CN108467986A - A kind of method of smelting of mold cylinder iron - Google Patents
A kind of method of smelting of mold cylinder iron Download PDFInfo
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- CN108467986A CN108467986A CN201810175108.2A CN201810175108A CN108467986A CN 108467986 A CN108467986 A CN 108467986A CN 201810175108 A CN201810175108 A CN 201810175108A CN 108467986 A CN108467986 A CN 108467986A
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- iron
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The present invention provides a kind of method of smelting of mould cast cylinder iron, include the following steps：(1) steel scrap and the pig iron are mixed in proportion, is melted；(2) each element ratio in molten iron is adjusted；(3) tin is put at 1,360 1400 DEG C, the additive amount of tin is 0.06 0.08wt%；(4) cathode copper is placed in ladle bottom, is reconstituted with molten iron.The present invention just has industrial steel scrap as primary raw material, turns waste into wealth, and has obtained the cast iron materials for being suitable for mould cast and using with good mechanical properties and cutting ability.
Description
Technical field
The present invention relates to metallurgical technology fields, and in particular to a kind of method of smelting of cast iron.
Background technology
The steel scrap generated in steel plant's production process is known as " recirculating scrap ", " self-produced steel scrap " or " cycle steel scrap ".It contains
Carbon amounts is generally less than 2.0%, and sulphur, phosphorus content are no more than 0.05%.The steel scrap generated in steel products and industrial manufacturing process,
Account for about the 20~25% of steel scrap total amount, the predominantly cropping of steel material, back-end crop, chip, leftover pieces etc..Various used facilities, steel knot
Component, locomotive, vehicle, rail, automobile, ship, tool, apparatus of " scrapping " etc. also generate a large amount of " depreciation steel scraps ".It is in work
Industry developed country accounts for about the 25~30% of steel scrap total amount, accounts for the 1~1.5% of the total injected volume of steel in society.Cast iron die is casting
Common mold in field is made, main component is the pig iron, close with the ingredient of steel scrap.It is a kind of using useless therefore, it is necessary to research and develop
Steel makes steel scrap turn waste into wealth for the technique of cast iron die, economizes on resources.
Invention content
The object of the present invention is to provide a kind of method of smelting of mold cylinder iron, this method using steel scrap and the pig iron as raw material,
By the way that the element and adjustment melting step of specific proportioning is added, obtain having good mechanical properties and cutting ability is suitable for mould
The cast iron materials that tool casting uses.
A kind of method of smelting of mould cast cylinder iron, includes the following steps：
(1) steel scrap is first put into electric furnace, then descends the pig iron, heating power is adjusted to 400KW, kept for 10 minutes, then
It is gradually increased in 15 minutes to 680KW, until steel scrap and the pig iron melt；
(2) after steel scrap and the pig iron are completely melt, the constituent content of molten iron is adjusted, wherein：Carbon：3.28-3.32wt%, silicon：
1.6-1.9wt%, manganese：0.6-0.9wt%, phosphorus：0.03-0.05wt%, sulphur：0.08-0.1wt%, chromium：0.2-0.35%；
(3) tin is put at 1360-1400 DEG C, the additive amount of tin is 0.06-0.08wt%；
(4) cathode copper is placed in ladle bottom, is reconstituted with the molten iron of step (3) when coming out of the stove, copper content 0.8-
1.0wt%.
Preferably, in step (1), steel scrap accounts for 20-50%.
Preferably, in step (1), heating power is adjusted to 400KW, is kept for 10 minutes, then increases heating power
To 500KW, kept for 5 minutes；Heating power is increased to 600 KW again, is kept for 6 minutes；Heating power is increased to 680KW again.
Preferably, in step (2), chromium and manganese are put into togerther in the molten iron of fusing.
Preferably, 1500 ± 20 DEG C of the temperature of step (4).
Wherein, the various elements of addition primarily serve following effect：
Chromium：It can play the role of post-curing, enhance the intensity and hardness of cast iron.When chromium content is more than 0.35%,
Matrix can be promoted cementite occur, to reduce the cutting ability of cast iron.
Silicon：The pernicious gases such as the oxygen in molten iron can be sloughed, matrix is refined.When silicone content is more than 2%, can show
Writing reduces the intensity and toughness of cast iron.
Manganese：Manganese is good deoxidier and desulfurizing agent, can promote the refinement of cast iron medium pearlite, while being conducive to eliminate
The illeffects of sulphur, when manganese content is less than 0.6%, manganese role is not notable.
Copper：The content for increasing refinement pearlite, improves the cutting ability of cast iron.
Sulphur：The cutting ability for improving cast iron, enhances the pregnant effect of cast iron.When sulfur content is higher than 0.1%, it may appear that partially
Analysis.
Phosphorus：The intensity and hardness for improving cast iron cause segregation serious so that cast iron is easy when phosphorus content is higher than 0.05%
Cracking.
Tin：The intensity and hardness for effectively improving cast iron, increase the content of pearlite in alloy of cast iron.
The cast iron prepared using method of smelting of the present invention increases the content of pearlite in alloy of matrix, improves the machine of casting
Tool performance and cutting ability, wherein tensile strength reach 283N/mm2More than, Brinell hardness is 185 or more.
Specific implementation mode
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
The every other embodiment that technical staff is obtained without making creative work belongs to the model that the present invention protects
It encloses.
Embodiment 1
A kind of method of smelting of mould cast cylinder iron, includes the following steps：
(1) steel scrap is first put into electric furnace, then descends the pig iron, heating power is adjusted to 400KW, kept for 10 minutes, then
Heating power is increased to 500KW, is kept for 5 minutes；Heating power is increased to 600KW again, is kept for 6 minutes；Work(will be heated again
Rate is increased to 680KW.Until steel scrap and the pig iron melt；Wherein steel scrap accounts for the 20% of total weight, and the pig iron accounts for the 80% of total weight.
(2) after steel scrap and the pig iron are completely melt, the constituent content of molten iron is adjusted, wherein：Carbon：3.31wt%, silicon：
1.8wt%, manganese：0.75wt%, phosphorus：0.04wt%, sulphur：0.085wt%, chromium：0.32%；
(3) tin is put at 1400 DEG C, the additive amount of tin is 0.07wt%；
(4) cathode copper, copper content 0.9wt% are placed in ladle bottom；It is reconstituted with the molten iron of step (3) when coming out of the stove,
Temperature is maintained at 1490 DEG C.
After testing, which is 99%, and tensile strength reaches 280N/mm2, Brinell hardness 185.
Embodiment 2
A kind of method of smelting of mould cast cylinder iron, includes the following steps：
(1) steel scrap is first put into electric furnace, then descends the pig iron, heating power is adjusted to 400KW, kept for 10 minutes, then
Heating power is increased to 500KW, is kept for 5 minutes；Heating power is increased to 600KW again, is kept for 6 minutes；Work(will be heated again
Rate is increased to 680KW.Until steel scrap and the pig iron melt；Wherein steel scrap accounts for the 50% of total weight, and the pig iron accounts for the 50% of total weight.
(2) after steel scrap and the pig iron are completely melt, the constituent content of molten iron is adjusted, wherein：Carbon：3.3wt%, silicon：
1.75wt%, manganese：0.8wt%, phosphorus：0.035wt%, sulphur：0.09wt%, chromium：0.25%；
(3) tin is put at 1380 DEG C, the additive amount of tin is 0.07wt%；
(4) cathode copper, copper content 0.95wt% are placed in ladle bottom；It is rushed with the molten iron of step (3) when coming out of the stove
It adjusts, temperature is maintained at 1490 DEG C.
After testing, which is 100%, and tensile strength reaches 287N/mm2, Brinell hardness is
198。
Comparative example 1
A kind of cupro-nickel cast iron die material, be prepared from the following ingredients in percentage by carry out melting and cast be made：
Carbon 3~4%, copper 0.4~0.7%, silicon 1.9~2.2%, manganese 0.65~0.8%, molybdenum 0.1~0.2%, nickel 0.6~
0.8%, phosphorus 0.03~0.04%, sulphur 0.02~0.05%, chromium 0.12~0.2%, titanium 0.18~0.2%, vanadium 0.03~
0.05%, remaining is Fe and common impurity.
Prepare new iron material and scrap mould material first, chemical examination obtains specific component content, according to said components weight
Range is added into row element, is mixed into raw material.
Raw material components are melted, the heating temperature range of the melting is too low to be unable to fully at 1480~1550 DEG C
Fusion.It is fully poured into a mould after fusion, the temperature range of the cast is at 1350~1400 DEG C.Cast is quick, Yi Mianwen
Degree reduces and influences mobility, reduces defect.
The copper-nickel cast iron die material also needs to twice annealing technique.Annealing is that molding mold materials are put for the first time
It is heated to 1000 DEG C in the lehr, furnace cooling after keeping the temperature 5 hours, temperature carries out second after being down to 250 DEG C and anneals, the
Mold materials are heated to 800 DEG C by double annealing, and room temperature is cooled to the furnace after keeping the temperature 3 hours.
After testing, which is 95-98%, tensile strength 250-272N/mm2, Bu Shi is hard
Degree is 145-160.
Claims (5)
1. a kind of method of smelting of mould cast cylinder iron, which is characterized in that include the following steps：
(1) steel scrap is first put into electric furnace, then descends the pig iron, heating power is adjusted to 400KW, is kept for 10 minutes, then 15
It is gradually increased to 680KW in minute, until steel scrap and the pig iron melt；
(2) after steel scrap and the pig iron are completely melt, the constituent content of molten iron is adjusted, wherein：Carbon：3.28-3.32wt%, silicon：1.6-
1.9wt%, manganese：0.6-0.9wt%, phosphorus：0.03-0.05wt%, sulphur：0.08-0.1wt%, chromium：0.2-0.35%；
(3) tin is put at 1360-1400 DEG C, the additive amount of tin is 0.06-0.08wt%；
(4) cathode copper is placed in ladle bottom, is reconstituted with the molten iron of step (3) when coming out of the stove, copper content 0.8-1.0wt%.
2. method of smelting according to claim 1, which is characterized in that in step (1), steel scrap accounts for
20-50%.
3. according to the method for smelting described in claim 1-2, which is characterized in that in step (1), heating power is adjusted to
400KW is kept for 10 minutes, then increases heating power to 500KW, kept for 5 minutes；Heating power is increased to 600KW again,
It is kept for 6 minutes；Heating power is increased to 680KW again.
4. according to the method for smelting described in claim 1-2, which is characterized in that in step (2), chromium and manganese are put into togerther fusing
In molten iron.
5. method of smelting according to claim 1, which is characterized in that 1500 ± 20 DEG C of the temperature of step (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810175108.2A CN108467986B (en) | 2018-03-02 | 2018-03-02 | Smelting method of cast iron for mold |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810175108.2A CN108467986B (en) | 2018-03-02 | 2018-03-02 | Smelting method of cast iron for mold |
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| CN108467986A true CN108467986A (en) | 2018-08-31 |
| CN108467986B CN108467986B (en) | 2021-04-06 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103060664A (en) * | 2011-10-19 | 2013-04-24 | 柳州市普和金属加工有限责任公司 | Casting technology for grey cast iron material of brake disc |
| CN103484753A (en) * | 2013-09-02 | 2014-01-01 | 宁波康发铸造有限公司 | Novel as-cast 500-7 nodular cast iron |
| CN104313232A (en) * | 2014-10-14 | 2015-01-28 | 株洲联诚集团有限责任公司 | Alloy gray cast iron material for locomotive brake disc, and casting method of alloy gray cast iron material |
| CN105401065A (en) * | 2015-11-28 | 2016-03-16 | 西峡县西泵特种铸造有限公司 | Production process of high-strength alloyed gray iron hydraulic valve body part |
| CN106011610A (en) * | 2016-07-29 | 2016-10-12 | 西峡县内燃机进排气管有限责任公司 | High-strength nodular cast iron QT900-6 and preparation method thereof |
| CN106048401A (en) * | 2016-08-15 | 2016-10-26 | 合肥江淮铸造有限责任公司 | Smelting and pouring process of gasoline engine cylinder body |
| CN106222533A (en) * | 2016-08-15 | 2016-12-14 | 合肥江淮铸造有限责任公司 | The pouring molten iron of a kind of diesel engine cylinder block and smelting technology |
-
2018
- 2018-03-02 CN CN201810175108.2A patent/CN108467986B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103060664A (en) * | 2011-10-19 | 2013-04-24 | 柳州市普和金属加工有限责任公司 | Casting technology for grey cast iron material of brake disc |
| CN103484753A (en) * | 2013-09-02 | 2014-01-01 | 宁波康发铸造有限公司 | Novel as-cast 500-7 nodular cast iron |
| CN104313232A (en) * | 2014-10-14 | 2015-01-28 | 株洲联诚集团有限责任公司 | Alloy gray cast iron material for locomotive brake disc, and casting method of alloy gray cast iron material |
| CN105401065A (en) * | 2015-11-28 | 2016-03-16 | 西峡县西泵特种铸造有限公司 | Production process of high-strength alloyed gray iron hydraulic valve body part |
| CN106011610A (en) * | 2016-07-29 | 2016-10-12 | 西峡县内燃机进排气管有限责任公司 | High-strength nodular cast iron QT900-6 and preparation method thereof |
| CN106048401A (en) * | 2016-08-15 | 2016-10-26 | 合肥江淮铸造有限责任公司 | Smelting and pouring process of gasoline engine cylinder body |
| CN106222533A (en) * | 2016-08-15 | 2016-12-14 | 合肥江淮铸造有限责任公司 | The pouring molten iron of a kind of diesel engine cylinder block and smelting technology |
Non-Patent Citations (1)
| Title |
|---|
| 国家建筑材料工业总局生产组: "《水泥工业技术革新经验汇编 第2辑》", 31 December 1978, 中国建筑工业出版社 * |
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Effective date of registration: 20220916 Granted publication date: 20210406 |