JPH0830253B2 - Precipitation hardening type martensitic stainless steel with excellent workability - Google Patents

Precipitation hardening type martensitic stainless steel with excellent workability

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Publication number
JPH0830253B2
JPH0830253B2 JP9769391A JP9769391A JPH0830253B2 JP H0830253 B2 JPH0830253 B2 JP H0830253B2 JP 9769391 A JP9769391 A JP 9769391A JP 9769391 A JP9769391 A JP 9769391A JP H0830253 B2 JPH0830253 B2 JP H0830253B2
Authority
JP
Japan
Prior art keywords
steel
stainless steel
less
martensitic stainless
precipitation hardening
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
Application number
JP9769391A
Other languages
Japanese (ja)
Other versions
JPH05112850A (en
Inventor
鉄也 島田
征三郎 阿部
和広 末次
雅之 天藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP9769391A priority Critical patent/JPH0830253B2/en
Publication of JPH05112850A publication Critical patent/JPH05112850A/en
Publication of JPH0830253B2 publication Critical patent/JPH0830253B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、熱間加工性、ガス切断
性や溶接性などの製造性および製品の伸びや絞り値など
の加工性に優れる析出硬化型マルテンサイト系ステンレ
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 type martensitic stainless steel excellent in hot workability, manufacturability such as gas cuttability and weldability, and workability such as elongation and reduction of product. is there.

【0002】[0002]

【従来の技術】17−4PHや15−5PHを代表とす
る析出硬化型マルテンサイト系ステンレス鋼は、固溶化
熱処理後の加工性や溶接性に優れているとともに、時効
処理を行うと高い降伏強度を有するマルテンサイト相を
生成することから、主として高強度構造用部材として用
いられている。しかし、本鋼種は高温におけるオーステ
ナイト状態から冷却すると、冷却速度によらずフェライ
ト相を析出することなくマルテンサイト相に変態するこ
とから、変態による割れ感受性が極めて高い。そのた
め、17−4PHステンレス鋼については、サイズが小
さいため比較的割れ感受性が低く、製造工程や使用用途
でガス切断や溶接をほとんど必要としない鋼棒のみJI
Sに規格化(SUS630)され、製造されている。製
品サイズの大きい厚板、特に板厚が30mmを越える厚手
材は、熱間圧延後の冷却による変態割れ(置き割れ)や
ガス切断による割れの感受性が高く、製品歩留りが極め
て低いため製造されていないのが現状である。
2. Description of the Related Art Precipitation hardening type martensitic stainless steels such as 17-4PH and 15-5PH are excellent in workability and weldability after solution heat treatment, and also have high yield strength when subjected to aging treatment. It is mainly used as a high-strength structural member because it produces a martensite phase having However, when this steel type is cooled from the austenite state at high temperature, it transforms into the martensite phase without precipitation of the ferrite phase regardless of the cooling rate, and therefore the susceptibility to cracking due to the transformation is extremely high. Therefore, regarding the 17-4PH stainless steel, since the size is small, the crack sensitivity is relatively low, and only the steel bar that requires almost no gas cutting or welding in the manufacturing process or the intended use is JI.
It is manufactured after being standardized to S (SUS630). Thick plates with large product sizes, especially thick plates with a plate thickness of more than 30 mm, are manufactured because they are highly susceptible to transformation cracking (placement cracking) due to cooling after hot rolling and cracking due to gas cutting, and the product yield is extremely low. The current situation is that there are none.

【0003】[0003]

【発明が解決しようとする課題】本発明は、上述したよ
うな現状の問題点を解決するものであって、当該鋼の成
分組成を改良することにより、熱間加工やガス切断にと
もなう割れ感受性を著しく低減して製造性を飛躍させ、
かつ製品サイズの大きい多分野へも安定して供給できる
加工性にすぐれた析出硬化型マルテンサイト系ステンレ
ス鋼を提供することを目的とする。
DISCLOSURE OF THE INVENTION The present invention is to solve the above-mentioned problems of the present situation. By improving the composition of the steel, the crack susceptibility associated with hot working and gas cutting is improved. To significantly reduce manufacturability,
Another object of the present invention is to provide a precipitation hardening type martensitic stainless steel having excellent workability, which can be stably supplied to various fields with a large product size.

【0004】[0004]

【課題を解決するための手段】本発明は上記目的を達成
するために、重量%としてC≦0.10%、Si≦1.
0%、Mn≦1.0%、Cr13.0〜20.0%、N
i3.0〜8.0%を含有し、Cu1.0〜5.0%ま
たはMo,Ti,Alの1種あるいは2種以上をそれぞ
れ≦1.0%含有せしめ、下記式で計算するδcal
(%)を≦10(%)とすること、および鋼中水素量を
≦2.0ppm とし、残部Feおよび不可避的不純物から
なる加工性にすぐれた析出硬化型マルテンサイト鋼を要
旨とする。 δcal =3(Cr+1.5Si+Mo)−2.8(Ni+0.5Mn+ 0.5Cu)−84(C+N)−19.8 以下本発明を詳細に説明する。本発明者らは、各分野の
用途に使用される析出硬化型マルテンサイト系ステンレ
ス鋼を製造することを目的に実験を試みた結果、製造性
に劣る原因が単にマルテンサイト相の生成にのみ起因す
るものではなく、成分組成にあること、すなわち、析出
硬化型マルテンサイト系ステンレス鋼の製造性は鋼中の
δフェライト量と鋼中水素量が相互に作用し、変態割れ
(置き割れ)感受性に大きく影響していることを見出し
た。
In order to achieve the above object, the present invention has a weight percentage of C ≦ 0.10% and Si ≦ 1.
0%, Mn ≦ 1.0%, Cr 13.0 to 20.0%, N
i3.0 to 8.0%, Cu 1.0 to 5.0%, or 1 or 2 or more of Mo, Ti, and Al respectively ≦ 1.0%, and calculated by the following formula δcal
(%) Is set to ≦ 10 (%), and the hydrogen content in the steel is set to ≦ 2.0 ppm, and the gist is a precipitation hardening type martensitic steel which is composed of the balance Fe and inevitable impurities and has excellent workability. δcal = 3 (Cr + 1.5Si + Mo) -2.8 (Ni + 0.5Mn + 0.5Cu) -84 (C + N) -19.8 The present invention will be described in detail below. The present inventors have conducted an experiment for the purpose of producing a precipitation hardening type martensitic stainless steel used for various fields of application, and as a result, the cause of poor manufacturability is simply due to the formation of a martensitic phase. However, the composition of the precipitation hardenable martensitic stainless steel depends on the δ ferrite content in the steel and the hydrogen content in the steel. I found that it had a great influence.

【0005】図1は、17−4PHステンレス鋼鋳片の
熱間加工割れ感受性に及ぼすδcalおよび鋼中水素量の
影響を示している。δcal が10%を越える鋼で生じた
熱間加工割れは深く、著しい歩留りの低下や割れ精整工
程の付加を招き、製造コストが著しく増大する。また、
加工度が大きい場合には、割れの程度が著しく製造が不
可能となる。
FIG. 1 shows the effects of δcal and the amount of hydrogen in the steel on the hot work crack susceptibility of 17-4PH stainless steel slab. The hot work cracks produced in steel having a δcal of more than 10% are deep, resulting in a significant decrease in yield and the addition of a crack adjusting process, resulting in a significant increase in manufacturing cost. Also,
When the workability is high, the degree of cracking is significant and manufacturing becomes impossible.

【0006】一方、鋼組成のδcal を10%以下にする
と、割れ感受性が著しく改善されることが明らかとなっ
た。しかし、マルテンサイト系析出硬化型ステンレス鋼
は、熱間圧延した後に徐冷してもフェライト相を析出す
ることなくマルテンサイト変態する。この変態により生
ずる残留応力によって、熱間圧延で生じた微小な割れが
進展し、深い割れとなることが明らかとなった。製品サ
イズが大きい厚板や大型の熱間鍛造品などの場合、この
変態による残留応力を抑制することは困難である。そこ
で、本発明者らは、マルテンサイト変態後の延性を改善
することによって、割れの進展を抑制することを指向
し、析出硬化型マルテンサイト系ステンレス鋼のマルテ
ンサイト相の延性支配因子について種々の実験室的検討
を実施した。その結果、図1に示すように、鋼中水素量
を2.0ppm 以下に低減することによって、熱間圧延後
のマルテンサイト変態に起因する割れの進展が抑制され
ることを見出した。
On the other hand, it became clear that the crack susceptibility was remarkably improved when the δcal of the steel composition was 10% or less. However, the martensitic precipitation hardening stainless steel undergoes martensitic transformation without precipitation of a ferrite phase even if it is gradually cooled after hot rolling. It has been clarified that the residual stress generated by this transformation causes a minute crack generated in the hot rolling to progress and become a deep crack. In the case of a thick plate with a large product size or a large hot forged product, it is difficult to suppress the residual stress due to this transformation. Therefore, the present inventors aimed to suppress the progress of cracking by improving the ductility after martensitic transformation, and various factors for controlling the ductility of the martensitic phase of precipitation hardening martensitic stainless steel. A laboratory study was conducted. As a result, as shown in FIG. 1, it was found that by reducing the hydrogen content in steel to 2.0 ppm or less, the development of cracks due to martensitic transformation after hot rolling was suppressed.

【0007】さらに、熱間圧延後の厚板の伸びに及ぼす
鋼中水素量の影響を図2に示す。図から明らかのように
鋼中の水素量が2.0ppm 以下になると延性が急激に向
上する。この結果、鋼中水素を2.0ppm 以下にする
と、ガス切断による割れ感受性が著しく低減し、従来ガ
ス切断後、切断面に発生していた深い割れが飛躍的に軽
減された。また、鋼中水素量を2.0ppm 以下とするこ
とによって、製品の固溶化熱処理後の伸び・絞りが向上
し加工性が向上した。
Further, FIG. 2 shows the influence of the hydrogen content in the steel on the elongation of the thick plate after hot rolling. As is clear from the figure, the ductility sharply improves when the hydrogen content in the steel becomes 2.0 ppm or less. As a result, when the hydrogen content in steel was 2.0 ppm or less, the cracking susceptibility due to gas cutting was significantly reduced, and the deep cracking that had occurred in the cut surface after the conventional gas cutting was dramatically reduced. Further, by setting the hydrogen content in the steel to 2.0 ppm or less, the elongation / drawing after the solution heat treatment of the product was improved and the workability was improved.

【0008】本発明はこのような結果に基づいて構成し
たものであり、以下に上記の通り成分を限定した理由を
説明する。Cはδフェライトの生成を抑制し熱間加工性
を改善する元素として有効に作用する。しかし、0.1
0重量%を越えると時効処理を施した後の衝撃靭性およ
び耐粒界腐蝕性が著しく低下するため、0.10重量%
を上限とした。Siは、強度の向上にも有効な元素であ
る。しかし、溶接性あるいは衝撃靭性の点から上限を
1.0重量%をとした。Mnは、加工性の向上にも有効
な元素である。しかし、1.0重量%を越えて添加する
と、オーステナイト相が安定化し時効処理後の残留オー
ステナイト量が増加するため、強度が低下する。したが
って、上限を1.0重量%とした。
The present invention is constructed based on such a result, and the reason why the components are limited as described above will be explained below. C effectively acts as an element that suppresses the formation of δ ferrite and improves hot workability. But 0.1
If it exceeds 0% by weight, impact toughness and intergranular corrosion resistance after aging treatment are significantly reduced, so 0.10% by weight
Was set as the upper limit. Si is an element effective in improving strength. However, from the viewpoint of weldability or impact toughness, the upper limit was made 1.0% by weight. Mn is an element effective in improving workability. However, if added in excess of 1.0% by weight, the austenite phase is stabilized and the amount of retained austenite after the aging treatment increases, so that the strength decreases. Therefore, the upper limit is set to 1.0% by weight.

【0009】Crは、ステンレス鋼として必要な耐食性
を得るに必要最小限度の13.0重量%を下限とした。
しかし、20.0重量%を越えるとσ相が生成しやすく
なり衝撃靭性が著しく低下するため、20.0重量%を
上限とした。Niは高温におけるオーステナイト相の生
成に必須の元素である。したがって、3.0重量%を下
限とした。しかし、8.0重量%を越えると、オーステ
ナスト相が安定になりMs点が室温以下となるため、固
溶化熱処理あるいは時効処理によって生成するマルテン
サイト量が著しく低下し、必要とされる強度が得られな
い。したがって、上限を8.0重量%とした。
The lower limit of Cr is 13.0% by weight, which is the minimum necessary for obtaining the corrosion resistance required for stainless steel.
However, if it exceeds 20.0% by weight, the σ phase is likely to be generated and the impact toughness is remarkably deteriorated. Ni is an essential element for forming an austenite phase at high temperature. Therefore, the lower limit is 3.0% by weight. However, if it exceeds 8.0% by weight, the austenast phase becomes stable and the Ms point becomes below room temperature, so that the amount of martensite produced by solution heat treatment or aging treatment is remarkably reduced, and the required strength is obtained. I can't. Therefore, the upper limit is set to 8.0% by weight.

【0010】Cuは、時効処理を施すことによってマル
テンサイト相中に微細に析出し、強度上昇に必要最小限
の1.0重量%を添加する場合の下限とした。しかし、
5.重量%越えると、高温における粒界脆化を促進し、
熱間加工性が阻害され高温割れに敏感になることから、
添加する場合の上限を5.0重量%とした。Al,T
i,Moは、選択的に添加するが、マルテンサイト相中
に化合物として微細に析出し、マルテンサイト相の強度
上昇に有効な元素である。しかし、添加する場合それぞ
れ1.0重量%を越えると、その効果が飽和するととも
にコストの上昇が著しくなることから、1.0重量%を
上限とした。
Cu is finely precipitated in the martensite phase by subjecting it to an aging treatment, and is the lower limit when 1.0% by weight, which is the minimum necessary for increasing the strength, is added. But,
5. If the content exceeds 10% by weight, it promotes grain boundary embrittlement at high temperature,
Since hot workability is impaired and hot cracking becomes sensitive,
The upper limit of the amount added is set to 5.0% by weight. Al, T
Although i and Mo are selectively added, they are elements that are finely precipitated as compounds in the martensite phase and are effective in increasing the strength of the martensite phase. However, in the case of adding more than 1.0% by weight, the effect is saturated and the cost increases remarkably, so the upper limit was 1.0% by weight.

【0011】δcal (%)=3(Cr+1.5Si+M
o)−2.8(Ni+0.5Mn+0.5Cu)−84
(C+N)−19.8は、鋳造後のδフェライト析出量
を計算する式として用いられ、この値が10%を越える
と熱間加工性が著しく損なわれ、熱間圧延中にδフェラ
イトを起点とした表面割れやエッジ割れを生ずることか
ら、10%を上限とした。
Δcal (%) = 3 (Cr + 1.5Si + M
o) -2.8 (Ni + 0.5Mn + 0.5Cu) -84
(C + N) -19.8 is used as a formula for calculating the amount of precipitation of δ ferrite after casting. If this value exceeds 10%, hot workability is significantly impaired, and δ ferrite is the starting point during hot rolling. Since the surface cracks and edge cracks described above occur, the upper limit was made 10%.

【0012】鋼中の水素量は、2.0ppm を越えるとマ
ルテンサイト相の延性が著しく低下し、熱間加工後の冷
却やガス切断の残留応力に起因した割れ感受性が著しく
増大することから、2.0ppm を上限とした。
If the amount of hydrogen in the steel exceeds 2.0 ppm, the ductility of the martensite phase is remarkably reduced, and the cracking susceptibility due to the residual stress of cooling or gas cutting after hot working is significantly increased. The upper limit was 2.0 ppm.

【0013】以上のような発明によって、従来困難と考
えられていた厚板や大型の熱間鍛造材など製品サイズが
大きい析出硬化型マルテンサイト系ステンレス鋼の製造
が可能となった。以下、本発明の実施例について説明す
る。
By the invention as described above, it becomes possible to manufacture a precipitation hardening type martensitic stainless steel having a large product size such as a thick plate and a large hot forged material which have been considered difficult in the past. Examples of the present invention will be described below.

【0014】[0014]

【実施例】表1に示す化学組成を有する鋼を溶製した
後、鋳造した鋼塊に1150℃で10時間の均熱拡散処
理を施した。この鋼塊を熱間圧延し、割れ発生の有無を
評価した。さらに、熱間圧延によって製造された厚板を
ガス切断し、割れ発生の有無を評価した。また、この厚
板に固溶化熱処理(1040℃×30min ,水冷)を施
した後、引張り試験片を採取し、破断伸びを調査した。
[Examples] After the steel having the chemical composition shown in Table 1 was melted, the cast steel ingot was subjected to soaking diffusion treatment at 1150 ° C for 10 hours. This steel ingot was hot-rolled and evaluated for the occurrence of cracks. Furthermore, the thick plate manufactured by hot rolling was gas-cut and evaluated for the occurrence of cracks. Further, after subjecting this thick plate to solution heat treatment (1040 ° C. × 30 min, water cooling), tensile test pieces were sampled and the breaking elongation was investigated.

【0015】その結果、表2に見られるように本発明鋼
であるNo.1〜5の試料は、熱間圧延やガス切断による
割れは、全く認められない。さらに、固溶化熱処理後の
破断伸びも15%前後の良好な値を示す。一方、比較材
として、δcal ≧10%以上のNo.6〜7の鋼は、鋼中
水素量が2.0ppm 以下にもかかわらず、熱間圧延によ
って深い割れが発生した。しかし、これらの鋼は、ガス
切断による割れは発生することなく、固溶化熱処理後も
優れた延性を示すことが明らかとなった。
As a result, as shown in Table 2, the steel of the present invention No. No cracks due to hot rolling or gas cutting are observed in the samples 1 to 5. Further, the elongation at break after the solution heat treatment also shows a good value of around 15%. On the other hand, as a comparative material, No. with δcal ≧ 10% or more. Steel Nos. 6 to 7 had deep cracks caused by hot rolling even though the hydrogen content in the steel was 2.0 ppm or less. However, it has been clarified that these steels show excellent ductility even after solution heat treatment without cracking due to gas cutting.

【0016】次に、δcal ≦10であるが鋼中水素量が
2.0ppmを越えるNo.8〜11の鋼は、熱間加工後や
ガス切断後の冷却過程で深い割れが多数発生した。ま
た、固溶化熱処理後の伸び・絞り値も%と低く加工性に
劣ることがわかる。
Next, in the case of δcal ≦ 10, the hydrogen content in steel exceeds 2.0 ppm. In the steels Nos. 8 to 11, many deep cracks occurred in the cooling process after hot working and gas cutting. Further, it can be seen that the elongation / drawing value after solution heat treatment is as low as% and the workability is poor.

【0017】[0017]

【表1】 [Table 1]

【0018】[0018]

【表2】 [Table 2]

【0019】以上の実施例から、本発明は、δフェライ
トの生成量に関与する成分組成および鋼中の水素量が、
熱間圧延後やガス切断後の割れ感受性およびマルテンサ
イト変態後の延性に密接に関連して、極めて効果的に作
用し、優れた加工性を有することが明らかである。
From the above examples, according to the present invention, the composition of components involved in the production amount of δ ferrite and the amount of hydrogen in steel are
It is clear that it has an extremely effective action and excellent workability in close relation to crack susceptibility after hot rolling and gas cutting and ductility after martensitic transformation.

【0020】[0020]

【発明の効果】以上のように、本発明によれば、熱間加
工やガス切断にともなう割れの感受性が著しく低減し製
造性が飛躍的に向上することから、析出硬化型マルテン
サイト系ステンレス鋼の製造歩留りが大幅に向上する。
特に、従来製造が極めて困難と考えられていた厚板や大
型の熱間鍛造品などのように製品サイズの大きい析出硬
化型マルテンサイト系ステンレス鋼製品の製造が可能と
なった。近年、高い降伏強度を有する大型のステンレス
鋼構造部材の要求が高まっているが、本発明により実用
に供することが可能となった。以上の点から、本発明に
よる産業上の寄与は極めて大きい。
As described above, according to the present invention, the susceptibility to cracking due to hot working or gas cutting is remarkably reduced and the manufacturability is dramatically improved. Therefore, precipitation hardening type martensitic stainless steel is used. The manufacturing yield of is greatly improved.
In particular, it has become possible to manufacture precipitation hardenable martensitic stainless steel products having a large product size such as thick plates and large hot forged products, which have been considered extremely difficult to manufacture in the past. In recent years, the demand for large-sized stainless steel structural members having high yield strength has increased, but the present invention has enabled practical use. From the above points, the industrial contribution of the present invention is extremely large.

【図面の簡単な説明】[Brief description of drawings]

【図1】17−4PHステンレス鋳片の熱間加工割れに
及ぼすδcal 及び鋼中水素量の影響を示す図。
FIG. 1 is a diagram showing the influence of δcal and the amount of hydrogen in steel on hot work cracking of a 17-4PH stainless slab.

【図2】熱延後の厚板の伸びに及ぼす鋼中水素量の影響
を示す図。
FIG. 2 is a diagram showing the effect of the amount of hydrogen in steel on the elongation of a thick plate after hot rolling.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 天藤 雅之 神奈川県相模原市淵野辺5−10−1 新日 本製鐵株式会社 第2技術研究所内 (56)参考文献 特開 昭60−36649(JP,A) 特開 平1−119649(JP,A) 特公 昭43−5987(JP,B1) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayuki Tento 5-10-1 Fuchinobe, Sagamihara-shi, Kanagawa, Nippon Steel Corporation Second Research Laboratory (56) Reference JP-A-60-36649 (JP , A) JP-A-1-119649 (JP, A) Japanese Patent Publication No. 43-5987 (JP, B1)

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 重量%で、 C:0.10%以下、 Si:1.0%以下、 Mn:1.0%以下、 Cr:13.0〜20.0%、 Ni:3.0〜8.0%以下、 Cu:1.0〜5.0% を含有し、かつ鋼中のδフェライト(計算値)δcal
(%)が 3(Cr+1.5Si+Mo)−2.8(Ni+0.5Mn+0.5Cu) −84(C+N)−19.8≦10(%) であり、更に、 鋼中水素量:2ppm 以下 であって、残部Feおよび不可避不純物からなる加工性
に優れた析出硬化型マルテンサイト系ステンレス鋼。
1. By weight%, C: 0.10% or less, Si: 1.0% or less, Mn: 1.0% or less, Cr: 13.0 to 20.0%, Ni: 3.0 to 8.0% or less, Cu: 1.0 to 5.0% contained, and δ ferrite in steel (calculated value) δcal
(%) Is 3 (Cr + 1.5Si + Mo) -2.8 (Ni + 0.5Mn + 0.5Cu) -84 (C + N) -19.8 ≦ 10 (%), and the hydrogen content in steel is 2 ppm or less. , Precipitation-hardening martensitic stainless steel with excellent workability, consisting of balance Fe and unavoidable impurities.
【請求項2】 重量%で、 C:0.10%以下、 Si:1.0%以下、 Mn:1.0%以下、 Cr:13.0〜20.0%、 Ni:3.0〜8.0% これに加えて、Mo,Ti,Alの1種あるいは2種以
上:1.0%以下を含有し、かつ鋼中のδフェライト
(計算値)δcal (%)が 3(Cr+1.5Si+Mo)−2.8(Ni+0.5Mn+0.5Cu) −84(C+N)−19.8≦10(%) であり、更に、 鋼中水素量:2ppm 以下 であって、残部Feおよび不可避不純物からなる加工性
に優れた析出硬化型マルテンサイト系ステンレス鋼。
2. By weight%, C: 0.10% or less, Si: 1.0% or less, Mn: 1.0% or less, Cr: 13.0 to 20.0%, Ni: 3.0 to 8.0% In addition to this, one or more of Mo, Ti, and Al: 1.0% or less is contained, and δ ferrite (calculated value) δcal (%) in steel is 3 (Cr + 1. 5Si + Mo) -2.8 (Ni + 0.5Mn + 0.5Cu) -84 (C + N) -19.8 ≦ 10 (%), and further, the hydrogen content in steel: 2 ppm or less, and the balance Fe and inevitable impurities. Precipitation hardening type martensitic stainless steel with excellent workability.
JP9769391A 1991-04-26 1991-04-26 Precipitation hardening type martensitic stainless steel with excellent workability Expired - Lifetime JPH0830253B2 (en)

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JP9769391A JPH0830253B2 (en) 1991-04-26 1991-04-26 Precipitation hardening type martensitic stainless steel with excellent workability

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Application Number Priority Date Filing Date Title
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JPH0830253B2 true JPH0830253B2 (en) 1996-03-27

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996003532A1 (en) * 1994-07-21 1996-02-08 Nippon Steel Corporation Martensitic stainless steel having excellent hot workability and sulfide stress cracking resistance
JPH08319546A (en) * 1995-05-23 1996-12-03 Aichi Steel Works Ltd Stainless steel for cold forging
JP3542239B2 (en) * 1996-10-15 2004-07-14 新日本製鐵株式会社 High-strength stainless wire with excellent resistance to longitudinal cracking and its wire
JP2000204447A (en) * 1999-01-08 2000-07-25 Hitachi Ltd High strength martensitic steel, turbine disk for gas turbine using the same, gas turbine for power generation and combined power generating system
JP2001303203A (en) * 2000-04-20 2001-10-31 Sumitomo Metal Ind Ltd High strength martensitic stainless steel and oil well pipe using the same
EP1514950B1 (en) * 2002-06-19 2011-09-28 JFE Steel Corporation Stainless-steel pipe for oil well and process for producing the same
JP5063024B2 (en) * 2006-04-03 2012-10-31 住友金属工業株式会社 Method of casting alloy steel containing Cr and Ni
JP2018178144A (en) * 2017-04-04 2018-11-15 山陽特殊製鋼株式会社 Precipitation-hardened stainless steel having excellent hot workability
JP6987651B2 (en) * 2018-01-23 2022-01-05 山陽特殊製鋼株式会社 High hardness precipitation hardening stainless steel with excellent hot workability and no sub-zero treatment required

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