CN104264052A - Steel plate for engineering machinery and production method of steel plate - Google Patents
Steel plate for engineering machinery and production method of steel plate Download PDFInfo
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Abstract
The invention discloses a steel plate for engineering machinery and a production method of the steel plate. The steel plate comprises the following chemical constituents by mass percent: 0.05-0.09% of C, 0.05-0.30% of Si, 1.5-2.0% of Mn, 0-0.025% of P, 0-0.005% of S, 0-0.07% of Nb, 0.08-0.15% of Ti, 0.10-0.30% of Mo, 0.015-0.06% of Als, 0.0010-0.0030% of Ca, 0-0.006% of N, and the balance of Fe. The steel plate is 3.0-8.5 mm in thickness. The steel plate disclosed by the invention is produced by advanced ultra fast cooling equipment and a 2250-mm wide flat steel thermal treatment line, which is unique at home, high in surplus of strength and ductility, excellent in impact toughness, low in postwelding strength loss rate, particularly low in anisotropism and unevenness, excellent in bending performance, and suitable for manufacturing the suspension arm for a crane and other engineering machinery and vehicles.
Description
Technical field
The present invention relates to high-strength high-toughness steel plate and production method thereof that a kind of yield strength is 700MPa level, particularly relate to a kind of for engineering machinery arm steel plate and production methods thereof such as lifting machines.
Background technology
Light-weight design has been widely used in Space Science and Technology, automobile, electronic industry, but engineering machinery vehicle field at home, especially for crane, this field still belongs to the starting stage.Realize crane core component-arm-lightweight, significantly can reduce the working load of lifting machine, improve rated output, realize the leap of equipment performance.Use the high-strength high-toughness steel plate with excellent mechanical performances and use properties, the weight of crane arm can be alleviated well, realize light-weighted target.
The main technical requirements being 700MPa level crane arm steel for high-level large-tonnage yield strength comprises: (1) steel plate thickness specification is mainly at 4 ~ 8mm; (2) mechanical property: yield strength (Rel/Rp0.2) >=700MPa, tensile strength (Rm) >=785MPa, elongation after fracture (A) >=15% ,-20 DEG C of ballistic work (Akv) >=40J, 2 times of bending moments bending 180 ° qualified; (3) plate shape requires: planeness need control at below 3mm/m, otherwise after die mould, arm part easily occurs that U-type groove both sides are not contour, asymmetric, and lower arch such as to upwarp at the defect; (4) steel plate use properties: welding property good (lap joint CTS welding crack rate≤3%, as deposited strength >=750MPa), buckling performance superior (without specific targets, the current domestic steel plate once rate of being up to the standards is 60 ~ 70%).
Based on the reason of crane arm by steel thickness specification, steel plate is nearly all produced by conventional hot continuous rolling machine production line.Production technology comprises TMCP(controlled rolling and controlled cooling) and modified (quenching+tempering) two kinds, wherein TMCP technology is because operation is shorter, production cost is relatively low, delivery cycle is short, be almost all roll bending manufacturing firms adopted, the only FA steel mill of minority technology, adopt the modified mode of rolling rear press quenching+tempering to produce this kind of crane arm 700MPa level steel, representative products has the WELDOX 700 of SSAB company of Sweden.
Application number be 200910083635.1 patent application propose a kind of production method of high-strength steel with yield strength of 700 MPa.Production method in this patent, because continuous casting and rolling slab thickness is generally 60 ~ 90mm, the total reduction of milling train is little, and uses the section cooling that cooling rate is not high, and these factors make the surplus capacity of product performance little, and especially impelling strength is easily on the low side.In addition, patent application for product be hot rolled coil.
Application number be 201110366129.0 patent application propose hot rolling titaniferous High Strength Steel Plate and the manufacture method thereof that a kind of yield strength is greater than 700 MPa levels.This type of steel mainly relies on the precipitation strength of high Ti content to improve intensity, and because Ti is more active, be easily oxidized in smelting molten steel process, and be combined with N, S and lose its effect that super-refinement is separated out in ferrite, therefore intensity relative fluctuation is large.And Ti content is higher, its low-temperature impact toughness declines comparatively obvious, easily occurs the underproof situation of ballistic work.3rd, this patent application for product be hot rolled coil.
Application number be 201010101815.0 patent application propose a kind of low cost yield strength 700MPa level Micro Alloying process High Strength Steel Plate and manufacture method thereof, this type of steel adopts the Composition Design of low C-Si-Mn-Nb-Ti-Cr, uses Cr and do not use Mo as hardening capacity element in composition.Use Mo and Cr to compare, the carbide stability that both are formed has significant difference, uses the temper resistance of Mo very high, can not bring obvious strength degradation, and therefore, these type of 700 MPa steel adding Cr are more suitable for hot-rolled state delivery.In addition, product described in this patent is also hot rolled coil.
Application number be 201110343384.3 patent application propose a kind of 750MPa ~ 880MPa level vehicle high-strength steel and production method thereof, its patent application for be hot rolled coil product.
Application number be 201010186720.3 patent application propose a kind of economic high-strength steel plate with yield strength of 690 MPa and manufacture method thereof, application number be 201210209649.5 patent application propose and a kind of surrender 700MPa level high-strength steel and manufacture method thereof without nickel high tenacity, application number be 201310269680.2 patent application propose a kind of tension 800MPa level hydropower station pressure pipeline High Strength Steel Plate and production method.Plate of moderate thickness product is involved by aforementioned three patent applications.
Prior art Problems existing is: more steel enterprise is limited by the restriction of cooling apparatus, and roller repairing speed is slow, make intensity and low-temperature impact work value surplus capacity little.In addition, other steel mill domestic is because lacking wide steel strip heat-treatment production line, the crosscut plate after the crosscut plate of hot rolled coil or hot rolled coil slow cooling self-tempering or the crosscut plate after hot rolled coil bell-type annealing is all adopted to deliver goods, opening the steel plate internal stress after putting down eliminates not thorough, plate shape planeness is not high, so that the arm die mould that impact is follow-up.
Summary of the invention
A kind of yield strength being applicable to lifting machine lightweight requirements is the object of the present invention is to provide to be the steel for engineering machinery of 700MPa level (especially crane arm steel) and production method thereof.
For achieving the above object, the technical solution used in the present invention is:
Described a kind of yield strength is the quality plate of 700MPa level, its chemical composition (mass percentage) is: C 0.05 ~ 0.09, Si 0.05 ~ 0.30, Mn 1.5 ~ 2.0, P≤0.025, S≤0.005, Nb 0 ~ 0.07, Ti 0.08 ~ 0.15, Mo 0.10 ~ 0.30, Als 0.015 ~ 0.06, Ca 0.0010 ~ 0.0030, N≤0.006, surplus is Fe, and steel plate thickness is 3.0mm ~ 8.5mm.
The production method of described a kind of steel for engineering machinery plate, comprises following processing step:
Converter or electrosmelting → LF+RH refining → continuous casting → process furnace heating → roughing → finish rolling → ultrafast is cold → and section cooling → batch → cross section is flat → tempering heat treatment, processing parameter is as follows:
(1) continuous casting steel billet adopts hot-loading and hot-conveying technique, ensures that charging temperature when slab enters process furnace is more than 300 DEG C, slab heating temperature more than 1200 DEG C.
(2) hot rolling finishing temperature controls at 820 ~ 880 DEG C.
(3) cooling facility for laminar flow rolling fast cooling device or encryption that rear employing cooling rate is greater than 25 DEG C/s cools.
(4) oiler temperature control is at 560 ~ 640 DEG C.
(5) steel plate is after opening gentle crosscut, carries out that temperature is 550 ~ 650 DEG C, the time is the tempering of 10 ~ 50min at heat-treatment lines.
Adopt a kind of steel for engineering machinery plate as technique scheme provides and production method thereof, compared with prior art, technique effect is:
(1) wind off Heisei hot rolling crosscut plate by hot rolling, then unique at home 2250mm wide steel strip heat-treatment lines carries out tempering heat treatment.
(2) mechanical property of steel plate to meet in GB/T 20887.1 mechanical property requirements of S700MC in Q690D, EN 10149-2 in HR700F, GB/T 16270, performance requriements is: yield strength is greater than 700MPa, tensile strength is greater than 785MPa,-20 DEG C of ballistic works are greater than 40J, unit elongation is greater than 15%, cold-bending property meet 2 times of moments of flexure bending 180 ° qualified.
(3) except meeting the technical requirements of existing yield strength 700MPa level steel for engineering machinery, its mechanical property surplus capacity foot, it is low that postwelding loses strong rate, especially because steel plate property anisotropy is little, planeness is high, buckling performance is superior, lifting machine manufacturer is made to improve the utilization ratio of steel plate, decrease arm part fire school, strike the links such as school, improve production efficiency.The performance index of steel of the present invention are concrete as yield strength >=800MPa, tensile strength >=850MPa, unit elongation >=18% ,-20 DEG C of ballistic work >=80J, clod wash 2 times of bending moments 180 ° are bending qualified, steel plate roughness≤2mm/m, strong rate < 10% is lost in welding, and respectively little to performance difference, steel plate internal stress is little, buckling performance is once up to the standards rate > 90%, exceeds about 30% than other producer's product.
(4) steel of the present invention is also applicable to other parts of engineering machinery vehicle, as truck mounted concrete pump arm, truck mounted concrete pump vehicle body, and the positions such as crane vehicle body, base plate.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is further described.
Described steel plate, its chemical composition mass percentage is: C 0.05 ~ 0.09, Si 0.05 ~ 0.30, Mn 1.5 ~ 2.0, P≤0.025, S≤0.005, Nb 0 ~ 0.07, Ti 0.08 ~ 0.15, Mo 0.10 ~ 0.30, Als 0.015 ~ 0.06, Ca 0.0010 ~ 0.0030, N≤0.006, surplus is Fe, and the thickness of steel plate is 3.0mm ~ 8.5mm.
Described steel plate adopts the Composition Design of low C, high Mn, middle Nb, high Ti, low Mo, send by steel slab heat quality problems such as guaranteeing that slab not crack initiation is not ruptured.The organization type of steel plate tempering state of the present invention is polygonal ferrite+a small amount of cementite tissue.By hot-rolled steel sheet tempering, play the precipitation hardening effect of Ti, Nb, Mo element on the one hand further, to improve intensity, on the other hand, steel plate tempering can eliminate internal stress, ensures plate shape, thus meets the high request of crane arm to buckling performance.In composition, each element Main Function is as follows: (1) C: low carbon content, and reduce carbon equivalent to improve the welding property of steel plate, meanwhile, appropriate C and Ti, Nb, Mo form stable MC two-phase precipitate, increase substantially intensity; (2) Si: solution strengthening element, for as the component needing coating, for improving coating performance, Si content can by lower limit, as 0.06% controls, for the component be used as without coating requirement, Si content can suitably increase, but is less than 0.3% as far as possible, forms more SiO to prevent top layer
2product; (3) Mn: solution strengthening improves intensity, and in addition, high Mn content can improve non-recrystallization temperature during hot rolling, and the austenite flattening making full use of finish rolling section carrys out crystal grain thinning; (4) S: as far as possible control to below 50ppm, thus improve the ratio of effective Ti in full Ti; (5) P: be grain boundary segregation element, the low-temperature impact toughness of steel plate can be reduced, but P content is little lower than impacting Toughness for this hot rolling and tempering state steel plate during 0.02wt.%; (6) Ti; Strong precipitation strength element, can form TiC super-refinement nano-scaled precipitate with C, separate out, increase substantially intensity in ferrite; (7) Nb: important crystal grain thinning element, plays certain precipitating reinforcing effect in addition; (8) Mo: be hardening capacity element on the one hand, promote the formation of quasi-polygonal ferrite, on the other hand, form Second Phase Precipitation thing (Ti, the Mo) C of compound with TiC, during tempering, precipitate can not be grown up rapidly, has good temper resistance.
Described Plate Production method, comprises following processing step:
Converter or electrosmelting → LF+RH refining → continuous casting → process furnace heating → roughing → finish rolling → ultrafast is cold → and section cooling → batch → cross section is flat → tempering heat treatment, processing parameter is as follows:
(1) continuous casting steel billet adopts hot-loading and hot-conveying technique, ensures that charging temperature when slab enters process furnace is more than 300 DEG C, slab heating temperature more than 1200 DEG C.
(2) hot rolling finishing temperature controls at 820 ~ 880 DEG C.
(3) cooling facility for laminar flow rolling fast cooling device or encryption that rear employing cooling rate is greater than 25 DEG C/s cools.
(4) oiler temperature control is at 560 ~ 640 DEG C.
(5) steel plate is after opening gentle crosscut, carries out that temperature is 550 ~ 650 DEG C, the time is the tempering of 10 ~ 50min at heat-treatment lines.
embodiment 1
To smelt in 210 tons of converters and molten steel through LF stove and the refining of RH stove pours into strand at slab caster, its chemical composition mass percentage is: C 0.076, Si 0.21, Mn 1.81, P 0.011, S 0.0017, Als 0.032, Ca 0.0005, Nb 0.060, Ti 0.101, Mo 0.19, and all the other are Fe and inevitable impurity.
Slab thickness is 230 mm, be rolled at 2250 conventional hot continuous rolling machine production lines, Heating temperature is 1240 DEG C, entry temperature at finishing is 1060 DEG C, workpiece thickness is 46mm, and finishing temperature is 850 DEG C, and target thickness is 4mm, be cooled to target coiling temperature 600 DEG C through ultrafast cold-peace ACC layer is cold after rolling, coil of strip batches rear air cooling.Coil of strip, lower than after 60 DEG C, can carry out out at traverse flat, open plain plate and carry out 650 DEG C × 25min tempering one by one at wide steel strip heat-treatment lines by steel roll temperature.
According to the high-strength steel with yield strength of 700 MPa that above method is produced, steel plate flatness can ensure at below 2mm/m.Steel plate is from top layer to center, and grain-size is extremely tiny, and size is very even, and average grain size is 3-5 μm, and microstructure type is quasi-polygonal ferrite+a small amount of cementite.The mechanical performance compare of described steel plate and hot rolling raw material plate and the identical grade of steel product of other patent is in table 1.
table 1 example 1 mechanical property and with the comparing of other steel
As can be seen from Table 1, this patent tempered steel is compared with other steel of same intensity rank, and yield strength at least exceeds 75MPa, and tensile strength at least exceeds 51MPa, and plasticity index is not worse than other steel.In addition, horizontal, longitudinal mechanical property difference is less than its hot rolling raw steel, steel plate respectively to performance evenly, more stable.
embodiment 2
To smelt in 210 tons of converters and molten steel through LF stove and the refining of RH stove pours into strand at slab caster, its chemical composition mass percentage is: C 0.073, Si 0.26, Mn 1.82, P 0.012, S 0.0029, Als 0.029, Ca 0.0005, Nb 0.063, Ti 0.116, Mo 0.18, and all the other are Fe and inevitable impurity.
Slab thickness is 230 mm, be rolled at 2250 conventional hot continuous rolling machine production lines, Heating temperature is 1240 DEG C, entry temperature at finishing is 1030 DEG C, workpiece thickness is 51mm, and finishing temperature is 850 DEG C, and target thickness is 6mm, be cooled to target coiling temperature 600 DEG C through ultrafast cold-peace ACC layer is cold after rolling, coil of strip batches rear air cooling.Coil of strip, lower than after 60 DEG C, can carry out out at traverse flat, open plain plate and carry out 650 DEG C × 25min tempering one by one at thin plate heat-treatment lines by steel roll temperature.
According to the high-strength steel with yield strength of 700 MPa that above method is produced, steel plate flatness can ensure at below 2mm/m.Steel plate average grain size is 4-6 μm, and size is very even, and microstructure type is quasi-polygonal ferrite+a small amount of cementite.The mechanical performance compare of described steel plate and hot rolling raw material plate and the identical grade of steel product of other patent is in table 2.
table 2 example 2 mechanical property and with the comparing of other steel
As can be seen from Table 2, tempering steel plate is compared with other steel of same intensity rank, and yield strength at least exceeds 45MPa, and tensile strength at least exceeds 20MPa, and plasticity index and impelling strength are not worse than other steel.In addition, horizontal, longitudinal performance difference is less than its hot rolling raw steel, steel plate respectively to performance evenly, more stable.
embodiment 3
To smelt in 210 tons of converters and molten steel through LF stove and the refining of RH stove pours into strand at slab caster, its mass percentage is: C 0.068, Si 0. 0.21, Mn 1.87, P 0.013, S 0.0022, Als 0.034, Ca 0.0008, Nb 0.061, Ti 0.109, Mo 0.19, and all the other are Fe and inevitable impurity.
Slab thickness is 230 mm, be rolled at 2250 conventional hot continuous rolling machine production lines, Heating temperature is 1240 DEG C, entry temperature at finishing is 1030 DEG C, workpiece thickness is 54mm, and finishing temperature is 840 DEG C, and target thickness is 8mm, be cooled to target coiling temperature 580 DEG C through ultrafast cold-peace ACC layer is cold after rolling, coil of strip batches rear air cooling.Coil of strip, lower than after 60 DEG C, carries out out at traverse flat, opens plain plate and carry out 650 DEG C × 30min tempering one by one at thin plate heat-treatment lines by steel roll temperature.
According to the high-strength steel with yield strength of 700 MPa that above method is produced, steel plate flatness can ensure at below 2mm/m.Steel plate average grain size is 4-6 μm, and size is very even, and microstructure type is quasi-polygonal ferrite+a small amount of cementite.The mechanical performance compare of described steel plate and hot rolling raw material plate and the identical grade of steel product of other patent is in table 3.
table 3 example 3 mechanical property and with the comparing of other steel
As can be seen from Table 3, tempering steel plate is compared with other steel of same intensity rank, and yield strength at least exceeds 77MPa, and tensile strength at least exceeds 69MPa, and plasticity is suitable with other steel with toughness overall target.In addition, horizontal, longitudinal performance difference is less than its hot rolling raw steel, steel plate respectively to performance evenly, more stable.
Claims (2)
1. a steel for engineering machinery plate, is characterized in that: chemical composition mass percentage is, C 0.05 ~ 0.09, Si 0.05 ~ 0.30, Mn 1.5 ~ 2.0, P≤0.025, S≤0.005, Nb 0 ~ 0.07, Ti 0.08 ~ 0.15, Mo 0.10 ~ 0.30, Als 0.015 ~ 0.06, Ca 0.0010 ~ 0.0030, N≤0.006, surplus is Fe; Steel plate thickness controls at 3.0mm ~ 8.5mm.
2. implement the claims the production method of the steel for engineering machinery plate described in 1, it is characterized in that:
(1) continuous casting steel billet adopts hot-loading and hot-conveying technique, and charging temperature when slab enters process furnace is greater than 300 DEG C, and slab heating temperature is greater than 1200 DEG C;
(2) hot rolling finishing temperature controls at 820 ~ 880 DEG C;
(3) roll the cooling rate that rear employing cooling rate is greater than 25 DEG C/s to cool band steel;
(4) oiler temperature control is at 560 ~ 640 DEG C;
(5) steel plate is after opening gentle crosscut, carries out 550 ~ 650 DEG C/10 ~ 50min tempering at heat-treatment lines.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105838973A (en) * | 2016-03-28 | 2016-08-10 | 黄惠玲 | High-strength steel plate and preparation process thereof |
| CN106929759A (en) * | 2017-03-17 | 2017-07-07 | 唐山钢铁集团有限责任公司 | A kind of 800MPa grades of Thin Specs hot rolled strip and its production method |
| CN107513662A (en) * | 2017-09-08 | 2017-12-26 | 河钢股份有限公司邯郸分公司 | Save the production method of cold forming high intensity steel S700MC low strengths |
| CN108486464A (en) * | 2018-03-30 | 2018-09-04 | 湖南华菱涟源钢铁有限公司 | 900MPa grades of ferrite base tempering steel plates of yield strength and production method |
| CN111440991A (en) * | 2020-04-07 | 2020-07-24 | 湖南华菱涟源钢铁有限公司 | Hot rolled steel plate with yield strength of 800MPa and manufacturing method thereof |
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| JP2009019265A (en) * | 2007-06-12 | 2009-01-29 | Nippon Steel Corp | High young's modulus steel sheet excellent in hole expansion property and its production method |
| JP2011246971A (en) * | 2010-05-27 | 2011-12-08 | Nippon Steel Corp | Electric-resistance-welded pipe for brace with superior buckling resistance, and its production method |
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| JP2009019265A (en) * | 2007-06-12 | 2009-01-29 | Nippon Steel Corp | High young's modulus steel sheet excellent in hole expansion property and its production method |
| JP2009013478A (en) * | 2007-07-05 | 2009-01-22 | Nippon Steel Corp | High-rigidity and high-strength cold-rolled steel sheet and manufacturing method therefor |
| JP2011246971A (en) * | 2010-05-27 | 2011-12-08 | Nippon Steel Corp | Electric-resistance-welded pipe for brace with superior buckling resistance, and its production method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105838973A (en) * | 2016-03-28 | 2016-08-10 | 黄惠玲 | High-strength steel plate and preparation process thereof |
| CN106929759A (en) * | 2017-03-17 | 2017-07-07 | 唐山钢铁集团有限责任公司 | A kind of 800MPa grades of Thin Specs hot rolled strip and its production method |
| CN107513662A (en) * | 2017-09-08 | 2017-12-26 | 河钢股份有限公司邯郸分公司 | Save the production method of cold forming high intensity steel S700MC low strengths |
| CN108486464A (en) * | 2018-03-30 | 2018-09-04 | 湖南华菱涟源钢铁有限公司 | 900MPa grades of ferrite base tempering steel plates of yield strength and production method |
| CN111440991A (en) * | 2020-04-07 | 2020-07-24 | 湖南华菱涟源钢铁有限公司 | Hot rolled steel plate with yield strength of 800MPa and manufacturing method thereof |
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| CN104264052B (en) | 2016-08-31 |
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