CN1037535C - High-temp. anti-carbonizing Austenite steel - Google Patents
High-temp. anti-carbonizing Austenite steel Download PDFInfo
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- CN1037535C CN1037535C CN94102822A CN94102822A CN1037535C CN 1037535 C CN1037535 C CN 1037535C CN 94102822 A CN94102822 A CN 94102822A CN 94102822 A CN94102822 A CN 94102822A CN 1037535 C CN1037535 C CN 1037535C
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Abstract
The present invention belongs to the field of alloy steel, which is mainly used in a high-temperature hot corrosive environment (particularly to in a bad carburization environment) to be used as steel for structure components. The content of Cr and Ni is properly increased in the steel of the present invention to cause the steel to have high high-temperature oxidation resistance and hot-corrosion resistance, by composite alloying for trace elements, the steel of the present invention has stable structure, and the combination property of the present invention is improved. Compared with HP type steel in the prior art, the high-temperature carburization resistance of steel is obviously better than that of the steel in the prior art, and the high-temperature strength of the steel is obviously improved.
Description
The invention belongs to field of alloy steel.Mainly be applicable to and particularly under abominable carburizing environment, be used as structure steel under the elevated temperature heat corrosive environment.
In chemical engineering industry, parts such as radiant coil are the key parts in the ethane cracking furnace, and it is in high temperature (1000 ℃～1150 ℃) and the stronger carburizing environment for a long time, and will bear certain pressure.Use the material that is generally the HP type in this field in the prior art.For example be used as the Cr that has of radiating furnace tube and relevant parts
25Ni
35Si and Cr
25Ni
35Steel grades such as WNb by the made radiating furnace tube of these materials etc., find that its material capability obviously descends use for some time in ethane cracking furnace after.Reason just is that the HP types of material is used in material itself in this field and has obvious defective such as reduction in carburizing phenomenon serious and work-ing life of being made parts.Therefore as the high-temperature anti-carburization material, the HP types of material is used in this field, is the requirement that can not satisfy the design and use of equipment integral fully.And the highest design use temperature can not be above 1100 ℃.
The objective of the invention is to propose a kind of the have good high-temperature anti-carburization performance and the austenite high-temperature anti-carburization steel of good high-temperature intensity.
According to purpose of the present invention, the concrete composition design of the austenite high-temperature anti-carburization steel that we proposed is (weight %) C0.3-0.6%, Si0.8-2.0%, Mn≤2.5%, Cr29-38%, Ni39-48%, Nb0.5-2.5%, Al0.05-1.0%, Ti0.05-1.0%, Zr0.001-0.2%, Mo≤0.5%, Ce0.001-0.2%, Mg0.0005-0.01%, all the other are Fe.
In order to overcome deficiency of the prior art, make the anti-carburizing energy of austenite high-temperature anti-carburization steel of the present invention, over-all propertieies such as resistance to high temperature corrosion performance and hot strength are improved, and therefore in the composition design of steel of the present invention, chromium, nickel content as basic composition are all increased.Chromium content should be in 29～38% scopes in steel of the present invention, its objective is when guaranteeing 1100-1200 ℃ of steel to have the ability of better high temperature oxidation resistance, thermophilic corrosion-resistance (impervious carbon, anti-sulphur and combustion ash corrosion).Nickel content should be controlled in the 39-48% scope, and its reason is that the anti-carburizing that improves steel can and can obtain stable austenite structure, keeps steel that basic hot strength is arranged.Carbon content is in the 0.3-0.6% scope, and this can guarantee the hot strength of steel, improves the casting technique performance and the requirement of satisfying production technique of steel.In steel of the present invention, add the effect that other element played and also have, in steel, add Nb, can form the carbide of Nb, reach the hot strength effect that improves steel.Add a certain amount of Ti, can form the double carbide of Nb and Ti, play the stabilizing effect that improves carbide, impel hot strength further to improve.The silicon that adds high level in the steel can improve the high-temperature anti-carburization performance of steel, helps improving the high-temperature oxidation resistance of steel simultaneously, and improves the flowability of steel.In steel, add a spot of aluminium in addition, particularly with the compound action of cerium and silicon under, all be very favorable to high-temperature anti-carburization performance and the antioxidant property that improves steel.The control but the content of Si, Al must be limited the quantity of is because too much Si, Al content bring detrimentally affect can for the mechanical property of steel.The comprehensive action of trace elements such as adding Zr, Ce, Mg in the steel is arranged again, is the grain fineness number that is the refinement steel, improves the plasticity of steel and purifies crystal boundary, and then strengthen crystal boundary.By the composite alloying of these more trace elements, can further improve the anti-carburizing energy and the high temperature creep strength of steel of the present invention.
Austenite high-temperature anti-carburization steel of the present invention can adopt electric arc furnace and medium-frequency induction furnace to smelt, and can adopt castmethod production after smelting, and is cast as the spun cast pipe and the various static foundry goods of different size.
Austenite high-temperature anti-carburization steel of the present invention has following characteristics compared with prior art.Because the chromium nickel content in the suitable raising steel of steel of the present invention, so steel of the present invention has higher high-temperature anti-carburization and high temperature resistance gaseous corrosion performance than HP class shape steel, and can obtain stable austenite structure, thereby has higher high temperature strength again.An amount of some trace elements of adding in steel of the present invention have not only improved the structure stability of this steel grade, and have significantly improved the mechanical property of this steel grade.Steel of the present invention is compared with the HP types of steel of prior art and obviously is being better than the HP+W+Nb steel grade aspect the high-temperature anti-carburization, and its test comparing result is seen accompanying drawing.1. curves are represented the HP types of steel in the accompanying drawings.2 curves are represented steel of the present invention.Ordinate is carbon concentration content (%).Abscissa is the carbon penetration degree of depth (mm).Carburizing temperature is that 1100 ℃ of test periods are 150 hours.
Embodiment
According to the composition scope of austenite high-temperature anti-carburization steel of the present invention, we adopt medium-frequency induction furnace to smelt three stove steel altogether.Smelted simultaneously a stove HP+W+Nb steel again for the ease of contrast.The concrete chemical component content of every stove steel sees Table 1.Table 1 is that Chemical Composition content contrast sequence number 1.2.3 in table 1 of steel of the present invention and prior art steel is the concrete Chemical Composition of steel of the present invention.HP+W+Nb is the prior art steel grade.Each stove steel after smelting all is cast into spun cast pipe, and has carried out high-temperature anti-carburization test and mechanical property test.The high-temperature anti-carburization test-results is seen accompanying drawing, and each test parameter was narrated in specification sheets.Table 2 be the embodiment of the invention at room-temperature property and comparing result, show that by comparing result steel of the present invention has higher temperature-room type plasticity.Table 3 is the high-temperature and durable tearing test comparing result of the embodiment of the invention.Test is the creep rupture test of carrying out under 1100 ℃ of high temperature, and proof stress is σ=13MPa.Can find out that by table 3 comparing result steel comparison of the present invention has higher hot strength than grade of steel HP+W+Nb.
The composition contrast (weight %) of table 1 steel embodiment of the present invention and prior art steel
| The element sequence number | C | Si | Mn | Cr | Ni | Nb | Al | Ti | Zr | Mo | Ce | Mg | Fe | W |
| 1 | 0.42 | 1.42 | 2.19 | 34.97 | 46.02 | 0.69 | 0.74 | 0.14 | 0.15 | 0.27 | 0.12 | 0.0008 | Surplus | / |
| 2 | 0.33 | 0.92 | 0.80 | 36.75 | 43.77 | 1.50 | 0.56 | 0.21 | 0.08 | 0.33 | 0.008 | 0.0051 | Surplus | / |
| 3 | 0.57 | 2.00 | 1.44 | 30.91 | 40.90 | 2.36 | 0.069 | 0.87 | 0.021 | 0.49 | 0.001 | 0.0082 | Surplus | / |
| HP+W+Nb | 0.43 | 1.2 | 1.1 | 25.42 | 35.70 | 1.08 | / | / | / | / | / | / | Surplus | 1.25 |
Table 2 steel embodiment of the present invention room-temperature property and comparing result
| Heat (batch) number | σ b | σ s | δ |
| 1 | 572 | 305 | 22.0 |
| 2 | 575 | 320 | 21.6 |
| 3 | 576 | 327 | 15.8 |
| HF+W+Nb | 525 | 265 | 9.44 |
Table 3 steel high-temperature and durable of the present invention tearing test comparing result
| Heat (batch) number | Test conditions | Lasting disconnected type time hour | |
| Temperature, ℃ | Stress, MPa | ||
| 1 | 1100 | 17.36 | 211 |
| 13 | 587 | ||
| 2 | 1100 | 17.36 | 256 |
| 13 | 687 | ||
| 3 | 1100 | 17.36 | 178 |
| 13 | 553 | ||
| HP+W+Nb | 1100 | 17.36 | 105 |
| 13 | 355 | ||
Claims (1)
1. austenite high-temperature anti-carburization steel, the concrete Chemical Composition scope that it is characterized in that this steel is (weight %) C0.3-0.6%, Si0.8-2.0%, Mn≤2.5%, Cr29-38%, Ni39-48%, Nb0.5-2.5%, Al0.05-1.0%, Ti0.05-1.0%, Zr0.001-0.2%, Mo≤0.5%, Ce0.001-0.2%, Mg0.0005-0.01%, all the other are Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94102822A CN1037535C (en) | 1994-03-23 | 1994-03-23 | High-temp. anti-carbonizing Austenite steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94102822A CN1037535C (en) | 1994-03-23 | 1994-03-23 | High-temp. anti-carbonizing Austenite steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1095424A CN1095424A (en) | 1994-11-23 |
| CN1037535C true CN1037535C (en) | 1998-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94102822A Expired - Fee Related CN1037535C (en) | 1994-03-23 | 1994-03-23 | High-temp. anti-carbonizing Austenite steel |
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|---|---|
| CN (1) | CN1037535C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100415926C (en) * | 2006-01-20 | 2008-09-03 | 烟台百思特炉管厂 | Microalloyed nickel chromium high-temperature alloy material and method for preparing the same |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5440720B2 (en) * | 2011-01-25 | 2014-03-12 | 新日鐵住金株式会社 | Steel for carburizing or carbonitriding |
| TWI507546B (en) * | 2014-08-05 | 2015-11-11 | China Steel Corp | Austenitic alloy and fabricating method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5021215A (en) * | 1989-01-30 | 1991-06-04 | Sumitomo Metal Industries, Ltd. | High-strength, heat-resistant steel with improved formability and method thereof |
-
1994
- 1994-03-23 CN CN94102822A patent/CN1037535C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5021215A (en) * | 1989-01-30 | 1991-06-04 | Sumitomo Metal Industries, Ltd. | High-strength, heat-resistant steel with improved formability and method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100415926C (en) * | 2006-01-20 | 2008-09-03 | 烟台百思特炉管厂 | Microalloyed nickel chromium high-temperature alloy material and method for preparing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1095424A (en) | 1994-11-23 |
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