CN106282759A - A kind of low chromium alloy iron casting and preparation method thereof - Google Patents
A kind of low chromium alloy iron casting and preparation method thereof Download PDFInfo
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- CN106282759A CN106282759A CN201610850242.9A CN201610850242A CN106282759A CN 106282759 A CN106282759 A CN 106282759A CN 201610850242 A CN201610850242 A CN 201610850242A CN 106282759 A CN106282759 A CN 106282759A
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- chromium alloy
- low chromium
- alloy iron
- iron casting
- steel
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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
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
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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
- C22C37/06—Cast-iron alloys containing chromium
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- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention relates to low chrome technical field, especially a kind of low chromium alloy iron casting and preparation method thereof, by using with steel scrap as raw material, carburant is added in fusion process, control ferrum liquid chemical composition, carry out before steel tapping casting breeding, spheroidising and control pouring temperature, make the mechanical performances such as the toughness of the product of acquisition, hardness, metallographic structure more excellent, and reduce the preparation cost of low chromium alloy iron casting.
Description
Technical field
The present invention relates to low chrome technical field, especially a kind of low chromium alloy iron casting and preparation method thereof.
Background technology
Chrome alloy cast iron is a kind of abrasive media being widely used in the powder technologies such as cement, thermoelectricity, magnetic powder, ore dressing, for
Improve the hardness of chrome alloy cast iron, toughness, the comprehensive mechanical performance such as anti-corrosion, reduce consumption in use, each manufacturing enterprise
And R&D institution all explores in not section and research and develop new technology, therefore selecting suitable Technology for Heating Processing is to improve chrome alloy cast iron
Key.
At present, the chromium alloy cast iron produced both at home and abroad is divided into three kinds: high-chromium alloy cast-iron, middle chrome alloy cast iron, low chromium
Alloy cast iron.But, either high-chromium alloy cast-iron, middle chrome alloy cast iron or low chromium alloy iron casting, it is in smelting process,
It is the most all that to use the pig iron and steel scrap be raw material, through medium-frequency induction furnace melting, after reaching tapping temperature, carries out stokehold pregnant
Educate and spheroidising, then pour into a mould.This not only makes cost of material higher, and in smelting technology of the prior art, heat
Treatment temperature and time control incorrect, cause the inferior quality of the product obtained, as low in hardness, impact flexibility is poor, wear-resistant
Damage poor-performing.
Summary of the invention
In order to solve above-mentioned technical problem present in prior art, the present invention provides a kind of low chromium alloy iron casting and system thereof
Preparation Method.
It is achieved particular by techniques below scheme:
A kind of low chromium alloy iron casting preparation method, employing steel scrap is raw material, and adds carburant melting and be prepared as molten iron, and
And when controlling before pouring, the chemical composition of molten iron is C:2.6～3.2%, Si:0.8～1.2%, Mn by percentage to the quality
≤ 0.6%, S≤0.1%, P≤0.1%, Cr:2.0～2.5%, surplus is ferrum and inevitable impurity；Again by molten iron temperature
Being adjusted to 1500 DEG C, process breeds, spheroidising, cast, then is formed by its heat treatment.
Described carburant is C ＞ 98%, S≤0.05%, the high-quality carburant of granularity 0.2～1mm.
Described steel scrap is a kind of in A3 steel or 45# steel or the mixture of both any mass ratioes mixing.
Described spheroidising, adds nodulizer, and addition is the 0.05-0.08% of molten steel quality.
Described nodulizer is rare earth Mg-Si nodularizer.
Described heat treatment is at 650 DEG C after insulation 4h, then it is cold to carry out stove.
The addition of described method, steel scrap and carburant is divided into four times and adds, and carburant adds each time all at steel scrap
After addition.Impurity is reduced, it is to avoid carburant swims in molten steel surface, it is achieved absorption to carburant, the most right
The fineness of the granularity of carburant controls, and effectively makes carburant quickly to incorporate in molten iron, improves the quality of molten iron.
Described inoculation, after inovulant adds, after insulation 3-5min, steel tapping casting.
Above-mentioned low chromium alloy iron casting, when 20 DEG C, shock proof ballistic work is 2J, and metal Rockwell hardness is 48-
49HRC。
Compared with prior art, the technique effect of the present invention is embodied in:
It is raw material by using steel scrap, after carburant addition processes, before controlling the chemical composition before cast and breeding
Temperature so that the mechanical performances such as the toughness of the product of acquisition, hardness, metallographic structure are more excellent, and reduce low chromium
The preparation cost of alloy cast iron.
Especially by processing procedure, using the constant temp. heating of 650 DEG C to process 4h, carrying out, stove is cold, it is possible to effective
Strengthen toughness, hardness, improve metallographic structure.
The impact work of the product of the invention, is 2J when 20 DEG C.
The raw material used in the invention is full steel scrap, reduces cost prepared by tradition low chromium alloy iron casting.
Accompanying drawing explanation
Fig. 1 is comparative example metallographic structure.
Fig. 2 is test row metallographic structure.
Detailed description of the invention
Below in conjunction with specific embodiment, technical scheme is further limited, but claimed
Scope is not only limited to description.
Other steps not referred in the invention are all with reference to chrome alloy cast iron of the prior art, cast ball or casting
The preparation technology of forging, if Patent No. 201110425255.9, number of patent application are 200910144298.2 or number of patent application
For the cycle and taking corresponding operation in the technical scheme of 200410041736.X.
Embodiment 1
Steel scrap is added in the medium-frequency induction furnace of 1t capacity, and be added thereto to carburant and be smelted into molten iron, carburant
During with the addition of steel scrap for controlling before cast, the chemical composition in molten iron be by percentage to the quality C:2.6～3.2%,
Si:0.8～1.2%, Mn≤0.6%, S≤0.1%, P≤0.1%, Cr:2.0～2.5%, surplus is that ferrum is with inevitable
Impurity；Molten iron temperature is adjusted to 1500 DEG C, and process breeds, spheroidising, cast, then is formed by its heat treatment.Above-mentioned increasing
Carbon agent uses C ＞ 98%, S≤0.05%, the Delanium of granularity 0.2～1mm.Heat treatment is insulation 4h at 650 DEG C
After, then carry out that stove is cold or air cooling is to room temperature.Above-mentioned inoculation, hot metal composition is qualified, reach tapping temperature after add and breed
Agent, steel tapping casting after insulation 3-5min.Above-mentioned spheroidising, adds nodulizer, with pouring method in tapping process in casting ladle
Carry out spheroidising (addition is the 0.05-0.08% of molten steel quality), pour into a mould after spheroidising.Described nodulizer is dilute
Soil mg-si master alloy.
Embodiment 2
On the basis of embodiment 1, what steel scrap selected is A3 steel, and the corrosion situation of this steel is the slightest.At other
In embodiment, steel scrap can also select the mixture of 45# steel or 45# steel and any mass ratio of A3 steel.
Embodiment 3
On the basis of embodiment 1, the addition order of steel scrap and carburant is steel scrap, carburant, steel scrap, carburant, gives up
Steel, carburant, steel scrap, carburant, foundry returns, silicomangan, then after being incubated 3-5min, steel tapping casting.
Test row:
Comparative example: using steel scrap and the pig iron is raw material, and after carrying out mixed smelting according to steel scrap and the pig iron, according to the present invention
Embodiment 1 preparation method created processes, and uses cooling heat treatment, it is thus achieved that product.Sample specification is 10mm 10mm
╳55mm。
Test is classified as the product that embodiment 1 obtains.Sample specification is 10mm 10mm 55mm.
Comparative example and test row sample are carried out at Shoudu Iron and Steel Co Kweiyang special iron and steel Co., Ltd steel research
Ballistic work, hardness, metallographic structure detection test, its result is as follows:
1, ballistic work uses non-notch impact, and testing equipment is JB300-B shock machine, impact test at 20 DEG C,
Result is as shown in table 1:
Table 1
| Sample | Test row | Reference examples |
| Ballistic work | 2J | 2J |
Being shown shock treatment under ballistic work is 2J by table 1 data, there are no any breach phenomenon, its toughness is more excellent,
Can compare favourably with the product that the pig iron is raw material with traditional steel scrap.
2, hardness test is according to GB/T230 metallic rockwell hardness test method, and testing equipment is HR-150A, at 20 DEG C
Lower test, result of the test is as shown in table 2: sample is respectively comparative example and each 3 of test row.
Table 2
Being shown by table 2 data, the Rockwell hardness of the product of the invention is more excellent than the Rockwell hardness of comparative example.
3, metallographic structure test: test method is according to GB/T13299, and experimental facilities is that AXiovert100A Zeiss metallographic shows
Micro mirror, its result of the test, such as the contrast of Fig. 1 and Fig. 2.
By the contrast of Fig. 1 and Fig. 2, both are pearlite eutectic Lai Shi tissue.
On ancestor, result of the test can draw, it is each that the preparation method of the low chromium alloy iron casting of the invention enables to product
It is the product of raw material that item comprehensive mechanical performance is better than using the pig iron and steel scrap, and its impact flexibility can be with the pig iron and steel scrap product phase
Matching in excellence or beauty, its hardness is far longer than the pig iron and steel scrap is the product of raw material production, and from the point of view of metallographic structure, the invention is also
More excellent.
Claims (10)
1. a low chromium alloy iron casting preparation method, it is characterised in that employing steel scrap is raw material, and add carburant melting and prepare
Become molten iron, and when controlling before pouring, the chemical composition of molten iron be by percentage to the quality C:2.6～3.2%, Si:0.8～
1.2%, Mn≤0.6%, S≤0.1%, P≤0.1%, Cr:2.0～2.5%, surplus is ferrum and inevitable impurity；Again will
Molten iron temperature is adjusted to 1500 DEG C, and process breeds, spheroidising, cast, then is formed by its heat treatment.
2. low chromium alloy iron casting preparation method as claimed in claim 1, it is characterised in that described carburant be C ＞ 98%,
S≤0.05%, the Delanium of granularity 0.2～1mm.
3. low chromium alloy iron casting preparation method as claimed in claim 1, it is characterised in that described steel scrap is A3 steel or 45#
A kind of in steel or the mixture of both any mass ratioes mixing.
4. low chromium alloy iron casting preparation method as claimed in claim 1, it is characterised in that described spheroidising, in tapping
During add nodulizer, addition is the 0.05-0.08% of molten steel quality.
5. low chromium alloy iron casting preparation method as claimed in claim 4, it is characterised in that described nodulizer is rare earth Mg-Si
Nodulizer.
6. low chromium alloy iron casting preparation method as claimed in claim 1, it is characterised in that described heat treatment is at 650 DEG C
After lower insulation 4h, then it is cold to carry out stove.
7. low chromium alloy iron casting preparation method as claimed in claim 1, it is characterised in that described method, steel scrap and carburetting
The addition of agent is divided into four times and adds, and carburant adds each time all after steel scrap adds.
8. the low chromium alloy iron casting preparation method as described in claim 1 or 4, it is characterised in that described inoculation, pregnant
After educating agent addition, after insulation 3-5min, steel tapping casting.
9. the low chromium alloy iron casting that prepared by the method as described in any one of claim 1-8.
10. low chromium alloy iron casting as claimed in claim 9, it is characterised in that when 20 DEG C, shock proof ballistic work is 2J,
Metal Rockwell hardness is 48-49HRC.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610850242.9A CN106282759A (en) | 2016-09-26 | 2016-09-26 | A kind of low chromium alloy iron casting and preparation method thereof |
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| CN201610850242.9A CN106282759A (en) | 2016-09-26 | 2016-09-26 | A kind of low chromium alloy iron casting and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107604240A (en) * | 2017-11-07 | 2018-01-19 | 德清雄峰铸造有限公司 | Alloy cast iron |
| CN110016606A (en) * | 2019-05-17 | 2019-07-16 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of high-strength cast iron part |
| CN110117688A (en) * | 2019-05-17 | 2019-08-13 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of high-strength abrasion-proof idler wheel casting |
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|---|---|---|---|---|
| JPH0841581A (en) * | 1994-08-02 | 1996-02-13 | Fukushima Seiko Kk | Spheroidal graphite cast iron and its production |
| CN101445889A (en) * | 2008-12-26 | 2009-06-03 | 马鞍山市益丰实业集团有限公司 | High abrasion proof re-synthesizing cast iron grinding ball and production method thereof |
| CN101445853A (en) * | 2007-11-28 | 2009-06-03 | 上海华新合金有限公司 | Method for casting elevator as-cast ball iron towing pulley |
| CN101463450A (en) * | 2008-12-26 | 2009-06-24 | 马鞍山市益丰实业集团有限公司 | Multicomponent microalloy metal mold casting grinding ball and production method thereof |
| CN101629269A (en) * | 2009-07-30 | 2010-01-20 | 宁国市开源电力耐磨材料有限公司 | Smelting process of low chromium ball |
| CN101892341A (en) * | 2010-06-12 | 2010-11-24 | 无锡永新特种金属有限公司 | Ductile iron rare earth Mg-Si nodularizer |
| CN104120332A (en) * | 2014-07-31 | 2014-10-29 | 大连金州茂隆实业有限公司 | High-strength high-toughness ductile cast iron 600-10 and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0841581A (en) * | 1994-08-02 | 1996-02-13 | Fukushima Seiko Kk | Spheroidal graphite cast iron and its production |
| CN101445853A (en) * | 2007-11-28 | 2009-06-03 | 上海华新合金有限公司 | Method for casting elevator as-cast ball iron towing pulley |
| CN101445889A (en) * | 2008-12-26 | 2009-06-03 | 马鞍山市益丰实业集团有限公司 | High abrasion proof re-synthesizing cast iron grinding ball and production method thereof |
| CN101463450A (en) * | 2008-12-26 | 2009-06-24 | 马鞍山市益丰实业集团有限公司 | Multicomponent microalloy metal mold casting grinding ball and production method thereof |
| CN101629269A (en) * | 2009-07-30 | 2010-01-20 | 宁国市开源电力耐磨材料有限公司 | Smelting process of low chromium ball |
| CN101892341A (en) * | 2010-06-12 | 2010-11-24 | 无锡永新特种金属有限公司 | Ductile iron rare earth Mg-Si nodularizer |
| CN104120332A (en) * | 2014-07-31 | 2014-10-29 | 大连金州茂隆实业有限公司 | High-strength high-toughness ductile cast iron 600-10 and production method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107604240A (en) * | 2017-11-07 | 2018-01-19 | 德清雄峰铸造有限公司 | Alloy cast iron |
| CN110016606A (en) * | 2019-05-17 | 2019-07-16 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of high-strength cast iron part |
| CN110117688A (en) * | 2019-05-17 | 2019-08-13 | 重庆银河铸锻有限责任公司 | A kind of electro-smelting method of high-strength abrasion-proof idler wheel casting |
| CN110016606B (en) * | 2019-05-17 | 2022-01-25 | 重庆机床(集团)有限责任公司 | Electric furnace smelting method for high-strength iron castings |
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