JP3100417B2 - Manufacturing method of stainless steel for coins - Google Patents
Manufacturing method of stainless steel for coinsInfo
- Publication number
- JP3100417B2 JP3100417B2 JP03083239A JP8323991A JP3100417B2 JP 3100417 B2 JP3100417 B2 JP 3100417B2 JP 03083239 A JP03083239 A JP 03083239A JP 8323991 A JP8323991 A JP 8323991A JP 3100417 B2 JP3100417 B2 JP 3100417B2
- Authority
- JP
- Japan
- Prior art keywords
- stainless steel
- hardness
- steel sheet
- coin
- coins
- 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.)
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- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Articles (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は，コイン用ステンレス鋼
の製造法に関する。The present invention relates to a method for producing stainless steel for coins.
【０００２】[0002]
【従来の技術】金属コインは，腐食変質しないことはも
とより，鮮明な刻印ができるに必要な良好なコイニング
性と，コイニング後にも疵が付きにくく耐摩耗性に優れ
ることが要求される。従来より，これらの性質を満足す
るコイン用材料として銅合金や銅合金にニッケルメッキ
等を施したものが使用されている。例えば最近増加して
いる遊戯用コインには，普通鋼，真鍮または純銅に汚れ
防止としてＮiメッキを施したメッキコインが多用され
ている。一部にはＣu-36Ｚn-9Ｎi系合金のように素地の
まま使用されている例もある。いずれにしてもコスト面
では高価となるという問題を有している。2. Description of the Related Art Metal coins are required not only to be not deteriorated by corrosion, but also to have good coining properties necessary for clear engraving and to have excellent abrasion resistance because they are hardly damaged even after coining. Conventionally, as a coin material satisfying these properties, a copper alloy or a copper alloy plated with nickel or the like has been used. For example, in recent years, the number of game coins, which have been increasing recently, often uses plated coins obtained by plating ordinary steel, brass or pure copper with Ni plating to prevent contamination. In some cases, such as Cu-36Zn-9Ni alloys are used as they are. In any case, there is a problem that the cost is expensive.
【０００３】一方，コイン材料としての前記要求特性や
コスト面からステンレス鋼も注目され，一部では使用さ
れている。本出願人も先に特願平2-177547号においてコ
イニング性および耐摩耗性に優れた非磁性コイン用ステ
ンレス鋼板を提案した。[0003] On the other hand, stainless steel has attracted attention because of the required characteristics and cost as a coin material, and some are used. The present applicant has also previously proposed in Japanese Patent Application No. 2-17747 a stainless steel sheet for non-magnetic coins having excellent coining properties and wear resistance.
【０００４】ステンレス鋼コインの場合には，その素材
鋼板の製造法としては, 所要回数の冷間圧延により目標
板厚に仕上げた後, 冷間圧延時に蓄積された歪みを解放
して軟質化するために冷延板に仕上げ焼鈍を施し, その
後に酸洗によるスケール除去を行い, 次に形状修正を行
ってコイン用鋼板製品とするのが通常である。すなわ
ち, 実作業に則した工程で言えば，鋼帯の熱間圧延→冷
延鋼帯の熱処理および酸洗→冷間圧延→仕上げ焼鈍およ
び酸洗→形状修正→コイン用製品素材鋼板, と言うこと
になる。なお，本明細書において鋼板および鋼帯を総称
して鋼板と呼ぶことがある。[0004] In the case of a stainless steel coin, as a method of manufacturing a material steel plate, after a required number of times of cold rolling is finished to a target thickness, the strain accumulated during cold rolling is released to soften. For this purpose, the cold-rolled sheet is usually subjected to finish annealing, followed by scale removal by pickling, and then to shape modification to obtain a steel sheet product for coins. In other words, in the process according to the actual work, it can be said that hot rolling of steel strip → heat treatment and pickling of cold rolled steel strip → cold rolling → finish annealing and pickling → shape modification → steel sheet for coin product material Will be. In this specification, a steel sheet and a steel strip may be collectively referred to as a steel sheet.
【０００５】[0005]
【発明が解決しようとする課題】前述のコイン用ステン
レス鋼板の製造工程での冷延後の仕上げ焼鈍は，コイニ
ング性 (特に軟質化) を確保するうえで不可欠のもので
あるが，この焼鈍により表層部も軟化してしまう。した
がってコインとしての取扱い時に, コイン同志,コイン
以外の物体やマシン等との擦れあいにより表層部に疵が
ついたり, 表層部の一部が剥離したりするという問題が
ある。The finish annealing after cold rolling in the manufacturing process of the stainless steel sheet for coins described above is indispensable for securing coining properties (especially softening). The surface layer also softens. Therefore, when handled as a coin, there is a problem that the surface layer is scratched or a part of the surface layer is peeled off due to friction with coins, objects other than coins, machines, and the like.
【０００６】この剥離や疵付きは, 仕上げ焼鈍後の酸洗
処理によって一層助成される。仕上げ焼鈍後の酸洗は焼
鈍によって生じてた酸化スケールを除去するうえで不可
欠のものであり，Ｈ2ＳＯ4,ＨＮＯ3,ＨＦ＋ＨＮＯ3など
の化学薬品を使用して行われるが, そのさい, ステンレ
ス鋼板表層部において耐食性の低い結晶粒界がより侵蝕
され, このために結晶粒が脱落しやすい状態になるから
である。また，この侵蝕された結晶粒界が起点となって
擦れあい時に疵がつきやすくなるからである。[0006] The peeling and flaws are further promoted by pickling treatment after finish annealing. The pickling after the final annealing is indispensable for removing the oxide scale generated by the annealing, and is performed using a chemical such as H 2 SO 4 , HNO 3 , and HF + HNO 3 . This is because the grain boundaries with low corrosion resistance are more eroded in the surface layer of the stainless steel plate, and as a result, the grains tend to fall off. Also, the eroded crystal grain boundaries serve as a starting point to easily cause flaws at the time of rubbing.
【０００７】したがって，従来の通常の製造法によるス
テンレス鋼コインは，コイン容器やマシン内に多量の摩
耗粉が発生し，これがコイン表面に付着してコイン使用
時に手が汚れるという問題を有した。のみならず，表層
部が剥離したり疵が発生することはコイン寿命の点から
望ましいことではない。[0007] Therefore, the conventional stainless steel coin manufactured by a normal manufacturing method has a problem that a large amount of abrasion powder is generated in a coin container or a machine, which adheres to the coin surface and stains the hands when the coin is used. In addition, it is not desirable from the viewpoint of the life of the coin that the surface layer is peeled or flawed.
【０００８】このようなことから，刻印が鮮明に行える
ような良好なコイニング性を兼備しながら, コイニング
加工後には表層部に適度な硬さを有して耐摩耗性に優れ
たコインとなるコイン用ステンレス鋼板素材の出現が強
く望まれた。本発明はこの課題の解決を目的としたもの
である。[0008] For this reason, after coining, the coin has a moderate hardness in the surface layer and is excellent in wear resistance while having good coining properties so that engraving can be clearly performed. The appearance of stainless steel sheet materials for industrial use has been strongly desired. The present invention has been made to solve this problem.
【０００９】[0009]
【課題を解決するための手段】本発明は，Ｃrを１２重
量％以上含有するステンレス鋼製コインを製造するにあ
たり，製品板厚まで冷間圧延した該ステンレス鋼の冷延
鋼板を５容量％以上のＮ2を含むＨ2＋Ｎ2雰囲気下で焼
鈍して表面硬さがＨv 220以上，板厚中央部の硬さがＨv
160以下（表面から50μmの深さからの内部硬さがＨv 1
60以下）の鋼板とし，この鋼板を酸洗することなくコイ
ン製造用素材に供することを特徴とする。According to the present invention, in producing a stainless steel coin containing Cr in an amount of 12% by weight or more, a cold-rolled steel sheet of the stainless steel cold-rolled to a product thickness of 5% by volume or more is used. Annealed in an H 2 + N 2 atmosphere containing N 2 , the surface hardness is Hv 220 or more, and the hardness at the center of the plate thickness is Hv
160 or less (Internal hardness from a depth of 50 μm from the surface is Hv 1
60 or less), and this steel sheet is used as a material for coin production without pickling.
【００１０】[0010]
【作用】ステンレス鋼コインに要求される十分な耐食性
を得るには12重量％以上のＣrを含有することが必要で
あり，このために本発明はＣr 12重量％以上のステンレ
ス鋼を対象とするが，そのほか，コインの用途に応じて
必要な強度や加工性, コイニング性さらには耐食性等の
特性を向上させる元素, 例えばＭn,Ｓi,Ｎi,Ｃu,更には
Ｔi,Ｎb,Ｚr,V,Ａl,Ｍo,Ｂ等の元素を必要に応じて含有
することもでき,これらの元素の含有によってフエライ
ト系またはオーステナイト系のステンレス鋼となること
を問わない。In order to obtain the sufficient corrosion resistance required for stainless steel coins, it is necessary to contain Cr in an amount of 12% by weight or more. Therefore, the present invention is intended for stainless steels in which Cr is 12% by weight or more. However, there are other elements that improve the properties such as strength, workability, coining properties, and corrosion resistance required according to the use of the coin, such as Mn, Si, Ni, Cu, and also Ti, Nb, Zr, V, and Al. , Mo, B and the like may be contained as necessary, and it does not matter whether ferrite or austenitic stainless steel is obtained by containing these elements.
【００１１】本発明によれば，先ずこのステンレス鋼の
熱延鋼帯または熱処理を施したステンレス鋼熱延鋼帯を
冷間圧延することによってコインとしての目標板厚を有
する冷延鋼帯を製造する。冷間圧延は中間焼鈍を挟んだ
複数回冷間圧延を行なうこともできる。この最終冷間圧
延の後に５容量％以上のＮ2を含むＨ2＋Ｎ2雰囲気下で
焼鈍して表面硬さがＨv 220以上，板厚中央部の硬さが
Ｈv 160以下の鋼板とする。According to the present invention, a cold-rolled steel strip having a target thickness as a coin is manufactured by cold-rolling the hot- rolled stainless steel strip or the heat-treated stainless steel strip. I do. In the cold rolling, cold rolling may be performed a plurality of times with intermediate annealing. After this final cold rolling, the steel sheet is annealed in an atmosphere of H 2 + N 2 containing 5% by volume or more of N 2 to obtain a steel sheet having a surface hardness of Hv 220 or more and a hardness at the center of the sheet thickness of Hv 160 or less.
【００１２】この焼鈍において，Ｎ2の果たす役割は大
きく, 焼鈍時におけるステンレス鋼板表面の酸化スケー
ル付着を防止することはもとより, コイニングを損なう
ことなく耐摩耗性を表面に付与する作用を供する。すな
わち，Ｎ2雰囲気中または５％以上のＮ2を含むＮ2＋Ｈ2
雰囲気中にて焼鈍を施すと鋼板表面に酸化スケールの付
着を防止でき，このために焼鈍後の酸洗が不要となる。
従って酸洗によるステンレス鋼板表層部の結晶粒界侵蝕
が阻止できる。In this annealing, N 2 plays a large role, and not only prevents the adhesion of oxide scale on the surface of the stainless steel plate during annealing, but also provides the function of imparting wear resistance to the surface without impairing coining. That, N 2 + H 2 containing N 2 atmosphere or 5% or more of N 2
When annealing is performed in an atmosphere, the adhesion of oxide scale to the steel sheet surface can be prevented, and therefore, pickling after annealing becomes unnecessary.
Therefore, the grain boundary erosion of the surface layer of the stainless steel plate by pickling can be prevented.
【００１３】また, この焼鈍によってステンレス鋼板表
層部に窒化層が形成され，これによって表層部のみ硬さ
が上昇してコインの耐摩耗性を付与することができる。
この場合, 表面硬化層の表面の硬さがＨv 220以上, 内
部硬さがＨv 160以下となるように焼鈍を実施する。Ｈv
220以上の硬化層の深さは５μm程度が望ましい。５μm
以上の硬化層を形成させても耐摩耗性の面からは支障を
生じないが，あまり硬化層が深くなるとコイニング性が
低下するようになるからである。他方, 板厚中央部の硬
さはＨv 160以下とする。板厚中央部の硬さがＨv 160を
越えるとコイニング時のコイニング性が劣るようにな
る。そのさい，望ましくは鋼板表面より50μmを越えた
内部の硬さをＨv 160以下とする。[0013] In addition, a nitride layer is formed on the surface layer of the stainless steel plate by this annealing, whereby the hardness of only the surface layer is increased and the wear resistance of the coin can be imparted.
In this case, annealing is performed so that the surface hardness of the surface hardened layer is Hv 220 or more and the internal hardness is Hv 160 or less. Hv
The depth of the hardened layer of 220 or more is desirably about 5 μm. 5 μm
Even if such a hardened layer is formed, no problem is caused in terms of abrasion resistance, but if the hardened layer is too deep, the coining property is reduced. On the other hand, the hardness at the center of the sheet thickness is set to Hv 160 or less. If the hardness at the center of the sheet thickness exceeds Hv 160, the coining property during coining becomes inferior. At that time, desirably, the internal hardness exceeding 50 μm from the steel sheet surface is set to Hv 160 or less.
【００１４】図１に，後述実施例における代表例につい
て，焼鈍後の表層からの硬さ分布を比較例と対比して示
した。硬さ分布は鋼板表面から中央部に向かって指数関
数的に低下し，本発明に従う焼鈍によって鋼板表面近傍
の硬さをＨv 220以上，表面より50μmを越えた内部の硬
さをＨv 160以下とすることができる。FIG. 1 shows the hardness distribution from the surface layer after annealing in comparison with a comparative example for a representative example in the examples described later. The hardness distribution decreases exponentially from the steel sheet surface toward the center, and the hardness in the vicinity of the steel sheet surface is increased to Hv 220 or more and the internal hardness exceeding 50 μm from the surface is reduced to Hv 160 or less by annealing according to the present invention. can do.
【００１５】[0015]
【実施例】表１に供試材ステンレス鋼の７鋼種（No.1〜
No.7）の化学成分値を示した。これらの供試材は高周波
真空溶解法にて12kg溶製し，熱間圧延にて 3.8mm厚の熱
延鋼帯とし，この熱延鋼帯に焼鈍と酸洗を施したうえ，
1.5mm厚まで冷間圧延した(冷間圧延率60％)。これらの
冷延鋼帯を表２に示した熱処理温度と（Ｎ2＋Ｈ2)雰囲
気組成（容量％）のもとで焼鈍を施した。また，比較例
として大気焼鈍および酸洗を施した。(Ｎ2＋Ｈ2)雰囲気
中にて焼鈍を実施した材料については酸洗を実施してい
ない。[Examples] Table 1 shows the seven types of stainless steel (No.
No. 7). 12 kg of these test materials were melted by high-frequency vacuum melting, hot-rolled to form a hot-rolled steel strip of 3.8 mm thick, and this hot-rolled steel strip was annealed and pickled.
It was cold rolled to a thickness of 1.5 mm (cold rolling rate 60%). These cold-rolled steel strips were annealed at the heat treatment temperature and the (N 2 + H 2 ) atmosphere composition (volume%) shown in Table 2. As comparative examples, air annealing and pickling were performed. Pickling was not performed on the material that had been annealed in the (N 2 + H 2 ) atmosphere.
【００１６】得られた各材料について摩耗試験および硬
さ調査を行った。摩耗試験は50gの荷重にて 0.5/secの
速度で3000回材料同志を摺動させ, 生成した摩耗粉の量
で耐摩耗性を評価した。硬さ試験は超マイクロビッカー
ス硬度計 (荷重５ｇ）を使用し，鋼板表面と鋼板中央部
の硬さ調査を実施した。また一部の試料については表層
部を少量ずつ電解研磨し，表面から板厚中央方向への硬
さ分布を測定した。また窒化の程度を見るために焼鈍後
の鋼の窒素分析(mass%) も行った。さらに実機コイニン
グマシンで模様づけ (刻印）を行い, 模様の鮮明度を目
視判定し, コイニング性を評価した。これらの結果を表
２および図１に示した。Each of the obtained materials was subjected to a wear test and a hardness test. In the abrasion test, the materials were slid 3,000 times at a speed of 0.5 / sec under a load of 50 g, and the abrasion resistance was evaluated based on the amount of generated abrasion powder. In the hardness test, the hardness of the steel sheet surface and the central part of the steel sheet were investigated using an ultra-micro Vickers hardness tester (5 g load). For some samples, the surface layer was electropolished little by little and the hardness distribution from the surface to the center of the plate thickness was measured. Nitrogen analysis (mass%) of the annealed steel was also performed to check the degree of nitriding. Furthermore, patterning (engraving) was performed with a real coining machine, and the sharpness of the pattern was visually judged to evaluate the coining property. The results are shown in Table 2 and FIG.
【００１７】[0017]
【表１】 [Table 1]
【００１８】[0018]
【表２】 [Table 2]
【００１９】表２の結果に見られるように，比較例の示
す大気中での仕上げ焼鈍−酸洗の材料，焼鈍雰囲気中の
窒素値が５容量％未満の材料においては，鋼板表面の硬
さはＨv 200以下であり, 鋼板中央部の硬さより若干高
い値を示す程度である。従って表面が軟らかいことと,
酸洗時の表面結晶粒界侵食があることから摩耗粉量が多
量に検出されている。また熱処理温度が低いため鋼板中
央部の硬さＨv が160を越える材料は，コイニング時の
メタルフローが十分でないため模様の鮮明度が得られず
コイニング性に劣っている。As can be seen from the results shown in Table 2, the hardness of the steel sheet surface was higher in the materials of the finish annealing-pickling in air and the materials having a nitrogen value of less than 5% by volume in the annealing atmosphere as shown in the comparative examples. Is less than Hv 200, indicating a value slightly higher than the hardness of the central part of the steel sheet. Therefore, the surface is soft,
A large amount of wear powder has been detected due to surface grain boundary erosion during pickling. Further, a material having a hardness Hv of more than 160 at the center of the steel sheet due to a low heat treatment temperature does not have sufficient metal flow at the time of coining to obtain a clear pattern and is inferior in coining properties.
【００２０】これに対し, 本発明例の窒素値が８容量％
または25容量％の雰囲気中にて焼鈍を実施した材料の表
面硬さはいずれもＨv 220以上の高い値を示すととも
に，中央部の硬さＨv は160以下を示している。また表
２の製品材の窒素値が表１の窒素値より高くなってお
り，この熱処理による窒素値の上昇が表面硬さの上昇に
寄与していることがわかる。そして本発明例No.1〜14に
従ういずれの材料も摩耗粉量は全く検出されておらず，
且つ鋼板中央部の硬さがＨv 160以下になる条件にて焼
鈍されたことによりコイニング性も良好である。On the other hand, the nitrogen value of the present invention was 8% by volume.
Alternatively, the surface hardness of the material annealed in an atmosphere of 25% by volume shows a high value of Hv 220 or more, and the hardness Hv of the central portion shows 160 or less. Further, the nitrogen value of the product material in Table 2 is higher than the nitrogen value in Table 1, and it can be seen that the increase in the nitrogen value due to this heat treatment contributes to the increase in the surface hardness. And, in any of the materials according to the present invention examples No. 1 to 14, the amount of wear powder was not detected at all,
In addition, since the steel sheet is annealed under the condition that the hardness of the central portion of the steel sheet becomes Hv 160 or less, the coining property is good.
【００２１】このような本発明の成果は, 図１の断面硬
さ分布からも説明できる。すなわち比較例No.13のごと
く摩耗粉が多量に観察された大気焼鈍 (1150℃)・酸洗
材は表層部および中央部とも硬さはＨv 220より低く,
また比較例No.14のようにコイニング性の劣る材料は表
層部もさることながら中心部の硬さがＨv 160を越える
硬質な材料となっている。これに対し本発明例No.7,8の
ごとく耐摩耗性，コイニング性ともに優れた，窒素25％
＋水素75％, 窒素８％＋水素92％雰囲気 (1150℃) にて
焼鈍を実施した材料は，表面より５μm以内の硬さがＨv
220以上で表面より50μmを越えた内部ではＨv 160以下
の軟質な材料となっている。このように, 表面近傍だけ
がコインにとって好ましい状態に硬くなったのは, 前述
表２の製品材窒素の増加が表面近傍に集中しているから
であると考えてよい。Such a result of the present invention can be explained also from the sectional hardness distribution in FIG. That is, as in Comparative Example No. 13, a large amount of wear powder was observed in air annealing (1150 ° C).
Further, the material having poor coining properties as in Comparative Example No. 14 is a hard material whose hardness at the center exceeds Hv 160 as well as the surface layer. On the other hand, as shown in Examples Nos. 7 and 8 of the present invention, 25% nitrogen having excellent wear resistance and coining properties
Material annealed in an atmosphere of + 75% hydrogen, 8% nitrogen + 92% hydrogen (1150 ° C) has a hardness of less than 5 μm from the surface, Hv
A soft material having a Hv of 160 or less is formed in the inside of the surface exceeding 50 μm from the surface at 220 or more. Thus, the reason that only the vicinity of the surface is hardened to a preferable state for the coin can be considered to be because the increase of the product material nitrogen in Table 2 is concentrated near the surface.
【００２２】[0022]
【発明の効果】以上のように本発明よれば，鋼板内部は
軟質で鋼板表面部のみ硬化した材料が得られるため，疵
が付きにくく耐摩耗性およびコイニング性に優れたコイ
ン用ステンレス鋼板素材を得ることができる。そして本
発明は現在の工業技術で可能な製造技術によってステン
レス鋼にコイニング性および耐摩耗性を付与することが
できたものであるから, 良品質のステンレス鋼コインを
経済的有利に供給することができる。As described above, according to the present invention, it is possible to obtain a material in which the inside of the steel sheet is soft and the surface of the steel sheet is hardened, so that a stainless steel sheet material for coins which is hardly flawed and has excellent wear resistance and coining properties can be obtained. Obtainable. And, since the present invention was able to impart coining properties and abrasion resistance to stainless steel by the manufacturing technology possible with current industrial technology, it is possible to economically supply high quality stainless steel coins. it can.
【図１】 本文中の実施例および比較例の焼鈍後の材料
の断面硬さ分布を示した図である。FIG. 1 is a diagram showing a cross-sectional hardness distribution of materials after annealing in Examples and Comparative Examples in the text.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小田 敬夫 山口県新南陽市野村南町4976番地 日新 製鋼株式会社鉄鋼研究所内 (72)発明者 大久保 直人 山口県新南陽市野村南町4976番地 日新 製鋼株式会社鉄鋼研究所内 (56)参考文献 特開 昭62−27902（ＪＰ，Ａ) 特開 昭52−3533（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C21D 9/46 - 9/48 C21D 9/00 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takao Oda 4976 Nomura Minamicho, Shinnanyo-shi, Yamaguchi Prefecture Inside the Steel Research Laboratories of Nissin Steel Co., Ltd. (56) References JP-A-62-27902 (JP, A) JP-A-52-3533 (JP, A) (58) Fields studied (Int. Cl. 7 , DB name) C21D 9 / 46-9/48 C21D 9/00
Claims (2)
鋼製コインを製造するにあたり，製品板厚まで冷間圧延
した該ステンレス鋼の冷延鋼板を５容量％以上のＮ2を
含むＨ2＋Ｎ2雰囲気下で焼鈍して表面硬さがＨv 220以
上，板厚中央部の硬さがＨv 160以下の鋼板とし，この
鋼板を酸洗することなくコイン製造用素材に供すること
を特徴とするコイン用ステンレス鋼の製造法。In producing a stainless steel coin containing Cr in an amount of 12% by weight or more, a cold rolled stainless steel sheet cold-rolled to a product thickness is made of H 2 + N containing 5% by volume or more of N 2. (2) A coin characterized by being annealed in an atmosphere to form a steel sheet having a surface hardness of Hv 220 or more and a hardness at the center of the sheet thickness of Hv 160 or less, and using this steel sheet as a material for coin production without pickling. Manufacturing method for stainless steel.
鋼製コインを製造するにあたり，製品板厚まで冷間圧延
した該ステンレス鋼の冷延鋼板を５容量％以上のＮ 2 を
含むＨ 2 ＋Ｎ 2 雰囲気下で焼鈍して表面硬さがＨv 220以
上，表面から50μmの深さからの内部硬さがＨv 160以下
の鋼板とし，この鋼板を酸洗することなくコイン製造用
素材に供することを特徴とするコイン用ステンレス鋼の
製造法。2. A stainless steel containing at least 12% by weight of Cr.
Cold rolling to product thickness when producing steel coins
Was a N 2 cold rolled steel sheet more than 5% by volume of the stainless steel
Hv 220 is a surface hardness in annealed in H 2 + N 2 atmosphere containing more than
Top, Hv 160 or less from 50 μm depth from the surface
Steel sheet for coin production without pickling.
A method for producing stainless steel for coins, which is provided as a material .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03083239A JP3100417B2 (en) | 1991-03-23 | 1991-03-23 | Manufacturing method of stainless steel for coins |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03083239A JP3100417B2 (en) | 1991-03-23 | 1991-03-23 | Manufacturing method of stainless steel for coins |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04293727A JPH04293727A (en) | 1992-10-19 |
| JP3100417B2 true JP3100417B2 (en) | 2000-10-16 |
Family
ID=13796775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03083239A Expired - Fee Related JP3100417B2 (en) | 1991-03-23 | 1991-03-23 | Manufacturing method of stainless steel for coins |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3100417B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06126499A (en) * | 1992-07-31 | 1994-05-10 | Suzuki Seisakusho:Kk | Working control method for high-precision molded article and highly accurate dimensional control device for molded article |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6257417B2 (en) * | 2014-03-31 | 2018-01-10 | 新日鐵住金ステンレス株式会社 | Austenitic stainless steel wire rod and steel wire for non-magnetic game balls |
| KR102337736B1 (en) * | 2017-04-26 | 2021-12-09 | 엑시파니테 테크놀로지 에이/에스 | assembly parts |
-
1991
- 1991-03-23 JP JP03083239A patent/JP3100417B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06126499A (en) * | 1992-07-31 | 1994-05-10 | Suzuki Seisakusho:Kk | Working control method for high-precision molded article and highly accurate dimensional control device for molded article |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04293727A (en) | 1992-10-19 |
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