CN85108118B - Weather-resistant low alloy steel - Google Patents
Weather-resistant low alloy steel Download PDFInfo
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- CN85108118B CN85108118B CN85108118A CN85108118A CN85108118B CN 85108118 B CN85108118 B CN 85108118B CN 85108118 A CN85108118 A CN 85108118A CN 85108118 A CN85108118 A CN 85108118A CN 85108118 B CN85108118 B CN 85108118B
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Abstract
The present invention relates to low alloy weathering steel used for railway vehicles, towers, etc. in environments in contact with the atmosphere. The low alloy weathering steel comprises expensive Cr, Ni and even other rare elements besides Cu, P and other elements. The low alloy weathering steel has abundant resources, cheap V and Xt are used as added elements and are reasonably proportioned to form CuPVXt series weathering steel. The existing devices and conventional technology are utilized for production, and the strength, toughness, weldability, corrosion resistance and other comprehensive properties of the low alloy weathering steel all reach or exceed the standards and the actual product levels of part of foreign weathering steel. The low alloy weathering steel can be made into mother plates of strips, pipes and section bars which are widely used, and a large amount of metal loss caused by atmospheric corrosion is reduced.
Description
The present invention relates to a kind of Weather-resistant low alloy steel.
Metallic corrosion is a kind of principal mode of metallic substance natural loss.According to the investigation of world developed country, the financial loss that metallic corrosion brought accounts for about 3 percent five of national economy total output value then.Data with existing shows that annual nearly 10～20% iron and steel is owing to metallic corrosion has lost.The quantity of the steel and iron member that uses in atmosphere accounts for about 60 percent of world's steel production, metallic substance is exposed in the atmosphere, and the caused corrosion of chemical/electrochemical effect that is subjected to water in air and oxygen etc. is that so-called atomospheric corrosion is a kind of of harm maximum in the metallic corrosion.The metal that loses because of atomospheric corrosion accounts for the over half of total corrosion loss amount.Especially be exposed to the metalwork that uses in the atmosphere for a long time for rail vehicle, bridge, pylon etc., atomospheric corrosion has become the main threat that influences its life-span, has not only caused metal loss, and has increased the workload of making processing and maintain and replace.
The metallic corrosion problem is paid more and more attention.And the corrosion resisting property that improves steel is etch-proof fundamental way.For this reason, it is weathering steel with steel that each state all by every possible means develops atmospheric corrosion resistance, and is widely used in various and the environment that atmosphere contacts.In the country of prosperity, rail vehicle is many to be made with weathering steel.
The rail vehicle of China, owing to all be straight carbon steel manufacturing with the solidity to corrosion difference, so seriously corroded, the life-span is short, changes frequent.Along with the develop rapidly of China's building of the four modernizations, the increase of total volume of railway freight and the increasing of atmospheric corrosion resistance metallic substance demand, the particularly Ministry of Railways determined that as the basic fundamental policy rail vehicle will all be used the weathering steel manufacturing gradually instead from now on.So the weathering steel of development and production China oneself has become the task of top priority.
Improve the atmospheric corrosion resistance of steel, what generally take both at home and abroad is that the method for adding the different-alloy element in steel solves.It is generally acknowledged that Cu, P are the optimal alloying elements of weathering steel, therefore, various countries nearly all without exception be main the employing.But because the interpolation of Cu, P makes steel inevitably produce major defect such as embrittlement again and cause the moulding of steel, toughness etc. to reduce.For this reason, other alloying elements of the adding that each national capital degree is different are to remedy this defective.Much more external constitute the CuPCrNiMn series with Cr, Ni, Mn elements, have in addition at Cr, Ni also adds rare elements such as Sb, Sn, AS, Sr or Nb, Zr, Ta, Ti outward, though can improve the performance of steel, its cost is improved.
" atmospheric corrosion resistance and high temperature resistance crackle steel " its chemical ingredients (%) that the clear 51-071817 of Japanese Patent prospectus introduces is: C≤0.08, Si≤0.75, Mn10～20, P0.05～0.15, Cu0.15～0.60, Cr0.10～0.15, Ni0.15～1.0, Al＜0.10.
U.S. USS standard C or-Ten " B " regulation weathering steel composition (%) is: C0.10～0.19, Si0.15～0.30, Mn0.90～1.25, S≤0.05, P≤0.04, Cu0.25～0.40, Cr0.40～0.65, V0.02～0.10.
Soviet Union's weathering steel 10 * CH Д composition (%) is: C≤0.12Si0.08～1.10, Mn0.35～0.80, P≤0.035, Cu0.40～0.65, Cr0.60～0.90, Ni0.50～0.80.
China Wuhan Iron and Steel Company once developed the 09MnCuPTi weathering steel, but effect is also undesirable.
Metals resources such as the Cr of China, Ni lack, but Cu, P, especially the RE resource is very abundant for V.Obviously, adopt elements such as Cr, Ni to be not suitable for the resources supplIes of China.The metal that adds then makes the cost of steel increase substantially, and also should not adopt.
The objective of the invention is to be based on the china natural resources condition and produce actual, use convenient sources, resourceful alloying element, provide a kind of with low cost, have good atmospheric corrosion resistance and higher-strength, the better weather-proof steel of the simple low-alloy of weldability production technique.
Following measure is achieved above-mentioned purpose owing to the present invention has adopted.
Result of study shows that Cu and P are the very outstanding alloying elements of anti-corrosion effect.Under the condition of atomospheric corrosion, the Cu in the steel is the cathodic depolarization agent, and P is the anode depolarizer.After alloying element cu and P add, can quicken the uniform dissolution and the Fe＜` of steel; ++; `〉the ionic oxidation rate, help on the steel surface, to form uniform V-FeOOH rusty scale, promote to generate the fine and close protective membrane of non-crystalline state hydrous iron oxide, play a protective role.Can carry out some corrosion reactions by interior rusty scale.The result continues to generate amorphous substance, rusty scale densification more in making, and final formation almost completely can not be carried out the barrier of corrosion process, is reflected on the electrochemical behavior of steel to see that anodic process is blocked.Time, longer its compactness extent was more perfect, and anti-corrosion effect also more obviously.
In addition, rejected regions such as crackle in the rusty scale pit and cavity have alloying element deposition and enrichments such as Cu, P, with regard to energy correction of the defect portion, make the inside of steel no longer continue to be corroded whereby.
Cu and P element play a part solution strengthening simultaneously in steel.
V is the strong carbide forming element, in steel with VC and V
4C
3Form exists, and plays a part precipitation strength, improves the obdurability of steel.Because V has captured partial C in the steel, thereby has reduced Fe
3The content of C reduces microstructure Medium pearlite composition, has therefore improved the solidity to corrosion of steel.
The adding of RE mainly works to purify steel and control inclusion morphology (making it nodularization), thereby has improved the toughness and the anti-corrosion capability of steel.This is the one of the main reasons that makes the over-all properties raising of steel.
According to research and experimental analysis, the chemical ingredients of determining Weather-resistant low alloy steel of the present invention mainly contains C, Si, Mn, P, Cu, V, the RE rational proportion by CuPVRE, produce comprehensive action with other elements, constitute the Weather-resistant low alloy steel of CuPVRE series.Its composition content by weight percentage is: C≤0.12, Si0.20～0.75, Mn0.20～0.70, S≤0.04, Cu0.20～0.50, P0.06～0.15, V0.02～0.12, RE(add-on)≤0.20 all the other be Fe and impurity.
Further investigate and verify that the preferential composition of recommending (%) is: C0.06～0.10, Si0.30～0.40, Mn0.35～0.45, Cu0.25～0.30, P0.08～0.10, V0.04～0.08, RE0.05～0.10 through producing.
Compare with the weather-proof steel of external low-alloy, the present invention has removed expensive alloying elements such as Cr, Ni, and V that the employing price is low, the source is wide and RE form CuPVRE series low alloy steel as main adding elements, strengthen the tissue of steel, the raising over-all properties.
The smelting of weathering steel of the present invention is applicable to various flat, converter operations, adopts common process substantially.Also can adopt new technologies such as top bottom blowing, winding-up, external refining.
Cu is alloying in stove, alloying in jar such as P, V, RE.The general method of making a bet that adopts is poured into a mould.
V alloyization can add vanadium iron and vanadium slag in the steel, but best Argon when adding vanadium slag.
The rough rolling mill is sent in ingot iron demoulding after heat.Be neutrality or reducing atmosphere in the control soaking pit, maximum heating temperature is 1340～1360 ℃, reduces the time to be rolled as far as possible.
Steel billet heating, rollingly carry out by the high-quality steel according to blank and trimmed size, control is opened, finishing temperature.
Take above-mentioned technology, can reach more than 84% to the material finished product rate from ingot.
The metallographic structure of weathering steel of the present invention is ferrite+perlite, and grain fineness number reaches 7～8 grades, is 9 grades on a small quantity.Not only have good atomospheric corrosion performance, and over-all properties is better, can produces by part International Standards Organization substantially.
Copper phosphorus vanadium rare earth Weather-resistant low alloy steel performance
The v-notch Charpy impact value
Cold-bending property has been made the more harsh B=5a of d=2a, d=a, d=0 and condition in α=180 ° under the condition of B=2a, the clod wash of B=7a and cold wide test, and the result is all qualified.
Select for use knot 502WCu and two kinds of welding rods of 506WCu to weld experiment, not only the performance of welding joint heat affected zone and weld metal and mother metal are suitable, and corrode fast through 50 days indoor salt fogs, and the etchback phenomenon does not take place in each joint, and its solidity to corrosion is better than mother metal.
Atmospheric corrosion resistance is the main performance index of weathering steel.Be selected in subtropics (Guangzhou), humid zone (Chengdu), marine atmosphere (Qingdao) and four representational areas of industrial atmosphere for this reason respectively and hang up the outdoor static lacing film that exposes.
Outdoor static steel result
The dynamic hanging test result of carriage top
By above result as seen, CuPVRE Weather-resistant low alloy steel of the present invention has good comprehensive performances.The section bar, sheet material, the tubing that can be made into different shape use in the environment of atmosphere contact.
Claims (2)
1, a kind of weather resisting steel, the chemical ingredients that it is characterized in that steel content by weight percentage is C≤0.12, Si0.20～0.75, Mn0.20～0.70, Cu0.20～0.50, P0.06～0.15, V0.02～0.12, RE(add-on)≤0.20S≤0.04, all the other are Fe and impurity.
2,, it is characterized in that weight percent content (%) is according to the said steel of claim 1: C0.06～0.10, Si0.30～0.40Mn0.35～0.45, Cu0.25～0.30, P0.08～0.10, V0.04 ,～0.08, RE0.05～0.10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85108118A CN85108118B (en) | 1985-11-01 | 1985-11-01 | Weather-resistant low alloy steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85108118A CN85108118B (en) | 1985-11-01 | 1985-11-01 | Weather-resistant low alloy steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85108118A CN85108118A (en) | 1987-05-06 |
| CN85108118B true CN85108118B (en) | 1987-11-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85108118A Expired CN85108118B (en) | 1985-11-01 | 1985-11-01 | Weather-resistant low alloy steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85108118B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1030707A (en) * | 1996-07-12 | 1998-02-03 | Honda Motor Co Ltd | High fatigue strength gear |
-
1985
- 1985-11-01 CN CN85108118A patent/CN85108118B/en not_active Expired
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| Publication number | Publication date |
|---|---|
| CN85108118A (en) | 1987-05-06 |
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