JP2000063982A - Free cutting steel excellent in rust resistance and atmosphere corrosion resistance - Google Patents
Free cutting steel excellent in rust resistance and atmosphere corrosion resistanceInfo
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- JP2000063982A JP2000063982A JP10228092A JP22809298A JP2000063982A JP 2000063982 A JP2000063982 A JP 2000063982A JP 10228092 A JP10228092 A JP 10228092A JP 22809298 A JP22809298 A JP 22809298A JP 2000063982 A JP2000063982 A JP 2000063982A
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- steel
- rust
- less
- weather resistance
- machinability
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、各種ＯＡ機器、事
務機器、電子機器、ＦＡ機器等々の部品素材として利用
される、耐銹・耐候性を有する快削鋼に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to free-cutting steel having rust and weather resistance, which is used as a component material for various office automation equipment, office equipment, electronic equipment, FA equipment and the like.
【０００２】[0002]
【従来の技術】従来、コピー機シャフト材などのＯＡ機
器に使用される素材としては、室内環境で発銹がなく、
かつ所定形状に切削加工する際に充分な被削性を得るた
め、下記の２ケースがあった。
１）高価なＳＵＳ３０３、４１６、４３０Ｆ等のステン
レス快削鋼を使用する。
２）ＳＵＭ２３、２４等の快削鋼を切削加工後に鍍金処
理を施し使用する。2. Description of the Related Art Conventionally, materials used for office automation equipment such as shaft materials for copying machines have no rust in an indoor environment,
In addition, there were the following two cases in order to obtain sufficient machinability when cutting into a predetermined shape. 1) Use expensive free-cutting stainless steel such as SUS303, 416, 430F. 2) Use free-cutting steel such as SUM23, 24 after cutting and plating.
【０００３】ＳＵＳ３０３、４１６、４３０Ｆ等のステ
ンレス快削鋼を使用した場合、室内環境程度の使用条件
では必要以上に優れた耐銹・耐候性を有するため、材料
のコストが割高となる。またＳＵＭ２３、２４等の快削
鋼を使用した場合、切削加工後の鍍金処理工程におい
て、工程数の増加に伴うコストアップや納期問題が生じ
ること、鍍金層厚のばらつきによる耐銹・耐候性の劣
化、環境問題の引き金となる鍍金廃液の処理等の問題点
がある。When stainless free cutting steel such as SUS303, 416, 430F is used, it has more excellent rust and weather resistance than is necessary under operating conditions such as indoor environment, so the cost of the material is high. Also, when using free-cutting steel such as SUM23, 24, in the plating process after cutting, cost increase and delivery problem occur due to the increase in the number of processes, and rust and weather resistance due to variations in plating layer thickness There are problems such as the treatment of plating waste liquid that causes deterioration and environmental problems.
【０００４】また、一般にＳはＭｎと化合物を形成し被
削性を向上させる作用があるが、ＭｎＳは空気中の成分
と反応して微量のＨ2Ｓガス（アウトガス）を発生し、
ＯＡ機器等の機能を損ねることがある。In general, S forms a compound with Mn to improve machinability, but MnS reacts with components in the air to generate a trace amount of H 2 S gas (outgas),
It may impair the function of OA equipment.
【０００５】[0005]
【発明が解決しようとする課題】本発明の目的は、Ｈ2
Ｓガスの発生を抑制し、鍍金処理を施さなくても室内環
境での使用に十分適した耐銹・耐候性を有し、必ずしも
切削加工前に焼なまし処理を必要とすることなく良好な
被削性を有する鋼を提供することである。The object of the present invention is to provide H 2
It suppresses the generation of S gas and has rust and weather resistance that is well suited for use in an indoor environment without plating, and does not necessarily require an annealing treatment before cutting. It is to provide steel having machinability.
【０００６】[0006]
【課題を解決するための手段】上記の課題を解決するた
めに種々の実験を重ねた結果、Ｃｒが重量％で５〜１１
％含まれるレベルの鋼材においては、Ｍｎ／Ｓ≦１．５
とし、ＣｒとＳの化合物を形成させることにより、耐銹
・耐候性および耐アウトガス特性が向上するとともに、
良好な被削性が得られることを見いだした。As a result of various experiments conducted in order to solve the above problems, Cr is 5 to 11% by weight.
%, Mn / S ≦ 1.5
By forming a compound of Cr and S, rust and weather resistance and outgas resistance are improved, and
It has been found that good machinability can be obtained.
【０００７】上記目的を達成するため、本発明の手段
は、請求項１の発明では、成分組成をＣ：０．００１〜
０．０５０％、Ｓｉ：０．１〜３．０％、Ｍｎ：０．０
１〜０．５％、Ｃｒ：５．０〜１１．０％、Ｎｉ：１．
０％以下、Ｃｕ：１．０％以下、Ｍｏ：１．０％以下、
Ａｌ：０．０１％ 未満、Ｓ：０．１〜０．５％、かつ
Ｍｎ／Ｓ≦１．５、を含有し、残部実質的にＦｅからな
ることを特徴とした耐銹・耐候性に優れた快削鋼であ
る。In order to achieve the above-mentioned object, the means of the present invention is, in the invention of claim 1, the component composition of C: 0.001 to
0.050%, Si: 0.1-3.0%, Mn: 0.0
1 to 0.5%, Cr: 5.0 to 11.0%, Ni: 1.
0% or less, Cu: 1.0% or less, Mo: 1.0% or less,
Al: less than 0.01%, S: 0.1 to 0.5%, and Mn / S ≤ 1.5, with the balance being essentially Fe, for rust and weather resistance. It is an excellent free-cutting steel.
【０００８】請求項２の発明では、特に被削性が必要な
場合、前記請求項１の手段の化学成分に、さらにＳｅ：
０．０５〜０．３０％、Ｐｂ：０．０５〜０．２５％の
うち１種または２種を含む鋼である。In the invention of claim 2, particularly when machinability is required, in addition to the chemical composition of the means of claim 1, Se:
It is a steel containing one or two of 0.05 to 0.30% and Pb: 0.05 to 0.25%.
【０００９】本発明に係わる成分範囲の限定理由につい
て、各成分毎に説明する。
Ｃ：０．００１〜０．０５０％
Ｃ量を増加すると固溶強化が促進されるとともにオース
テナイト相が増大し、冷却の際マルテンサイト相が生成
しやすくなり、硬さが高くなる。また、過度の添加は耐
銹・耐候性の劣化にも繋がる。このため、Ｃ量の上限を
０．０５０％とした。しかしながら、Ｃ量の極端な低下
させると製造時のコストアップにも繋がるとともに溶鋼
が過酸化状態となり鋼材を脆くするため、下限を０．０
０１％とした。The reason for limiting the range of components according to the present invention will be described for each component. C: 0.001 to 0.050% When the amount of C is increased, solid solution strengthening is promoted, the austenite phase is increased, and a martensite phase is easily generated during cooling, resulting in high hardness. Moreover, excessive addition also leads to deterioration of rust resistance and weather resistance. Therefore, the upper limit of the amount of C is set to 0.050%. However, if the amount of C is extremely reduced, it also leads to an increase in manufacturing cost and the molten steel becomes in a peroxidized state to make the steel material brittle, so the lower limit is 0.0
It was set to 01%.
【００１０】Ｓｉ：０．１〜３．０％
Ｓｉの添加は溶鋼の過酸化を防止するとともに、フェラ
イト相を増大させ、硬さを低下させる効果がある。その
ため、下限を０．１％とした。また、熱間圧延後の硬さ
を低下させるために、フェライト生成元素であるＳｉの
添加は有効であるが、過剰な添加はフェライト相の硬さ
を上昇させ、逆に被削性を低下させる。よって最大３．
０％とした。Si: 0.1 to 3.0% Addition of Si has the effects of preventing the peroxidation of molten steel, increasing the ferrite phase, and decreasing the hardness. Therefore, the lower limit is set to 0.1%. Further, in order to reduce the hardness after hot rolling, the addition of Si, which is a ferrite-forming element, is effective, but excessive addition increases the hardness of the ferrite phase and, conversely, reduces machinability. . Therefore, the maximum is 3.
It was set to 0%.
【００１１】Ｍｎ：０．０１〜０．５％
Ｍｎ／Ｓ≦１．５にコントロールすることにより、Ｓは
Ｃｒと化合物を形成しやすくなる傾向を示し、耐銹・耐
候性が向上するとともにＨ2Ｓガスの発生を抑制するこ
とができるため上限を０．５％とした。また、Ｍｎは溶
鋼の過酸化を防止するのに有効な元素であるため０．０
１％以上とした。Mn: 0.01 to 0.5% By controlling Mn / S≤1.5, S tends to form a compound with Cr, and S and rust resistance and weather resistance are improved. Since the generation of 2 S gas can be suppressed, the upper limit was made 0.5%. Further, Mn is an element effective in preventing the peroxidation of molten steel, so 0.0
It was set to 1% or more.
【００１２】Ｓ：０．１〜０．５％
Ｓの添加により、Ｃｒと化合物を形成し被削性を向上さ
せることができるが、多量の添加は熱間加工性の低下を
招くため、０．５％以下とした。また、Ｓの添加を抑制
すると被削性が低下するため、０．１％以上とした。S: 0.1 to 0.5% By adding S, a compound can be formed with Cr to improve the machinability, but addition of a large amount causes a reduction in hot workability, so 0 It was set to 0.5% or less. Further, if the addition of S is suppressed, the machinability decreases, so the content was made 0.1% or more.
【００１３】Ｎｉ：１．０％以下
Ｎi 添加量が増加すると、耐銹・耐候性が向上するが、
焼入れ硬化性が高くなるため１．０％以下とした。Ni: 1.0% or less When the amount of Ni added is increased, the rust and weather resistance are improved,
Since quench hardening becomes high, it was set to 1.0% or less.
【００１４】Ｃｒ：５．０〜１１．０％
Ｃｒは耐銹・耐候性を増加させる重要な元素であるとと
もに、Ｓと結合して硫化物を形成し被削性を向上させる
働きもあるため多い方が望ましいが、多量の含有はコス
トアップにも繋がるため、１１．０％以下とした。ま
た、Ｃｒ含有量が５．０％未満となると、室内環境での
使用に必要な耐銹・耐候性を確保するのが困難となるた
め、５．０％以上とした。Cr: 5.0 to 11.0% Cr is an important element that increases rust and weather resistance, and also acts to combine with S to form a sulfide to improve machinability. It is preferable that the amount is large, but the inclusion of a large amount leads to an increase in cost, so the content is made 11.0% or less. Further, if the Cr content is less than 5.0%, it becomes difficult to secure the rust resistance and weather resistance required for use in an indoor environment, so the content was made 5.0% or more.
【００１５】Ｍｏ：１．０％以下
Ｍｏは、耐銹・耐候性を向上させ、硬さを低下させる効
果があるため多い方が望ましいが、多量の添加は製造コ
ストの上昇に繋がるので、１．０％以下とした。Mo: 1.0% or less Mo is preferable because it has the effects of improving rust and weather resistance and reducing hardness, but addition of a large amount leads to an increase in manufacturing cost. It was set to 0.0% or less.
【００１６】Ｃｕ：１．０％以下
Ｃｕの添加は、耐銹・耐候性を向上させるが、過度の添
加は熱間加工性の劣化を引き起こすため、１．０％以下
とした。Cu: 1.0% or less Addition of Cu improves rust and weather resistance, but excessive addition causes deterioration of hot workability, so it is set to 1.0% or less.
【００１７】Ａｌ：０．０１％未満
脱酸材としてのＡｌを無添加とすることにより、鋼中の
酸素濃度が高くなると、硫化物の分散を被削性に対し良
好な状態にすることができるため、０．０１％未満とし
た。Al: less than 0.01% By not adding Al as a deoxidizing material, when the oxygen concentration in the steel becomes high, the dispersion of sulfide can be made in a good state with respect to machinability. Therefore, it is set to less than 0.01%.
【００１８】Ｓｅ：０．０５〜０．３０％、Ｐｂ：０．
０５〜０．２５％のうち１種又は２種
上記の添加元素は、被削性を向上させるのに有効な元素
である。従って、さらに被削性が必要な場合は材料の用
途に応じて適宜使用しても良いが、過剰な添加は耐候性
の劣化を引き起こすため、限定範囲をＳｅ：０．０５〜
０．３０％、Ｐｂ：０．０５〜０．２５％とした。Se: 0.05 to 0.30%, Pb: 0.
One or two of the above 05 to 0.25% is an additive element effective for improving machinability. Therefore, when further machinability is required, it may be appropriately used depending on the application of the material, but excessive addition causes deterioration of weather resistance, so the limit range is Se: 0.05 to
0.30% and Pb: 0.05-0.25%.
【００１９】[0019]
【発明の実施の形態】１００ｋｇ真空溶解炉にて鋼塊を
溶製し、請求項１の化学成分に相当する鋼として表１の
発明鋼１に示す鋼種を、請求項２の化学成分に相当する
鋼として表１の発明鋼４に示す鋼種を得た。また、熱間
鍛造により径２０ｍｍの素材を製造し、熱間鍛造後冷却
した素材と、焼なまし処理を行った素材から試験片を作
成し、硬さ、被削性および耐銹・耐候性の評価を行っ
た。BEST MODE FOR CARRYING OUT THE INVENTION A steel ingot is melted in a 100 kg vacuum melting furnace, and the steel type shown in invention steel 1 of Table 1 as a steel corresponding to the chemical composition of claim 1 corresponds to the chemical composition of claim 2. As the steel to be used, the steel grade shown in invention steel 4 of Table 1 was obtained. Also, a material with a diameter of 20 mm is manufactured by hot forging, and a test piece is prepared from the material that has been cooled after hot forging and the material that has been annealed, and the hardness, machinability and rust / weather resistance Was evaluated.
【００２０】[0020]
【実施例】次に、本発明鋼の実施例を説明する。表１に
示した成分組成の鋼種を、真空溶解炉にて１００ｋｇ鋼
塊を溶製し、熱間圧延により径２０ｍｍの素材を製造し
た。これら熱間圧延後冷却した素材と、焼なまし処理を
行った素材から試験片を作成し、硬さ、被削性および耐
銹・耐候性の評価を行った。EXAMPLES Next, examples of the steel of the present invention will be described. A steel ingot having a composition of components shown in Table 1 was melted in a vacuum melting furnace in a 100 kg steel ingot, and a material having a diameter of 20 mm was manufactured by hot rolling. A test piece was prepared from the material that was cooled after hot rolling and the material that was annealed, and the hardness, machinability, and rust / weather resistance were evaluated.
【００２１】[0021]
【表１】 [Table 1]
【００２２】被削性の評価は、表２に示す条件にて、ド
リルの先端が試験片表面から１０ｍｍ穿孔するのに要す
る時間（ｓ）で行い、快削ステンレス鋼の焼なまし状態
での被削性とほぼ同等以上である７ｓ以下を合格とし
た。結果を表４に示す。The machinability was evaluated under the conditions shown in Table 2 for the time (s) required for the tip of the drill to drill 10 mm from the surface of the test piece, and in the annealed state of the free-cutting stainless steel. 7s or less, which is almost equal to or more than machinability, was passed. The results are shown in Table 4.
【００２３】[0023]
【表２】 [Table 2]
【００２４】耐銹・耐候性の評価は、熱間圧延後冷却し
た状態の径１２ｍｍ×高さ２１ｍｍの試験片を用い、表
３に示すサイクル湿潤試験および湿潤試験にて行った。
ただし、サイクル湿潤試験の条件は、１０℃で１．５ｈ
保持と３０℃で３．５ｈ保持の繰り返しを２０回行っ
た。また、比較鋼４は厚さ６μｍの鍍金処理を施した鋼
種である。結果は、表４に示す。評価方法は、発銹無
し：Ａから、顕著な発銹：Ｅまでの５段階評価により行
い、Ｃ以上であれば室内環境の使用で合格とした。The evaluation of rust and weather resistance was carried out by a cycle wetting test and a wetting test shown in Table 3 using a test piece having a diameter of 12 mm and a height of 21 mm which was cooled after hot rolling.
However, the condition of the cycle wetting test is 1.5 hours at 10 ° C.
The holding and the 3.5 h holding at 30 ° C. were repeated 20 times. Comparative Steel 4 is a steel type having a thickness of 6 μm and subjected to plating treatment. The results are shown in Table 4. The evaluation method was a five-stage evaluation from no rusting: A to remarkable rusting: E, and if C or more, it was passed in the use of the indoor environment.
【００２５】[0025]
【表３】 [Table 3]
【００２６】[0026]
【表４】 [Table 4]
【００２７】上記表４に示した結果一覧から明らかなよ
うに、発明鋼１〜５の鋼種はいずれの状態でも、７ｓ以
下の優秀な被削性を示す。しかし、Ｃｒ量が少ないため
にフェライト量が少なくなり硬さが高くなっている比較
鋼１は被削性が劣る結果となっている。As is clear from the result list shown in Table 4, the steel types of invention steels 1 to 5 show excellent machinability of 7 s or less in any state. However, the comparative steel 1 in which the amount of ferrite is small and the hardness is high due to the small amount of Cr, results in poor machinability.
【００２８】耐銹・耐候性に関し、発明鋼１〜５の鋼種
は、製造コストの高い鍍金処理を施した比較鋼４と同等
以上の耐銹・耐候性を有しているが、Ｃｒ量の低い比較
鋼１及びＭｎ／Ｓ比の高い比較鋼３では耐銹・耐候性が
劣る結果となっている。Regarding the rust and weather resistance, the invention steels 1 to 5 have rust and weather resistance equal to or higher than that of the comparative steel 4 which has been plated at a high manufacturing cost. Comparative steel 1 having a low ratio and comparative steel 3 having a high Mn / S ratio have poor rust and weather resistance.
【００２９】従って、本発明鋼は酸素濃度をコントロー
ルによって優れた被削性を有し、かつＭｎ／Ｓをコント
ロールすることにより鍍金処理を行ったケースと同等以
上の耐銹・耐候性を有する鋼である。Therefore, the steel of the present invention has excellent machinability by controlling the oxygen concentration and has rust and weather resistance equivalent to or better than that of the case where plating treatment is performed by controlling Mn / S. Is.
【００３０】[0030]
【発明の効果】以上説明したように、本発明の快削鋼
は、上記成分組成とすることにより、必ずしも焼なまし
処理を施さなくても、焼なまし処理された従来の快削ス
テンレス鋼並みの被削性を有し、さらに製造コストの高
い鍍金処理を施したケースと同等以上の耐銹・耐候性を
有するため、低価格でハイパフォーマンスな耐銹・耐候
性に優れた快削鋼である。As described above, the free-cutting steel of the present invention has the above-mentioned composition of components, so that the conventional free-cutting stainless steel subjected to the annealing treatment does not necessarily have to be subjected to the annealing treatment. Since it has the same level of machinability and has rust and weather resistance equivalent to or better than that of the plated case with high manufacturing cost, it is a low-cost, high-performance free-cutting steel with excellent rust and weather resistance. is there.
Claims (2)
％、Ｓｉ：０．１〜３．０％、Ｍｎ：０．０１〜０．５
％、Ｃｒ：５．０〜１１．０％、Ｎｉ：１．０％以下、
Ｃｕ：１．０％以下、Ｍｏ：１．０％以下、Ａｌ：０．
０１％未満、Ｓ：０．１〜０．５％、かつＭｎ／Ｓ≦
１．５、残部実質的にＦｅおよび不可避不純物からなる
ことを特徴とする、耐銹・耐候性に優れた快削鋼。1. C: 0.001-0.050 by weight%.
%, Si: 0.1 to 3.0%, Mn: 0.01 to 0.5
%, Cr: 5.0 to 11.0%, Ni: 1.0% or less,
Cu: 1.0% or less, Mo: 1.0% or less, Al: 0.
Less than 01%, S: 0.1 to 0.5%, and Mn / S ≦
1.5, the balance is substantially free of Fe and unavoidable impurities, and is a free-cutting steel excellent in rust and weather resistance.
％、Ｓｉ：０．１〜３．０％、Ｍｎ：０．０１〜０．５
％、Ｃｒ：５．０〜１１．０％、Ｎｉ：１．０％以下、
Ｃｕ：１．０％以下、Ｍｏ：１．０％以下、Ａｌ：０．
０１％未満、Ｓ：０．１〜０．５％、かつＭｎ／Ｓ≦
１．５、さらにＳｅ：０．０５〜０．３０％、Ｐｂ：
０．０５〜０．２５％のうち１種または２種を含み、残
部実質的にＦｅおよび不可避不純物からなることを特徴
とする、耐銹・耐候性に優れた快削鋼。2. C: 0.001-0.050 by weight%.
%, Si: 0.1 to 3.0%, Mn: 0.01 to 0.5
%, Cr: 5.0 to 11.0%, Ni: 1.0% or less,
Cu: 1.0% or less, Mo: 1.0% or less, Al: 0.
Less than 01%, S: 0.1 to 0.5%, and Mn / S ≦
1.5, further Se: 0.05 to 0.30%, Pb:
A free-cutting steel excellent in rust and weather resistance, characterized in that it contains one or two of 0.05 to 0.25%, and the balance substantially consists of Fe and unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10228092A JP2000063982A (en) | 1998-08-12 | 1998-08-12 | Free cutting steel excellent in rust resistance and atmosphere corrosion resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10228092A JP2000063982A (en) | 1998-08-12 | 1998-08-12 | Free cutting steel excellent in rust resistance and atmosphere corrosion resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000063982A true JP2000063982A (en) | 2000-02-29 |
Family
ID=16871071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10228092A Pending JP2000063982A (en) | 1998-08-12 | 1998-08-12 | Free cutting steel excellent in rust resistance and atmosphere corrosion resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000063982A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1186678A1 (en) * | 2000-09-01 | 2002-03-13 | Daido Tokushuko Kabushiki Kaisha | Steel for shaft |
| KR20060049650A (en) * | 2004-06-29 | 2006-05-19 | 가부시키가이샤 고베 세이코쇼 | Steel for shipbuilding, excellent in corrosion-resistance |
-
1998
- 1998-08-12 JP JP10228092A patent/JP2000063982A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1186678A1 (en) * | 2000-09-01 | 2002-03-13 | Daido Tokushuko Kabushiki Kaisha | Steel for shaft |
| KR20060049650A (en) * | 2004-06-29 | 2006-05-19 | 가부시키가이샤 고베 세이코쇼 | Steel for shipbuilding, excellent in corrosion-resistance |
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