JP6022421B2 - 原油タンク用鋼材の腐食速度推計方法 - Google Patents
原油タンク用鋼材の腐食速度推計方法 Download PDFInfo
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- JP6022421B2 JP6022421B2 JP2013152720A JP2013152720A JP6022421B2 JP 6022421 B2 JP6022421 B2 JP 6022421B2 JP 2013152720 A JP2013152720 A JP 2013152720A JP 2013152720 A JP2013152720 A JP 2013152720A JP 6022421 B2 JP6022421 B2 JP 6022421B2
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但し、<%S>および<%Cl>は夫々錆中のS含有量(質量%)およびCl含有量(質量%)を表し、[%Cu]、[%Ni]および[%Cr]は夫々鋼中のCu含有量(質量%)、Ni含有量(質量%)およびCr含有量(質量%)を表す。
X=<%S>+5<%Cl>・・・(2)
Y=[%Cu]+[%Ni]+[%Cr]・・・(3)
Z=0.696exp{0.0751(X−10Y)}・・・(4)
Claims (2)
- 質量%で、C:0.01〜0.30%、Si:0.01〜1.0%、Mn:0.01〜2.0%、P:0.05%以下(0%を含まない)、S:0.03%以下(0%を含まない)、Al:0.005〜0.10%、Cu:1.0%以下(0%を含む)、Ni:1.0%以下(0%を含む)、Cr:1.0%以下(0%を含む)を含有し、残部が鉄および不可避的不純物からなる原油タンク用鋼材の腐食速度推計方法であって、
前記各元素の含有量が前記した範囲内にあり、且つCu,Ni,Crのうち少なくとも一つの元素の含有量が異なる複数種の調査用鋼材を用いて、
原油タンク内の定常時の温度:20〜40℃、原油中に含まれるS含有量:0.01〜5質量%の腐食環境下における、各調査用鋼材毎の最大孔食深さと、前記腐食環境下に曝された期間を調べると共に、前記各調査用鋼材に生成した錆中のS含有量およびCl含有量を調べ、
前記各調査用鋼材毎の実際の腐食速度を、(最大孔食深さ)/(腐食環境下に曝された期間)から求めた後、
前記各調査用鋼材毎の実際の腐食速度と、前記各調査用鋼材に生成した錆中のS含有量およびCl含有量、並びに前記各調査用鋼材中のCu,Ni,およびCrの含有量との関係をもとに、推計腐食速度Zを求める下記式(1)における係数a,b,c,d,e,fの値を決めておき、
下記式(1)に、腐食速度を推計しようとする原油タンク用鋼材中のCu,Ni,Crの含有量、および前記原油タンク用鋼材に生成した錆中のS含有量およびCl含有量を代入することにより、原油タンク用鋼材の推計腐食速度Zを求めることを特徴とする原油タンク用鋼材の腐食速度推計方法。
Z=a×exp(b×<%S>+c×<%Cl>+d×[%Cu]+e×[%Ni]+f×[%Cr])・・・(1)
但し、<%S>および<%Cl>は夫々錆中のS含有量(質量%)およびCl含有量(質量%)を表し、[%Cu]、[%Ni]および[%Cr]は夫々鋼中のCu含有量(質量%)、Ni含有量(質量%)およびCr含有量(質量%)を表す。 - 前記複数種の各調査用鋼材と、前記腐食速度を推計しようとする前記原油タンク用鋼材中の各元素の含有量の差が、Cで±0.05%以内、Siで±0.10%以内、Mnで±0.10%以内、Pで±0.005%以内、Sで±0.005%以内、Alで±0.010%以内である請求項1記載の原油タンク用鋼材の腐食速度推計方法。
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JP6635135B2 (ja) * | 2017-03-24 | 2020-01-22 | Jfeスチール株式会社 | 腐食センサの設計方法および腐食センサの製造方法 |
CN108680519A (zh) * | 2018-04-11 | 2018-10-19 | 陕西省石油化工研究设计院 | 一种石油产品中铜片平均腐蚀速率的定量测定方法 |
CN114660159B (zh) * | 2022-03-21 | 2024-04-05 | 中国石油化工股份有限公司 | 一种减缓醋酸乙烯装置精馏系统腐蚀的方法 |
CN114777698B (zh) * | 2022-06-21 | 2022-08-30 | 南通市通州区袁灶燃气有限公司 | 一种储油罐腐蚀检测方法及系统 |
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JP5771011B2 (ja) * | 2011-01-18 | 2015-08-26 | 株式会社神戸製鋼所 | 耐食性に優れた構造部材用鋼材 |
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