Hydrogen sulfide corrosion-resistant pipeline steel X60MS in high-temperature service environment and manufacturing method of hydrogen sulfide corrosion-resistant pipeline steel X60MS

Abstract

The invention discloses hydrogen sulfide corrosion resistant pipeline steel X60MS in a high-temperature service environment and a manufacturing method thereof, the pipeline steel X60MS has high temperature resistance and hydrogen sulfide corrosion resistance, and the pipeline steel X60MS comprises the following chemical components in percentage by mass: 0.02-0.06% of C, 0.30-0.45% of Si, 1.00-1.25% of Mn, 0.040-0.060% of Alt, 0.035-0.050% of Nb, 0.010-0.020% of Ti, less than or equal to 0.015% of P, less than or equal to 0.0015% of S, 0.20-0.30% of Cr, 0.15-0.25% of Ni, less than or equal to 2ppm of H, less than or equal to 25ppm of O and less than or equal to 50ppm of N. When an MST6-DFY-3 type high-temperature and high-pressure dynamic corrosion experimental instrument is used for testing, the corrosion rate of the pipeline steel X60MS coupon can reach 0.685 mm / year under the condition of 85 DEG C.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgical materials, and in particular relates to a hydrogen sulfide corrosion resistant pipeline steel X60MS under a high temperature service environment and a manufacturing method thereof. Background Art

[0002] There are many sulfur-containing oil and gas resources in some oil and gas reservoirs, but the difficulty of exploitation is also high. It is very easy to release a certain amount of H2S gas during exploration and development and oil and gas gathering and transportation. The presence of H2S will not only cause serious corrosion damage to the surface pipeline equipment, downhole pipe string and wellhead equipment of the oil and gas field, but also may pose a great safety risk, seriously affecting the normal safe production and gathering and transportation of the oil and gas field. In the transportation process of such sulfur-containing oil and gas resources, the presence of H2S gas may cause serious corrosion damage to the gathering and transportation pipeline, and may even cause corrosion perforation of the gathering and transportation pipeline, affecting the efficient and safe transportation of oil and gas resources.

[0003] Patent document CN111893401A discloses "L450MS pipeline steel with excellent SSCC resistance under high loading stress and its manufacturing method", whose composition design system is C (0.055% to 0.075%) -Si (0.15% to 0.25%) -Mn (1.50% to 1.60%) -P (≤0.010%) -S (≤0.001%) -Cr (0.11% to 0.19%) -Nb (0.045% to 0.065%) -Ti (0.008% to 0.025%) -Als (0.015% to 0.045%) -Mo (0.06 to 0.10) -N (≤0.004%) -H (≤0.0001%) -O (≤0.0010%), and the balance is Fe and unavoidable impurities. The manufacturing method includes smelting - continuous casting - slab cleaning - slab heating - rolling - ultra-fast cooling + laminar cooling - coiling. The anti-HIC and anti-SSCC inspection requirements under high loading stress (85% of the nominal yield strength) are excellent in low-temperature fracture toughness, the fracture shear area at -30°C is ≥95%; the Charpy impact energy at -40°C is ≥350J. The production control process of the present invention is similar to that of the introduced patent, but does not involve ultra-fast cooling process. Its focus is on improving its corrosion resistance from the aspects of product composition design and organizational morphology control. It provides corrosion indicators of materials under high temperature conditions and provides guidance for safe application.

[0004] Patent document CN 106811700 B discloses "A thick-gauge acid-resistant X60MS hot-rolled coil and its manufacturing method", whose composition design system is C (0.05% to 0.07%) -Si (0.15% to 0.25%) -Mn (1.35% to 1.45%) -P (≤0.015%) -S (≤0.0015%) -Cr (0.08% to 0.18%) -Nb (0.025% to 0.045%) -Ti (0.008% to 0.025%) -Als (0.015% to 0.045%) -Mo (0.06 to 0.10) -N (≤0.006%) -H (≤0.0002%) -O (≤0.0020%), and the balance is Fe and unavoidable impurities. The manufacturing method includes smelting - continuous casting - slab cleaning - slab heating - rolling - cooling - coiling. The continuous casting slab is directly heated in a hot charging furnace at a temperature of 500-850℃, and is heated to 1160-1200℃ in a walking beam heating furnace before being discharged from the furnace; two-stage controlled rolling, laminar cooling at a rate of 10-30℃ / s, and coiling at 500-560℃. The product has excellent comprehensive performance, especially acid resistance and low-temperature fracture toughness. The production control process of the present invention is similar to that of the introduced patent, but its focus is on improving the corrosion resistance under high temperature conditions from the aspects of product composition design and organizational morphology control. It provides corrosion indicators of materials under high temperature conditions, providing guidance for safe application.

[0005] The document "Study on Hydrogen Sulfide Corrosion and Protection Measures of Gathering and Transportation Pipeline Steel" takes conventional transportation pipeline steel X65M as the research object and analyzes that when the experimental temperature rises from 30°C to 60°C, the corrosion rate of the hanging piece can increase from 0.187mm / year to 0.772mm / year, and the corrosion rate increases by more than 3 times, and the corrosion rate increases rapidly. The study adds 0.05% of the mass fraction of corrosion inhibitor HSR-1 (imidazoline composite type), and the corrosion protection effect is better, and the corrosion inhibition efficiency can reach 95.1%. The present invention focuses on improving its corrosion resistance from the aspects of product composition design and organizational morphology control. Summary of the invention

[0006] Based on the current application status of H2S-rich oil and gas gathering and transportation pipelines, the core of the present invention is to provide a high-grade pipeline steel X60MS hot-rolled steel strip with both high temperature resistance and hydrogen sulfide corrosion resistance and a preparation method thereof, laying a solid foundation for the efficient development of my country's energy.

[0007] Based on the above technical background, with Si-Cr-Al-Ni as the main alloying component design system, through the smelting of ultra-pure steel, homogenization continuous casting and hot rolling controlled rolling and controlled cooling control technology, the product is mainly acicular ferrite or granular bainite. The microstructure is obtained, and fine grain strengthening is used as the main measure to ensure the strength and toughness of the product, so that the material has good H2S corrosion resistance under high temperature (25-85°C) service. Based on this product control strategy, a manufacturing method for X60MS hot-rolled pipeline steel strip resistant to hydrogen sulfide corrosion in high temperature service environment was invented. The product composition design system is (0.02~0.06%)C-(0.30~0.45%)Si-(1.00~1.25%)Mn-(0.040~0.060%)Al-(0.035~0.050%)Nb-(0.010~0.020%)Ti-(≤0.015%)P-(≤0.0015%)S-(0.20~0.30)Cr-(0.15~0.25)Ni-Fe, H≤2ppm, O≤25ppm, N≤50ppm. The rolling adopts the controlled cooling process of 2250mm hot rolling unit (ingot heating-rough rolling-finishing rolling-layer cooling-coiling). The mechanical properties of the product meet the yield strength: 445~500MPa, tensile strength: 550~600MPa, elongation A 50 :25~30%, yield strength ratio ≤0.90; -30℃ impact performance meets AKv2≥350J (full size); -30℃ drop weight performance (DWTT) SR≥90%; the sum of non-metallic inclusions (A+B+C+D) inclusions ≤1.5, grain size ≥11. GB / T 8650-2015 "Evaluation Method for Hydrogen Cracking Resistance of Pipeline Steel and Pressure Vessel Steel" is used to evaluate the HIC performance of the material, and the crack length rate (CLR), crack thickness rate (CTR) and crack sensitivity rate (CSR) are all zero; NACE TM0177-2005 "Metal Resistance to Sulfide Stress Cracking and Stress Corrosion in H2S Environment" method B is used to evaluate its SSC performance, and there are no cracks on the tensile surface. The corrosion rate of the coupon can reach less than 0.685mm / year under the condition of 85℃ tested by MST6-DFY-3 high temperature and high pressure dynamic corrosion tester. The production process is relatively simple and executable, and it has good H2S corrosion resistance under high temperature conditions. It is suitable for enterprise batch stable production and efficient application of gathering and transportation pipeline projects.

[0008] The specific technical solutions of the present invention are as follows:

[0009] The invention provides a pipeline steel X60MS resistant to hydrogen sulfide corrosion in a high-temperature service environment. The chemical composition of the pipeline steel X60MS is as follows by mass percentage: C 0.02-0.06%, Si 0.30-0.45%, Mn 1.00-1.25%, Alt 0.040-0.060%, Nb 0.035-0.050%, Ti 0.010-0.020%, P≤0.015%, S≤0.0015%, Cr 0.20-0.30%, Ni 0.15-0.25%, H≤2ppm, O≤25ppm, N≤50ppm, and the rest is Fe and unavoidable impurities.

[0010] In some embodiments, the chemical composition of the hydrogen sulfide corrosion resistant pipeline steel X60MS under high temperature service environment is calculated by mass percentage: C 0.03-0.06%, Si 0.38-0.45%, Mn 1.18-1.25%, Alt 0.046-0.052%, Nb0.035-0.047%, Ti 0.010-0.015%, P≤0.015%, S≤0.0015%, Cr 0.22-0.30%, Ni 0.18-0.22%, H≤2ppm, O≤25ppm, N≤50ppm, and the rest is Fe and unavoidable impurities.

[0011] In some embodiments, the mechanical properties of the hydrogen sulfide corrosion resistant pipeline steel X60MS under high temperature service environment meet the following requirements: yield strength: 445-500 MPa, tensile strength: 550-600 MPa, elongation A 50 : 25-30%, yield strength ratio ≤0.90; -30℃ impact performance meets AKv2≥350J (full size); -30℃ drop hammer performance (DWTT) SR≥90%; the sum of non-metallic inclusions (A+B+C+D) inclusions ≤1.5 level, grain size ≥11 level.

[0012] In some embodiments, the hydrogen sulfide corrosion-resistant pipeline steel X60MS in high-temperature service environment adopts GB / T8650-2015 "Method for Assessment of Hydrogen Induced Cracking Resistance of Pipeline Steel and Pressure Vessel Steel" to evaluate the HIC performance of the material, and the crack length rate (CLR), crack thickness rate (CTR) and crack sensitivity rate (CSR) are all zero; the SSC performance is evaluated by method B of NACE TM 0177-2005 "Metal Resistance to Sulfide Stress Cracking and Stress Corrosion in H2S Environment", and there are no cracks on the tensile surface.

[0013] In some embodiments, the corrosion rate of the hanging piece of hydrogen sulfide corrosion resistant pipeline steel X60MS in the high temperature service environment does not exceed 0.685 mm / year when tested at 85°C using a MST6-DFY-3 high temperature and high pressure dynamic corrosion tester.

[0014] Another aspect of the present invention provides a method for manufacturing X60MS pipeline steel resistant to hydrogen sulfide corrosion in a high-temperature service environment, which comprises the following processes: a smelting continuous casting process and a rolling process.

[0015] In some embodiments, the smelting and continuous casting process is: molten iron → KR desulfurization → converter steelmaking → LF refining → RH degassing → slab continuous casting; wherein the smelting adopts KR pre-desulfurized molten iron (the molten iron [S] entering the furnace is required to be ≤0.005%), the converter top and bottom composite blowing, the initial and final stages of smelting use a relatively strong bottom blowing argon stirring, double slag tapping, and a certain amount of synthetic slag is added during the tapping process, the tapping process uses ferrosilicon, ferromanganese, ferrochrome, and ferronickel for deoxidation and alloying in turn, and LF alloying Ferroniobium is added at the end, and ferrotitanium is added at the end of RH; argon is blown and stirred during the whole process of molten steel; vacuum degree is ≤2mbar, deep vacuum time is ≥15min, low superheat casting is adopted, and the superheat ΔT is ≤25~35℃, dynamic light pressure is put into use, and the center segregation (C type below 2.0 level) and center looseness (below 0.5 level) of the continuous casting billet are strictly controlled to ensure the quality of the continuous casting billet; the billet thickness is 230mm, and its solidification cooling rate is much greater than that of traditional thick slabs, and the secondary dendrite spacing is greatly reduced.

[0016] In some embodiments, the rolling process is: slab heating - high-pressure water descaling - fixed-width press - E1R1 roughing mill rolling - E2R2 roughing mill rolling - flying shear - high-pressure water descaling - F1~F7 finishing mill rolling - encrypted laminar flow segmented cooling - coiling - pallet transportation system - warehouse stacking slow cooling - sampling and inspection; wherein the slab heating temperature is 1200±20℃; heating time is 180~240min; rough rolling mode adopts 1+5, 3+3 or 3+5; intermediate billet thickness range: 35~50mm; finishing rolling start temperature ≤980℃; finishing rolling final rolling temperature 820~850℃, front-end cooling is adopted to achieve a coiling temperature of 500~580℃; microstructure grain size is ≥11 levels, and the core-surface microstructure grain grade difference is ≤2 levels.

[0017] The beneficial effects of the present invention are as follows: the present invention provides a pipeline steel X60MS hot-rolled steel strip with good hydrogen sulfide corrosion resistance in a high temperature (25-85°C) environment with a C-Si-Mn-Nb-Ti-Cr-Ni composition system, and innovatively proposes a composition design with high temperature corrosion resistance: Al alloy addition is generally a deoxidizer in steel, and the present invention will further work with Si and Cr on the basis of Al deoxidation to improve the material's high temperature corrosion resistance; Ni alloy has high corrosion resistance in both acid and alkali environments, but because the alloy is expensive, it is used in combination with Cr to reduce the product manufacturing cost while ensuring that the product has good high temperature corrosion resistance. Production practice has been achieved in a 2250mm hot rolling production line, which has good promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The results show the comparison of the corrosion resistance of the product X60MS designed by the present invention under high temperature service and that of the conventional X60MS. DETAILED DESCRIPTION

[0019] The purpose of the present invention is to achieve through the following measures:

[0020] The pipeline steel X60MS hot-rolled steel strip with good hydrogen sulfide corrosion resistance serving in high temperature (25-85°C) environment is designed with a C-Si-Mn-Nb-Ti-Cr-Ni composition system, and an innovative composition design with high temperature corrosion resistance is proposed: Al alloy is generally added as a deoxidizer in steel. The present invention will further cooperate with Si and Cr on the basis of Al deoxidation to improve the material's high temperature corrosion resistance; Cr alloy can improve the material's oxidation resistance and corrosion resistance, and is a necessary element added to heat-resistant steel and corrosion-resistant steel; Ni alloy has high corrosion resistance in both acid and alkali environments, but due to the high price of the alloy, it is generally used in combination with Cr.

[0021] The smelting and continuous casting process is: molten iron → KR desulfurization → converter steelmaking → LF refining → RH degassing → slab continuous casting. The converter smelting uses KR pre-desulfurized molten iron (the molten iron [S] is required to be ≤0.005%), the converter top and bottom composite blowing, the initial and final stages of smelting use strong bottom blowing argon stirring, double slag tapping, and a certain amount of synthetic slag is added during the tapping process. The tapping process uses ferrosilicon, ferromanganese, ferrochrome, and ferronickel for deoxidation and alloying, ferroniobium is added at the end of LF alloying, and ferrotitanium is added at the end of RH. The molten steel is stirred with argon blowing throughout the process; the vacuum degree is ≤2mbar, the deep vacuum time is ≥15min, low superheat casting is used, and the superheat ΔT is ≤25~35℃, dynamic light pressure is put into use, and the center segregation (C class 2.0 or less) and center looseness (0.5 or less) of the continuous casting billet are strictly controlled to ensure the quality of the continuous casting billet. The thickness of the ingot is 230 mm, and its solidification cooling rate is much greater than that of traditional thick slabs, and the secondary dendrite spacing is greatly reduced.

[0022] Material composition control: C content is controlled at 0.02% to 0.06% (preferably 0.030% to 0.050%) to ensure a certain solid solution strengthening effect, reduce band segregation, and improve corrosion resistance; Si content is controlled at 0.30% to 0.45% (preferably 0.35% to 0.40%) to increase the strength of ferrite, improve material strength and high temperature oxidation resistance; Mn content is controlled at 1.00% to 1.25% (preferably 1.05% to 1.15%), which is solid The Mn content is controlled at 0.040-0.060% (preferably 0.045-0.055%) to improve the material's high temperature corrosion resistance by working together with Si and Cr on the basis of deoxidation. The Cr content is controlled at 0.20-0.30% to improve the material's oxidation resistance and corrosion resistance. The Ni content is controlled at 0.15-0.0 .25%, which has high corrosion resistance in both acid and alkali environments, and the corrosion resistance is more significantly improved when mixed with Cr; the Nb content is controlled at 0.035%~0.050% (preferably 0.035%~0.045%), which plays a role in refining grains, can improve the impact toughness of steel and reduce its brittle transition temperature, which is beneficial to strength and toughness; the Ti content is controlled at 0.010%~0.020% (preferably 0.010%~0.015%), and is used in combination with Nb to improve the mixed crystal phenomenon and further refine the uniform structure; the P content is controlled at ≤0.015% (preferably ≤0.010%), which is a harmful element and needs to be effectively controlled, causing cold brittleness, and significantly reducing plasticity and impact toughness; the S content is controlled at ≤0.0015%, which is a harmful element and needs to be effectively controlled. The formation of MnS inclusions can significantly increase the tendency of hydrogen sulfide corrosion resistance; the gas in the steel is controlled to be H≤2ppm, O≤25ppm, and N≤50ppm.

[0023] The rolling process is: slab heating - high-pressure water descaling - fixed width press - E1R1 roughing mill rolling - E2R2 roughing mill rolling - flying shear - high-pressure water descaling - F1~F7 finishing mill rolling - encrypted laminar flow segmented cooling - coiling - pallet transportation system - warehouse stacking slow cooling - sampling and inspection. The slab heating temperature is 1200±20℃; heating time is 180~240min; rough rolling mode adopts 1+5, 3+3 or 3+5; intermediate billet thickness range: 35~50mm; finishing rolling start temperature ≤980℃; finishing rolling final rolling temperature 820~850℃, front-end cooling is used, and the coiling temperature is 500~580℃. The grain size of the organization is ≥11 levels, and the core surface organization grain level difference is ≤2 levels.

[0024] Material purification and homogenization control: Ultra-purification control and organizational uniformity control of materials are the basis for ensuring that the materials have good resistance to hydrogen sulfide corrosion. By adopting the double refining smelting process, the product's non-metallic inclusions A, B, C, D levels are ≤1.0, and the sum of non-metallic inclusion levels is ≤1.5.

[0025] Specifically, the manufacturing method of hydrogen sulfide corrosion resistant pipeline steel X60MS in high temperature service environment includes the following processes:

[0026] 1. Material smelting

[0027] 1.1 Composition design: The composition design scheme of the high temperature resistant and H2S corrosion resistant pipeline steel hot rolled steel strip product X60MS is shown in Table 1.

[0028] Table 1: Composition design (mass percentage)

[0029]

[0030] 1.2 Converter smelting: Converter smelting uses KR pre-desulfurized molten iron (the molten iron entering the furnace is required to have [S] ≤ 0.005%), converter top and bottom composite blowing, high-intensity bottom blowing argon stirring at the initial and final stages of smelting, double-block slag tapping, and a certain amount of synthetic slag is added during the tapping process. The tapping process uses ferrosilicon, ferromanganese, ferrochrome, and ferronickel for deoxidation and alloying, controls the P and S components, prevents overoxidation of the molten steel, controls the tapping amount, and prevents slag from entering the molten steel. The tapping temperature is 1600-1650°C, and the converter tapping [P] ≤ 0.010%, [S] ≤ 0.008%.

[0031] 1.3 Refining outside the furnace: Adopt LF+RH full-process argon blowing process, maintain a good reducing atmosphere during the refining process, use Al wire for deoxidation, add ferroniobium at the end of LF alloying, and add ferrotitanium at the end of RH. The molten steel is stirred with argon blowing during the whole process; vacuum degree ≤2mbar, deep vacuum time ≥15min, and calcium treatment is carried out after completion.

[0032] 1.4 Slab continuous casting: low superheat casting is adopted, and its superheat ΔT≤25~35℃, dynamic light pressure is put into use, and the center segregation (C-type 2.0 or less) and center looseness (0.5 or less) of the continuous casting billet are strictly controlled to ensure the quality of the continuous casting billet. The billet thickness is 2300mm, and its solidification cooling rate is much greater than that of traditional thick slabs, and the secondary dendrite spacing is greatly reduced. The first and last billets and mixed billets should not be used for high temperature resistant and hydrogen sulfide corrosion resistant pipeline steel.

[0033] 2. Controlled rolling and controlled cooling process

[0034] The ingot is heated in a walking-beam heating furnace (the heating process is shown in Table 2). The rough rolling adopts single-stand R1 and R2 reciprocating rolling. The rough rolling modes adopted are 1+5, 3+3 and 3+5. The finishing rolling adopts F1~F7 continuous rolling process. The specific controlled rolling and controlled cooling process is shown in Table 3.

[0035] Table 2: Billet heating system

[0036]

[0037] Table 3: Rolling system

[0038]

[0039] 3. Example Analysis

[0040] 3.1 According to the above smelting technical requirements, X60MS ingots with the following composition are smelted. The specific composition is shown in Table 4.

[0041] Table 4: Chemical composition of each example (mass percentage: %)

[0042]

[0043] 3.2 According to the above composition design and hot rolling process, the mechanical properties of the product are shown in Table 5.

[0044] Table 5: X60MS steel belt properties of various examples

[0045]

[0046] 3.3 According to the above composition design and hot rolling process, the product is fixed under the experimental conditions of H2S partial pressure of 0.1MPa, water content of corrosive medium of 45%, and experimental flow rate of 0.35m·s -1 , under the premise of the pH value of the corrosive medium being 7, the high temperature corrosion resistance of the material is analyzed using a high temperature and high pressure dynamic corrosion tester. Figure 1 shown.

[0047] 3.4 Designed according to the above components and manufactured by hot rolling process, the product is tested according to the following inspection standard: NACE TM 0284-2011, A solution, 96 hours. The material resistance to hydrogen sulfide corrosion cracking (HIC) index is shown in Table 6.

[0048] Table 6: Example HIC performance

[0049]

[0050] 3.5 Designed according to the above components and manufactured by hot rolling process, the products are tested according to the following standards: NACE TM 0177-2005 (four-point bending method), solution A, 720 hours, loading stress is 80% of the nominal minimum yield strength. The material resistance to hydrogen sulfide stress corrosion cracking (SSC) index is shown in Table 7.

[0051] Table 7: Example SSC performance

[0052]

[0053] 3.6 The metallographic structure of the product is acicular bainitic ferrite, with a grain size of 11 to 12 levels, and the grain size difference between the core and surface structures is ≤ 2 levels.

[0054] In summary, the invented material has good high temperature resistance and H2S corrosion resistance, can be promoted and applied in the field of medium and low pressure pipeline transportation in large quantities, and provides broad space for energy application.

[0055] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pipeline steel X60MS resistant to hydrogen sulfide corrosion in high temperature service environment, characterized in that: The chemical composition of the hydrogen sulfide corrosion resistant pipeline steel X60MS under the high temperature service environment is calculated by mass percentage: C 0.02-0.06%, Si 0.30-0.45%, Mn 1.00-1.25%, Alt 0.040-0.060%, Nb 0.035-0.050%, Ti 0.010-0.020%, P≤0.015%, S≤0.0015%, Cr 0.20-0.30%, Ni 0.15-0.25%, H≤2ppm, O≤25ppm, N≤50ppm, and the rest is Fe and unavoidable impurities.

2. The hydrogen sulfide corrosion resistant pipeline steel X60MS for high temperature service environment according to claim 1 is characterized in that: The chemical composition of the hydrogen sulfide corrosion resistant pipeline steel X60MS under the high temperature service environment is calculated by mass percentage as follows: C 0.03-0.06%, Si 0.38-0.45%, Mn 1.18-1.25%, Alt 0.046-0.052%, Nb 0.035-0.047%, Ti 0.010-0.015%, P≤0.015%, S≤0.0015%, Cr 0.22-0.30%, Ni 0.18-0.22%, H≤2ppm, O≤25ppm, N≤50ppm, and the rest is Fe and unavoidable impurities.

3. The hydrogen sulfide corrosion resistant pipeline steel X60MS for high temperature service environment according to claim 1 or 2, characterized in that: The mechanical properties of the hydrogen sulfide corrosion resistant pipeline steel X60MS under high temperature service environment meet the following requirements: yield strength: 445-500MPa, tensile strength: 550-600MPa, elongation A 50 : 25-30%, yield strength ratio ≤0.90; -30℃ impact performance meets AKv2≥350J (full size); -30℃ drop hammer performance (DWTT) SR≥90%; the sum of non-metallic inclusions (A+B+C+D) inclusions ≤1.5 level, grain size ≥11 level.

4. The hydrogen sulfide corrosion resistant pipeline steel X60MS in high temperature service environment according to any one of claims 1 to 3, characterized in that: The HIC performance of the hydrogen sulfide corrosion-resistant pipeline steel X60MS under high-temperature service environment is evaluated by GB / T 8650-2015 "Method for evaluating the resistance of pipeline steel and pressure vessel steel to hydrogen induced cracking", and the crack length rate (CLR), crack thickness rate (CTR) and crack sensitivity rate (CSR) are all zero; the SSC performance is evaluated by method B of NACE TM 0177-2005 "Metal resistance to sulfide stress cracking and stress corrosion in H2S environment", and there are no cracks on the tensile surface.

5. The hydrogen sulfide corrosion resistant pipeline steel X60MS in high temperature service environment according to any one of claims 1 to 4, characterized in that: The hydrogen sulfide corrosion resistant pipeline steel X60MS in the high temperature service environment is tested by using MST6-DFY-3 high temperature and high pressure dynamic corrosion tester under 85°C conditions, and the corrosion rate of the hanging piece does not exceed 0.685mm / year.

6. The method for manufacturing hydrogen sulfide corrosion resistant pipeline steel X60MS in high temperature service environment according to any one of claims 1 to 5, characterized in that: The manufacturing method comprises the following processes: Smelting continuous casting process and rolling process.

7. The manufacturing method according to claim 6, characterized in that: The smelting and continuous casting process is: molten iron → KR desulfurization → converter steelmaking → LF refining → RH degassing → slab continuous casting; The smelting adopts KR pre-desulfurized molten iron (the molten iron [S] is required to be ≤0.005%), the top and bottom composite blowing of the converter, the bottom blowing of argon with high intensity is used for stirring at the beginning and end of smelting, double slag is used for tapping, and a certain amount of synthetic slag is added during the tapping process. The tapping process adopts ferrosilicon, ferromanganese, ferrochrome and ferronickel for deoxidation and alloying in turn, ferroniobium is added at the end of LF alloying, and ferrotitanium is added at the end of RH; argon is blown and stirred during the whole process of molten steel; vacuum degree ≤2mbar, deep vacuum time ≥15min, low superheat casting is adopted, and its superheat ΔT ≤25~35℃, dynamic light pressure is put into use, and the center segregation (C type below 2.0 level) and center looseness (below 0.5 level) of the continuous casting billet are strictly controlled to ensure the quality of the continuous casting billet; the thickness of the billet is 230mm, and its solidification cooling rate is much greater than that of the traditional thick plate billet, and the secondary dendrite spacing is greatly reduced.

8. The manufacturing method according to claim 6 or 7, characterized in that: The rolling process is as follows: slab heating - high-pressure water descaling - fixed width press - E1R1 roughing mill rolling - E2R2 roughing mill rolling - flying shear - high-pressure water descaling - F1-F7 finishing mill rolling - encrypted laminar flow segmented cooling - coiling - pallet transportation system - warehouse stacking slow cooling - sampling and inspection; The slab heating temperature is 1200±20℃; the heating time is 180~240min; the rough rolling mode is 1+5, 3+3 or 3+5; the intermediate billet thickness range is 35~50mm; the finishing rolling start temperature is ≤980℃; the finishing rolling final rolling temperature is 820~850℃, and the front-stage cooling is adopted to achieve the coiling temperature of 500~580℃; the microstructure grain size is ≥11 levels, and the core-surface microstructure grain grade difference is ≤2 levels.

Images