplus is Fe and unavoidable impurities;
Described smelting adopts the full guard pouring technology to be meant, ladle adopts long nozzle to add the argon envelope to the tundish protection, utilizes sealring and argon to seal and prevents that air from infiltrating; Tundish adopts the connection of SEN to add the argon envelope to the beam protection of mold.
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| CN2010102371366A CN101899616B (en) | 2010-07-22 | 2010-07-22 | Steel for 600MPa-grade high-strength engineering machines and production method thereof |
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| CN101899616B true CN101899616B (en) | 2012-05-23 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103031419B (en) * | 2012-12-24 | 2015-05-27 | 首钢总公司 | Method for improving performance uniformity of steel roll of Ti microalloyed high strength machinery |
| CN109706387A (en) * | 2018-12-07 | 2019-05-03 | 包头钢铁（集团）有限责任公司 | A kind of yield strength 600MPa grades of steel for engineering machinery bands and preparation method thereof |
| CN111235480A (en) * | 2020-03-17 | 2020-06-05 | 本钢板材股份有限公司 | A kind of preparation method of high-strength steel coil |
| CN114164331A (en) * | 2021-11-24 | 2022-03-11 | 本钢板材股份有限公司 | A method for eliminating internal stress of high-strength steel |
| CN114774655A (en) * | 2022-03-29 | 2022-07-22 | 本钢板材股份有限公司 | A kind of low-cost 600MPa grade hot-rolled pickling plate and preparation method thereof |
| CN115232938A (en) * | 2022-06-30 | 2022-10-25 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of hot-rolled steel strip for 700MPa grade high-strength construction machinery and production method thereof |
| CN115254961A (en) * | 2022-06-30 | 2022-11-01 | 攀钢集团攀枝花钢铁研究院有限公司 | A method for improving the low temperature toughness of thick gauge high strength engineering machinery steel |
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| CN101153371B (en) * | 2006-09-27 | 2010-04-07 | 宝山钢铁股份有限公司 | High-strength cold-formed hot continuous rolled steel plate and method of preparing the same |
| CN101550520A (en) * | 2008-03-31 | 2009-10-07 | 鞍钢股份有限公司 | 600 MPa-level hot-rolled thin steel plate and manufacturing method thereof |
| CN101538680A (en) * | 2009-05-06 | 2009-09-23 | 湖南华菱涟源钢铁有限公司 | A method for producing high-strength steel with a yield strength of 600MPa |
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Effective date of registration: 20140408 Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Beijing Shougang Co., Ltd. Address before: Yangzidian Town, Qian'an City, Hebei province 064404 Patentee before: Hebei Shougang Qian'an Steel Co., Ltd. Patentee before: Capital Iron & Steel General Company |