CN102382949A - Isothermal spheroidizing method for 5Cr5MoSiV1 steel for shield cutter - Google Patents
Isothermal spheroidizing method for 5Cr5MoSiV1 steel for shield cutter Download PDFInfo
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- CN102382949A CN102382949A CN2011103692617A CN201110369261A CN102382949A CN 102382949 A CN102382949 A CN 102382949A CN 2011103692617 A CN2011103692617 A CN 2011103692617A CN 201110369261 A CN201110369261 A CN 201110369261A CN 102382949 A CN102382949 A CN 102382949A
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Abstract
An isothermal spheroidizing method for 5Cr5MoSiV1 steel for a shield cutter is realized in that the steel is heated up to 860-900 DEG C with a furnace and is thermally insulated for 3 to 4 hours; then the steel is cooled to the temperature below 500 DEG C with the furnace and is subjected to air cooling after getting out of the furnace; and before getting out of the furnace and being subjected to air cooling at the temperature below 500 DEG C, the steel is subjected to air cooling to the temperature of 720-750 DEG C and is thermally insulated for 3 to 4 hours. Due to the isothermal spheroidizing method, the 5Cr5MoSiV1 steel can acquire a large quantity of globular carbide particles after being annealed, and the globular carbide particles are dispersed and uniformly sized and are round as is shown in figure 2. The carbide provides a large quantity of nucleation cores for the subsequent annealing treatment, so that austenite grains cannot grow up easily and the inclination of deformation and crack can be reduced during the annealing, so that the strength, hardness and other comprehensive properties of a hobbing cutter ring can be obviously improved.
Description
Technical field
The present invention relates to a kind of method for annealing, relate in particular to the isothermal spheroidizing method of a kind of shield cutter with steel 5Cr5MoSiV1.
Background technology
Shield engine is a kind of construction machinery of widespread use in underground works and tunnel driving in recent years, and hobboing cutter is one of a kind of cutter commonly used that is used to tunnel on the cutter head of shield machine, mainly is made up of cutter ring.Hobboing cutter is when work, and the surging force and the squeeze that produce when mainly relying on the hobboing cutter rotation to advance are broken rock.Because the HS and the high firmness of massif rock make the hobboing cutter cutter ring in broken rock process, not only bear very big radial effect power, but also will stand the sharp wear of hard mineral facies in the rock, and cutter ring outside surface serious wear is also often ruptured.
At present, the 5Cr5MoSiV1 steel is to make hobboing cutter cutter ring material comparatively commonly used.This steel belongs to hot-work die steel, and therefore, the formulation of thermal treatment process has crucial influence to the wear resistance of cutter ring.Because the alloying element and the carbon content of this steel are all higher, behind forging rolling, all to carry out Spheroidizing Annealing and handle.The purpose of Spheroidizing Annealing is in order to obtain spherodized structure, and spherodized structure is a tissue the most stable in the steel, and this is because the unit volume interfacial area of globular carbide is minimum, thereby has lower interfacial energy.The carbide that a large amount of disperses distribute exists, and austenite crystal should not be grown up when making heating, allows the quenching temperature scope of broad, and the strain cracking tendency is little during quenching, can obtain only quenching structure.
Summary of the invention
The object of the present invention is to provide the isothermal spheroidizing method of a kind of shield cutter, utilized this technology can significantly improve the durability of hobboing cutter cutter ring with steel 5Cr5MoSiV1.
The objective of the invention is to realize through following approach: the isothermal spheroidizing technology of 5Cr5MoSiV1 steel is that steel is warming up to 860 ~ 900 ℃ of insulations 3 ~ 4 hours with stove; Air cooling to 720 ~ 750 ℃ insulation is 4 ~ 5 hours again, is chilled to the air cooling of coming out of the stove below 500 ℃ with stove at last.
The present invention can make a large amount of disperse distributions of 5Cr5MoSiV1 steel annealing back acquisition, size is even and the globular carbide particle of rounding, and is as shown in Figure 2.These carbide are that follow-up quench treatment provides a large amount of forming core cores, make that austenite crystal is difficult for growing up, and the tendency of strain cracking when having reduced to quench, thereby will significantly improve intensity, hardness and and other over-all propertieies of hobboing cutter cutter ring.
Description of drawings
Fig. 1 is the isothermal spheroidizing process schematic representation of 5Cr5MoSiV1 steel of the present invention.
Fig. 2 is a 5Cr5MoSiV1 steel isothermal spheroidizing technology microstructure synoptic diagram.
Embodiment
Like Fig. 1, shown in Figure 2, embodiment one, and the isothermal spheroidizing technology of 5Cr5MoSiV1 steel of the present invention is warming up to 860 ℃ of insulations 3 hours with steel with stove, and air cooling to 720 ℃ insulation is 4 hours again, is chilled to the air cooling of coming out of the stove below 500 ℃ with stove at last.
As shown in Figure 1, embodiment two, and the isothermal spheroidizing technology of 5Cr5MoSiV1 steel of the present invention is warming up to 880 ℃ of insulations 3.5 hours with steel with stove, and air cooling to 730 ℃ insulation is 4.5 hours again, is chilled to the air cooling of coming out of the stove below 500 ℃ with stove at last.
As shown in Figure 1, embodiment three, and the isothermal spheroidizing technology of 5Cr5MoSiV1 steel of the present invention is warming up to 900 ℃ of insulations 4 hours with steel with stove, and air cooling to 750 ℃ insulation is 5 hours again, is chilled to the air cooling of coming out of the stove below 500 ℃ with stove at last.
Claims (1)
1. a shield cutter is with the isothermal spheroidizing method of steel 5Cr5MoSiV1; Be that steel is warming up to 860 ~ 900 ℃ of insulations 3 ~ 4 hours with stove; Be chilled to the air cooling of coming out of the stove below 500 ℃ with stove, it is characterized in that: first air cooling to 720 ~ 750 ℃ insulation is 3 ~ 4 hours before the air cooling of coming out of the stove below 500 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110369261.7A CN102382949B (en) | 2011-11-21 | 2011-11-21 | A kind of isothermal spheroidizing method of shield cutter steel 5Cr5MoSiV1 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110369261.7A CN102382949B (en) | 2011-11-21 | 2011-11-21 | A kind of isothermal spheroidizing method of shield cutter steel 5Cr5MoSiV1 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102382949A true CN102382949A (en) | 2012-03-21 |
| CN102382949B CN102382949B (en) | 2015-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110369261.7A Active CN102382949B (en) | 2011-11-21 | 2011-11-21 | A kind of isothermal spheroidizing method of shield cutter steel 5Cr5MoSiV1 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1540001A (en) * | 2003-11-01 | 2004-10-27 | 湖南科技大学 | Isothermal spheroidizing technique for H13 steel |
| CN102206739A (en) * | 2011-05-04 | 2011-10-05 | 上海大学 | Dual-refinement treatment process of hot mould steel structure |
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2011
- 2011-11-21 CN CN201110369261.7A patent/CN102382949B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1540001A (en) * | 2003-11-01 | 2004-10-27 | 湖南科技大学 | Isothermal spheroidizing technique for H13 steel |
| CN102206739A (en) * | 2011-05-04 | 2011-10-05 | 上海大学 | Dual-refinement treatment process of hot mould steel structure |
Non-Patent Citations (1)
| Title |
|---|
| 李强: "热挤压模具钢的热处理工艺改进", 《热处理技术与装备》 * |
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| CN102382949B (en) | 2015-10-28 |
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Effective date of registration: 20190307 Address after: 330044 Jiaoqiao Town, Nanchang Economic and Technological Development Zone, Jiangxi Province Patentee after: Nanchang Gear Co., Ltd. shield cutting tool branch company Address before: 330000 999, Xuefu Avenue, Nanchang, Jiangxi. Patentee before: Nanchang University |