CN111876665A - Low-cost, low-temperature-resistant and high-strength steel for deep-sea Christmas tree equipment connector and heat treatment process thereof - Google Patents
Low-cost, low-temperature-resistant and high-strength steel for deep-sea Christmas tree equipment connector and heat treatment process thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Abstract
The invention provides a low-cost, low-temperature-resistant and high-strength steel for deep sea Christmas tree equipment connectors and a heat treatment process thereof, wherein the steel comprises 0.13-0.15% of C, 0.20-0.28% of Si, 1.50-1.60% of Mn, 0.010% of trace P, 0.005% of trace S, 0.12-0.18% of Cr, 0.10-0.20% of Mo, 0.40-0.60% of Ni, 0.10-0.20% of V, 0.040-0.060% of Nb, 0.020-0.040% of Ti, 0.020-0.060% of Als and the balance of Fe and other inevitable impurities, and the yield strength of the obtained steel reaches the level of 550MPa and has good low-temperature impact toughness and welding performance.
Description
Technical Field
The invention belongs to the field of alloys, relates to the technical field of steel for deep sea Christmas tree equipment connectors, and particularly relates to low-cost, low-temperature-resistant and high-strength steel for deep sea Christmas tree equipment connectors and a heat treatment process thereof.
Background
China's oceans have abundant oil and gas resources, and the reserves of the oceans are up to several billions of tons, wherein most of the oceans are located in deep sea areas. However, the manufacturing technology of core equipment (deep sea Christmas trees) for exploiting underwater oil and gas fields is mainly concentrated in the United states at present, China is forced to rely on import for a long time, and the cost is high.
With the increasing shortage of world energy situation, the deep sea oil extraction is the development direction in future, and the deep sea oil extraction tree is in extremely severe sea condition working environments such as high salt, high pressure, low temperature, high impact and the like all the year round. The connector is one of the important components of a deep sea christmas tree, and is located above the casing head to not only bear the entire weight of the christmas tree assembly, but also resist upward pressure from within the well and firmly secure the christmas tree to the wellhead. Therefore, the steel for the deep-sea Christmas tree equipment connector has to have comprehensive performances of high strength, high toughness (particularly low-temperature toughness), high pressure resistance, strong impact resistance, strong fatigue resistance and the like and good welding performance.
For structural members such as a Christmas tree connector with special strength grade and low-temperature toughness requirements, high-nickel or high-chromium molybdenum alloy steel is selected as a conventional design material, but the welding performance of connector forgings made of the high-nickel or high-chromium molybdenum alloy steel is difficult to meet the requirements, so various manufacturers try to replace the high-nickel or high-chromium molybdenum alloy steel with low-alloy high-strength steel to manufacture the structural members such as the Christmas tree connector.
Patent CN201010555698 of Nanjing Diwell heavy forging GmbH, published in 5/25/2011 discloses a manufacturing process of a steel forging for a deep sea Christmas tree equipment connector, wherein a chromium-nickel-molybdenum low alloy steel F65MOD material is selected, and the material comprises the following chemical components in percentage by weight: 0.10 to 0.12 percent of C, 0.30 to 0.35 percent of Si, 1.00 to 1.40 percent of Mn1.00, 0.015 percent of trace P, 0.010 percent of trace S, 0.10 to 0.25 percent of Cr, 0.15 to 0.40 percent of Mo, less than or equal to 0.04 percent of V, 0.50 to 1.00 percent of Ni0.50, less than or equal to 0.040 percent of Nb, 0.0005 percent of trace B, less than or equal to 0.0002 percent of [ H ], and 0.43 to 0.46 percent of CEV. Compared with the conventional design of selecting high nickel or high chromium molybdenum alloy steel, the welding performance is obviously improved, the price of raw materials is reduced, and the yield strength of the produced deep sea Christmas tree equipment connector can reach 450 MPa. The method has the disadvantages of complex manufacturing process, incapability of producing by the conventional process, long production period, low material utilization rate and greatly improved manufacturing cost and difficulty.
With the continuous improvement of oil extraction depth, the yield strength requirement of the deep sea Christmas tree equipment connector gradually develops from 450MPa to 550MPa and higher, and the 450MPa deep sea Christmas tree equipment connector cannot well meet the development of the current deep sea oil extraction industry and can not adapt to the requirement of future development.
Disclosure of Invention
The invention aims to provide the steel for the deep sea Christmas tree equipment connector, which has low cost, low temperature resistance and high strength, achieves the steel yield strength reaching 550MPa level, and has good low-temperature impact toughness and better welding performance.
The invention also aims to provide a heat treatment process of the steel for the deep sea Christmas tree equipment connector, which has low cost, low temperature resistance and high strength, the steel is quenched at 950 ℃ through 910-.
The specific technical scheme of the invention is as follows:
the steel for the deep sea Christmas tree equipment connector is low in cost, low in temperature resistance and high in strength, and comprises the following chemical components in percentage by weight:
0.13 to 0.15 percent of C, 0.20 to 0.28 percent of Si, 1.50 to 1.60 percent of Mn, 0.010 percent of trace of P, 0.005 percent of trace of S, 0.12 to 0.18 percent of Cr, 0.10 to 0.20 percent of Mo, 0.40 to 0.60 percent of Ni, 0.10 to 0.20 percent of V, 0.040 to 0.060 percent of Nb, 0.020 to 0.040 percent of Ti, 0.020 to 0.060 percent of Als, and the balance of Fe and other inevitable impurities.
Further, X ≦ 22.5 ≦ 26.5, where X ═ 75C +6(Mn + Cr) +2(Ni + Si) +7Mo + 9V.
CEV (%) ═ C + Mn/6+ (Mo + Cr + V)/5+ (Ni + Cu)/15, CEV is the carbon equivalent formula; the CEV of the invention: 0.48 to 0.55;
pcm (%) ═ C + (Mn + Cr + Cu)/20+ Si/30+ Mo/15+ Ni/60+ V/10+5B, Pcm is welding cold crack sensitivity index; the present invention Pcm: 0.25 to 0.28.
The production process flow of the steel for the deep sea Christmas tree equipment connector with low cost, low temperature resistance and high strength comprises the following steps: electric arc furnace or converter smelting → LF furnace refining → RH or VD vacuum degassing → continuous casting → heating of casting blank heating furnace → casting blank forging cogging → Christmas tree device connector blank forging → crude turning of Christmas tree device connector blank → heat treatment → fine turning of Christmas tree device connector, grinding → fault detection.
The heat treatment comprises quenching and high-temperature tempering, and the specific technical scheme is as follows:
the invention provides a heat treatment process of low-cost, low-temperature-resistant and high-strength steel for a deep sea Christmas tree equipment connector, which comprises quenching and tempering.
And (3) quenching: heating the steel for the deep sea Christmas tree equipment connector to the temperature of 910-; the water used for water cooling is controlled to be 25 +/-5 ℃ before quenching, and the water temperature is ensured to rise to be less than or equal to 10 ℃ in a stirring mode in the quenching process;
tempering: heating the quenched steel for the deep sea Christmas tree equipment connector to 660-690 ℃, calculating the heating and heat preservation time in the temperature section according to the thickness (unit: mm) of steel materials at 2.0-2.5min/mm, and then air-cooling to room temperature;
the heating speed in the quenching and tempering process is 50-100 ℃/h.
The design principle of the invention is as follows:
c: c is the most effective strengthening element in steel, and is an essential element for obtaining high strength in steel for deep-sea Christmas tree equipment connectors. The high carbon content, although beneficial to the strength of the steel, is detrimental to the plasticity and toughness of the steel and greatly reduces the weldability of the steel. The content of C is controlled between 0.13 percent and 0.15 percent.
Si: si is an important element for strengthening in steel, the strength and hardness of the steel are improved through solid solution, and researches show that Si has certain beneficial effect on corrosion resistance. However, too high a content deteriorates toughness and weldability, and also adversely affects the surface quality of steel, and the Si content is controlled to 0.20% to 0.28%.
Mn: mn and Fe form a solid solution, so that the hardness and strength of ferrite and austenite in the steel are improved, and meanwhile, Mn can improve the stability of an austenite structure. However, excessive Mn is liable to cause macro segregation, resulting in a significant decrease in the toughness of the steel. The Mn content is controlled to be 1.50-1.60%.
Cr: cr can significantly increase the strength of steel, but excessive Cr increases the temper brittleness tendency of steel and deteriorates weldability of steel. The Cr content is controlled to be 0.12-0.18 percent.
Mo: mo improves the strength of steel mainly through precipitation strengthening and solid solution strengthening of carbides, and can greatly improve the hardenability of the steel, and the fine carbide particles of Mo can not cause stress concentration of a microstructure, thereby being beneficial to improving the impact toughness of the steel. The content of Mo is controlled to be 0.10-0.20%.
V: the V added into the steel mainly plays a role in precipitation strengthening, the grain refining effect is relatively small, the effect of improving the strength is obvious, the toughness is improved slightly, the brittle transition temperature can be even improved, and the content of the V is not high enough and is controlled to be 0.10-0.20%.
Nb: nb carbonitride can pin the grain boundary and prevent austenite grains from growing, and has the main functions of refining grains, raising the grain coarsening temperature, raising the impact toughness and lowering the brittle transition temperature of steel, and Nb content controlled in 0.040-0.060%.
Ti: when the content of Ti is less than or equal to 0.08 percent, the grain refining effect is mainly achieved, TiN and TiC phases separated out by combining with C, N effectively block the growth of austenite grain size and achieve the effect of grain refining, and when V-Ti is added in a composite mode, the grain refining effect on the structure is better. Meanwhile, a certain amount of Ti is added into the steel, so that the aging sensitivity and the cold brittleness can be reduced, and the welding performance is improved. However, if the Ti content is too high, TiN point-shaped impurities are easy to liquify, the impact toughness of the material is reduced, and the Ti content is controlled to be 0.020-0.040%. The steel for the deep-sea Christmas tree equipment connector has higher requirements on low-temperature toughness while requiring high strength, so that the strength is greatly improved and good low-temperature toughness is ensured by adopting a Nb + V + Ti composite adding mode.
Ni: the lattice constant is close to that of face-centered cubic iron, so that continuous solid solution can be realized, the progress of cross slip is promoted, the dislocation motion resistance is reduced, the stress is relaxed, and the addition of Ni in the steel can effectively improve the core toughness of the steel, reduce the ductile-brittle transition temperature and improve the low-temperature impact property. In order to obtain good low-temperature toughness, the Ni content is controlled to be 0.40-0.60%.
Al: al is a commonly used deoxidizer in steel, and a proper amount of Al is added into the steel to refine grains and improve impact toughness, and the Al also has oxidation resistance and corrosion resistance, and if the content of the Al is too high, the hot workability, the welding performance and the like are adversely affected. The Al content is controlled to be 0.020-0.060%.
S and P: the formation of MnS inclusions and segregation at grain boundaries deteriorate the toughness of the steel, thereby reducing the toughness and plasticity of the steel. Since the steel contains a high content of Mn, the S content should be controlled to 0.005% or less. (ii) a P is an element with a strong segregation tendency, and also generally causes co-segregation of sulfur and manganese, which is detrimental to the uniformity of product texture and properties, and also has an adverse effect on welding properties. Controlling P to be less than or equal to 0.010 percent.
X: x mainly represents the strength and the welding performance of the material, and the specific calculation formula is as follows: x is 75C +6(Mn + Cr) +2(Ni + Si) +7Mo + 9V. For low alloy steel, the carbon content in steel is the main factor determining the strength and the welding performance of the material, other alloy elements in the steel also have different degrees of influence on the strength and the welding performance of the material, C can improve the strength and the hardness of a welding seam, but can increase the crystallization crack of the welding seam and the cold crack tendency of a welding joint at the same time, so that the welding performance is deteriorated, the contribution of C to X parameters is the maximum, and the coefficient is determined to be 75; mn can improve the weld structure, refine pearlite grains, improve the strength and hardenability of the weld, reduce the ductile-brittle transition temperature, and optimize the impact toughness of the weld in a welding state and a stress relief state when the Mn content is about 1.5%. Meanwhile, Mn can be used for desulfurization, so that the distribution of low-melting-point compounds among crystals is reduced, the crystal crack sensitivity of weld metal is reduced, and the coefficient is determined to be 6; si can cause solid solution strengthening and secondary phase precipitation increase, so that weld metal becomes brittle and is harmful to toughness, but a proper amount of Si can prevent weld pores from being formed, and the coefficient of Si is determined to be 2; mo can improve the hardening tendency of a heat affected zone, so that the crack sensitivity is increased, the influence of Mo on the weld joint strength is greater than that of Mn, and the coefficient is determined to be 7; cr can improve the heat resistance of a welding line and the hardness of welding line metal, and can improve the ductile-brittle transition temperature, and the coefficient is determined as 6; the addition of Ni can improve the strength of a welding seam, but the crack sensitivity is enhanced when the Ni content is higher, and the coefficient is determined to be 2; v can refine the as-cast structure of the weld metal, prevent the excessive growth of the heat affected zone grains, and the coefficient is set to be 9. And obtaining the parameter X according to the proportion of the comprehensive influence of different alloy elements on the strength and the welding performance of the material. The welding performance of the material is deteriorated due to the over-high X value, and the use requirement of the mechanical property of the material cannot be met due to the over-low X value, so that the X value is controlled to be 22.5-26.5.
The steel for the deep sea Christmas tree equipment connector has the advantages of low cost, high strength, low temperature resistance, good welding performance and the like, and in order to ensure the effect, the carbon equivalent mainly influences elements such as C, Mn, Cr, Mo and V to be controlled according to upper limits or subsidence, if part of the elements are close to the upper limits or the lower limits, the other elements are controlled according to the lower limits or the upper limits, and the carbon equivalent is controlled within the design requirements.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the steel for the deep sea Christmas tree equipment connector, the ratio of each element in the steel is designed, and a proper heat treatment process is combined, so that the finally obtained forged piece has the yield strength of more than or equal to 550MPa, the tensile strength of more than or equal to 660MPa, the elongation after fracture of more than or equal to 21%, the reduction of area of more than or equal to 72%, the low-temperature impact energy at minus 46 ℃ of more than or equal to 130J, the low-temperature impact energy at minus 60 ℃ of more than or equal to 90J and good welding performance. Compared with a chromium-nickel-molybdenum low alloy steel F65MOD material adopted in the patent CN201010555698, when the steel for the deep sea Christmas tree equipment connector is used for manufacturing the deep sea Christmas tree equipment connector, the related performance requirements of the Christmas tree equipment connector can be met by adopting a conventional forging process, repeated upsetting and drawing in the three-dimensional coordinate direction are not needed, the forging difficulty and the forging cost are greatly reduced, the yield strength is also improved to 550MPa from 450MPa, and the adjustment space of a heat treatment process is larger.
(2) The steel for the deep sea Christmas tree equipment connector provided by the invention has the yield strength of more than or equal to 550MPa and the low-temperature impact energy of-60 ℃ of more than or equal to 90J, and is suitable for deep sea Christmas tree equipment connectors with lower environmental temperature and higher strength requirements.
Drawings
FIG. 1 is the microstructure (500X) of example 1;
FIG. 2 shows the grain size of example 1 (100X, grade 8.5).
The following examples are intended to illustrate the invention, but the scope of protection of the invention is not limited to the following examples.
Example 1 to example 4
The steel for the deep sea Christmas tree equipment connector is low in cost, low in temperature resistance and high in strength, and the production process flow is as follows: electric arc furnace or converter smelting → LF furnace refining → RH or VD vacuum degassing → continuous casting → heating of casting blank heating furnace → casting blank forging cogging → Christmas tree device connector blank forging → crude turning of Christmas tree device connector blank → heat treatment → fine turning of Christmas tree device connector, grinding → fault detection.
The steel for the deep sea Christmas tree equipment connector in the examples 1-4 and the comparative example have the chemical components with the weight percentages shown in the table 1, and the balance of Fe and inevitable impurities which are not shown in the table 1 are taken as the comparative example of the F22 steel for the petroleum forging.
The low cost, low temperature resistant, high strength steel for deep sea Christmas tree equipment connectors described in examples 1-4 and the heat treatment described in the production process of the comparative examples, including quenching and tempering.
And (3) quenching: heating the steel for the deep sea Christmas tree equipment connector to a temperature of 910-;
tempering: heating the quenched steel for the deep sea Christmas tree equipment connector to 660-690 ℃, calculating the heating and heat preservation time in the temperature section according to the thickness (unit: mm) of steel materials at 2.0-2.5min/mm, and then air-cooling to room temperature;
the heating speed in the quenching and tempering process is 50-100 ℃/h.
Specific process parameters for the heat treatment of examples 1-4 and comparative examples are shown in Table 2.
The steel for deep sea Christmas tree equipment connectors described in examples 1 to 4 and comparative example the steel produced according to the above method (thickness of 80mm each) were examined for mechanical properties as shown in Table 3.
TABLE 1 examples 1-4 chemical compositions (unit: wt%)
Table 2 examples 1-4 heat treatment process
Table 3 mechanical properties of examples 1 to 4
| Examples | Rm/MPa | ReL/MPa | A/％ | Z/％ | -46℃KV2/J | -60℃KV2/J |
| Example 1 | 673 | 569 | 22 | 74 | 138 | 92 |
| Example 2 | 681 | 570 | 22 | 72 | 133 | 94 |
| Example 3 | 669 | 559 | 23 | 75 | 145 | 98 |
| Example 4 | 685 | 588 | 21 | 73 | 133 | 93 |
| Comparative example | 730 | 589 | 19 | 53 | 102 | 78 |
As can be seen from tables 1 to 3, although the F22 steel in the comparative example has higher strength and better low-temperature impact toughness, the X value is as high as 35.2, which is far beyond the range of X being not less than 22.5 and not more than 26.5 in the embodiment, the welding performance is poor, and the requirement of the deep sea Christmas tree equipment connector on the welding performance is difficult to meet. In each embodiment, the yield strength is more than or equal to 550MPa, the tensile strength is more than or equal to 660MPa, the elongation after fracture is more than or equal to 21 percent, the reduction of area is more than or equal to 72 percent, the low-temperature impact energy at minus 46 ℃ is more than or equal to 130J, the low-temperature impact energy at minus 60 ℃ is more than or equal to 90J, the connector has good welding performance, and can be suitable for deep-sea Christmas tree equipment connectors with lower environmental temperature and higher strength requirements.
Claims (7)
1. The steel for the low-cost, low-temperature-resistant and high-strength deep sea Christmas tree equipment connector is characterized by comprising the following chemical components in percentage by weight:
0.13 to 0.15 percent of C, 0.20 to 0.28 percent of Si, 1.50 to 1.60 percent of Mn, 0.010 percent of P, 0.005 percent of S, 0.12 to 0.18 percent of Cr, 0.10 to 0.20 percent of Mo, 0.40 to 0.60 percent of Ni, 0.10 to 0.20 percent of V, 0.040 to 0.060 percent of Nb0.020 to 0.040 percent of Ti, 0.020 to 0.060 percent of Als, and the balance of Fe and other inevitable impurities.
2. The low-cost, low-temperature-resistant, high-strength steel for deep sea Christmas tree equipment connectors according to claim 1, wherein the chemical component contents are controlled so that 22.5. ltoreq. X.ltoreq.26.5, wherein X is 75C +6(Mn + Cr) +2(Ni + Si) +7Mo + 9V.
3. The heat treatment process of the low-cost, low-temperature-resistant, high-strength steel for deep sea Christmas tree equipment connectors according to claim 1 or 2, wherein the heat treatment process comprises quenching and tempering.
4. The process of claim 3, wherein the quenching: heating the steel for the deep sea Christmas tree equipment connector to the temperature of 910-.
5. The treatment process as claimed in claim 4, wherein the water used for water cooling is controlled to have a water temperature of 25 ± 5 ℃ before quenching, and the water temperature is kept to rise by less than or equal to 10 ℃ in a stirring manner during quenching.
6. The process according to claim 3 or 4, wherein the tempering: heating the quenched steel for the deep sea Christmas tree equipment connector to 660-690 ℃, wherein the heating and heat preservation time in the temperature section is calculated according to 2.0-2.5min/mm multiplied by the thickness mm of the steel, and then air cooling to room temperature.
7. The process according to any one of claims 3 to 6, wherein the heating rate during the quenching and tempering process is 50-100 ℃/h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114540716A (en) * | 2022-03-04 | 2022-05-27 | 马鞍山钢铁股份有限公司 | High-strength high-toughness long-service-life steel for valve body of underwater Christmas tree with wall thickness of more than or equal to 600mm, and heat treatment method and production method thereof |
| CN114561593A (en) * | 2022-03-04 | 2022-05-31 | 马鞍山钢铁股份有限公司 | Steel for long-life high-strength-toughness corrosion-resistant underwater Christmas tree valve body, heat treatment method and production method thereof |
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| JP2007146238A (en) * | 2005-11-28 | 2007-06-14 | Nippon Steel Corp | Bainitic rail |
| CN104911503A (en) * | 2015-06-12 | 2015-09-16 | 江阴兴澄特种钢铁有限公司 | Extra-thick tempering EH40 steel for ocean engineering and preparation method thereof |
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| JP2007146238A (en) * | 2005-11-28 | 2007-06-14 | Nippon Steel Corp | Bainitic rail |
| CN104911503A (en) * | 2015-06-12 | 2015-09-16 | 江阴兴澄特种钢铁有限公司 | Extra-thick tempering EH40 steel for ocean engineering and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114540716A (en) * | 2022-03-04 | 2022-05-27 | 马鞍山钢铁股份有限公司 | High-strength high-toughness long-service-life steel for valve body of underwater Christmas tree with wall thickness of more than or equal to 600mm, and heat treatment method and production method thereof |
| CN114561593A (en) * | 2022-03-04 | 2022-05-31 | 马鞍山钢铁股份有限公司 | Steel for long-life high-strength-toughness corrosion-resistant underwater Christmas tree valve body, heat treatment method and production method thereof |
| WO2023165617A1 (en) * | 2022-03-04 | 2023-09-07 | 马鞍山钢铁股份有限公司 | High-strength and high-toughness steel with long service life and wall thickness of ≥ 600 mm for valve body of subsea christmas tree, and heat treatment method and production method therefor |
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