CN1924066A - Steel for pipeline steel tube with excellent hydrogen sulfide breakage resistance - Google Patents
Steel for pipeline steel tube with excellent hydrogen sulfide breakage resistance Download PDFInfo
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- CN1924066A CN1924066A CN 200510099019 CN200510099019A CN1924066A CN 1924066 A CN1924066 A CN 1924066A CN 200510099019 CN200510099019 CN 200510099019 CN 200510099019 A CN200510099019 A CN 200510099019A CN 1924066 A CN1924066 A CN 1924066A
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Abstract
The invention discloses a pipe steel to prevent hydrogen sulfide fracture, which comprises the following parts: 0.02-0.15% C, 0.01-0.50% Si, 0.50- 1.20% Mn, less than 0.0012% P, less than 0.003% S, 0.20-0.50% Cu, 0.01-0.10% Al, 0.001-0.10% V, 0.01-0.05% Nb (2<=Ca%/S%<=10; C%+Si%/30+ Mn%/20+Cu%/20<=0.20%) and Fe, wherein the pure degree of non-metal inclusion is below 40*10-3%.
Description
Technical field
The present invention relates to a kind of extremely excellent pipe line steel tube steel of resistibility that breaks under the environment that contains moistening hydrogen sulfide.
Background technology
In recent years, in the transportation of crude oil, Sweet natural gas pipeline steel pipe utilize increasing, but the situation that contains hydrogen sulfide in crude oil and the Sweet natural gas is more, it is very high that the coexistence of the moisture of seawater or underground water etc. and hydrogen sulfide is then carried out the corrosive probability to the steel surface, becomes big problem owing to corrode the embrittlement of the material that causes.In the defective that steel generated under moistening hydrogen-sulfide environmental, hydrogen induced cracking and sulphide stress corrosion cracking (SSCC) are arranged, both are collectively referred to as hydrogen sulfide and break these here.
Hydrogen induced cracking is breaking of also can taking place under the state that does not have external stress, in the high strength material of oil well with steel pipe etc., still all can see in the low strength material of pipe line steel tube steel etc.This hydrogen sulfide breaks to generate on the surface of steel and swells and be known as bubble, but is not to swell so from the teeth outwards sometimes, but inner breaking propagate stagely, until form the tube wall direction run through break.
Sulphide stress corrosion cracking (SSCC) is, to use the high-intensity steel of steel pipe usually as oil well, stress and breaking of generating, even but as the low intensive steel of pipe line steel tube steel, owing to be welded on the general easy formation sclerotic tissue of part of affected by heat, have welding residual stress or welding flaw, then under the operating pressure of pipeline, become stress raiser, thereby sulfide corrosion is broken into for significant problem.
Pipeline steel pipe has under a lot of situations makes pipeline with electric-welded pipe by welding as the buried arc welded tube, if be used for the girth welding that pipeline engages when being included in pipeline laying, we can say that all pipeline steel pipes all form by welding.Therefore, employed pipe line steel tube steel not only will prevent hydrogen induced cracking under moistening hydrogen-sulfide environmental, also to seek to reduce comprise weld part sulfuration stress corrosion cracking in interior hydrogen sulfide disruptiveness, this is crucial.
In addition, when making the pipeline steel pipe material of anti-hydrogen sulfide disruptiveness, be necessary envrionment conditions is considered fully.Always, to the evaluation of the hydrogen sulfide disruptiveness of material, normally carry out soak test in the saturated artificial seawater solution of hydrogen sulfide, its condition is that pH value is usually in 4.5～5.5 scope.But the environment for use of the reality of pipeline steel pipe is varied, is not limited in as above-mentioned comparison demulcent environment.Therefore, in the exploitation of the pipeline steel pipe material of anti-hydrogen sulfide disruptiveness excellence, be necessary to consider more exacting terms.
According to research always, non-metallic inclusion in hydrogen induced cracking and the steel and composition elements segregation have relation closely, and this is known well by everybody.That is, hydrogen induced cracking particularly easily with through rolling and sulfide-based inclusion (manganese sulfide etc.) that stretch be dot generation, also has because the small segregation of manganese, phosphorus makes abnormal structure's existence the rising of hydrogen induced cracking susceptibility.
Therefore, in order to reduce the sulfide-based inclusion that becomes the starting point of breaking, used the method that reduces the sulfur content in the steel, but only this can not prevent the hydrogen induced cracking for the dense segregation position of the inclusiones such as contrary V segregation with large-scale steel ingot fully.
In addition, recently, motion has, the shape of the rare earth element control inclusion by adding actinium etc. and the content that reduces inclusion by this shape control and the combined method that reduces oxygen level in the steel.But the proportion of the rare earth element of this method is bigger, is difficult to carry out floating of inclusion during molten steel solidification and removes, and has the caused comparison difficulty of breaking so prevent inclusion intensive of precipitation crystal grain portion of the bottom of large-scale steel ingot.In addition, the heavy addition of rare earth element, the problem on the industrial production of the spray nozzle clogging in the time of how can causing casting easily etc.Also have as the controlled chilling speed after long-time all thermal treatment of the high temperature before the hot rolling of abnormal structure's countermeasure or the hot rolling etc. and known well, but so miscellaneous operation also is difficult to arrive effect of sufficient by everybody.In addition, the restriction of manganese, phosphorus is also had effectiveness, but only this can not bring into play the effect that prevents to hydrogen induced cracking fully, it is effective to the intrusion that suppresses the hydrogen in the steel to add copper, but effect is also insufficient under rigorous environment.
On the other hand, for the sulfide stress rupture, the method that the high strength material is reduced its hardness is effective, and regulation has the restriction of Rockwell hardness HRC≤22 grades, can not prevent breaking under the severe rugged environment fully but only reduce hardness.
Summary of the invention
Present inventors in view of above-mentioned present situation, have carried out various researchs to the exploitation that hydrogen sulfide disruptive pipe line steel tube steel can not take place yet under severe condition, drawn following understanding.
That is, in preventing hydrogen induced cracking, the content by restriction manganese and phosphorus limits sulphur content in addition and adds calcium according to sulphur content in specified range, and the amount of the non-metallic inclusion in the restriction steel, even also can prevent hydrogen induced cracking fully under severe rugged environment.At this moment, in common operation for abnormal structure can not be formed, so be necessary the content of manganese and phosphorus is limited.Calcium is effective to the shape of the inclusion in the control steel, considers and the relation of sulfur content that the suitableeest scope that contains is arranged, and in order to bring into play effect of the present invention, is necessary sulphur is carried out the restriction of low levels in addition.Also have the proportion of sulfurated lime little, float easily easily during molten steel solidification and remove, can prevent that rare earth element from handling the intensive existence of inclusion of the steel ingot bottom settlings crystal grain portion of steel.In addition, in the preventing of hydrogen induced cracking, the cleanliness factor of restriction non-metallic inclusion is very important.Then, above-mentioned each key element is mixed its excellent effect of use performance.
Also have in the sulphide stress corrosion cracking (SSCC) that prevents weld part, reduce welding residual stress and reduce the countermeasure that welding such as welding flaw implements very important, if but can provide the material of anti-sulphide stress corrosion cracking (SSCC) excellence on a kind of material then very high in industrial value.Always, raising is understood as yet as the countermeasure of the anti-sulphide stress corrosion cracking (SSCC) of the low strength material of pipeline steel pipe with material, is difficult to prevent fully the sulphide stress corrosion cracking (SSCC) of weld part with current technology.Therefore present inventors have also carried out the discussion of system to this, its result on the basis of the countermeasure of above-mentioned hydrogen induced cracking, has drawn following experience, promptly limit carbon, silicon, manganese and the chromium that is added as required, molybdenum in the steel, the method for nickel in specified range is very effective.
In addition, in recent years for pipeline steel pipe at a low price is provided, large-scale steel ingot that many used thicknesses 400mm is above and continuous casting steel billet, generate the trickle segregation of inclusion and composition element in these materials easily, if want to pay the whole excellent anti-hydrogen sulfide disruptiveness of pipeline steel pipe, then be necessary to avoid these segregations.
The present invention according to above understanding, provides a kind of hydrogen sulfide disruptive pipe line steel tube steel that can prevent fully under rigorous environment.
That is, the present invention has following feature.
(1) a kind of pipe line steel tube steel of anti-hydrogen sulfide disruptiveness excellence, it is characterized in that, by weight percentage, containing C:0.02～0.15%, Si:0.01～0.50%, Mn:0.50～1.20%, below the P:0.012%, below the S:0.003%, Cu:0.20～0.50%, on the basis of Al:0.01～0.10%, also contain V:0.01～0.10%, in Nb:0.01～0.05% one or both, Ca is in the scope of 2≤Ca%/S%≤10, and satisfy C%+Si%/30+Mn%/20+Cu%/20≤0.20%, surplus is made of Fe in fact, and the cleanliness of non-metallic inclusion is below 40 * 10-3%.
(2) according to the pipe line steel tube steel of above-mentioned (1) described anti-hydrogen sulfide disruptiveness excellence, it is characterized in that, also contain in Cr:0.01～0.50%, Mo:0.01～0.50% one or both.
(3) according to the pipe line steel tube steel of above-mentioned (a 1) described anti-hydrogen sulfide disruptiveness excellence, it is characterized in that, also contain Ni:0.01～0.10%.
(4) according to the pipe line steel tube steel of above-mentioned (a 2) described anti-hydrogen sulfide disruptiveness excellence, it is characterized in that, also contain Ni:0.01～0.10%.
Steel of the present invention is that raw-material pipeline steel pipe material is the most effective for the thickness of generation segregation easy to manufacture large-scale steel ingot or continuous casting steel billet more than 400mm, and a kind of pipeline steel pipe material of anti-hydrogen sulfide disruptiveness excellence of low price can be provided.Also have, the present invention can directly use after finish rolling, also can handle through Q-tempering as required, perhaps uses after the normalizing treatment.
Description of drawings
Fig. 1 is illustrated in that (% represents weight percent with C:0.14%, below identical), Si:0.25%, Mn:0.65%, P:0.008%, Cu:0.30%, Al:0.03%, Nb:0.025% be essentially consist, in the steel of the scope of S:0.001～0.003%, 0.5≤Ca/S≤12, hydrogen induced cracking is subjected to the chart of influence of the content ratio of Ca and S.
It is essentially consist that Fig. 2 is illustrated in C:0.03%, Si:0.25%, Mn:1.15%, P:0.008%, Cu:0.30%, Al:0.03%, Nb:0.025%, V:0.035%, in the steel of the scope of S:0.0001～0.003%, 3≤Ca/S≤7, hydrogen induced cracking is subjected to the chart of the influence of non-metallic inclusion.
It is essentially consist that Fig. 3 is illustrated in Si:0.25%, P:0.008%, S:0.001%, Cu:0.30%, Cr:0.30%, Mo:0.10%, Ni:0.08%, Al:0.03%, Nb:0.025%, Ca/S=3, in the steel of C:0.06～0.14%, Mn:0.60～1.20% scope, the chart of the value of the C%+Si%/30+Mn% in the steel/20+Cu%/20+Cr%/20+Mo%/15+Ni%/60 and the relation of load stress/yielding stress.
Fig. 4 represents to get the explanatory view of test film.
Fig. 5 is the test film got from weld part and the explanatory view of load device.
Embodiment
Chemical ingredients the reasons are as follows defined in the present invention.
C is lower than 0.02% can not obtain necessary strength, surpasses 0.15% toughness, weldability deterioration, and the hardness of weld part rises, the rising of sulfide corrosion cracking sensitivity, so C content is 0.02～0.15%.
Si is necessary as the reductor in when steel-making, and being lower than 0.01% does not have its effect, is necessary for more than 0.01%, worsens but surpass 0.50% toughness, so Si content is 0.01～0.50%.But its content is in having the scope of deoxidation effect, and it is low more good more to wish.
Mn is necessary for obtaining intensity, be lower than 0.50% and can not obtain necessary strength, surpass 1.20% and form the abnormal structure that produces owing to trickle dense segregation in large-scale steel ingot and the continuous casting material easily based on manganese and phosphorus, prevent that particularly the hydrogen induced cracking under the severe rugged environment from becoming difficult, also have hardness increase, the rising of sulfide corrosion cracking sensitivity of weld part, so the content of Mn is 0.05～1.20%.
Segregation easily takes place in P, promotes the generation of abnormal structure, thus low more good more, wish to be suppressed at below 0.012% in order to bring into play effect of the present invention.
S forms sulfide-based inclusion, and hydrogen induced cracking susceptibility is had very big influence, so wish to do one's utmost to reduce, wishes among the present invention to be suppressed at below 0.003%.
Al is necessary as reductor, is lower than 0.01% and can not obtains its effect, surpasses 0.10% its character is worsened, so Al content is 0.01～0.10%.
Ca is the shape effective elements to the control inclusion, it is insufficient that the value of Ca%/S% is lower than 2 its effects, so owing to remainingly have manganese sulfide can not prevent hydrogen induced cracking fully, also have surpass 10 since the sulfide of calcium and oxide compound with and the gathering of mixture make the susceptibility of hydrogen induced cracking raise (with reference to Fig. 1).
Cu is to gaining in strength and to reduce hydrogen induced cracking effective, and it is insufficient to be lower than 0.20% its effect, surpasses 0.50% weldability, hot workability worsens, so Cu content is 0.20～0.50%.
V, Nb are effective to obtaining the necessary strength grade, and being lower than 0.01% does not have its effect, also have that V surpasses 0.10%, Nb surpass 0.05% unfavorable economically, institute thinks and does not wish.
Cr is effective to improving intensity and anti-hydrogen induced cracking, and being lower than 0.01% does not have its effect, surpasses 0.50% toughness and worsens, and institute thinks and do not wish.
Mo gains in strength and toughness, and effective to improving erosion resistance simultaneously, being lower than 0.01% does not have its effect, surpasses 0.50% toughness and worsens, and institute thinks and do not wish.
So Ni wishes to contain on a small quantity to anti-hydrogen sulfide disruptiveness is harmful, when still containing copper, in order to prevent copper brittlenessization, makes it contain 0.01～0.10% scope.In this scope, can bad influence not arranged to the present invention.
Also have, N does not limit especially, but can break to anti-hydrogen sulfide bad influence is arranged, so wish to be suppressed at below the 10ppm, preferably is suppressed at below the 40ppm.
To satisfy C%+Si%/30+Mn%/20+Cu%/20≤0.20% as condition, be to break for the sulphur corrosion that prevents weld part, as shown in Figure 3, surpass 0.20% and can not prevent fully that sulphur corrosion from breaking.Surpassing 0.20% is associated with the tissue of welding heat affected zone and is prone to the big martensite of sulphur corrosion cracking sensitivity, bainite structure.
The cleanliness of non-metallic inclusion is 40 * 10
-3Below the %, be, surpass 40 * 10 because as shown in Figure 2
-3% then can not prevent the hydrogen induced cracking under the severe condition.
Below, describe with regard to embodiments of the invention.
The large-scale steel ingot of the chemical ingredients of expression or continuous casting steel billet have been made steel pipe and plate from table 1.
From above-mentioned each steel, as shown in Figure 4, take test film along the rolling direction of plate and steel pipe, in the saturated following solution of hydrogen sulfide, soak after 300 hours, whether exist breaking by UT (Ultrasonic Testing) and investigate, in addition, observe cutting off section with microscope, hydrogen induced cracking is judged.
A: the fresh water solution that artificial seawater or hydrogen sulfide are saturated (pH value 4.5～5.5)
B: make 0.5% acetic acid+in 5% sodium chloride solution saturated the solution of hydrogen sulfide (pH value 3.0～3.5), also have, test film is from the suitable position in top, middle part, the bottom of the steel ingot of steel ingot material, wide end, 1/4 position, 1/2 position (central part) of slave plate adds up to 9 places respectively to take 3, and wide end, 1/4 position, 1/2 position of plate of continuous casting material adds up to 3 places respectively to take 3 to test.Its result is shown in the table 2.
From The above results, when comparative steel is used in the B of condition harshness solution, big breaking all taken place basically, add that rare earth element carried out handling A steel, B steel can not prevent the hydrogen induced cracking under the severe rugged environment, but steel of the present invention does not all break, anti-hydrogen sulfide disruptiveness excellence.
Also have, from the test portion of taking from the weld, make one-tenth test film as shown in Figure 5, use load device shown in Figure 5, apply the yielding stress that is equivalent to steel and carry out in above-mentioned B solution, soaking after 200 hours after the load, test.Also have, the 9000kcal/cm the strictest with welding conditions tests.Its result is as shown in table 2, and steel of the present invention can prevent fully that sulfide corrosion from breaking.Thus, as shown in Figure 3, satisfy C%+Si%/30+Mn%/20+Cu%/20+Cr%/20+Mo%/15+Ni%/60≤0.20%, steel is limited in the soft district, the sulfide corrosion disruptive is prevented extremely effective.
Table 1 chemical ingredients (%)
| The steel grade class | C | Si | Mn | P | S | Cu | Al | Nb | V | Other | Ca/S | REM/S | X | |
| Comparative steel | A | 0.09 | 0.14 | 0.80 | 0.017 | 0.008 | 0.32 | 0.046 | 0.038 | - | Cr：0.43，Ni：0.06 | - | 3.4 | 0.173 |
| B | 0.12 | 0.28 | 1.35 | 0.020 | 0.005 | 0.29 | 0.036 | 0.029 | 0.038 | Mo：0.24，Ni：0.20 | - | 2.9 | 0.231 | |
| C | 0.11 | 0.25 | 1.56 | 0.021 | 0.004 | 0.30 | 0.044 | - | 0.042 | - | - | 4.3 | 0.211 | |
| D | 0.14 | 0.20 | 0.72 | 0.020 | 0.005 | 0.26 | 0.023 | 0.025 | - | Cr：0.35 | 2.5 | - | 0.213 | |
| E | 0.10 | 0.18 | 1.43 | 0.019 | 0.002 | 0.25 | 0.052 | 0.032 | - | Cr：0.35 | 3.1 | - | 0.208 | |
| F | 0.09 | 0.31 | 1.10 | 0.016 | 0.003 | 0.31 | 0.016 | - | 0.051 | - | 1.6 | - | 0.171 | |
| G | 0.10 | 0.24 | 0.96 | 0.021 | 0.001 | 0.33 | 0.031 | 0.028 | - | - | 11.4 | - | 0.173 | |
| Steel of the present invention | H | 0.08 | 0.30 | 1.17 | 0.011 | 0.003 | 0.25 | 0.014 | 0.024 | - | - | 3.1 | - | 0.161 |
| I | 0.09 | 0.24 | 1.15 | 0.006 | 0.001 | 0.33 | 0.042 | - | 0.08 | - | 3.2 | - | 0.172 | |
| J | 0.09 | 0.27 | 0.78 | 0.012 | 0.001 | 0.28 | 0.033 | 0.034 | 0.044 | - | 4.3 | - | 0.152 | |
| K | 0.10 | 0.16 | 0.98 | 0.009 | 0.001 | 0.27 | 0.043 | 0.035 | - | Cr：0.35 | 2.7 | - | 0.185 | |
| L | 0.12 | 0.20 | 0.75 | 0.010 | 0.002 | 0.30 | 0.035 | 0.027 | - | Mo：0.22 | 3.6 | - | 0.194 | |
| M | 0.07 | 0.12 | 1.18 | 0.008 | 0.001 | 0.31 | 0.056 | 0.026 | - | Cr：0.30，Mo：0.20 | 9.7 | - | 0.177 | |
| N | 0.09 | 0.18 | 1.05 | 0.010 | 0.002 | 0.32 | 0.040 | - | 0.060 | Ni：0.05 | 2.8 | - | 0.165 | |
| O | 0.07 | 0.31 | 1.08 | 0.008 | 0.001 | 0.29 | 0.033 | 0.026 | - | Cr：0.35，Ni：.0.08 | 2.8 | - | 0.168 | |
| P | 0.08 | 0.27 | 1.12 | 0.009 | 0.001 | 0.28 | 0.038 | 0.034 | - | Mo：0.18，Ni：0.07 | 3.5 | - | 0.172 | |
| Q | 0.06 | 0.22 | 0.98 | 0.007 | 0.001 | 0.30 | 0.029 | 0.027 | - | Cr：0.25，Mo：0.15，Ni：0.0 | 3.3 | - | 0.155 | |
X is C%+Si%/30+Mn%/20+Cu%/20+Cr%/20+Mo%/15+Ni%/60
Table 2 test-results
| The steel grade class | Hydrogen induced cracking is estimated | The sulfide corrosion evaluation of breaking | Non-metallic inclusion cleanliness (* 10 -3％) | ||
| A solution | B solution | B solution | |||
| Comparative steel | A | ○ | △ | △ | 62 |
| B | ○ | × | × | 83 | |
| C | △ | × | × | 75 | |
| D | ○ | × | × | 83 | |
| E | ○ | △ | × | 29 | |
| F | ○ | × | ○ | 68 | |
| G | ○ | △ | △ | 52 | |
| Steel of the present invention | H | ○ | ○ | ○ | 35 |
| I | ○ | ○ | ○ | 21 | |
| J | ○ | ○ | ○ | 11 | |
| K | ○ | ○ | ○ | 14 | |
| L | ○ | ○ | ○ | 19 | |
| M | ○ | ○ | ○ | 18 | |
| N | ○ | ○ | ○ | 24 | |
| O | ○ | ○ | ○ | 18 | |
| P | ○ | ○ | ○ | 17 | |
| Q | ○ | ○ | ○ | 25 | |
Break and estimate, zero for not having, and △ is little for breaking, * for breaking greatly
Claims (4)
1. the pipe line steel tube steel of an anti-hydrogen sulfide disruptiveness excellence, it is characterized in that, by weight percentage, containing C:0.02～0.15%, Si:0.01～0.50%, Mn:0.50～1.20%, below the P:0.012%, below the S:0.003%, Cu:0.20～0.50%, on the basis of Al:0.01～0.10%, also contain V:0.01～0.10%, in Nb:0.01～0.05% one or both, Ca is in the scope of 2≤Ca%/S%≤10, and satisfy C%+Si%/30+Mn%/20+Cu%/20≤0.20%, surplus is made of Fe in fact, and the cleanliness of non-metallic inclusion is 40 * 10
-3Below the %.
2. the pipe line steel tube steel of an anti-hydrogen sulfide disruptiveness excellence, it is characterized in that, by weight percentage, containing C:0.02～0.15%, Si:0.01～0.50%, Mn:0.50～1.20%, below the P:0.012%, below the S:0.003%, Cu:0.20～0.50%, on the basis of Al:0.01～0.10%, also contain V:0.01～0.10%, in Nb:0.01～0.05% one or both, Ca is in the scope of 2≤Ca%/S%≤10, in addition, also contain Cr:0.01～0.50%, in Mo:0.01～0.50% one or both, and satisfy C%+Si%/30+Mn%/20+Cu%/20+Cr%/20+Mo%/15≤0.20%, surplus is made of Fe in fact, and the cleanliness of non-metallic inclusion is 40 * 10
-3Below the %.
3. the pipe line steel tube steel of an anti-hydrogen sulfide disruptiveness excellence, it is characterized in that, by weight percentage, containing C:0.02～0.15%, Si:0.01～0.50%, Mn:0.50～1.20%, below the P:0.012%, below the S:0.003%, Cu:0.20～0.50%, on the basis of Al:0.01～0.10%, also contain V:0.01～0.10%, in Nb:0.01～0.05% one or both, Ca is in the scope of 2≤Ca%/S%≤10, in addition, also contain Ni:0.01～0.10%, and satisfy C%+Si%/30+Mn%/20+Cu%/20+Ni%/60≤0.20%, surplus is made of Fe in fact, and the cleanliness of non-metallic inclusion is 40 * 10
-3Below the %.
4. the pipe line steel tube steel of an anti-hydrogen sulfide disruptiveness excellence, it is characterized in that, by weight percentage, containing C:0.02～0.15%, Si:0.01～0.50%, Mn:0.50～1.20%, below the P:0.012%, below the S:0.003%, Cu:0.20～0.50%, on the basis of Al:0.01～0.10%, also contain V:0.01～0.10%, in Nb:0.01～0.05% one or both, and Cr:0.01～0.50%, in Mo:0.01～0.50% one or both, Ca is in the scope of 2≤Ca%/S%≤10, in addition, also contain, Ni:0.01～0.10%, and satisfy C%+Si%/30+Mn%/20+Cu%/30+Cr%/20+Mo%/15+Ni%/60≤0.20%, surplus is made of Fe in fact, and the cleanliness of non-metallic inclusion is 40 * 10
-3Below the %.
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| CN 200510099019 CN1924066A (en) | 2005-08-31 | 2005-08-31 | Steel for pipeline steel tube with excellent hydrogen sulfide breakage resistance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110088344A (en) * | 2016-12-23 | 2019-08-02 | 株式会社Posco | Steels for pressure vessel use and its manufacturing method with excellent hydrogen-induced cracking resistance |
| CN110373520A (en) * | 2019-07-23 | 2019-10-25 | 衡阳华菱钢管有限公司 | The heat treatment method of steel pipe |
-
2005
- 2005-08-31 CN CN 200510099019 patent/CN1924066A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110088344A (en) * | 2016-12-23 | 2019-08-02 | 株式会社Posco | Steels for pressure vessel use and its manufacturing method with excellent hydrogen-induced cracking resistance |
| CN110088344B (en) * | 2016-12-23 | 2021-04-30 | 株式会社Posco | Steel for pressure vessel having excellent hydrogen-induced cracking resistance and method for producing same |
| US11578376B2 (en) | 2016-12-23 | 2023-02-14 | Posco Co., Ltd | Steel for pressure vessels having excellent resistance to hydrogen induced cracking and manufacturing method thereof |
| CN110373520A (en) * | 2019-07-23 | 2019-10-25 | 衡阳华菱钢管有限公司 | The heat treatment method of steel pipe |
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