JP6744601B1 - 無方向性電磁鋼板 - Google Patents
無方向性電磁鋼板 Download PDFInfo
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- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 title claims abstract description 23
- 239000013078 crystal Substances 0.000 claims abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 9
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 14
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 53
- 229910052742 iron Inorganic materials 0.000 abstract description 25
- 229910000831 Steel Inorganic materials 0.000 description 29
- 239000010959 steel Substances 0.000 description 29
- 230000000694 effects Effects 0.000 description 16
- 238000000034 method Methods 0.000 description 14
- 230000004907 flux Effects 0.000 description 12
- 238000000137 annealing Methods 0.000 description 11
- 230000007423 decrease Effects 0.000 description 11
- 238000005096 rolling process Methods 0.000 description 11
- 239000000047 product Substances 0.000 description 10
- 239000012299 nitrogen atmosphere Substances 0.000 description 8
- 239000011162 core material Substances 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 7
- 238000009661 fatigue test Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 229910000976 Electrical steel Inorganic materials 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 238000009849 vacuum degassing Methods 0.000 description 5
- 229910052720 vanadium Inorganic materials 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 238000009864 tensile test Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000000576 coating method Methods 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 3
- 229910052738 indium Inorganic materials 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 229910001651 emery Inorganic materials 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
Description
<実験1>
まず、疲労強度に及ぼす結晶粒径の影響を調査するため、C:0.0018mass%、Si:3.4mass%、Mn:0.6mass%、P:0.01mass%、S:0.002mass%、Al:0.9mass%、N:0.0013mass%、Zn:0.0012mass%およびO:0.0020mass%を含有する鋼を実験室にて溶解し、鋳造して鋼塊とした後、熱間圧延して板厚2mmの熱延板とした。ついで、この熱延板に100vol%N2雰囲気下で1000℃×30sの熱延板焼鈍を施した後、酸洗し、冷間圧延して板厚0.25mmの冷延板とし、20vol%H2−80vol%N2雰囲気下で、均熱時間を10sとし、均熱温度を650〜1000℃の範囲で種々に変化させて仕上焼鈍を施した。
次に、製造性を調査するため、C:0.0020mass%、Si:3.5mass%、Mn:0.4mass%、P:0.01mass%、S:0.001mass%、Al:0.7mass%、N:0.0016mass%およびZn:0.0011mass%を含有する鋼を実験室にて10チャージ分を溶解し、鋳造して鋼塊とした後、熱間圧延して板厚2mmの熱延板とした。ついで、この熱延板に100vol%N2雰囲気下で1000℃×30sの熱延板焼鈍を施した後、酸洗し、冷間圧延して板厚0.25mmの冷延板とし、20vol%H2−80vol%N2雰囲気下で、800℃×10sの仕上焼鈍を施した。
次いで、Znが引張強さTSのバラツキに及ぼす影響を調査する実験を行った。
Znは、蒸気圧が高いため、通常は鋼中に混入しない元素であるが、精錬工程で脱酸後の溶鋼に温度調整等を目的としてスクラップを添加したときに混入することがある。一般の低強度の電磁鋼板では、十分に粒成長させているため、Znが混入しても強度特性に大きな影響を与えないが、本発明が対象としている高強度電磁鋼板のように結晶粒が微細な材料では、強度がばらつく原因となると考えられる。
本発明は、上記した新規な知見に基づき開発したものである。
C:0.005mass%以下
Cは、炭化物を形成して析出し、鉄損を増大する有害元素であるため、0.005mass%以下に制限する。好ましくは0.003mass%以下である。
Siは、鋼板の固有抵抗を高めて鉄損を低減するのに有効な元素であるので、3mass%以上含有させる。一方、5mass%を超えると、飽和磁束密度の低下に伴い磁束密度も低下するため、上限は5mass%とする。好ましくは3.5〜4.5mass%の範囲である。
Mnは、鋼板の固有抵抗を高めるのに有効な元素であるが、5mass%を超えると磁束密度が低下するので、上限を5mass%とする。好ましくは2mass%以下である。Mnの下限は、特に規定しないが、熱間加工性および鉄損を改善する観点から、0.1mass%以上含有させるのが好ましい。
Pは、鋼の強度を高めて打抜き性を改善するのに有効な元素であるが、0.1mass%を超えて添加すると、鋼が脆化し、冷間圧延することが困難となるため0.1mass%以下に制限する。好ましくは0.002〜0.01mass%の範囲である。
Sは、MnとMnSを形成して析出し、鉄損を増大させる有害元素であり、特に、0.01mass%を超えると上記弊害が顕著となる。よって、Sは0.01mass%以下に制限する。好ましくは0.005mass%以下である。
Alは、Siと同様、固有抵抗を高めて、鉄損を低減するのに有効な元素であるが、3mass%を超えると、飽和磁束密度の低下に伴い磁束密度も低下するため、3mass%以下に制限する。好ましくは2mass%以下である。なお、Alの下限は特に規定しないが、鉄損を改善する観点からは、0.3mass%以上が好ましく、0.5mass%以上がより好ましい。
Nは、窒化物を形成して析出し、鉄損を増大させる有害元素であり、特に0.005mass%を超えると、上記弊害が顕著となる。よって、Nは0.005mass%以下に制限する。好ましくは0.002mass%以下である。
Znは、先述したように、再結晶挙動の変動を介して、引張強度のバラツキを増大させる有害元素であり、引張強度のバラツキを低減する観点から、本発明では0.003mass%以下に制限する。好ましくは0.002mass%以下である。なお、上記の観点ではZn含有量は少ない程が好ましいが、Znの微量添加は窒化を抑制して鉄損を改善する効果もある。また、過度の低減は、使用する原料やスクラップを厳選する必要がり、コストアップとなるため、Znの下限は0.0005mass%程度とする。
Cr:0.1〜5mass%
Crは、Siと同様、固有抵抗を高めて、鉄損を低減するのに有効な元素であるので、0.1mass%以上含有させることが好ましい。しかし、5mass%を超える添加は、飽和磁束密度の低下に伴い磁束密度も低下するため、5mass%以下で添加するのが好ましい。
Caは、CaSを形成してSを固定し、鉄損低減に寄与する元素であるため、0.001mass%以上含有させるのが好ましい。しかし、0.005mass%を超えると、上記効果が飽和し、製造コストの上昇を招くだけであるため、上限は0.005mass%とする。
SnおよびSbは、集合組織を改善して磁束密度を向上するのに有効な元素であるため、それぞれ0.001mass%以上含有させることが好ましい。一方、0.1mass%を超えると、上記効果が飽和し、製造コストの上昇を招くだけであるため、上限は0.1mass%とする。
Niは、磁束密度を向上させるために効果的な元素である。上記効果を得るためには、0.1mass%以上添加するのが好ましい。一方、2mass%を超える添加は、上記効果が飽和し、原料コストの上昇を招くだけとなるため、上限は2mass%とするのが好ましい。
Moは、微細炭化物となって析出し、鋼の強度を高める元素である。上記効果を得るためには、0.001mass%以上添加するのが好ましい。一方、添加量が0.05mass%を超えると、鉄損が著しく増加するようになるため、上限は0.05mass%とするのが好ましい。
Cuは、集合組織を改善し、磁束密度を向上する元素である。この効果を得るためには0.01mass%以上添加するのが好ましい。一方、0.2mass%を超えると、上記効果が飽和し、原料コストの上昇を招くだけであるため、上限は0.2mass%とするのが好ましい。
Mgは、介在物を粗大化し、鉄損低減に寄与する元素である。上記効果を得るためには、0.001mass%以上添加するのが好ましい。一方、添加量が0.005mass%を超えると、上記効果が飽和し、原料コストの上昇を招くだけとなるため、上限は0.005mass%とするのが好ましい。
REMは、硫化物系介在物を粗大化し、鉄損低減に寄与する元素である。上記効果を得るためには、0.001mass%以上添加するのが好ましい。一方、添加量が0.005mass%を超えると、上記効果が飽和し、原料コストの上昇を招くだけとなるため、上限は0.005mass%とするのが好ましい。
TiおよびVは、微細炭窒化物を形成して析出し、鋼の強度を高める元素である。この効果を得るためには、TiまたはVを単独で、あるいは、TiおよびVを合計で0.005mass%以上添加するのが好ましい。一方、TiまたはV単独の、あるいは、TiおよびV合計の添加量が0.05mass%を超えると、鉄損が著しく増加するようになるため、単独または合計の上限は0.05mass%とするのが好ましい。
本発明の無方向性電磁鋼板の製造方法は、本発明で規定する上記成分組成の範囲内であれば、それ以外の製造条件については常法に従って行えばよい。すなわち、転炉で吹練した溶鋼を真空脱ガス処理等で二次精錬し、上記した所定の成分組成に調整した後、連続鋳造法または造塊−分塊圧延法で鋼素材(スラブ)とし、熱間圧延し、必要に応じて熱延板焼鈍し、冷間圧延して最終板厚の冷延板とし、仕上焼鈍を行なう方法で製造することができる。
また、上記製品板から、組織観察用サンプルを採取し、圧延方向断面を研磨し、ナイタールにてエッチングした後、JIS G0551に準拠して測定して平均結晶粒径を測定するとともに、鋼板表面を50μm研磨し、SEMで0.1mm2の範囲を10視野観察し、円相当径が5μm以上の介在物の1mm2当たりの個数を求めた。
また、上記製品板から、圧延方向を引張方向とするJIS5号試験片を20本採取し、JIS Z 2241に準拠して引張試験を行い、引張強さTSを測定し、20本の引張試験の平均値および標準偏差σを求めた。
さらに、上記製品板から、圧延方向を長さ方向とする平行部の幅が5mm、長さが150mmの疲労試験片を採取し、引張り−引張り、応力比0.1、周波数20Hzにて疲労試験を行い、107回の繰り返しにおいても破断が生じない応力振幅(疲労限)を測定した。なお、上記疲労試験片は、平行部を▽▽▽仕上げとし、さらに長手方向に800番のエメリー紙にて研磨した。
Claims (5)
- C:0.005mass%以下、Si:3〜5mass%、Mn:5mass%以下、P:0.1mass%以下、S:0.01mass%以下、Al:3mass%以下、N:0.005mass%以下およびZn:0.0005〜0.003mass%を含有し、残部がFeおよび不可避不純物からなる成分組成を有し、
平均結晶粒径が40μm以下、
直径5μm以上の介在物が5個/mm2以下で、
引張強さが600MPa以上かつ疲労強度が450MPa以上である無方向性電磁鋼板。 - 上記成分組成に加えてさらに、Crを0.1〜5mass%含有することを特徴とする請求項1に記載の無方向性電磁鋼板。
- 上記成分組成に加えてさらに、Caを0.001〜0.005mass%含有することを特徴とする請求項1または2に記載の無方向性電磁鋼板。
- 上記成分組成に加えてさらに、Sn:0.001〜0.1mass%およびSb:0.001〜0.1mass%のうちから選ばれる1種または2種を含有することを特徴とする請求項1〜3のいずれか1項に記載の無方向性電磁鋼板。
- 上記成分組成に加えてさらに、Ni:0.1〜2mass%、Mo:0.001〜0.05mass%、Cu:0.01〜0.2mass%、Mg:0.001〜0.005mass%、REM:0.001〜0.005mass%および(Ti+V):0.005〜0.05mass%のうちから選ばれる少なくとも1種の成分を含有することを特徴とする請求項1〜4のいずれか1項に記載の無方向性電磁鋼板。
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