CN103820699A - Chemical components for producing QT 450-10 type spheroidal graphite cast iron - Google Patents
Chemical components for producing QT 450-10 type spheroidal graphite cast iron Download PDFInfo
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- CN103820699A CN103820699A CN201210464041.7A CN201210464041A CN103820699A CN 103820699 A CN103820699 A CN 103820699A CN 201210464041 A CN201210464041 A CN 201210464041A CN 103820699 A CN103820699 A CN 103820699A
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- cast iron
- spheroidal graphite
- graphite cast
- producing
- iron
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- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 18
- 239000000126 substance Substances 0.000 title claims abstract description 18
- 239000000203 mixture Substances 0.000 claims description 15
- 239000004615 ingredient Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 6
- MHKWSJBPFXBFMX-UHFFFAOYSA-N iron magnesium Chemical compound [Mg].[Fe] MHKWSJBPFXBFMX-UHFFFAOYSA-N 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000011081 inoculation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910002058 ternary alloy Inorganic materials 0.000 description 1
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a novel chemical component formula for producing QT 450-10 type spheroidal graphite cast iron. The chemical component formula is characterized by comprising the following chemical ingredients in weight percentage: 3.20-3.50% of Si, 0.10-0.30% of Mn and 3.30-3.50% of C to produce the QT 450-10 type spheroidal graphite cast iron.
Description
Technical field
The present invention relates in QT450-10 grade nodular cast iron production process a kind of new chemical composition proportion adopting for improving mechanical property and homogeneity of structure.
Background technology
Spheroidal graphite cast iron, since invention, has been devoted to develop the foundry goods of high strength, high-elongation and good machinability always.Traditional Production Technology of Ductile Iron,, when first-generation Production Technology of Ductile Iron Fe-C-Si ternary alloy system phasor stable solidification, 2% one 3% w (Si) amount promotes Graphite Precipitation, the mechanical property of magnesium iron is combined with high ductibility from the low strength of pure ferrite, through ferrite+pearlitic intermediate state, be combined with low ductility to complete pearlitic high strength.As can be seen here, first-generation magnesium iron is to reach high strength with build up (obtaining the either pearlite occurred of higher share) to require.The maximum disadvantage of this production technique is: the main drawback that first-generation magnesium iron can be described with ferrite type magnesium iron trade mark QT450-10 in ISO 1083 standards.This trade mark has the combination of medium tenacity and medium ductility, and the ratio of its ferrite and pearlite is very responsive to initial austenitic matrix Local cooling speed, also changes with the content of Mn and this pearlite-like stable element of Cu.This susceptibility to cooling rate and composition makes the hardness of the spheroidal graphite cast iron 30-40 Bu Shi unit that is easy to fluctuate, and corresponding intensity and ductility also can change.This performance inconsistency not only results from the different wall place of foundry goods, also results from the same area with batch different foundry goods, and the foundry goods difference of different batches is larger.Thereby the hardness allowed band of QT450-10 trade mark magnesium iron is 160～210 HBW in ISO 1083 standards, so large changes in hardness scope has consumed tolerance surplus, makes complete processing optimize several falling flat.
Summary of the invention
The invention provides a kind of novel chemical composition proportioning, solved same foundry goods different wall and same batch of different foundry goods, the shortcoming that hardness is inhomogeneous.
This new chemical composition proportion of producing for spheroidal graphite cast iron, it is characterized in that: use w (Si) 3.20%-3.50%, w (Mn) 0.10%～0.30%, the chemical composition proportioning of w (C) 3.30%～3.50% is produced the spheroidal graphite cast iron of the QT450-10 trade mark.Improve si content, with si solution strengthening ferrite replacement pearlite matrix, can improve mechanical property and machinability, and not sacrifice thermal characteristics.Along with w (si) amount increases, the hardness of ferritic spheroidal graphite cast iron has increased slightly, and changes in hardness scope sharply reduces.In the time that w (si) quantitative change remains in 0.1%, changes in hardness scope is conventionally 5～10 Bu Shi units; Every increase w (Si) amount 0.1%, elongation at break reduces by 0.323%, and tensile strength increases by 9.29 MPa at mean value 540 MPa places, and yield strength increases by 13.8 MPa at mean value 400 MPa places.W (Mn) amount can be compared with the impact that adds (Si) amount the impact of ferritic spheroidal graphite cast iron.Add (Mn) and measure every increase by 0.1%, make yield strength increase by 7.4 MPa (only having the half of Si effect), on tensile strength impact little (0.8 MPa declines); But increase Mn, the speed (every increasing 0.1%, A δ declines 1.83%) that elongation at break declines is 6 times with amount si.This means, in high w (Si) amount situation, low-level adding (Mn) amount can not cause perlite to be separated out, although ductility on high level, Mn asks that at the crystalline substance of after coagulation part regional segregation still can be harmful to ductility.Thereby, add in w (Mn) amount and be limited to 0.3%; W (Mn) amount further reduces, even lower than 0.2%, and may be more favourable to ductility.
When production, use medium-frequency induction furnace fusing molten iron, the composition of base iron is adjusted into w (Si) 2.0%-2.3%, w (Mn) 0.10%～0.30%, w (C) 3.40%～3.60%, then obtains finally pouring into a mould the chemical composition of product through stokehold spheroidization and inoculation processing.
Compared with prior art, because invention spheroidal graphite cast iron chemical composition proportioning has solved the larger problem of casting hardness fluctuation that original production process is produced, greatly improved the processing characteristics of product.In addition, the spheroidal graphite cast iron product that uses the utility model technology to produce has high mechanical property, high quality nodular iron casting that can the stably manufactured QT450-10 trade mark.
Embodiment
First, determine the applicable parameter such as chemical composition, teeming temperature according to the structure of QT540-10 trade mark specific product.
Use medium-frequency induction furnace melt iron, be warmed up to more than 1450 ℃ sampling and detect chemical composition, final base iron chemical composition is adjusted to w (Si) 2.0%-2.3%, w (Mn) 0.10%～0.30%, molten iron discharging heats up after w (C) 3.40%～3.60%.Molten iron discharging temperature is controlled at 1490 ℃-1520 ℃, and stokehold is used pit method to carry out spheroidizing, and then carries out inoculation in the process of subcontracting toward casting molding machine, carries out current-following inoculation processing, pregnant amount 0.1% when cast.
Adopt this chemical composition proportioning mode, we have carried out production in batches, have greatly improved us and produce mechanical property and the machinability of QT450-10 trade mark product.
Claims (1)
1. this new chemical composition proportion of producing for spheroidal graphite cast iron, it is characterized in that: use w (Si) 3.20%-3.50%, w (Mn) 0.10%～0.30%, the chemical composition proportioning of w (C) 3.30%～3.50% is produced the spheroidal graphite cast iron of the QT450-10 trade mark.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210464041.7A CN103820699A (en) | 2012-11-19 | 2012-11-19 | Chemical components for producing QT 450-10 type spheroidal graphite cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210464041.7A CN103820699A (en) | 2012-11-19 | 2012-11-19 | Chemical components for producing QT 450-10 type spheroidal graphite cast iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103820699A true CN103820699A (en) | 2014-05-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210464041.7A Pending CN103820699A (en) | 2012-11-19 | 2012-11-19 | Chemical components for producing QT 450-10 type spheroidal graphite cast iron |
Country Status (1)
| Country | Link |
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| CN (1) | CN103820699A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109182638A (en) * | 2018-11-06 | 2019-01-11 | 河北恒工机械装备科技有限公司 | A kind of big cross section round bar spheroidal graphite cast-iron profile and preparation method thereof |
| CN109837454A (en) * | 2019-04-08 | 2019-06-04 | 河北恒工机械装备科技有限公司 | A kind of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile and preparation method thereof |
-
2012
- 2012-11-19 CN CN201210464041.7A patent/CN103820699A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109182638A (en) * | 2018-11-06 | 2019-01-11 | 河北恒工机械装备科技有限公司 | A kind of big cross section round bar spheroidal graphite cast-iron profile and preparation method thereof |
| CN109837454A (en) * | 2019-04-08 | 2019-06-04 | 河北恒工机械装备科技有限公司 | A kind of big cross section high-intensity and high-tenacity spheroidal graphite cast-iron profile and preparation method thereof |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140528 |