CN1184342C - Rare earth series easy cutting steel - Google Patents
Rare earth series easy cutting steel Download PDFInfo
- Publication number
- CN1184342C CN1184342C CN 02153021 CN02153021A CN1184342C CN 1184342 C CN1184342 C CN 1184342C CN 02153021 CN02153021 CN 02153021 CN 02153021 A CN02153021 A CN 02153021A CN 1184342 C CN1184342 C CN 1184342C
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- CN
- China
- Prior art keywords
- steel
- cutting
- rare earth
- free
- deoxidation
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- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention belongs to the field of metal materials, particularly to free cutting steel containing rare earth elements. The present invention can be used for making important standard parts of vehicles and machines such as high strength bolts, etc. The present invention adopts the measures such as neutral coverage slag molten steel, diffusible desoxydation, deoxidation controlled by calcium silicon alloys in a thread feeding method, the deteriorated impurities of rare earth alloys, the quick oxygen quantitation of solid electrolyte oxygen concentration cells, etc. A novel free cutting steel grade with superior mechanical properties and easy cutting properties is produced. When a high speed steel tool is used for a cutting test at medium/low grade cutting speed (25 m/min), the steel grade has superior free cutting properties. The test result of an MTS810 type material testing machine indicates that the steel has excellent mechanical properties. The tensile strength of samples reaches from 500 to 570MPa, an elongation rate is from 25 to 30%, and the contraction of a cutting area is from 40 to 50%. The present invention reaches the standard of an approximate steel grade (Y20, Y15Pb) in a Chinese standard GB8731-88. The mechanical properties of the present invention are superior to the mechanical properties of a base steel Q235 steel.
Description
Technical field
The invention belongs to metal material field, particularly a kind of free-cutting steel that contains rare earth element 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.
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 rare earth series free-cutting steel, be called the Y20CaRE free-cutting steel, it is characterized in that the composition weight percent is: C:0.12～0.22, Si:0.50～1.00, Mn:0.65～0.95, P:0.02～0.10, S:0.03～0.28, Ca:0.002～0.009, RE:0.01～0.10, Fe is surplus.In order to improve the rate of recovery of rare earth, the present invention carries out pre-deoxidation with ferromanganese earlier, adds Iron sulfuret, and to adjust the sulphur content in the steel, recycle silicon calcium alloy cored-wire is controlled deoxidation to molten steel, inserts No. 1 mishmetal ferro-silicon in packet header to molten steel at last.
The optimal components weight percent of rare earth series free-cutting steel is: C:0.18～0.22, Si:0.50～0.70, Mn:0.65～0.95, P:0.03～0.05, S:0.15～0.25, Ca:0.004～0.005, RE:0.01～0.03, Fe is surplus.
The chemical property and the alkaline-earth metal of rare earth element are close, oxygen, sulphur there is very strong avidity, sulfide and oxide inclusion in the modified steel effectively, thereby can suppress the anisotropy of resulfurizing series free cutting steel effectively, because rare-earth sulfide and oxysulfide proportion are bigger, quite a few sulphur is stayed in the steel with inclusion morphology, helps improving the free cutting property of steel.
The thin covering slag of employed neutrality in the smelting, its composition is CaO20-35%, SiO
225-40%, Al
2O
330-40%.
Adopt suitable method of deoxidation and step: at first add the aluminium ash that contains aluminium 20-40% on a small quantity and carry out diffusive deoxidation with ferromanganese, add Iron sulfuret, to adjust the sulphur content in the steel, adopt hello the inner Ca-Si of insertion of a silk normal direction molten steel cored-wire to control deoxidation and insert rare earth ferrosilicon alloy at last.
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 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 excellence of Y20CaRE series free-cutting steel, the tensile strength of hot rolling (forging) attitude sample reaches 500～570MPa, unit elongation is 25～30%, relative reduction in area 40～50%, the standard that has surpassed corresponding steel grade among the GB GB8731-88 (Y20, Y15Pb) also increases than the mechanical property of its basic steel Q235 steel.
Embodiment
A kind of rare earth series free-cutting steel, electric arc furnace smelting add electromagnetism and stir, and the composition weight percent is: C:0.20, Si:0.60, Mn:0.80, P:0.03, S:0.20, Ca:0.004, RE:0.02, Fe is surplus.
Use neutral thin covering slag in the smelting, its composition is CaO30%, SiO
235%, Al
2O
335%.
In order to improve the rate of recovery of rare earth, the present invention carries out pre-deoxidation with ferromanganese earlier, adds Iron sulfuret, and to adjust the sulphur content in the steel, recycle silicon calcium alloy cored-wire is controlled deoxidation to molten steel, inserts No. 1 mishmetal ferro-silicon in packet header to molten steel at last.
This 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.
Claims (3)
1. rare earth series free-cutting steel, be called the Y20CaRE free-cutting steel, it is characterized in that the composition weight percent is: C:0.12～0.22, Si:0.50～1.20, Mn:0.65～0.95, P:0.02～0.10, S:0.03～0.28, Ca:0.002～0.009, RE:0.01～0.10, Fe is surplus.
2. Y20CaRE free-cutting steel as claimed in claim 1, it is characterized in that the composition weight percent is: C:0.18～0.22, Si:0.50～0.70, Mn:0.65～0.95, P:0.03～0.05, S:0.15～0.25, Ca:0.004～0.005, RE:0.01～0.03, Fe is surplus.
3. the production method of Y20CaRE free-cutting steel as claimed in claim 1 or 2 is characterized in that smelting and adopts top blast or bottom argon blowing technology and induction stirring technology, smelts the type of furnace: electric arc furnace, induction furnace and converter; Use neutral thin covering slag 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 the ferromanganese deoxidation or add the aluminium ash that contains aluminium 20-40% and carry out diffusive deoxidation, add Iron sulfuret, to adjust the sulphur content in the steel, adopt hello the inner Ca-Si of insertion of a silk normal direction molten steel cored-wire to control deoxidation and insert rare earth ferrosilicon alloy at last; Adopt the oxygen activity in the quick Determining oxygen probe mensuration of the zirconia solid electrolyte oxygen concentration cell molten steel, a hello amount is fixed according to steel grade and recovery rate, and hello a preceding molten steel oxygen activity should be controlled at 40～200 * 10
-6
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02153021 CN1184342C (en) | 2002-11-29 | 2002-11-29 | Rare earth series easy cutting steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02153021 CN1184342C (en) | 2002-11-29 | 2002-11-29 | Rare earth series easy cutting steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1410582A CN1410582A (en) | 2003-04-16 |
| CN1184342C true CN1184342C (en) | 2005-01-12 |
Family
ID=4752190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02153021 Expired - Fee Related CN1184342C (en) | 2002-11-29 | 2002-11-29 | Rare earth series easy cutting steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1184342C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101845535B (en) * | 2010-05-19 | 2012-05-30 | 首钢总公司 | Method for improving nitrogen yield of ferrosilicon nitride |
| CN112063923B (en) * | 2020-09-07 | 2022-03-22 | 成都先进金属材料产业技术研究院股份有限公司 | 1300 MPa-grade RE-containing chalcogenide free-cutting steel 60mm bar and preparation method thereof |
| CN114086061B (en) * | 2021-10-28 | 2023-03-03 | 马鞍山钢铁股份有限公司 | 6.8-grade corrosion-resistant cold forging steel and production method thereof |
-
2002
- 2002-11-29 CN CN 02153021 patent/CN1184342C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1410582A (en) | 2003-04-16 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050112 Termination date: 20151129 |