CN102091751B - Control method for 316 LN steel heavy-forging crystalline grain - Google Patents
Control method for 316 LN steel heavy-forging crystalline grain Download PDFInfo
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- CN102091751B CN102091751B CN 201010577477 CN201010577477A CN102091751B CN 102091751 B CN102091751 B CN 102091751B CN 201010577477 CN201010577477 CN 201010577477 CN 201010577477 A CN201010577477 A CN 201010577477A CN 102091751 B CN102091751 B CN 102091751B
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Abstract
The invention discloses a control method for the 316 LN steel heavy-forging forging crystalline grain, belonging to the technical field of the heavy-forging forging of austenitic stainless steel. A steel ingot is forged by 1-n heating numbers based on the prior art of the initial forging temperature Ti of 1200+/-10DEG C and the finish forging temperature Tf of 925+/-25DEG C; cogging and initial forging are carried out by the working procedures such as chamfering, rounding as a ball, upsetting, drawing and the like; and the granularity of the crystalline grain in a forging stock reaches about level 1. The control method is characterized in that the initial forging temperature is changed as follows: Tc=1075+/-25DEG C during subsequent (n+1)-(n+3) heating numbers, and the finish forging temperature is still kept as follows: Tc=925+/-25DEG C; then the foraging stock is forged and shaped; the total deformation amount in the foraging process is kept at 60%; and the deformation amount of each heating number is respectively 20-30%. The control method has the advantage that the forging crystalline grain can be further refined, and the granularity reaches level 3-level 4.
Description
Technical field
The invention belongs to austenitic stainless steel large forgings technical field of forging, be specifically related to a kind of 316LN steel heavy forging and forge the grain size control method.
Technical background
The API1000 nuclear power technology is most advanced, safest third generation nuclear power technology at present.The hot branch road trunk line of coupled reaction device and steam generator is made with the 316LN steel in this technology.This forging weighs 56 tons, and grain size number requires to reach 3～4 grades.At present, be flat-die forging for what forge this austenitic stainless steel large forgings employing both at home and abroad.The formulation of Forging Technology is normally determined its forging temperature interval according to phasor, thermoplasticity figure and the overtemperature of steel grade, namely determines its initial forging temperature T
i=1200 ℃ ± 10 ℃, final forging temperature is T
f=925 ℃ ± 25 ℃; Determine total forging ratio according to forging with the weight of steel ingot, the geomery of forging and the specification requirement of forging again; Forge theory according to large forgings at last, determine forging times and operation, and the branch forging ratio of each operation, as shown in table 1.
(n is positive integer to table 1, T
i=1200 ℃ ± 10 ℃, T
f=925 ℃ ± 25 ℃)
| Fire | 1～n | (n+1)～(n+3) |
| The forging temperature interval | T i～T f | T i～T f |
| Operational sequence and deformation process | Chamfered edge, round as a ball; Jumping-up, pulling | Jumping-up, pulling are shaped |
| Forging ratio (deflection) | k 1～k n | k n+1～k n+3 |
| Forge grain size number | About 1 grade | About 1 grade |
Mainly be to have considered the improvement of steel ingot as-cast structure and the requirement of forging property in the above-mentioned conventional forging process, forge grain size and can only reach about 1 grade, and mixed crystal problem is also relatively more serious, the requirement that does not reach the forging grain size 3～4 described in the present invention.
Summary of the invention
The present invention seeks to the requirement at 3～4 grades of 316LN steel heavy forging grain sizes, consider the inferior rule that influences to forging inside grain growth of temperature, deflection and fire in forging process, and provide a kind of existing Forging Technology is optimized and improves, make forging crystal grain realize thin homogenize and reach 3～4 grades method.
The present invention is achieved in that it is at first to adopt initial forging temperature T
i=1200 ℃ ± 10 ℃, final forging temperature T
f=925 ℃ ± 25 ℃ prior art is carried out 1～n fire to steel ingot and is forged, through chamfered edge, round as a ball, the cogging of operations such as jumping-up and pulling and just forging is eliminated and has been improved as-cast structure, it is saturating that steel ingot has been carried out abundant forging, and the inner grain size of forging stock is reached about 1 grade.Then, in the control of follow-up forging and molding operation implementation grain structure, namely when follow-up (n+1)～(n+3) fire is inferior, change initial forging temperature into T
c=1075 ℃ ± 25 ℃, final forging temperature still is T
f=925 ℃ ± 25 ℃, again forging stock is carried out forging and molding, requiring total deformation in the forging process is 60%, the inferior deflection of each fire is respectively 20%～30%.
Advantage of the present invention and good effect are to make the inner further refinement of crystal grain of forging and homogenising, and grain size number reaches 3～4 grades.
The specific embodiment
As shown in table 2, the 316LN steel ingot forged be example.
Table 2
Claims (1)
1. a 316LN steel heavy forging forges the crystal grain control method, and it is to adopt initial forging temperature T
i=1200 ℃ ± 10 ℃, final forging temperature T
f=925 ℃ ± 25 ℃ prior art is carried out 1～n fire to steel ingot and is forged, through chamfered edge, round as a ball, the cogging of jumping-up and pulling operation and forging just, the inner grain size of forging stock is reached about 1 grade, it is characterized in that carrying out in follow-up forging and molding operation the control of grain structure, namely when follow-up (n+1)～(n+3) fire is inferior, change initial forging temperature into T
c=1075 ℃ ± 25 ℃, final forging temperature still is T
f=925 ℃ ± 25 ℃, again forging stock is carried out forging and molding, requiring total deformation in the forging process is 60%, the inferior deflection of each fire is respectively 20%～30%.
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| CN 201010577477 CN102091751B (en) | 2010-12-03 | 2010-12-03 | Control method for 316 LN steel heavy-forging crystalline grain |
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| CN 201010577477 CN102091751B (en) | 2010-12-03 | 2010-12-03 | Control method for 316 LN steel heavy-forging crystalline grain |
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| CN102091751A CN102091751A (en) | 2011-06-15 |
| CN102091751B true CN102091751B (en) | 2013-08-21 |
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| CN102357626B (en) * | 2011-08-27 | 2013-06-26 | 江阴振宏重型锻造有限公司 | Method for forging and pressing semi-coupler with large section and high height-diameter ratio by using 31.5 MN of oil press |
| CN103194581A (en) * | 2013-04-11 | 2013-07-10 | 太原钢铁(集团)有限公司 | Control method of austenitic stainless steel large forging structure for nuclear reactor |
| CN103192013A (en) * | 2013-04-15 | 2013-07-10 | 太原科技大学 | Method for controlling forging state 316LN steel forging crack initiation |
| CN104174796B (en) * | 2014-08-08 | 2016-01-20 | 东北大学 | A kind of production method of thermonuclear fusion heap stainless steel heavy forging |
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| CN104722702B (en) * | 2014-11-14 | 2015-10-28 | 上海新闵（东台）重型锻造有限公司 | Supercritical unit high temperature steam pipeline forging molding process |
| CN104630437B (en) * | 2015-01-21 | 2016-09-21 | 山西太钢不锈钢股份有限公司 | A kind of station boiler manufacture method of the heat-resisting pipe of big specification |
| CN104624892B (en) * | 2015-02-05 | 2016-08-24 | 北京科技大学 | A kind of method refining AP1000 Nuclear power plant main pipeline forging ozzle position crystal grain |
| CN104726660A (en) * | 2015-03-13 | 2015-06-24 | 上海交通大学 | Forging method for increasing corrosion resistance of 316 LN stainless steel |
| CN106048157A (en) * | 2016-06-30 | 2016-10-26 | 安徽省瑞杰锻造有限责任公司 | Method for forging 316LN stainless steel forge piece |
| CN105935738B (en) * | 2016-06-30 | 2017-12-01 | 安徽省瑞杰锻造有限责任公司 | A kind of forging technology of ledeburite steel shaft |
| CN108048756A (en) * | 2017-06-16 | 2018-05-18 | 大连大学 | The method for refining SUS316 alloy structure crystal grain |
| CN107470528B (en) * | 2017-08-04 | 2019-02-01 | 钢铁研究总院 | A kind of forging method that nuclear power is refined with the steel heavy forging center position SA508Gr.4N |
| CN108396125B (en) * | 2018-04-23 | 2019-08-30 | 洛阳Lyc轴承有限公司 | A kind of processing technology of carburizing steel railway bearing forging crystal grain refinement |
| CN111485085B (en) * | 2020-05-22 | 2021-11-30 | 无锡派克新材料科技股份有限公司 | Method for improving grain growth resistance of 18CrNiMo7-6 alloy at 930-950 DEG C |
| CN113552029B (en) * | 2021-06-30 | 2022-09-30 | 太原科技大学 | Wide-universality austenite mixed crystal evaluation method |
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Effective date of registration: 20200731 Address after: 035404 Shenshan Xiang Guan Guan Ying Cun, Dingxiang County, Xinzhou City, Shanxi Province Patentee after: Shanxi Zhonggong Heavy Forging Co., Ltd Address before: 030024 Taiyuan City, Shanxi Province Wan Road, No. 66, No. Patentee before: TAIYUAN University OF SCIENCE AND TECHNOLOGY |
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