JPH02310321A - Production of ferritic stainless steel strip - Google Patents
Production of ferritic stainless steel stripInfo
- Publication number
- JPH02310321A JPH02310321A JP12782889A JP12782889A JPH02310321A JP H02310321 A JPH02310321 A JP H02310321A JP 12782889 A JP12782889 A JP 12782889A JP 12782889 A JP12782889 A JP 12782889A JP H02310321 A JPH02310321 A JP H02310321A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- steel strip
- ferritic stainless
- annealing
- amount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- 238000000137 annealing Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000005097 cold rolling Methods 0.000 claims abstract description 7
- 230000007797 corrosion Effects 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 10
- 238000005452 bending Methods 0.000 abstract description 6
- 238000005098 hot rolling Methods 0.000 abstract description 3
- 238000005554 pickling Methods 0.000 abstract description 3
- 230000001276 controlling effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000010935 stainless steel Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 3
- 239000004566 building material Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000010408 film Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000002233 thin-film X-ray diffraction Methods 0.000 description 1
Landscapes
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野1
本発明は、外装用建材、特に薄板に成形加工されて屋根
葺材に使用されるフェライト系ステンレス鋼帯の製造方
法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a method for manufacturing an exterior building material, particularly a ferritic stainless steel strip that is formed into a thin plate and used as a roofing material.
[従来の技術1
ステンレス鋼板は外装用建材として、サツシ、カーテン
・ウオール、パネル等の比較的小さい面積で用いること
が多かった3しかし、近年、ステンレス鋼の持つ耐食性
、耐候性のよさが認識され、更にその施工技術の開発と
相伴って屋根材としても用いられるようになってきた。[Conventional technology 1] Stainless steel sheets were often used as exterior building materials in relatively small areas such as sash, curtain walls, and panels. 3 However, in recent years, stainless steel's excellent corrosion resistance and weather resistance have been recognized. Furthermore, along with the development of construction techniques, it has come to be used as a roofing material.
この場合、屋根材としては、ステンレス鋼板を素地とし
てこれに塗装着色した塗装ステンレス鋼板が用いられて
いる。これは、従来のトタン屋根では、塗膜劣化により
塗装に欠陥が生ずるとその後短期的に穴あきによる雨漏
りを生じて使用不能になるという欠点を克服しようとし
たものである。In this case, the roofing material is a painted stainless steel plate that is made of a stainless steel plate and is colored with paint. This is an attempt to overcome the drawback that with conventional tin roofs, if a defect occurs in the coating due to deterioration of the coating film, the roof will become unusable due to leakage due to holes in a short period of time.
この塗装ステンレス鋼板としては、主に、オーステナイ
ト系ステンレス鋼である5US304(18Cr−8N
i)が、その加工性のよさという点から採用されてき
た。This coated stainless steel plate is mainly made of 5US304 (18Cr-8N), which is an austenitic stainless steel.
i) has been adopted because of its good workability.
然しながら、上述の塗装ステンレス鋼板では、塗膜のた
め下地がステンレスかどうか外観上不明で、ステンレス
の持つ表面の美麗さや高級感が生かせないという欠点や
塗膜劣化に伴なう塗り直しなどのメンテナンスを必要と
するといった問題があった。また、オーステナイト系ス
テンレス鋼は高価なNiを多く含むため価格が高くなり
、需要を伸ばすことに困難がある。However, with the above-mentioned painted stainless steel sheets, it is unclear from the appearance whether the underlying material is stainless steel because of the coating film, and the disadvantage is that the beauty and luxury of the stainless steel surface cannot be taken advantage of. There was a problem that it required Furthermore, since austenitic stainless steel contains a large amount of expensive Ni, its price is high, making it difficult to increase demand.
しかし、無塗装のフェライト系ステンレス鋼を外装建材
、特に屋根材として用いる際には、10年以上の長期間
赤錆や海塩粒子の付着による孔食等の腐食を生じない充
分な屋外耐候性・耐食性が必然的に要求される。However, when unpainted ferritic stainless steel is used as an exterior building material, especially as a roofing material, it must have sufficient outdoor weather resistance and corrosion resistance such as red rust or pitting due to the adhesion of sea salt particles for a period of 10 years or more. Corrosion resistance is inevitably required.
また、オーステナイト系ステンレス鋼では本質的に加工
性が良いので比較的問題にならなかったが、フェライト
系ステンレス鋼では、例えば第1図に示したように屋根
材としての成形加工時に底板や側板が凹凸になるポケッ
トウェーブ(オイルキャンとも呼ぶ)という現象が現わ
れ易い、この現象は屋根としての外観を損なうので問題
になる。In addition, with austenitic stainless steel, it was relatively easy to work, so it was relatively non-problematic, but with ferritic stainless steel, for example, as shown in Figure 1, the bottom plate and side plates are easily formed during forming into roofing materials. Pocket waves (also called oil cans), which are uneven surfaces, tend to appear, and this phenomenon is a problem because it impairs the appearance of the roof.
[発明が解決しようとする課題J
本発明は、冷延工程で製造されたフェライト系ステンレ
ス鋼帯を、塗装することなく屋根材等として用いるため
、充分な屋外耐候性・耐食性を有し、且つポケットウェ
ーブ現象を伴うことなく成形加工ができる良好な加工性
を有するフェライト系ステンレス鋼帯とする方法を提供
することを目的とする。[Problem to be Solved by the Invention J] The present invention uses a ferritic stainless steel strip produced in a cold rolling process as a roofing material, etc. without painting, so it has sufficient outdoor weather resistance and corrosion resistance, and It is an object of the present invention to provide a method for producing a ferritic stainless steel strip having good workability and capable of being formed without pocket wave phenomenon.
〔課題を解決するための手段] 本発明は上記課題を解決するために。[Means to solve the problem] The present invention aims to solve the above problems.
Cr:11〜35重量%
を含有するフェライト系ステンレス鋼を冷延工程におけ
る仕上焼鈍後に、150〜550℃にて5〜60秒の曲
げ加工を行い、 j14帯の表面歪量を0.05〜0.
5%とするフェライト系ステンレス鋼帯の製造方法を提
供するものである。After finish annealing the ferritic stainless steel containing 11 to 35% by weight of Cr in the cold rolling process, bending was performed at 150 to 550°C for 5 to 60 seconds to reduce the surface strain of the j14 band to 0.05 to 0.05. 0.
5% of ferritic stainless steel strip.
〔作用J
一般にフェライト系ステンレス鋼帯は、熱間圧延した後
、焼鈍、酸洗され、−回または中間焼鈍をはさんだ2回
以上の冷間圧延後、仕上焼鈍、調質圧延を行って製品と
している。[Operation J Generally, ferritic stainless steel strips are hot rolled, then annealed and pickled, then cold rolled two or more times with - or intermediate annealing, and then finished annealed and temper rolled to produce a product. It is said that
本発明者らは、ステンレス鋼帯の成形加工において発生
する第2図に示した変形等について種々検討した結果、
下記の知見を得て本発明に到達したものである。As a result of various studies on the deformation shown in FIG. 2 that occurs during the forming process of stainless steel strips, the present inventors found that
The present invention was achieved by obtaining the following knowledge.
(1) ステンレス鋼板の機械的性質のうち鋼帯C方
向微少変形域での歪比(C方向引張試験での[引張方向
歪]/[幅方向歪]、以下単に歪比と記す)を大きくす
ると、曲げ加工部の残留引張応力が小に、底板圧縮応力
が小になり、その結果ポケットウェーブが少なくなる。(1) Among the mechanical properties of the stainless steel sheet, increase the strain ratio ([tensile direction strain]/[width direction strain] in the C direction tensile test, hereinafter simply referred to as strain ratio) in the steel strip C direction slight deformation region. Then, the residual tensile stress in the bent portion becomes small, the bottom plate compressive stress becomes small, and as a result, pocket waves are reduced.
(2) 鋼帯のC方向弾性限を高くすると、曲げ加工部
の変形領域が小に、底板圧縮応力が小になりこの結果ポ
ケットウェーブが少なくなる。(2) When the C-direction elastic limit of the steel strip is increased, the deformation region of the bent portion becomes smaller and the compressive stress of the bottom plate becomes smaller, resulting in fewer pocket waves.
すなわち、本発明の目的を達成するためには。That is, in order to achieve the purpose of the present invention.
屋外耐候性・耐食性があると共に、前記歪比が大きく1
弾性限の高いフェライト系ステンレス鋼帯を製造する必
要がある。It has outdoor weather resistance and corrosion resistance, and the strain ratio is large.
There is a need to produce a ferritic stainless steel strip with a high elastic limit.
本発明においてはCrを11〜35重量%含有するフェ
ライト系ステンレス鋼を使用するa Crの含有量が1
1重量%未満では屋外耐候性・耐食性が不十分であり、
35%を越えると屋外耐候性・耐食性の改善効果が飽和
してくると共に、成形加工性が低下し経済的でないので
11〜35重量%と限定した。In the present invention, a ferritic stainless steel containing 11 to 35% by weight of Cr is used.
If it is less than 1% by weight, outdoor weather resistance and corrosion resistance are insufficient.
If it exceeds 35%, the effect of improving outdoor weather resistance and corrosion resistance will be saturated, and the moldability will decrease, making it uneconomical, so it was limited to 11 to 35% by weight.
本発明に用いられるフェライト系ステンレス鋼としては
、前記Crのほかに、屋外耐候性・耐食性を向上させる
ために0.3〜4重量%のMOj15よび/または0.
3〜5重量%のCuを、さらに上記各線に成形性を向上
させるために1重量%以下のNbおよび/または1重量
%以下のTiを含有させてもよい。In addition to the above-mentioned Cr, the ferritic stainless steel used in the present invention contains 0.3 to 4% by weight of MOj15 and/or 0.3% by weight to improve outdoor weather resistance and corrosion resistance.
In addition to 3 to 5% by weight of Cu, each wire may further contain 1% by weight or less of Nb and/or 1% by weight or less of Ti in order to improve formability.
上記成分の鋼スラブは、通常の熱間圧延、熱延板焼鈍、
酸洗、中間焼鈍をはさんだ冷間圧延。Steel slabs with the above components can be produced by normal hot rolling, hot rolled plate annealing,
Cold rolling with pickling and intermediate annealing.
仕上焼鈍を行った後、150〜550℃にて5〜60秒
の曲げ加工を行い鋼帯の表面歪量を0.05〜0.5%
とする。After finishing annealing, bending is performed for 5 to 60 seconds at 150 to 550°C to reduce the surface strain of the steel strip by 0.05 to 0.5%.
shall be.
曲げ加工は例えばレベラーを使用して行うことができ、
i4帯の表面歪量は薄膜X線回折による(l l l)
面<112>方向の回折曲線の半価中より求められる。Bending can be carried out using a leveler, for example.
The amount of surface strain in the i4 band is determined by thin film X-ray diffraction (l l l)
It is determined from the half value of the diffraction curve in the plane <112> direction.
曲げ加工において、加工温度は150℃未満では効果が
不十分で、550℃を越えると炭窒化物析出の可能性が
あり不適であり、加工時間は5秒未満では効果が不十分
で、60秒を越えると効果は飽和となり、表面歪量は0
.05%未満では効果が不十分で、0.5%を越えると
板の形状が悪化して不適となり、加工温度、加工時間ま
たは表面歪量の何れか1つが前記限定範囲を逸脱すると
、十分な耐ポケットウェーブ性が得られない。In bending, if the processing temperature is less than 150°C, the effect is insufficient, if it exceeds 550°C, carbonitride precipitation may occur and it is unsuitable, and if the processing time is less than 5 seconds, the effect is insufficient; The effect becomes saturated when exceeding
.. If it is less than 0.5%, the effect is insufficient; if it exceeds 0.5%, the shape of the plate deteriorates and becomes unsuitable; if any one of the processing temperature, processing time, or amount of surface strain deviates from the above-mentioned limited range, the effect is insufficient. Pocket wave resistance cannot be obtained.
第1表に示した組成のフェライト系ステンレス鋼スラブ
に、通常の熱間圧延、熱延板焼鈍、酸洗、中間焼鈍をは
さんだ冷間圧延を行って厚さ0.8 m mの冷延鋼板
とし、これらの鋼板に1、 OOO℃Xi分の仕上焼鈍
を行った後、温間レベラーを用いて曲げ加工して鋼帯と
し、これらの鋼帯に対し酸洗、圧下率1%の調質圧延を
行った後、第2図に示した形状にロール成形加工を行っ
た。A ferritic stainless steel slab having the composition shown in Table 1 was cold-rolled to a thickness of 0.8 mm by performing normal hot rolling, hot-rolled plate annealing, pickling, and intermediate annealing. These steel plates were finished annealed for 1,000°C, and then bent using a warm leveler to form steel strips. These steel strips were then pickled and adjusted at a rolling reduction rate of 1%. After passing through rolling, roll forming was performed into the shape shown in FIG.
温間レベラー処理における温度、時間および表面歪量、
得られた鋼帯の成形加工性(C方向歪比、C方向弾性限
)、成形加工における耐ポケットウェーブ性(山高さ、
判定)を第1表に示した。Temperature, time and amount of surface strain in warm leveler treatment,
Formability of the obtained steel strip (C-direction strain ratio, C-direction elastic limit), pocket wave resistance during forming (crest height,
Judgment) are shown in Table 1.
[発明の効果J
本発明により屋外耐候性・耐食性が高く、成形加工工程
でポケットウェーブの発生の少いフェライト系ステンレ
ス鋼帯を製造することができた6[Effects of the Invention J According to the present invention, it was possible to produce a ferritic stainless steel strip that has high outdoor weather resistance and corrosion resistance, and generates fewer pocket waves during the forming process.6
第1図はポケットウェーブの発生状態を示す説明図、第
2図はロール圧延成形時の引張変形。
圧縮変形、残留圧縮の発生状態を示す説明図である。
l・・・底板
2−側板
3・・・ポケットウェーブFigure 1 is an explanatory diagram showing how pocket waves are generated, and Figure 2 is a diagram showing tensile deformation during roll rolling. FIG. 3 is an explanatory diagram showing the state of occurrence of compressive deformation and residual compression. l...Bottom plate 2-side plate 3...Pocket wave
Claims (1)
る仕上焼鈍後に、150〜550℃にて5〜60秒の曲
げ加工を行い、鋼帯の表面歪量を0.05〜0.5%と
することを特徴とするフェライト系ステンレス鋼帯の製
造方法。[Claims] 1 After finish annealing a ferritic stainless steel containing 11 to 35% by weight of Cr in a cold rolling process, the surface of the steel strip is bent at 150 to 550°C for 5 to 60 seconds. A method for manufacturing a ferritic stainless steel strip, characterized in that the amount of strain is 0.05 to 0.5%.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12782889A JPH02310321A (en) | 1989-05-23 | 1989-05-23 | Production of ferritic stainless steel strip |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12782889A JPH02310321A (en) | 1989-05-23 | 1989-05-23 | Production of ferritic stainless steel strip |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02310321A true JPH02310321A (en) | 1990-12-26 |
Family
ID=14969672
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12782889A Pending JPH02310321A (en) | 1989-05-23 | 1989-05-23 | Production of ferritic stainless steel strip |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02310321A (en) |
-
1989
- 1989-05-23 JP JP12782889A patent/JPH02310321A/en active Pending
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