CN101899556B - Heat treatment method for thinning coarse grains of ferrite refractory steel for bearing pressure at high temperature - Google Patents
Heat treatment method for thinning coarse grains of ferrite refractory steel for bearing pressure at high temperature Download PDFInfo
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- CN101899556B CN101899556B CN2010102587676A CN201010258767A CN101899556B CN 101899556 B CN101899556 B CN 101899556B CN 2010102587676 A CN2010102587676 A CN 2010102587676A CN 201010258767 A CN201010258767 A CN 201010258767A CN 101899556 B CN101899556 B CN 101899556B
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Abstract
The invention relates to a heat treatment method for thinning coarse grains of ferrite refractory steel for bearing pressure at high temperature, belonging to the field of ferrous metallurgy. The method comprises the following steps of: firstly, heating and austenitizing a spare part before tempering heat treatment; then, precooling to 600-700 DEG C; keeping the temperature of 750+/-100 DEG C for 10 h and cooling in a furnace; or keeping the temperature of 760+/-10 DEG C for 10 h, then cooling to 740+/-10 DEG C, keeping the temperature for 10 h, cooling to 720+/-10 DEG C, keeping the temperature for 10 h and cooling in the furnace. Beginning from eliminating tissue transmissibility, the method is firstly used for austenitizing the spare part before normal heat treatment and then precooling and isothermally annealing or precooling and isothermally annealing in a step type to obtain tissues of ferrite and carbide so as to eliminate the tissue transmissibility and thin the coarse grains.
Description
Technical field
The present invention relates to a kind of heat treating method of thinning coarse grains of ferrite refractory steel for bearing pressure at high temperature, belong to the ferrous metallurgy field.
Background technology
Adopt to forge or pressing method produce high-temperature bearing with novel jessop such as weldless steel tube processes such as 10Cr9Mo1VNbN, 10Cr9MoW2VNbBN in; Because this type of steel grade alloying element content is high; Tissue heredity is strong, after forging of part process or the drawing extruding, directly carries out modified thermal treatment; Thick or the mixed crystal phenomenon of crystal grain often takes place, and does not meet technical standard order.
Summary of the invention
The object of the present invention is to provide a kind of heat treating method of thinning coarse grains of ferrite refractory steel for bearing pressure at high temperature, this method can be carried out effective refinement to forging or push the coarse grain that produces after the drawing.
Technical solution:
The present invention includes: forge or the extruding drawing after pipe, before the modified thermal treatment, earlier to part heating carrying out austenitizing, then after the precooling to 600 ℃-700 ℃, at 10 hours stove internal cooling of 750 ℃ ± 10 ℃ insulations.
The another kind of implementation method of the present invention comprises: the pipe after forging or the extruding drawing, before the modified thermal treatment, earlier to part heating carrying out austenitizing; After the precooling to 600 ℃-700 ℃,, be cooled to 740 ℃ ± 10 ℃ insulations 10 hours then then 760 ℃ ± 10 ℃ insulations 10 hours; Be cooled to 10 hours stove internal cooling of 720 ℃ ± 10 ℃ insulations again; Obtain the tissue that ferritic adds carbide, by the normal process modifier treatment, crystal grain gets final product refinement again.
The present invention sets about from eliminating tissue heredity, and before normal heat was handled, precooling added isothermal annealing after elder generation carried out austenitizing to part; Perhaps precooling adds two kinds of methods of step type isothermal annealing behind the austenitizing, all can obtain the tissue that ferritic adds carbide, eliminates tissue heredity, makes coarse grain fined.
Description of drawings
Fig. 1 is the normal hardening and tempering process graphic representation of 10Cr9Mo1VNbN, the standard code of 10Cr9MoW2VNbBN prior art;
Fig. 2 is precooling+isothermal annealing process curve figure behind the austenitizing of 10Cr9Mo1VNbN of the present invention;
Fig. 3 is the step type annealing process curve figure of precooling+several isothermal behind the austenitizing of 10Cr9MoW2VNbBN of the present invention-cooling combination.
Embodiment
Referring to Fig. 2, Fig. 3, the present invention for forge or the extruding drawing after pipe, under 1000 ℃-1100 ℃, carry out austenitizing, then after the precooling to 600 ℃-700 ℃, at 10 hours stove internal cooling of 750 ℃ of insulations; Or, be cooled to 740 ℃ of insulations 10 hours then 760 ℃ of insulations 10 hours, and be cooled to 10 hours stove internal cooling of 720 ℃ of insulations again, obtain the tissue that ferritic adds carbide, by the normal process modifier treatment, crystal grain gets final product refinement again.
New type high temperature ferrite refractory steel for bearing pressure such as 10Cr9Mo1VNbN, 10Cr9MoW2VNbBN etc. that the north, Inner Mongol heavy industry group company produces; Carry out modified thermal treatment after forging or the extrusion molding; Find nearly hundred thick or mixed crystal of steel pipe crystal grain, can not satisfy the relevant criterion technical requirements.And through various annealing, normalizing, that thermal treatment process such as modified all can't be handled is qualified.
For the underproof 10Cr9Mo1VNbN pipe of grain fineness number occurring; After forging or extrusion molding; Precooling adds isothermal annealing technology after carrying out austenitizing, and it is modified to press Fig. 1 technology again, can solve that pipe forges or the extruding drawing after the problem of the thick or mixed crystal of the crystal grain that produces.It is all qualified to prop up the 10Cr9Mo1VNbN pipe by above-mentioned art breading hundreds of.
For the underproof 10Cr9MoW2VNbBN pipe of grain fineness number occurring; After forging or extrusion molding; Precooling adds step type isothermal annealing technology after carrying out austenitizing, and it is modified to press Fig. 1 technology again, can solve that pipe forges or the extruding drawing after the problem of the thick or mixed crystal of the crystal grain that produces.All qualified by nearly hundred 10Cr9MoW2VNbBN pipes of above-mentioned art breading.
Claims (2)
1. the heat treating method of thinning coarse grains of ferrite refractory steel for bearing pressure at high temperature; Comprise: with high-temperature bearing forge with jessop 10Cr9Mo1VNbN or 10Cr9MoW2VNbBN or the extruding drawing after pipe; It is characterized in that before the modified thermal treatment, part carries out austenitizing under 1000 ℃-1100 ℃; Air cooling is to 600-700 ℃ of temperature, at 10-15 hour stove internal cooling of 750 ℃ ± 10 ℃ insulations then.
2. the heat treating method of thinning coarse grains of ferrite refractory steel for bearing pressure at high temperature comprises: with high-temperature bearing forge with jessop 10Cr9Mo1VNbN or 10Cr9MoW2VNbBN or the extruding drawing after pipe, it is characterized in that; Before the modified thermal treatment, part carries out austenitizing under 1000 ℃-1100 ℃, and air cooling is to 600-700 ℃ of temperature then; 10-15 hour stove internal cooling of 760 ℃ ± 10 ℃ insulations; Be cooled to 10-15 hour stove internal cooling of 740 ℃ ± 10 ℃ insulations, be cooled to 10-15 hour stove internal cooling of 720 ℃ ± 10 ℃ insulations again, obtain the tissue that ferritic adds carbide; By the normal process modifier treatment, crystal grain gets final product refinement again.
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| CN2010102587676A CN101899556B (en) | 2010-08-11 | 2010-08-11 | Heat treatment method for thinning coarse grains of ferrite refractory steel for bearing pressure at high temperature |
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| CN2010102587676A CN101899556B (en) | 2010-08-11 | 2010-08-11 | Heat treatment method for thinning coarse grains of ferrite refractory steel for bearing pressure at high temperature |
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| CN101899556B true CN101899556B (en) | 2012-07-04 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102643962B (en) * | 2012-05-14 | 2013-05-29 | 南京钢铁股份有限公司 | Heat treatment technology for rapid annealing of steel T91 |
| CN103555905B (en) * | 2013-10-24 | 2015-07-01 | 钢铁研究总院 | Method for obtaining ferritic heat-resisting steel with the characteristic of austenite structure |
| CN103773931B (en) * | 2014-02-20 | 2015-07-22 | 内蒙古北方重工业集团有限公司 | Heat treatment method for eliminating residual stress of hollow long and thin parts |
| CN103773934B (en) * | 2014-02-20 | 2015-07-22 | 内蒙古北方重工业集团有限公司 | Thermal treatment method for eliminating structural heredity of high-toughness steel |
| CN104451100B (en) * | 2014-11-29 | 2016-08-17 | 攀钢集团成都钢钒有限公司 | A kind of seamless steel pipe heat treatment method |
| CN108220561A (en) * | 2017-10-24 | 2018-06-29 | 常州天山重工机械有限公司 | A kind of method for refining 20CrMoA forging autstenitic grain sizes |
| CN108315535B (en) * | 2018-01-11 | 2020-03-24 | 通裕重工股份有限公司 | After-forging heat treatment process for 12Cr2Mo1V hydrogenation reactor forge piece |
| CN108950148B (en) * | 2018-07-30 | 2020-07-21 | 钢铁研究总院 | Method for improving radial structure and performance uniformity of G115 steel large-caliber thick-wall pipe |
| CN109402365A (en) * | 2018-12-21 | 2019-03-01 | 扬州龙川钢管有限公司 | A kind of conditioning treatment process solving T/P91, T/P92 mixed grain structure |
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| US5424028A (en) * | 1993-12-23 | 1995-06-13 | Latrobe Steel Company | Case carburized stainless steel alloy for high temperature applications |
| JPH1180903A (en) * | 1997-09-08 | 1999-03-26 | Nkk Corp | High strength steel member excellent in delayed fracture characteristic, and its production |
| CN100392120C (en) * | 2005-07-29 | 2008-06-04 | 上海汽轮机有限公司 | Subcritical steam turbine bolting steel fine grain processing method |
| CN100419094C (en) * | 2005-10-25 | 2008-09-17 | 北京机电研究所 | Process for removing mixed crystal defect of large rotor forging |
| CN101597682B (en) * | 2009-07-09 | 2013-01-23 | 贵州大学 | Process for ultrafining heat-treatment on crystal grains of axle steel |
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