JP6082625B2 - Stainless steel strip manufacturing method - Google Patents
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- 239000010935 stainless steel Substances 0.000 title claims description 24
- 229910001220 stainless steel Inorganic materials 0.000 title claims description 24
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 238000005554 pickling Methods 0.000 claims description 33
- 229910000831 Steel Inorganic materials 0.000 claims description 32
- 239000010959 steel Substances 0.000 claims description 32
- 238000005422 blasting Methods 0.000 claims description 19
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 13
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 7
- 238000000137 annealing Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 239000000243 solution Substances 0.000 description 8
- 239000007864 aqueous solution Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005098 hot rolling Methods 0.000 description 3
- 239000002436 steel type Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000003631 expected effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Description
本発明は、熱延およびその後のベル焼鈍あるいは連続焼鈍によってステンレス鋼の表面に生成した酸化スケールを除去する技術に関する。 The present invention relates to a technique for removing oxide scale formed on the surface of stainless steel by hot rolling and subsequent bell annealing or continuous annealing.
ステンレス鋼の熱延焼鈍鋼帯の脱スケールは、一般的にスケールブレーカー（繰り返し曲げ）、ショットブラスト、酸洗槽で構成される脱スケール設備が用いられている。酸洗液としては弗硝酸が用いられることが多いが、塩酸を用いる場合もある。また、硫酸槽等の前処理を併用する場合もある。 For descaling of a stainless steel hot-rolled annealed steel strip, descaling equipment generally composed of a scale breaker (repetitive bending), shot blasting, and a pickling tank is used. As the pickling solution, hydrofluoric acid is often used, but hydrochloric acid is sometimes used. In some cases, a pretreatment such as a sulfuric acid tank is used in combination.
脱スケール能力を向上させるためには、酸洗液の濃度、温度を高めることは有効である。しかし、濃度、温度ともに現状ですでに高く、設備や作業環境の負荷を考えると更なる改善は難しい。 In order to improve the descaling ability, it is effective to increase the concentration and temperature of the pickling solution. However, both the concentration and temperature are already high at present, and further improvement is difficult considering the load on the equipment and work environment.
そのため、酸洗以外の方法を強化することによる脱スケール能力の向上方法も検討されている。特許文献１には、ブラシロールを配置し、表面研削による脱スケールを併用する方法が開示されている。ブラシロールは脱スケールにおいて有効であるが、ブラシの損耗量が大きく、製造コストを上昇させる要因となる。研削目が圧延によって倒れ、素地に押し込まれることで、表面欠陥を生じる場合もある。 Therefore, methods for improving the descaling ability by strengthening methods other than pickling are also being studied. Patent Document 1 discloses a method in which a brush roll is disposed and descaling by surface grinding is used in combination. The brush roll is effective in descaling, but the amount of wear of the brush is large, which increases the manufacturing cost. A ground defect may be caused by rolling and may be pushed into the substrate to cause surface defects.
特許文献２、３には、特にショットブラスト設備を積極的に活用して脱スケール能力を向上させる技術が開示されている。特許文献２は、ショットブラストの投射エネルギーを大きくして脱スケール能力を高めるとともに、酸洗液への酸洗促進剤添加によって投射エネルギーの増加に伴う表面品質の低下を抑制する技術である。特許文献３は、ショットブラストの投射条件を詳細に規定することで、酸洗処理することなく、ショットブラストと表面研削のみで脱スケールを行う技術である。 Patent Documents 2 and 3 disclose techniques for improving descaling ability by actively utilizing shot blasting equipment in particular. Patent Document 2 is a technique for increasing the projection energy of shot blast to increase the descaling ability and suppressing the deterioration of the surface quality accompanying the increase in the projection energy by adding a pickling accelerator to the pickling solution. Patent Document 3 is a technique for performing descaling only by shot blasting and surface grinding without performing pickling treatment by specifying in detail the shot blasting projection conditions.
コストを考慮すると、酸洗促進剤や過度な表面研削を用いることなく、スケールブレーカー、ショットブラスト、酸洗のみによって脱スケールを行うことが好ましい。そこで発明者らは、特許文献３の技術を利用し、スケールブレーカー、ショットブラスト、酸洗処理による脱スケール技術を検討した。しかし、特許文献３は表面研削を前提としていることから、ショットブラストと酸洗処理の併用による脱スケールに対しては、期待した効果は得られなかった。 Considering the cost, it is preferable to perform descaling only by a scale breaker, shot blasting, and pickling without using a pickling accelerator or excessive surface grinding. Therefore, the inventors examined a descaling technique using a scale breaker, shot blasting, and pickling treatment using the technique of Patent Document 3. However, since Patent Document 3 is premised on surface grinding, the expected effect cannot be obtained for descaling by the combined use of shot blasting and pickling.
本発明は、スケールブレーカー、ショットブラスト、酸洗処理によって、ステンレス焼鈍鋼帯の脱スケール技術を提供することを課題とする。 This invention makes it a subject to provide the descaling technique of a stainless steel annealed steel strip by a scale breaker, shot blasting, and a pickling process.
本発明では、上記目的を達成するために、ステンレス熱延焼鈍鋼帯の表面にショットブラスト処理を施すにあたり、投射材の平均粒径が０．２５〜０．３０ｍｍ、投射速度４０〜１００ｍ／ｓ、投射エネルギーが焼鈍方法および鋼材のＣｒ含有量に応じた下記式の範囲であり、続いて酸洗を施す。
ベル焼鈍ステンレス鋼帯：５／３Ｃｒ２＋２００／３Ｃｒ＋７６０（ｋＪ／ｍ２）以上
連続焼鈍ステンレス鋼帯：５０（ｋＪ／ｍ２）以上
投射エネルギーは、０．５×投射密度×投射速度２である。
ここで式中のＣｒは、鋼材のＣｒ含有量（質量％）である。
In the present invention, in order to achieve the above object, when the shot blast treatment is performed on the surface of the stainless hot-rolled annealed steel strip, the average particle diameter of the projection material is 0.25 to 0.30 mm, and the projection speed is 40 to 100 m / s. The projection energy is in the range of the following formula according to the annealing method and the Cr content of the steel material, followed by pickling.
Bell annealed stainless steel strip: 5 / 3Cr 2 + 200 / 3Cr + 760 (kJ / m 2 ) or more Continuous annealed stainless steel strip: 50 (kJ / m 2 ) or more Projection energy is 0.5 × projection density × projection speed 2 .
Here, Cr in the formula is the Cr content (% by mass) of the steel material.
ベル焼鈍ステンレス鋼帯とは、Ｃｒ：１１．０〜１９．０質量％を含む鋼であって、熱延後に、７００〜９００℃で３〜３０時間の熱処理を施したステンレス鋼帯のことをいう。 The bell-annealed stainless steel strip is a steel containing Cr: 11.0 to 19.0 mass%, and is a stainless steel strip that has been subjected to heat treatment at 700 to 900 ° C. for 3 to 30 hours after hot rolling. Say.
連続焼鈍ステンレス鋼帯とは、Ｃｒ：１１．０〜３ ５．０質量％を含む鋼であって、熱延後に、７００℃以上の温度で、１時間以下の熱処理を施したステンレス鋼帯のことをいう。 Continuously annealed stainless steel strip is a steel containing Cr: 11.0 to 35.0 mass%, and is a stainless steel strip that has been subjected to heat treatment at 700 ° C. or higher for 1 hour or less after hot rolling. That means.
酸洗処理はＨＦ濃度１〜５０ｇ／ｌ、ＨＮＯ３濃度２０〜１５０ｇ／ｌ、メタル分６０ｇ／ｌ以下、液温３０〜６０℃の弗硝酸水溶液に浸漬する方法とする。 The pickling treatment is performed by dipping in an aqueous hydrofluoric acid solution having an HF concentration of 1 to 50 g / l, an HNO 3 concentration of 20 to 150 g / l, a metal content of 60 g / l or less, and a liquid temperature of 30 to 60 ° C.
さらに、Ｎａ２ＳＯ４水溶液中での電解、Ｈ２ＳＯ４水溶液での浸漬、ＦｅＣｌ３水溶液での浸漬など、既に知られている酸洗方法と組み合わせてもよい。 Further, it may be combined with a known pickling method such as electrolysis in an aqueous solution of Na 2 SO 4 , immersion in an aqueous solution of H 2 SO 4 , immersion in an aqueous solution of FeCl 3 .
本発明によれば、本発明によれば、酸洗促進剤やブラシロール等による過度な表面研削を用いることなく、スケールブレーカー、ショットブラスト、酸洗によってステンレス鋼熱延焼鈍鋼帯の脱スケールを行うことができる。 According to the present invention, according to the present invention, the stainless steel hot-rolled annealed steel strip can be descaled by scale breaker, shot blasting, and pickling without using excessive surface grinding with a pickling accelerator or brush roll. It can be carried out.
表１に示す組成のＳＵＳ４１０、ＳＵＳ４３０、ＳＵＳ４３０ＬＸ、ＳＵＳ３０４の実ライン熱延・焼鈍材について、酸化スケールの調査およびショットブラスト、酸洗による脱スケール性の調査を行った。 For the actual line hot-rolled / annealed material of SUS410, SUS430, SUS430LX, and SUS304 having the composition shown in Table 1, investigation of the oxide scale and investigation of descalability by shot blasting and pickling were performed.
図１に、ＳＵＳ４１０熱延・ベル焼鈍鋼帯、ＳＵＳ４３０熱延・ベル焼鈍鋼帯、ＳＵＳ４３０ＬＸ熱延・連続焼鈍鋼帯、ＳＵＳ３０４熱延・連続焼鈍鋼帯の酸化スケールおよびその直下の素地について調査した結果を示す。
ＳＵＳ４１０は、酸化スケールが厚く、酸化スケール直下の素地においてＣｒ濃度の低下は認められなかった。ＳＵＳ４３０は、ＳＵＳ４１０に比べて酸化スケールが薄いものの、ＳＵＳ４１０と同様に酸化スケール直下の素地においてＣｒ濃度の低下は認められなかった。一方、ＳＵＳ４３０ＬＸ、ＳＵＳ３０４はＳＵＳ４３０に比べても酸化スケールが薄く、さらに酸化スケール直下にＣｒ濃度が低下している領域が認められた。
In FIG. 1, the SUS410 hot-rolled / bell-annealed steel strip, SUS430 hot-rolled / bell-annealed steel strip, SUS430LX hot-rolled / continuous-annealed steel strip, SUS304 hot-rolled / continuous-annealed steel strip and the underlying substrate were investigated. Results are shown.
SUS410 has a thick oxide scale, and no decrease in Cr concentration was observed in the substrate immediately below the oxide scale. Although SUS430 has a thinner oxide scale than SUS410, a decrease in Cr concentration was not observed in the substrate directly under the oxide scale, as in SUS410. On the other hand, SUS430LX and SUS304 had a thinner oxide scale than SUS430, and a region in which the Cr concentration decreased immediately below the oxide scale was observed.
酸化スケールが薄いほど、ショットブラストによる酸化スケールの剥離やクラックの形成が起こりやすいと考えられる。また、酸化スケール直下のＣｒ濃度が低い場合、酸化スケールの剥離やクラックの形成が不十分であっても、その後の酸洗処理によってＣｒ濃度が低い領域が溶解し、脱スケールできる可能性が高いと考えられる。そこで、それぞれの鋼種の脱スケール性に及ぼすショットブラスト条件および酸洗条件について詳細に検討した。 It is considered that the thinner the oxide scale, the easier the oxide scale peeling or crack formation occurs by shot blasting. In addition, when the Cr concentration directly under the oxide scale is low, even if the oxide scale is peeled off or cracks are not sufficiently formed, the region where the Cr concentration is low is dissolved by the subsequent pickling treatment, and the possibility of descaling is high. it is conceivable that. Therefore, the shot blasting conditions and pickling conditions affecting the descalability of each steel type were examined in detail.
各ステンレス焼鈍鋼帯について、実ラインのスケールブレーカーにて曲げ曲げ戻し加工を施した後、１００ｍｍ×１００ｍｍの寸法に切断し、ラボ機にて、ショットブラスト処理を行った。投射材は平均粒径0.４５ｍｍの鉄球を用い、投射速度を４０〜１００ｍ／ｓ、投射密度を１５〜９０ｋｇ／ｍ２の範囲で変化させた。ショットブラスト後のメテンレス鋼板を、ＨＦ濃度１５ｇ／ｌ、ＨＮＯ３濃度９０ｇ／ｌ、メタル分２６ｇ／ｌ、液温５０℃の弗硝酸水溶液に、４０ｓ浸漬した。 Each stainless steel annealed steel strip was subjected to bending and bending back processing with a scale breaker on a real line, then cut into a size of 100 mm × 100 mm, and subjected to shot blasting with a laboratory machine. The projectile was an iron ball having an average particle size of 0.45 mm, and the projection speed was changed in the range of 40 to 100 m / s and the projection density in the range of 15 to 90 kg / m 2 . The steel plate after shot blasting was immersed for 40 s in an aqueous hydrofluoric acid solution having an HF concentration of 15 g / l, an HNO 3 concentration of 90 g / l, a metal content of 26 g / l, and a liquid temperature of 50 ° C.
図２に弗硝酸水溶液に浸漬した後のＳＵＳ４１０の表面外観の例を示す。図２中に示すように、酸化スケールがほとんど全面に残存している状態を０、酸化スケールが完全に除去された状態を３とし、脱スケール程度の判定を行った。 FIG. 2 shows an example of the surface appearance of SUS410 after being immersed in a hydrofluoric acid aqueous solution. As shown in FIG. 2, the state where the oxide scale remained almost entirely was set to 0, and the state where the oxide scale was completely removed was set to 3, and the degree of descaling was determined.
図３に各ステンレス鋼の脱スケール判定値とショットブラストの投射エネルギーの関係を示す。投射エネルギーとは、単位面積あたりに投射された投射材の運動エネルギーの総和のことであり、０．５×投射密度×投射速度２として求めた。図３から分かるように、ＳＵＳ４１０は、投射エネルギーが２００ｋＪ／ｍ２以上の場合に完全に脱スケールすることができた。ＳＵＳ４３０は、投射エネルギーが１２０ｋＪ／ｍ２以上の場合に完全に脱スケールすることができた。 ＳＵＳ４３０ＬＸおよびＳＵＳ３０４は、投射エネルギーが５０ｋＪ／ｍ２以上で完全に脱スケールすることができた。 FIG. 3 shows the relationship between the descaling judgment value of each stainless steel and the shot blast projection energy. The projection energy is the total kinetic energy of the projection material projected per unit area, and was calculated as 0.5 × projection density × projection speed 2 . As can be seen from FIG. 3, SUS410 was able to be completely descaled when the projection energy was 200 kJ / m 2 or more. SUS430 could be completely descaled when the projection energy was 120 kJ / m 2 or more. SUS430LX and SUS304 could be completely descaled at a projection energy of 50 kJ / m 2 or more.
鋼種によって必要な投射エネルギーが異なる理由は、既に述べたように、酸化スケールの厚みおよび酸化スケール直下のＣｒ欠乏の状況が異なるためである。そこで、Ｃｒが異なる種々のステンレス鋼帯を用いて、Ｃｒ量と、脱スケールに必要な投射エネルギーの関係について調査した。図４にその評価結果を示す。 The reason why the required projection energy differs depending on the steel type is that, as already described, the thickness of the oxide scale and the situation of Cr deficiency directly under the oxide scale are different. Then, the relationship between the amount of Cr and the projection energy required for descaling was investigated using various stainless steel strips with different Cr. FIG. 4 shows the evaluation results.
ベル焼鈍ステンレス鋼帯ではＣｒ量が多いほど、酸化スケールが薄くなり、必要な投射量ネルギーは小さくなった。図４より、必要な投射エネルギーは、５／３Ｃｒ２＋２００／３Ｃｒ＋７６０（ｋＪ／ｍ２）と求められた。 In the bell-annealed stainless steel strip, the larger the Cr content, the thinner the oxide scale and the smaller the required projection energy. From FIG. 4, the required projection energy was determined to be 5 / 3Cr 2 + 200 / 3Cr + 760 (kJ / m 2 ).
連続焼鈍ステンレス鋼帯では、必要な投射エネルギーはＣｒ量によらず５０ｋＪ／ｍ２であった。酸化スケール直下にＣｒ欠乏域が存在するためであると考えられる。 In the continuously annealed stainless steel strip, the required projection energy was 50 kJ / m 2 regardless of the Cr content. This is presumably because a Cr-deficient region exists directly under the oxide scale.
本発明で規定するショットブラスト処理を行い、その後に酸洗処理を施すことで、酸洗促進剤やブラシロール等による過度な表面研削を用いることなく、ステンレス鋼熱延焼鈍鋼帯の脱スケールを行うことができる。
以下、本発明を特定するための事項について説明する。
By performing the shot blast treatment specified in the present invention, and then performing the pickling treatment, the descaling of the stainless steel hot-rolled annealed steel strip can be performed without using excessive surface grinding with a pickling accelerator or a brush roll. It can be carried out.
Hereinafter, matters for specifying the present invention will be described.
投射材の平均粒径が０．２５ｍｍ未満の場合、空気との摩擦などによって速度が低下し、十分な効果が得られない。一方、平均粒径が０.８０ｍｍを超えると、投射材１個あたりの鋼帯との接触面積が少なくなり、投射密度のわりに投射材が当たっていない面積が多くなるため、期待した効果が得られなくなる。したがって、投射材の平均粒径は０.２５〜０．８０ｍｍとする。 When the average particle diameter of the projection material is less than 0.25 mm, the speed is lowered due to friction with air or the like, and a sufficient effect cannot be obtained. On the other hand, if the average particle size exceeds 0.80 mm, the contact area with the steel strip per projection material decreases, and the area where the projection material is not applied increases instead of the projection density, so the expected effect is obtained. It becomes impossible. Therefore, the average particle diameter of the projection material is set to 0.25 to 0.80 mm.
投射速度が遅い場合、必要な投射エネルギーを得るために投射量を増やす必要がある。一方、投射速度が速すぎると、設備への負荷が大きくなる。したがって、本発明では投射速度を４０〜１００ｍ／ｓとする。 When the projection speed is slow, it is necessary to increase the projection amount in order to obtain the necessary projection energy. On the other hand, if the projection speed is too high, the load on the equipment increases. Therefore, in this invention, a projection speed shall be 40-100 m / s.
酸洗処理において、ＨＦが２ｇ／ｌ未満、ＨＮＯ３濃度が２０ｇ／ｌ未満になると酸洗能力が低下し、生産性の低下を招く。一方、ＨＦ濃度、ＨＮＯ３濃度が高くなると、設備や作業環境への負荷が大きくなる。したがって、本発明では、ＨＦ濃度は２〜５０ｇ／ｌ、ＨＮＯ３濃度は２０〜１５０ｇ／ｌとする。 In the pickling treatment, if the HF is less than 2 g / l and the HNO 3 concentration is less than 20 g / l, the pickling ability is lowered, and the productivity is lowered. On the other hand, when the HF concentration and the HNO 3 concentration are increased, the load on the facility and the work environment is increased. Accordingly, in the present invention, the HF concentration is 2 to 50 g / l and the HNO 3 concentration is 20 to 150 g / l.
ステンレス焼鈍鋼帯の脱スケールに伴い、酸洗液中にメタル分が溶出する。メタル濃度が高くなると、脱スケール性が低下するため、メタル濃度を低く維持することが好ましい。ただし、メタル濃度を低くするためには、液の更新あるいはイオン交換処理が必要であり、コストの上昇を招くことから、本発明ではメタル分が６０ｇ／ｌまでは許容する。 As the stainless annealed steel strip is descaled, the metal is eluted in the pickling solution. As the metal concentration increases, descalability decreases, so it is preferable to keep the metal concentration low. However, in order to reduce the metal concentration, renewal of the liquid or ion exchange treatment is required, which causes an increase in cost. Therefore, in the present invention, a metal content of 60 g / l is allowed.
酸洗液の液温が低いと酸洗能力が低くなり、温度が高いと設備や作業環境への負荷が大きくなるため、本発明では液温を３０〜６０℃とする。 When the temperature of the pickling solution is low, the pickling ability is lowered, and when the temperature is high, the load on the facility and the working environment is increased.
表１に示した組成の板厚４．５ｍｍのＳＵＳ４１０熱延・ベル焼鈍鋼帯、ＳＵＳ４３０熱延・ベル焼鈍鋼帯、ＳＵＳ４３０ＬＸ熱延・連続焼鈍鋼帯、ＳＵＳ３０４熱延・連続焼鈍鋼帯にスケールブレーカーにて曲げ曲げ戻し加工を施した後、ショットブラスト処理を行った。ショットブラスト処理は、平均粒径０．５ｍｍの投射材を用い、投射速度７５ｍ／ｓで投射した。 Scaled to SUS410 hot-rolled / bell-annealed steel strip, SUS430 hot-rolled / bell-annealed steel strip, SUS430LX hot-rolled / continuously-annealed steel strip, SUS304 hot-rolled / continuously-annealed steel strip having a thickness of 4.5 mm with the composition shown in Table 1. After being bent and bent back by a breaker, shot blasting was performed. In the shot blast treatment, a projection material having an average particle diameter of 0.5 mm was used and the projection was performed at a projection speed of 75 m / s.
発明例では、投射量を、ＳＵＳ４１０熱延・ベル焼鈍鋼帯に対しては８０ｋｇ／ｍ２、ＳＵＳ４３０熱延・ベル焼鈍鋼帯に対しては５０ｋｇ／ｍ２、ＳＵＳ４３０ＬＸ熱延・連続焼鈍鋼帯、ＳＵＳ３０４熱延・連続焼鈍鋼帯に対しては、３０ｋｇ／ｍ２とした。 In the example of the invention, the projecting amount is 80 kg / m 2 for the SUS410 hot rolled / bell annealed steel strip, 50 kg / m 2 for the SUS430 hot rolled / bell annealed steel strip, SUS430LX hot rolled / continuously annealed steel strip. SUS304 hot-rolled / continuously annealed steel strip was set at 30 kg / m 2 .
比較例では、投射量を、ＳＵＳ４１０熱延・ベル焼鈍鋼帯に対しては６０ｋｇ／ｍ２、ＳＵＳ４３０熱延・ベル焼鈍鋼帯に対しては３０ｋｇ／ｍ２、ＳＵＳ４３０ＬＸ熱延・連続焼鈍鋼帯、ＳＵＳ３０４熱延・連続焼鈍鋼帯に対しては、１０ｋｇ／ｍ２とした。 In the comparative example, the projection amount is 60 kg / m 2 for the SUS410 hot rolled / bell annealed steel strip, 30 kg / m 2 for the SUS430 hot rolled / bell annealed steel strip, SUS430LX hot rolled / continuously annealed steel strip. SUS304 hot-rolled / continuously annealed steel strip was set to 10 kg / m 2 .
ショットブラスト後の坏テンレス鋼帯を、ＨＦ濃度１５ｇ／ｌ、ＨＮＯ３濃度９０ｇ／ｌ、メタル分２６ｇ／ｌ、液温５０℃の弗硝酸水溶液に、４０ｓ浸漬し、酸洗処理を行った。 The shot stainless steel strip after shot blasting was dipped in an aqueous hydrofluoric acid solution having an HF concentration of 15 g / l, an HNO 3 concentration of 90 g / l, a metal content of 26 g / l, and a liquid temperature of 50 ° C. for 40 s to perform pickling.
図５に脱スケール後の表面外観を示す。発明例ではスケール残は認められなかった。一方、比較例では、いずれの鋼種にもスケール残が認められ、脱スケールは不十分であった。 FIG. 5 shows the appearance of the surface after descaling. No scale residue was observed in the inventive examples. On the other hand, in the comparative example, a scale residue was observed in any steel type, and descaling was insufficient.
以上説明したように、本発明によれば、酸洗促進剤やブラシロール等による過度な表面研削を用いることなく、スケールブレーカー、ショットブラスト、酸洗によってステンレス鋼熱延焼鈍鋼帯の脱スケールを行うことができる。 As described above, according to the present invention, descaling of a stainless steel hot-rolled annealed steel strip can be performed by scale breaker, shot blasting, and pickling without using excessive surface grinding with a pickling accelerator or a brush roll. It can be carried out.
Claims (2)
ベル焼鈍ステンレス鋼帯：５／３Ｃｒ２＋２００／３Ｃｒ＋７６０（ｋＪ／ｍ２）以上
連続焼鈍ステンレス鋼帯：５０（ｋＪ／ｍ２）以上
投射エネルギーは、０．５×投射密度×投射速度2である。
ここで式中のＣｒは、鋼材のＣｒ含有量（質量％）である。 A stainless steel strip manufactured by performing descaling by pickling treatment after performing shot blasting on the surface of the stainless hot-rolled annealed steel strip, the average particle size of the projection material being 0.25 to 0.80 mm, A method for producing a stainless steel strip in which the projection speed is 40 to 100 m / s, the projection energy is in the range of the following formula according to the annealing method and the Cr amount, and subsequently pickling.
Bell annealed stainless steel strip: 5 / 3Cr 2 + 200 / 3Cr + 760 (kJ / m 2) or more continuous annealing of stainless steel strip: 50 (kJ / m 2) or more projection energy is 0.5 × projection density × blasting speed 2 .
Here, Cr in the formula is the Cr content (% by mass) of the steel material.
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