JPH05125490A - Deposition hardening type stainless steel - Google Patents
Deposition hardening type stainless steelInfo
- Publication number
- JPH05125490A JPH05125490A JP31145291A JP31145291A JPH05125490A JP H05125490 A JPH05125490 A JP H05125490A JP 31145291 A JP31145291 A JP 31145291A JP 31145291 A JP31145291 A JP 31145291A JP H05125490 A JPH05125490 A JP H05125490A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- toughness
- strength
- corrosion resistance
- less
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、優れた耐食性と強度
を損なうことなく、さらに靱性を向上させた析出硬化型
ステンレス鋼に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precipitation hardening stainless steel having improved toughness without impairing excellent corrosion resistance and strength.
【０００２】[0002]
【従来の技術】周知のように、Ｃrを多量に添加したス
テンレス鋼は、他の鉄鋼材料に比べて優れた耐食性を有
しており、腐食環境下で、広く使用されている。ところ
で、一般にステンレス鋼は、マルテンサイト系を除い
て、引張強度は４０〜６０kg/mm2程度であり、引張強度
が５０〜１００kg/mm2程度、あるいはこれ以上の高強度
鋼に比べて、強度の点で劣っている。また、マルテンサ
イト系ステンレス鋼は、高い強度を有するものの、耐食
性の点では、他のステンレス鋼に比べ大きく劣ってい
る。2. Description of the Related Art As is well known, stainless steel containing a large amount of Cr has superior corrosion resistance to other steel materials and is widely used in corrosive environments. By the way, generally, stainless steel has a tensile strength of about 40 to 60 kg / mm 2 except for martensitic steels, and a tensile strength of about 50 to 100 kg / mm 2 or higher than that of high strength steel. Is inferior in terms of. Although martensitic stainless steel has high strength, it is much inferior to other stainless steels in terms of corrosion resistance.
【０００３】これらのステンレス鋼に対し、耐食性の犠
牲をできるだけ小さくして、強度を向上させた材料が望
まれ、その結果、時効硬化を利用して強度を向上させた
析出硬化型ステンレス鋼が開発されている。その一例で
あるマルテンサイト系析出硬化型ステンレス鋼は、優れ
た強度と耐食性を有しており、引張強度は１４０Kg/mm2
以上で、耐食性も１８−８ステンレス鋼と同等のものが
開発されている。そして、このマルテンサイト系析出硬
化型ステンレス鋼は、上記特性を生かして、特に耐食性
が必要で、なおかつ強度が必要な部材の材料として有効
に利用されている。[0003] For these stainless steels, a material in which the sacrifice of corrosion resistance is made as small as possible and the strength is improved is desired, and as a result, a precipitation hardening type stainless steel in which the strength is improved by utilizing age hardening is developed. Has been done. Martensitic precipitation hardening stainless steel, which is one example, has excellent strength and corrosion resistance, and has a tensile strength of 140 kg / mm 2
As described above, the same corrosion resistance as 18-8 stainless steel has been developed. Further, this martensitic precipitation hardening stainless steel is effectively used as a material of a member that requires particularly corrosion resistance and strength, by utilizing the above characteristics.
【０００４】[0004]
【発明が解決しようとする課題】上記したように、析出
硬化型マルテンサイト系ステンレス鋼は、強度の点で他
の高強度鋼と比べても遜色のない十分に満足できる特性
を有しているが、シャルピー衝撃値で代表される靱性値
においては、他の高強度鋼に比べて、その値はかなり低
く、強靱性の点で高強度鋼よりも劣っている。 このた
め、上記ステンレス鋼は、使用条件の厳しい構造用鋼へ
の採用や大きな衝撃的外力を受ける用途への利用は困難
である。この発明は、上記課題を解決することを基本的
な目的とし、析出硬化型ステンレス鋼として本来有する
耐食性および強度を損なうことなく、靱性を向上させ
て、使用分野の拡大を可能とした析出硬化型ステンレス
鋼を提供するものである。As described above, the precipitation hardening type martensitic stainless steel has sufficient and satisfactory properties in terms of strength as compared with other high strength steels. However, the toughness value represented by the Charpy impact value is considerably lower than other high strength steels, and is inferior to the high strength steels in terms of toughness. For this reason, it is difficult to use the above-mentioned stainless steel for structural steel under severe operating conditions and for applications that receive a large impact external force. The present invention has a basic object to solve the above-mentioned problems, and improves the toughness without impairing the corrosion resistance and strength originally possessed as precipitation hardening stainless steel, and enables the expansion of the field of use of precipitation hardening type. It provides stainless steel.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するた
め、本願発明の析出硬化型ステンレス鋼は、重量％で、
Ｃr：１２．５〜１３．５％、Ｎi：８〜９％、Ｍo：
２．０〜２．５％、Ａl：０．７０〜０．９０％未満を
含有し、残部がＦe および不可避的不純物からなり、該
不可避的不純物のうち、Ｎの許容含有量を０．００２％
以下に制限したことを特徴とするものである。なお、上
記ステンレス鋼に含有されるＮ以外の不可避的不純物と
しては、Ｃ：０．０５％以下、Ｓi ：０．１％以下、Ｍ
n ：０．１％以下、Ｐ：０．０１％以下、Ｓ：０．０１
％以下を例示することができる。但し、不可避的不純物
としては、上記範囲および元素に限定されるものではな
く、要は不可避的に含有される不純物を総称するもので
ある。In order to solve the above-mentioned problems, the precipitation hardening stainless steel of the present invention is
Cr: 12.5 to 13.5%, Ni: 8 to 9%, Mo:
2.0 to 2.5%, Al: 0.70 to less than 0.90%, and the balance Fe and unavoidable impurities. Of these unavoidable impurities, the permissible content of N is 0.002. %
It is characterized by being limited to the following. The unavoidable impurities other than N contained in the stainless steel are C: 0.05% or less, Si: 0.1% or less, M
n: 0.1% or less, P: 0.01% or less, S: 0.01
% Or less can be exemplified. However, the unavoidable impurities are not limited to the above range and elements, but the essential point is to collectively refer to the impurities that are inevitably contained.
【０００６】[0006]
【作用】本願発明のステンレス鋼によれば、耐食性およ
び強度を低下させることなく、靱性を向上させることが
できる。したがって、耐食性、強度、靱性のいずれにも
おいても優れた材料が得られる。以下に、本願発明の成
分組成の範囲限定理由を述べる。According to the stainless steel of the present invention, the toughness can be improved without lowering the corrosion resistance and the strength. Therefore, a material having excellent corrosion resistance, strength, and toughness can be obtained. The reasons for limiting the range of the component composition of the present invention will be described below.
【０００７】Ｃr：１２．５〜１３．５％ Ｃr は耐食性を向上させるために含有させる。ただし、
１２．５％未満では、十分な耐食性を得ることができ
ず、また、１３．５％を超えて含有させると、δ−フェ
ライトの生成が増加する。このδ−フェライトは、材料
の脆化の一原因になると考えられており、その生成の増
加は、結果として材料の靱性を低下させるので１３．５
％を上限とする。Ｎi：８〜９％ Ｎi は、耐食性向上を補佐し、さらに靱性を向上させる
ために、８％以上含有させる。また、その含有量は、マ
ルテンサイト変態点の低下と、残留オーステナイトの生
成を抑えるために、９％以下とする。なお、同様の理由
で８．４０〜８．７０％の範囲が、望ましく、さらに
８．５０％を超えて８．７０％以下とするのが一層望ま
しい。 Cr: 12.5-13.5% Cr is contained in order to improve the corrosion resistance. However,
If it is less than 12.5%, sufficient corrosion resistance cannot be obtained, and if it exceeds 13.5%, the formation of δ-ferrite increases. This δ-ferrite is believed to contribute to the embrittlement of the material, and its increased production results in a decrease in the toughness of the material.
% Is the upper limit. Ni: 8-9% Ni is contained in an amount of 8% or more in order to assist in improving the corrosion resistance and further improve the toughness. Further, the content thereof is set to 9% or less in order to suppress the decrease of the martensite transformation point and the formation of retained austenite. For the same reason, the range of 8.40 to 8.70% is desirable, and more preferably more than 8.50% and 8.70% or less.
【０００８】Ｍo：２．０〜２．５％ Ｍo は、引張強度を向上させるために含有させる。ただ
し、２．０％未満の含有では、その効果は不十分であ
り、また２．５％を超えて含有させると、フェライト生
成を促して材料が脆化するので上記範囲とする。Ａl：０．７０〜０．９０％未満 Ａl は、Ｎi と結合して、金属間化合物を形成し、十分
な強度を確保するためには、０．７０％以上含有させる
必要がある。ただし、０．９０％以上含有させると、必
要以上にＡlＮ等の非金属介在物が生成されて靱性が低
下するので上記範囲とする。なお、同様の理由で、０．
７５〜０．９０％未満の範囲がさらに望ましい。Ｎ：０．００２％以下 Ｎは靱性を低下させるＡlＮの生成をなるべく抑制する
ために不可避不純物として、その許容含有量を０．００
２％以下に制限した。 Mo: 2.0 to 2.5% Mo is contained in order to improve the tensile strength. However, if the content is less than 2.0%, the effect is insufficient, and if the content exceeds 2.5%, ferrite formation is promoted and the material becomes brittle, so the content is in the above range. Al: 0.70 to less than 0.90% Al must be contained in an amount of 0.70% or more in order to bond with Ni to form an intermetallic compound and to secure sufficient strength. However, if it is contained in an amount of 0.90% or more, non-metallic inclusions such as AlN are generated more than necessary and the toughness is lowered, so the above range is set. For the same reason, 0.
The range of 75 to less than 0.90% is more desirable. N: 0.002% or less N is an unavoidable impurity in order to suppress the formation of AlN that deteriorates toughness as much as possible, and its allowable content is 0.00.
It was limited to 2% or less.
【０００９】[0009]
【実施例】以下に、この発明の実施例を、本発明の範囲
外である比較例と比較しつつ、説明する。なお、比較例
の材料は、ＡＳＴＭ規格Ａ６９３−ＸＭ１３番に準じた
成分を有する析出型ステンレス鋼である。表１に示すよ
うに、本発明鋼（供試材Ｎo.１〜４）と、比較鋼（供試
材Ｎo.５，６）とを、真空溶解炉でそれぞれ溶解し、５
０Ｋｇの鋼塊（径１５０mm）を溶製した。得られた鋼塊
を、幅１３０ｍｍ、厚さ３０ｍｍの断面を有する平板に
鍛造した後、溶体化、焼入れ、時効処理からなる熱処理
を施して供試材とした。EXAMPLES Examples of the present invention will be described below in comparison with comparative examples which are outside the scope of the present invention. The material of the comparative example is a precipitation-type stainless steel having a component according to ASTM standard A693-XM13. As shown in Table 1, the steels of the present invention (specimen Nos. 1 to 4) and the comparative steels (specimen Nos. 5 and 6) were melted in a vacuum melting furnace, respectively.
A 0 Kg steel ingot (diameter 150 mm) was melted. The obtained steel ingot was forged into a flat plate having a cross section with a width of 130 mm and a thickness of 30 mm, and then subjected to heat treatment including solution treatment, quenching, and aging treatment to obtain a test material.
【００１０】上記熱処理後の供試材に対し、機械的性質
を調査するために、引張試験およびシャルピー衝撃試験
を行った。なお、シャルピー吸収エネルギは、室温（２
０℃）で測定した。得られた結果は、表２に示すとおり
である。表２から明らかなように、本発明鋼はいずれ
も、比較鋼と同等、もしくはそれ以上の強度を有し、し
かも室温における切欠き靱性は比較鋼よりはるかに優れ
ている（約２倍）。Tensile tests and Charpy impact tests were conducted on the test materials after the heat treatment in order to investigate the mechanical properties. The Charpy absorbed energy is equal to room temperature (2
It was measured at 0 ° C. The obtained results are as shown in Table 2. As is clear from Table 2, each of the steels of the present invention has a strength equal to or higher than that of the comparative steel, and the notch toughness at room temperature is far superior to that of the comparative steel (about twice).
【００１１】[0011]
【表１】 [Table 1]
【００１２】[0012]
【表２】 [Table 2]
【００１３】[0013]
【発明の効果】以上説明したように、本願発明の析出硬
化型ステンレス鋼によれば、析出硬化型ステンレス鋼と
して従来、得られていた強度、耐食性を損なうことな
く、靱性を向上させることができる。その結果、耐食
性、強度に加え、強靱性が要求される材料への使用が可
能となり、使用分野が拡大して、利用の活発化を図るこ
とができる効果がある。As described above, according to the precipitation hardening stainless steel of the present invention, it is possible to improve the toughness without impairing the strength and corrosion resistance which have been conventionally obtained as the precipitation hardening stainless steel. .. As a result, it is possible to use it for a material that requires toughness in addition to corrosion resistance and strength, which has the effect of expanding the field of use and encouraging its use.
Claims (1)
％、Ｎi ：８〜９％、Ｍo ：２．０〜２．５％、Ａl ：
０．７０〜０．９０％未満を含有し、残部がＦe および
不可避的不純物からなり、該不可避的不純物のうち、Ｎ
の許容含有量を０．００２％以下に制限したことを特徴
とする析出硬化型ステンレス鋼1. Cr, by weight%: 12.5-13.5.
%, Ni: 8-9%, Mo: 2.0-2.5%, Al:
The content is 0.70 to less than 0.90%, and the balance is Fe and inevitable impurities.
Of precipitation hardening stainless steel characterized by limiting the allowable content of Fe to 0.002% or less
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31145291A JPH05125490A (en) | 1991-10-31 | 1991-10-31 | Deposition hardening type stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31145291A JPH05125490A (en) | 1991-10-31 | 1991-10-31 | Deposition hardening type stainless steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05125490A true JPH05125490A (en) | 1993-05-21 |
Family
ID=18017393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31145291A Pending JPH05125490A (en) | 1991-10-31 | 1991-10-31 | Deposition hardening type stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05125490A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012002208A1 (en) * | 2010-06-28 | 2012-01-05 | 社団法人日本航空宇宙工業会 | Precipitation-hardened stainless steel and process for production thereof |
| JP2013241670A (en) * | 2012-04-27 | 2013-12-05 | Daido Steel Co Ltd | Steel for steam turbine blade with excellent strength and toughness |
| US9982545B2 (en) | 2004-12-08 | 2018-05-29 | Mitsubishi Hitachi Power Systems, Ltd. | Precipitation hardened martensitic stainless steel, manufacturing method therefor, and turbine moving blade and steam turbine using the same |
-
1991
- 1991-10-31 JP JP31145291A patent/JPH05125490A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9982545B2 (en) | 2004-12-08 | 2018-05-29 | Mitsubishi Hitachi Power Systems, Ltd. | Precipitation hardened martensitic stainless steel, manufacturing method therefor, and turbine moving blade and steam turbine using the same |
| WO2012002208A1 (en) * | 2010-06-28 | 2012-01-05 | 社団法人日本航空宇宙工業会 | Precipitation-hardened stainless steel and process for production thereof |
| JP4918632B2 (en) * | 2010-06-28 | 2012-04-18 | 社団法人日本航空宇宙工業会 | Precipitation strengthened stainless steel and method for producing the same |
| JP2013241670A (en) * | 2012-04-27 | 2013-12-05 | Daido Steel Co Ltd | Steel for steam turbine blade with excellent strength and toughness |
| US9416436B2 (en) | 2012-04-27 | 2016-08-16 | Daido Steel Co., Ltd. | Steel for steam turbine blade with excellent strength and toughness |
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