CN1410583A - Calcium sulfur magnesium series easy cutting steel - Google Patents
Calcium sulfur magnesium series easy cutting steel Download PDFInfo
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- CN1410583A CN1410583A CN 02153023 CN02153023A CN1410583A CN 1410583 A CN1410583 A CN 1410583A CN 02153023 CN02153023 CN 02153023 CN 02153023 A CN02153023 A CN 02153023A CN 1410583 A CN1410583 A CN 1410583A
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- steel
- free
- deoxidation
- cutting steel
- y45casmg
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Abstract
The invention relates to the fast machine steel containing elements of calcium, sulfur and magnesium belonging to the area of metal material. The invented material can be utilized to manufacture important parts such as crankshafts and connecting rods applied in automobiles. Measures are taken such as the neutral covering dregs, diffusion deoxidation, deoxidation by use of feeding wire, deteroprating the encrusting matter by use of the elements of calcium, sulfur and magnesium etc. to produce the steel with both of good mechanical and fast machine properties. The mechanical properties of steels Y45CaSMg, Y45CaSMg are as following: the tensile strength as 800 MPa for sample in hot rolling state, the extensibility as 17.7% and the contraction of area as 47%.
Description
Technical field:
The invention belongs to metal material field, particularly a kind of free-cutting steel of calcic sulphur magnesium elements can be used for making automobile and mechanical strength members such as bent axle, union lever.
Background technology:
Most resulfurizing series free cutting steels have reduced plasticity and toughness, especially the transverse mechanical poor-performing of material.Lead series free cutting steel has not only improved free cutting property but also kept mechanical property preferably, however since when smelting the lead and easy-cutting steel volatilization contaminate environment of lead, harm people's health, its application has a declining tendency.The calcium and easy-cutting steel that grows up from the sixties has been subjected to general attention.Control deoxidation with calcium alloy when smelting the calcium and easy-cutting steel, make and form CaO-SiO in the steel
2-Al
2O
3The ternary inclusion has improved the free cutting property of steel when high speed cutting widely, and its mechanical property is identical with basic steel.Yet merely the steel grade of handling with calcium only just has free cutting property when using the inserted tool high speed cutting, and the austenite crystal of the calcium and easy-cutting steel tendency of growing up is bigger.
Summary of the invention:
The technical problem to be solved in the present invention is: alleviate the influence of sulphur to steel mechanics performance under the prerequisite of the free cutting property that keeps Sulfur Bearing Steel.
A kind of calcium sulfur magnesium series free-cutting steel, be called the Y45CaSMg free-cutting steel, it is characterized in that major ingredient (Wt%) is: C:0.42～0.50, Si:0.20～0.50, Mn:1.00～1.20, P:0.01～0.04, S:0.01～0.07, Ca:0.002～0.016, Mg0.0001-0.002.
The optimal components of calcium sulfur magnesium series free-cutting steel is: major ingredient (Wt%): C:0.42～0.50, Si:0.20～0.50, Mn:1.00～1.20, P:0.02～0.03, S:0.03～0.05, Ca:0.004～0.010, Mg:0.001-0.002.
The present invention controls deoxidation with silicocalcium to molten steel, and has added elements such as an amount of magnesium, sulphur, has controlled the form of nonmetallic inclusionsin steel effectively, refinement inclusion and crystal grain, make steel obtain excellent mechanical property and good free cutting property.Adopted the special magnesium technology that adds in the smelting: utilize magnesium oxide as the magnesium source, add aluminium, and add a certain amount of calcium oxide and Calcium Fluoride (Fluorspan) mixes, make to increase magnesia mixture, make cored-wire then, insert in the molten steel simultaneously with the silico-calcium cored-wire as reductive agent.This method that adds magnesium, the phenomenon of reacting balance, no molten steel splash takes place, and cost is lower.
The thin covering slag of employed neutrality in the smelting, its composition is CaO20-35%, SiO
225-40%, Al
2O
330-40%.
The method of deoxidation of this steel grade and step: at first with ferromanganese, ferrosilicon deoxidation or add the aluminium ash that contains aluminium 20-40% and carry out diffusive deoxidation, next adopts hello silk normal direction molten steel inside insertion Ca-Si cored-wire and Mg alloy cored wine to control deoxidation, feeds an amount and decides according to steel grade and recovery rate.
Adopt the oxygen activity in the quick Determining oxygen probe mensuration of the zirconia solid electrolyte oxygen concentration cell molten steel.Hello
Molten steel oxygen activity before the silk should be controlled at 40～200 * 10
-6
Smelt and adopt top blast or bottom argon blowing technology and induction stirring technology.
Smelt the type of furnace: electric arc furnace, induction furnace and converter
The mechanical property of Y45CaSMg free-cutting steel is, the tensile strength of hot rolling (forging) attitude sample reaches 800MPa, and unit elongation is 17.7%, and section shrinks 47%, the standard that has surpassed corresponding steel grade (Y45Ca) among the GB GB8731-88 also increases than the mechanical property of its basic steel 45 steel.
Embodiment:
A kind of calcium sulfur magnesium series free-cutting steel adopts electric arc furnace smelting, and BOTTOM ARGON BLOWING adds electromagnetism and stirs, and major ingredient (Wt%) is: C:0.45, Si:0.30, Mn:1.1, P:0.02, S:0.04, Ca:0.006, Mg:0.002.Use neutral thin covering slag, its composition is CaO20-35%, SiO
225-40%, Al
2O
330-40%.
Method of deoxidation and step: at first use the ferromanganese deoxidation, next adopts hello silk normal direction molten steel inner insertion Ca-Si cored-wire and Mg alloy cored wine to control deoxidation, adopt the oxygen activity in the quick Determining oxygen probe mensuration of the zirconia solid electrolyte oxygen concentration cell molten steel, feed the preceding molten steel oxygen activity of silk and should be controlled at 80 * 10
-6Employed Mg alloy cored wine is to utilize magnesium oxide as the magnesium source in the smelting, adds aluminium as reductive agent, and adds a certain amount of calcium oxide and Calcium Fluoride (Fluorspan) mixes, make to increase magnesia mixture, makes cored-wire then.
The new steel grade cutting ability is good, on the BJ-1630GD lathe, when using 41605H type YT15 Wimet machine swaging clamp tool that sample is carried out the turning experiment, setting the lathe spindle rotating speed is that 950 commentaries on classics/min, average cutting speed are that 85m/min, feeding speed 0.096mm/ change, the depth of cut is 1.0mm..Through 30 minutes cutting test, cutter wear of the tool flank width Vb illustrated that much smaller than 0.3mm the life-span of cutter is very long.
Claims (4)
1. calcium sulfur magnesium series free-cutting steel, be called the Y45CaSMg free-cutting steel, it is characterized in that major ingredient (Wt%) is: C:0.42～0.50, Si:0.20～0.50, Mn:1.00～1.20, P:0.01～0.04, S:0.01～0.07, Ca:0.002～0.016, Mg:0.0001-0.002; Smelt and adopt top blast or bottom argon blowing technology, and induction stirring technology, the type of furnace smelted: electric arc furnace, induction furnace and converter.
2, Y45CaSMg free-cutting steel as claimed in claim 1 is characterized in that the optimal components of free-cutting steel is: C:0.42～0.50, Si:0.20～0.50, Mn:1.00～1.20, P:0.02～0.03, S:0.03～0.05, Ca:0.004～0.010, Mg:0.001-0.002;
3. Y45CaSMg free-cutting steel as claimed in claim 1 or 2, the thin covering slag of employed neutrality in it is characterized in that smelting, its composition is CaO20-35%, SiO
225-40%, Al
2O
330-40%; The method of deoxidation of this steel grade and step: at first with ferromanganese, ferrosilicon deoxidation or add the aluminium ash that contains aluminium 20-40% and carry out diffusive deoxidation, next adopts hello silk normal direction molten steel inner insertion Ca-Si cored-wire and Mg alloy cored wine to control deoxidation, adopt the oxygen activity in the quick Determining oxygen probe mensuration of the zirconia solid electrolyte oxygen concentration cell molten steel, it is fixed according to steel grade and recovery rate to feed the silk amount, and the molten steel oxygen activity before hello the silk should be controlled at 40～200 * 10
-6
4. Y45CaSMg free-cutting steel as claimed in claim 3, employed Mg alloy cored wine is to utilize magnesium oxide as the magnesium source in it is characterized in that smelting, and adds aluminium as reductive agent, and adds a certain amount of calcium oxide and Calcium Fluoride (Fluorspan) mixes, make and increase magnesia mixture, make cored-wire then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021530238A CN1188536C (en) | 2002-11-29 | 2002-11-29 | Calcium sulfur magnesium series easy cutting steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021530238A CN1188536C (en) | 2002-11-29 | 2002-11-29 | Calcium sulfur magnesium series easy cutting steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1410583A true CN1410583A (en) | 2003-04-16 |
| CN1188536C CN1188536C (en) | 2005-02-09 |
Family
ID=4752191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021530238A Expired - Fee Related CN1188536C (en) | 2002-11-29 | 2002-11-29 | Calcium sulfur magnesium series easy cutting steel |
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| CN (1) | CN1188536C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105779907A (en) * | 2016-03-19 | 2016-07-20 | 上海大学 | Free-cutting steel containing magnesium and calcium and production process |
| CN109988883A (en) * | 2019-04-09 | 2019-07-09 | 上海大学 | The magnesium calcium adding technology method of the non-hardened and tempered steel of calcium containing magnesium |
| CN110117694A (en) * | 2019-04-09 | 2019-08-13 | 上海大学 | The magnesium adding technology method of the automatic steel containing magnesium |
-
2002
- 2002-11-29 CN CNB021530238A patent/CN1188536C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105779907A (en) * | 2016-03-19 | 2016-07-20 | 上海大学 | Free-cutting steel containing magnesium and calcium and production process |
| CN109988883A (en) * | 2019-04-09 | 2019-07-09 | 上海大学 | The magnesium calcium adding technology method of the non-hardened and tempered steel of calcium containing magnesium |
| CN110117694A (en) * | 2019-04-09 | 2019-08-13 | 上海大学 | The magnesium adding technology method of the automatic steel containing magnesium |
| CN110117694B (en) * | 2019-04-09 | 2021-06-04 | 上海大学 | Magnesium adding process for magnesium-containing free-cutting steel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1188536C (en) | 2005-02-09 |
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Owner name: LAIWU IRON & STEEL GROUP CO., LTD. BEIJING UNIV. Free format text: FORMER OWNER: BEIJING UNIV. OF SCIENCE AND TECHNOLOGY Effective date: 20040625 |
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Effective date of registration: 20040625 Address after: 100083 No. 30, Haidian District, Beijing, Xueyuan Road Applicant after: Laiwu Steel Group Ltd, University of Science and Technology Beijing Address before: 100083 No. 30, Haidian District, Beijing, Xueyuan Road Applicant before: University of Science and Technology Beijing |
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Owner name: BEIJING UNIV. OF SCIENCE AND TECHNOLOGY Effective date: 20040709 Owner name: LAIWU IRON & STEEL GROUP CO., LTD. Free format text: FORMER OWNER: BEIJING UNIV. OF SCIENCE AND TECHNOLOGY |
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Effective date of registration: 20040709 Address after: 271104 Shandong Laiwu Steel Group Ltd technology center, Gangcheng District, Shandong, Laiwu Applicant after: Laiwu Iron & Steel Group Corp., Ltd. Co-applicant after: University of Science and Technology Beijing Address before: 100083 No. 30, Haidian District, Beijing, Xueyuan Road Applicant before: University of Science and Technology Beijing |
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