WO2012113119A1 - 一种x90钢级弯管和管件的制备方法 - Google Patents

一种x90钢级弯管和管件的制备方法 Download PDF

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WO2012113119A1
WO2012113119A1 PCT/CN2011/000947 CN2011000947W WO2012113119A1 WO 2012113119 A1 WO2012113119 A1 WO 2012113119A1 CN 2011000947 W CN2011000947 W CN 2011000947W WO 2012113119 A1 WO2012113119 A1 WO 2012113119A1
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Prior art keywords
pipe
steel
heated
pipe fittings
tempering
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PCT/CN2011/000947
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English (en)
French (fr)
Inventor
冯耀荣
刘迎来
牛靖
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中国石油天然气集团公司
中国石油天然气集团公司管材研究所
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Publication of WO2012113119A1 publication Critical patent/WO2012113119A1/zh

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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
    • C22C38/02—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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L43/00—Bends; Siphons
    • F16L43/001—Bends; Siphons made of metal
    • F16L43/002—Bends; Siphons made of metal and formed from sheet having a circular passage

Definitions

  • the present invention relates to a method for preparing a bent pipe and a pipe fitting having a strength grade of X90 steel grade and excellent toughness, and the bent pipe and the pipe fitting are suitable for a large-diameter high-pressure gas pipeline project.
  • the connection between the main line and the station line. BACKGROUND OF THE INVENTION
  • a large number of station steel pipes, elbows and pipe fittings are required for the gas station, the gas distribution station and the valve chamber.
  • the limit temperature of the station reaches - 30 ⁇ - 40 °C, and some stations have a minimum temperature of -46 °C and a thickness of 50-70 mm.
  • some of the station steel pipes, elbows and pipe fittings need to be exposed to the cold external environment, which is a severe challenge to the material's ability to resist brittle fracture.
  • Specially selected X90 grade yield strength 625MPa
  • its yield strength exceeds the highest steel grade (490MPa) of low temperature pressure vessel steel, and the sensitivity of low temperature brittle fracture is relatively improved.
  • the object of the present invention is to provide an X90 steel grade elbow and pipe fitting with high strength, high toughness and good splicing performance, suitable for -35 ⁇ - 50 °C, thickness of 15-70 ⁇ , diameter 508mm- 1422mm, the elbow and pipe fittings supporting the construction of oil and gas pipelines, to meet the needs of major oil and gas pipeline construction.
  • the chemical composition In order to ensure the strength, low temperature toughness and weldability of the elbow and pipe fittings, the chemical composition must be rationally designed. In order to make the pipe and pipe parts have good process performance, comprehensive mechanical properties Stable, using Mn-Nb-Mo alloy system, and ensuring the material hardenability meets the design requirements during the design of the elbow and the tube parent tube, and reasonable control of C equivalent.
  • the X90 elbow and pipe component design in the present invention mainly considers the following aspects: First, the use of low carbon microalloyed steel, in the case of ensuring weldability, the C content is appropriately increased compared with the main pipe.
  • the second is to add a strong carbide forming element such as Mo to improve the hardenability of the material.
  • the third is to make full use of the solid solution strengthening of Ni in the steel and the precipitation strengthening of the microalloying elements such as b, V, Ti, etc., so that the original austenite grains are kept refined to ensure the steel plate is spliced and heatd several times.
  • the grain is fine after processing and quenching and tempering heat treatment.
  • the weld bead performance is strictly required, so the coffin and welding process must be strictly required.
  • the low-temperature toughness of the quilted metal in the welded state is achieved by the fine-grained acicular ferrite containing Ti-B bismuth metal.
  • the welded structure is destroyed by further deformation and quenching heat treatment, resulting in a decrease in the toughness of the weld metal.
  • it is necessary to reduce the oxygen content in the weld metal so it is necessary to use a special welding material (low oxygen welding material).
  • a special welding material low oxygen welding material
  • the steel for X90 elbow and pipe fittings with excellent comprehensive performance of the present invention and a manufacturing method thereof have the following main points:
  • Nb may be added: 0.035 ⁇ 0.11%; Ti: 0.02 ⁇ 0.06%; V: 0.03 ⁇ 0.07% of one or more alloying elements, Nb +V+Ti ⁇ 0.15%; an alloying element such as 0.15 to 0.5% of Mo, 0.15 to 1.5% of Ni, and 0.15 to 0.60% of Cr may be added. Simultaneously control Mo/P ⁇ 10 to reduce segregation and temper brittleness.
  • the carbon equivalent is 0.41-0.62%. The specific components can be adjusted depending on the thickness.
  • the above materials are spheroidized by oxygen blowing converter, ⁇ Si-Ca wire to spheroidize the inclusions in the steel, and then transferred to the refining furnace to remove harmful impurities such as 8, P, and then removed in the vacuum furnace, 0, N, H, etc. Harmful gas, using electromagnetic stirring (reduced segregation) in continuous casting and continuous casting process to make thick slab, heated to 1200 ° C, 1000 ° C ⁇ 1100 ° C rough rolling, 700 ° C ⁇ 950 ° C finishing rolling , After rolling, the cooling rate is 20 ° C ⁇ 50 ° C / s, made of hot-rolled steel.
  • the steel plate is formed by UO (pressing the steel plate into a U-shape by a press and then pressing it into an O-shape), or JCO molding (first press the edge of the steel plate into a J-shape with a press, then press it into a U-shape, and then press it into a O-shape. Type), or RB molding
  • the welding consumables are made of fine grain acicular ferrite low oxygen content material containing Ti-B, and then expanded by 0.6-1.5% to make straight seam. Submerged arc welded steel pipe.
  • the tube obtained by the (2) process is heated by 930-1030 °C to make a 10-90° bend, and is sprayed with water inside and outside the tube to cool, then heated to 580-700 ° C, 2-3 Hours of tempering, water cooling after tempering (reduced temper brittleness).
  • Manufacturing process The above materials are smelted by oxygen blowing converter, Ca treatment, refining outside the furnace and vacuum removal Gas, using electromagnetic stirring (reduced segregation) in continuous casting and continuous casting process to make a thick slab of about 250mm, heated to about 1200 °C, 1000 ° C ⁇ 1100 ° C rough rolling, 700 ° C ⁇ 950 After finishing at °C, the cooling rate after rolling is 20 ° C ⁇ 30 ° C / S , and a hot rolled steel sheet having a thickness of about 30 mm is produced.
  • the steel plate is formed by JCO molding, and multi-pass straight seam submerged arc welding is used.
  • the welding consumables are made of fine grain acicular ferrite low oxygen content material containing Ti-B, and then expanded by 0.8-1.2% to make straight seam.
  • Submerged arc welded steel pipe The welded pipe is heated by 930-1030 °C and made into a 90° elbow. At the same time, it is sprayed with water and cooled inside and outside the pipe, then heated to 630 ⁇ 15° (2 hours, tempered for 2 hours, and tempered and water cooled).
  • the X90 induction heating elbow with thickness of about 30mm and diameter of 1219mm produced by the invention has high strength, good low temperature toughness and splicing, and can meet the on-site welding construction and oil and gas transmission of -35 ⁇ - 50°C. Requires that the performance of all parts of the elbow is uniform. Yield strength 675Mpa, tensile strength 731Mpa, yield ratio 0.92, elongation 29%, -46 °C Charpy impact toughness
  • Alloy composition C: 0.15%; Mn: 1.63%; Si: 0.37%; P: 0.010%; S: 0.004%; Al: 0.03%; Ca: 0.003%; N: 0.007%; Nb: 0.08%; Ti: 0.04%; Mo: 0.26%; Ni: 0.57%; Cr: 0.19%; balance is Fe and unavoidable impurities. Carbon equivalent 0.55%.
  • Electromagnetic stirring (reduced segregation) in continuous casting and continuous casting is used to make a thick slab of about 250 mm and heated to Approximately 1200 ° C, 1000 ° C ⁇ 1100 ° C rough rolling, 700 ° C ⁇ 950 ° C finishing rolling, after rolling cooling speed 25 ° C ⁇ 35 ° C / s, to a thickness of about 52 mm hot rolled steel.
  • the steel plate is further formed by UO, straight seam submerged arc welding.
  • the coffin is made of fine grain acicular ferrite low oxygen content material containing Ti-B, and then expanded by 0.8-1.2% to make straight seam submerged arc welded steel pipe. .
  • the welded pipe is heated by 1100-1200 °C and repeatedly thermomechanically formed into a tee, then heated to 950 ⁇ 15 ° C, held for 1.5 hours, water quenched, then heated to 650 ⁇ 15 ° C, 2.5 hours tempered, back The water is cold after the fire.
  • the X90 tee with a thickness of about 52 awake and a diameter of 1219x1219x1219mm is produced by the invention, and has high strength, good low temperature toughness and splicing, and can meet the on-site splicing construction and oil and gas transportation of -35 ⁇ - 50°C. Requirements, the performance of each part of the three links is even. Yield strength 689Mpa, tensile strength 752Mpa, yield ratio 0.92, elongation 27%, -46 °C Charpy impact toughness
  • Alloy composition C: 0.18%; Mn: 1.75%; Si: 0.39%; P: 0.008%; S: 0.005%; Ah 0.04%; Ca: 0.003%; N: 0.006%; Nb: 0.07%; Ti: 0.04 %; V: 0.03%; Mo: 0.38%; Ni: 0.59%; Cr: 0.29%; balance is Fe and unavoidable impurities.
  • the carbon equivalent is 0.62%.
  • Electromagnetic stirring (reduced segregation) in continuous casting and continuous casting is used to make a thick slab of about 250 mm and heated to Approximately 1200 ° C, 1000 ° C ⁇ 1100 ° C rough rolling, 700 ° (: ⁇ 950 ° C finishing rolling, rolling cooling rate of 25 ° C ⁇ 35 ° C / s, made of a thickness of about 65 mm hot-rolled steel.
  • the steel plate is formed by JCO, and the straight seam is submerged arc.
  • the welding consumables are made of fine grain acicular ferrite low oxygen content material containing Ti-B.
  • the welded pipe is heated by 1100-1200 °C and repeatedly thermomechanically formed into a tee, then heated to 980 ⁇ 15 ° C, kept for 100 min, water quenched, and then heated to 670 ⁇ 15 ° C, 3 hours. Tempered, water cooled after tempering.
  • the X90 tee with a thickness of about 65 paintings and a diameter of 1219x1219x1219mm is produced by the invention, and has high strength, good low temperature toughness and weldability, and can meet the requirements of -35 ⁇ - 50 °C on-site construction and oil and gas transportation.
  • the performance of each part of the three links is even. Yield strength 689Mpa, tensile strength 743Mpa, yield ratio 0.93, elongation 28%, -46 °C Charpy impact toughness 76-248 J 0
  • the invention can produce X90 elbows and pipe fittings with a diameter of 508mm - 1422mm, wherein the curved pipe wall Thickness of 15-35mm, pipe wall thickness of 30-70mra, and high strength, good low temperature toughness and weldability, can meet the requirements of -35 ⁇ - 50 °C on-site construction and oil and gas transmission, performance of various parts of elbow and pipe fittings Evenly. Yield strength 625-775Mpa, tensile strength 695-915 Mpa, yield ratio 0.93, elongation ⁇ 25°/. , -35 ⁇ - 50°C Charpy impact toughness of 60-300J.

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  • Mechanical Engineering (AREA)
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  • Metallurgy (AREA)
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Description

一种 X90钢级弯管和管件的制备方法 技术领域 本发明涉及一种强度级别达到 X90钢级 、韧性优良的弯管和管件的 制备方法， 弯管和管件适用于大口径高压输气管道工程干线和站场管线 的连接。 背景技术 我国大口径高压输气管道建设中， 压气站和输配气站场及阀室， 需要 大量站场钢管、 弯管和管件。 站场极限温度达到- 30~- 40°C， 有的站场最 低气温低于- 46°C， 厚度达到 50-70mm。 根据管道工艺设计要求， 部分站 场钢管、 弯管和管件需裸露在寒冷的外部环境下服役， 对材料抗脆性起 裂能力是一个严峻的挑战。特别选用 X90 钢级（屈服强度 625MPa)， 其 屈服强度超过了目前低温压力容器钢的最高钢级水平（490MPa)， 低温脆 断的敏感性相对提高。 目前我国还不能生产冲击韧性达到 -30°C及以下温 度平均夏比冲击韧性不低于 50J、最小值不低于 40J的弯管和管件，特别 是壁厚较大时更是如此， 难于保障 -30°C以下低温环境管道安全性要求， 迫切需要兼备高强度和优良低温韧性的弯管和管件用钢及制造工艺。 发明内容 本发明的目的是提供一种具备高强度、 高韧性、 良好悍接性能的 X90 钢级弯管和管件， 适用于 -35〜- 50 °C， 厚度达到 15-70πυη， 管径 508mm-1422mm, 与油气管道建设配套的弯管和管件产品， 满足重大油气 管道工程建设需求。
为了保证弯管和管件的强度、低温韧性、 焊接性， 必须对其化学成分 进行合理设计。 为了使弯管和管件具有良好的工艺性能， 综合机械性能 稳定， 采用 Mn-Nb-Mo合金体系， 并在弯管和管件母管成分设计时确保材 料淬透性达到设计要求， 并对 C当量进行合理控制。
本发明中的 X90弯管和管件成分设计主要考虑以下几个方面：一是采 用低碳微合金钢，在确保可焊性的情况下， C含量与干线管相比适当增加。 二是填加 Mo等强碳化物形成元素， 提高材料淬透性。 三是充分利用钢中 Ni的固溶强化和微合金化元素 b、 V、 Ti等碳氮化物的沉淀强化， 使原 奥氏体晶粒保持细化， 以保证钢板在悍接、 多次热加工和淬火、 回火热 处理后晶粒细小。
弯管和管件由于要进行热加工， 对焊缝性能有严格要求， 所以必须对 悍材及焊接工艺严格要求。 通常焊接状态悍缝金属的低温韧性依靠含 Ti - B悍接金属的细晶粒针状铁素体来达到。 弯管和管件制造过程中， 焊 态组织由于进一步的变形和淬火热处理而破坏， 造成焊缝金属韧性下降。 为了改善热处理后焊缝金属的韧性， 必须降低焊缝金属中的氧含量， 所 以必须采用专们的焊接材料（低氧焊材）。 同时， 对悍接道次和热输入量 进行严格控制， 防止晶粒长大， 为后续的热加工准备好条件。
本发明的一种具有优良综合性能的 X90弯管和管件用钢及其制造方 法， 其要点如下：
( 1 )本发明的一种具有优良综合性能的 X90弯管和管件用钢的质量 百分比组成如下：
C: 0.1卜 0.25%; Mn: 1.35〜2%； Si: 0.3〜0.5%； P^O.010%; 0.005%, Ah 0.01—0.05%； Ca 0.002-0.005%, 0.008%, Ah N^2: 1 , 余量为 Fe; 在此基础上还可添加质量百分比 Nb: 0.035〜0.11%； Ti: 0.02〜0.06%； V： 0.03〜0.07%中的一种或两种以上的合金元素， Nb+V+Ti^0.15%;还可添加 0.15〜0.5%的 Mo， 0.15〜1.5%的 Ni， 0.15〜 0.60%的 Cr等合金元素。 同时控制 Mo/P≥10， 以减小偏析和回火脆性。 碳当量 0.41-0.62%。 具体成分根据厚度的不同可进行调整。
(2) 上述材料经氧吹转炉熔炼、 煨 Si-Ca丝对钢中夹杂物进行球化 处理， 再转入精炼炉脱8、 P等有害杂质， 之后在真空炉脱 0、 N、 H等 有害气体， 采用连续铸造及连铸过程中的电磁搅拌（减小偏析） 制成厚 板坯， 加热至 1200°C， 1000°C~1100°C粗轧， 700°C~950°C精轧， 轧后冷 却速度 20°C~50°C/s， 制成热轧钢板。钢板经 U-O成型（用压力机将钢板 先压制成 U型、 接着压制成 O型）， 或 J-C-O成型（首先用压力机将钢 板边部压制成 J型、 接着压制成 U型、 然后压制成 O型）， 或 R-B成型
(钢板滚压弯曲成型）， 然后进行直缝埋弧焊接， 焊材采用含 Ti-B的细 晶粒针状铁素体低氧含量材料， 然后经 0.6-1.5%扩径， 制成直缝埋弧焊 接钢管。
(3 )经（2)工艺所得悍管经过 930-1030°C感应加热煨制成 10-90° 的弯管， 同时在管子内外喷水冷却， 然后加热至 580-700°C、 2-3小时回 火， 回火后水冷（减小回火脆性）。
(4)经（2)工艺所得悍管经过 1050-1200°C加热及多次热机械成型 制成管件， 然后加热至 900-1000°C， 保温 0.5-2小时、 水淬， 后加热至 580-700° (：、 2-3小时回火， 回火后水冷（减小回火脆性）。 具体实施方式 实施例 1 :
合金成分： C: 0.11%； Mn: 1.65%； Si: 0.32%； P: 0.009%； S: 0.003%； Ah 0.03%； Ca: 0.003%； N: 0.007%； Nb: 0.07%； Ti: 0.03%； Mo: 0.25%； Ni: 0.33%； Cr: 0.27%； 余量为 Fe和不可避免的杂质。 碳当量 0.46%
制造工艺： 上述材料经氧吹转炉熔炼、 Ca处理， 炉外精炼和真空脱 气，采用连续铸造及连铸过程中的电磁搅拌（减小偏析）制成约为 250mm 的厚板坯， 加热至约 1200 °C , 1000°C~1100°C粗轧， 700°C~950°C精轧， 轧后冷却速度 20°C~30°C/S， 制成厚度约为 30mm 热轧钢板。 钢板再经 J-C-O成型， 采用多道次直缝埋弧焊接， 焊材采用含 Ti- B的细晶粒针状 铁素体低氧含量材料， 然后经 0.8-1.2%扩径， 制成直缝埋弧焊接钢管。 焊管经过 930-1030°C感应加热煨制成 90°的弯管，同时在管子内外强力喷 水冷却， 然后加热至 630±15° ( 、 2小时回火， 回火后水冷。
性能特点： 采用本发明生产的厚度约为 30mm、管径 1219mm的 X90感应 加热弯管， 兼备高强度、 良好低温韧性和悍接性， 可满足 -35〜- 50°C现场 焊接施工和油气输送要求， 弯管各个部位性能均匀。 屈服强度 675Mpa， 抗拉强度 731Mpa， 屈强比 0.92， 伸长率 29%， -46 °C的夏比冲击韧性达到
Figure imgf000005_0001
实施例 2:
合金成分： C: 0.15%； Mn: 1.63%； Si: 0.37%； P: 0.010%； S: 0.004%； Al: 0.03%； Ca: 0.003%； N: 0.007%； Nb: 0.08%； Ti: 0.04%； Mo: 0.26%； Ni: 0.57%； Cr: 0.19%； 余量为 Fe和不可避免的杂质。 碳当量 0.55%。
制造工艺： 上述材料经氧吹转炉熔炼、 Ca处理， 炉外精炼和真空脱 气，采用连续铸造及连铸过程中的电磁搅拌（减小偏析）制成约为 250mm 的厚板坯， 加热至约 1200 °C， 1000°C~1100°C粗轧， 700°C~950°C精轧， 轧后冷却速度 25°C~35°C/s， 制成厚度约为 52mm热轧钢板。 钢板再经 U-O成型， 直缝埋弧焊接， 悍材采用含 Ti-B的细晶粒针状铁素体低氧含 量材料， 然后经 0.8-1.2%扩径， 制成直缝埋弧焊接钢管。 焊管经过 1100-1200°C加热及多次热机械成型制成三通， 然后加热至 950±15°C， 保 温 1.5小时、 水淬， 后加热至 650±15°C、 2.5小时回火， 回火后水冷。 性能特点：采用本发明生产的厚度约为 52醒、管径 1219x1219x1219mm 的 X90三通， 兼备高强度、 良好低温韧性和悍接性， 可满足 - 35~- 50°C现 场悍接施工和油气输送要求， 三通各个部位性能均匀。 屈服强度 689Mpa， 抗拉强度 752Mpa， 屈强比 0.92， 伸长率 27%， -46 °C的夏比冲击韧性达到
Figure imgf000006_0001
实施例 3:
合金成分： C: 0.18%； Mn: 1.75%； Si: 0.39%； P: 0.008%； S: 0.005%； Ah 0.04%； Ca: 0.003%； N: 0.006%； Nb: 0.07%； Ti: 0.04%； V： 0.03%； Mo: 0.38%； Ni: 0.59%； Cr: 0.29%; 余量为 Fe和不可避免的杂质。 碳 当量 0.62%。
制造工艺： 上述材料经氧吹转炉熔炼、 Ca处理， 炉外精炼和真空脱 气，采用连续铸造及连铸过程中的电磁搅拌（减小偏析）制成约为 250mm 的厚板坯， 加热至约 1200 °C , 1000°C~1100°C粗轧， 700° (：〜 950°C精轧， 轧后冷却速度 25°C~35°C/s， 制成厚度约为 65mm热轧钢板。 钢板再经 J-C-O成型， 直缝埋弧悍接， 焊材采用含 Ti-B的细晶粒针状铁素体低氧 含量材料， ^^后经 0.8-1.2%扩径， 制成直缝埋弧悍接钢管。 焊管经过 1100-1200°C加热及多次热机械成型制成三通， 然后加热至 980±15°C， 保 温 100min、 水淬， 后加热至 670±15°C、 3小时回火， 回火后水冷。
性能特点：采用本发明生产的厚度约为 65画、管径 1219x1219x1219mm 的 X90三通， 兼备高强度、 良好低温韧性和焊接性， 可满足 - 35〜- 50°C现 场悍接施工和油气输送要求， 三通各个部位性能均匀。 屈服强度 689Mpa， 抗拉强度 743Mpa， 屈强比 0.93， 伸长率 28%， -46 °C的夏比冲击韧性达到 76-248 J0
工业实用性
采用本发明可生产管径 508mm- 1422mm的 X90弯管和管件，其中弯管壁 厚 15-35mm， 管件壁厚达到 30-70mra， 且兼备高强度、 良好低温韧性和焊 接性， 可满足 -35〜- 50°C现场悍接施工和油气输送要求， 弯管和管件各个 部位性能均匀。 屈服强度 625- 775Mpa， 抗拉强度 695-915 Mpa, 屈强比 0.93， 伸长率≥25°/。， -35~- 50°C的夏比冲击韧性达到 60- 300J。

Claims

1， 一种 X90钢级弯管和管件的制备方法， 其特征在于：
( 1 ) X90钢级弯管和管件用钢的质量百分比组成如下：
C: 0.1卜 0.25%; Mn: 1.35〜2%； Si: 0.3〜0.5%； P^O.010%; 0.005%, Al: 0.01〜0.05%； Ca 0.002-0.005%, N^O.008%, Al: N^2: 1，余量为 Fe;或在上述组分基础上按质量百分比添加 Nb: 0.035〜0.11%； Ti: 0.02〜0.06%； V： 0.03〜0.07%中的一种或两种以上的合金元素， Nb+V+Ti^0.15%; 或添加 0.15〜0.5%的 Mo， 0.15〜1.5%的 Ni， 0.15〜 0.60%的 Cr合金元素； 同时控制 Mo/P≥10， 碳当量 0.41-0.62%;
(2)上述材料经氧吹转炉熔炼、 煨 Si-Ca丝对钢中夹杂物进行球化 处理， 再转入精炼炉脱8、 P有害杂质， 之后在真空炉脱 0、 N、 H有害 气体， 采用连续铸造及连铸过程中的电磁搅拌制成厚板坯， 加热至 1200 °C， 恒温， 1000°C~1100°C粗轧， 700°C~950°C精轧， 轧后冷却速度 20°C ~50°C/s,制成热轧钢板，钢板经 U-O成型，或 J-C-O成型，或 R-B成型， 然后进行直缝埋弧焊接， 焊材采用含 Ti-B的细晶粒针状铁素体低氧含量 材料， 然后经 0.6-1.5%扩径， 制成直缝埋弧焊接钢管；
(3 )经（2) 工艺所得悍管经过 930-1030°C感应加热煨制成 10-90° 的弯管， 同时在管子内外喷水冷却， 然后加热至 580-700°C、 2-3小时回 火， 回火后水冷；
(4)经（2)工艺所得悍管经过 1050-1200°C加热及多次热机械成型 制成管件， 然后加热至 900-1000°C， 保温 0.5-2小时、 水淬， 后加热至 580-700 °C . 2-3小时回火， 回火后水冷。
PCT/CN2011/000947 2011-02-22 2011-06-03 一种x90钢级弯管和管件的制备方法 WO2012113119A1 (zh)

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