JPH0711063B2 - Manufacturing method of austenitic stainless steel - Google Patents
Manufacturing method of austenitic stainless steelInfo
- Publication number
- JPH0711063B2 JPH0711063B2 JP62023614A JP2361487A JPH0711063B2 JP H0711063 B2 JPH0711063 B2 JP H0711063B2 JP 62023614 A JP62023614 A JP 62023614A JP 2361487 A JP2361487 A JP 2361487A JP H0711063 B2 JPH0711063 B2 JP H0711063B2
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- boron nitride
- austenitic stainless
- boron
- heat treatment
- 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
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims description 12
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- 229910052582 BN Inorganic materials 0.000 claims description 23
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 23
- 229910052757 nitrogen Inorganic materials 0.000 claims description 17
- 229910052796 boron Inorganic materials 0.000 claims description 15
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 5
- 229910021529 ammonia Inorganic materials 0.000 claims description 4
- 238000000151 deposition Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 description 17
- 238000001556 precipitation Methods 0.000 description 10
- 239000012530 fluid Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000004320 controlled atmosphere Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000001192 hot extrusion Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910015215 MoBN Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000001420 photoelectron spectroscopy Methods 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Description
【発明の詳細な説明】 「発明の目的」 （産業上の利用分野） 気体または液体の高純度流体と接触し、該流体自体また
は不純物の吸着を阻止する能力を有し、しかも加工性に
優れたオーステナイトステンレス鋼材の製造技術。DETAILED DESCRIPTION OF THE INVENTION "Purpose of the Invention" (Field of Industrial Application) It has the ability to come into contact with a high-purity fluid such as gas or liquid and prevent adsorption of the fluid itself or impurities, and is excellent in processability. Austenitic stainless steel manufacturing technology.
（従来の技術） 高純度流体容器やその配管あるいは雰囲気調整室（クリ
ーンルーム）ないし該調整室で利用される機器、作業台
などにおいてオーステナイト鋼の表面に窒化ボロンを生
成させることについては従来からそれなりの提案ないし
発表がなされている。(Prior Art) For producing boron nitride on the surface of austenitic steel in a high-purity fluid container, its piping, an atmosphere control room (clean room), equipment used in the control room, a workbench, etc. Suggestions or announcements have been made.
即ち特開昭60-36648号公報においてはオーステナイト系
ステンレス鋼の成分に、Ｎを0.1〜0.3％、Ｂを0.005〜
0.02％、Ceを0.001〜0.1％を添加した合金を真空中で加
熱し、表面に窒化ボロン皮膜を析出させることが発表さ
れている。That is, in JP-A-60-36648, the composition of austenitic stainless steel contains 0.1 to 0.3% N and 0.005 to B.
It has been announced that an alloy containing 0.02% and 0.001 to 0.1% Ce is heated in a vacuum to deposit a boron nitride film on the surface.
又特開昭61-194171号公報ではモリブデン及び窒化ボロ
ンをターゲットとして用い、高周波大パッタ法で基板上
にMoBN膜を形成し、これを真空中で500〜1000℃に加熱
して表面に窒化ボロンを析出させることが記載されてい
る。In Japanese Patent Laid-Open No. 61-194171, molybdenum and boron nitride are used as targets, and a MoBN film is formed on the substrate by a high frequency large patterner method. Is described.
更に日本金属学会誌vol.47、No.11（1983）の941頁には
ＢとＮを添加した18−８ステンレス鋼表面での窒化ホウ
素の析出挙動が報告されている。Furthermore, the precipitation behavior of boron nitride on the surface of 18-8 stainless steel containing B and N is reported on page 941 of the Japan Institute of Metals, Vol. 47, No. 11 (1983).
（発明が解決しようとする問題点） しかし上記したような従来のものは溶製によってボロン
及び窒素を鋼中に含有させた鋼塊とし、これを熱間押出
しまたは熱延工程で管または板とし、これを真空熱処理
して表面に窒化ボロンを析出させるものであるから、上
記のようにボロンおよび窒素を含有した鋼は熱間加工性
が低下し、加工時に割れ、疵などを発生し易い欠点があ
る。(Problems to be solved by the invention) However, the conventional one as described above is made into a steel ingot in which boron and nitrogen are contained in steel by melting, and this is made into a tube or a plate by a hot extrusion or hot rolling process. However, since it is subjected to vacuum heat treatment to deposit boron nitride on the surface, the steel containing boron and nitrogen as described above has poor hot workability, and cracks and flaws are likely to occur during processing. There is.
このためボロン、窒素の含有量を制限し、熱間加工性の
向上を図ることも考えられるが、この場合には窒化ボロ
ンを析出させるべく真空中の熱処理を行っても充分な窒
化ボロンが析出せず、あるいはその析出に長時間を必要
とし、工業的でない欠点が生じて来る。Therefore, it is possible to limit the contents of boron and nitrogen to improve the hot workability, but in this case, sufficient boron nitride is deposited even if heat treatment in vacuum is performed to precipitate boron nitride. Not, or it takes a long time for its precipitation, and non-industrial drawbacks occur.
「発明の構成」 （問題点を解決するための手段） 本発明は前記したような従来のものの問題点を解消する
ように検討して創案されたもので、ボロンを0.001〜0.1
wt％含有したオーステナイト鋼を75％以上の窒素または
85％以上のアンモニア含有ガス中で700℃超の熱処理を
なし、表面被覆率70％以上の窒化ボロンを析出させるこ
とを特徴とするオーステナイトステンレス鋼材の製造法
である。[Structure of the Invention] (Means for Solving Problems) The present invention was devised to solve the above-mentioned problems of the conventional ones, and was devised with a boron content of 0.001 to 0.1.
Austenitic steel containing wt% of 75% or more nitrogen or
This is a method for producing an austenitic stainless steel material, characterized by performing heat treatment at 700 ° C or higher in a gas containing 85% or more of ammonia to deposit boron nitride having a surface coverage of 70% or more.
（作用） オーステナイトステンレス鋼にwt％（以下単に％とい
う）で、ボロンを0.001％以上含有させることにより窒
素またはアンモニア含有ガス中での窒化ボロン析出を適
切に行わせ得、表面被覆率75％以上の窒化ボロンが形成
されたオーステナイトステンレス鋼を適切に得しめ、耐
食性に優れたオーステナイトステンレス鋼材とする。な
おこのボロンを0.1％以下とすることにより1000℃以上
の熱間加工性を低下させることなく、熱間加工時におけ
る割れや疵などの発生を防止する。また窒素については
この種ステンレス鋼として通常記載しない0.1％以下で
ある。(Function) By adding 0.001% or more of boron in wt% (hereinafter simply referred to as%) to austenitic stainless steel, boron nitride can be properly deposited in a gas containing nitrogen or ammonia, and the surface coverage is 75% or more. The austenitic stainless steel on which boron nitride is formed is appropriately obtained, and the austenitic stainless steel material having excellent corrosion resistance is obtained. By adjusting the content of boron to 0.1% or less, the occurrence of cracks or flaws during hot working is prevented without deteriorating the hot workability at 1000 ° C or higher. The nitrogen content is 0.1% or less, which is not usually described for this type of stainless steel.
本発明によるものは75％以上の窒素含有雰囲気または85
％以上のアンモニア含有ガス雰囲気での真空熱処理によ
り均一な窒化ボロンの生成を得しめるものであるからオ
ーステナイトステンレス鋼に窒素を含有させることを必
要としない。このオーステナイトステンレス鋼にボロン
が含有されることにより熱間加工性が低下し好ましい製
品が得難くなることは上記の通りであり、窒素が含有さ
れるとしても0.05％以下とすべきである。According to the present invention, an atmosphere containing 75% or more of nitrogen or 85
%, It is not necessary to add nitrogen to the austenitic stainless steel because it is possible to obtain uniform boron nitride by vacuum heat treatment in a gas atmosphere containing ammonia of not less than%. As described above, the inclusion of boron in this austenitic stainless steel reduces the hot workability and makes it difficult to obtain a preferable product. Even if nitrogen is contained, it should be 0.05% or less.
更にこの熱処理条件として700℃超えとすることにより
熱処理時間を短縮し、有利且つ的確に窒化ボロンが生成
し、表面被覆率の高い窒化ボロンを有効に形成する。工
業的には工程中での加工硬化除去または固溶化熱処理を
兼ねて行うことが望ましく、1000℃以上、10分以上で後
工程の真空熱処理により充分な窒化ボロン析出が達成で
きる。熱処理温度の上限については組成および加工条件
によってそれなりに変動するが、一般的には1200℃程度
である。なおこの熱処理中に酸素、一酸化酸素、二酸化
炭素などが雰囲気中に混入したならば窒化ボロンの析出
が抑制され、目的とする析出状態を得ることができな
い。Further, as the heat treatment condition is set to exceed 700 ° C., the heat treatment time is shortened, boron nitride is produced advantageously and appropriately, and boron nitride having a high surface coverage is effectively formed. Industrially, it is desirable to perform both work hardening removal and solution heat treatment during the process, and sufficient boron nitride precipitation can be achieved by a vacuum heat treatment in a subsequent process at 1000 ° C. or higher for 10 minutes or longer. The upper limit of the heat treatment temperature varies depending on the composition and processing conditions, but is generally about 1200 ° C. If oxygen, oxygen monoxide, carbon dioxide, etc. are mixed into the atmosphere during this heat treatment, the precipitation of boron nitride is suppressed and the desired precipitation state cannot be obtained.
上記のようにボロンを適切な範囲内で含有したオーステ
ナイトステンレス鋼を制御された雰囲気中で熱処理する
ことにより窒化ボロンの均一析出が短時間内に可能とな
る。しかも窒素を実質的に含有しないことにより鋼の熱
間加工性を改善し、加工を適切に行った健全な製品を提
供し得ることが確認された。オーステナイトステンレス
鋼のような合金鋼は通常ビレットまたはスラブを熱間加
工−冷間−熱処理−酸洗あるいは冷間加工−熱処理の工
程を繰返すことにより製造される。窒化ボロンを表面に
析出させる場合は、さらに真空中での熱処理もしくは表
面研磨を施したのち真空中の熱処理を行うもので、本発
明ではこの熱処理を前述のように制御された雰囲気で行
うことにより、溶製法で鋼中に窒素を含有させることを
なからしめ鋼の熱間加工性を改善し、且つ窒化ボロン析
出のための真空中熱処理時間を大幅に短縮することは上
記の通りである。By heat-treating austenitic stainless steel containing boron in an appropriate range as described above in a controlled atmosphere, uniform precipitation of boron nitride is possible within a short time. In addition, it was confirmed that by not containing nitrogen substantially, the hot workability of steel can be improved and a sound product that has been appropriately processed can be provided. Alloy steels such as austenitic stainless steels are usually manufactured by repeating the steps of hot working-cold-heat treatment-pickling or cold working-heat treatment of billets or slabs. When depositing boron nitride on the surface, further heat treatment in vacuum or surface polishing is performed, and then heat treatment in vacuum is performed.In the present invention, this heat treatment is performed in a controlled atmosphere as described above. The fact that nitrogen is contained in the steel by the melting method improves the hot workability of the steel, and significantly shortens the heat treatment time in vacuum for precipitation of boron nitride, as described above.
（実施例） SUS304、316および310相当の成分組成のものに対し次の
第１表に示すようにボロンを含有させた鋼を溶製した。
比較材としては従来法に従いボロンと共に窒素を含有さ
せたものを同様に溶製した。(Example) Steels containing boron as shown in Table 1 below were melted with respect to component compositions corresponding to SUS304, 316 and 310.
As a comparative material, a material containing nitrogen together with boron was similarly prepared by the conventional method.
これらの各オーステナイトステンレス鋼について次の第
２表に示すような寸法を有する鋼管を夫々製造し、これ
らの各鋼管について実施した熱処理条件およびそれによ
って得られた製品表面における窒化ボロン被覆率をＸ線
光電子分光法により求めた結果と、それらの本発明材お
よび比較材に関する熱押し加工結果を併せて示すと次の
第２表の如くであった。 For each of these austenitic stainless steels, steel pipes having dimensions as shown in Table 2 below were manufactured, and the heat treatment conditions performed for each of these steel pipes and the boron nitride coverage on the product surface obtained thereby were determined by X-ray. Table 2 below shows the results obtained by photoelectron spectroscopy and the hot-pressing results for the inventive material and the comparative material.
即ち比較例に明らかなように溶製時にボロンと共に窒素
を含有させたものは何れも熱間押出し結果において表面
疵または割れ等が認められるのに対し、本発明に従いボ
ロンのみが含有されたものにおいては何れも良好な熱間
加工性を示している。又本発明によるものは窒化ボロン
の析出熱処理により何れも十分な窒化ボロンの析出を認
め得るが、比較例においては不充分である。 That is, as is clear from the comparative examples, any of those containing nitrogen together with boron during melting show surface defects or cracks in the results of hot extrusion, while those containing only boron according to the present invention. All show good hot workability. In the case of the present invention, sufficient precipitation of boron nitride can be recognized by the heat treatment for precipitation of boron nitride, but it is insufficient in the comparative example.
なおこの実施例は管について行ったものであるが、鋼材
の形状、構造としてはこれに限定されるものでないこと
は当然で、板材や形材、棒材などに適用した場合におい
ても同様の結果が得られた。Although this example was performed on a pipe, it is obvious that the shape and structure of the steel material are not limited to this, and the same results are obtained when applied to a plate material, a shape material, a bar material, or the like. was gotten.
「発明の効果」 以上説明したような本発明によるときは窒素を実質的に
含有せしめることなしに窒化ボロンの析出を適切に図り
表面被覆率が高く耐食性に優れると共に熱間加工性にも
優れたオーステナイトステンレス鋼を提供して高純度流
体容器や機器ないしクリーンルームなどに使用するに適
した製品を得しめ、また前記ボロンの析出処理を著しく
短縮せしめ、従来熱間加工時において割れや疵等が発生
し健全な製品を得ることの困難であったこの種合金鋼材
における不利を解消して加工性に優れ、高純度流体と接
触して流体自体または不純物の吸着を有効に阻止する各
種製品を提供し得るものであって、近時における高性能
プロセスなどにおいて要請される条件を適切に満足し得
るものであるから工業的にその効果の大きい発明であ
る。"Effects of the Invention" According to the present invention as described above, boron nitride is appropriately deposited without substantially containing nitrogen, the surface coverage is high, the corrosion resistance is excellent, and the hot workability is also excellent. Providing austenitic stainless steel to obtain a product suitable for use in high-purity fluid containers, equipment or clean rooms, etc., and significantly shortening the boron precipitation process, causing cracks and flaws during conventional hot working We provide various products that eliminate the disadvantages of this type of alloy steel that was difficult to obtain a sound product and have excellent workability and that effectively prevent adsorption of the fluid itself or impurities by contacting with a high-purity fluid. This is an invention that is industrially highly effective because it can appropriately satisfy the conditions required in recent high-performance processes and the like.
Claims (1)
ナイト鋼を75％以上の窒素または85％以上のアンモニア
含有ガス中で700℃超の熱処理をなし、表面被覆率70％
以上の窒化ボロンを析出させることを特徴とするオース
テナイトステンレス鋼材の製造法。1. An austenitic steel containing 0.001 to 0.1 wt% of boron is heat-treated at a temperature of more than 700 ° C. in a gas containing 75% or more of nitrogen or 85% or more of ammonia, and the surface coverage is 70%.
A method for producing an austenitic stainless steel material, which comprises depositing the above boron nitride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62023614A JPH0711063B2 (en) | 1986-12-16 | 1987-02-05 | Manufacturing method of austenitic stainless steel |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61-297697 | 1986-12-16 | ||
| JP29769786 | 1986-12-16 | ||
| JP62023614A JPH0711063B2 (en) | 1986-12-16 | 1987-02-05 | Manufacturing method of austenitic stainless steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63266057A JPS63266057A (en) | 1988-11-02 |
| JPH0711063B2 true JPH0711063B2 (en) | 1995-02-08 |
Family
ID=26361008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62023614A Expired - Lifetime JPH0711063B2 (en) | 1986-12-16 | 1987-02-05 | Manufacturing method of austenitic stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0711063B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH682492A5 (en) * | 1990-09-10 | 1993-09-30 | Biennaform Walzprofil Ag | Prodn. of steel profiles esp. for ski edges - involves nitriding of steel followed by cold working to produce austenitic steel having high strength, toughened and corrosion resistance |
| JP6452340B2 (en) * | 2014-06-30 | 2019-01-16 | 国立大学法人群馬大学 | Metal curing method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59143076A (en) * | 1983-02-04 | 1984-08-16 | Kawasaki Steel Corp | Manufacture of material for pipe forming tool |
| JPS6036648A (en) * | 1983-08-09 | 1985-02-25 | Natl Res Inst For Metals | Material for high vacuum vessel |
-
1987
- 1987-02-05 JP JP62023614A patent/JPH0711063B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63266057A (en) | 1988-11-02 |
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