CN116875888A - 一种520MPa级抗氢致开裂石油套管用卷板及其制造方法 - Google Patents
一种520MPa级抗氢致开裂石油套管用卷板及其制造方法 Download PDFInfo
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- 239000003208 petroleum Substances 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 19
- 239000001257 hydrogen Substances 0.000 title claims abstract description 19
- 238000005336 cracking Methods 0.000 title claims abstract description 18
- 229910001562 pearlite Inorganic materials 0.000 claims abstract description 14
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 13
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 10
- 229910052796 boron Inorganic materials 0.000 claims abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims description 25
- 238000009749 continuous casting Methods 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 16
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- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000003723 Smelting Methods 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 6
- 238000006477 desulfuration reaction Methods 0.000 claims description 5
- 230000023556 desulfurization Effects 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
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- 229910000831 Steel Inorganic materials 0.000 abstract description 54
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- 238000005260 corrosion Methods 0.000 description 16
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- 239000011777 magnesium Substances 0.000 description 13
- 239000011572 manganese Substances 0.000 description 13
- 239000006104 solid solution Substances 0.000 description 13
- 229910001566 austenite Inorganic materials 0.000 description 12
- 229910052799 carbon Inorganic materials 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 9
- 229910052758 niobium Inorganic materials 0.000 description 9
- 238000005728 strengthening Methods 0.000 description 9
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 8
- 238000003466 welding Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 6
- 239000010936 titanium Substances 0.000 description 6
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 5
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- 230000009466 transformation Effects 0.000 description 5
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
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- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 101150090128 PCM1 gene Proteins 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
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- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
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- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229910001568 polygonal ferrite Inorganic materials 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/02—Hardening by precipitation
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C21—METALLURGY OF IRON
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- 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
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C21—METALLURGY OF IRON
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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Abstract
本发明涉及石油套管生产技术领域,尤其涉及一种520MPa级抗氢致开裂石油套管用卷板及其制造方法。其化学成分按重量百分比为:C:0.02%~0.045%,Si:0.15%~0.30%,Mn:1.6%~1.9%,P:≤0.015%,S:≤0.004%,Nb:0.06%~0.10%,Ti:0.01%~0.03%,Mg:0.0005%~0.002%,B:0.0008%~0.002%,Mo:0.1%~0.3%,Als:0.02%~0.05%,N:≤0.008%,Pcm低于0.15%,其余为Fe和不可避免元素。材料的焊接性好,抗HIC性能优异,同时保证了钢管具有更好的冲击韧性,防止油井管的脆断,具有更高的安全性。卷板的最终组织为铁素体‑珠光体,珠光体体积分数比例低于3%;A/B/C/D类夹杂物级别1.0级以下,各类和值级别1.5级以下,带状组织0.5级以下。
Description
技术领域
本发明涉及石油套管生产技术领域,尤其涉及一种520MPa级抗氢致开裂石油套管用卷板及其制造方法。
背景技术
石油套管是用于支撑油、气井井壁的钢管,以保证钻井过程进行和完井后整个油井的正常运行,是油气田钻采作业中必不可少的施工材料。HFW(高频焊接)套管与无缝管相比,具有壁厚均匀、尺寸精度高、射孔性能好、抗挤毁能力强、成本低等显著优势,正在逐渐替代传统的无缝钢管。
世界能源需求的日益增长,石油天然气产量逐年增加,石油套管的腐蚀与防护问题也逐渐成为人们普遍关注的重点。油套管的H2S腐蚀已成为油气田面临的主要腐蚀类型,已给油田造成了巨大的经济损失,不但造成停工停产、增加维修费用,而且污染环境,甚至危及生命,开发出具有良好耐腐蚀性的石油套管具有重大社会和经济意义。
抗拉强度为520MPa的卷板,属于API Spec 5CT规定的J55钢级。API Spec 5CT规定:J55级别屈服强度在379-552MPa之间,抗拉强度≥517MPa,伸长率≥24%,冲击功可选择Akv(21℃,横向)≥20J,抗HIC性能按照NACE TM0284规定采用A溶液进行试验,满足CSR≤2%,CLR≤15%,CTR≤5%。为了保证J55直缝焊油套管要求进行电阻焊,所以要求良好的焊接性能,冷裂纹敏感系数Pcm尽可能低;为了保证抗冲击和挤压,需要具有一定的冲击韧性;为了保证抗HIC性能,需要控制夹杂物和组织细小、均匀性程度;为保证强度,需要添加一定合金细化晶粒和提供淬透性。
公开号为CN102260834A的中国专利文献公开了“一种抗H2S腐蚀油井管用热轧钢板及其制造方法”,虽然能够抗H2S腐蚀,但是HFW焊接性差,对铸坯偏析控制不利,不利于HIC性能。公开号为CN109023045A的中国专利文献公开了“一种高抗H2S腐蚀石油油井套管J55的生产方法”,虽然能够抗H2S腐蚀,但是对铸坯偏析控制不利,不利于HIC性能。
综上所述,既要保证抗拉强度为520MPa级别的卷板具有良好的焊接性能,抗SSC性能优异;同时保证钢管具有更好的冲击韧性,成为丞待解决的技术问题。
发明内容
为了克服现有技术的不足,本发明提供一种520MPa级抗氢致开裂石油套管用卷板及其制造方法,材料的焊接性好,抗HIC性能优异,同时保证了钢管具有更好的冲击韧性,防止油井管的脆断,具有更高的安全性。
为了达到上述目的,本发明采用以下技术方案实现:
一种520MPa级抗氢致开裂石油套管用卷板,其化学成分按重量百分比为:
C:0.02%~0.045%,Si:0.15%~0.30%,Mn:1.6%~1.9%,P:≤0.015%,S:≤0.004%,Nb:0.06%~0.10%,Ti:0.01%~0.03%,Mg:0.0005%~0.002%,B:0.0008%~0.002%,Mo:0.1%~0.3%,Als:0.02%~0.05%,N:≤0.008%,Pcm低于0.15%,其余为Fe和不可避免元素。
一种520MPa级抗氢致开裂石油套管用卷板的制造方法,具体包括如下步骤:
1)冶炼:
铁水预处理。
转炉冶炼经顶吹或顶底复合吹炼。
炉外精炼、LF炉轻脱硫处理及进行钙处理。
2)连铸:
板坯连铸制成连铸坯,连铸采用电磁搅拌或动态轻压下。
3)轧制:
连铸板坯经加热炉加热至1150~1250℃,随后采用热机械轧制。
粗轧终轧温度990~1050℃,精轧开轧温度950~980℃,终轧温度860~900℃。
4)冷却:
轧后采用层流冷却,冷却速度为9~14℃/s。
5)卷取:
冷却后进行卷取,卷取温度580~650℃。
卷板的最终组织为铁素体-珠光体,珠光体体积分数比例低于3%;A/B/C/D类夹杂物级别1.0级以下,各类和值级别1.5级以下,带状组织0.5级以下,-20℃冲击功大于150J。
与现有技术相比,本发明至少具有如下技术效果或优点:
1、本发明C含量低,抗HIC性能好。现有的J55普遍采用C含量0.15%以上设计,珠光体含量高,硬度高,抗HIC性能差。当Mn含量高时,Mn偏析产生带状组织,在热轧过程中形成硬度高的珠光体带,严重恶化HIC性能。当C含量低于0.05%时,形成的点状均匀分布的贫珠光体组织,比例低于3%,提升了抗HIC性能。此时还达到了Mn含量的提高并不会恶化抗HIC性能的效果。
2、Mg细化夹杂物,可有效改变夹杂物形态和大小,对HIC性能和冲击有利。镁气泡与钢水界面进行多相脱硫反应;另一方面镁溶解于钢水中并与钢水中的硫发生均相脱硫反应,镁添加后钢中夹杂物弥散细化效果明显,细小弥散的夹杂物能改善HIC敏感性;同时,由于MnS对HIC影响最大,镁与硫反应减少了MnS含量,进一步提高了抗HIC性能。
3、适量的Nb显著细化晶粒,提高热轧态强度。铌缩小γ相区,进入固溶体,固溶强化作用很强,固溶与奥氏体中,显著提高钢的淬透性。可在不影响钢的塑性或韧性的情况下,提高钢的强度。细化晶粒可提高钢的冲击韧性并降低其脆性转变温度。铌达到一定含量以上,可阻止晶粒长大,使得钢材能够在高温区间轧制,仍然获得良好的强度和低温韧性。由于可以固定一定的碳,使钢具有良好的抗氢性能,在奥氏体中,可以防止氧化介质对钢的晶间腐蚀。
4、本发明Pcm低于0.15%,焊接性良好。现有的J55普遍采用C含量0.15%以上,Mn含量1.0%以上,Pcm接近0.25%。Pcm值大于0.25时,冷裂倾向明显增大,可焊性降低。Pcm越低焊接性越好,低于0.15%,焊接性优良。
5、本发明采用低碳中锰高Nb含镁设计,通过提高锰含量和铌含量充分利用固溶强化、细晶强化和沉淀强化,保证了产品的强度和韧性;低碳和含镁解决抗HIC性能;低碳和低Pcm,解决了材料焊接性技术问题。
6、粗轧终轧温度990~1050℃,精轧开轧温度950~980℃,终轧温度860~900℃,冷却速度为9~14℃/s。降低碳含量同时提高铌含量的合金设计,利用固溶铌提高奥氏体的再结晶温度,使控制轧制可以在更高的温度进行,精轧开轧温度达到降低了轧机的负荷生产高强度钢的目的;同时配合合适的轧后冷却制度,利用固溶铌对相变的影响,促进针状铁素体组织的形成,达到最终提高强韧性、焊接性能和抗硫化氢应力腐蚀性能的目标。
具体实施方式
本发明公开了一种520MPa级抗氢致开裂石油套管用卷板及其制造方法。本领域技术人员可以借鉴本文内容,适当改进工艺参数实现。特别需要指出的是,所有类似的替换和改动对本领域技术人员来说是显而易见的,它们都被视为包括在本发明。本发明的方法及应用已经通过较佳实施例进行了描述,相关人员明显能在不脱离本发明内容、精神和范围内对本文所述的方法和应用进行改动或适当变更与组合,来实现和应用本发明技术。
一种520MPa级抗氢致开裂石油套管用卷板,其化学成分按重量百分比为:
C:0.02%~0.045%,Si:0.15%~0.30%,Mn:1.6%~1.9%,P:≤0.015%,S:≤0.004%,Nb:0.06%~0.10%,Ti:0.01%~0.03%,Mg:0.0005%~0.002%,B:0.0008%~0.002%,Mo:0.1%~0.3%,Als:0.02%~0.05%,N:≤0.008%,其余为Fe和不可避免元素。
与现有技术相比,本方案C含量低,HIC性能好;Mg细化夹杂物,可有效改变夹杂物形态和大小,对HIC性能和冲击有利;适量的Ti显著细化晶粒,提高热轧态强度;Pcm低于0.15%,焊接性良好。
以下详细阐述本发明各合金成分作用机理,其中百分符号%代表重量百分比:
C:为碳化物形成元素,是保证强度的最有效元素,可以提高淬透性,保证材料强度和硬度。只有保证足够的碳,才会形成足够的富碳残余奥氏体并能够稳定至室温,最终形成少量均匀细小的珠光体组织。如碳含量过低,无法保证材料的硬度,导致车丝性能差。含量过高,将影响产品的焊接性、塑性和冲击韧性,其最佳范围是0.02%-0.045%。
Si:可以溶入铁素体和奥氏体中,起到一定的固溶强化作用,可显著提高钢的硬度和强度,并提高疲劳强度和疲劳比,但含量过高会显著降低钢的塑性和韧性,其最佳范围是0.15%-0.30%。
Mn:锰具有固溶强化作用,还能增加奥氏体稳定性,对提高淬透性也有利,有效保证钢的强度。锰和铁形成人固溶体,提高钢中铁素体和奥氏体硬度和强度,同时又是碳化物形成元素,进入渗碳体取代一部分铁原子,锰在钢中由于降低临界转变温度,起到细化珠光体作用。但锰含量过大,可增加连铸坯的中心偏析倾向,会使钢板中带状组织增多,最终钢板中会含有一定量的带状组织,使钢板的脆性增加,塑性降低,抗腐蚀性能变差。同时,形成易于形成MnS,对抗HIC性能影响恶劣,其最佳范围是1.6%~1.9%。
P、S、N:是钢中不可避免的杂质元素,希望越低越好,但要求过低会增加生产成本,本发明的P≤0.015%、S≤0.004%、N≤0.006%。
Nb:铌缩小γ相区,进入固溶体,固溶强化作用很强,固溶与奥氏体中,显著提高钢的淬透性;且以碳化物细微颗粒形态存在时,却细化晶粒并降低钢的淬透性,增加钢的回火稳定性,有二次硬化作用。可在不影响钢的塑性或韧性的情况下,提高钢的强度。细化晶粒可提高钢的冲击韧性并降低其脆性转变温度。铌达到一定含量以上,可阻止晶粒长大,使得钢材能够在高温区间轧制,仍然获得良好的强度和低温韧性。由于可以固定一定的碳,使钢具有良好的抗氢性能,在奥氏体中,可以防止氧化介质对钢的晶间腐蚀。由于固定钢中的碳和沉淀硬化作用,可提高钢的高温性能。合适的范围是0.06%~0.10%。
Ti:钛是强的固氮元素,加入0.015%左右Ti时,可在板坯连铸时形成高温稳定细小的TiN析出相,这种细小的TiN析出相可有效阻止连铸坯在加热过程中奥氏体晶粒的长大,同时对改善钢焊接时热影响区的韧性有明显作用。更多的Ti含量,可获得较多的TiC粒子,通过应变诱导析出和相变析出提高钢的强度。同时,析出的TiC产生较强的沉淀强化作用可以保证钢管后续正火热处理晶粒不明显长大,从而保证了整管热处理后的强度满足J55性能要求。其最佳范围是0.01%~0.03%。
Mg:镁有强化学活性,与氧、硫有很强的亲和力,是有效精炼剂,可降低钢中氧、硫含量和夹杂物数量,纯净钢液,还能对钢中夹杂物起到明显的变性作用,改善钢的性能。微量镁可改变硫化物、碳化物、碳氮化物的数量,种类,尺寸,分布。镁处理的夹杂物是混合相,其核心是含镁氧化物,该结构细小弥散分布在钢中,形成符合夹杂物,改善钢材性能和抗腐蚀性能。合适的范围是0.0005%-0.002%。
B:硼能够显著提高淬透性并改善韧性。硼提高淬透性的能力很强,0.001%~0.003%的硼相当于0.6%锰、0.7%铬、0.5%钼和1.5%镍,故可添加少量硼达到替代贵重合金元素的作用。硼含量过高过低,均会影响其淬透性。合适的范围是0.0008%-0.002%。
Mo:钼可以固溶到固溶体中,起到提高强度的作用。Mo元素溶入奥氏体后增大过冷奥氏体的稳定性,使C曲线右移,提高钢的淬透性。Mo能降低相变温度,抑制多边形铁素体形成,促进针状铁素体的转变,提高Nb(C,N)的沉淀强化效果,可同时提高钢的强度和降低韧脆转变温度,提高抗HIC能力。合适的范围是0.10%-0.30%。
Als:铝是常用的脱氧剂,在钢中加入少量的铝,可细化晶粒,提高冲击韧性,本发明的Als含量为0.02%-0.05%。
一种520MPa级抗氢致开裂石油套管用卷板的制造方法,包括铁水预处理、钢水冶炼、炉外精炼和板坯连铸、连铸坯再加热、轧制、冷却、卷取,具体包括如下步骤:
1、冶炼连铸工艺:
铁水预处理,转炉冶炼-经顶吹或顶底复合吹炼,炉外精炼、LF炉轻脱硫处理及进行钙处理以控制夹杂物形态和提高钢的延展性、韧性和冷弯性能,板坯连铸制成连铸板坯-连铸采用电磁搅拌或动态轻压下、以提高连铸板坯的质量。
2、轧制、冷却工艺:
连铸板坯经加热炉加热至1150-1250℃,随后采用热机械轧制。粗轧终轧温度990-1050℃,精轧开轧温度950~980℃,终轧温度860~900℃,该温度范围有利于Nb、Ti析出,细化晶粒尺寸,提高强度和韧性;轧后采用层流冷却,冷却速度为9-14℃/s,该冷却速度下,对细化珠光体有利,减轻带状组织到0.5级以下,可明显提高屈服强度和抗拉强度,同时提高韧性和耐腐蚀性能。冷却后进行卷取,卷取温度580-650℃,该温度范围有利于铁素体组织均匀和细化。
卷板的最终组织为铁素体-珠光体,珠光体体积分数比例低于3%;Pcm低于0.15%,A/B/C/D类夹杂物级别1.0级以下,各类和值级别1.5级以下,带状组织0.5级以下。
【实施例】
一种520MPa级抗氢致开裂石油套管用卷板及其制造方法,具体实施方式如下:
其中表1为实施例卷板的化学成分;表2为实施例加热、轧制、冷却工艺参数;表3为实施例力学性能检测结果。
表1实施例化学成分(wt%)
实施例 | C | Si | Mn | P | S | Nb | Ti | Mg | B | Mo | Als | N | Pcm |
1 | 0.043 | 0.30 | 1.63 | 0.013 | 0.004 | 0.06 | 0.02 | 0.002 | 0.001 | 0.2 | 0.04 | 0.006 | 0.15 |
2 | 0.02 | 0.20 | 1.88 | 0.010 | 0.002 | 0.09 | 0.03 | 0.002 | 0.002 | 0.1 | 0.02 | 0.004 | 0.14 |
3 | 0.02 | 0.15 | 1.70 | 0.009 | 0.002 | 0.07 | 0.01 | 0.001 | 0.002 | 0.3 | 0.03 | 0.005 | 0.13 |
4 | 0.04 | 0.18 | 1.61 | 0.010 | 0.003 | 0.07 | 0.02 | 0.0008 | 0.001 | 0.1 | 0.05 | 0.007 | 0.14 |
5 | 0.03 | 0.22 | 1.65 | 0.011 | 0.003 | 0.10 | 0.02 | 0.002 | 0.002 | 0.3 | 0.04 | 0.006 | 0.14 |
6 | 0.04 | 0.28 | 1.75 | 0.013 | 0.004 | 0.07 | 0.03 | 0.001 | 0.0008 | 0.1 | 0.02 | 0.005 | 0.15 |
7 | 0.03 | 0.18 | 1.82 | 0.009 | 0.001 | 0.08 | 0.01 | 0.002 | 0.002 | 0.2 | 0.03 | 0.004 | 0.15 |
8 | 0.02 | 0.17 | 1.62 | 0.008 | 0.003 | 0.08 | 0.01 | 0.0006 | 0.002 | 0.2 | 0.03 | 0.007 | 0.13 |
表2加热、轧制、冷却工艺参数
表3力学和耐腐蚀性能表
由表1-3可见,采用本发明的成分设计和轧制、卷取工艺,生产出的520MPa级抗H2S腐蚀油套管用卷板,满足API SPEC 5CT标准J55级力学性能和耐腐蚀性能的要求。
以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。
Claims (6)
1.一种520MPa级抗氢致开裂石油套管用卷板,其特征在于,其化学成分按重量百分比为:
C:0.02%~0.045%,Si:0.15%~0.30%,Mn:1.6%~1.9%,P:≤0.015%,S:≤0.004%,Nb:0.06%~0.10%,Ti:0.01%~0.03%,Mg:0.0005%~0.002%,B:0.0008%~0.002%,Mo:0.1%~0.3%,Als:0.02%~0.05%,N:≤0.008%,Pcm低于0.15%,其余为Fe和不可避免元素。
2.一种如权利要求1所述520MPa级抗氢致开裂石油套管用卷板的制造方法,其特征在于,具体包括如下步骤:
1)冶炼:
炉外精炼、LF炉轻脱硫处理及进行钙处理;
2)连铸:
板坯连铸制成连铸坯,连铸采用电磁搅拌或动态轻压下;
3)轧制:
连铸板坯加热至1150~1250℃,随后轧制,
粗轧终轧温度990~1050℃,精轧开轧温度950~980℃,终轧温度860~900℃。
4)冷却:
轧后采用层流冷却,冷却速度为9~14℃/s;
5)卷取:
冷却后进行卷取,卷取温度580~650℃。
3.根据权利要求2所述的一种520MPa级抗氢致开裂石油套管用卷板的制造方法,其特征在于,
所述1)转炉冶炼经顶吹或顶底复合吹炼。
4.根据权利要求2所述的一种520MPa级抗氢致开裂石油套管用卷板的制造方法,其特征在于,
所述2)连铸板坯经加热炉加热至1150~1250℃。
5.根据权利要求2所述的一种520MPa级抗氢致开裂石油套管用卷板的制造方法,其特征在于,
所述3)采用热机械轧制。
6.根据权利要求2所述的一种520MPa级抗氢致开裂石油套管用卷板,其特征在于,卷板的最终组织为铁素体-珠光体,珠光体体积分数比例低于3%;A/B/C/D类夹杂物级别1.0级以下,各类和值级别1.5级以下,带状组织0.5级以下,-20℃冲击功大于150J。
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