CN1570182A - Microalloy cast steel and its manufacturing technique - Google Patents
Microalloy cast steel and its manufacturing technique Download PDFInfo
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- CN1570182A CN1570182A CN 200410013071 CN200410013071A CN1570182A CN 1570182 A CN1570182 A CN 1570182A CN 200410013071 CN200410013071 CN 200410013071 CN 200410013071 A CN200410013071 A CN 200410013071A CN 1570182 A CN1570182 A CN 1570182A
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Abstract
The invention provides a micro-alloy cast steel with the mechanical property of seasoning mechanical structure steel. The cast steel comprises basic element iron and alloy elements C, Ti, V, Mn, Cr, and Si, wherein the content of C is 0.1% to 0.5%, the content of Ti is 0.05% to 0.2%, the content of V is 0.05% to 0.2%, the content of Mn is 1% to 2.5%, the content of Cr is 0.5% to 1.5%, and the content of Si is 0.5% to 2.0%. The preparing process comprises: smelting: adding C, Ti, V, Mn, and Cr according to the content; casting: controlling the solidification speed and the cooling speed after solidification; controlling normalizing: keeping the temperature of 900 C. to 950 C. and controlling the cooling speed of 1 C/s to 3 C/s; shot blasting.
Description
Technical field
The present invention relates to microalloy cast steel and production technique thereof.
Background technology
In the cast steel field, by adding rare elements such as Cr, Ni, Mo, make the alloying element total content reach Medium Alloy Steel (5-10%) level at present, cast steel as cast condition grain fineness number 1-5 level adopts quenching, tempering heat treatment process to reach requirement hardness and mechanical property thereof.Above-mentioned, because the rare constituent content that uses is big, the cost height of cast steel.In actually operating, complex technical process, the hardening break phenomenon is difficult to avoid.
Summary of the invention
Use in order to solve existing Alloy Cast Steel that rare constituent content is big, problem easy to crack in the cost height of cast steel, quenching process, the present invention proposes microalloy cast steel and production technique thereof.
Technical scheme: the best solid solution strengthened alloy element of iron and steel metal is a carbon, and adopting the alternative carbon of rare alloying element to reach the alloy solid solution enhancement purpose is a kind of waste.Alloying elements is under the low-down situation of concentration (below 0.1%), and the influence to the performance of steel produces highly significant claims that these alloying elements are microalloy element.Principle of the present invention is to adopt microalloy element under low levels very, and with the interaction of C, N, S, Mn, Cr, by the precipitation strength of alloy carbon, nitride, crystal grain thinning improves stabilization of austenite, and metal strength is significantly improved.By the control normalizing process, obtain bainite, martensitic stucture, thereby make cast steel have the mechanical property of modified engineering steel.
The microalloy cast steel that the present invention proposes, contain fundamental element iron and alloying element C, Ti, V, Mn, Cr, Si, it is characterized in that: C is that 0.1-0.5%, Ti are that 0.05-0.2%, V are that 0.05-0.2%, Mn are that 1-2.5%, Cr are that 0.5-1.5%, Si are 0.5-2.0%.
The production technique of described microalloy cast steel is: melting: add C, Ti, V, Mn, Cr, control the content of each element; Casting: the control setting rate and solidify after cooling rate, promptly from time of 1600 ℃-1200 ℃ be 8-10 minute, make alloy carbonitride, sulfide separate out refine austenite crystal grain; Cleaning; The control normalizing: normalizing temperature is 900-950 ℃, conventional insulation, and controlled chilling speed is 1-3 ℃/second; Shot-peening.
Beneficial effect: in fusion process, alloy carboritride, sulfide are separated out becomes the crystallization nucleus, and grain fineness number reaches more than 8 grades.Liquid state is converted to solid-state, and austenitic transformation is to the ambient-temp-stable phase, and two stage alloy carboritrides are separated out, and make steel strength reach σ
bMore than the 800MPa.The air controlled chilling reaches bainite, martensite metallographic structure, thereby has the equally good comprehensive mechanical performance of modified engineering steel.
Work in-process, by control in the casting cycle setting rate and solidify after cooling rate, form the austenite crystal of refinement; Cancellation cast steel quenches, the tempering heat treatment operation, only with the control normalizing process, obtains that bainite, martensite, trickle pearlitic structure have been avoided hardening break, distortion and the loss due to spoiled work that produces; Saved energy consumption; Reduced goods in process inventory; Factory building, facility investment have been saved; Saved the labour expenses; Shortened technical process; Eliminated the pollution of quenching technology, improved environment air, water.
From calculating economically, the quenching of foundry goods per ton, tempering expense are 3000 yuan.This patent can make steel casting reduce cost 3000 yuan/ton.
The alloying element of low alloy steel generally all adds for the hardening capacity that improves material.Because cancelled quenching process, so noble elements such as original Cr, the Ni that adds, Mo can be cancelled or reduce in right amount.
Because the close grain of steel casting does not have quenching crack, the reliability of part is improved, have remarkable social benefit.
Description of drawings
Fig. 1 is the technological process of production figure of present Alloy Cast Steel.
Fig. 2 is the technological process of production figure of microalloy cast steel of the present invention.
Embodiment
Be the Production Flow Chart of present Alloy Cast Steel as shown in Figure 1, mainly successively through dissolving, casting, cleaning, normalizing, quenching, tempering, blasting process.In above-mentioned technology, Alloy Cast Steel must pass through quenching, tempering, blasting process, and in quenching process, workpiece distortion easy to crack influences the quality of workpiece.
Shown in Figure 2 is the Production Flow Chart of microalloy cast steel of the present invention, mainly successively through dissolving, cast, clear up, control normalizing, blasting process.Be specially: in fusion process, add alloying element, guarantee that C is that 0.1-0.5%, Ti are that 0.05-0.2%, V are that 0.05-0.2%, Mn are that 1-2.5%, Cr are 0.5-1.5% in the dissolving liquid; In casting cycle, the control setting rate and solidify after cooling rate, promptly from time of 1600 ℃-1200 ℃ be 8-10 minute, make alloy carbonitride, sulfide separate out refine austenite crystal grain; In control normalizing process, normalizing temperature is 900-950 ℃, conventional insulation, by air-cooled stove controlled chilling speed, speed of cooling is 1-3 ℃/second, guarantees the solid solution of acquisition fine grained austenite and alloy carbon, nitrogen compound, obtains bainite, martensite normal temperature tissue; In shotblasting machine workpiece being carried out shot blasting on surface handles.The microalloy cast steel that obtains by above-mentioned production has the mechanical property of modified engineering steel, in production technique, compare with present technology, quenching and tempering process have been omitted, avoided the craze and transfiguration of workpiece, shortened the technological process of production again, under the situation that guarantees mechanical property, reduced production cost, can adopt the microalloy cast steel blank to original ask for something high-mechanical property and quenchless workpiece, the new processing means of developing workpiece.
Claims (2)
1, microalloy cast steel contains fundamental element iron and alloying element C, Ti, V, Mn, Cr, Si, it is characterized in that: C is that 0.1-0.5%, Ti are that 0.05-0.2%, V are that 0.05-0.2%, Mn are that 1-2.5%, Cr are that 0.5-1.5%, Si are 0.5-2.0%.
2, the production technique of the described microalloy cast steel of claim 1 is: melting: add C, Ti, V, Mn, Cr, control the content of each element; Casting: the control setting rate and solidify after cooling rate, promptly from time of 1600 ℃-1200 ℃ be 8-10 minute, make alloy carbonitride, sulfide separate out refine austenite crystal grain; Cleaning; The control normalizing: normalizing temperature is 900-950 ℃ of conventional insulation, and controlled chilling speed is 1-3 ℃/second; Shot-peening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100130711A CN1330788C (en) | 2004-04-20 | 2004-04-20 | Microalloy cast steel and its manufacturing technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100130711A CN1330788C (en) | 2004-04-20 | 2004-04-20 | Microalloy cast steel and its manufacturing technique |
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| Publication Number | Publication Date |
|---|---|
| CN1570182A true CN1570182A (en) | 2005-01-26 |
| CN1330788C CN1330788C (en) | 2007-08-08 |
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| CNB2004100130711A Expired - Fee Related CN1330788C (en) | 2004-04-20 | 2004-04-20 | Microalloy cast steel and its manufacturing technique |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101886223A (en) * | 2010-07-09 | 2010-11-17 | 清华大学 | Method for preparing high-strength high-toughness low alloy manganese series cast steel |
| CN101008069B (en) * | 2005-12-28 | 2011-06-01 | 本田技研工业株式会社 | Nitrocarburized microalloyed steel member |
| CN102899575A (en) * | 2012-11-12 | 2013-01-30 | 莱芜钢铁集团有限公司 | Non-quenched and tempered steel used for welding and electroplating hydraulic rod and production method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85107749A (en) * | 1985-10-19 | 1986-07-23 | 鞍山钢铁公司 | Wear-resistant and corrosion-resistant low-alloy steel for light rails |
| CN1034678C (en) * | 1995-03-28 | 1997-04-23 | 王宇辉 | Low-alloy wear-resisting steel |
| CN1182142A (en) * | 1996-11-07 | 1998-05-20 | 鞍山钢铁集团公司 | Abrasion-resisting cast steel |
| JP4219023B2 (en) * | 1998-11-19 | 2009-02-04 | 新日本製鐵株式会社 | High-strength drive shaft and manufacturing method thereof |
| CN1188538C (en) * | 2000-12-21 | 2005-02-09 | 高福池 | Self-lubricating antiwear composite material |
-
2004
- 2004-04-20 CN CNB2004100130711A patent/CN1330788C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101008069B (en) * | 2005-12-28 | 2011-06-01 | 本田技研工业株式会社 | Nitrocarburized microalloyed steel member |
| CN101886223A (en) * | 2010-07-09 | 2010-11-17 | 清华大学 | Method for preparing high-strength high-toughness low alloy manganese series cast steel |
| CN101886223B (en) * | 2010-07-09 | 2012-05-23 | 清华大学 | Method for preparing high-strength high-toughness low alloy manganese series cast steel |
| CN102899575A (en) * | 2012-11-12 | 2013-01-30 | 莱芜钢铁集团有限公司 | Non-quenched and tempered steel used for welding and electroplating hydraulic rod and production method thereof |
| CN102899575B (en) * | 2012-11-12 | 2014-08-27 | 莱芜钢铁集团有限公司 | Non-quenched and tempered steel used for welding and electroplating hydraulic rod and production method thereof |
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| Publication number | Publication date |
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| CN1330788C (en) | 2007-08-08 |
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Owner name: NINGBO WANGUAN INVESTMENT CASTING CO., LTD. Free format text: FORMER OWNER: CHEN SHOUJIE Effective date: 20081024 |
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Assignee: Ningbo Wanguan Investment Casting Co.,Ltd. Assignor: Chen Shoujie Contract fulfillment period: 2008.6.20 to 2013.6.19 contract change Contract record no.: 2008330000491 Denomination of invention: Microalloy cast steel and its manufacturing technique Granted publication date: 20070808 License type: Exclusive license Record date: 2008.9.17 |
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Free format text: EXCLUSIVE LICENCE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.6.20 TO 2013.6.19 Name of requester: NINGBO WANGUAN INVESTMENT CASTING CO., LTD. Effective date: 20080917 |
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Effective date of registration: 20081024 Address after: Lotus Bridge, Yunlong Town, Ningbo, Zhejiang, Yinzhou District Patentee after: Ningbo Wanguan Investment Casting Co.,Ltd. Address before: Hubei City Park in Shiyan Province Dongfeng Road Office District 203 building 604 room dormitory Wenhui Patentee before: Chen Shoujie |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070808 Termination date: 20130420 |