CN103060669A - Sintering machine heat insulation pad material and thermal treatment method of same - Google Patents
Sintering machine heat insulation pad material and thermal treatment method of same Download PDFInfo
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- CN103060669A CN103060669A CN2013100097110A CN201310009711A CN103060669A CN 103060669 A CN103060669 A CN 103060669A CN 2013100097110 A CN2013100097110 A CN 2013100097110A CN 201310009711 A CN201310009711 A CN 201310009711A CN 103060669 A CN103060669 A CN 103060669A
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Abstract
The invention relates to the field of the production of nodular cast iron, and specifically relates to a sintering machine heat insulation pad material and a thermal treatment method of the same. The sintering machine heat insulation pad material is characterized by comprising the following chemical components in weight percentage: 3.6-3.8% of C, 2.6-2.8% of Si, 0.4-0.6% of Mn, less than 0.1% of P, less than 0.04% of S, 0.5-1.0% of Ni and 0.3-0.5% of Mo, and the balance of Fe. The thermal treatment method of the above material is characterized by comprising the following technical steps of: firstly, heating a workpiece to 740-760 DEG C at a speed of 70-100 DEG C/h, preserving heat for 5-6 hours, cooling the workpiece to 580-620 DEG C by furnace cooling, and cooling to room temperature by air cooling. In comparison with the prior art, the material and the thermal treatment method of the same have the positive effect that by the improvement to the ingredients and the thermal treatment technology of the nodular cast iron, the flexibility and the thermal shock resistance of products are improved, and the heat insulation service life is prolonged from the original 20 months to more than 30 months.
Description
Technical field
The present invention relates to the spheroidal graphite cast iron production field, be specifically related to a kind of sintering machine heat insulation pad material and heat treating method thereof.
Background technology
QT450-10 is the national standard casting magnesium iron trade mark, is widely used.Use QT450-10 to produce the existing more than ten years history of sintering machine heat insulation pad, but because the surging force that the high-temperature service that continues and pallet produce when stone easily causes the heat insulating mattress damage, need often to change, the most abrasion loss of the heat insulating mattress that changes is all little, the major cause of damage is cracking and fracture, and spare part fails to play one's part to the full.
Summary of the invention
The purpose of this invention is to provide a kind of sintering machine heat insulation pad material and heat treating method thereof, overcome the deficiencies in the prior art, improve the spheroidal graphite cast iron system component, disperse distribution graphite pebbles in finally forming take ferrite as main tissue, improve the viscous deformation under the strength of materials and the condition of high temperature, improve sintering machine heat insulation pad work-ing life.
For achieving the above object, the present invention is achieved by the following technical solutions:
A kind of sintering machine heat insulation pad material, its chemical composition content is by weight percentage:
C 3.6～3.8%, Si 2.6～2.8%, Mn 0.4～0.6%, P＜0.1%, S＜0.04%, Ni 0.5～1.0%, Mo 0.3～0.5%, all the other are Fe.
A kind of sintering machine heat insulation pad material, the content of its chemical ingredients is preferably by weight percentage:
C 3.6～3.8%, Si 2.6～2.8%, Mn 0.4～0.6%, P＜0.1%, S＜0.04%, Ni 0.7～0.9%, Mo 0.4～0.5%, all the other are Fe.
The heat treating method of above-mentioned a kind of sintering machine heat insulation pad material, its thermal treatment process is: first workpiece is heated to 740～760 ℃ with 70～100 ℃/hour temperature rise rate, after the soaking time 5～6 hours, furnace cooling to 580～620 ℃, air cooling is to room temperature again, final form take ferrite as main tissue in disperse distribution graphite pebbles.
Compared with prior art, the invention has the beneficial effects as follows: improved spheroidal graphite cast iron system component and thermal treatment process, nickel element can increase austenite content and refine pearlite, thermal shock resistance is good, and molybdenum element energy Effective Raise thermal fatigue resistance, improve the toughness of product and the ability of heat shock resistance by adding these two kinds of materials, extended to 30 month or more from original 20 months the work-ing life of heat insulating mattress.
Description of drawings
Fig. 1 is heat treatment cycle curve figure of the present invention.
Embodiment
The invention will be further described below in conjunction with embodiment:
A kind of sintering machine heat insulation pad material of the present invention, add alloying constituent nickel and molybdenum and improve the toughness of product and the ability of heat shock resistance, for obtaining to obtain by rational thermal treatment process, after finishing cast molding take ferrite as main body and disperse distribution graphite pebbles, see Fig. 1, carry out following thermal treatment, process is: first workpiece is heated to 740～760 ℃ with 70～100 ℃/hour temperature rise rate, soaking time is after 5～6 hours, furnace cooling to 580～620 ℃, air cooling is to room temperature again.
In order to improve the intensity of spheroidal graphite cast iron, when smelting, in nodularization, in bag, carry out again inoculation, to alleviate the chilling tendency of foundry goods.The nickel element not burning considers that molybdenum element has the scaling loss amount about 2% in middle frequency furnace, in when batching the scaling loss amount is just joined and can satisfy production.Add molybdenum, two kinds of elements of nickel, the refinement nucleus can Ferrite Refinement when guaranteeing thermal treatment in process of setting can to make foundry goods, the enhancing body toughness, thus reach service requirements.
The ferrite body requires silicone content higher in the material of the present invention, forms the carbide of minute quantity when guaranteeing as cast condition, and carbon forms graphite pebbles by the nodularization process basically.Embodiment of the invention chemical ingredients and performance perameter such as following table 1.
Table 1
Embodiment of the invention heat treatment parameter is seen such as following table 2.
Table 2
Claims (3)
1. a sintering machine heat insulation pad material is characterized in that, its chemical composition content is by weight percentage:
C 3.6～3.8%, Si 2.6～2.8%, Mn 0.4～0.6%, P＜0.1%, S＜0.04%, Ni 0.5～1.0%, Mo 0.3～0.5%, all the other are Fe.
2. described a kind of sintering machine heat insulation pad material according to claim 1 is characterized in that the content of its chemical ingredients is preferably by weight percentage:
C 3.6～3.8%, Si 2.6～2.8%, Mn 0.4～0.6%, P＜0.1%, S＜0.04%, Ni 0.7～0.9%, Mo 0.4～0.5%, all the other are Fe.
3. the heat treating method of a sintering machine heat insulation pad material, it is characterized in that its thermal treatment process is: first workpiece is heated to 740～760 ℃ with 70～100 ℃/hour temperature rise rate, soaking time is after 5～6 hours, furnace cooling to 580～620 ℃, air cooling is to room temperature again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100097110A CN103060669A (en) | 2013-01-10 | 2013-01-10 | Sintering machine heat insulation pad material and thermal treatment method of same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100097110A CN103060669A (en) | 2013-01-10 | 2013-01-10 | Sintering machine heat insulation pad material and thermal treatment method of same |
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| CN103060669A true CN103060669A (en) | 2013-04-24 |
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| CN2013100097110A Pending CN103060669A (en) | 2013-01-10 | 2013-01-10 | Sintering machine heat insulation pad material and thermal treatment method of same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104630608A (en) * | 2015-02-04 | 2015-05-20 | 东洋铁球（马鞍山）有限公司 | Heat-resistant sphere and production process thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60177125A (en) * | 1984-02-22 | 1985-09-11 | Toyota Motor Corp | Manufacture of tough and hard cast iron |
| US4702886A (en) * | 1986-10-09 | 1987-10-27 | Romac Industries Inc. | Corrosion resistant nickel alloyed ductile cast iron of ferrite structure |
| CN1670233A (en) * | 2004-02-12 | 2005-09-21 | 科技有限责任公司 | Process for producing cast pieces of spheroidal graphite with high geometrical and dimensional precision and improved mechanical properties |
-
2013
- 2013-01-10 CN CN2013100097110A patent/CN103060669A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60177125A (en) * | 1984-02-22 | 1985-09-11 | Toyota Motor Corp | Manufacture of tough and hard cast iron |
| US4702886A (en) * | 1986-10-09 | 1987-10-27 | Romac Industries Inc. | Corrosion resistant nickel alloyed ductile cast iron of ferrite structure |
| CN1670233A (en) * | 2004-02-12 | 2005-09-21 | 科技有限责任公司 | Process for producing cast pieces of spheroidal graphite with high geometrical and dimensional precision and improved mechanical properties |
Non-Patent Citations (1)
| Title |
|---|
| 戴斌煜: "硅锰钼耐热球铁的研制", 《铸造》, vol. 55, no. 12, 31 December 2006 (2006-12-31) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104630608A (en) * | 2015-02-04 | 2015-05-20 | 东洋铁球（马鞍山）有限公司 | Heat-resistant sphere and production process thereof |
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Application publication date: 20130424 |