CN102554570B - Manufacturing method for non-magnetic stainless steel adapter lug - Google Patents
Manufacturing method for non-magnetic stainless steel adapter lug Download PDFInfo
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- CN102554570B CN102554570B CN201110458608.5A CN201110458608A CN102554570B CN 102554570 B CN102554570 B CN 102554570B CN 201110458608 A CN201110458608 A CN 201110458608A CN 102554570 B CN102554570 B CN 102554570B
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Abstract
The invention relates to metallurgy, in particular to a manufacturing method for a non-magnetic stainless steel adapter lug. The manufacturing method mainly comprises an ultra-pure purification smelting process of a non-magnetic stainless steel bar ingot, a forging ejection and hot rolling process of a steel bar, a solid solution thermal treatment process of the steel bar and a coreless grinding, polishing and threaded rolling process of the steel bar, wherein EF and AOD (Electric Furnace and Argon Oxygen Decarburizing Furnace) smelting is adopted in the ultra-pure purification smelting, and molten steel is purified through a plurality of slag rake processes, so that non-metal inclusions, harmful elements and harmful gases are strictly controlled; during forging, the forging ratio is greater than or equal to 3, the hot rolling extension ratio is greater than or equal to 5, and the screw strength and toughness are improved by grain refinement; the degree of finish Ra is further increased to be less than or equal to 0.8 through the coreless grinding and polishing; the corrosion resistance capacity of the screw is improved; the thread machining is changed from cutting machining into wire rolling mill wire rolling; the screw fiber is prevented from being cut off; the reliability of the screw is improved; the service life of the screw is prolonged; and the technical conditions of the 1,100 MW nuclear power non-magnetic stainless steel feed-through screw are met.
Description
Technical field
the present invention relates to metallurgical class, particularly a kind of manufacture method of magnetism-free stainless steel core through screw rod.
Background technology
the production of non-magnetic rustproof Steel material does not all have standard with the world at home, adopts general stainless steel art, method to can not produce this kind of material.The manufacture method of the magnetism-free stainless steel core through screw rod of a kind of 600MW of being applicable to, 1000MW thermal power generation is disclosed in patent " manufacture method of magnetism-free stainless steel core through screw rod " (patent No.: ZL200410018498.0), but along with the development of modern science and technology, there is the nuclear power generation that generating efficiency is higher.If Yangjiang 1100MW nuclear power is China's seat of honour mega kilowatt nuclear power generators, need 1100MW nuclear power magnetism-free stainless steel core through screw rod, previously be applicable to 600MW, although the magnetism-free stainless steel core through screw rod material of 1000MW thermal power generation is identical, but technology and the mechanical property of 1100MW nuclear power magnetism-free stainless steel core through screw rod to screw rod all has higher requirement, the core through screw rod life-span in particular for nuclear power needs 60 years, and thermoelectricity only needs 40 years service life, requirements for life has improved 50%, prior art obviously cannot meet the requirement of nuclear power, therefore in the urgent need to a kind of, can manufacture the more method of the magnetism-free stainless steel core through screw rod in high strength life-span in the industry.
Summary of the invention
the present invention is according to the deficiencies in the prior art part, a kind of manufacture method of magnetism-free stainless steel core through screw rod is provided, the method is by selected high duty alloy element and ecosystem steel scrap, chemical analysis is optimized combination, adopt peculiar process, improved the mechanical property of core through screw rod and greatly extended its service life.
object of the present invention realizes and being completed by following technical scheme:
a manufacture method for magnetism-free stainless steel core through screw rod, mainly comprises nonmagnetic stainless steel bar steel ingot ultra-pure purification melting manufacture, the forging ejection hot rolling of rod iron, heat treatment and the machined of rod iron, it is characterized in that:
(1) described rod iron steel ingot selects alloying element and steel scrap to carry out the external refining of electric furnace+aod in ultra-pure purification melting manufacture, and each weight percentages of components that described alloying element and described steel scrap are optimized after combination is: C 0.11 ~ 0.14%, Si 0.40 ~ 0.60%, Mn 11.00 ~ 14.00%, Cr 16.50 ~ 19.00%, Ni 0.50 ~ 2.50%, N 0.20 ~ 0.45, all the other are Fe;
(2) rod iron is forging in ejection course of hot rolling, forging ratio>=3, hot rolling ratio of elongation>=5;
(3) rod iron is placed on shaft furnace burner hearth and hits exactly and carry out solution heat treatment in heat treatment process;
(4) machined of rod iron comprises centreless grinding, polishing and the screw thread operation of rolling.
each weight percentages of components that described alloying element and described steel scrap are optimized after combination is: C 0.12 ~ 0.14%, Si 0.40 ~ 0.60%, Mn 12.5.00 ~ 13.60%, Cr 16.50 ~ 18.20%, Ni 2.00 ~ 2.45%, N 0.25 ~ 0.44, all the other are Fe.
the described shaft furnace degree of depth is not less than 1.5 times of described magnetism-free stainless steel core through screw rod length.
dye penetrant inspection is carried out on described magnetism-free stainless steel core through screw rod surface, thoroughly to remove described screw surface micro-crack.
after described magnetism-free stainless steel core through screw rod machined, carry out oscillating aging processing, to remove residual stress.
described magnetism-free stainless steel core through screw rod two ends screw thread wire rolling mill rolling, and do not cut off the fiber of described magnetism-free stainless steel core through screw rod.
the present invention compared with prior art, has the following advantages: intensity is high, good toughness, and corrosion resistance is strong, and the life-span is long, is applicable to 1100MW nuclear power generation, meets 60 year service life of nuclear power requirement.
Accompanying drawing explanation
fig. 1 is alloying element optimum organization table of the present invention;
fig. 2 is non-metallic inclusion content of the present invention control table;
fig. 3 is pernicious gas content of the present invention control table;
fig. 4 is harmful element content of the present invention control table.
The specific embodiment
below in conjunction with accompanying drawing, by embodiment, feature of the present invention and other correlated characteristics are described in further details, so that the understanding of colleague's ordinary artisan:
the concrete manufacture method of the present embodiment mainly comprises the ultra-pure purification fusion process of nonmagnetic stainless steel bar steel ingot, forging course of hot rolling, the heat treatment process of rod iron and the machining process Four processes of rod iron of rod iron.
in the ultra-pure purification fusion process of rod iron steel ingot:
(1) the selected high duty alloy element of 1Cr18Mn12NiN and ecosystem steel scrap, from clean molten steel, (ecosystem steel scrap is directly to select steel mill's leftover pieces, this steel scrap does not enter society, steel scrap cleaning, pollution-free, without greasy, the rare purification of molten steel that is beneficial to of impurity)
(2) as shown in Figure 1, alloying element is through optimum organization, intensified element C, Mn, Ni, N capping, and hazardous elements S, P, Cu remove the limit as far as possible low, improve mechanical property.
(3) as shown in Figure 2,3, 4, select electric furnace+aod external refining (being the refining of EF+AOD stove), at the heat of oxidation, reduction period secondary rake slag, to reduce non-metallic inclusion, pernicious gas and harmful element are strictly controlled in application AOD vacuum outgas, purify hot metal, improves service life.
(4) clean steel stove burner hearth and steamed stuffed bun, avoid the remaining molten steel of stove to enter, the polishing of trimming steamed stuffed bun die cavity, dries hot-die chamber and pours into a mould and add a cover exothermic riser, to make steel ingot feeding abundance, inherent quality is good, and utilization rate is high.
in the forging course of hot rolling of rod iron: strengthening forging ratio increases hot rolling ratio of elongation, crystal grain thinning improves intensity and toughness.Surface of steel ingot trimming polishing, forges ejection, forging ratio >=3, hot rolling ratio of elongation >=5.Metallographic structure is even, and crystal grain thinning improves intensity, improves toughness.
in the heat treatment process of rod iron: adopt ultradeep well formula stove, the degree of depth is 1.5 times of spiro rod length, screw rod is placed in the middle of shaft furnace, (because of shaft furnace upper end temperature drift, lower end is on the low side) carry out solution heat treatment, insulation fully, makes its metallographic structure even, improve mechanical property and sample from screw rod two ends simultaneously, two ends are all qualified just qualified.
in the machining process of rod iron:
(1) screw rod is through centreless grinding and polishing, and roughness is increased to Ra≤0.8 from Ra≤3.2, and bright and clean better, resistance to corrosion is better, and be improved service life.
(2) screw surface is all carried out dye penetrant inspection, thoroughly removes crizzle, improves its reliability.
(3) after machined, carry out ageing device vibration test and remove residual stress, improve service life.
(4) screw rod two ends screw thread wire rolling mill rolling, replaces turning to avoid screw rod fiber to be cut off, and improves service life.
the present embodiment is by selected high duty alloy element and ecosystem steel scrap, and chemical analysis is optimized combination, and harmful element, gas and non-metallic inclusion, raising Molten Steel Cleanliness are strictly controlled in ultra-pure purification melting.Strengthen forging ratio, hot rolling ratio of elongation, crystal grain thinning, raising intensity and toughness.The solution heat treatment of ultradeep well formula stove, makes its metallographic structure homogenising, improves mechanical property, and further centreless grinding and polishing, improves fineness, improves corrosion resistance.Screw rod two ends screw thread, rolls silk with wire rolling mill and replaces turning, avoids screw rod fiber to be cut off and improves reliability and service life.
Claims (6)
1. a manufacture method for magnetism-free stainless steel core through screw rod, mainly comprises nonmagnetic stainless steel bar steel ingot ultra-pure purification melting manufacture, the forging ejection hot rolling of rod iron, heat treatment and the machined of rod iron, it is characterized in that:
(1) described rod iron steel ingot selects alloying element and steel scrap to carry out the external refining of electric furnace+aod in ultra-pure purification melting manufacture, and each weight percentages of components that described alloying element and described steel scrap are optimized after combination is: C 0.11 ~ 0.14%, Si 0.40 ~ 0.60%, Mn 11.00 ~ 14.00%, Cr 16.50 ~ 19.00%, Ni 0.50 ~ 2.50%, N 0.20 ~ 0.45%, all the other are Fe;
(2) rod iron is forging in ejection course of hot rolling, forging ratio >=3, hot rolling ratio of elongation >=5;
(3) rod iron is placed on shaft furnace burner hearth and hits exactly and carry out solution heat treatment in heat treatment process;
(4) machined of rod iron comprises centreless grinding, polishing and the screw thread operation of rolling.
2. the manufacture method of a kind of magnetism-free stainless steel core through screw rod as claimed in claim 1, is characterized in that each weight percentages of components that described alloying element and described steel scrap are optimized after combination is: C 0.12 ~ 0.14%, Si 0.40 ~ 0.60%, Mn 12.50 ~ 13.60%, Cr 16.50 ~ 18.20%, Ni 2.00 ~ 2.45%, N 0.25 ~ 0.44%, all the other are Fe.
3. the manufacture method of a kind of magnetism-free stainless steel core through screw rod as claimed in claim 1, is characterized in that the described shaft furnace degree of depth is not less than 1.5 times of described magnetism-free stainless steel core through screw rod length.
4. the manufacture method of a kind of magnetism-free stainless steel core through screw rod as claimed in claim 1, dye penetrant inspection is carried out on the magnetism-free stainless steel core through screw rod surface described in it is characterized in that, thoroughly to remove described screw surface micro-crack.
5. the manufacture method of a kind of magnetism-free stainless steel core through screw rod as claimed in claim 1, is characterized in that, after described magnetism-free stainless steel core through screw rod machined, carrying out oscillating aging processing, to remove residual stress.
6. the manufacture method of a kind of magnetism-free stainless steel core through screw rod as claimed in claim 1, is characterized in that described magnetism-free stainless steel core through screw rod two ends screw thread wire rolling mill rolling, and does not cut off the fiber of described magnetism-free stainless steel core through screw rod.
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| CN201110458608.5A CN102554570B (en) | 2011-12-31 | 2011-12-31 | Manufacturing method for non-magnetic stainless steel adapter lug |
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| CN201110458608.5A CN102554570B (en) | 2011-12-31 | 2011-12-31 | Manufacturing method for non-magnetic stainless steel adapter lug |
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| CN102554570B true CN102554570B (en) | 2014-04-16 |
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| CN103042359A (en) * | 2012-09-11 | 2013-04-17 | 昌利锻造有限公司 | Method for forging screw for extruding machine |
| CN108406315A (en) * | 2018-04-27 | 2018-08-17 | 上海众源燃油分配器制造有限公司 | A kind of gasoline high pressure oil rail forging system and technique |
Citations (3)
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|---|---|---|---|---|
| CN1580587A (en) * | 2004-05-20 | 2005-02-16 | 陈菊生 | Method for making magnet-free stainless steel through screw stem |
| CN101113749A (en) * | 2007-09-03 | 2008-01-30 | 陈菊生 | Method for making high intensity non-magnetic non-corrodible steel tauten screw rod |
| CN101815803A (en) * | 2007-10-10 | 2010-08-25 | 新日铁住金不锈钢株式会社 | Duplex stainless steel wire material, steel wire, bolt, and method for production of the bolt |
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| JP2006274392A (en) * | 2005-03-30 | 2006-10-12 | Honda Motor Co Ltd | BOLT MADE OF TITANIUM ALLOY AND METHOD FOR PRODUCING BOLT MADE OF TITANIUM ALLOY HAVING TENSILE STRENGTH OF AT LEAST 800 MPa |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1580587A (en) * | 2004-05-20 | 2005-02-16 | 陈菊生 | Method for making magnet-free stainless steel through screw stem |
| CN101113749A (en) * | 2007-09-03 | 2008-01-30 | 陈菊生 | Method for making high intensity non-magnetic non-corrodible steel tauten screw rod |
| CN101815803A (en) * | 2007-10-10 | 2010-08-25 | 新日铁住金不锈钢株式会社 | Duplex stainless steel wire material, steel wire, bolt, and method for production of the bolt |
Non-Patent Citations (4)
| Title |
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| 刘浏.炉外精炼工艺技术的发展.《炼钢》.2001,第17卷(第4期),1-7. |
| 小型氩氧混合脱碳(AOD)炉炼钢工艺;李瑞丽等;《江苏冶金》;20071231;第35卷(第6期);46-48 * |
| 李瑞丽等.小型氩氧混合脱碳(AOD)炉炼钢工艺.《江苏冶金》.2007,第35卷(第6期),46-48. |
| 炉外精炼工艺技术的发展;刘浏;《炼钢》;20010831;第17卷(第4期);1-7 * |
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Effective date of registration: 20160412 Address after: 215104, 1, Suzhou Road, 7 North Guandu Road, Wuzhong District, Jiangsu Patentee after: Suzhou Machining Precision Electronics Co., Ltd. Address before: 200072 Shanghai, Zhabei District, Shanghai Road, room 502-508, No. 1059 Patentee before: Shanghai Jianing New Technology Research Institute |
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Address after: 215104 1 Guandu Road 7, Yuexi street, Wuzhong District, Suzhou, Jiangsu. Patentee after: Jiangsu Mai Lin aviation Polytron Technologies Inc Address before: 215104 1 Guandu Road 7, Yuexi street, Wuzhong District, Suzhou, Jiangsu. Patentee before: Suzhou Machining Precision Electronics Co., Ltd. |
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