CN103045965A - Technique for manufacturing steel plate for 600MPa hydropower steel penstock - Google Patents
Technique for manufacturing steel plate for 600MPa hydropower steel penstock Download PDFInfo
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- CN103045965A CN103045965A CN2012105787419A CN201210578741A CN103045965A CN 103045965 A CN103045965 A CN 103045965A CN 2012105787419 A CN2012105787419 A CN 2012105787419A CN 201210578741 A CN201210578741 A CN 201210578741A CN 103045965 A CN103045965 A CN 103045965A
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Abstract
The invention provides a technique for manufacturing a steel plate for a 600MPa hydropower steel penstock. The steel plate comprises the following chemical components in weight percentage: 0.06-0.09% of C, 0.20-0.40% of Si, 1.4-1.6% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.02-0.04% of Nb, 0.20-0.40% of Ni, 0.10-0.30% of Cr, 0.10-0.30% of Mo, 0.03-0.05% of V, 0.01-0.02% of Ti and the balance of Fe and inevitable impurities. Through a low-carbon microalloying design, a thermo-mechanical control process (TMCP) and a tempering process (T), a metallographic structure mainly based on a tempered bainite is ultimately obtained, thus achieving good matching of strength, plasticity, toughness and weldability, reducing the production cost and improving the production efficiency. The steel plate is mainly used for manufacturing the hydropower penstock.
Description
Technical field
The invention belongs to the low alloy steel field, particularly a kind of production technique of 600MPa level hydraulic power pressure steel for steel pipes plate.
Background technology
Water-power steel is mainly used in the manufacturing of the off-set facility such as the diversion penstock, one-level floor, bifurcated pipe, spiral case in the factory dam, requires steel plate to have enough intensity, good plasticity, good toughness and welding property.Along with the numerical value such as the installed capacity in power station and head are increasing, steel plate is had higher requirement---use to have the more steel plate of high strength, better low-temperature flexibility, better welding property, the steel penstock in domestic water power station mainly uses the steel plate of 600MPa level at present, because clear among the GB19189-2011 " pressurized vessel quenched and tempered high tensile strength plate ", this level steel plate adopts hardening and tempering process delivery, so present domestic steel enterprise main employing hardening and tempering process production, such as the WDB620 of Wuyang iron and steel, Anshan iron and steel plant ADB610D etc.
Disclose a kind of " steel in use for soldering pressure pipe in hydraulic power station under large line energy and production method thereof " such as Chinese patent application number numbers 200510019165.4, adopted hardening and tempering process to produce other pressure steel pipe of hydropower station steel of a kind of 500MPa level.
China Patent Publication No. CN1932063A discloses a kind of " high strength and low welding crack sensitivity Plate Steel and production method thereof ", adopt online direct quenching+off-line tempering process to produce the steel plate of tensile strength 〉=610MPa, has production technique simple, the characteristics such as cost is low, weak point is that online direct quenching is higher to the cooling apparatus performance requriements, can not extensively promote.
China Patent Publication No. CN101096738A discloses " low welding crack sensitivity steel plate and production method thereof ", its chemical composition massfraction is: C≤0.07%, Si:0.15～0.40%, Mn:1.00～1.60%, P≤0.015%, S≤0.010%, Cr :≤0.30%, Ni :≤0.50%, Mo≤0.30%, Cu≤0.30%, V :≤0.08%, Nb :≤0.08%, Ti:0.010～0.020%, B≤0.003%, adopt the TMCP+ tempering process to produce the steel plate of tensile strength 〉=610MPa, weak point is to have adopted three stage control rolling technologys, has strengthened rolling load, requires milling train to have larger moment of torsion and rolling load.
Summary of the invention
Problem and deficiency for above existence, the purpose of this invention is to provide a kind of tensile strength greater than 600MPa, have good plasticity, good low-temperature impact toughness and the hydraulic power pressure steel for steel pipes plate of welding property, this steel plate is mainly used in the manufacturing of hydropower station pressure pipeline.
Technical scheme of the present invention is as follows:
The chemical composition of steel plate of the present invention is C:0.06～0.09%, Si:0.20～0.40%, Mn:1.4～1.6%, P by weight percentage :≤0.015%, S :≤0.005%, Nb:0.02～0.04%, Ni:0.20～0.40%, Cr:0.10～0.30%, Mo:0.10～0.30%, V:0.03～0.05%, Ti:0.01～0.02%, surplus are Fe and inevitable impurity.
Preparation method of the present invention, main technologic parameters and principle analysis are as follows
1, smelting and casting
Other alloys that ready low-phosphorous (≤0.015%), low-sulfur (≤0.005%), hypoxemia (≤0.0040%), low nitrogen (≤0.0060%) high-quality steel scrap and calculating are prepared add laboratory 100kg vacuum smelting furnaces, vacuumize rear startup and melt smelting, after melting, be cast in the rectangle punching block, be cast into the rectangle steel billet that is of a size of 250 * 245 * 260mm.
2, heating and rolling:
With mechanical manipulator steel billet is packed in the high temperature resistance furnace.1210 ℃ ~ 1250 ℃ of Heating temperatures, total time inside furnace 〉=270min guarantees that steel billet temperature is even, treats that steel billet reaches when adding heat request, with mechanical manipulator steel billet is sent to φ 750 * 550mm experimental mill.Adopt the two-stage control rolling technology, namely the austenite recrystallization district is rolling rolling with austenite non-recrystallization district.When rolling in the austenite recrystallization district, start rolling temperature is 1200～1230 ℃, and the 1st～2 reduction in pass should be greater than 10%, and next has at least 1～2 percentage pass reduction to be controlled at 20～40%, in order to abundant refinement original austenite grains; When rolling in austenite non-recrystallization district, start rolling temperature≤950 ℃, the accumulation draft is greater than 60%, and purpose is in order to guarantee that it has enough deflections in the non-recrystallization district, more highdensity dislocation accumulative total is arranged, for ferrite transformation provides more favourable forming core condition in the austenite of distortion.Larger distortion also is conducive to the separating out of carboritride of Nb, because the effect that deformation inductdion is separated out, larger pass deformation rate will be conducive to the formation of precipitate and make its more tiny and disperse, simultaneously, tiny and precipitate and pinning effect thereof disperse provide highdensity forming core place and stop it to grow up and alligatoring for ferrite, and this strength and toughness for steel all plays favourable effect.Finishing temperature is controlled at the low-temperature zone in non-recrystallization district, this humidity province is near transformation temperature Ar simultaneously
3, namely finishing temperature is 810～840 ℃.
3, cooling
After controlled rolling finished, steel plate entered and accelerates cooling (Acc) device, and the speed of cooling above by 5～10 ℃/s is cooled to below 600 ℃.Because steel plate has accumulated the very high dislocation of density and high strain energy in the operation of rolling, highdensity dislocation will with precipitate Nb (CN) particle interaction of Nb, finish to air cooling (relaxation) process of accelerating cooling rolling, this interaction impels at the inner in a large number tiny Polygons dislocation cell structures that form of austenite crystal, the Nb atom is separating out on the dislocation cell wall in the segregation on the dislocation wall and a large amount of fine Nb (CN), stablized this Polygons cell structure with certain misorientation.Simultaneously, the moderate finite deformation of a passage has the effect of inducing ferrite transformation, under this inducing action, and Ar
3Point increases, and so-called " strain-induced transformation " phenomenon namely occurs, and finally obtaining bainite is main metallographic structure.
4, tempering heat treatment
Determine that according to experimental result the optimum tempering temperature of steel plate is 610～650 ℃, soaking time is 20min+t * 2.5min/mm, and wherein t is steel plate thickness, and unit is mm.
Beneficial effect of the present invention is:
Abandon traditional off-line hardening and tempering process and transferred to adopt the TMCP+ tempering process, reduced process cost, improved production efficiency.By rational chemical composition design, and take above-mentioned technique can obtain a kind of tensile strength greater than 600MPa, have good plasticity, good low-temperature impact toughness and the hydraulic power pressure steel for steel pipes plate of welding property.
Description of drawings
Fig. 1 is the metallographic structure figure of the embodiment of the invention 1 steel plate.
Embodiment
Below for a more detailed description to the present invention with embodiment.These embodiment only are the descriptions to best mode for carrying out the invention, scope of the present invention are not had any restriction.
Embodiment 1
Press the chemical composition shown in the table 1 and smelt, and be cast into steel ingot, with Heating Steel Ingots to 1232 ℃, total time inside furnace insulation 300 minutes, carry out the fs at experimental mill rolling, namely the austenite recrystallization district is rolling, and start rolling temperature is 1214 ℃, the 1st～2 reduction in pass should be greater than 10%, next has at least 1～2 percentage pass reduction to be controlled at 20～40%, when rolled piece thickness is 60mm, treats that at roller-way temperature is to 900 ℃, carry out subsequently subordinate phase rolling, namely austenite non-recrystallization district is rolling.Finishing temperature is 840 ℃, and finished steel plate thickness is 20mm.After the rolling end, steel plate enters and accelerates cooling (ACC) device, is cooled to 590 ℃, cold bed cooling after the water outlet with the speed of 5 ℃/s.Afterwards steel plate is carried out tempering heat treatment, 630 ℃ of tempering temperatures, soaking time are 20min+t * 2.5min/mm, and wherein t is steel plate thickness, and unit is mm.Can obtain described steel plate at last
Embodiment 2
Embodiment is with embodiment 1, and wherein Heating temperature is 1240 ℃, total time inside furnace insulation 320 minutes, fs, rolling start rolling temperature was 1220 ℃, and workpiece thickness is 96mm, and the rolling start rolling temperature of subordinate phase is 892 ℃, finishing temperature is 831 ℃, and finished steel plate thickness is 38mm.After the rolling end, steel plate enters and accelerates cooling (ACC) device, is cooled to 589 ℃, cold bed cooling after the water outlet with the speed of 5 ℃/s.Afterwards steel plate is carried out tempering heat treatment, 630 ℃ of tempering temperatures, soaking time are 20min+t * 2.5min/mm, and wherein t is steel plate thickness, and unit is mm.Can obtain described steel plate at last
Embodiment 3
Embodiment is with embodiment 1, and wherein Heating temperature is 1233 ℃, total time inside furnace 340 minutes; Fs, rolling start rolling temperature was 1218 ℃, and workpiece thickness is 100mm; The rolling start rolling temperature of subordinate phase is 892 ℃, and finishing temperature is 821 ℃, and finished steel plate thickness is 50mm; After the rolling end, steel plate enters and accelerates cooling (ACC) device, is cooled to 558 ℃, cold bed cooling after the water outlet with the speed of 5 ℃/s.Afterwards steel plate is carried out tempering heat treatment, 610 ℃ of tempering temperatures, soaking time are 20min+t * 2.5min/mm, and wherein t is steel plate thickness, and unit is mm.Can obtain described steel plate at last
The chemical composition of table 1 embodiment of the invention 1～3 (wt%)
| Embodiment | C | Si | Mn | P | S | Nb | V | Ti | Ni | Cr | Mo |
| 1 | 0.07 | 0.24 | 1.45 | 0.009 | 0.003 | 0.038 | 0.038 | 0.015 | 0.23 | 0.17 | 0.17 |
| 2 | 0.08 | 0.25 | 1.45 | 0.008 | 0.002 | 0.035 | 0.040 | 0.014 | 0.25 | 0.18 | 0.17 |
| 3 | 0.08 | 0.25 | 1.46 | 0.008 | 0.003 | 0.034 | 0.040 | 0.013 | 0.25 | 0.18 | 0.19 |
[0030]Steel plate to the embodiment of the invention 1～3 carries out mechanical properties test, and assay sees Table 2.
The mechanical property of the steel plate of table 2 embodiment of the invention 1～3
Claims (2)
1. the production technique of a 600MPa level hydraulic power pressure steel for steel pipes plate, it is characterized in that, the chemical composition of described steel plate is C:0.06～0.09%, Si:0.20～0.40%, Mn:1.4～1.6%, P by weight percentage :≤0.015%, S :≤0.005%, Nb:0.02～0.04%, Ni:0.20～0.40%, Cr:0.10～0.30%, Mo:0.10～0.30%, V:0.03～0.05%, Ti:0.01～0.02%, surplus are Fe and inevitable impurity.
2. the production technique of a 600MPa level hydraulic power pressure steel for steel pipes plate as claimed in claim 1 is characterized in that:
Smelt according to chemical composition claimed in claim 1, and be cast into the rectangle steel ingot, the method that steel ingot is manufactured described steel plate is as follows:
1), heating and rolling:
(a), in heat-processed, Heating temperature is 1210 ℃ ~ 1250 ℃, total time inside furnace 〉=270min,
(b), rolling: as rollingly to be divided into the fs and subordinate phase is rolling:
Fs is rolling in the austenite recrystallization district, and in the operation of rolling, start rolling temperature is 1200～1230 ℃, and the 1st～2 reduction in pass should be greater than 10%, and all the other have at least 1～2 percentage pass reduction to be controlled at 20～40%;
Subordinate phase is rolling in austenite non-recrystallization district, start rolling temperature≤950 ℃, and in the operation of rolling, the accumulation draft is greater than 60%, and finishing temperature is 810～840 ℃;
2), cooling:
In process of cooling, steel plate enters accelerated cooling device, is cooled to below 600 ℃ with the speed of 〉=5 ℃/s.
3), tempering heat treatment
The steel plate tempering temperature is controlled at 610～650 ℃, and soaking time is 20min+t * 2.5min/mm, and wherein t is steel plate thickness, and unit is mm.
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| CN2012105787419A CN103045965A (en) | 2012-12-27 | 2012-12-27 | Technique for manufacturing steel plate for 600MPa hydropower steel penstock |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103602925A (en) * | 2013-11-29 | 2014-02-26 | 内蒙古包钢钢联股份有限公司 | Method for heating Ni-containing steel and removing iron oxide scales |
| CN103639198A (en) * | 2013-11-28 | 2014-03-19 | 莱芜钢铁集团有限公司 | Method for producing pipeline steel plate by continuous casting billet under condition of small reduction ratio |
| WO2017206419A1 (en) * | 2016-05-31 | 2017-12-07 | 江阴兴澄特种钢铁有限公司 | Low-compression-ratio ultra-thick eh36 ship plate steel and method for preparing same |
| CN108823489A (en) * | 2018-05-29 | 2018-11-16 | 唐山中厚板材有限公司 | A kind of 600MPa grades of water-power steel plate and its production method |
| 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 |
| CN111118257A (en) * | 2020-01-16 | 2020-05-08 | 包头钢铁（集团）有限责任公司 | Heat treatment method for improving impact toughness of boron-containing thick hydroelectric steel plate core |
| CN114134407A (en) * | 2021-06-04 | 2022-03-04 | 江阴兴澄特种钢铁有限公司 | Easy-to-weld steel plate with excellent low-temperature toughness at core for volute and manufacturing method thereof |
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| CN1908218A (en) * | 2006-08-24 | 2007-02-07 | 武汉钢铁(集团)公司 | Rolling controlled and cooling controlled steel for hydraulic power station penstock and manufacture method thereof |
| CN1932063A (en) * | 2005-09-12 | 2007-03-21 | 鞍钢股份有限公司 | Thick steel plate with high strength and low welding crack sensitivity and its production process |
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| CN102758138A (en) * | 2012-07-13 | 2012-10-31 | 秦皇岛首秦金属材料有限公司 | Method for producing hydropower steel with thin specification and low sensitivity to weld cracks |
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| CN1932063A (en) * | 2005-09-12 | 2007-03-21 | 鞍钢股份有限公司 | Thick steel plate with high strength and low welding crack sensitivity and its production process |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103639198A (en) * | 2013-11-28 | 2014-03-19 | 莱芜钢铁集团有限公司 | Method for producing pipeline steel plate by continuous casting billet under condition of small reduction ratio |
| CN103639198B (en) * | 2013-11-28 | 2015-11-11 | 莱芜钢铁集团有限公司 | The method of continuous casting billet production flow line steel plate is used under a kind of small reduction ratio condition |
| CN103602925A (en) * | 2013-11-29 | 2014-02-26 | 内蒙古包钢钢联股份有限公司 | Method for heating Ni-containing steel and removing iron oxide scales |
| CN103602925B (en) * | 2013-11-29 | 2015-08-12 | 内蒙古包钢钢联股份有限公司 | A kind of containing the heating of Ni steel and the method removing iron scale |
| WO2017206419A1 (en) * | 2016-05-31 | 2017-12-07 | 江阴兴澄特种钢铁有限公司 | Low-compression-ratio ultra-thick eh36 ship plate steel and method for preparing same |
| CN108823489A (en) * | 2018-05-29 | 2018-11-16 | 唐山中厚板材有限公司 | A kind of 600MPa grades of water-power steel plate and its production method |
| 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 |
| CN111118257A (en) * | 2020-01-16 | 2020-05-08 | 包头钢铁（集团）有限责任公司 | Heat treatment method for improving impact toughness of boron-containing thick hydroelectric steel plate core |
| CN114134407A (en) * | 2021-06-04 | 2022-03-04 | 江阴兴澄特种钢铁有限公司 | Easy-to-weld steel plate with excellent low-temperature toughness at core for volute and manufacturing method thereof |
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Application publication date: 20130417 |