JP2023536530A - 高強度長疲労寿命ケーブル用鋼、線材及びその製造方法 - Google Patents
高強度長疲労寿命ケーブル用鋼、線材及びその製造方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 157
- 239000010959 steel Substances 0.000 title claims abstract description 157
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 33
- 229910052729 chemical element Inorganic materials 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims description 24
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical group OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 claims description 17
- 238000005491 wire drawing Methods 0.000 claims description 15
- 238000003723 Smelting Methods 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 14
- 238000005096 rolling process Methods 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 229910001567 cementite Inorganic materials 0.000 claims description 13
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical group C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 claims description 13
- 238000005204 segregation Methods 0.000 claims description 12
- 238000011282 treatment Methods 0.000 claims description 12
- 238000005246 galvanizing Methods 0.000 claims description 11
- 230000009467 reduction Effects 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 229910000734 martensite Chemical group 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 229910001566 austenite Inorganic materials 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 238000009849 vacuum degassing Methods 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000002244 precipitate Substances 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 24
- 239000011651 chromium Substances 0.000 description 13
- 239000000463 material Substances 0.000 description 13
- 239000000203 mixture Substances 0.000 description 10
- 229910001335 Galvanized steel Inorganic materials 0.000 description 7
- 239000008397 galvanized steel Substances 0.000 description 7
- 238000012545 processing Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 238000011056 performance test Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000009749 continuous casting Methods 0.000 description 4
- 238000012937 correction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000006249 magnetic particle Substances 0.000 description 4
- 238000007670 refining Methods 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009661 fatigue test Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 206010003549 asthenia Diseases 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910052702 rhenium Inorganic materials 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
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Abstract
Description
C:0.90~1.00%;
Si:0.90~1.50%;
Mn:0.25~0.58%;
Cr:0.20~1.00%;
V:0.03~0.12%;
Ca:0.0008~0.0025%
を含有する、高強度長疲労寿命ケーブル用鋼を提供する。
C:0.90~1.00%;
Si:0.90~1.50%;
Mn:0.25~0.58%;
Cr:0.20~1.00%;
V:0.03~0.12%;
Ca:0.0008~0.0025%であり、
残部はFe及びその他の不可避不純物である。
B:0.0008~0.0012%;
Re:0.0005~0.008%。
(2)粗圧延;
(3)高速線材圧延;
(4)ステルモア制御冷却;
(5)等温処理:オーステナイト加熱温度が890~1050℃、保持時間が6~20分、等温処理温度が530~600℃である。
本発明による高強度長疲労寿命ケーブル用鋼は、合理的な化学組成の設計により鋼板の性能を確保する。当該高強度長疲労寿命ケーブル用鋼の特性は高強度を確保しながら、良好な塑性と疲労寿命を有し、線材の製造に使用でき、線材が引き抜かれ、亜鉛めっきされた後の鋼線は大スパンで長寿命の橋ケーブルの生産要件を効果的に満たすことができ、良い適用の見通し及び適用価値がある。
実施例1~11の線材はすべて、以下の工程を採用して製造する:
(1)表1に示す化学組成による製錬及び鋳造:電気炉または転炉で製錬した後、炉外精錬を行う。炉外精錬は、LF炉+VDまたはRH脱ガス処理プロセスを採用する。製錬中合成スラグの組成と添加量を調整し、ここで製錬中の真空脱ガス時間が>20分となるように制御する。ブルーム連続鋳造機を使用して角ビレットを鋳造し、鋳造プロセスでは、連続鋳造プロセスでの鋳造速度、冷却、及び終末減量のパラメータを調整することにより、ビレット芯部の炭素偏析が1.08未満になるように制御する。
Claims (15)
- Fe以外に、質量百分率で以下の各化学元素:
C:0.90~1.00%;
Si:0.90~1.50%;
Mn:0.25~0.58%;
Cr:0.20~1.00%;
V:0.03~0.12%;
Ca:0.0008~0.0025%
を含有する、高強度長疲労寿命ケーブル用鋼。 - 各化学元素の質量百分率が、
C:0.90~1.00%;
Si:0.90~1.50%;
Mn:0.25~0.58%;
Cr:0.20~1.00%;
V:0.03~0.12%;
Ca:0.0008~0.0025%であり、
残部がFe及びその他の不可避不純物である、請求項1に記載の高強度長疲労寿命ケーブル用鋼。 - 各化学元素の質量百分率がSi:1.0~1.4%、Cr:0.2~0.7%の少なくとも1つを満たす、請求項1又は2に記載の高強度長疲労寿命ケーブル用鋼。
- その他の不可避的不純物の総含有量は0.10%以下であり、各不純物元素の含有量はそれぞれCu≦0.05%、Al≦0.004%、Ti≦0.003%、P≦0.015%、S≦0.010%、O≦0.0025%、N≦0.0045%の少なくとも1つを満たす、請求項2に記載の高強度長疲労寿命ケーブル用鋼。
- 以下の化学元素:
Mo:0.10~0.80%;
B:0.0008~0.0012%;
Re:0.0005~0.008%、
の少なくとも1つを含む、請求項1又は2に記載の高強度長疲労寿命ケーブル用鋼。 - ミクロ組織は主に微細化されたソルバイト組織であり、ソルバイトの相比率が≧95%であり、ミクロ組織に粒界ネットワークセメンタイトとマルテンサイト組織の相比率が≦0.5%であり;好ましくは、前記ソルバイト組織のラメラ間隔の平均値が40~260nmであり;好ましくは、前記ミクロ組織中にもサイズが5~50nmであるVの炭窒化物析出物を有し;好ましくは、前記ミクロ組織において介在物のサイズが<35μmであり、介在物のアスペクト比が>2である、ことを特徴とする請求項1又は2に記載の高強度長疲労寿命ケーブル用鋼。
- 芯部の炭素偏析が1.08未満である、ことを特徴とする請求項6に記載の高強度長疲労寿命ケーブル用鋼。
- 前記高強度長疲労寿命ケーブル用鋼の引張強度が≧1430MPaである、ことを特徴とする請求項1に記載の高強度長疲労寿命ケーブル用鋼。
- 請求項1~8のいずれか一項に記載の高強度長疲労寿命ケーブル用鋼を用いて得られる線材であり、好ましくは、前記線材の性能は、引張強度≧1430MPa、減面率>30%、伸線と亜鉛めっき後の鋼線の引張強度≧2000MPa、ねじり値>8回、最大応力0.45σbの条件での疲労寿命>240万回の少なくとも1項を満たす、線材。
- 請求項9に記載の線材を伸線、亜鉛めっき、安定化処理して得られる鋼線であり、好ましくは、前記鋼線は引張強度が≧2000MPa、100Dゲージサンプルのねじり値が>8回、最大応力0.45σbの条件での疲労寿命が>240万回であり、好ましくは、前記鋼線は引張強度が2020~2100MPa、100Dゲージサンプルのねじり値が12~24回であり、最大応力0.45σbの条件での疲労寿命が249~420万回である、鋼線。
- 以下の工程:
(1)製錬および鋳造;
(2)粗圧延;
(3)高速線材圧延;
(4)ステルモア制御冷却;
(5)等温処理:オーステナイト加熱温度が890~1050℃、保持時間が6~20分、等温処理温度が530~600℃である、
を含む、請求項9に記載の線材の製造方法。 - 工程(1)において、製錬プロセス中に真空脱ガス時間>20分になるように制御し、鋳造プロセス中にビレット芯部における炭素偏析が1.08未満になるように制御する、ことを特徴とする請求項11に記載の製造方法。
- 工程(2)において、2回焼成成形プロセスを用い、連続鋳造ビレットを粗圧延し、1100~1250℃の温度で150~250mm角のビレットに分塊圧延し;その後に加熱炉に入れて加熱し、加熱温度を960~1150℃に制御し、保持時間を1.5~2.5時間に制御する、ことを特徴とする請求項11に記載の製造方法。
- 工程(3)において、圧延速度を20~60m/sに制御し;好ましくは、仕上圧延機の入口温度を920~990℃、絞り・サイジング機の入口温度を920~990℃、吐糸温度を880~950℃に制御する、ことを特徴とする請求項11に記載の製造方法。
- 工程(4)において、14個のステルモアファンの風量調整範囲は、F1~F8ファンの風量が80~100%、F9~F12ファンの風量が75~100%、F13~F14ファンの風量が0~45%である、ことを特徴とする請求項11に記載の製造方法。
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