JP4953371B2 - 耐硝酸腐食性に優れたNi基合金及びその製造方法 - Google Patents
耐硝酸腐食性に優れたNi基合金及びその製造方法 Download PDFInfo
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- JP4953371B2 JP4953371B2 JP2007117968A JP2007117968A JP4953371B2 JP 4953371 B2 JP4953371 B2 JP 4953371B2 JP 2007117968 A JP2007117968 A JP 2007117968A JP 2007117968 A JP2007117968 A JP 2007117968A JP 4953371 B2 JP4953371 B2 JP 4953371B2
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
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- 229910001430 chromium ion Inorganic materials 0.000 description 1
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- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 1
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Description
本実施の形態におけるNi基合金は、具体的には、C:0.03wt%以下、Si:2.0〜3.0wt%、Mn:0.5wt%以下、Fe:0.5wt%以下、P:0.01wt%以下、S:0.01wt%以下、Cr:25.0〜33.0wt%、W:7.0〜11.0wt%を含有し、Niおよび不可避的不純物を残部として成る。
ここで、Ni基合金の鋼塊の溶製工程において、電子ビーム溶解法を採用している。電子ビーム溶解法は、基本的にドリップ溶解法とコールドハース溶解法に大別される。ドリップ溶解法は、原料電極(電子ビーム溶解の原料は電子銃の対極となるため、こう表現する)の先端に電子ビームを照射し、生成した液滴を直接、水冷胴鋳型に落下させて積層凝固させる方法である。また、コールドハース溶解法は、原料先端で生成した液滴を一旦コールドハースと呼ばれる水冷の浅い銅製容器に溜め、ここからオーバーフローさせた溶湯を水冷胴鋳型に注いでスターティングブロックと称する土台の上に積層凝固させる方法である。本実施の形態においては、どちらの溶解法を用いてもよい。
図1は、本実施の形態におけるNi基合金、及び、比較材としてのオーステナイト系ステンレス鋼(SUS310ULC、市販鋼)の伝熱面沸騰腐食試験結果を示したものである。腐食試験は、0.2g/LのCr6+を添加した8規定沸騰硝酸溶液を用い、系の圧力を調整して溶液温度を60℃に制御し、1バッチ48時間毎に試験液を更新しながら20バッチ継続した。なお、Cr6+の供給速度は1g/m2・hである。
次に、本実施の形態に係るNi基合金の製造方法について、以下の実施例を参照しながら説明する。
以上のように、本実施の形態の耐硝酸腐食性に優れたNi基合金は、Cを0.03wt%以下、Siを2.0〜3.0wt%、Mnを0.5wt%以下、Feを0.5wt%以下、Pを0.01wt%以下、Sを0.01wt%以下、Crを25.0〜33.0wt%、Wを7.0〜11.0wt%の比率でそれぞれ含有し、Ni及び不可避的不純物を残部として成る構成にされている。
Claims (2)
- Cを0.03wt%以下、Siを2.0〜3.0wt%、Mnを0.5wt%以下、Feを0.5wt%以下、Pを0.01wt%以下、Sを0.01wt%以下、Crを25.0〜33.0wt%、Wを7.0〜11.0wt%の比率でそれぞれ含有し、Ni及び不可避的不純物を残部として成ることを特徴とする耐硝酸腐食性に優れたNi基合金。
- Cを0.03wt%以下、Siを2.0〜3.0wt%、Mnを0.5wt%以下、Feを0.5wt%以下、Pを0.01wt%以下、Sを0.01wt%以下、Crを25.0〜33.0wt%、Wを7.0〜11.0wt%の比率でそれぞれ含有し、Ni及び不可避的不純物を残部として成るNi基合金の鋼塊の溶製工程で、電子ビーム溶解法による溶解を前記鋼塊に施すことを特徴とする耐硝酸腐食性に優れたNi基合金の製造方法。
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JPH0615706B2 (ja) * | 1985-03-14 | 1994-03-02 | 三井造船株式会社 | 高耐食アモルフアス合金 |
JPH06287716A (ja) * | 1993-03-31 | 1994-10-11 | Hitachi Metals Ltd | 耐酸化、耐食性の優れた耐熱合金 |
JP4353617B2 (ja) * | 2000-05-26 | 2009-10-28 | 株式会社クボタ | プラスチック混練機・成形機部材用耐食耐摩耗Ni合金および部材 |
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