CN107805755A - A kind of low temperature thick walled steel tube and preparation method thereof - Google Patents
A kind of low temperature thick walled steel tube and preparation method thereof Download PDFInfo
- Publication number
- CN107805755A CN107805755A CN201610815319.9A CN201610815319A CN107805755A CN 107805755 A CN107805755 A CN 107805755A CN 201610815319 A CN201610815319 A CN 201610815319A CN 107805755 A CN107805755 A CN 107805755A
- Authority
- CN
- China
- Prior art keywords
- steel pipe
- low temperature
- steel tube
- thick walled
- classes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention provides a kind of low temperature thick walled steel tube and preparation method thereof, and on the basis of the weight of the steel pipe, the steel pipe contains the following chemical composition of percentage：C：≤ 0.12%, Si：0.15~0.50%, Mn：1.20~1.55%, S：≤ 0.010%, P：≤ 0.015%, Ni：0.30~0.85%, V：≤ 0.05%, Nb：≤ 0.04%, Als：0.015~0.080%, [N]≤60ppm, [O]≤20ppm, [H]≤2ppm, remaining is Fe and inevitable impurity, wherein, the content of each component is not 0.The low temperature of the present invention is good with thick walled steel tube resistance to low temperature, has higher toughness in 70 DEG C of temperatures above.
Description
Technical field
The present invention relates to the pressure vessel applied to petrochemical industry, coal chemical industry etc. and pressure pipeline field, and in particular to one
Kind low temperature thick walled steel tube and preparation method thereof.
Background technology
As the country is increasing to the demand of clean energy resource, the device of oil refining, chemical industry, coal chemical industry, coal gas and LNG
Largely start.A feature all be present in these devices：Worst cold case.Wherein, there is a kind of operating mode largely to use, i.e., -70 DEG C.But mesh
The preceding higher thick-walled pipe of intensity for lacking -70 DEG C of ranks, specifically, the high-strength thick-walled of -70 DEG C of ranks is just a lack of, to work
Journey designs and equipment manufacturing causes difficulty.
Current material is enabled for -70 DEG C, also because intensity is relatively low, causes thickness larger, meanwhile, as thick-walled pipe is straight
Footpath is increasing, in order to reduce wall thickness as far as possible, for this rank material on the premise of low-temperature impact work is improved, as far as possible
It is also the problem of considering, to reduce manufacture difficulty and cost to improve intensity.Therefore, the high-strength of -70 DEG C of ranks of exploitation is needed badly
Spend thick-walled pipe.
The content of the invention
In order to solve the above-mentioned problems in the prior art, the invention provides a kind of low temperature thick walled steel tube and its system
Preparation Method.The resistance to low temperature of the thick walled steel tube is good, has higher toughness and intensity in -70 DEG C of temperatures above.
According to the first aspect of the invention, the invention provides a kind of low temperature thick walled steel tube, using the weight of the steel pipe as
Benchmark, the steel pipe contain the following chemical composition of percentage：C：≤ 0.12%, Si：0.15~0.50%, Mn：
1.20~1.55%, S：≤ 0.010%, P：≤ 0.015%, Ni：0.30~0.85%, V：≤ 0.05%, Nb：≤ 0.04%,
Als：0.015~0.080%, [N]≤60ppm, [O]≤20ppm, [H]≤2ppm, remaining is Fe and inevitable impurity,
Wherein, the content of each component is not 0.
According to the second aspect of the invention, should the invention provides a kind of preparation method of the low temperature thick walled steel tube
Preparation method comprises the following steps：
1) refining of steel：Raw material is smelted, then carries out external refining, finally carries out application of vacuum；
2) steel pipe forming：Pipe is manufactured by continuous casting or the method for molding, then using rolling or forging molding；
3) it is heat-treated：The condition of delivery of shaping steel tube is normalizing or normalizing+tempering.
The performance of the low temperature thick walled steel tube of the present invention is as follows：Room-temperature mechanical property includes：The yield strength of the steel pipe
≥350MPa；Tensile strength is 500~610MPa；Longitudinal extending rate A50mm>=35%；As diameter of phi >=76mm of the steel pipe,
And during wall thickness >=14mm, impact absorbing energy KV2 >=53J of the steel pipe at -70 DEG C.
Embodiment
To make the present invention easier to understand, the present invention is described in detail below in conjunction with embodiment, these embodiments are only
Serve illustrative, be not intended to limit the invention.
According to the first aspect of the invention, the invention provides a kind of low temperature thick walled steel tube, using the weight of the steel pipe as
Benchmark, the steel pipe contain the following chemical composition of percentage：C：≤ 0.12%, Si：0.15~0.50%, Mn：
1.20~1.55%, S：≤ 0.010%, P：≤ 0.015%, Ni：0.30~0.85%, V：≤ 0.05%, Nb：≤ 0.04%,
Als：0.015~0.080%, [N]≤60ppm, [O]≤20ppm, [H]≤2ppm, remaining is Fe and inevitable impurity,
Wherein, the content of each component is not 0.
Preferably, low temperature thick walled steel tube of the invention, on the basis of the weight of the steel pipe, the steel pipe contains by weight
The following chemical composition of percentage meter：C：≤ 0.10%, Si：0.20~0.40%, Mn：1.30~1.55%, S：≤
0.005%, P：≤ 0.010%, Ni：0.45~0.85%, V：≤ 0.04%, Nb：≤ 0.03%, Als：0.025~
0.063%, [N]≤50ppm, [O]≤15ppm, [H]≤1.5ppm, remaining is Fe and inevitable impurity, wherein, each group
The content divided is not 0.
According to the present invention, the effect of main chemical compositions is as follows in the low temperature thick walled steel tube：
C：Carbon can be dissolved by gap and improve hardness of steel, be the maximally effective element of reinforced structure steel, and be also most to pass through
The element of Ji, but carbon has detrimental effect to toughness, plasticity, weldability etc., therefore the obdurability based on steel, weldability etc. are each
The matching of performance, the present invention control C content≤0.12wt%, preferably C content≤0.10wt%.
Si：Silicon plays deoxidation in steel, also there is certain solid solution strengthening effect, silicon in addition to it can suppress manganese segregation,
The Grain Boundary Segregation of phosphorus can also be suppressed, but silicone content is too high in steel steel fragility is occurred, in order to ensure toughness, Si of the invention
Content control between 0.15wt%~0.50wt%, preferably Si content is 0.20wt%~0.40wt%.
Mn：Manganese is among the austenite stabilizing elements, while is also matrix strengthening element, can be improved by precipitation strength strong
Degree, manganese can also improve the quenching degree of material, too low, and intensity does not reach requirement, the too high toughness for then influenceing material, and silicon
It is present in certain proportion in steel with manganese, also helps suppression segregation each other, therefore, Mn content is controlled in 1.20wt%
In the range of~1.55wt%, preferably Mn content is 1.30wt%~1.55wt%.
S、P：Belong to impurity element in steel, content should be reduced as far as possible.Sulphur easily forms precipitate sulphur with metallic element manganese
Change manganese, reduce low-temperature flexibility, S content is controlled in below 0.010wt%, preferably S content≤0.005wt%；Phosphorus easily exists
Grain Boundary Segregation, crystal boundary resistance to crack extension ability is reduced, reduce low-temperature flexibility, it is excellent by the control of P content in below 0.015wt%
Select P content≤0.010wt%.
Ni：Nickel is non-carbide former, the effect of solution strengthening is primarily served in steel, especially to material low
Stability under temperature is most important, is reduction ductile-brittle transition temperature element best in metallic element, is advantageous to improve material
Quenching degree and intensity, while the cold plasticity of material can also be improved, for economics, it is by Ni content control
0.30wt%~0.85wt%, preferably Ni content are 0.45wt%~0.85wt%.
V：Vanadium dramatically increases the reheat cracking susceptibility of steel pipe, while the reciprocation between the niobium in steel, plays niobium vanadium
The effect of complex intensifying, so as to compensate for the decline situation of the steel strength caused by carbon content decline in steel, limit containing for V
Content≤0.04wt% of amount≤0.05wt%, preferably V.
Nb：The carboritride strain induced precipitate of niobium plays precipitation enhancement, while prevents brilliant in hot procedure
Grain is grown up.If its content is higher, continuous casting steel billet easily splits, and influences the lumber recovery of steel pipe, present invention control Nb content≤
0.04wt%, preferably Nb content≤0.03wt%.
Als：Dissolved aluminum has the function that crystal grain thinning, in order to reduce the oxygen content in steel in steel-smelting production process, commonly uses
The deoxidation materials such as aluminium, barium, calcium, silicon, manganese (or its composite alloy) react into oxide clinker with oxygen and float to molten steel upper strata
And the oxygen content in steel is reduced, wherein aluminium is excellent deoxidier, and aluminium easily reacts generation Al with oxygen2O3(very small amount aluminium nitride), together
When there is part pure aluminum to dissolve in steel, this part pure aluminum can by acid dissolving be referred to as dissolved aluminum, the present invention control Als content exist
0.015wt%~0.080wt%, preferably Als content are 0.025wt%~0.063wt%.
[N]、[O]、[H]：Nitrogen, oxygen and aluminium easily form high-melting-point precipitate aluminium nitride and aluminum oxide, and precipitate is straight
Footpath is larger, easily causes stress concentration near precipitate and turns into formation of crack, has a strong impact on the low-temperature flexibility of matrix, the present invention
Content≤the 60ppm, preferably [N] of control [N] content≤50ppm, the preferably content≤20ppm of [O], the content of [O]≤
15ppm, the content of hydrogen also should be controlled strictly, be allowed to be in alap level, and the content of present invention control [H]≤
2ppm, preferably [H] content≤1.5ppm.
According to the present invention, each component in above-mentioned preferred scope can further improve low temperature thick walled steel tube at room temperature
Yield strength, tensile strength and Longitudinal extending rate；And impact absorbing energy of the steel pipe at -70 DEG C.
According to the present invention, the prior austenite grain size of the low temperature thick walled steel tube can be 7 grades or thinner.
According to low temperature thick walled steel tube of the present invention, by the B methods in GB/T10561 as assessment method, the steel
A classes, B classes, C classes, D classes and the DS type impurities that pipe contains generally are not more than 0.5 grade；Wherein, A classes, B classes, C classes and D classes folder
Thick, the thin serial sum of debris is generally not more than 1.5 grades.
Wherein, the concept of A classes, B classes, C classes, D classes and DS type impurities is known to those skilled in the art.Refer specifically to
It is：A classes are sulfide, and B classes are aluminum oxide, and C classes are silicate, and D classes are spherical oxide, and DS classes are that individual particle is spherical.
According to the present invention, the room-temperature mechanical property of the low temperature thick walled steel tube includes：Yield strength (Rel)≥350MPa；
Tensile strength (Rm) it is 500~610MPa；Longitudinal extending rate A50mm>=35%.
According to the present invention, as diameter of phi >=76mm of the steel pipe, and during wall thickness >=14mm, the steel pipe is at -70 DEG C
Impact absorbing energy KV2 >=53J.
According to the second aspect of the invention, should the invention provides a kind of preparation method of the low temperature thick walled steel tube
Preparation method comprises the following steps：
1) refining of steel：Raw material is smelted, then carries out external refining, finally carries out application of vacuum；
2) steel pipe forming：Pipe is manufactured by continuous casting or the method for molding, then using rolling or forging molding；
3) it is heat-treated：The condition of delivery of shaping steel tube is normalizing or normalizing+tempering.
Normally, in step 1), the raw material is smelted using electric arc furnaces or oxygen coverter, with specific reference to the kind of raw material
Class selects.
In step 2), the rolling is hot rolling or cold rolling.
In step 3), the described condition of delivery includes：During thickness of steel pipe S ＞ 14mm, using normalizing+tempering, the temperature of normalizing
Spend for 900~960 DEG C, the temperature of tempering is 620~670 DEG C, is accelerated after the steel pipe normalizing with 2~20 DEG C/s cooling velocity
Cooling.
External refining and application of vacuum of the present invention can be carried out by this area common process and equipment.
Below will the present invention will be described in detail by embodiment and comparative example.
Embodiment 1
A kind of low temperature thick walled steel tube, specification are Φ 325 × 15, and the preparation method of the steel pipe comprises the following steps：
1) refining of steel：Raw material is smelted using electric arc furnaces, then carries out LF external refinings, finally carries out VD vacuum and takes off
Gas；
2) steel pipe forming：Pipe is manufactured by continuous casting process, then using hot-roll forming, the chemical composition such as table of the steel pipe
Shown in 1；
3) it is heat-treated：The condition of delivery of shaping steel tube is the phase transition temperature Ac1 of normalizing or normalizing+tempering, after measured steel pipe
For 714 DEG C, Ac3 is 848 DEG C, and normalizing temperature selects 900 DEG C, and temperature selects 630 DEG C, with 5 DEG C/s after the steel pipe normalizing
Cooling velocity accelerate cooling.
Embodiment 2
Embodiment with embodiment 1, wherein, be made steel pipe chemical composition it is as shown in table 1, normalizing temperature select 910 DEG C,
Temperature selects 620 DEG C.
Embodiment 3
Embodiment with embodiment 1, wherein, be made steel pipe chemical composition it is as shown in table 1, normalizing temperature select 930 DEG C,
Temperature selects 640 DEG C.
Embodiment 4
Embodiment with embodiment 1, wherein, be made steel pipe chemical composition it is as shown in table 1, normalizing temperature select 950 DEG C,
Temperature selects 660 DEG C.
Comparative example 1
Embodiment is with embodiment 1, and difference is, the chemical composition of obtained steel pipe is as shown in table 1.
The chemical composition of steel pipe is as shown in table 1 made from above-described embodiment and comparative example.
Table 1
Embodiment and the room-temperature mechanical property of steel pipe and prior austenite grain size made from comparative example are as shown in table 2.
Table 2
* tensile sample is longitudinal direction.
Chemical composition, room-temperature mechanical property and the grain size number evidence of steel pipe obtained by embodiment in Tables 1 and 2 and comparative example
Understand, low temperature of the invention has >=350MPa yield strength, tensile strength >=520MPa, room temperature elongation percentage with thick walled steel tube
A50mm>=35%, it is superior to comparative example.
The prior austenite grain size that method according to GB/T6394 determines embodiment steel pipe is 7 grades or thinner.
In addition, measure inclusion content in each steel pipe according to B methods in GB/T10561, wherein, A classes, B classes, C classes, D classes and
DS type impurities are no more than 0.5 grade；Wherein, thick, the thin serial sum of A classes, B classes, C classes and D type impurities is no more than 1.0
Level.
Carry out Charpy (v-notch) Impulse Test Result for the steel pipe that embodiment is prepared with comparative example is as shown in table 3.
Table 3
* impact specimen is laterally, shown KV2 values is the average value of three samples.
As shown in Table 3, steel pipe of the invention has higher toughness under cryogenic, disclosure satisfy that the need of practical application
Will, at -70 DEG C, impact absorbing energy KV2 >=53J of steel pipe of the invention, better than comparative example.
It is described above embodiments of the invention, described above is exemplary, and non-exclusive, and also not
It is limited to disclosed embodiment.In the case of the scope and spirit without departing from illustrated embodiment, for the art
Many modifications and changes will be apparent from for those of ordinary skill.
Claims (10)
1. a kind of low temperature thick walled steel tube, it is characterised in that on the basis of the weight of the steel pipe, the steel pipe contains by weight hundred
The following chemical composition of fraction meter：C：≤ 0.12%, Si：0.15~0.50%, Mn：1.20~1.55%, S：≤ 0.010%,
P：≤ 0.015%, Ni：0.30~0.85%, V：≤ 0.05%, Nb：≤ 0.04%, Als：0.015~0.080%, [N]≤
60ppm, [O]≤20ppm, [H]≤2ppm, remaining is Fe and inevitable impurity, wherein, the content of each component is not 0.
2. low temperature thick walled steel tube as claimed in claim 1, wherein, on the basis of the weight of the steel pipe, the steel pipe contains
The following chemical composition of percentage：C：≤ 0.10%, Si：
0.20~0.40%, Mn：1.30~1.55%, S：≤ 0.005%, P：≤ 0.010%, Ni：0.45~0.85%, V：≤
0.04%, Nb：≤ 0.03%, Als：0.025~0.063%, [N]≤50ppm, [O]≤15ppm, [H]≤1.5ppm, remaining
For Fe and inevitable impurity, wherein, the content of each component is not 0.
3. low temperature thick walled steel tube as claimed in claim 1 or 2, wherein, the prior austenite grain size of the steel pipe is for 7 grades or more
Carefully.
4. low temperature thick walled steel tube as claimed in claim 1 or 2, wherein, A classes that the steel pipe contains, B classes, C classes, D classes and
DS type impurities are no more than 0.5 grade；Wherein, thick, the thin serial sum of A classes, B classes, C classes and D type impurities is no more than 1.5
Level.
5. low temperature thick walled steel tube as claimed in claim 1, wherein, the room-temperature mechanical property of the steel pipe includes：Surrender is strong
Degree >=350MPa；Tensile strength is 500~610MPa；Longitudinal extending rate A50mm>=35%.
6. low temperature thick walled steel tube as claimed in claim 1, wherein, as diameter of phi >=76mm of the steel pipe, and wall thickness >=
During 14mm, impact absorbing energy KV2 >=53J of the steel pipe at -70 DEG C.
7. the preparation method of the low temperature thick walled steel tube in a kind of claim 1~6 described in any one, it is characterised in that should
Preparation method comprises the following steps：
1) refining of steel：Raw material is smelted, then carries out external refining, finally carries out application of vacuum；
2) steel pipe forming：Pipe is manufactured by continuous casting or the method for molding, then using rolling or forging molding；
3) it is heat-treated：The condition of delivery of shaping steel tube is normalizing or normalizing+tempering.
8. the preparation method of low temperature thick walled steel tube as claimed in claim 7, wherein, in step 1), the raw material is using electricity
Arc stove or oxygen coverter are smelted.
9. the preparation method of low temperature thick walled steel tube as claimed in claim 7, wherein, in step 2), the rolling is hot rolling
Or cold rolling.
10. the preparation method of low temperature thick walled steel tube as claimed in claim 7, wherein, in step 3), the described condition of delivery
Including：During thickness of steel pipe S ＞ 14mm, using normalizing+tempering, the temperature of normalizing is 900~960 DEG C, the temperature of tempering for 620~
670 DEG C, cooling is accelerated with 2~20 DEG C/s cooling velocity after the steel pipe normalizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610815319.9A CN107805755A (en) | 2016-09-09 | 2016-09-09 | A kind of low temperature thick walled steel tube and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610815319.9A CN107805755A (en) | 2016-09-09 | 2016-09-09 | A kind of low temperature thick walled steel tube and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107805755A true CN107805755A (en) | 2018-03-16 |
Family
ID=61569726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610815319.9A Pending CN107805755A (en) | 2016-09-09 | 2016-09-09 | A kind of low temperature thick walled steel tube and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107805755A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113061811A (en) * | 2021-03-17 | 2021-07-02 | 攀钢集团江油长城特殊钢有限公司 | LNG (liquefied Natural gas) marine structural steel and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101864536A (en) * | 2010-04-28 | 2010-10-20 | 南京钢铁股份有限公司 | Q 390E class super-thick steel plate with thickness of 100mm and manufacturing method thereof |
| CN105925893A (en) * | 2016-06-23 | 2016-09-07 | 江阴兴澄特种钢铁有限公司 | S355NL low-carbon high-toughness low alloy steel plate of 250 mm thickness and manufacturing method thereof |
-
2016
- 2016-09-09 CN CN201610815319.9A patent/CN107805755A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101864536A (en) * | 2010-04-28 | 2010-10-20 | 南京钢铁股份有限公司 | Q 390E class super-thick steel plate with thickness of 100mm and manufacturing method thereof |
| CN105925893A (en) * | 2016-06-23 | 2016-09-07 | 江阴兴澄特种钢铁有限公司 | S355NL low-carbon high-toughness low alloy steel plate of 250 mm thickness and manufacturing method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 中国焊接协会: "《锅炉压力容器焊接实用手册》", 30 June 2016, 机械工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113061811A (en) * | 2021-03-17 | 2021-07-02 | 攀钢集团江油长城特殊钢有限公司 | LNG (liquefied Natural gas) marine structural steel and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10760149B2 (en) | Highly corrosion-resistant, high strength, A1-containing weathering steel plate and process of manufacturing same | |
| RU2627826C2 (en) | Wear-resistant sheet steel with excellent low-temperature impact strength and resistance to hydrogen attack and method of its manufacture | |
| JP5131794B2 (en) | High-strength austenitic stainless steel for high-pressure hydrogen gas | |
| JP5657026B2 (en) | High-strength steel sheet with excellent post-weld heat treatment resistance and manufacturing method thereof | |
| CN107805759A (en) | A kind of low temperature pressure vessel steel plate and preparation method thereof | |
| WO2005017222A1 (en) | High strength stainless steel pipe excellent in corrosion resistance for use in oil well and method for production thereof | |
| JP6139479B2 (en) | High strength stainless steel pipe manufacturing method and high strength stainless steel pipe | |
| WO2009004741A1 (en) | Martensitic stainless-steel seamless pipe for oil well pipe and process for producing the same | |
| WO2005007915A1 (en) | Martensitic stainless steel | |
| EP2885440A1 (en) | High-chromium heat-resistant steel | |
| EP2889390B1 (en) | Highly strong, highly tough and highly corrosion-resistant martensitic stainless steel | |
| CN106498287B (en) | A kind of CT90 grades of connecting pipes hot rolled strip and its production method | |
| JP5499575B2 (en) | Martensitic stainless steel seamless pipe for oil well pipe and method for producing the same | |
| CN102144041B (en) | Seamless pipe of martensitic stainless steel for oil well pipe and process for producing same | |
| JP4645307B2 (en) | Wear-resistant steel with excellent low-temperature toughness and method for producing the same | |
| CN112011735A (en) | Economical low-temperature steel pipe with good corrosion resistance and manufacturing method thereof | |
| CN107805756A (en) | A kind of cryogenic steel, low-temperature pressure container and steel for pipe pipe and preparation method thereof | |
| CN111961976A (en) | Steel, preparation method and application thereof | |
| CN107805755A (en) | A kind of low temperature thick walled steel tube and preparation method thereof | |
| CN107805757A (en) | A kind of low alloy steel and preparation method thereof | |
| CN106636958A (en) | Cu-containing pipeline steel and enhanced heat treatment process thereof | |
| JP7207557B2 (en) | Stainless seamless steel pipe for oil country tubular goods and manufacturing method thereof | |
| JP4645306B2 (en) | Wear-resistant steel with excellent low-temperature toughness and method for producing the same | |
| CN108103416A (en) | A kind of low-temperature pressure container two-phase steel forgings and preparation method thereof | |
| CN108103417A (en) | A kind of low-temperature pressure container dual phase steel steel pipe and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180316 |
|
| RJ01 | Rejection of invention patent application after publication |