CN1456700A - Calcium-sulphur-tin series composite easily machined steel - Google Patents
Calcium-sulphur-tin series composite easily machined steel Download PDFInfo
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- CN1456700A CN1456700A CN 03136921 CN03136921A CN1456700A CN 1456700 A CN1456700 A CN 1456700A CN 03136921 CN03136921 CN 03136921 CN 03136921 A CN03136921 A CN 03136921A CN 1456700 A CN1456700 A CN 1456700A
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- steel
- free
- y45cassn
- deoxidation
- cutting
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Abstract
An easily machined steel Y45CaSSn containing Ca, S and Sn for making crankshaft, container and hydraulic system is disclosed. Its preparing technology features use of thin covered neutral slag, diffusion deoxidizing, controlling deoxidizing by feeding wire, and fast quantitative analysis of oxygen. It has over 800 MPa for tension strength, 16% for elongation percentage, and 30% for reduction of cross section.
Description
Technical field:
The invention belongs to metal material field, particularly a kind of free-cutting steel of calcic sulphur tin element can be used for making automobile and mechanical strength members such as bent axle, container and hydraulic efficiency system.
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.
The compound free-cutting steel of a kind of calcium-sulphur-tin series, be called the Y45CaSSn free-cutting steel, it is characterized in that major ingredient (Wt%) is: C:0.35～0.52, Si:0.10～0.50, Mn:0.50～1.20, P :≤0.04, S:0.02～0.15, Ca:0.002～0.010, Sn:0.06～0.20.
The optimal components of Y45CaSSn free-cutting steel is: C:0.42～0.50, Si:0.20～0.50, Mn:0.80～1.00, P:0.02～0.03, S:0.03～0.05, Ca:0.004～0.010, Sn:0.08-0.12.
The present invention controls deoxidation with silicocalcium to molten steel, and elements such as an amount of calcium, sulphur, tin have been added, 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 thin covering slag of employed neutrality in the smelting 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 or Ca-Mg cored-wire 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 solid electrolyte oxygen concentration cell molten steel.Feed the preceding molten steel oxygen activity of silk and should be controlled at 50～150 * 10
-6
Smelt and adopt top blast or bottom argon blowing technology and induction stirring technology.What use in the smelting is stanniferous steel scrap or tin concentrate.
Smelt the type of furnace: electric arc furnace, induction furnace and converter
The mechanical property of Y45CaSSn free-cutting steel is, the tensile strength of hot rolling (forging) attitude sample reaches 800MPa, and unit elongation is 16%, and section shrinks 30%, the standard that has surpassed corresponding steel grade (Y45Ca) among the GB GB8731-88, its mechanical property meet or exceed basic steel 45 steel standards.
Embodiment:
The compound free-cutting steel of a kind of calcium-sulphur-tin series, adopt electric arc furnace smelting, BOTTOM ARGON BLOWING adds electromagnetism and stirs, major ingredient (Wt%) is: C:0.42～0.50, Si:0.10～0.50, Mn:0.8～1.00, P :≤0.04, neutral thin covering slag is used in S:0.02～0.15, Ca:0.002～0.010, Sn:0.06～0.20, and its composition is CaO30%, SiO
235%, Al
2O
335%.
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 or Ca-Mg cored-wire 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
-6
Novel C a-S-Sn compound free-cutting steel kind mechanical property and free cutting property are held concurrently excellent.Test result on the MTS810 material-testing machine shows the mechanical property excellence of steel, the tensile strength of sample reaches 800MPa, unit elongation is 16%, section contraction 30% has surpassed the standard of corresponding steel grade (Y45Ca) among the GB GB8731-88, and its mechanical property meets or exceeds basic steel 45 steel standards.This steel grade can be used for making the automobile and the mechanical strength members such as part of bent axle, container and hydraulic efficiency system.
This steel grade cutting ability is good.The surfaceness of sample has all reached 6.4 grades.
Inclusion in the steel is a complex inclusion, and complex inclusion is mainly by MnS, SiO
2,, CaO and Al
2O
3Deng composition, its granularity is spherical or block less than 10 μ m more, and tin content is than matrix height near inclusion.The crystal grain of matrix is tiny and even.
Claims (4)
1. compound free-cutting steel of calcium-sulphur-tin series, be called the Y45CaSSn free-cutting steel, it is characterized in that major ingredient (Wt%) is: C:0.35～0.52, Si:0.10～0.50, Mn:0.40～1.20, P :≤0.04, S:0.02～0.15, Ca:0.002～0.010, Sn:0.06～0.20; 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.
2, Y45CaSSn 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:0.8～1.00, P:0.02～0.03, S:0.03～0.05, Ca:0.004～0.010, Sn:0.06-0.09.
3. Y45CaSSn 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% also contains a small amount of MgO, TiO simultaneously
2The 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 or Ca-Mg cored-wire to control deoxidation, adopt the oxygen activity in the quick Determining oxygen probe mensuration of the 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 50～150 * 10
-6
4. Y45CaSSn free-cutting steel as claimed in claim 3, what use in it is characterized in that smelting is stanniferous steel scrap or tin concentrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03136921 CN1234898C (en) | 2003-06-02 | 2003-06-02 | Calcium-sulphur-tin series composite easily machined steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03136921 CN1234898C (en) | 2003-06-02 | 2003-06-02 | Calcium-sulphur-tin series composite easily machined steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1456700A true CN1456700A (en) | 2003-11-19 |
| CN1234898C CN1234898C (en) | 2006-01-04 |
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ID=29411804
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03136921 Expired - Fee Related CN1234898C (en) | 2003-06-02 | 2003-06-02 | Calcium-sulphur-tin series composite easily machined steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101368225B (en) * | 2008-09-28 | 2010-10-13 | 舞阳钢铁有限责任公司 | Smelting method for vulcanization easy cutting plastic mold steel |
| CN105779907A (en) * | 2016-03-19 | 2016-07-20 | 上海大学 | Free-cutting steel containing magnesium and calcium and production process |
-
2003
- 2003-06-02 CN CN 03136921 patent/CN1234898C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101368225B (en) * | 2008-09-28 | 2010-10-13 | 舞阳钢铁有限责任公司 | Smelting method for vulcanization easy cutting plastic mold steel |
| CN105779907A (en) * | 2016-03-19 | 2016-07-20 | 上海大学 | Free-cutting steel containing magnesium and calcium and production process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1234898C (en) | 2006-01-04 |
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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, Laiwu iron and steel area, Shandong, China 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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