JP6786964B2 - 硫黄添加鋼の連続鋳造ノズルの閉塞防止方法 - Google Patents
硫黄添加鋼の連続鋳造ノズルの閉塞防止方法 Download PDFInfo
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- JP6786964B2 JP6786964B2 JP2016169670A JP2016169670A JP6786964B2 JP 6786964 B2 JP6786964 B2 JP 6786964B2 JP 2016169670 A JP2016169670 A JP 2016169670A JP 2016169670 A JP2016169670 A JP 2016169670A JP 6786964 B2 JP6786964 B2 JP 6786964B2
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- sulfur
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- steel
- continuous casting
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- 229910000831 Steel Inorganic materials 0.000 title claims description 136
- 239000010959 steel Substances 0.000 title claims description 136
- 238000009749 continuous casting Methods 0.000 title claims description 51
- 229910052717 sulfur Inorganic materials 0.000 claims description 78
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound 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[S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 76
- 239000011593 sulfur Substances 0.000 claims description 76
- 229910052760 oxygen Inorganic materials 0.000 claims description 73
- 239000001301 oxygen Substances 0.000 claims description 73
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- 230000002265 prevention Effects 0.000 description 1
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[Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 1
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- 229910052683 pyrite Inorganic materials 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
- 239000000700 tracer Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Description
Sは、鋼の切削加工性の確保に必要な元素であり、また、連続鋳造時のノズル閉塞の発生に影響を及ぼす元素である。Sが0.012%未満であると、硫黄添加源の添加量は少なくてすみ、ノズル閉塞は発生しないが、所要の切削加工性を確保できないので、Sは0.012%以上とする。好ましくは0.015%以上である。
Alは、溶鋼中のOと反応してAl2O3を生成し、溶鋼を脱酸する元素である。Alが0.015%未満であると、脱酸効果が十分に発現しないので、Alは0.015%以上とする。好ましくは0.025%以上である。
Cは、鋼の強度や溶接部の焼入れ性の確保に必要な元素である。Cが0.07%未満であると、機械構造用鋼に必要な強度を確保することが難しくなるので、Cは0.07%以上が好ましい。より好ましくは0.10%以上である。一方、Cが1.20%を超えると、靭性が低下するので、Cは1.20%以下が好ましい。より好ましくは1.00%以下である。
Siは、固溶強化で、鋼の強度の向上に寄与する元素である。Siが1.00%を超えると、靱性が低下するので、Siは1.00%以下が好ましい。より好ましくは0.70%以下である。下限は特に限定しないが、Siの添加効果を十分に得るには、0.01%以上が好ましい。より好ましくは0.10%以上である。
Mnは、鋼の焼入れ性を高め、強度の向上に寄与する元素である。Mnが2.50%を超えると、鋼の溶接性が低下するので、Mnは2.50%以下が好ましい。より好ましくは2.00%以下である。下限は特に限定しないが、Mnの添加効果を十分に得るには、0.30%以上が好ましい。より好ましくは0.50%以上である。
Pは、偏析して、靭性を阻害する元素である。Pが0.10%を超えると、靭性が著しく低下するので、Pは0.10%以下が好ましい。より好ましくは0.05%以下である。下限は特に限定しないが、Pを0.001%未満に低減すると、製造コストが大幅に上昇するので、実用鋼上、0.001%が実質的な下限である。製造コストの点で、0.010%以上がより好ましい。
Nは、固溶強化で、鋼の強度の向上に寄与する元素である。Nが0.02%を超えると、固溶N量が増大して、強度が上昇し、靱性が低下するので、Nは0.02%以下が好ましい。より好ましくは0.015%以下である。下限は特に限定しないが、Nを0.001%未満に低減すると、製造コストが大幅に上昇するので、実用鋼上、0.001%が実質的な下限である。製造コストの点で、0.002%以上がより好ましい。
Cu:2.00%以下
Ni:2.00%以下
CuとNiは、いずれも、鋼の強度の向上に寄与する元素である。
Cr:2.00%以下
Mo:2.00%以下
CrとMoは、いずれも、鋼の強度の向上に寄与する元素である。
Nb:0.25%以下
V :0.25%以下
NbとVは、いずれも、炭窒化物を形成し、炭窒化物のピン止め効果により、強度や靭性の向上に寄与する元素である。
Ti:0.30%以下
B :0.005%以下
Tiは、Nと結合して窒化物を形成して結晶粒を微細化し、靭性の向上に寄与する元素である。Tiが0.30%を超えると、切削加工性が低下するので、Tiは0.30%以下が好ましい。より好ましくは0.25%以下である。下限は特に限定しないが、Tiの添加効果を十分に得るには、0.01%以上が好ましい。より好ましくは0.02%以上である。
容量300トンの転炉で一次精錬した溶鋼を取鍋に出鋼する際、金属Alを添加してAl脱酸を実施した。
Claims (8)
- 硫黄添加源を添加し、S量を調整した、質量%で、C:0.07〜1.20%、Si:1.00%以下、Mn:2.50%以下、P:0.10%以下、S:0.012〜0.100%、Al:0.015〜0.100%、N:0.02%以下を含有し、残部が鉄及び不可避不純物からなる硫黄添加鋼の連続鋳造において、前記硫黄添加源として、酸素濃度:3質量%超、20質量%以下の高酸素濃度硫黄添加源と、酸素濃度:3質量%以下の低酸素濃度硫黄添加源を併用して、前記硫黄添加源からの酸素侵入総量を40ppm以下に抑制することを特徴とする硫黄添加鋼の連続鋳造ノズルの閉塞防止方法。
- 前記高酸素濃度硫黄添加源が硫化鉱石であることを特徴とする請求項1に記載の硫黄添加鋼の連続鋳造ノズルの閉塞防止方法。
- 前記硫黄添加鋼のS量を調整する際、溶鋼に、高酸素濃度硫黄添加源を先に添加し、その後、低酸素濃度硫黄添加源を添加することを特徴とする請求項1又は2に記載の硫黄添加鋼の連続鋳造ノズルの閉塞防止方法。
- 前記硫黄添加鋼が、さらに、質量%で、Cu:2.00%以下、及び、Ni:2.00%以下の1種又は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項に記載の硫黄添加鋼の連続鋳造ノズルの閉塞防止方法。
- 前記硫黄添加鋼が、さらに、質量%で、Cr:2.00%以下、及び、Mo:2.00%以下の1種又は2種を含有することを特徴とする請求項1〜4のいずれか1項に記載の硫黄添加鋼の連続鋳造ノズルの閉塞防止方法。
- 前記硫黄添加鋼が、さらに、質量%で、Nb:0.25%以下、及び、V:0.25%以下の1種又は2種を含有することを特徴とする請求項1〜5のいずれか1項に記載の硫黄添加鋼の連続鋳造ノズルの閉塞防止方法。
- 前記硫黄添加鋼が、さらに、質量%で、Ti:0.30%以下、及び、B:0.005%以下の1種又は2種を含有することを特徴とする請求項1〜6のいずれか1項に記載の硫黄添加鋼の連続鋳造ノズルの閉塞防止方法。
- 前記硫黄添加鋼のS量を調整する際、硫黄添加源を、RH脱ガス処理工程にて、硫黄以外の成分の組成調整が終了した後、又は、二次精錬処理が終了した後の溶鋼に添加することを特徴とする請求項1〜7のいずれか1項に記載の硫黄添加鋼の連続鋳造ノズルの閉塞防止方法。
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