CN101748252A - Hot working process for high-nitrogen austenitic stainless steel - Google Patents
Hot working process for high-nitrogen austenitic stainless steel Download PDFInfo
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- CN101748252A CN101748252A CN200810229514A CN200810229514A CN101748252A CN 101748252 A CN101748252 A CN 101748252A CN 200810229514 A CN200810229514 A CN 200810229514A CN 200810229514 A CN200810229514 A CN 200810229514A CN 101748252 A CN101748252 A CN 101748252A
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Abstract
The invention relates to the field of hot working processes, in particular to a hot working process for obtaining high-nitrogen austenitic stainless steel with high strength, high plasticity and single austenitic structure, and particularly provides a hot working process for high-nitrogen austenitic stainless steel with the nitrogen content of above 0.45 percent by weight. The process comprises: heating high-nitrogen austenitic stainless steel to 1,200+/-10 DEG C; preserving heat for 10 to 30 minutes; performing multi-pass rolling and controlling the amount of pass rolling reduction; controlling the finishing rolling temperature at 1,050+/-20 DEG C; quickly cooling the obtained product; and obtaining the high-nitrogen austenitic stainless steel with single austenitic structure, high strength and high plasticity. Through a reasonable thermal-deformation process, the high-nitrogen austenitic stainless steel which has high yield strength and high tensile strength and also maintains high plasticity can be directly rolled with no subsequent heat treatment. Meanwhile, the process can also be used in the hot-working molding of the high-nitrogen austenitic stainless steel with different nitrogen content hot-working molding and other fields of industrial production, and solves the problem of forming precipitated phase and then deformation and cracking and the like in the hot working process.
Description
Technical field:
The present invention relates to the heat processing technique field, be specially a kind of heat processing technique that obtains high strength, high-ductility and single austenite structure high-nitrogen austenitic stainless steel, it is the heat processing technique of the above high-nitrogen austenitic stainless steel of 0.45wt% that nitrogen content is provided especially.
Background technology:
The mechanical property of high-nitrogen austenitic stainless steel excellence, structure stability and corrosion resistance nature make it become the boundless novel ferrous materials of a kind of application prospect.At present, the generator amature retaining ring is used widely in developed country with high-nitrogen austenitic stainless steel.
Usually, the final performance of composition and organization decided metallic substance, under the certain situation of composition, it is important unusually that organizational controls just seems.The material of composition of the same race obtains different tissues by process means, and the performance of final material can change within a large range.And thermal distortion is the important step of formed product, organizational controls, defective control, performance adjustment.The thermal distortion link is controlled improper meeting and is caused material to ftracture in thermal deformation process such as forging, rolling, or occurs that crystal grain is thick, carbonitride is separated out etc. to the disadvantageous problem of material property.
In the high-nitrogen austenitic stainless steel solid solution a large amount of nitrogen-atoms, nitrogen-atoms stops the dynamic recrystallization in the materials hot deformation process, so the thermal distortion drag is very high, common thermal distortion equipment is difficult to meet the demands.Another problem in the high-nitrogen austenitic stainless steel thermal deformation process is the material cracking.Because high-nitrogen austenitic stainless steel is easy to form the thermoplastic precipitated phases of infringement material at high temperature such as nitride, intermetallic compound under 800～1000 ℃ of high temperature, and thermal distortion can promote the formation of precipitated phase.Therefore, how avoiding precipitated phase and then avoid strain cracking in hot procedure is the problem that thermal distortion technology must be considered, also is that can the decision high-nitrogen austenitic stainless steel in the important factor of industrial widespread use.
The key of avoiding high-nitrogen austenitic stainless steel precipitated phase to occur in thermal deformation process is beginning temperature, deflection, end temp and the speed of cooling subsequently of controlled deformation.The beginning temperature is too high can to form the delta ferrite tissue, and end temp is crossed to hang down and can be separated out carbonitride and intermetallic compound etc., and speed of cooling is crossed slowly also can cause separating out of nitride.Therefore, after hot-work, to carry out solution treatment in various degree usually, thereby eliminate nitride or the ferrite that in hot procedure, produces.
Summary of the invention:
The object of the present invention is to provide a kind of heat processing technique that obtains high strength, high-ductility and single austenite structure high-nitrogen austenitic stainless steel, solution forms problems such as precipitated phase and then strain cracking in hot procedure, adopt the heat processing technique of the present invention's design, can obtain to be organized as single austenitic structure, and have the high-nitrogen austenitic stainless steel of high strength, high-ductility.
Technical scheme of the present invention is:
A kind of heat processing technique of high-nitrogen austenitic stainless steel, concrete steps are as follows:
High-nitrogen austenitic stainless steel is heated to 1200 ± 10 ℃, be incubated after 10～30 minutes, finally require size design according to product, rolling through multi-pass, the control finishing temperature is at 1050 ± 20 ℃, water-cooled then, thus obtain to be organized as single austenitic structure, and have the high-nitrogen austenitic stainless steel of high strength, high-ductility.
When rolling, draught per pass is 20%-30%, after 4 passages are rolling, makes the accumulative total deflection of material surpass 70%, finally guarantees finishing temperature at 1050 ± 20 ℃, makes the material recrystallize abundant, and makes crystal grain obtain refinement.
The present invention is applicable to that nitrogen content is that the above Fe-Cr-Mn-Mo of 0.45wt% is a high-nitrogen austenitic stainless steel.
Beneficial effect of the present invention is as follows:
1, the present invention is by rational thermal distortion technology, adjustment by processing parameters such as Heating temperature, rolling temperature, rolling pass, finishing temperature and speed of cooling, can directly roll out without subsequent heat treatment and have higher yield strength, tensile strength and work hardening rate, the high-nitrogen austenitic stainless steel that keeps high-ductility simultaneously, under the situation that guarantees high-nitrogen austenitic stainless steel yield strength, tensile strength code requirement, unit elongation can improve 20-30%.Thereby, for enterprise saves production cost and enhances productivity.
2, the present invention can be used for the industrial production fields such as thermo forming that nitrogen content is 0.45～2.0% high-nitrogen austenitic stainless steel, this invention can be shortened the materials processing molding time for factory, only can obtain the high-nitrogen austenitic stainless steel of arbitrary dimension and excellent performance by hot-work.Simultaneously, this invention is suitable for being used for eliminating the thick nitride or the ferritic structure of separating out on the crystal boundary, also can be used for improving homogeneity of structure, the thick tissue after the processing of foundry goods homogenizing and the various overheated structures etc. of open die forgings.
Description of drawings
The microstructure of Fig. 1 material under different hot-work conditions; Wherein, (a) 1#, (b) 2#, (c) 3#, (d) 4#.
The mechanical property of Fig. 2 material under different hot-work conditions; Wherein, (a) 1#, (b) 2#, (c) 3#, (d) 4#.
Embodiment
Embodiment 1
Utilizing the present invention is that 0.52% high-nitrogen austenitic stainless steel has carried out experimental study to nitrogen content, and (wt%) is as follows for the chemical ingredients of material: C:0.04, Cr:18.57, Mn:15.56, Mo:2.46, N:0.52, Fe surplus.
Adopt nitrogen protection induction melting and nitrogen protection electric slag refusion and smelting high-nitrogen austenitic stainless steel experiment material; ingot casting forges into several piece 200 * 70 * 40 (long * wide * thick) mm forging stock material through cogging, homogenizes through 1200 ℃ and forges into the experiment materials after handling.
Forging stock was heated to 1200 ℃ of insulations after 30 minutes, by changing the finishing temperature and the type of cooling forging stock is hot-rolled down to the 12mm thick blanks, the rolling technology of forging stock sees Table 1.
The thermal process parameter of table 1 experiment material
The final metallographic structure of 4 kinds of technology as shown in Figure 1.The different microstructures that different rolling technological parameters obtain in the comparison diagram 1 as can be seen, finishing temperature, the type of cooling have remarkably influenced to material room temperature texture.Have micro-banded structure in the 1# steel, the austenite crystal recrystallize is more abundant; And the 3# steel is incomplete recrystallized austenite structure, and the austenite crystal shape is very irregular; Have tangible banded structure in the 4# steel, second of the inhomogeneity of structure of these three kinds of materials and generation all need could be eliminated by solution treatment once more mutually fully; And the material that rolls out by 2# technology is because the finishing temperature height, and it is very fast that recrystallize carries out, and crystal grain is the austenite equiax crystal; Simultaneously, because the quick cooling after rolling has stoped proceeding of recrystallize, has higher twin density.Therefore,, can obtain to be organized as the high-nitrogen austenitic stainless steel of single austenitic structure, shown in Fig. 1 (b) by heat processing technique set forth in the present invention.
The final mechanical property of 4 kinds of materials that technology obtains as shown in Figure 2.As shown in Figure 2, behind the 2# heat processing technique that employing the present invention proposes, the intensity of material is under the prerequisite that keeps higher level, and its plasticity is significantly improved.
Embodiment result shows, at nitrogen content is high-nitrogen austenitic stainless steel more than the 0.45wt%, can directly roll out high-yield strength, tensile strength without subsequent heat treatment by the present invention, keep high-ductility simultaneously and have the high-nitrogen austenitic stainless steel of single austenite structure, finally the production efficiency that saves production cost and improve material for enterprise.
Claims (2)
1. the heat processing technique of a high-nitrogen austenitic stainless steel, it is characterized in that: high-nitrogen austenitic stainless steel is heated to 1200 ± 10 ℃, be incubated after 10～30 minutes, finally require size design according to product, rolling through multi-pass, control finishing temperature at 1050 ± 20 ℃, then water-cooled, thereby obtain to be organized as single austenitic structure, and have the high-nitrogen austenitic stainless steel of high strength, high-ductility.
2. according to the heat processing technique of the described high-nitrogen austenitic stainless steel of claim 1, it is characterized in that: when rolling, draught per pass is 20%-30%, after 4 passages are rolling, make the accumulative total deflection of material surpass 70%, thereby when guaranteeing finishing temperature, make the material recrystallize abundant, and make crystal grain obtain refinement.
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| CN200810229514A CN101748252A (en) | 2008-12-10 | 2008-12-10 | Hot working process for high-nitrogen austenitic stainless steel |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103627867A (en) * | 2013-10-30 | 2014-03-12 | 丹阳市华龙特钢有限公司 | Manufacturing method of stainless steel boards |
| CN107604129A (en) * | 2017-09-01 | 2018-01-19 | 中原特钢股份有限公司 | Suppress the cooling means of big specification high-nitrogen austenitic stainless steel grain boundary precipitate |
| CN111961989A (en) * | 2020-08-05 | 2020-11-20 | 广西柳钢中金不锈钢有限公司 | Method for manufacturing high-nitrogen low-nickel copper-free austenitic stainless steel |
| CN112974532A (en) * | 2021-02-05 | 2021-06-18 | 山西太钢不锈钢股份有限公司 | Rolling method of ultrahigh nitrogen austenitic stainless steel hot continuous rolling coiled plate |
| CN114410934A (en) * | 2022-01-25 | 2022-04-29 | 太原科技大学 | Method for refining coarse columnar crystal structure of electroslag remelting retaining ring steel |
-
2008
- 2008-12-10 CN CN200810229514A patent/CN101748252A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103627867A (en) * | 2013-10-30 | 2014-03-12 | 丹阳市华龙特钢有限公司 | Manufacturing method of stainless steel boards |
| CN107604129A (en) * | 2017-09-01 | 2018-01-19 | 中原特钢股份有限公司 | Suppress the cooling means of big specification high-nitrogen austenitic stainless steel grain boundary precipitate |
| CN111961989A (en) * | 2020-08-05 | 2020-11-20 | 广西柳钢中金不锈钢有限公司 | Method for manufacturing high-nitrogen low-nickel copper-free austenitic stainless steel |
| CN111961989B (en) * | 2020-08-05 | 2022-06-03 | 广西柳钢中金不锈钢有限公司 | Method for manufacturing high-nitrogen low-nickel copper-free austenitic stainless steel |
| CN112974532A (en) * | 2021-02-05 | 2021-06-18 | 山西太钢不锈钢股份有限公司 | Rolling method of ultrahigh nitrogen austenitic stainless steel hot continuous rolling coiled plate |
| CN114410934A (en) * | 2022-01-25 | 2022-04-29 | 太原科技大学 | Method for refining coarse columnar crystal structure of electroslag remelting retaining ring steel |
| CN114410934B (en) * | 2022-01-25 | 2023-12-01 | 太原科技大学 | Method for refining coarse columnar crystal structure of electroslag remelting guard ring steel |
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Open date: 20100623 |