CN110527927A - It is a kind of to dredge retainer peculiar to vessel and its manufacturing method - Google Patents
It is a kind of to dredge retainer peculiar to vessel and its manufacturing method Download PDFInfo
- Publication number
- CN110527927A CN110527927A CN201910813330.5A CN201910813330A CN110527927A CN 110527927 A CN110527927 A CN 110527927A CN 201910813330 A CN201910813330 A CN 201910813330A CN 110527927 A CN110527927 A CN 110527927A
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- CN
- China
- Prior art keywords
- retainer
- manufacturing
- steel
- peculiar
- vessel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
- E02F3/8833—Floating installations
- E02F3/885—Floating installations self propelled, e.g. ship
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
- E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention belongs to ship's machinery field of material technology, and in particular to a kind of to dredge retainer peculiar to vessel and its manufacturing method.The retainer, chemical component is by mass percentage are as follows: C0.18~0.24%, Si0.30~0.60%, Mn0.80~1.20%, Cr0.50~1.30%, Ni0.70~0.80%, Mo0.50~0.90%, S < 0.025%, P < 0.10%, surplus are Fe and inevitable impurity；Its manufacturing method includes the following steps: (1) ingredient, (2) melting, (3) casting, (4) heat treatment, (5) machining.The present invention dredges retainer peculiar to vessel after final heat treatment, organizes not only to have good plasticity and toughness for the tempered sorbite of Dispersed precipitate globular carbide on lath-shaped ferrite, but also have both high hardness and wearability, be able to satisfy the requirement of high-performance dredger ship retainer；Its manufacturing method is simple and easy.
Description
Technical field
The invention belongs to ship's machinery field of material technology, and in particular to a kind of to dredge retainer peculiar to vessel and its manufacturing method.
Background technique
Dredger ship is domestic and international common dredger, is responsible for clear digging water channel and rivers and creeks mud, so that other ships smoothly lead to
It crosses.Dredger ship at work, needs that dredging pipe is fixed using retainer (Locking ring), due to most of time
It needs to carry out operation on the sea, it requires that retainer can resist the impact and corrosion of seawater, and buffer function can be played.
It is needed recently as market and the development of shipbuilding technology, dredger ship is constantly sent out to large-scale and ultra-large type direction
Exhibition, the volume of retainer peculiar to vessel also constantly increase, and this requires retainer materials higher intensity and toughness.It is existing quenched
Steel, such as ZG34Cr2Ni2Mo, performance parameter are as follows: yield strength >=700MPa, tensile strength >=950MPa, elongation after fracture >=
12%, hardness HB >=240；Existing common middle low carbon steel, such as 45 steel, performance parameter are as follows: yield strength >=310MPa stretches
Intensity >=570MPa, elongation after fracture >=15% (the newly organized metal material handbook of Xu Feng, Huang Yun, Anhui science tech publishing house,
2017).Quenched hardness of steel is enough and toughness is insufficient, and common middle low carbon steel toughness is enough and intensity is insufficient, and casting character is poor, casting
It needs annealed technique to eliminate casting stress after making and refines crystal grain.
Therefore, this field needs a kind of with higher-strength and toughness and the good dredger ship retainer steel of casting character.
Summary of the invention
In view of the deficiencies of the prior art, the object of the present invention is to provide a kind of dredging retainer peculiar to vessel, there is higher-strength, tough
Property, wearability, and casting character is good；It is scientific and reasonable present invention simultaneously provides its manufacturing method, it is simple and easy.
Dredging retainer peculiar to vessel of the present invention, chemical component is by mass percentage are as follows:
C0.18~0.24%, Si0.30~0.60%, Mn0.80~1.20%, Cr0.50~1.30%, Ni0.70~
0.80%, Mo0.50~0.90%, S < 0.025%, P < 0.10%, surplus are Fe and inevitable impurity.
Wherein:
The microstructure of the dredging retainer peculiar to vessel is the tempering of Dispersed precipitate globular carbide on lath columnar ferrite
Sorbite.
The manufacturing method of dredging retainer peculiar to vessel of the present invention, comprising the following steps:
(1) ingredient: alloy composition ingredient is pressed；
(2) melting: using middle frequency furnace to above-mentioned ingredient carry out melting, furnace charge is melting down, skim after, pour into steel ladle；
(3) cast: after pouring method addition inovulant in packet, casting obtains as cast condition retainer；
(4) it is heat-treated: the as cast condition retainer that casting obtains being heated to 600~650 DEG C of 1~2h of heat preservation, is further continued for being warming up to
860~920 DEG C, 2~4 hours are kept the temperature, is then cooled to room temperature；610~650 DEG C are heated to, keeps the temperature 2~4 hours, then water
It is as cold as room temperature；
(5) it machines: after machined, obtaining product.
Wherein:
In step (2), the smelting temperature is 1480~1510 DEG C.
Preferably, step (2) is specific as follows:
Melting is carried out to above-mentioned ingredient using middle frequency furnace, sets tapping temperature as 1480~1510 DEG C；After furnace charge dissolved clarification
It skims, detects raw water ingredient with spectrometer, testing result is underproof to be adjusted as required again；Detect qualified increasing middle frequency furnace
Power pours into steel ladle after furnace temperature rises to 1480~1510 DEG C.
In step (3), the inovulant is that grey cast-iron is considered to be worth doing and steel cuttings, the dosage of grey cast-iron bits are steel quality
1.2~1.7%, the dosage of steel cuttings is the 5~8% of steel quality.
The selection of chemical composition reason of material therefor of the present invention is explained further below as follows:
It dredges carbon content and the addition nickel element of retainer peculiar to vessel by reducing and guarantees that material has high plasticity and toughness and resistance to
Corrosion, addition silicon, manganese, chromium simultaneously cooperate heat-treatment processing process formation carbide dispersion-strengthened appropriate mutually higher to guarantee
Intensity and hardness, addition silicon, manganese, molybdenum element improve the castability of steel to reduce gas hole defect, improve the coagulability of cast steel
Energy.
Carbon containing (C) of cast steel, which is measured, to be increased, tensile strength (σb) and yield strength (σs) increase accordingly, elongation (δ) then under
Drop.Phosphorus content is more than after 0.3%, and the plasticity of cast steel further declines with the increase of carbon content, and intensity improves less, bends
It takes and intensity or even is also declined slightly, therefore, select mass fraction between 0.18~0.24% in steel of the present invention.
Silicon (Si) is necessary deoxidier, increases the silicon content in cast steel, can improve the deoxidation situation of molten steel and enhance
In addition its ability for resisting secondary oxidation in tapping and casting process increases so as to prevent steel-casting from gas hole defect occurs
The content of silicon can effectively improve the intensity and hardness of steel.But the content of silicon is higher, the plasticity and toughness of steel are poorer, because
This, selects mass fraction between 0.30~0.60% in steel of the present invention.
Manganese (Mn) is also necessary deoxidier in steel-making, and moreover, manganese can also play the role of removing class oxygen element,
Such as the element sulphur in steel.In addition, manganese is austenite former, the harden ability of steel can be significantly improved, increases the intensity of steel
And hardness, reduce the ductile-brittle transition temperature of steel.But therefore the excessively high toughness plasticity that can reduce steel of manganese amount selects in steel of the present invention
Mass fraction is between 0.80~1.20%.
Molybdenum (Mo) is remarkably improved the harden ability of steel, moreover it is possible to improve the mobility of cast steel, but molybdenum category precious metal, therefore select
Between 0.50-0.90%.
Chromium (Cr) is the main alloy element for improving steel hardenability and temper resistance.Moreover, chromium can also improve steel
Hardness strength and wearability, but will cause steel toughness and plasticity be deteriorated, therefore, selected in steel of the present invention mass fraction for
Between 0.50~1.30%.
Nickel (Ni) is the corrosion resistance for improving steel and the advantageous elements of obdurability, and content is too low to have little effect.But nickel belongs to
Precious metal should be used less as far as possible, therefore select mass fraction between 0.70~0.80% in steel of the present invention.
Sulphur (S), phosphorus (P) are used as impurity element, and mass fraction is controlled respectively in S < 0.025%, P < 0.10%.
The founding method of material therefor of the present invention is explained further below as follows:
Grey cast-iron bits provide external nucleus with steel cuttings for iron liquid, increase the core that iron liquid forms δ-Fe, keep crystal grain thin
It is small, it is evenly distributed, peritectic reaction occurs as iron liquid is cooling, δ-Fe is changed into austenite, continues to cool down, the tendency of growing up of crystal grain
Also more and more weaker, finally obtain the tiny pearlite matrix of crystal grain.Because the grey cast-iron bits amount of addition is less, through research graphite
It is influenced in the presence of the performance on steel of the present invention smaller.
The heat-treatment protocol of material therefor of the present invention is explained further below as follows:
The casting that casting obtains is heated to 600~650 DEG C of 1~2h of heat preservation, is to change non-equilibrium microstructure in steel
For statenchyma, while eliminating as-cast structure heredity and the pre-heat treatment as quenching technical.The purpose of quenching is to obtain entirely
The lath martensite in portion and a small amount of remaining carbide, improve the intensity, hardness and wearability of steel.Quenching temperature is not too low
To whole martensite, quenching temperature is excessively high to make coarse grains, also can waste of energy.The purpose of tempering is to eliminate quenching
Stress obtains the good tempered sorbite of comprehensive mechanical property.Tempering temperature is lower than 610 DEG C, and carbide is insufficient to allow to analyse completely
Out, and plasticity poor toughness, tempering temperature are higher than 650 DEG C, and the hardness of steel and wearability can be made to reduce.The type of cooling of tempering is selected
Being selected as water cooling is to eliminate temper brittleness.
Compared with prior art, the invention has the following advantages:
1, the present invention dredges retainer peculiar to vessel after final heat treatment, organizes as Dispersed precipitate Spherical Carbon on lath-shaped ferrite
The tempered sorbite of compound not only has good plasticity and toughness, but also has both high hardness and wearability, is able to satisfy high-performance dredger ship
The requirement of retainer.
2, the manufacturing method of the present invention, it is scientific and reasonable, it is simple and easy.
Detailed description of the invention
Fig. 1 is the metallographic structure figure of the auxiliary ingot bar of casting of the present invention.
Specific embodiment
Below with reference to embodiment, the present invention will be further described.
All raw materials used in embodiment are commercially available unless otherwise specified.
Table 1 lists the amount that the present invention dredges added inovulant in the chemical component and fusion process of retainer peculiar to vessel.It incite somebody to action this
It is cast into retainer after invention steel ingredient, melting, is machined after final heat treatment, the present invention is obtained and dredges retainer peculiar to vessel
Finished product.
Final Heat Treatment Process is shown in Table 2.The auxiliary ingot bar of retainer casting is cut as experimental material, does metallographic observation and mechanical property
It can test, test its yield strength, tensile strength, elongation after fracture and Brinell hardness, be listed in table 2.It can from the data of table 2
Out, the mechanical performance that the present invention dredges retainer peculiar to vessel will than the comprehensive performance of quenched and tempered steel used at present and ordinary low-carbon steel
It is good.
1 present invention of table dredges the chemical component and added incubation dose (mass percent) of retainer peculiar to vessel
2 present invention of table dredges the performance of retainer peculiar to vessel
Embodiment does not constitute the limit to the scope of the present invention only to facilitate understand technical solution of the present invention
System, anything that does not depart from the technical scheme of the invention or according to the technical essence of the invention on above scheme is done it is any
Simple modification, equivalent variations and modification, still fall within the scope of the present invention.
Claims (7)
1. a kind of dredging retainer peculiar to vessel, it is characterised in that: chemical component is by mass percentage are as follows:
C0.18~0.24%, Si0.30~0.60%, Mn0.80~1.20%, Cr0.50~1.30%, Ni0.70~
0.80%, Mo0.50~0.90%, S < 0.025%, P < 0.10%, surplus are Fe and inevitable impurity.
2. dredging retainer peculiar to vessel described in claim 1, it is characterised in that: the microstructure of the dredging retainer peculiar to vessel is plate
The tempered sorbite of Dispersed precipitate globular carbide on ferrite banding.
3. a kind of manufacturing method of dredging retainer peculiar to vessel of any of claims 1 or 2, it is characterised in that: the following steps are included:
(1) ingredient: alloy composition ingredient is pressed；
(2) melting: using middle frequency furnace to above-mentioned ingredient carry out melting, furnace charge is melting down, skim after, pour into steel ladle；
(3) cast: after pouring method addition inovulant in packet, casting obtains as cast condition retainer；
(4) it is heat-treated: the obtained as cast condition retainer of casting is heated to 600~650 DEG C of 1~2h of heat preservation, it is further continued for being warming up to 860~
920 DEG C, 2~4 hours are kept the temperature, is then cooled to room temperature；610~650 DEG C are heated to, keeps the temperature 2~4 hours, then water cooling arrives
Room temperature；
(5) it machines: after machined, obtaining product.
4. manufacturing method according to claim 3, it is characterised in that: in step (2), the smelting temperature be 1480~
1510℃。
5. manufacturing method according to claim 3, it is characterised in that: in step (3), the inovulant is grey cast-iron
Bits and steel cuttings.
6. manufacturing method according to claim 5, it is characterised in that: the dosage of the grey cast-iron bits is steel quality
1.2~1.7%.
7. manufacturing method according to claim 5, it is characterised in that: the dosage of the steel cuttings be steel quality 5~
8%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910813330.5A CN110527927A (en) | 2019-08-30 | 2019-08-30 | It is a kind of to dredge retainer peculiar to vessel and its manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910813330.5A CN110527927A (en) | 2019-08-30 | 2019-08-30 | It is a kind of to dredge retainer peculiar to vessel and its manufacturing method |
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| CN110527927A true CN110527927A (en) | 2019-12-03 |
Family
ID=68665434
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| CN201910813330.5A Pending CN110527927A (en) | 2019-08-30 | 2019-08-30 | It is a kind of to dredge retainer peculiar to vessel and its manufacturing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116921699A (en) * | 2023-07-31 | 2023-10-24 | 连云港华鼎车轮有限公司 | Manufacturing process of lock ring for wheel type engineering machinery wheel |
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Application publication date: 20191203 |
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