CN101705441A - High-strength low-alloy steel resistant to sulfuric acid dew point corrosion - Google Patents
High-strength low-alloy steel resistant to sulfuric acid dew point corrosion Download PDFInfo
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- CN101705441A CN101705441A CN200910272905A CN200910272905A CN101705441A CN 101705441 A CN101705441 A CN 101705441A CN 200910272905 A CN200910272905 A CN 200910272905A CN 200910272905 A CN200910272905 A CN 200910272905A CN 101705441 A CN101705441 A CN 101705441A
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Abstract
The invention provides high-strength low-alloy steel resistant to sulfuric acid dew point corrosion, which is characterized in that the steel contains the following components (in percentage by weight): 0.01 to 0.10 percent of C, 0.20 to 0.40 percent of Si, 0.35 to 1.0 percent of Mn, 0.01 to 0 .05 percent of S, 0.3 to 0.6 percent of Ni, 0.5 to 1.0 percent of Cr, 0.3 to 0.5 percent of Cu, 0.01 to 0.15 percent of Sb, 0.01 to 0 .10 percent of Re, 0.01 to 0 .10 percent of Mo, 0.01 to 0 .10 percent of Nb, 0.01 to 0 .10 percent of Ti, 0.01 to 0 .10 percent of V, and the balance of Fe and inevitable impurities, wherein the total content of alloying elements is less than or equal to 3. The invention has a plurality of alloying elements added at the same time, so that the effects of high strength and corrosion resistance are achieved through the small-amount multi-component effect of the alloying elements.
Description
Technical field
The invention belongs to the low alloy steel technical field, be specifically related to a kind of synergy of utilizing between multi-element alloyed on a small quantity and element, to reach the high-strength low-alloy steel resistant to sulfuric acid dew point corrosion that has excellent etch resistant properties, has higher-strength simultaneously.
Background technology
The corrosionproof steel against sulfuric acid at dew point widespread usage is the smoke processing system of main fuel at industrial circles such as metallurgy, electric power, petrochemical industry with coal or heavy oil, as desulfurizer in air preheater, economizer, flue, chimney, rail truck, oil derrick, production vessel and the chemical petroleum equipment at boiler low-temperature position etc.Domestic development and exploitation for corrosionproof steel against sulfuric acid at dew point started late, composition system and use standard are generally used for reference the steel grade of Japan, the B485NL of company of Baogang Stocks Trading Co., ND (09CrCuSb) steel of Jiangyin special steel are wherein typically arranged, in addition, also there are the corrosionproof steel against sulfuric acid at dew point product in JNS (12MnCuCr) steel and the Baosteel one steel company (NS1) of Anshan iron and steel plant (10Cr1Cu), Ji steel.But the corrosion resistance to sulfuric acid dew point of these steel can not satisfy the actual production demand far away, and especially its intensity is on the low side, easily causes the rupture failure of chimney, production vessel, chemical industry equipment equivalent-load spare.Therefore, the present invention is intended to work out a kind of low alloy steel of high-strength high sulfuric acid dew point corrosion resistant, and satisfying all kinds of with high cost performance is the demand of main fuel smoke processing system with coal or heavy oil.
Summary of the invention
The objective of the invention is to utilize the synergy between a small amount of multi-element alloyed and multiple element, a kind of corrosion resistance to sulfuric acid dew point excellence, high-strength low-alloy steel resistant to sulfuric acid dew point corrosion that intensity is high are provided in order to solve the deficiency that the above-mentioned background technology exists.
For achieving the above object, the present invention adopts following technical scheme: a kind of high-strength low-alloy steel resistant to sulfuric acid dew point corrosion, it is characterized in that it contains following (weight %) component: C:0.01-0.10, Si:0.20～0.40, Mn:0.35～1.0, S:0.01-0.05, Ni:0.3～0.6, Cr:0.5～1.0, Cu:0.3～0.5, Sb:0.01～0.15, Re:0.01-0.10, Mo:0.01-0.10, Nb:0.01-0.10, Ti:0.01-0.10, V:0.01-0.10, all the other are Fe and inevitably are mingled with, wherein, alloying element total content≤3.
Above-mentioned a kind of high-strength low-alloy steel resistant to sulfuric acid dew point corrosion can also contain weight percent smaller or equal to 0.025 P.
In such scheme, the content of described alloying element preferably satisfies welding cold crack sensitivity coefficient: Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10≤0.20%.The welding cold cracking proneness of the low more expression steel of Pcm value is low more.
Compare with current material, steel grade mechanical property excellence of the present invention, yield strength and tensile strength reach 350MPa and 480MPa respectively.With the contrast of JNS steel, its corrosion resistance to sulfuric acid dew point has improved more than 50%.The present invention adds multiple alloying element simultaneously, and a small amount of polynary effect by alloying element reaches high-strength and anti-corrosion effect.Alloying element gross weight of the present invention≤3% has been given full play to the effect of all kinds of alloying elements, has reduced the raw material total cost.
The effect of each element among the present invention and the reason that content limits below are described in detail in detail.
C content requirement 0.01-0.10%.C is important strengthening element among the present invention, in steel, mainly exist with the carbide form, with the combination plaing a part of carbonization forming element precipitation strength and crystal grain thinning. and too high carbon content is unfavorable for weldability and toughness, can increase either pearlite occurred and banded structure simultaneously, easily cause the ununiformity of micro-area composition segregation and tissue, thereby produce micro-cell corrosion.
Si content is chosen in 0.20～0.40% among the present invention.Si has higher solid solubility in steel, the solid solution strengthening effect of steel is higher than Mn, can increase ferrite volume fraction in the steel, makes grain refining, helps improving toughness.The Si too high levels can cause weldability and welding heat influence area toughness to worsen, and is unfavorable to low-temperature impact toughness.
Mn content is 0.35～1.0% among the present invention.Mn solid solution in steel is important highly malleablized element in the effect of ferrite solution strengthening, and content is crossed low ferrite and strengthened deficiency, and too high levels will improve the hardening capacity of steel, thereby causes weldability and welding heat influence area toughness to worsen.
P content requirement≤0.025% among the present invention, S requires 0.01-0.05%.P, S easily form harmful being mingled with in steel, worsen low-temperature impact toughness and welding property, promote the anisotropy of steel.
Ni content is chosen as 0.3～0.6% among the present invention.Ni can improve hardening capacity, has certain strengthening effect, can also improve the low-temperature flexibility of steel significantly, and base material and welded heat affecting zone low-temperature flexibility are increased substantially.The hot-short check crack that causes that can also effectively stop simultaneously, Cu.
Cr content is chosen as 0.5～1.0% among the present invention.Cr can improve the hardening capacity of steel, promotes the steel surface to generate stable passive film, thereby greatly improves the corrosion resisting property of steel.Generally be just to occur obvious effects under the cooperation of copper, its content is crossed the low solidity to corrosion that can not guarantee steel, greater than 1.00% o'clock, can make the anti-H of steel
2SO
4Corrosive nature decreases.
Cu content is chosen as 0.3～0.5% among the present invention.Cu is fundamental element in weather resisting steel and the corrosionproof steel against sulfuric acid at dew point.When containing the sulphur of q.s in the steel, in industrial gasses and vitriolic corrosion process, can generate Cu
2The S protective membrane, the reaction of retardance cathode and anode, thus improve the steel corrosion resistance to sulfuric acid dew point.The protective value of the while copper enrichment in rusty scale can improvement rusty scale.During too high levels, can reduce welding property, and easily form low-melting cocrystalization compound and make in the System on Rolling Steel and to produce be full of cracks.
Sb content is chosen as 0.01～0.15% among the present invention.Sb is very effective to improving solidity to corrosion, and Sb forms Cu on the steel surface
2The Sb film can suppress cathodic reaction, does not present effect less than 0.01% o'clock, has the tendency of welding property deterioration when too high,
Re content is 0.01-0.10% among the present invention.The purpose that Re mainly improves steel toughness by changing shape, quantity and the distribution of steel inclusion, reaching, reduces harmful non-metallic inclusion.RE helps the effect performance of Ti when existing jointly with Ti, significantly the toughness at the welding joint position of the big heat input more than the hot 100KJ/cm of improvement input.When its too high levels, make the toughness deterioration at welding junction place.
Require Mo:0.01-0.10% among the present invention.Mo can improve hardening capacity, significantly improves the intensity of steel, helps to improve solidity to corrosion with the synergy of Cr.Too high Mo can make the low-temperature flexibility of steel significantly worsen, and forms martensite when welding, causes the brittle increase of welding joint.
Nb, V, Ti are to the highly malleablized effective elements, can form precipitate, and crystal grain thinning makes the dense internal organization of steel, reduces timeliness susceptibility and cold shortness, improves welding property.But content surpasses the tendency that had the solidity to corrosion deterioration at 0.10% o'clock, so preferred upper limit is 0.10% among the present invention.
Embodiment
Embodiment 1: adopt open hearth and electrosmelting, rare earth adds in the process of coming out of the stove or in the ladle after the tapping, can be made into sheet material, tubing, section bar etc. after the continuous casting and rolling, its chemical ingredients following (weight %): C:0.07, Si:0.34, Mn:0.52, P:0.011, S:0.015, Ni:0.45, Cr:0.73, Cu:0.38, Sb:0.09, Re:0.10, Mo:0.06, Nb:0.04, Ti; 0.07, V:0.03, Fe: surplus.
On the steel plate of present embodiment, the sample of intercepting 40 * 40 * 4mm at 70 ℃, soaked 4 hours in 50% the aqueous sulfuric acid, carry out the sulfuric acid immersion test with reference to GB10124-88 " metallic substance laboratory uniform corrosion total immersion test method " standard, test-results is shown in Table 1.The mechanical property contrast is shown in Table 2.
Sulfuric acid dew point corrosion speed contrast (the mm y of the different steel of table 1
-1)
The mechanical property contrast of the different steel of table 2
* d flexual center diameter, a steel plate thickness
Embodiment 2: present embodiment is substantially the same manner as Example 1, difference is composition, and the present embodiment chemical ingredients is (weight %): C:0.06, Si:0.38, Mn:0.57, P:0.016, S:0.013, Ni:0.54, Cr:0.84, Cu:0.41, Sb:0.11, Re:0.05, Mo:0.07, Nb:0.05, Ti; 0.06, V:0.02, Fe: surplus.
On the steel plate of present embodiment, the sample of intercepting 40 * 40 * 4mm, at 30 ℃, soaked 24 hours in 20% the aqueous sulfuric acid, carry out the sulfuric acid immersion test with reference to GB10124-88 " metallic substance laboratory uniform corrosion total immersion test method " standard, test-results is shown in Table 3, and the mechanical property contrast is shown in Table 4.
Sulfuric acid dew point corrosion speed contrast (the mm y of the different steel of table 3
-1)
The mechanical property contrast of the different steel of table 4
* d flexual center diameter, a steel plate thickness
Embodiment 3: present embodiment is substantially the same manner as Example 1, difference is composition, the present embodiment chemical ingredients is (weight %): C:0.10, Si:0.40, Mn:1.0, S:0.05, Ni:0.6, Cr:1.0, Cu:0.5, Sb:0.15, Re:0.10, Mo:0.10, Nb:0.10, Ti:0.10, V:0.10, and all the other are Fe and inevitably are mingled with.
On the steel plate of present embodiment, the sample of intercepting 40 * 40 * 4mm, at 30 ℃, soaked 24 hours in 20% the aqueous sulfuric acid, carry out the sulfuric acid immersion test with reference to GB10124-88 " metallic substance laboratory uniform corrosion total immersion test method " standard, test-results is shown in Table 5, and the mechanical property contrast is shown in Table 6.
Sulfuric acid dew point corrosion speed contrast (the mm y of the different steel of table 5
-1)
The mechanical property contrast of the different steel of table 6
* d flexual center diameter, a steel plate thickness
Embodiment 4: present embodiment is substantially the same manner as Example 1, difference is composition, the present embodiment chemical ingredients is (weight %): C:0.01, Si:0.20, Mn:0.35, S:0.01, Ni:0.3, Cr:0.5, Cu:0.3, Sb:0.01, Re:0.01, Mo:0.01, Nb:0.01, Ti:0.01, V:0.01, and all the other are Fe and inevitably are mingled with.
On the steel plate of present embodiment, the sample of intercepting 40 * 40 * 4mm, at 30 ℃, soaked 24 hours in 20% the aqueous sulfuric acid, carry out the sulfuric acid immersion test with reference to GB10124-88 " metallic substance laboratory uniform corrosion total immersion test method " standard, test-results is shown in Table 7, and the mechanical property contrast is shown in Table 8.
Sulfuric acid dew point corrosion speed contrast (the mm y of the different steel of table 7
-1)
The mechanical property contrast of the different steel of table 8
* d flexual center diameter, a steel plate thickness.
Claims (3)
1. high-strength low-alloy steel resistant to sulfuric acid dew point corrosion, it is characterized in that it contains following (weight %) component: C:0.01-0.10, Si:0.20～0.40, Mn:0.35～1.0, S:0.01-0.05, Ni:0.3～0.6, Cr:0.5～1.0, Cu:0.3～0.5, Sb:0.01～0.15, Re:0.01-0.10, Mo:0.01-0.10, Nb:0.01-0.10, Ti:0.01-0.10, V:0.01-0.10, all the other are Fe and inevitably are mingled with, wherein, alloying element total content≤3.
2. a kind of high-strength low-alloy steel resistant to sulfuric acid dew point corrosion according to claim 1 is characterized in that it also contains weight percent smaller or equal to 0.025 P.
3. a kind of high-strength low-alloy steel resistant to sulfuric acid dew point corrosion according to claim 1 and 2 is characterized in that the content of alloying element satisfies welding cold crack sensitivity coefficient: Pcm=C+Si/30+ (Mn+Cu+Cr)/20+Mo/15+Ni/60+V/10≤0.20%.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103160753A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | Zr-containing sulfuric acid dew point corrosion resistant steel plate and manufacturing method thereof |
| CN103397280A (en) * | 2013-08-15 | 2013-11-20 | 卓然(靖江)设备制造有限公司 | Corrosion resistance steel and production method thereof |
| CN104858568A (en) * | 2015-03-31 | 2015-08-26 | 上海焊接器材有限公司 | Gas shielded flux cored welding wire resistant to sulfuric acid dew point corrosion, and preparation method thereof |
| CN109536827A (en) * | 2014-03-28 | 2019-03-29 | 日新制钢株式会社 | The steel plate and manufacturing method and exhaust flow path component parts that resistance to acid dew piont corrosion is improved |
| CN111560556A (en) * | 2020-05-22 | 2020-08-21 | 包头钢铁（集团）有限责任公司 | Preparation method of low-cost sulfuric acid corrosion-resistant 09CrCuSbRE hot-rolled round steel |
-
2009
- 2009-11-24 CN CN200910272905A patent/CN101705441A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103160753A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | Zr-containing sulfuric acid dew point corrosion resistant steel plate and manufacturing method thereof |
| CN103160753B (en) * | 2011-12-14 | 2015-12-09 | 鞍钢股份有限公司 | Zr-containing sulfuric acid dew point corrosion resistant steel plate and manufacturing method thereof |
| CN103397280A (en) * | 2013-08-15 | 2013-11-20 | 卓然(靖江)设备制造有限公司 | Corrosion resistance steel and production method thereof |
| CN109536827A (en) * | 2014-03-28 | 2019-03-29 | 日新制钢株式会社 | The steel plate and manufacturing method and exhaust flow path component parts that resistance to acid dew piont corrosion is improved |
| CN104858568A (en) * | 2015-03-31 | 2015-08-26 | 上海焊接器材有限公司 | Gas shielded flux cored welding wire resistant to sulfuric acid dew point corrosion, and preparation method thereof |
| CN111560556A (en) * | 2020-05-22 | 2020-08-21 | 包头钢铁（集团）有限责任公司 | Preparation method of low-cost sulfuric acid corrosion-resistant 09CrCuSbRE hot-rolled round steel |
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Application publication date: 20100512 |