WO2016068291A1 - 耐排ガス凝縮水腐食性とろう付け性に優れたフェライト系ステンレス鋼及びその製造方法 - Google Patents
耐排ガス凝縮水腐食性とろう付け性に優れたフェライト系ステンレス鋼及びその製造方法 Download PDFInfo
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Definitions
- the EGR cooler is generally assembled by brazing and a high brazing property is required for the parts to be used.
- the wettability of the surface is important in order to improve the brazing property.
- Ti is more easily oxidized than Fe and Cr, and forms an oxide film with low wettability on the surface. For this reason, it is desirable to lower the Ti content.
- Al forms an oxide film with low wettability on the surface.
- the surface roughness of the steel plate greatly affects the wettability, it is also very important to control the surface properties by controlling the manufacturing conditions.
- B 0.0002 to 0.0030%
- Ca 0.0002 to 0.0100%
- Zr 0.010 to 0.300%
- Co 0.010 to 0.300%
- Ga 0.0001 to 0.0100%
- Ta 0.0001 to 0.0100%
- REM 0.001 to 0.200%
- Si promotes the generation of Ti-based oxides by increasing the activity of Ti
- the rolling oil may be mineral oil or water-soluble oil.
- V In improving corrosion resistance, V can be contained in an amount of 0.300% or less. It is a V amount of 0.010% or more that a stable effect can be obtained. The amount of V is more preferably 0.020 to 0.050%.
- Ca is added for desulfurization, but if an excessive amount of Ca is added, water-soluble inclusions CaS are generated and the corrosion resistance is lowered. Therefore, Ca can be added in an amount of 0.0002 to 0.0100%. The amount of Ca is more desirably 0.0002 to 0.0050%.
- the annealing process of the cold-rolled sheet includes a process in which the steel sheet is retained at 650 to 950 ° C. for 5.0 s or more, and the steel sheet is 80.degree. It is desirable to have a step of staying for 0 s or less.
- a test piece having both a width and a length of 100 mm was cut out from the produced steel plate.
- the arithmetic average roughness of the steel surface in each of the rolling direction (L direction), the direction perpendicular to the rolling direction (C direction), and the direction inclined 45 ° to the rolling direction (V direction) It measured using the shape measuring machine.
- the measurement length was 4.0 mm
- the measurement speed was 0.30 mm / s
- the cutoff wavelength was 0.8 mm.
- the average value of three measurement results was defined as the arithmetic average roughness in that direction.
- the residence time of the steel sheet at 650 to 950 ° C. was set to 5.0 s or more, and the residence time of the steel sheet at 950 to 1050 ° C. was set to 80.0 s or less. It can be seen that the change in the grain size number before and after the brazing heat treatment is 5.0 or less in the steel type manufactured under these conditions.
- the ferritic stainless steel having excellent corrosion resistance against exhaust gas condensate of the present invention is suitable as a member used in exhaust gas recirculation devices such as automobile mufflers, exhaust heat recovery devices, and EGR (Exhaust Gas Recirculation) coolers.
- exhaust gas recirculation devices such as automobile mufflers, exhaust heat recovery devices, and EGR (Exhaust Gas Recirculation) coolers.
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Abstract
Description
本願は、2014年10月31日に、日本に出願された特願2014-222201号及び2015年10月27日に、日本に出願された特願2015-210741号に基づき優先権を主張し、その内容をここに援用する。
Al/Si≧0.10 … (1)
0.35≦Nb+5V≦2.0・・・式(A)
(1)質量%で、
C:0.001~0.030%、
Si:0.01~1.00%、
Mn:0.01~2.00%、
P:0.050%以下、
S:0.0100%以下、
Cr:11.0~30.0%、
Mo:0.01~3.00%、
Ti:0.001~0.050%、
Al:0.001~0.030%、
Nb:0.010~1.000%、及び
N:0.050%以下を含有し、
残部がFeおよび不可避的不純物からなり、かつ上記Al量、Ti量及びSi量(質量%)が、Al/Ti≧8.4Si-0.78を満たすことを特徴とする耐排ガス凝縮水腐食性とろう付け性に優れたフェライト系ステンレス鋼。
(2)さらに質量%で、
Ni:0.01~3.00%、
Cu:0.050~1.500%、
W:0.010~1.000%、
V:0.010~0.300%、
Sn:0.005~0.500%、
Sb:0.0050~0.5000%、及び
Mg:0.0001~0.0030%
のうち何れか1種または2種以上を含有することを特徴とする(1)に記載の耐排ガス凝縮水腐食性とろう付け性に優れたフェライト系ステンレス鋼。
(3)さらに質量%で、
B:0.0002~0.0030%、
Ca:0.0002~0.0100%、
Zr:0.010~0.300%、
Co:0.010~0.300%、
Ga:0.0001~0.0100%、
Ta:0.0001~0.0100%、及び
REM:0.001~0.200%
のうち何れか1種または2種以上を含有することを特徴とする(1)または(2)に記載の耐排ガス凝縮水腐食性とろう付け性に優れたフェライト系ステンレス鋼。
(4)圧延方向をL方向、圧延方向に対して垂直方向をC方向、圧延方向に対して45°傾いた方向をV方向とし、それぞれの方向における鋼表面の算術平均粗さをそれぞれRaL、RaC、RaV(単位:μm)とした時に、(RaL+RaC+2RaV)/4≦0.50かつ|(RaL+RaC-2RaV)/2|≦0.10を満たすことを特徴とする(1)~(3)のいずれか一項に記載の耐排ガス凝縮水腐食性とろう付け性に優れたフェライト系ステンレス鋼。
(5)50Pa以下の真空雰囲気中にて1150℃で10分間の熱処理の前後での結晶粒度番号GSNの変化量が、5.0以下であることを特徴とする(1)~(4)のいずれか一項に記載の耐排ガス凝縮水腐食性とろう付け性に優れたフェライト系ステンレス鋼。
(6)排ガス凝縮水環境に曝される自動車部品である自動車マフラー、排熱回収器、又はEGRクーラに使用される(1)~(5)のいずれか一項に記載の耐排ガス凝縮水腐食性とろう付け性に優れたフェライト系ステンレス鋼。
(7)(1)乃至(3)の何れか一項に記載の化学成分を有する鋼を冷間圧延する工程を有し、前記冷間圧延の工程では、最終パスにて、ロール粗さが#60以上のロールを用い、最終パスの圧下率を15.0%以下とし、最終パスの冷延速度を800m/min以下とする条件で圧延することを特徴とする耐排ガス凝縮水腐食性とろう付け性に優れたフェライト系ステンレス鋼の製造方法。
(8)前記冷間圧延後の鋼板を焼鈍する工程を更に有し、前記焼鈍の工程は、前記鋼板を650~950℃で5.0s以上滞留する工程と、前記鋼板を950~1050℃で80.0s以下に滞留する工程を有することを特徴とする(7)に記載の耐排ガス凝縮水腐食性とろう付け性に優れたフェライト系ステンレス鋼の製造方法。
(1)最終パスの冷延に使用するロールの粗さを#60以上にする。
(2)最終パスの圧下率を15.0%以下にする。
(3)最終パスの冷延速度を800m/min以下にする。
特に(RaL+RaC+2RaV)/4≦0.50かつ|(RaL+RaC-2RaV)/2|≦0.10を満たす場合に、ろう付け性が向上することがわかる。望ましくは(RaL+RaC+2RaV)/4≦0.30かつ|(RaL+RaC-2RaV)/2|≦0.05である。これらの指標の値は小さい程良いため、これらの指標の下限値を設ける必要は無い。しかし、(RaL+RaC+2RaV)/4の現実的に達成可能な最も低い値は0.02であり、|(RaL+RaC-2RaV)/2|の現実的に達成可能な最も低い値は0.005である。
ここで、REM(希土類元素)は、一般的な定義に従い、スカンジウム(Sc)、イットリウム(Y)の2元素と、ランタン(La)からルテチウム(Lu)までの15元素(ランタノイド)の総称を指す。REMは、これら希土類元素から選択される1種以上であり、REMの量とは、希土類元素の合計量である。
Claims (8)
- 質量%で、
C:0.001~0.030%、
Si:0.01~1.00%、
Mn:0.01~2.00%、
P:0.050%以下、
S:0.0100%以下、
Cr:11.0~30.0%、
Mo:0.01~3.00%、
Ti:0.001~0.050%、
Al:0.001~0.030%、
Nb:0.010~1.000%、及び
N:0.050%以下を含有し、
残部がFeおよび不可避的不純物からなり、かつ上記Al量、Ti量及びSi量(質量%)が、Al/Ti≧8.4Si-0.78を満たすことを特徴とする耐排ガス凝縮水腐食性とろう付け性に優れたフェライト系ステンレス鋼。 - さらに質量%で、
Ni:0.01~3.00%、
Cu:0.050~1.500%、
W:0.010~1.000%、
V:0.010~0.300%、
Sn:0.005~0.500%、
Sb:0.0050~0.5000%、及び
Mg:0.0001~0.0030%
のうち何れか1種または2種以上を含有することを特徴とする請求項1に記載の耐排ガス凝縮水腐食性とろう付け性に優れたフェライト系ステンレス鋼。 - さらに質量%で、
B:0.0002~0.0030%、
Ca:0.0002~0.0100%、
Zr:0.010~0.300%、
Co:0.010~0.300%、
Ga:0.0001~0.0100%、
Ta:0.0001~0.0100%、及び
REM:0.001~0.200%
のうち何れか1種または2種以上を含有することを特徴とする請求項1または2に記載の耐排ガス凝縮水腐食性とろう付け性に優れたフェライト系ステンレス鋼。 - 圧延方向をL方向、圧延方向に対して垂直方向をC方向、圧延方向に対して45°傾いた方向をV方向とし、それぞれの方向における鋼表面の算術平均粗さをそれぞれRaL、RaC、RaV(単位:μm)とした時に、(RaL+RaC+2RaV)/4≦0.50かつ|(RaL+RaC-2RaV)/2|≦0.10を満たすことを特徴とする請求項1~3のいずれか一項に記載の耐排ガス凝縮水腐食性とろう付け性に優れたフェライト系ステンレス鋼。
- 50Pa以下の真空雰囲気中にて1150℃で10分間の熱処理の前後での結晶粒度番号GSNの変化量が、5.0以下であることを特徴とする請求項1~4のいずれか一項に記載の耐排ガス凝縮水腐食性とろう付け性に優れたフェライト系ステンレス鋼。
- 排ガス凝縮水環境に曝される自動車部品である自動車マフラー、排熱回収器、又はEGRクーラに使用される請求項1~5のいずれか一項に記載の耐排ガス凝縮水腐食性とろう付け性に優れたフェライト系ステンレス鋼。
- 請求項1乃至請求項3の何れか一項に記載の化学成分を有する鋼を冷間圧延する工程を有し、
前記冷間圧延の工程では、最終パスにて、ロール粗さが#60以上のロールを用い、最終パスの圧下率を15.0%以下とし、最終パスの冷延速度を800m/min以下とする条件で圧延することを特徴とする耐排ガス凝縮水腐食性とろう付け性に優れたフェライト系ステンレス鋼の製造方法。 - 前記冷間圧延後の鋼板を焼鈍する工程を更に有し、
前記焼鈍の工程は、前記鋼板を650~950℃で5.0s以上滞留する工程と、前記鋼板を950~1050℃で80.0s以下滞留する工程を有することを特徴とする請求項7に記載の耐排ガス凝縮水腐食性とろう付け性に優れたフェライト系ステンレス鋼の製造方法。
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