CN101892373A - Heat treatment technology for low-temperature high impact toughness medium-thickness steel plate - Google Patents
Heat treatment technology for low-temperature high impact toughness medium-thickness steel plate Download PDFInfo
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- CN101892373A CN101892373A CN 201010211460 CN201010211460A CN101892373A CN 101892373 A CN101892373 A CN 101892373A CN 201010211460 CN201010211460 CN 201010211460 CN 201010211460 A CN201010211460 A CN 201010211460A CN 101892373 A CN101892373 A CN 101892373A
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Abstract
The invention discloses heat treatment technology for a low-temperature high impact toughness medium-thickness steel plate. The heat treatment technology comprises the following steps of: putting the steel plate into a furnace and heating, wherein the heating temperature is 50 to 100 DEG C lower than the Al temperature; keeping the temperature for 40 to 80 minutes; and discharging and performing air cooling to obtain the low-temperature high-toughness medium-thickness steel plate. The heat treatment technology can effectively solve the problems of plate warp, high heat treatment energy consumption, high maintenance cost of heat treatment equipment, low production efficiency and the like due to high heating temperature when normalizing heat treatment is performed on a TMCP steel plate, and also can obtain the low-temperature high-toughness steel plate at the temperature of 40 DEG C below zero.
Description
Technical field
The invention belongs to field of metallurgy, relate to a kind of steel plate heat treatment process, particularly a kind of thermal treatment process of high impact toughness intermediate gauge steel plate.
Background technology
Along with fast development of national economy, production such as bridge, boiler, pressurized vessel, vessel, wind tower increase day by day to the demand of steel plate, require more and more higher to the performance of steel plate, especially low-temperature impact toughness.The mode of production by hot rolling, cooling controlling and rolling controlling process (TMCP) only can be produced the structural steel and iron that can satisfy normal temperature to 0 ℃ impelling strength requirement usually; Although also can produce the quality plate that satisfies subzero 20 ℃ of impelling strength requirement with continuous perfect TMCP, but when steel plate thickness has requirement or more impelling strength requires when higher under the low temperature, TMCP has just shown limitation,, mechanical property instability poor as the steel plate inhomogeneity of structure, can't satisfy that subzero high impact toughness below 20 ℃ requires etc., must carry out normalizing, thermal treatment such as modified this moment to steel plate.
The production in enormous quantities experience of steel plate shows, for the TMCP steel plate of thickness in 12mm～80mm scope, carry out normalizing thermal treatment after, obtain the ideal mechanical property easily; And thickness is the TMCP steel plate in 5mm～10mm scope, and the mechanical property after the normalizing thermal treatment, especially low-temperature flexibility (below 40 ℃) can't reach standard-required.
Mainly come the production intermediate gauge (heat-treated steel plate of 4mm～16mm) at present by conventional normalizing+cold straightening.Conventional normalizing process generally is: steel plate at the heat treatment furnace internal heating to Ac
3Above temperature is come out of the stove air cooling to room temperature behind the insulation certain hour.Exist high-temperature phase-change, steel plate different zones to have the temperature difference because steel plate is come out of the stove in the process air cooler, have very big structural stress and thermal stresses in the cooled steel plate, these stress will impel steel plate generation warpage, have a strong impact on the plate shape (planeness) of steel plate.Particularly serious to the steel plate that thickness is little.In order to guarantee the plate shape of steel plate, cold strong machine commonly used carries out the brute force aligning.
Therefore, for intermediate gauge (heat-treated steel plate of 4mm～16mm), conventional normalizing process has the following disadvantages:
1, the Heating temperature height during the conventional normalizing thermal treatment of steel plate, energy consumption is big;
2, the steel-plate shape after the thermal treatment is wayward, needs with cold strong machine aligning;
3, Equipment for Heating Processing maintenance cost height, the production cycle is long, efficient is low;
4, remove incomplete, be present in defective or other hard thing on the surface of steel plate, when aligning, easily embed steel plate and form surperficial pockmark, influence plate surface quality;
℃ 5 ,-40 the low temperature impact properties below can't reach standard-required, and especially thickness is the following steel plate of 10mm.
Summary of the invention
In order to overcome in the prior art thickness is the existing deficiency of conventional normalizing process of 4mm～10mm TMCP steel plate, the thermal treatment process that the purpose of this invention is to provide a kind of low-temperature high impact toughness intermediate gauge steel plate, when both can effectively having solved the thermal treatment of TMCP steel plate, this thermal treatment process, can obtain the steel plate of high low-temperature impact toughness (below 40 ℃) again because of problems such as high plate shape warpage, thermal treatment energy consumption height, Equipment for Heating Processing maintenance cost height, the production efficiency that causes of Heating temperature are low.
The objective of the invention is to be achieved through the following technical solutions:
A kind of thermal treatment process of low-temperature high impact toughness intermediate gauge steel plate is characterized in that this thermal treatment process comprises following operation:
1) steel plate is gone into stove, heating, and wherein Heating temperature is lower than A
150 ℃～100 ℃ of temperature;
2) insulation, soaking time is 40～80min;
3) air cooling of coming out of the stove obtains low-temperature high-toughness intermediate gauge steel plate.
The chemical ingredients mass percent of steel plate of the present invention is: 0.040%～0.16%C, 0.2%～0.5%Si, 1.2%～1.8%Mn, 0.02～0.04%Nb, 0.04～0.07%V, 0.01～0.02%Ti, S less than 0.005%, P less than 0.010%, all the other are iron Fe.Described intermediate gauge steel plate is the steel plate that is obtained by cooling controlling and rolling controlling process, and the thickness of steel plate is 4mm～10mm.
Thermal treatment process flow process of the present invention comprises: steel plate is gone into stove → heat → be incubated → air cooling of coming out of the stove, and wherein Heating temperature is lower than A
150 ℃～100 ℃ of temperature, soaking time are that 40～80min, the type of cooling are air cooling.
The present invention has following characteristics.
1, the Heating temperature during steel plate thermal treatment is lower than A
1, do not reach the high-temperature phase-change temperature (A of steel
3), shortened heat treatment cycle, there is not high-temperature phase-change stress during cooling yet;
2, the Heating temperature during steel plate thermal treatment is lower than A
1, than conventional normalizing heat tracing temperature (Ac
3More than) much lower, thermal stresses is also much smaller.
3, do not have high-temperature phase-change stress during steel plate thermal treatment, thermal stresses is low, warpage no longer took place in air cooling after steel plate was come out of the stove. need not the straightener aligning, shortened the production cycle, can not go out the Surface Defects in Steel Plate that may cause because of aligning yet, as the hard thing in surface occurs and be pressed into steel plate, guaranteed the surface quality of steel plate.
4, the comprehensive mechanical property of plate is higher, this is because to have monolateral thickness be the non-ferrite+pearlitic structure of 2～3mm, Quench on TMCP steel plate top layer, when heat tracing, the Quench tissue on steel plate top layer will change into organizes tempered sorbite tissue tiny, that mechanical property is high, and this layer tissue has guaranteed that steel plate has high low-temperature impact toughness;
Compare with conventional normalizing+cold straightening technology, the present invention is used for steel plate thermal treatment, has advantages such as Production Flow Chart is short, energy consumption is low, production cost is low, inside and outside quality height, especially low-temperature impact toughness (below the 40 ℃) height of the steel plate that obtains.
Embodiment
Below in conjunction with embodiment the present invention is further set forth:
Embodiment 1
A kind of thermal treatment process of low-temperature high impact toughness intermediate gauge steel plate of the present invention, the S355NL TMCP steel plate of employing 8mm.Steel plate enters in the roller hearth heat-treated furnace and heats, the air cooling of coming out of the stove behind the insulation 40min when steel plate is heated to 650 ℃ ± 5 ℃.
Result after the performance test that the steel plate planeness detects and steel plate is taken a sample is as follows:
1, the maximum roughness of steel plate is less than 1.6mm/2m;
2, mechanical property: ReL:447MPa, Rm:547MPa, A:32.4% ,-60 ℃ of ballistic works (J) are for (specimen size is: 7.5 * 10 * 55): 171/185/162.
Above-mentioned mechanical property all meets the respective standard requirement.
Embodiment 2
The thermal treatment process of another low-temperature high impact toughness intermediate gauge steel plate of the present invention, the S355NL TMCP steel plate of employing 8mm.Steel plate enters in the roller hearth heat-treated furnace and heats, the air cooling of coming out of the stove behind the insulation 40min when steel plate is heated to 630 ℃ ± 5 ℃.
Result after the performance test that the steel plate planeness detects and steel plate is taken a sample is as follows:
1, the maximum roughness of steel plate is less than 1.5mm/2m;
2, mechanical property: ReL:365MPa, Rm:540MPa, A:31% ,-50 ℃ of ballistic works (J) are for (specimen size is: 7.5 * 10 * 55): 180/186/177.
Above-mentioned mechanical property all meets the respective standard requirement.
Embodiment 3
The thermal treatment process of another low-temperature high impact toughness intermediate gauge steel plate, the Q690TMCP steel plate of employing 10mm.Steel plate enters in the roller hearth heat-treated furnace and heats, the air cooling of coming out of the stove behind the insulation 40min when steel plate is heated to 610 ℃ ± 5 ℃.
Result after the performance test that the steel plate planeness detects and steel plate is taken a sample is as follows:
1, the maximum roughness of steel plate is less than 1.3mm/2m;
2, mechanical property: Rel:718MPa, Rm:778MPa, A:18.8% ,-40 ℃ of ballistic works (J) are for (specimen size is: 10 * 10 * 55): 67/87/80.
By embodiment as can be known, the present invention is used for steel plate thermal treatment, has advantages such as Production Flow Chart is short, energy consumption is low, production cost is low, inside and outside quality height, especially low-temperature impact toughness (below the 40 ℃) height of the steel plate that obtains.
Claims (4)
1. the thermal treatment process of a low-temperature high impact toughness intermediate gauge steel plate is characterized in that this thermal treatment process comprises following operation:
1) steel plate is gone into stove, heating, and wherein Heating temperature is lower than A
150 ℃～100 ℃ of temperature;
2) insulation, soaking time is 40～80min;
3) air cooling of coming out of the stove obtains low-temperature high-toughness intermediate gauge steel plate.
2. the thermal treatment process of low-temperature high impact toughness intermediate gauge steel plate according to claim 1 is characterized in that: the chemical ingredients mass percent of described steel plate is: 0.040%～0.16%C, 0.2%～0.5%Si, 1.2%～1.8%Mn, 0.02～0.04%Nb, 0.04～0.07%V, 0.01～0.02%Ti, S less than 0.005%, P less than 0.010%, all the other are iron Fe.
3. the thermal treatment process of low-temperature high impact toughness intermediate gauge steel plate according to claim 1 is characterized in that: the thickness of described intermediate gauge steel plate is 4mm～10mm.
4. according to the thermal treatment process of the described low-temperature high impact toughness intermediate gauge of claim 1 steel plate, it is characterized in that: described intermediate gauge steel plate is the steel plate that is obtained by cooling controlling and rolling controlling process.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605245A (en) * | 2011-12-30 | 2012-07-25 | 内蒙古包钢钢联股份有限公司 | Ni-free normalized type Q370R pressure vessel steel plate and manufacturing method thereof |
| CN103341528A (en) * | 2013-07-12 | 2013-10-09 | 鞍钢股份有限公司 | Cold straightening method for buckling steel plate being less than 6mm |
| CN103510000A (en) * | 2012-06-25 | 2014-01-15 | 广东韶钢松山股份有限公司 | Ship and marine engineering steel with characteristics of high toughness and low NDT temperature, and production process thereof |
| CN106148833A (en) * | 2015-03-30 | 2016-11-23 | 鞍钢股份有限公司 | A kind of normalizing state 36 feather weight sea work steel steel plate and production method thereof |
| CN107604152A (en) * | 2017-10-13 | 2018-01-19 | 苏州圣亚精密机械有限公司 | A kind of handware Equipment for Heating Processing of Temperature Control Type |
| CN116590610A (en) * | 2023-04-17 | 2023-08-15 | 包头钢铁（集团）有限责任公司 | Normalizing type pressure vessel steel plate with yield strength of 370MPa and preparation method thereof |
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| CN1718824A (en) * | 2005-07-11 | 2006-01-11 | 周裕香 | Processing method of material for liquid alkali nickel containing ductile iron valve |
| CN101058842A (en) * | 2007-05-25 | 2007-10-24 | 山西太钢不锈钢股份有限公司 | Method for increasing toughness of low temperature steel plate |
| CN101358319A (en) * | 2008-09-02 | 2009-02-04 | 首钢总公司 | Low carbonaceous steel plate for 610MPa grade high strength pressure vessels and production method thereof |
| CN101476030A (en) * | 2009-01-15 | 2009-07-08 | 新余钢铁股份有限公司 | Thin specification steel plate heat treatment process |
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Patent Citations (4)
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| CN1718824A (en) * | 2005-07-11 | 2006-01-11 | 周裕香 | Processing method of material for liquid alkali nickel containing ductile iron valve |
| CN101058842A (en) * | 2007-05-25 | 2007-10-24 | 山西太钢不锈钢股份有限公司 | Method for increasing toughness of low temperature steel plate |
| CN101358319A (en) * | 2008-09-02 | 2009-02-04 | 首钢总公司 | Low carbonaceous steel plate for 610MPa grade high strength pressure vessels and production method thereof |
| CN101476030A (en) * | 2009-01-15 | 2009-07-08 | 新余钢铁股份有限公司 | Thin specification steel plate heat treatment process |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605245A (en) * | 2011-12-30 | 2012-07-25 | 内蒙古包钢钢联股份有限公司 | Ni-free normalized type Q370R pressure vessel steel plate and manufacturing method thereof |
| CN103510000A (en) * | 2012-06-25 | 2014-01-15 | 广东韶钢松山股份有限公司 | Ship and marine engineering steel with characteristics of high toughness and low NDT temperature, and production process thereof |
| CN103341528A (en) * | 2013-07-12 | 2013-10-09 | 鞍钢股份有限公司 | Cold straightening method for buckling steel plate being less than 6mm |
| CN106148833A (en) * | 2015-03-30 | 2016-11-23 | 鞍钢股份有限公司 | A kind of normalizing state 36 feather weight sea work steel steel plate and production method thereof |
| CN107604152A (en) * | 2017-10-13 | 2018-01-19 | 苏州圣亚精密机械有限公司 | A kind of handware Equipment for Heating Processing of Temperature Control Type |
| CN107604152B (en) * | 2017-10-13 | 2018-11-27 | 苏州圣亚精密机械有限公司 | A kind of handware Equipment for Heating Processing of Temperature Control Type |
| CN116590610A (en) * | 2023-04-17 | 2023-08-15 | 包头钢铁（集团）有限责任公司 | Normalizing type pressure vessel steel plate with yield strength of 370MPa and preparation method thereof |
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Open date: 20101124 |