CN109609836A - The production method and its cast product of as cast condition heavy section ductile iron - Google Patents
The production method and its cast product of as cast condition heavy section ductile iron Download PDFInfo
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- CN109609836A CN109609836A CN201811621574.5A CN201811621574A CN109609836A CN 109609836 A CN109609836 A CN 109609836A CN 201811621574 A CN201811621574 A CN 201811621574A CN 109609836 A CN109609836 A CN 109609836A
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- production method
- heavy section
- cast
- ductile iron
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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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
-
- 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
-
- 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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- 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 relates to a kind of production methods of as cast condition heavy section ductile iron, comprising the following steps: ingredient includes: Benxi pig iron Q10；Carbon steel scrap, sandwich spheroidising is used at 1500 ± 20 DEG C after preparing molten iron: rare-earth nodularizer, silicon titanate innoculant, coverture is added, the nodularization time is between 65-80 seconds, Oxygen potential is greater than 85%, rare earth inovulant, the chemical composition content of mould casting obtained are carbon: 3.00-3.20%；Silicon: 3.80-4.20%；Manganese: 0.20-0.30%；Phosphorus :≤0.05%；Sulphur: 0.006-0.02%；Tin :≤0.01%；Copper :≤0.15%；Chromium :≤0.05%.Tensile strength >=600Mpa of the invention, yield strength >=450 Mpa, elongation percentage >=12%, Oxygen potential >=85%, content of pearlite in alloy 2%-5%, no free carbide and iron phosphide eutectic.
Description
Technical field
The present invention relates to casting manufacture field, a kind of production method more particularly to as cast condition heavy section ductile iron and
Cast product obtained by this method.
Background technique
Spheroidal graphite cast-iron is a kind of 20th century high strength cast iron material for growing up of the fifties, comprehensive performance close to
Steel is based on its excellent performance, has been successfully used to cast some stress complexity, intensity, toughness, wearability are more demanding
Part.Spheroidal graphite cast-iron rapidly developed for be only second to gray cast iron, using very extensive cast iron materials.Spheroidal graphite cast-iron is logical
It crosses nodularization and inoculation obtains globular graphite, effectively improve the mechanical performance of cast iron, in particular improve plasticity and tough
Property, to obtain the intensity also higher than carbon steel.
The spheroidal graphite cast-iron that the trade mark is QT600-10 elongation with higher while having compared with high-tensile.At present
Without being directed to QT600-10 in national standard.Domestic manufacturer is required to be overheated place for heavy section ductile iron QT600-10 at present
Science and engineering skill can be only achieved tensile strength >=600, yield strength >=370, the requirement of elongation percentage >=10.And being heat-treated is in solid-state
Under, it is gold to obtain a kind of metal heat processing technique of intended tissue and performance by the means of heating, heat preservation and cooling
Belong to step essential in processing technology.
Summary of the invention
It is an object of the present invention to provide a kind of production method of as cast condition heavy section ductile iron, especially a kind of casting
State thick and large section high-strength high-elongation ratio spheroidal graphite cast-iron QT600-10 production method.
In order to achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of production method of as cast condition heavy section ductile iron, comprising the following steps:
(1), ingredient includes:
The pig iron: Benxi pig iron Q10；
Steel scrap: carbon steel scrap, in which: manganese≤0.4%,
(2), spheroidising: sandwich spheroidising is used at 1500 ± 20 DEG C after preparing molten iron: rare-earth nodularizer is added
1.2-1.4%, silicon titanate innoculant 0.6-0.8%, coverture 1.0-1.2%, nodularization time are between 65-80 seconds, and Oxygen potential is greater than
85%,
(3), be poured: using the current-following inoculation of 0.2-0.4% rare earth inovulant, first case pouring temperature is 1390-1380 DEG C, is lower than
Every case thermometric is needed at 1380 DEG C, last box temperature degree is not less than 1350 DEG C,
(4), the chemical composition content of mould casting: carbon: 3.00-3.20%；Silicon: 3.80-4.20%；Manganese: 0.20-0.30%；Phosphorus:
≤0.05%；Sulphur: 0.006-0.02%；Tin :≤0.01%；Copper :≤0.15%；Chromium :≤0.05%.
Preferably, in which: nodulizer: granularity 5-20mm, siliceous 44-46%；0.50-0.60% containing rare earth；Content of magnesium 5-
7%；Calcic 0.5-1.5%；0.70-0.80% containing aluminium；
Silicon titanate innoculant: agent granularity is 1-3mm, siliceous 70-75%, baric 1-3%；
Rare earth inovulant: random inoculant granularity is 0.2-0.6mm, siliceous 70-75%；Baric 2.0-2.5%；Calcic 1.50-
1.60%；1.2-1.6% containing aluminium；1.3-1.7% containing rare earth；
Coverture: silicon steel sheet；
It is poured molding sand: granularity 57-63.
Preferably, a chemical component detection is carried out before molten iron discharging reaches claimed below:
Carbon: 3.10-3.30%；Silicon: 2.80-3.0%；Manganese: 0.20-0.30%；Phosphorus :≤0.05%；Sulphur: 0.006-0.02%；Tin :≤
0.01%；Copper :≤0.15%；Chromium :≤0.05%.
It is further preferred that selection carburant adjusts carbon content, carburant: low-sulfur carburant, sulfur content≤0.05%, N gas
Body content≤300ppm.
Preferably, the boot for being poured every packet makes quick metallographic test block and spectrum test block, and detection Oxygen potential is not less than 90%.
Preferably, offline after 2 hours after the completion of casting pouring, detect to casting ontology, testing requirements: Oxygen potential is not
Lower than 85%, content of pearlite in alloy is not higher than 5%, no free carbide and iron phosphide eutectic.
Preferably, offline after casting pouring 2 hours, ball blast is carried out, every furnace removes boot detection casting after completing ball blast
Mechanical performance and metallographic performance.
Preferably, be added foundry returns in ingredient, foundry returns, steel scrap ratio be 6:4.
Preferably, this method does not include heat treatment process.
It is a further object to provide casting made from a kind of production method of as cast condition heavy section ductile iron
Product.
In order to achieve the above objectives, the technical solution adopted by the present invention is that:
Cast product made from a kind of production method of as cast condition heavy section ductile iron, the chemical component of the cast product
Are as follows: carbon: 3.00-3.20%；Silicon: 3.80-4.20%；Manganese: 0.20-0.30%；Phosphorus :≤0.05%；Sulphur: 0.006-0.02%；Tin :≤
0.01%；Copper :≤0.15%；Chromium :≤0.05%；Remaining is iron.
Preferably, the cast product is engineering machinery hub cast.
Present invention principle:
Oxygen potential: guaranteeing > 85%, and control method: using granularity for the low rare-earth nodularizer of 5-20mm, reduces the seam between particle
Gap is clogged using the silicon titanate innoculant that granularity is 1-3mm, is made the more consolidation of entire nodularization room filling, is then covered with silicon steel sheet
Agent covering, nodulizer layering detonation nodularization, extends the nodularization time when just reaching nodularization, improves nodularization efficiency；It is oriented using funnel
Feed way controls the nodularization of every packet and is in stable state；Using quick metallographic test block, attached body test block, spheroidizing reacion meter
When three layers of device check on.
Yield strength: 370Mpa.
Tensile strength: 600Mpa；Control means: control essential element forms the metallographic matrix based on ferrite, utilizes silicon
Solution strengthening effect improves tensile strength and yield strength, reduces control range, so that tensile yield strength control is more smart
Really, tensile strength control errors are in 30Mpa, and yield strength control errors are in 15Mpa；Silicone content is improved, the solid solution for enhancing silicon is strong
Change effect.In actual production, accomplish 620 ± 15 Mpa of tensile strength, 500 ± 10 Mpa of yield strength.
Without free carbide content and iron phosphide eutectic, elongation percentage 10%；Control means: 85% or more Oxygen potential of control, silicone content
3.80-4.10%, low alloying are bred using 3 times, are increased graphite nucleus number and are refined graphite, while cooperating chill at thick big thermal center
Accelerating solidification refinement crystal grain prevents chunky graphite from generating, and keeps the inside of product finer and close, graphite form is more complete, effectively
Improve Oxygen potential and elongation percentage, according to said method controlled, practical elongation control is in 15-20%.
Must not have Shrinkage cavity defect: control means: low-shrinkage pine tendency: the design of consecutive solidification pouring technology improves technique
Adjustment casting temperature difference and feeding capacity, prevent the generation of Shrinkage cavity, reduce the security risk of product；Increase in suitable position
Add using high fever insulated feeder, provide enough liquid contraction amounts for casting, guarantees that cast-internal is closely knit.
Since above-mentioned technical proposal is used, the present invention has following advantages and effect compared with prior art:
In the present invention: tensile strength >=600Mpa, yield strength >=450 Mpa, elongation percentage >=12%, Oxygen potential >=85%, pearly-lustre
Body content 2%-5%, no free carbide content and iron phosphide eutectic.
Detailed description of the invention
Attached drawing 1 is the product schematic diagram of the present embodiment.
Specific embodiment
With reference to the accompanying drawing and case study on implementation the invention will be further described:
Engineering machinery hub cast as shown in Figure 1 is processed, wherein a:273mm, b:95mm, c, 74mm, d:540mm.It is for c
Sample position.The following steps are included:
Prepare ingredient:
The pig iron: Benxi pig iron Q10；
Steel scrap, foundry returns, steel scrap: carbon steel scrap, in which: manganese≤0.4%, foundry returns, steel scrap ratio be 6:4；
Nodulizer: French ferroalloy ZM-N5701 nodulizer, granularity 5-20mm, siliceous 45%；Containing rare earth 0.55%；Content of magnesium
6%；Calcic 1.0%；Containing aluminium 0.75%；
Inovulant: spheroidising inovulant uses silicon titanate innoculant, and granularity 1-3mm, random inoculant is using French ferroalloy
65260 random inoculants, granularity 0.2-0.6mm, siliceous 72%；Baric 2.3%；Calcic 1.53%；Containing aluminium 1.4%；Containing rare earth
1.5%；
Coverture: silicon steel sheet；
Carburant: low-sulfur carburant, sulfur content≤0.05%, N gas content≤300ppm；
It is poured molding sand: granularity 57-63.
A chemical component detection is carried out before molten iron discharging and reaches claimed below, in which: the detection of carbon sulphur uses German Brooker
Carbon sulphur instrument, other composition detections are using German Brooker spectrometer:
Carbon: 3.10-3.30%；Silicon: 2.80-3.0%；Manganese: 0.20-0.30%；Phosphorus :≤0.05%；Sulphur: 0.006-0.02%；Tin :≤
0.01%；Copper :≤0.15%；Chromium :≤0.05%.
Sandwich spheroidising is used at 1500 ± 20 DEG C after preparing molten iron: rare-earth nodularizer 1.3%, silicon barium is added
Inovulant 0.7%, coverture 1.1% are added when charging using charging hopper orientation, when using digital display timer, the nodularization time
Between 65-80 seconds, Oxygen potential is greater than 85%, is assessed as nodularization qualification, can be poured.
Using the current-following inoculation of 0.3% rare earth random inoculant when casting, first case pouring temperature is 1390-1380 DEG C, is lower than
Every case thermometric is needed at 1380 DEG C, last box temperature degree is not less than 1350 DEG C, and the boot of every packet makes quick metallographic test block and spectrum examination
Block, and detected by metallographic microscope, Oxygen potential is not less than 90%, and the chemical component of hub cast should control:
Carbon: 3.00-3.20%；Silicon: 3.80-4.20%；Manganese: 0.20-0.30%；Phosphorus :≤0.05%；Sulphur: 0.006-0.02%；Tin :≤
0.01%；Copper :≤0.15%；Chromium :≤0.05%.
If not meeting mentioned component range, need to be isolated, and detect bulk properties and metallographic.
It is offline after 2 hours after product casting complete, hub cast is detected, test lug testing requirements: Oxygen potential
Not less than 85%, content of pearlite in alloy is not higher than 5%.
Shot Blasting is carried out after offline immediately, every furnace removes the mechanical performance and gold of boot detection body after the completion of ball blast
Phase, mechanical performance detection are detected by 10T tensile testing machine, metallographic by metallographic microscope.
Through detecting: tensile strength >=600Mpa, yield strength >=450Mpa, elongation percentage >=12%, Oxygen potential >=85%, pearly-lustre
Body content 2%-5%, no free carbide content and iron phosphide eutectic.
Any position must not have shrinkage porosite, shrinkage cavity defect.If one of them are not able to satisfy above-mentioned requirements, which is reported
Useless processing.
Cleaning polishing: feather is not more than 1.0mm, and dead head remnants are not higher than 1.0mm.
Appearance detection: without obvious shortcomings such as sand holes, stomata, crackles.
Audio detection: it is detected by audio detector, it is desirable that >=3560, processing is scrapped if being unsatisfactory for.
After above-mentioned work is fully completed and is qualified, then delivery of casing.
And to production method conventional than in the prior art, and pass through heat treatment process, through detecting: tensile strength >=
600, yield strength >=370, elongation percentage >=10.It is obvious that processing step is not only omitted in the application, but also obtain better product
Performance.
Percentage in the application is mass percent in the case where no especially dated.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of production method of as cast condition heavy section ductile iron, it is characterised in that: the following steps are included:
(1), ingredient includes:
The pig iron: Benxi pig iron Q10；
Steel scrap: carbon steel scrap, in which: manganese≤0.4%,
(2), spheroidising: sandwich spheroidising is used at 1500 ± 20 DEG C after preparing molten iron: low rare earth nodularization is added
Agent 1.2-1.4%, silicon titanate innoculant 0.6-0.8%, coverture 1.0-1.2%, nodularization time are between 65-80 seconds, and Oxygen potential is greater than
85%,
(3), be poured: using the current-following inoculation of 0.2-0.4% rare earth inovulant, first case pouring temperature is 1390-1380 DEG C, is lower than
Every case thermometric is needed at 1380 DEG C, last box temperature degree is not less than 1350 DEG C,
(4), the chemical composition content of mould casting: carbon: 3.00-3.20%；Silicon: 3.80-4.20%；Manganese: 0.20-0.30%；Phosphorus:
≤0.05%；Sulphur: 0.006-0.02%；Tin :≤0.01%；Copper :≤0.15%；Chromium :≤0.05%.
2. the production method of as cast condition heavy section ductile iron according to claim 1, it is characterised in that: wherein:
Rare-earth nodularizer: granularity 5-20mm, siliceous 44-46%；0.50-0.60% containing rare earth；Content of magnesium 5-7%；Calcic 0.5-
1.5%；0.70-0.80% containing aluminium；
Silicon titanate innoculant: agent granularity is 1-3mm, siliceous 70-75%, baric 1-3%；
Rare earth inovulant: random inoculant granularity is 0.2-0.6mm, siliceous 70-75%；Baric 2.0-2.5%；Calcic 1.50-
1.60%；1.2-1.6% containing aluminium；1.3-1.7% containing rare earth；
Coverture: silicon steel sheet；
It is poured molding sand: granularity 57-63.
3. the production method of as cast condition heavy section ductile iron according to claim 1, it is characterised in that: molten iron discharging advances
Chemical component detection of row reaches claimed below:
Carbon: 3.10-3.30%；Silicon: 2.80-3.0%；Manganese: 0.20-0.30%；Phosphorus :≤0.05%；Sulphur: 0.006-0.02%；Tin :≤
0.01%；Copper :≤0.15%；Chromium :≤0.05%.
4. the production method of as cast condition heavy section ductile iron according to claim 3, it is characterised in that: selection carburant
Adjust carbon content, carburant: low-sulfur carburant, sulfur content≤0.05%, N gas content≤300ppm.
5. the production method of as cast condition heavy section ductile iron according to claim 1, it is characterised in that: be poured every packet
Boot makes quick metallographic test block and spectrum test block, and detection Oxygen potential is not less than 90%.
6. the production method of as cast condition heavy section ductile iron according to claim 1, it is characterised in that: casting pouring is complete
At offline after latter 2 hours, detect to casting ontology, testing requirements: Oxygen potential is not less than 85%, and content of pearlite in alloy is not higher than
5%,.
7. the production method of as cast condition heavy section ductile iron according to claim 1 or 6, it is characterised in that: casting pours
It is offline after note 2 hours, ball blast is carried out, every furnace removes mechanical performance and metallographic performance that boot detects casting after completing ball blast.
8. the production method of as cast condition heavy section ductile iron according to claim 1, it is characterised in that: be added in ingredient
Foundry returns, foundry returns, steel scrap ratio be 6:4.
9. being cast made from a kind of production method of the as cast condition heavy section ductile iron as described in above-mentioned any one claim
Part product, it is characterised in that: the chemical component of the product are as follows:
Carbon: 3.00-3.20%；Silicon: 3.80-4.20%；Manganese: 0.20-0.30%；Phosphorus :≤0.05%；Sulphur: 0.006-0.02%；Tin :≤
0.01%；Copper :≤0.15%；Chromium :≤0.05%；Remaining is iron.
10. cast product according to claim 9, it is characterised in that: the cast product is the casting of engineering machinery wheel hub
Part.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811621574.5A CN109609836B (en) | 2018-12-28 | 2018-12-28 | Production method of as-cast thick large-section nodular cast iron and cast product thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811621574.5A CN109609836B (en) | 2018-12-28 | 2018-12-28 | Production method of as-cast thick large-section nodular cast iron and cast product thereof |
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| CN109609836A true CN109609836A (en) | 2019-04-12 |
| CN109609836B CN109609836B (en) | 2020-12-08 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111197115A (en) * | 2020-01-10 | 2020-05-26 | 芜湖久弘重工股份有限公司 | Spheroidizing method suitable for thick and large-section nodular iron castings |
| CN112662937A (en) * | 2020-12-07 | 2021-04-16 | 安徽省隆兴铸造有限公司 | High-tensile-strength nodular cast iron and valve preparation method thereof |
| CN113174527A (en) * | 2021-04-28 | 2021-07-27 | 山东湖西王集团铸业有限公司 | Method for producing nodular cast iron by casting green sand |
| CN114381649A (en) * | 2022-01-13 | 2022-04-22 | 东风商用车有限公司 | High-strength high-toughness nodular cast iron material and casting method thereof |
| CN115725890A (en) * | 2022-11-25 | 2023-03-03 | 韶关金宝铸造有限公司 | High-strength and high-toughness automobile caliper and production method thereof |
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| CN105063467A (en) * | 2015-07-17 | 2015-11-18 | 江苏吉鑫风能科技股份有限公司 | Method of controlling graphite shape of core of large-cross-section silicon solid solution strengthening ferritic nodular cast iron |
| EP3239307A1 (en) * | 2016-04-29 | 2017-11-01 | General Electric Company | A ductile iron and process of forming a ductile iron component |
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2018
- 2018-12-28 CN CN201811621574.5A patent/CN109609836B/en not_active Expired - Fee Related
Patent Citations (2)
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| CN105063467A (en) * | 2015-07-17 | 2015-11-18 | 江苏吉鑫风能科技股份有限公司 | Method of controlling graphite shape of core of large-cross-section silicon solid solution strengthening ferritic nodular cast iron |
| EP3239307A1 (en) * | 2016-04-29 | 2017-11-01 | General Electric Company | A ductile iron and process of forming a ductile iron component |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111197115A (en) * | 2020-01-10 | 2020-05-26 | 芜湖久弘重工股份有限公司 | Spheroidizing method suitable for thick and large-section nodular iron castings |
| CN112662937A (en) * | 2020-12-07 | 2021-04-16 | 安徽省隆兴铸造有限公司 | High-tensile-strength nodular cast iron and valve preparation method thereof |
| CN113174527A (en) * | 2021-04-28 | 2021-07-27 | 山东湖西王集团铸业有限公司 | Method for producing nodular cast iron by casting green sand |
| CN114381649A (en) * | 2022-01-13 | 2022-04-22 | 东风商用车有限公司 | High-strength high-toughness nodular cast iron material and casting method thereof |
| CN115725890A (en) * | 2022-11-25 | 2023-03-03 | 韶关金宝铸造有限公司 | High-strength and high-toughness automobile caliper and production method thereof |
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|---|---|
| CN109609836B (en) | 2020-12-08 |
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