CN101851699B - Method for manufacturing carbide-free bainite low-temperature cast steel - Google Patents
Method for manufacturing carbide-free bainite low-temperature cast steel Download PDFInfo
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Abstract
The invention provides a method for manufacturing carbide-free bainite low-temperature cast steel. The cast steel is prepared by the steps of performing medium-temperature quenching and high-temperature tempering on the following materials in weight percentage: 0.03 to 0.05 percent of carbon, 0.1 to 0.5 percent of silicon, 0.4 to 0.6 percent of manganese, less than 0.03 percent of sulfur, less than 0.03 percent of phosphor, 5.0 to 6.0 percent of nickel, 0.1 to 0.2 percent of molybdenum and the balance of iron. In medium-temperature quenching, the rest austenite is completely converted into martensite without residual austenite, so that the bainite tissue with excellent comprehensive mechanical properties is obtained, and the reliability for the steel when being used at low temperature is fundamentally determined.
Description
Technical field
The present invention relates to the method for manufacture of Cryogenic Steel, in particular, the present invention relates to have the method for manufacture of the low-temperature cast steel of carbide-free Bainite.
Background technology
Both at home and abroad to low-temperature steel research more be stocking, study lessly to the casting material.Compare with the casting material with regard to stocking, under same chemical ingredients and heat treated condition, the performance of casting material is lower than stocking.The crystal grain of as cast condition steel is thicker, and its as-cast structure often occurs like casting flaws such as shrinkage cavity, shrinkage porosite, tiny cracks, and these factors all can make the mechanical property reduction of steel.This phenomenon not only exists at normal temperatures, the same existence under coldcondition.Be applied to many low temperature mechanical means of industrial sectors such as oil, chemical industry, metallurgy, have the parts of special shape, can only could prepare through Foundry Production like pump, valve, pipeline and container etc.Used casting low-temperature steel generally adopts Chromiumnickel Austenite Stainless Steel both at home and abroad.Such steel grade has good low-temperature toughness, but ys is low.Bainite with the tough and soft ferrite matrix of hard phase martensite strengthening has the excellent comprehensive performance, becomes the potential alternative steel grade of austenite low-temperature cast steel.Yet carbide in the bainitic steel and residual austenite can reduce the low-temperature performance of low-temperature steel greatly under the low-temperature working condition.
Huangyan; Black ancestral elder brother is in the 29th volume the 2nd phase Daliann Maritime University's journal (article numbering: delivered the paper of " non-carbide bainitic steel low-temperature flexibility " by name 1006-7736 (2003) 02-0075-03), wherein disclose a kind of residual austenite and carbide, obdurability overall target bainite structure preferably that do not have.Yet its method of manufacture but is not disclosed as know-how so far.
Summary of the invention
The present invention aims to provide the method for manufacture of the bainite low-temperature cast steel of the good comprehensive low temperature mechanical property of having of carbides-free and residual austenite.
Technical scheme of the present invention is following:
The method of manufacture of the carbide-free bainite low-temperature cast steel that the contriver provides is with the material with following compositions, and the mode of temperature quenching+high tempering is carried out the cast steel manufacturing in the employing,
Carbon 0.03%～0.05%
Silicon 0.1%～0.5%
Manganese 0.4%～0.6%
Sulphur is less than 0.03%
Phosphorus is less than 0.03%
Nickel 5.0%～6.0%
Molybdenum 0.1%～0.2%
Iron all the other
The above per-cent all is weight percentage;
Its gordian technique is:
1. warm quenching temperature is 850 ℃ in described, and medium is a water, 25 ℃～65 ℃ of water temperatures;
2. described high tempering temperature is 700 ℃.
Adopt the low-temperature cast steel of aforesaid method gained to see table 1 in the data of normal temperature and low temperature impact test,
Table 1 normal temperature and low-temperature impact toughness
| Temperature/℃ | Room temperature | -12 | -25 | -35 | -50 | -80 |
| Impact toughness/J | 10.60 | 10.48 | 10.15 | 9.36 | 7.35 | 5.66 |
Can be drawn by the test-results in the table 1, under the low-temperature working condition, the impact toughness of carbide-free bainite low-temperature cast steel is greater than the index of the impact toughness 2.07J of general in the world charpyV type notched impact specimen.In the time of-80 ℃, the impact toughness of carbide-free bainite low-temperature cast steel is greater than 2 times of the minimum requirements impact toughness.Be used for the steel of low temperature machinery, most important mechanical performance index is an impact toughness.The impact toughness of carbide-free bainite low-temperature cast steel is fit to be applied in the toughness index with steel of low temperature range more than-80 ℃.
Table 2 is the tension test data that adopt the low-temperature cast steel of aforesaid method gained,
Table 2 tensile property
| Tensile strength б b/MPa | Elongation δ/% | Relative reduction in area ψ/% |
| 750 | 17.4 | 63.8 |
Can know by the test-results in the table 2, this carbide-free bainite low-temperature cast steel at normal temperatures, its intensity index (б
b) reached the index (б of the highest casting carbon steel ZG55 of intensity
b>=650MPa), and its plasticity index (δ ψ) then reaches or near the index (δ of the best casting carbon steel ZG15 of plasticity
5>=25%, ψ>=40%).
In the foundry goods; Though the few stable residual austenite have an impact toughness that helps improve low-temperature cast steel; In case can under the worst cold case condition, change into martensite by this part residual austenite, near it, will produce tiny crack, these tiny cracks will reduce the impact toughness of steel greatly.Low-temperature cast steel X-ray diffraction analysis to adopting the aforesaid method gained can draw, and does not have residual austenite to exist in the carbide-free bainite low-temperature cast steel.Temperature was quenched during the thermal treatment process of carbide-free bainite low-temperature cast steel of the present invention adopted 850 ℃, and medium is a water, 25 ℃～65 ℃ of water temperatures; 700 ℃ of high temperings, and when alloy designs, be controlled at 0.03%～0.05% scope to the content of carbon, obtained the ideal tissue of no residual austenite after bakingout process.Fundamentally confirmed the safety that this steel grade uses at low temperatures.
Description of drawings
Fig. 1 is the microstructure of the carbide-free bainite low-temperature cast steel that makes of the method for the invention.
Wherein the secret note piece is a martensite, and the informal voucher piece is a ferritic, and this is typical bainite structure, does not find the existence of carbide.Bainite is a kind of more special microstructure.Carbide-free bainite low-temperature cast steel is crossed and is chilled to middle temperature area in heat treatment process, and this process can be to take place with the isothermal form, also can adopt continuous refrigerative mode.Can see that from the microstructure of carbide-free bainite low-temperature cast steel the bainite of carbide-free bainite low-temperature steel forms with diffusion way, has incoherent interface.The quench hot temperature has guaranteed carbon atom when spread coefficient is very big, from α mutually precipitation, spread to austenite through the austenitic phase interface of ferritic, formed by lath ferritic folder to change the martensite that forms by rich carbon austenitic.Austenite all is transformed into martensite, has guaranteed that fundamentally microstructure is stable when the low-temperature working state.
Embodiment
The method of manufacture of carbide-free bainite low-temperature cast steel is with the material with following compositions, and the mode of temperature quenching+high tempering is carried out the cast steel manufacturing in the employing,
Carbon 0.03%～0.05%
Silicon 0.1%～0.5%
Manganese 0.4%～0.6%
Sulphur is less than 0.03%
Phosphorus is less than 0.03%
Nickel 5.0%～6.0%
Molybdenum 0.1%～0.2%
Iron all the other
The above per-cent all is weight percentage; Warm quenching temperature is 850 ℃ in described, and medium is a water, 25 ℃～65 ℃ of water temperatures; Described high tempering temperature is 700 ℃.
Claims (1)
1. the method for manufacture of carbide-free bainite low-temperature cast steel is with the material with following compositions, and the mode of temperature quenching+high tempering is carried out the cast steel manufacturing in the employing,
Carbon 0.03%～0.05%
Silicon 0.1%～0.5%
Manganese 0.4%～0.6%
Sulphur is less than 0.03%
Phosphorus is less than 0.03%
Nickel 5.0%～6.0%
Molybdenum 0.1%～0.2%
Iron all the other
The above per-cent all is weight percentage;
It is characterized in that:
Warm quenching temperature is 850 ℃ in described, and medium is a water, 25 ℃～65 ℃ of water temperatures;
Described high tempering temperature is 700 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102030037A CN101851699B (en) | 2010-06-12 | 2010-06-12 | Method for manufacturing carbide-free bainite low-temperature cast steel |
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| CN2010102030037A CN101851699B (en) | 2010-06-12 | 2010-06-12 | Method for manufacturing carbide-free bainite low-temperature cast steel |
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| CN101851699A CN101851699A (en) | 2010-10-06 |
| CN101851699B true CN101851699B (en) | 2012-02-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100523262C (en) * | 2005-04-18 | 2009-08-05 | 河南省强力机械有限公司 | Meta-bainite steel and application of the same in railway |
| CN101338400B (en) * | 2008-08-18 | 2010-07-21 | 南京钢铁股份有限公司 | High strength low-temperature-used low carbon bainite steel and production process thereof |
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