JPS63169363A - Free cutting austenitic stainless steel - Google Patents
Free cutting austenitic stainless steelInfo
- Publication number
- JPS63169363A JPS63169363A JP31145486A JP31145486A JPS63169363A JP S63169363 A JPS63169363 A JP S63169363A JP 31145486 A JP31145486 A JP 31145486A JP 31145486 A JP31145486 A JP 31145486A JP S63169363 A JPS63169363 A JP S63169363A
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- hot workability
- steel
- less
- austenitic stainless
- 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
- 238000005520 cutting process Methods 0.000 title claims abstract description 20
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 12
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 3
- 229910052742 iron Inorganic materials 0.000 claims abstract 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 16
- 239000010935 stainless steel Substances 0.000 claims description 14
- 230000007797 corrosion Effects 0.000 abstract description 17
- 238000005260 corrosion Methods 0.000 abstract description 17
- 230000006866 deterioration Effects 0.000 abstract description 8
- 229910052804 chromium Inorganic materials 0.000 abstract description 4
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 231100000614 poison Toxicity 0.000 abstract 1
- 230000007096 poisonous effect Effects 0.000 abstract 1
- 229910001566 austenite Inorganic materials 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000011651 chromium Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 231100000252 nontoxic Toxicity 0.000 description 5
- 230000003000 nontoxic effect Effects 0.000 description 5
- 230000001771 impaired effect Effects 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明はオーステナイト系快削ステンレス鋼に間し、詳
しくは快削性元素としてｐｂに替えて毒性のないＢｉを
添加して特に食品機器用の素材として使用できる耐食性
、熱間加工性に優れたオー ′スデナイト系快削ステ
ンレス鋼に間する。[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to austenitic free-cutting stainless steel, and more specifically, to the production of austenitic free-cutting stainless steel, in particular, non-toxic Bi is added in place of PB as a free-cutting element, particularly for use in food equipment. This is an ausdenitic free-cutting stainless steel with excellent corrosion resistance and hot workability that can be used as a raw material.
［従来の技術］
オーステナイト系ステンレス鋼は耐食性、耐熱性、加工
性、機械的性質が優れているために広く使用されている
。しかし、普通鋼材に比べて難削性であり、特にオース
テナイト系ステンレス鋼は加工硬化性が強くさらに熱伝
導性が良くないので、高クロム系より被剛性が悪い、そ
のため、オーステナイト系ステンレス鋼にＰｂ、Ｓまた
はＳｅ等の快削性元素を添加し、被削性を改善したオー
ステナイト系快削ステンレス鋼が使用されている。しか
し、このうちｐｂを含有させたオーステナイト系快削ス
テンレス鋼は、使用中に衛生上有毒とされるｐｂが溶出
するという問題があり、食品機器用の素材としてｐｂを
含まないオーステナイト系快削ステンレス鋼の出現が盟
よれていた。[Prior Art] Austenitic stainless steel is widely used because of its excellent corrosion resistance, heat resistance, workability, and mechanical properties. However, it is more difficult to machine than ordinary steel, and austenitic stainless steel in particular has strong work hardening properties and poor thermal conductivity, making it less rigid than high-chromium steel. Austenitic free-cutting stainless steel is used, which has improved machinability by adding free-cutting elements such as , S, or Se. However, PB-containing austenitic free-cutting stainless steels have the problem of leaching PB, which is considered sanitary and toxic, during use. The appearance of steel was allied.
［発明が解決しようとする問窟点］
そこで、ｐｂと化学的に頭似した性質を有しｐｂのよう
に毒性のないＢｉｔ：Ｔ１１剛性改善元素として添加す
ることが考えられるが、Ｂｉはｐｂと同様にオーステナ
イト系ステンレス鋼の熱間加工性を著しく損なう元素で
ある。[Problems to be solved by the invention] Therefore, it is possible to add Bit:T11 as a stiffness improving element, which has chemically similar properties to PB and is not toxic like PB. Similarly, it is an element that significantly impairs the hot workability of austenitic stainless steel.
本発明は食品機器用の素材としてのｐｂ含有オーステナ
イト系快削ステンレス鋼の前記のごとき問題点に鑑みて
なされたもので、熱間加工性を劣化させずに被削性改付
元素としてＢｉを添加し、食品機器用素材に使用される
オーステナイト系快削ステンレス鋼を提供することを目
的とする。The present invention was made in view of the above-mentioned problems of PB-containing austenitic free-cutting stainless steel as a material for food equipment. The objective is to provide austenitic free-cutting stainless steel that is used as a material for food equipment.
［問題点を解決するための手段］
発明者等はＢｉ含有オーステナイト系ステンレス鋼の熱
間加工性を改善するため、Ｂ、Ｎ等の添加元素の影響に
つき鋭意研究を重ねた。その結果Ｂｉ含有オーステナイ
ト系ステンレス鋼に対して一定割合のＢの添加が熱間加
工性の劣化を防止すること、およびオーステナイトを安
定化させ熱間加工性を良くするＮの最遣含有景の範囲の
存在することを新たに知見して本発明を完成するの至っ
たものである。[Means for Solving the Problems] In order to improve the hot workability of Bi-containing austenitic stainless steel, the inventors have conducted intensive research on the effects of additive elements such as B and N. The results show that adding a certain proportion of B to Bi-containing austenitic stainless steel prevents the deterioration of hot workability, and the range of N content that stabilizes austenite and improves hot workability. The present invention was completed based on the new discovery of the existence of
本発明のオーステナイト系ステンレス鋼は、第１発明と
して、重量％で、Ｃ；０．１２％以下、Ｓｉ；１．５０
％以下、Ｍｎ；５．００％以下、Ｎ ｉ；６〜１５％、
Ｃｒ；１６〜２２％、Ｎ、０．１１〜０．２０％、Ｂｉ
Ｈｏ、０３〜０．３０％、Ｂ、０．００１０〜０．０１
５０％を含有し、Ｂ ／ Ｂ ｉ比を０．０１〜０．１
２とし、残部がＦｅおよび不純物元素からなることを要
旨とする。The austenitic stainless steel of the present invention has, as the first invention, C: 0.12% or less, Si: 1.50% by weight.
% or less, Mn; 5.00% or less, Ni; 6 to 15%,
Cr; 16-22%, N, 0.11-0.20%, Bi
Ho, 03-0.30%, B, 0.0010-0.01
50%, B/B i ratio 0.01-0.1
2, and the remainder consists of Fe and impurity elements.
さらに第２発明として、重量％で、Ｃ：０．１２％以下
、Ｓ ｉ；１．５０％以下、Ｍｎ；５．００％以下、Ｎ
ｉ；６〜１５％、Ｃｒ；１６〜２２％、Ｎ；０．１１〜
０．２０％、Ｂ ｉ；０．０３〜０．３０％、Ｂ；０．
００１０〜０．０１５０％を含有し、Ｂ ／ Ｂ ｉ比
を０．０１〜０．１２とし、さらにＳ、０．００１５％
以下、ＭＯ；４％以下およびＣｕ；４％以下のうち１種
または２種以上を含有し、残部がＦｅおよび不純物元素
からなることを要旨とする。Furthermore, as a second invention, in weight %, C: 0.12% or less, Si: 1.50% or less, Mn: 5.00% or less, N
i: 6-15%, Cr: 16-22%, N: 0.11-
0.20%, B i; 0.03-0.30%, B; 0.
0010~0.0150%, B/Bi ratio is 0.01~0.12, and S, 0.0015%
Hereinafter, the gist is that the material contains one or more of MO; 4% or less and Cu; 4% or less, and the remainder consists of Fe and impurity elements.
［作用］
本発明のオーステナイト系快削ステンレス鋼では、肢削
性改善元素としてｐｂに代わってＢｉを添加しているの
で、毒性がなく食品機器用として安心して使用できる。[Function] In the austenitic free-cutting stainless steel of the present invention, Bi is added instead of PB as an element for improving machinability, so it is non-toxic and can be safely used for food equipment.
また、Ｂｉの添加量に対して一定割合のＢとＮを添加し
、Ｂｉの添加による熱間加工性の劣化を防止している０
発明者等はＢ／Ｂｉの比と熱間加工性の１！！俤につい
て、研究を重ねた結果Ｂ ／ Ｂ ｉと高温絞り（％）
との間に第１図に示すような関係の有ることを見出だし
た。すなわち、第１図はＢ ／ Ｂ ｉを横軸にとり、
１１５０°Ｃにおける、％渦紋り（％）を縦軸にとって
その関係を示した図であるが、］’３ ／ Ｔ３ ｉが
０．０１〜０．１２の間で高温絞りが高い値を示すこと
が示されている。さらに、オーステナイト安定化元素で
あるＮを′ａ景添加することによって、オーステナイト
を安定化することによって熱間加工性を改善している。In addition, a certain proportion of B and N is added to the amount of Bi added to prevent deterioration of hot workability due to the addition of Bi.
The inventors determined that the B/Bi ratio and hot workability were 1! ! As a result of repeated research regarding the weight, B/B i and high temperature drawing (%)
We found that there is a relationship between the two as shown in Figure 1. That is, in Figure 1, B / B i is taken on the horizontal axis,
This is a diagram showing the relationship at 1150°C with % vortex (%) on the vertical axis; ]'3 / T3 i is between 0.01 and 0.12, and high temperature aperture shows a high value. It is shown. Furthermore, by adding N, which is an austenite stabilizing element, the austenite is stabilized and hot workability is improved.
次に本発明のオーステナイト系快削ステンレス鋼の各元
素の添加理由と組成範囲の限定理由について説明する。Next, the reason for adding each element to the austenitic free-cutting stainless steel of the present invention and the reason for limiting the composition range will be explained.
Ｃ，０，１２％以下
Ｃは強力なオーステナイト化元素であるが、耐食性およ
び被削性の面からは低いほうが良く、その上限を０．１
２％とした。C, 0.12% or less C is a strong austenitizing element, but from the viewpoint of corrosion resistance and machinability, the lower the lower the better, and the upper limit is set at 0.1%.
It was set at 2%.
Ｓｉ：１．５０％以下
Ｓｉは！！Ａ鋼時の脱酸剤として作用し、耐酸性および
耐酸化性を増す、しかし、多すぎると熱間加工性および
被剛性を阻害するので、上限を１．５０％とした。Si: 1.50% or less Si! ! It acts as a deoxidizing agent in A steel, increasing acid resistance and oxidation resistance. However, if too much, hot workability and stiffness are inhibited, so the upper limit was set at 1.50%.
Ｍｎ；５．００％以下
Ｍｎはオーステナイト化元素であり、Ｎｉよりも安価で
あるためＮｉの置換元素として添加される。Mn: 5.00% or less Mn is an austenitizing element and is added as a replacement element for Ni because it is cheaper than Ni.
しかし、多量に加えると熱間加工性を害し、かつ耐酸性
および耐酸化性を共に害するので、上限を５．００％と
した。However, if added in a large amount, it impairs hot workability and impairs both acid resistance and oxidation resistance, so the upper limit was set at 5.00%.
Ｎ ｉ；６〜１５％
Ｎ１はＣｒと共にオーステナイト系ステンレス鋼の基本
的な元素であり、オーステナイトを安定化し耐食性およ
び靭性を著しく改善する。Ｃｒと共存してオーステナイ
ト相を生成するためには少なくとも６％以上の添加が必
要である。しかし、あまり多く添加すると被剛性を阻害
し、かつ高価になるため上限を１５％とした。Ni: 6-15% N1 is a basic element of austenitic stainless steel along with Cr, stabilizes austenite, and significantly improves corrosion resistance and toughness. In order to coexist with Cr and form an austenite phase, it is necessary to add at least 6% or more. However, if too much is added, the rigidity will be impaired and the price will increase, so the upper limit was set at 15%.
Ｃｒ；１６〜２２％
Ｃｒはフェライト化元素であるがステンレス鋼の耐食性
およびＭ酸化性を向上するために添加する。オーステナ
イト系ステンレス鋼においては、Ｎｉと共に添加して耐
食性を確保するため、１６％以上が必要である。しかし
、多量に添加するとオーステナイト−フェライトのバラ
ンスを損ない、熱間加工性を害するので上限を２２％と
した。Cr; 16-22% Cr is a ferrite-forming element, and is added to improve the corrosion resistance and M oxidation property of stainless steel. In austenitic stainless steel, 16% or more of Ni is required to ensure corrosion resistance when added together with Ni. However, if added in a large amount, the austenite-ferrite balance will be impaired and hot workability will be impaired, so the upper limit was set at 22%.
Ｎ；０．１１〜０．２０％ Ｎはオーステナイトを安定化させる元素であり。N; 0.11-0.20% N is an element that stabilizes austenite.
このオーステナイト安定化により熱間加工性を改善する
元素である。Ｂｉ金含有よる熱間加工性の低下を防止す
るには少なくとも０，１１％の添加が必要である。なお
安定して向上させるためには０．１２％以上含有させる
とよい、しかし、あまり多く添加するとＢの熱間加工性
の改善を妨げるので、上限を０．２０％とした。This element improves hot workability by stabilizing austenite. In order to prevent deterioration in hot workability due to Bi gold content, it is necessary to add at least 0.11%. In order to stably improve the B content, it is recommended to contain it in an amount of 0.12% or more. However, if too much B is added, the improvement in the hot workability of B is hindered, so the upper limit is set to 0.20%.
Ｂ ｉＨｏ 、０３〜０．３０％
Ｂｉは毒性のない主要な被剛性改善元素の一つであり、
オーステナイト系ステンレス鋼に快削性を付与するため
には０．０３％以上添加することが必要である。しかし
、多量に添加すると熱間加工性を阻害するので、上限を
０．３０％とした。BiHo, 03-0.30% Bi is one of the main non-toxic elements to improve stiffness,
In order to impart free machinability to austenitic stainless steel, it is necessary to add 0.03% or more. However, if added in a large amount, hot workability will be inhibited, so the upper limit was set at 0.30%.
Ｂ、０．００１０〜０．０１５０％
ＢはＢｉ添加による熱間加工性の劣化を改善する元素で
ある。０．００１０％以下では熱間加工性の改善効果が
小さい、また、０．０１５０％を越えてもその効果の向
上が少なくなるので、上限および下限を前記のごとく定
めた。B, 0.0010 to 0.0150% B is an element that improves the deterioration of hot workability caused by the addition of Bi. If it is less than 0.0010%, the effect of improving hot workability is small, and if it exceeds 0.0150%, the effect is less improved, so the upper and lower limits were determined as described above.
Ｂ／Ｂｉ；０．０１〜０．１２
ＢはＢｉの添加による熱間加工性の劣化を防止する作用
を有する元素である。Ｂｉの添加に対して一定割合を添
加するが、その割合すなわちＢ／Ｂｉが０．０１以下で
あると熱間加工性の劣化の改善が十分でなく、その比を
０．０１以上とする必要がある。しかし、Ｂ ／ Ｂ
ｉの比が０．１２以上になると、その改善の効果が見ら
れなくなるので、上限を０．１２とした。B/Bi; 0.01 to 0.12 B is an element that has the effect of preventing deterioration of hot workability due to the addition of Bi. A certain proportion of Bi is added, but if the ratio, that is, B/Bi, is less than 0.01, the deterioration of hot workability will not be sufficiently improved, so the ratio needs to be 0.01 or more. There is. However, B/B
If the ratio of i exceeds 0.12, the improvement effect will no longer be seen, so the upper limit was set at 0.12.
Ｓ；０．００１５％
Ｓは鋼に快削性を付与する元素である。かつその含有を
極力低下させることにより′耐食性を改善することが可
能な元素であり、その上限を０．００１５％とした。S: 0.0015% S is an element that imparts free machinability to steel. It is an element whose corrosion resistance can be improved by reducing its content as much as possible, and its upper limit is set at 0.0015%.
Ｍｏ；４％以下
Ｍｏはオーステナイト系ステンレス鋼に添加されると耐
食性を著しく改善する。しかし、多量に添加すると熱間
加工性と被剛性を阻害するので、上限を４％とした。Mo: 4% or less When Mo is added to austenitic stainless steel, it significantly improves corrosion resistance. However, if added in a large amount, hot workability and stiffness will be impaired, so the upper limit was set at 4%.
Ｃｕ；４％以下
Ｃｕはステンレス鋼に添加されると耐酸化性を増し、被
剛性を改善する元素である。しかし、多量に添加される
と熱間加工性を阻害するので、上限を４％とした。Cu: 4% or less Cu is an element that increases oxidation resistance and improves stiffness when added to stainless steel. However, if added in large amounts, hot workability will be inhibited, so the upper limit was set at 4%.
［実施例］
次に本発明鋼の特徴を比較鋼と対比した実施例によって
明らかにする。[Example] Next, the characteristics of the steel of the present invention will be clarified by examples comparing it with comparative steel.
第１表はこれら供試賃の化学成分を示すものである。第
１表のＡｍ〜Ｅ鋼は第１発明鋼、ＦＷ４〜Ｊ＠は第２発
明鋼である。に鋼〜Ｎ＃ｌは比較鋼であって、ＫＩＲは
ＢおよびＢｉを含有しないもの、Ｌ鋼はＢを含有しない
もの、ＭＩＲはＢ ／ Ｂ ｉの高いもの、Ｎ鋼はＢｉ
およびＮが低く＜Ｂを含有しないものである。Table 1 shows the chemical composition of these samples. Am to E steels in Table 1 are the first invention steels, and FW4 to J@ are the second invention steels. Ni steel~N#l is a comparative steel, KIR is a steel that does not contain B and Bi, L steel is a steel that does not contain B, MIR is a steel that has a high B/Bi, and N steel is a steel that does not contain B.
and N is low and contains no B.
（以下余白）
これら供試鋼について被剛性、熱間加工性および耐食性
についての試験を行った。被剛性については、４０１Ｉ
ＩＩｌφ×１０餉ｍの素材を５個用意し、切肖り工具と
して５ｍ麟φの５ＫＨ９ストレート・ドリルを用いて、
回転数１１４０ｒｐｍ、推力３０ｋｇ（重錘自由落下法
）によってドリル穿孔時間を測定し、比較鋼であるに＃
Ｉを１００とした指数で示した。(Left below) These test steels were tested for rigidity, hot workability, and corrosion resistance. Regarding rigidity, 401I
Prepare 5 pieces of IIlφ x 10mm material and use a 5KH9 straight drill with 5mφ as a cutting tool.
The drilling time was measured at a rotation speed of 1140 rpm and a thrust of 30 kg (weight free fall method), and the comparison steel #
It is expressed as an index with I as 100.
熱間加工性については１１５０℃でグリ−プルによって
引張り試験を行いその絞り値を測定しな。Regarding hot workability, perform a tensile test using a Greeple at 1150°C and measure the reduction of area.
また、耐食性については、５％ＮａＣｌの３０℃水溶液
に１時間浸漬し、その発錆率を測定し、発錆率がＯのも
のを◎、発錆率が１〜３％のものをＯで示した。被削性
、熱間加工性および耐食性の試験結果については第２表
に合わせて示した。Regarding corrosion resistance, the rusting rate was measured by immersing it in a 5% NaCl aqueous solution at 30°C for 1 hour. Indicated. The test results for machinability, hot workability and corrosion resistance are also shown in Table 2.
（以下余白）
第 ２ 表
く注）○発錆率１〜３％
◎発誘率Ｏ％
第２表より明らかなように、比較鋼であるＫｍは被剛性
改善元素であるＢｉを含有しないので、被剛性が劣り、
Ｌ鋼はＢｉを含有しＢを含有しないので、被剛性におい
て優れているものの、熱間加工性が悪い、また、比較鋼
であるＭ鋼はＢ／Ｂｉが高いため熱間加工性に劣り、さ
らにＮ鋼はＢｉおよびＮが低くＢを添加しないので被削
性および熱間加工性共に悪い、比較鋼の耐食性について
はいずれも発錆率が１〜３％の範囲内であった。(Margins below) Table 2 Note) ○ Rust occurrence rate 1 to 3% ◎ Induction rate 0% As is clear from Table 2, Km, the comparative steel, does not contain Bi, which is an element to be improved in rigidity. , poor rigidity,
Since L steel contains Bi but not B, it has excellent stiffness but poor hot workability, and M steel, which is a comparative steel, has poor hot workability due to its high B/Bi ratio. Furthermore, N steel has low Bi and N content and no B is added, so it has poor machinability and hot workability. Regarding the corrosion resistance of the comparative steels, the rust rate was within the range of 1 to 3%.
これに比較して、本発明鋼であるＡ〜ＪｆＩ４は、Ｂｉ
と共にＢを添加しＢ ／ Ｂ ｉ値を規制し、さらにＮ
を適量含有させたので、被削性の指数は１３３〜１８３
を示し、熱間加工性は９０〜９２を示し、被削性および
熱間加工性において比較鋼よりも優れた値を示している
。また、耐食性についても、第１発明鋼はいずれも発錆
率が１〜３％であり、第２発明鋼については、Ｍｏおよ
びＣｕの添加によって発錆率は０％であって、優れた耐
食性を示した。In comparison, A to JfI4, which are steels of the present invention, have Bi
In addition, B is added to regulate the B/B i value, and further N
Since the appropriate amount of is contained, the machinability index is 133 to 183.
The hot workability was 90 to 92, showing values superior to the comparative steels in machinability and hot workability. Regarding corrosion resistance, all of the first invention steels have a rusting rate of 1 to 3%, and the second invention steel has a rusting rate of 0% due to the addition of Mo and Cu, and has excellent corrosion resistance. showed that.
［発明の効果］
本発明は以上説明したように、被剛性改善元素としてｐ
ｂに替えて毒性のないＢｉを添加したオーステナイト系
快削ステンレス鋼であって、Ｂｉの添加による熱間加工
性の劣化を一定割合のＢの添加によって改善するととも
に、Ｎ量についても熱間加工性の改善されるＭＷ範囲を
見出だしたものであって、耐食性、被剛性および熱間加
工性に優れたＢｉ添加オーステナイト系快削ステンレス
鋼を提供でき、毒性がないので食品機器用の素材として
安心して使用できるという優れた効果がある。[Effects of the Invention] As explained above, the present invention uses p as an element to be improved in stiffness.
This is an austenitic free-cutting stainless steel with non-toxic Bi added instead of B, and the deterioration of hot workability due to the addition of Bi is improved by adding a certain proportion of B, and the amount of N is also improved. We have found a MW range in which properties are improved, and can provide Bi-added austenitic free-cutting stainless steel with excellent corrosion resistance, stiffness, and hot workability.Since it is non-toxic, it can be used as a material for food equipment. It has excellent effects and can be used with peace of mind.
第１図は１１５０°Ｃにおける高温絞りとＢ／Ｂｉの関
係を示す図である。FIG. 1 is a diagram showing the relationship between high temperature drawing and B/Bi at 1150°C.
Claims (2)
％以下、Ｍｎ；５．００％以下、Ｎｉ；６〜１５％、Ｃ
ｒ；１６〜２２％、Ｎ；０．１１〜０．２０％、Ｂｉ；
０．０３〜０．３０％、Ｂ；０．００１０〜０．０１５
０％を含有し、Ｂ／Ｂｉ比を０．０１〜０．１２とし、
残部がＦｅおよび不純物元素からなることを特徴とする
オーステナイト系快削ステンレス鋼。(1) In weight%, C: 0.12% or less, Si: 1.50
% or less, Mn; 5.00% or less, Ni; 6 to 15%, C
r; 16-22%, N; 0.11-0.20%, Bi;
0.03-0.30%, B; 0.0010-0.015
0%, with a B/Bi ratio of 0.01 to 0.12,
An austenitic free-cutting stainless steel characterized in that the remainder consists of Fe and impurity elements.
％以下、Ｍｎ；５．００％以下、Ｎｉ；６〜１５％、Ｃ
ｒ；１６〜２２％、Ｎ；０．１１〜０．２０％、Ｂｉ；
０．０３〜０．３０％、Ｂ；０．００１０〜０．０１５
０％を含有し、Ｂ／Ｂｉ比を０．０１〜０．１２とし、
さらにＳ；０．００１５％以下、Ｍｏ；４％以下および
Ｃｕ；４％以下のうち１種または２種以上を含有し、残
部がＦｅおよび不純物元素からなることを特徴とするオ
ーステナイト系快削ステンレス鋼。(2) In weight%, C: 0.12% or less, Si: 1.50
% or less, Mn; 5.00% or less, Ni; 6 to 15%, C
r; 16-22%, N; 0.11-0.20%, Bi;
0.03-0.30%, B; 0.0010-0.015
0%, with a B/Bi ratio of 0.01 to 0.12,
The austenitic free-cutting stainless steel further contains one or more of S: 0.0015% or less, Mo: 4% or less, and Cu: 4% or less, with the remainder consisting of Fe and impurity elements. steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31145486A JPS63169363A (en) | 1986-12-30 | 1986-12-30 | Free cutting austenitic stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31145486A JPS63169363A (en) | 1986-12-30 | 1986-12-30 | Free cutting austenitic stainless steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63169363A true JPS63169363A (en) | 1988-07-13 |
Family
ID=18017411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31145486A Pending JPS63169363A (en) | 1986-12-30 | 1986-12-30 | Free cutting austenitic stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63169363A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3005019U (en) * | 1994-06-07 | 1994-12-06 | 株式会社イケダ | Instruments |
-
1986
- 1986-12-30 JP JP31145486A patent/JPS63169363A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3005019U (en) * | 1994-06-07 | 1994-12-06 | 株式会社イケダ | Instruments |
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