CN104451073A - Heat treatment method for removing delta ferrites in ferritic heat-resistant steel - Google Patents
Heat treatment method for removing delta ferrites in ferritic heat-resistant steel Download PDFInfo
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- CN104451073A CN104451073A CN201410748781.2A CN201410748781A CN104451073A CN 104451073 A CN104451073 A CN 104451073A CN 201410748781 A CN201410748781 A CN 201410748781A CN 104451073 A CN104451073 A CN 104451073A
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Abstract
The invention discloses a heat treatment method for removing delta ferrites in ferritic heat-resistant steel, belonging to the field of iron and steel metallurgy. The heat treatment method comprises the following steps: (1) feeding ferritic heat-resistant steel parts with delta ferrites into a furnace, and heating at a heating temperature of 1140-1160 DEG C; (2) performing heat preservation on the heated parts under the condition that the heat preservation time is 4-6 hours; (3) performing air cooling on the parts subjected to heat preservation to room temperature; (4) heating the parts subjected to air cooling under the condition that the heating temperature is 1040-1060 DEG C; and (5) performing heat preservation on the heated parts again under the condition that the heat preservation time is 2-4 hours, and then performing air cooling to room temperature. According to the heat treatment method disclosed by the invention, the ferritic heat-resistant steel parts with the delta ferrites are heated to be austenitized so as to ensure that ferrite forming elements and austenite forming elements are uniformly diffused, micro area segregation of the elements can be eliminated, and the delta ferrites can be removed; and by performing low-temperature austenization again, recrystallization can be performed, crystal grains can be refined, and good original tissues can be provided for subsequent heat treatment.
Description
Technical field
A kind of heat treating method eliminating delta ferrite in jessop of the present invention, belongs to field of steel metallurgy.
Background technology
In jessop, the room temperature impact reducing material is absorbed merit and creep rupture strength by delta ferrite.Explicitly call for the strict content controlling delta ferrite in jessop, its content should be less than 3%.The same with alpha ferrite, delta ferrite is also the important alloy phase of Fe and C composition, for body-centered cubic structure, containing Cr, W, Mo alloying element in delta ferrite in steel alloy, at high temperature formed unlike delta ferrite, therefore also known as high temperature iron ferritic, lattice parameter and alpha ferrite slightly difference.Relative to the martensite formed after austenite and generation diffusionless transformation subsequently, in delta ferrite, ferrite former Cr, Mo, W, V, Nb, Al, Si content is higher, and austenite former C, N, Mn, Ni, Cu, Co content is relatively low.
The method of Traditional control delta ferrite is only achieved the goal by the content of each element in control material chemical composition, but cannot eliminate the delta ferrite formed due to composition microcell segregation in ingot casting process.
Summary of the invention
The object of the present invention is to provide a kind of heat treating method eliminating delta ferrite in jessop, the method can eliminate already present delta ferrite in jessop, makes the delta ferrite level in steel be less than 3%.
Technical solution:
The inventive method step is as follows: the jessop part that 1) there is delta ferrite enters stove heating; 2) part after heating is incubated; 3) part after insulation carries out air cooling to room temperature; 4) part after air cooling heats; 5) part after heating is incubated rear air cooling again to room temperature.
Further: the jessop part that there is delta ferrite enters stove heating, and Heating temperature is 1140 DEG C ~ 1160 DEG C.
Further: be incubated the part after heating, soaking time is 4h ~ 6h.
Further: carry out air cooling to the part after insulation, air cooling is to room temperature.
Further: to heat the part after air cooling, Heating temperature is 1040 DEG C ~ 1060 DEG C.
Further: be incubated rear air cooling again to the part after heating, soaking time is 2h ~ 4h, and air cooling is to room temperature.
The present invention is according to the origin peculiarity of delta ferrite in jessop, to there is the jessop heat parts of delta ferrite to 1140 DEG C ~ 1160 DEG C austenitizings, Cr, Mo, W, V, Nb, Al, Si ferrite former and C, N, Mn, Ni, Cu, Co austenite former is made fully to spread evenly by insulation 4h ~ 6h, eliminate the microcell segregation of element, thus eliminate the delta ferrite in jessop.The austenitizing Heating temperature eliminating delta ferrite is high, and grain fineness number becomes thick, and by 1040 DEG C again ~ 1060 DEG C low temperature austenitizings, recrystallize occurs, and crystal grain thinning, for follow-up thermal treatment provides good original structure.
Accompanying drawing explanation
Fig. 1 is present invention process figure;
Fig. 2 is metallographic structure figure of the present invention;
Fig. 3 is existing metallographic structure figure.
Embodiment
Embodiment 1:
The present invention is for the jessop part that there is delta ferrite, stove heating is entered according to Fig. 1 method, Heating temperature is 1140 DEG C, after insulation 4h, air cooling is to room temperature, part after air cooling heats, Heating temperature is 1040 DEG C, and after insulation 2h, air cooling is to room temperature, and the delta ferrite level in jessop part is less than 3%.
Embodiment 2:
The present invention is for the jessop part that there is delta ferrite, stove heating is entered according to Fig. 1 method, Heating temperature is 1150 DEG C, after insulation 4h, air cooling is to room temperature, part after air cooling heats, Heating temperature is 1040 DEG C, and after insulation 2h, air cooling is to room temperature, and the delta ferrite level in jessop part is less than 3%.
Embodiment 3:
The present invention is for the jessop part that there is delta ferrite, stove heating is entered according to Fig. 1 method, Heating temperature is 1160 DEG C, after insulation 4h, air cooling is to room temperature, part after air cooling heats, Heating temperature is 1040 DEG C, and after insulation 2h, air cooling is to room temperature, and the delta ferrite level in jessop part is less than 3%.
Embodiment 4:
The present invention is for the jessop part that there is delta ferrite, stove heating is entered according to Fig. 1 method, Heating temperature is 1140 DEG C, after insulation 5h, air cooling is to room temperature, part after air cooling heats, Heating temperature is 1040 DEG C, and after insulation 2h, air cooling is to room temperature, and the delta ferrite level in jessop part is less than 3%.
Embodiment 5:
The present invention is for the jessop part that there is delta ferrite, stove heating is entered according to Fig. 1 method, Heating temperature is 1140 DEG C, after insulation 6h, air cooling is to room temperature, part after air cooling heats, Heating temperature is 1040 DEG C, and after insulation 2h, air cooling is to room temperature, and the delta ferrite level in jessop part is less than 3%.
Embodiment 6:
The present invention is for the jessop part that there is delta ferrite, stove heating is entered according to Fig. 1 method, Heating temperature is 1140 DEG C, after insulation 4h, air cooling is to room temperature, part after air cooling heats, Heating temperature is 1050 DEG C, and after insulation 2h, air cooling is to room temperature, and the delta ferrite level in jessop part is less than 3%.
Embodiment 7:
The present invention is for the jessop part that there is delta ferrite, stove heating is entered according to Fig. 1 method, Heating temperature is 1140 DEG C, after insulation 4h, air cooling is to room temperature, part after air cooling heats, Heating temperature is 1060 DEG C, and after insulation 2h, air cooling is to room temperature, and the delta ferrite level in jessop part is less than 3%.
Embodiment 8:
The present invention is for the jessop part that there is delta ferrite, stove heating is entered according to Fig. 1 method, Heating temperature is 1140 DEG C, after insulation 4h, air cooling is to room temperature, part after air cooling heats, Heating temperature is 1050 DEG C, and after insulation 3h, air cooling is to room temperature, and the delta ferrite level in jessop part is less than 3%.
Embodiment 9:
The present invention is for the jessop part that there is delta ferrite, stove heating is entered according to Fig. 1 method, Heating temperature is 1140 DEG C, after insulation 4h, air cooling is to room temperature, part after air cooling heats, Heating temperature is 1050 DEG C, and after insulation 4h, air cooling is to room temperature, and the delta ferrite level in jessop part is less than 3%.
Claims (1)
1. eliminate a heat treating method for delta ferrite in jessop, it is characterized in that, method steps is as follows: the jessop part that 1) there is delta ferrite enters stove heating, and Heating temperature is 1140 DEG C ~ 1160 DEG C; 2) be incubated the part after heating, soaking time is 4h ~ 6h; 3) carry out air cooling to the part after insulation, air cooling is to room temperature; 4) heat the part after air cooling, Heating temperature is 1040 DEG C ~ 1060 DEG C; 5) be incubated rear air cooling again to the part after heating, soaking time is 2h ~ 4h, and air cooling is to room temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410748781.2A CN104451073A (en) | 2014-08-14 | 2014-12-10 | Heat treatment method for removing delta ferrites in ferritic heat-resistant steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2014103991896 | 2014-08-14 | ||
| CN201410399189 | 2014-08-14 | ||
| CN201410748781.2A CN104451073A (en) | 2014-08-14 | 2014-12-10 | Heat treatment method for removing delta ferrites in ferritic heat-resistant steel |
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| CN104451073A true CN104451073A (en) | 2015-03-25 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104762456A (en) * | 2015-04-02 | 2015-07-08 | 中国化学工程第七建设有限公司 | Step-by-step cooling and heating treatment method for heat-resistant steel |
| CN107245563A (en) * | 2017-07-10 | 2017-10-13 | 青岛大学 | It is a kind of to improve indissoluble delta ferrite solid solution speed in martensite type refractory steel ingot casting while the technology of fining austenite grains |
| CN108893588A (en) * | 2018-07-26 | 2018-11-27 | 青岛大学 | A kind of method of delta ferrite solid solution rate in raising steel |
| CN109082608A (en) * | 2018-10-26 | 2018-12-25 | 成都先进金属材料产业技术研究院有限公司 | The method for controlling delta ferrite level in low straight-chromiun stainless steel |
| CN115852251A (en) * | 2022-11-03 | 2023-03-28 | 中国原子能科学研究院 | Homogenization method for regulating delta ferrite content in ferrite/martensite heat-resistant steel |
Citations (2)
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| JPS63100125A (en) * | 1986-10-15 | 1988-05-02 | Kawasaki Steel Corp | Manufacture of very thick high cr steel having superior toughness at low temperature |
| CN101148738A (en) * | 2007-10-23 | 2008-03-26 | 山东理工大学 | Strengthened ferrite series heat-resistant steel with nano precipitated phase and manufacturing method thereof |
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2014
- 2014-12-10 CN CN201410748781.2A patent/CN104451073A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63100125A (en) * | 1986-10-15 | 1988-05-02 | Kawasaki Steel Corp | Manufacture of very thick high cr steel having superior toughness at low temperature |
| CN101148738A (en) * | 2007-10-23 | 2008-03-26 | 山东理工大学 | Strengthened ferrite series heat-resistant steel with nano precipitated phase and manufacturing method thereof |
Non-Patent Citations (1)
| Title |
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| 马力深等: "δ铁素体对12%Cr超超临界转子钢冲击性能的影响", 《清华大学学报（自然科学版）》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104762456A (en) * | 2015-04-02 | 2015-07-08 | 中国化学工程第七建设有限公司 | Step-by-step cooling and heating treatment method for heat-resistant steel |
| CN107245563A (en) * | 2017-07-10 | 2017-10-13 | 青岛大学 | It is a kind of to improve indissoluble delta ferrite solid solution speed in martensite type refractory steel ingot casting while the technology of fining austenite grains |
| CN108893588A (en) * | 2018-07-26 | 2018-11-27 | 青岛大学 | A kind of method of delta ferrite solid solution rate in raising steel |
| CN108893588B (en) * | 2018-07-26 | 2019-10-25 | 青岛大学 | A kind of method of delta ferrite solid solution rate in raising steel |
| CN109082608A (en) * | 2018-10-26 | 2018-12-25 | 成都先进金属材料产业技术研究院有限公司 | The method for controlling delta ferrite level in low straight-chromiun stainless steel |
| CN115852251A (en) * | 2022-11-03 | 2023-03-28 | 中国原子能科学研究院 | Homogenization method for regulating delta ferrite content in ferrite/martensite heat-resistant steel |
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Application publication date: 20150325 |
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