CN1450192A - Tin containing free-cutting steel - Google Patents
Tin containing free-cutting steel Download PDFInfo
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- CN1450192A CN1450192A CN 03119632 CN03119632A CN1450192A CN 1450192 A CN1450192 A CN 1450192A CN 03119632 CN03119632 CN 03119632 CN 03119632 A CN03119632 A CN 03119632A CN 1450192 A CN1450192 A CN 1450192A
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- steel
- containing free
- tin
- free cutting
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Abstract
The present invention relates to a tin-contained free machining steel. Said steel can be used for making important standard parts of high-strength Bolts, etc. of automobile and machinery, and is characterized by that in said steel 0.03-0.05% of Sn is contained. Said invention adopts the several measures of neutral covering slag molten steel, diffusing deoxygenation and solid electrolyte oxygen concentration difference cell to quickly define oxygen to develop out the leadless free machining steel (Y20Sn) with excellent mechanical propery and free-cutting machinability. The tests show that the tensile strength of its sample is up to 460MPa, percentage elongation is 25%-30% and reduction of cross-sectional area is 55%-60%.
Description
Technical field:
The invention belongs to ferrous metallurgy and material engineering field, particularly a kind of lead-free free-cutting steel grade (Y20Sn) can be used for making automobile and mechanical major criterion parts such as high strength bolt.
Background technology:
Most resulfurizing series free cutting steels have reduced plasticity and toughness, especially the transverse mechanical poor-performing of material.The lead and easy-cutting steel has favorable mechanical performance and heat treatment performance, in excellent free cutting property is arranged under the low cutting speed.Yet because Lead contamination environment in the steelmaking process, the production of lead and easy-cutting steel is restricted.
Summary of the invention:
The object of the invention be to produce a kind of can lead-free free-cutting steel, to solve Lead contamination problem of environment in the steelmaking process.
Tin belongs to gang together with plumbous in the periodic table of chemical element, physics and chemical property are very close, is plumbous good replacer as easy cutting element tin.
A kind of tin-containing free cutting steel is characterized in that the major ingredient (Wt%) of this steel grade is:
C：0.18～0.22、Si：0.40～0.60、Mn：0.65～1.00、P：0.05～0.08、S：0.15～0.28、
Sn：0.01～0.05。
The key measure of smelting is as follows:
(1) for preventing molten steel oxygen uptake in the steelmaking process, adopts the thin slag of neutral, as CaO-SiO
2-Al
2O
3The ternary slag covers molten steel.
(2) adopt suitable method of deoxidation and step: mainly carry out diffusive deoxidation with ferromanganese or the aluminium ash or the carbon dust that add a small amount of ferrosilicon or contain aluminium about 20%.
(3), and adjust at any time with the oxygen activity in the quick Determining oxygen probe mensuration of the zirconia solid electrolyte oxygen concentration cell molten steel.In the 20Kg induction furnace, feed the preceding molten steel oxygen activity of silk and should be controlled at 70～100 * 10
-6Big stove is because oxygen uptake is slow, and oxygen activity can be suitably higher.
(4) add an amount of tin in the steel, the tin content of molten steel is no more than 0.05%.
(5) carbon sulphur is two important elements, and in time sampling analysis is adjusted composition.
(6) adopt Argon or induction stirring, make uniform ingredients.
(7) leave standstill appropriate time, take off removing dross, pour into a mould.
The mechanical property excellence of Y20Sn free-cutting steel, the tensile strength of hot rolling (forging) attitude sample reaches 460MPa, and unit elongation is 25～30%, and relative reduction in area 55～60% has surpassed the standard (seeing attached list 1) of corresponding steel grade-Y20, Y15Pb among the GB GB8731-88.
Embodiment:
The major ingredient of steel grade (Wt%) is:
C：0.20、Si：0.45、Mn：0.85、P：0.05、S：0.20、Sn：0.05。
Adopt the thin slag CaO-SiO of neutral
2-Al
2O
3The ternary slag covers molten steel.
Carry out diffusive deoxidation with ferromanganese and the aluminium ash or the carbon dust that contain aluminium about 20%.
With the oxygen activity in the quick Determining oxygen probe mensuration of the zirconia solid electrolyte oxygen concentration cell molten steel, and adjust at any time.In the 500Kg induction furnace, smelt, feed the preceding molten steel oxygen activity of silk and be controlled at 70～100 * 10
-6
The tin content 0.05% of molten steel.
Adopt induction stirring, make uniform ingredients.
Left standstill 5 minutes, and took off removing dross, pour into a mould.
The steel grade cutting ability is good, on the BJ-1630GD lathe, when using speedy steel cutting-tool that sample is carried out the turning experiment, setting lathe spindle rotating speed is followed successively by 200,320 and 550 commentaries on classics/min, average cutting speed is 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 0.50mm the life-span of cutter is very long.Promptly the property handled is good for chip breaking for the car bits.The surfaceness of sample has all reached 6.4 grades.
Inclusion in the steel is MnS, and complex inclusion is mainly by MnS, SiO
2And Al
2O
3Deng composition, its granularity is spherical or block less than 10 μ m more.The crystal grain of matrix is tiny and even.Relatively mechanical property, free cutting property and the metallographic structure of the free-cutting steel of different tin content, 0.05% is best tin content.
The national standard of subordinate list 1. free-cutting steel mechanical propertys (hot rolling attitude GB8731-88)
| The trade mark | Maximum stress/N/mm 2 | Unit elongation 〉=/% | Relative reduction in area 〉=/% | Hardness HB/≤ |
| Y15 | 390～540 | ?22 | ?36 | ?170 |
| Y15Pb | 390～540 | ?22 | ?36 | ?170 |
| Y20 | 450～600 | ?20 | ?30 | ?175 |
| Y45Ca | 600～745 | ?12 | ?26 | ?241 |
Claims (6)
1. tin-containing free cutting steel is characterized in that the major ingredient (Wt%) of this steel grade is:
C：0.18～0.22、Si：0.40～0.60、Mn：0.65～1.00、P：0.05～0.08、S：0.15～0.28、
Sn：0.01～0.05。
2. tin-containing free cutting steel as claimed in claim 1, what it is characterized in that this steel grade uses in smelting is neutral thin covering slag, its composition is CaO35%, SiO
235%, Al
2O
330%.
3. tin-containing free cutting steel as claimed in claim 1 or 2 is characterized in that method of deoxidation and step that this steel grade smelt to adopt: main with ferromanganese or add the aluminium ash or the carbon dust that contain aluminium about 20% on a small quantity and carry out diffusive deoxidation.
4. as claim 1 or 2 or 3 described tin-containing free cutting steels, it is characterized in that the oxygen activity in the quick Determining oxygen probe mensuration of this steel grade smelting employing zirconia solid electrolyte oxygen concentration cell molten steel, feed the preceding molten steel oxygen activity of silk and should be controlled at 70～200 * 10
-6
5. as claim 1 or 2 or 3 or 4 described tin-containing free cutting steels, it is characterized in that this steel grade smelting employing Argon or induction stirring technology.
6. as claim 1 or 2 or 3 or 4 or 5 described tin-containing free cutting steels, it is characterized in that it is 3-8 minute that this steel grade is smelted time of repose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031196322A CN1195092C (en) | 2003-03-18 | 2003-03-18 | Tin containing free-cutting steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031196322A CN1195092C (en) | 2003-03-18 | 2003-03-18 | Tin containing free-cutting steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1450192A true CN1450192A (en) | 2003-10-22 |
| CN1195092C CN1195092C (en) | 2005-03-30 |
Family
ID=28684395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031196322A Expired - Fee Related CN1195092C (en) | 2003-03-18 | 2003-03-18 | Tin containing free-cutting steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1195092C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101578383B (en) * | 2006-12-28 | 2011-04-20 | Posco公司 | Eco-friendly pb-free free cutting steel with excellent machinability and hot workability |
| CN106978570A (en) * | 2017-03-17 | 2017-07-25 | 北京科技大学 | A kind of automatic steel containing compared with high tin content and preparation method |
-
2003
- 2003-03-18 CN CNB031196322A patent/CN1195092C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101578383B (en) * | 2006-12-28 | 2011-04-20 | Posco公司 | Eco-friendly pb-free free cutting steel with excellent machinability and hot workability |
| CN106978570A (en) * | 2017-03-17 | 2017-07-25 | 北京科技大学 | A kind of automatic steel containing compared with high tin content and preparation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1195092C (en) | 2005-03-30 |
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| ASS | Succession or assignment of patent right |
Owner name: LAIWU IRON & STEEL GROUP CO., LTD. Free format text: FORMER OWNER: BEIJING UNIV. OF SCIENCE AND TECHNOLOGY Owner name: BEIJING UNIV. OF SCIENCE AND TECHNOLOGY Effective date: 20040709 |
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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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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |