CN102251079A - Water-quenching-and-tempering heat treatment process for high-temperature high-pressure low-alloy steel casting for turbine - Google Patents
Water-quenching-and-tempering heat treatment process for high-temperature high-pressure low-alloy steel casting for turbine Download PDFInfo
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- CN102251079A CN102251079A CN2011101921772A CN201110192177A CN102251079A CN 102251079 A CN102251079 A CN 102251079A CN 2011101921772 A CN2011101921772 A CN 2011101921772A CN 201110192177 A CN201110192177 A CN 201110192177A CN 102251079 A CN102251079 A CN 102251079A
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Abstract
The invention discloses a water-quenching-and-tempering heat treatment process for a high-temperature high-pressure low-alloy steel casting for a turbine, which mainly comprises the following steps: normalizing, water quenching and tempering. Compared with the conventional heat treatment process of normalizing, oil quenching and tempering, the heat treatment process of the invention has the advantage that: because oil quenching is replaced by water quenching, the quality of steel casting products is ensured, the production cost is reduced greatly, environment pollution is relieved greatly, and the safety hazard of fire during oil quenching is avoided.
Description
Technical field
The present invention relates to a kind of thermal treatment process, be specifically related to a kind of steam turbine High Temperature High Pressure low alloy steel castings shrend quenching-and-tempering process.
Background technology
At present, the steam turbine thermal power generation is the main mode of China's supply of electric power, in cylinder class in the Steam Turbine, valve type and the bend pipe class steel casting, a lot of products are all selected the low-alloy cast steel material of high temperature high voltage resistant for use, as the heavy steam turbine ZG17Cr1Mo1V in north, Beijing, east steam turbine ZG15Cr1Mo1V, ZG15Cr1Mo1 etc., for the mechanical property of giving full play to material with guarantee that each position of product obtains hardness uniformly, modified thermal treatment is the optimal heat processing mode.
ZG17Cr1Mo1V, ZG15Cr1Mo1V and ZG15Cr1Mo1 are in cast steel low alloy steel, be to belong to castingprocesses than the steel part that is easier to occur cold crack, in the prior art the modified thermal treatment of this class steel casting is selected for use normalizing+quenching+tempered mode usually at present, and quenchant to select the weight ratio of modified oil usually for use be 1:8, be that 1 ton of steel casting of oil quenching must guarantee that the modified weight of oil of oil sump is no less than 8 tons, could guarantee modified effect.In addition, modified oil is after use after a while, if after viscosity surpasses certain numerical value or oil mass minimizing, must add new modified oil, the expense that this shows oil quenching is quite high.When the user adopted oil quenching to handle simultaneously, the oil smoke that modified oil also exists potential safety hazard on fire easily and modified oil reaction back to produce also can pollute environment.
Summary of the invention
At the deficiencies in the prior art, the object of the present invention is to provide a kind of steam turbine High Temperature High Pressure low alloy steel castings shrend quenching-and-tempering process, this thermal treatment process had both guaranteed the steel casting quality product, greatly reduced production cost again, minimizing is to the pollution of environment, the potential safety hazard of presence of fire in the time of also can avoiding oil quenching.
For achieving the above object, the invention provides a kind of steam turbine High Temperature High Pressure low alloy steel castings shrend quenching-and-tempering process, this technology may further comprise the steps:
(1) steam turbine High Temperature High Pressure low alloy steel castings casting;
(2) steam turbine carries out normalizing treatment with the High Temperature High Pressure low alloy steel castings, and 1040 ℃～1060 ℃ insulations 2～4 hours, the high wind of coming out of the stove was chilled to room temperature;
(3) steam turbine carries out Water Quenching with the High Temperature High Pressure low alloy steel castings, and 970 ℃～990 ℃ insulations 2～4 hours, the water-cooled of coming out of the stove was to room temperature;
(4) steam turbine carries out temper with the High Temperature High Pressure low alloy steel castings, and 720 ℃～740 ℃ insulations 3～6 hours, stove was chilled to below 250 ℃ and comes out of the stove.
Technology of the present invention compared with prior art has following technique effect:
1, significantly reduces the thermal treatment cost, because water is than oily considerably cheaper, and the heat storage coefficient of water compares innage, the weight ratio of steel casting and water requires the minimum 1:5 that reaches, the density that adds water compares innage, therefore the required water quenching pool volume ratio oil quenching pond volume of shrend can be little a lot, can reduce floor space, further reduce production costs;
2, because oil quenching is compared in shrend, therefore the potential safety hazard operation on fire of modified oil does not need the input and the maintenance of extra a large amount of fire servicies when having oil quenching;
3, owing to can not produce oil smoke during shrend, so shrend do not pollute the environment, and can not cause actual bodily harm to the operator yet.
Embodiment
Below in conjunction with embodiment, the present invention is done detailed description further.Enumerate three specific embodiments below, but the scope that the present invention protected is not limited to the expressed scope of embodiment.
Embodiment 1
The concrete implementation step of present embodiment is as follows:
(1) steam turbine High Temperature High Pressure low alloy steel castings casting;
(2) steam turbine carries out normalizing treatment with the High Temperature High Pressure low alloy steel castings, and 1040 ℃ of insulations 4 hours, the high wind of coming out of the stove was chilled to room temperature;
(3) steam turbine carries out Water Quenching with the High Temperature High Pressure low alloy steel castings, and 970 ℃ of insulations 4 hours, the water-cooled of coming out of the stove was to room temperature;
(4) steam turbine carries out temper with the High Temperature High Pressure low alloy steel castings, and 720 ℃ of insulations 6 hours, stove was chilled to below 250 ℃ and comes out of the stove.
Embodiment 2
The concrete implementation step of present embodiment is as follows:
(1) steam turbine High Temperature High Pressure low alloy steel castings casting;
(2) steam turbine carries out normalizing treatment with the High Temperature High Pressure low alloy steel castings, and 1050 ℃ of insulations 3 hours, the high wind of coming out of the stove was chilled to room temperature;
(3) steam turbine carries out Water Quenching with the High Temperature High Pressure low alloy steel castings, and 980 ℃ of insulations 3 hours, the water-cooled of coming out of the stove was to room temperature;
(4) steam turbine carries out temper with the High Temperature High Pressure low alloy steel castings, and 730 ℃ of insulations 4.5 hours, stove was chilled to below 250 ℃ and comes out of the stove.
Embodiment 3
The concrete implementation step of present embodiment is as follows:
(1) steam turbine High Temperature High Pressure low alloy steel castings casting;
(2) steam turbine carries out normalizing treatment with the High Temperature High Pressure low alloy steel castings, and 1060 ℃ of insulations 2 hours, the high wind of coming out of the stove was chilled to room temperature;
(3) steam turbine carries out Water Quenching with the High Temperature High Pressure low alloy steel castings, and 990 ℃ of insulations 2 hours, the water-cooled of coming out of the stove was to room temperature;
(4) steam turbine carries out temper with the High Temperature High Pressure low alloy steel castings, and 740 ℃ of insulations 3 hours, stove was chilled to below 250 ℃ and comes out of the stove.
Be that example adopts Chemical Composition and the mechanical property synopsis after existing thermal treatment process technology (normalizing+oil quenching+tempering) and thermal treatment process technology of the present invention (normalizing+shrend+tempering) are handled respectively with ZG17Cr1Mo1V material steel casting below.
The Chemical Composition contrast of table 1:ZG17Cr1Mo1V under two kinds of thermal treatment process
The mechanical property contrast of table 2:ZG17Cr1Mo1V under two kinds of thermal treatment process
Can find that from table 1 and table 2 the present invention changes the oil quenching in the modified thermal treatment into shrend, can guarantee the quality product of steel casting fully.In addition, oil quenching changes shrend into and can greatly reduce production costs, and reduces the pollution to environment, the potential safety hazard of presence of fire in the time of also can avoiding oil quenching.
Claims (1)
1. a steam turbine is with High Temperature High Pressure low alloy steel castings shrend quenching-and-tempering process, and it is characterized in that: this technology may further comprise the steps:
(1) steam turbine High Temperature High Pressure low alloy steel castings casting;
(2) steam turbine carries out normalizing treatment with the High Temperature High Pressure low alloy steel castings, and 1040 ℃～1060 ℃ insulations 2～4 hours, the high wind of coming out of the stove was chilled to room temperature;
(3) steam turbine carries out Water Quenching with the High Temperature High Pressure low alloy steel castings, and 970 ℃～990 ℃ insulations 2～4 hours, the water-cooled of coming out of the stove was to room temperature;
(4) steam turbine carries out temper with the High Temperature High Pressure low alloy steel castings, and 720 ℃～740 ℃ insulations 3～6 hours, stove was chilled to below 250 ℃ and comes out of the stove.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101921772A CN102251079A (en) | 2011-07-11 | 2011-07-11 | Water-quenching-and-tempering heat treatment process for high-temperature high-pressure low-alloy steel casting for turbine |
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| CN2011101921772A CN102251079A (en) | 2011-07-11 | 2011-07-11 | Water-quenching-and-tempering heat treatment process for high-temperature high-pressure low-alloy steel casting for turbine |
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| CN102251079A true CN102251079A (en) | 2011-11-23 |
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| CN2011101921772A Pending CN102251079A (en) | 2011-07-11 | 2011-07-11 | Water-quenching-and-tempering heat treatment process for high-temperature high-pressure low-alloy steel casting for turbine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102719630A (en) * | 2012-07-04 | 2012-10-10 | 英山华茂船舶舾装设备有限公司 | Heat treatment process of wear-resistant high-strength low-alloy steel casting piece for automatic container fastening lock |
| CN103882190A (en) * | 2014-04-04 | 2014-06-25 | 宁夏共享铸钢有限公司 | Method for producing steel casting |
| CN105400940A (en) * | 2015-12-30 | 2016-03-16 | 天津重型装备工程研究有限公司 | Heat treatment process for crown casting of large-sized hydraulic turbine |
Citations (2)
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| CN101929313A (en) * | 2009-06-24 | 2010-12-29 | 宝山钢铁股份有限公司 | High-strength hydrogen-sulfide environmental corrosion-resistant seamless petroleum casing pipe and manufacturing method thereof |
| CN201722406U (en) * | 2010-05-31 | 2011-01-26 | 宁波吉威熔模铸造有限公司 | Thermal treating device for alloy steel products |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101929313A (en) * | 2009-06-24 | 2010-12-29 | 宝山钢铁股份有限公司 | High-strength hydrogen-sulfide environmental corrosion-resistant seamless petroleum casing pipe and manufacturing method thereof |
| CN201722406U (en) * | 2010-05-31 | 2011-01-26 | 宁波吉威熔模铸造有限公司 | Thermal treating device for alloy steel products |
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| 《金属热处理》 19951231 陈春香 "ZG15Cr1Mo1V热强钢热处理工艺的改进" 第35,50页 1 , 第10期 * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102719630A (en) * | 2012-07-04 | 2012-10-10 | 英山华茂船舶舾装设备有限公司 | Heat treatment process of wear-resistant high-strength low-alloy steel casting piece for automatic container fastening lock |
| CN103882190A (en) * | 2014-04-04 | 2014-06-25 | 宁夏共享铸钢有限公司 | Method for producing steel casting |
| CN103882190B (en) * | 2014-04-04 | 2016-04-06 | 宁夏共享铸钢有限公司 | A kind of production method of steel casting |
| CN105400940A (en) * | 2015-12-30 | 2016-03-16 | 天津重型装备工程研究有限公司 | Heat treatment process for crown casting of large-sized hydraulic turbine |
| CN105400940B (en) * | 2015-12-30 | 2017-07-14 | 天津重型装备工程研究有限公司 | The Technology for Heating Processing of large-scale water turbine crown casting |
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Application publication date: 20111123 |