CN103667976A - Ferrite heat resistant steel - Google Patents
Ferrite heat resistant steel Download PDFInfo
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- CN103667976A CN103667976A CN201210327620.7A CN201210327620A CN103667976A CN 103667976 A CN103667976 A CN 103667976A CN 201210327620 A CN201210327620 A CN 201210327620A CN 103667976 A CN103667976 A CN 103667976A
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- steel
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- ascalloy
- heat resistant
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Abstract
The invention discloses ferrite heat resistant steel. The heat resistant steel comprises the following components by weight percent: 0.18-0.22% of C, 0.15-0.25% of Si, 1.5-1.7% of Mn, 15.5-16.5% of Cr, 0.6-0.8% of Ni, 0.6-0.8% of V, 0.15-0.25% of Ti, 3.50-4.50% of Co, 1.30-1.50% of Cu, 0.02-0.04% of B, 0.15-0.25% of N, 0.30-0.50% of Zr, less than or equal to 0.03 of S, less than or equal to 0.05 of P, and the balance of Fe and inevitable impurities.
Description
Technical field
The present invention relates to ferrous metallurgy field, particularly a kind of jessop.
Background technology
Take the boiler of generating use and atomic energy generating equipment that steam turbine is representative, chemical industry device etc., often adopt austenite-series heat-resistant steel or Ascalloy to prepare, so that these devices can be used for a long time under high temperature and high pressure environment.And Ascalloy because low price, coefficient of thermal expansion is low, heat-resistant anti-fatigue performance is good, so be applied to high temperature with in parts more.
In recent years, along with the intensification of the severe degree of steel applied environment, for the use properties of Ascalloy, particularly stricter for the requirement of creep strength and resistance of oxidation.Often adopt and improve Cr content to 10%～13% in steel at present, thus the method for raising material resistance of oxidation.But along with the raising of Cr content there will be relatively large delta ferrite in structure of steel structure, this high temperature creep strength for material and toughness are disadvantageous.
At present, prior art extensively adopts and adds austenite element and suppress the formation of delta ferrite in steel as C, Ni, Co, Cu.But, add C and can make material welding property reduce; Add Ni and can make Ac1 transition point decline, raising that will restriction tempering temperature, although and tempering temperature low for creep rupture strength between the low-temperature short-time of steel, be favourable, unfavorable for the long time creep rupture strength at high temperature of steel; Add Co and be conducive to improve the creep rupture strength of steel, but add excessive Co, especially over 3% Co, can reduce the creep rupture strength of 12%Cr steel; Add appropriate Cu little for the Affecting Rupture Strength of steel, but the Cu adding over 1.0% can reduce material workability.
Up to now, a lot of patents have been declared for 12%Cr jessop in countries in the world, and these technology are by add Co and Cu improves material property simultaneously.
In Japanese patent application JP10219403A, JP2002180208, JP2005023378, JP08120414, JP05311345A, JP07062497A and the disclosed steel of Chinese patent CN02809922.2, added Ni, Ni declines Ac1 transition point, can limit the raising of tempering temperature like this, this is disadvantageous for the long time creep rupture strength at high temperature that improves steel.
In the disclosed steel of Japanese patent application JP05311346A, added W but do not contained Mo, still, adding W and Mo can be of value to the creep rupture strength that improves steel simultaneously.
Although mention in the disclosed steel of Japanese patent application JP2002004008 that selectivity adds Co, for the interpolation of Co, there is no clear and definite scope, also mention the Ta of interpolation≤4.0 simultaneously.
In the disclosed steel of Japanese patent application JP08218154A, in order to suppress the ferritic formation of high temperature, add excessive Co, but do not add Cu, be unfavorable for like this improving the enduring quality of steel, also do not add B simultaneously in steel, this is also unfavorable for stable carbide.
In the disclosed steel of Japanese patent application JP08225832A, do not add B, be unfavorable for improving creep rupture strength and the stable carbide of steel.
In the disclosed steel of Japanese patent application JP08225833A, propose to add Co, but this interpolation is as a kind of heating treatment method that reduces remained austenite content rather than as a kind of chemical composition of steel; The chemical composition wide scope of the steel that in addition, this application relates to and can not therefrom obtain the instruction in purposes.
In Japanese patent application JP05311344A and the disclosed steel of patent JP09291308A, add the addition of C o and Cu simultaneously and relate to a kind of relational expression about Cr, Co, Cu.For the jessop of 11%～13%Cr, in order to suppress the formation of delta ferrite, add and surpass 3% Co and/or surpass 3% Cu, not only increase cost, and can reduce creep rupture strength and the workability of steel.
In sum, in the jessop preparation process of 11～13%Cr, under hot conditions, can produce delta ferrite, this high temperature oxidation resisting for jessop, high temperature resistant creep property and creep rupture strength are disadvantageous, can not meet the existing requirement to jessop applied environment.Prior art often produces as Ni, Co, Cu, C etc. suppress delta ferrite by adding some austenite formers, but this often can cause again the reduction of the some other performance of jessop, and the element such as Co is expensive, also can make the manufacturing cost of steel greatly increase.
Summary of the invention
For the deficiencies in the prior art, one of object of the present invention is to provide a kind of Ascalloy.
For achieving the above object, the technical solution used in the present invention is as follows:
An Ascalloy, described high temperature steel is comprised of following component by weight percentage: C:0.18～0.22%, Si:0.15～0.25%, Mn:1.5～1.7%, Cr:15.5～16.5%, Ni:0.6～0.8%, V:0.6～0.8%, Ti:0.15～0.25%, Co:3.50～4.50%, Cu:1.30～1.50%, B:0.02～0.04%, N:0.15～0.25%, Zr:0.30～0.50%, S≤0.03, P≤0.05, surplus is Fe and inevitable impurity.
Preferably, described high temperature steel is comprised of following component by weight percentage: C:0.19～0.21%, Si:0.18～0.22%, Mn:1.55～1.65%, Cr:15.8～16.2%, Ni:0.65～0.75%, V:0.65～0.75%, Ti:0.18～0.22%, Co:3.80～4.20%, Cu:1.35～1.45%, B:0.025～0.035%, N:0.18～0.22%, Zr:0.35～0.45%, S≤0.03, P≤0.05, surplus is Fe and inevitable impurity.
Most preferably, described high temperature steel is comprised of following component by weight percentage: C:0.20%, Si:0.20%, Mn:1.60%, Cr:16.0%, Ni:0.70%, V:0.70%, Ti:0.20%, Co:4.00%, Cu:1.40%, B:0.030%, N:0.20%, Zr:0.40%, S≤0.03, P≤0.05, surplus is Fe and inevitable impurity.
Selection for jessop main alloy element of the present invention and content be the reasons are as follows: carbon: at high temperature, particularly, in the austenitization in the heat process processed of metal product or in final thermal treatment, described carbon stable austenite and result tend to reduce the formation of delta ferrite.Meanwhile, carbon is that the form with carbide or carbonitride exists, and their distribution is worked to the performance of material.Therefore controlling in the present invention carbon element content is 0.19～0.21%.
Silicon: element silicon is the dynamic (dynamical) element that makes liquid steel deoxidation and also limit the thermooxidizing causing because of air or steam.For fear of the formation of delta ferrite its must be restricted; And it also tends to impel the embrittlement in work to deposit mutually, and its upper limit content is limited in 0.22%.Therefore, in the present invention, controlling silicone content is 0.18～0.22%.
Manganese: manganese element can impel deoxidation fixing sulphur, is conducive to improve the impelling strength of material, adds the formation that Mn can reduce delta ferrite simultaneously.
Chromium: this element is dissolved in steel matrix and with the form deposition of carbide simultaneously.Useful to thermal oxidation.
Cobalt: cobalt is austenite former, has the effect that stops delta ferrite to form, and therefore, in the present invention, controlling cobalt contents is 3.50～4.50%.
Vanadium: it is extremely important to creep-rupture strength that this element forms very thin and stable nitride and carbonitride and its.In the present invention, controlling content of vanadium is 0.6～0.8%.
Titanium: this element forms the stability that stable carbonitride and its interpolation have strengthened vanadium compound as vanadium.
Nitrogen: this austenite former can reduce the appearance of delta ferrite.And this element can also form the carbonitride that very thin nitride and stability are much higher than corresponding carbide especially.In the present invention, controlling nitrogen content is 0.18～0.22%.
Boron: this element contributes to stable carbide.
Copper: appropriate copper can stop the generation of delta ferrite increases hardening capacity simultaneously.
Zirconium: can suppress Austenite Grain Growth, control oxide morphology, improve the impelling strength of steel, and improve welding property.
The present invention has following beneficial effect:
(1) jessop of the present invention, owing to containing 15.5～16.5% Cr, has good scale resistance and resistance to steam corrosion.
(2) the present invention is optimized design to the composition of the alloying element of jessop, under theoretical guidance, and filter out suitable constituent content on the basis of a large amount of orthogonal tests, add 1.30～1.50% Cu, 0.30～0.50% Zr, 0.6～0.8% V and 0.15～0.25% Ti, and coordinate Co, B, the content of N and Ni, make each alloying element reach coordination technique effect, make the content of delta ferrite in steel of the present invention be less than 8% and the average equivalent diameter of delta ferrite crystal grain be less than 15 μ m, thereby it is good to obtain impelling strength, heatproof oxidation performance and resistance to steam corrosion performance are good, 600 ℃ of above high jessops of creep strength.
Embodiment
Embodiment mono-
An Ascalloy, described high temperature steel is comprised of following component by weight percentage: C:0.18%, Si:0.25%, Mn:1.5%, Cr:16.5%, Ni:0.6%, V:0.8%, Ti:0.15%, Co:4.50%, Cu:1.30%, B:0.04%, N:0.15%, Zr:0.50%, S≤0.03, P≤0.05, surplus is Fe and inevitable impurity.
Embodiment bis-
An Ascalloy, described high temperature steel is comprised of following component by weight percentage: C:0.22%, Si:0.15%, Mn:1.7%, Cr:15.5%, Ni:0.8%, V:0.6%, Ti:0.25%, Co:3.50%, Cu:1.50%, B:0.02%, N:0.25%, Zr:0.30%, S≤0.03, P≤0.05, surplus is Fe and inevitable impurity.
Embodiment tri-
An Ascalloy, described high temperature steel is comprised of following component by weight percentage: C:0.19%, Si:0.22%, Mn:1.55%, Cr:16.2%, Ni:0.65%, V:0.75%, Ti:0.18%, Co:4.20%, Cu:1.35%, B:0.035%, N:0.18%, Zr:0.45%, S≤0.03, P≤0.05, surplus is Fe and inevitable impurity.
Embodiment tetra-
An Ascalloy, described high temperature steel is comprised of following component by weight percentage: C:0.21%, Si:0.18%, Mn:1.65%, Cr:15.8%, Ni:0.75%, V:0.65%, Ti:0.22%, Co:3.80%, Cu:1.45%, B:0.025%, N:0.22%, Zr:0.35%, S≤0.03, P≤0.05, surplus is Fe and inevitable impurity.
Embodiment five
An Ascalloy, described high temperature steel is comprised of following component by weight percentage: C:0.20%, Si:0.20%, Mn:1.6%, Cr:16.0%, Ni:0.7%, V:0.7%, Ti:0.20%, Co:4.0%, Cu:1.4%, B:0.03%, N:0.20%, Zr:0.40%, S≤0.03, P≤0.05, surplus is Fe and inevitable impurity.
Applicant's statement, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, do not mean that the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to the selection of the interpolation of the equivalence replacement of each raw material of product of the present invention and ancillary component, concrete mode etc., within all dropping on protection scope of the present invention and open scope.
Claims (3)
1. an Ascalloy, it is characterized in that, described high temperature steel is comprised of following component by weight percentage: C:0.18～0.22%, Si:0.15～0.25%, Mn:1.5～1.7%, Cr:15.5～16.5%, Ni:0.6～0.8%, V:0.6～0.8%, Ti:0.15～0.25%, Co:3.50～4.50%, Cu:1.30～1.50%, B:0.02～0.04%, N:0.15～0.25%, Zr:0.30～0.50%, S≤0.03, P≤0.05, surplus is Fe and inevitable impurity.
2. a kind of Ascalloy as claimed in claim 1, it is characterized in that, described high temperature steel is comprised of following component by weight percentage: C:0.19～0.21%, Si:0.18～0.22%, Mn:1.55～1.65%, Cr:15.8～16.2%, Ni:0.65～0.75%, V:0.65～0.75%, Ti:0.18～0.22%, Co:3.80～4.20%, Cu:1.35～1.45%, B:0.025～0.035%, N:0.18～0.22%, Zr:0.35～0.45%, S≤0.03, P≤0.05, surplus is Fe and inevitable impurity.
3. a kind of Ascalloy as claimed in claim 2, is characterized in that, described high temperature steel is comprised of following component by weight percentage: C:0.20%, Si:0.20%, Mn:1.60%, Cr:16.0%, Ni:0.70%, V:0.70%, Ti:0.20%, Co:4.00%, Cu:1.40%, B:0.030%, N:0.20%, Zr:0.40%, S≤0.03, P≤0.05, surplus is Fe and inevitable impurity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210327620.7A CN103667976A (en) | 2012-09-06 | 2012-09-06 | Ferrite heat resistant steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210327620.7A CN103667976A (en) | 2012-09-06 | 2012-09-06 | Ferrite heat resistant steel |
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| CN103667976A true CN103667976A (en) | 2014-03-26 |
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| CN201210327620.7A Pending CN103667976A (en) | 2012-09-06 | 2012-09-06 | Ferrite heat resistant steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107022717A (en) * | 2017-04-25 | 2017-08-08 | 柳州市乾阳机电设备有限公司 | Heat resisting steel |
| CN109477190A (en) * | 2016-07-28 | 2019-03-15 | 博格华纳公司 | Ferritic steel for turbocharger |
-
2012
- 2012-09-06 CN CN201210327620.7A patent/CN103667976A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109477190A (en) * | 2016-07-28 | 2019-03-15 | 博格华纳公司 | Ferritic steel for turbocharger |
| CN109477190B (en) * | 2016-07-28 | 2022-06-07 | 博格华纳公司 | Ferritic steel for turbocharger |
| CN107022717A (en) * | 2017-04-25 | 2017-08-08 | 柳州市乾阳机电设备有限公司 | Heat resisting steel |
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Application publication date: 20140326 |