JPH0772327B2 - Ferrite stainless steel with excellent overhang and weldability - Google Patents
Ferrite stainless steel with excellent overhang and weldabilityInfo
- Publication number
- JPH0772327B2 JPH0772327B2 JP62233556A JP23355687A JPH0772327B2 JP H0772327 B2 JPH0772327 B2 JP H0772327B2 JP 62233556 A JP62233556 A JP 62233556A JP 23355687 A JP23355687 A JP 23355687A JP H0772327 B2 JPH0772327 B2 JP H0772327B2
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- less
- weldability
- heat
- overhang
- 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.)
- Expired - Lifetime
Links
- 229910001220 stainless steel Inorganic materials 0.000 title claims description 13
- 239000010935 stainless steel Substances 0.000 title claims description 9
- 229910000859 α-Fe Inorganic materials 0.000 title claims description 5
- 229910000734 martensite Inorganic materials 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 8
- 239000012535 impurity Substances 0.000 claims description 2
- 230000003647 oxidation Effects 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 7
- 238000005097 cold rolling Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000000137 annealing Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000010953 base metal Substances 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Landscapes
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は張り出し性及び溶接部加工性に優れたフエライ
ト系ステンレス鋼に係り、特に熱延板焼純を必要とせず
安価に製造できるフエライト系ステンレス鋼に関し、石
油燃焼機器や自動車排気系装置等耐熱性、耐酸化性及び
耐食性の要求される用途の中でも特に張り出し性及び溶
接部加工性を必要とする分野に利用される。Description: TECHNICAL FIELD The present invention relates to a ferrite type stainless steel excellent in overhanging property and weldability, and in particular, a ferrite type stainless steel which can be manufactured at a low cost without requiring hot-rolled plate annealing. Regarding stainless steel, it is used in fields requiring heat resistance, oxidation resistance, and corrosion resistance, such as oil combustion equipment and automobile exhaust system equipment, and particularly in fields requiring overhang and weldability.
〔従来の技術〕 従来、フエライト系ステンレス鋼は耐熱耐酸化材料とし
て用いられることが多い。耐熱用途にはCr濃度の高い
程、あるいはSi、Alの添加されたもの程、耐酸化性が向
上し高温での使用が可能になるが、逆にこれらの元素が
増加すると加工性、特に張り出し性が低下する。この張
り出し性の低さが、フエライト系ステンレス鋼の用途を
限定する大きな原因の一つとなつている。[Prior Art] Conventionally, ferritic stainless steel is often used as a heat and oxidation resistant material. For heat resistant applications, the higher the Cr concentration or the addition of Si or Al, the higher the oxidation resistance and the higher the temperature that can be used, but conversely, if these elements increase, the workability, especially the overhang Sex decreases. This low bulging property is one of the major reasons for limiting the applications of ferritic stainless steel.
張り出し性を高めるため、TiあるいはAlの一方、または
両方を添加することは既に公知であり、例えば特開昭56
−123351、特開昭58−61258において、Ti、Alの複合添
加がなされているが、その製造工程で熱延板焼純（母板
焼純）を行わなければならない。It is already known to add one or both of Ti and Al in order to enhance the overhanging property.
-123351 and Japanese Patent Application Laid-Open No. 58-61258, a composite addition of Ti and Al is made, but in the manufacturing process, hot-rolled plate baking (mother plate baking) must be performed.
また、特開昭51−126617においては冷間圧下率80％以
上、もしくは冷間圧延後中間焼純を行い、その後再び冷
間圧延を行つている。このような、母板焼純、高冷間圧
下率、中間焼純は工程の作業能率を著しく低下させる。
一方、母板焼純省略については、例えば特開昭57−7022
3において、Ti、Alの複合添加が行われているが、その
特許請求の範囲の広さにもかかわらず、実施例はすべて
16〜17％Crである。一方、低Cr系ステンレス鋼の場合に
は、Ti、Alを添加した場合でさえ、溶接の際、ビート部
あるいは熱影響部にマルテンサイト相が発生しやすく、
そのため耐食性が劣化するという問題がある。Further, in JP-A-51-126617, cold rolling reduction is 80% or more, or intermediate rolling is performed after cold rolling, and then cold rolling is performed again. Such mother plate annealing, high cold rolling reduction, and intermediate annealing reduce the work efficiency of the process remarkably.
On the other hand, regarding the omission of pure mother board, for example, JP-A-57-7022
In 3, the composite addition of Ti and Al is carried out, but in spite of the broad scope of the claims, all the examples are
16 to 17% Cr. On the other hand, in the case of low Cr stainless steel, even when Ti and Al are added, martensite phase is likely to occur in the beat part or the heat affected part during welding,
Therefore, there is a problem that the corrosion resistance deteriorates.
本発明の目的は、上記従来技術の問題点を解決し、熱延
板焼純を省略し、更に50％程度の低冷間圧下率でも張り
出し性及び溶接部加工性を改善し、溶接部にマルテンサ
イト相を発生しないフエライト系ステンレス鋼を提供す
るにある。The object of the present invention is to solve the above-mentioned problems of the prior art, omit the hot-rolled plate refining, further improve the overhangability and weldability of the welded portion even at a low cold rolling reduction of about 50%, and It is to provide a ferritic stainless steel that does not generate a martensite phase.
本発明の要旨とするところは次の如くである。 The gist of the present invention is as follows.
すなわち、 重量比にて C:0.02％以下 Si:0.8％以下 Mn:0.8％以下 Cr:10〜15％ Ni:0.6％以下 Ti:0.01〜15（Ｃ＋Ｎ）％ N:0.02％以下 Al:0.05超〜0.3％ を含み、かつ の関係を満足し、残部が不可避的に混入する不純物とFe
より成り、熱延板焼純が省略可能で、溶接時熱影響部ま
たはビート部にマルテンサイト相が発生しないことを特
徴とする張り出し性及び溶接部加工性に優れたフエライ
ト系ステンレス鋼である。That is, by weight ratio, C: 0.02% or less Si: 0.8% or less Mn: 0.8% or less Cr: 10 to 15% Ni: 0.6% or less Ti: 0.01 to 15 (C + N)% N: 0.02% or less Al: more than 0.05 ~ 0.3%, and And the balance is inevitable impurities and Fe.
It is a ferritic stainless steel excellent in overhangability and weldability, which is characterized in that the hot-rolled sheet can be omitted and the martensite phase does not occur in the heat-affected zone or beat zone during welding.
本発明者らは、耐熱ステンレス鋼の成分に関し広域な範
囲の見直しを行つた結果、成分バランスと材料特性との
関係を見出し本発明を完成することができた。As a result of reviewing a wide range of the components of the heat resistant stainless steel, the present inventors have found the relationship between the component balance and the material properties, and have completed the present invention.
本発明における成分限定理由について説明する。The reasons for limiting the components in the present invention will be described.
Ｃ、N: Ｃは耐酸化性を低下させ、また靭性も低下させるため低
い所望ましく、Ｎも靭性を低下させる。Ｃ、Ｎの悪影響
はTi、Alの添加により緩和されるが、Ｃ＋Ｎの量が増加
するとTi炭窒化物が増加し、鋼の清浄度を低下させ靭
性、加工性を低下させるため、Ｃ、Ｎ共に0.02％以下に
限定した。C, N: C lowers the oxidation resistance and also lowers the toughness, so a low content is desirable, and N also lowers the toughness. The adverse effects of C and N are mitigated by the addition of Ti and Al, but as the amount of C + N increases, Ti carbonitride increases, which lowers the cleanliness of steel and reduces toughness and workability. Both were limited to 0.02% or less.
Si: Siは耐酸化性を高めるのに有効であるが、0.8％を越す
と靭性を低下させるので0.8％以下に限定した。Si: Si is effective in increasing the oxidation resistance, but if it exceeds 0.8%, the toughness decreases, so it was limited to 0.8% or less.
Mn: Mnは強度を高めるのに有効であるが、多量に含有すると
靭性、加工性を損なうので0.8％以下に限定した。Mn: Mn is effective for increasing the strength, but if it is contained in a large amount, the toughness and workability are impaired, so the content is limited to 0.8% or less.
Cr: Crは耐熱ステンレス鋼として必須の元素であり、10％未
満では十分な耐酸化性が得らけず、一方、15％は越える
と十分な張り出し性が確保できないので、10〜15％の範
囲とした。Cr: Cr is an essential element for heat-resistant stainless steel. If it is less than 10%, sufficient oxidation resistance cannot be obtained, while if it exceeds 15%, sufficient overhang cannot be secured. And
Ni: Niは靭性を向上させるが、0.6％を越えると耐酸化性を
低下させるため上限を0.6％とした。Ni: Ni improves toughness, but if it exceeds 0.6%, the oxidation resistance decreases, so the upper limit was made 0.6%.
Ti: Tiは炭窒化物生成元素であり、Ｃ、Ｎと結合して固溶
Ｃ、Ｎ及びCr炭窒化物の生成を抑制し靭性を向上させる
ため少なくとも0.01％以上が必要である。しかし多量の
添加は逆に固溶したTiのため靭性が低下し、かつコスト
高となるため15×（Ｃ×Ｎ）％以下とした。Ti: Ti is a carbonitride forming element, and is required to be at least 0.01% or more in order to combine with C and N to suppress the formation of solute C, N and Cr carbonitrides and improve the toughness. However, if a large amount is added, on the contrary, the solid solution of Ti lowers the toughness and increases the cost, so the content was made 15 × (C × N)% or less.
Al: AlはTiとの相互作用により適切なTi、Al複合添加を行え
ば張り出し性及び溶接部を含む加工性を向上させるた
め、少くとも0.05％超が必要である。しかし、0.3％を
越える添加は固溶硬化のため張り出し性を低下させるの
で0.3％以下に限定した。Al: Al needs to be at least 0.05% or more in order to improve the overhanging property and the workability including the welded part by appropriately adding Ti and Al in combination by interacting with Ti. However, if over 0.3% is added, solid solution hardening will occur and the bulging property will be deteriorated.
更に上記の成分限定範囲の組成において、 を０以上とすることにり張り出し性及び溶接部を含む伸
びの向上が得られる。一方、溶接の際熱影響部またはビ
ード部でのマルテンサイト相の発生は耐食性の劣化を招
くため、その防止のため を２×10-3以下に限定しなければならない。Furthermore, in the composition of the above-mentioned component limited range, When the ratio is 0 or more, the overhang property and the elongation including the welded portion can be improved. On the other hand, the occurrence of martensite phase in the heat-affected zone or bead during welding causes deterioration of corrosion resistance. Must be limited to 2 × 10 -3 or less.
第１表に示す成分の実験鋼塊を作成し熱間圧延により3m
m厚の熱延鋼板とし、次に焼純を行わずに酸洗、冷間圧
延により1.5mm厚とし、900℃で仕上焼純及び酸洗を行
い、母材の張り出し性、溶接部伸び性及び溶接部の組織
を調査し結果を第１図及び第２図に示した。溶接部伸び
は溶接速度600mm/minに対し、溶接電流を90〜160Aの範
囲内で10A毎に変化させた時の良好なビー ドが得られた条件で第３図に示した如きサイズの引張試
験片を作成し、ゲージ長さ25mmとしその平均破断伸びで
表わした。なお、TIG溶接は2.4mm径のTh−Ｗ電極を用
い、アーク長は2mmとした。3m was prepared by hot rolling of experimental steel ingots with the components shown in Table 1.
m hot-rolled steel sheet, then pickled without tempering, cold-rolled to 1.5 mm thickness, finish-fired and pickled at 900 ° C, overhang of base metal, extensibility of weld zone The structure of the weld and the weld was investigated and the results are shown in FIGS. 1 and 2. The weld elongation is good when the welding speed is 600 mm / min and the welding current is changed in the range of 90 to 160 A in steps of 10 A. A tensile test piece having a size as shown in FIG. 3 was prepared under the condition that the cord was obtained, and the gauge length was 25 mm, which was expressed by the average elongation at break. The TIG welding used a Th-W electrode with a diameter of 2.4 mm and an arc length of 2 mm.
第１図は成分バランスパラメーター を横軸とし、溶接部を含む破断伸び及び溶接部のマルテ
ンサイト相の有無を示したものである。なお、各表示点
に付けた数字は供試材No.を示したものである。本発明
実施例はいずれもマルテンサイト相が発生せず平均破断
伸びも26％以上で良好である。Fig. 1 shows the component balance parameter The horizontal axis represents, and the elongation at break including the welded portion and the presence or absence of the martensite phase in the welded portion are shown. The number attached to each display point indicates the sample material No. In each of the examples of the present invention, no martensite phase is generated and the average elongation at break is 26% or more, which is good.
第２図は成分バランスパラメーター を横軸に取り、張り出し性として加工硬化係数ｎ値を縦
軸に取って表示したが、成分バランスパラメーターが０
〜２×10-3の範囲の本発明実施例は優れたｎ値を示して
いる。Fig. 2 shows the component balance parameter Is plotted on the horizontal axis, and the work hardening coefficient n value is plotted on the vertical axis as the overhanging property.
The inventive examples in the range of up to 2 × 10 -3 show excellent n values.
本発明は上記実施例からも明らかな如く、フエライト系
ステンレス鋼の成分を限定し成分バランスを調製するこ
とによつて、熱延板焼純を省略しても、母材張り出し性
及び溶接部を含む加工性に優れ、溶接の際、熱影響部ま
たはビード部においてマルテンサイト相の発生を防ぎ、
その結果耐食性の劣化を防ぐことができた。The present invention is clear from the above examples, by limiting the components of the ferrite stainless steel and adjusting the component balance, the hot rolling of the hot rolled sheet can be omitted and the base metal overhanging property and welded portion can be improved. It has excellent workability and prevents the occurrence of martensite phase in the heat affected zone or bead during welding.
As a result, deterioration of corrosion resistance could be prevented.
第１図は成分バランスパラメーターと溶接部を含む伸び
及びマルテンサイト相発生の有無との関係を示す線図、
第２図は成分バランスパラメーターとｎ値との関係を示
す線図、第３図は引張試験片の形状及び寸法を示す平面
図である。FIG. 1 is a diagram showing the relationship between the component balance parameters and the presence or absence of elongation and martensite phase including welds,
FIG. 2 is a diagram showing the relationship between the component balance parameter and n value, and FIG. 3 is a plan view showing the shape and dimensions of tensile test pieces.
Claims (1)
より成り、熱延板焼純が省略可能で、溶接時熱影響部ま
たはビート部にマルテンサイト相が発生しないことを特
徴とする張り出し性及び溶接部加工性に優れたフエライ
ト系ステンレス鋼。1. By weight ratio, C: 0.02% or less Si: 0.08% or less Mn: 0.8% or less Cr: 10 to 15% Ni: 0.6% or less Ti: 0.01 to 15 (C + N)% N: 0.02% or less Al :> 0.05 to 0.3%, and And the balance is inevitable impurities and Fe.
Ferrite-based stainless steel excellent in overhangability and weldability, which is characterized in that the heat-rolled sheet can be omitted and that no martensite phase is generated in the heat-affected zone or beat zone during welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62233556A JPH0772327B2 (en) | 1987-09-17 | 1987-09-17 | Ferrite stainless steel with excellent overhang and weldability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62233556A JPH0772327B2 (en) | 1987-09-17 | 1987-09-17 | Ferrite stainless steel with excellent overhang and weldability |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11002399A Division JP3025490B2 (en) | 1999-01-08 | 1999-01-08 | Ferritic stainless steel with excellent overhang and weldability |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6475652A JPS6475652A (en) | 1989-03-22 |
| JPH0772327B2 true JPH0772327B2 (en) | 1995-08-02 |
Family
ID=16956915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62233556A Expired - Lifetime JPH0772327B2 (en) | 1987-09-17 | 1987-09-17 | Ferrite stainless steel with excellent overhang and weldability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0772327B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100547536B1 (en) | 2002-03-27 | 2006-01-31 | 신닛뽄세이테쯔 카부시키카이샤 | Cast member and steel plate of ferritic stainless steel and manufacturing method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0617519B2 (en) * | 1986-02-27 | 1994-03-09 | 日新製鋼株式会社 | Method for producing steel plate or strip of ferritic stainless steel with good workability |
-
1987
- 1987-09-17 JP JP62233556A patent/JPH0772327B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6475652A (en) | 1989-03-22 |
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