CA2137096A1 - Plated coin and a method of producing the same - Google Patents
Plated coin and a method of producing the sameInfo
- Publication number
- CA2137096A1 CA2137096A1 CA 2137096 CA2137096A CA2137096A1 CA 2137096 A1 CA2137096 A1 CA 2137096A1 CA 2137096 CA2137096 CA 2137096 CA 2137096 A CA2137096 A CA 2137096A CA 2137096 A1 CA2137096 A1 CA 2137096A1
- Authority
- CA
- Canada
- Prior art keywords
- core
- plated
- coin
- proof strength
- 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.)
- Abandoned
Links
Classifications
-
- A—HUMAN NECESSITIES
- A44—HABERDASHERY; JEWELLERY
- A44C—PERSONAL ADORNMENTS, e.g. JEWELLERY; COINS
- A44C21/00—Coins; Emergency money; Beer or gambling coins or tokens, or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
- B32B15/015—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium the said other metal being copper or nickel or an alloy thereof
Landscapes
- Electroplating Methods And Accessories (AREA)
Abstract
The invention concerns procoss for the production of coins consisting mainly of chromium steel, the blanks for stamping consisting of a stainless steel core with an 0.2% proof strength of at least 200 N/mm2, plated on either side with non-ferrous metal, preferably consisting of 60% to 100% copper, whose 0.2% proof strength is a minimum of 40 N/mm2 below the 0.2% proof strengh of the core.
Description
01 DEZ '94 16:24 COHfWSZ & FLOR~CK PRTENTRNI~IRELTE P.4 al370s6 BACRGROUND OF THE INVEN~IO~I
The imention is based on the well-known production of coins using stainle5s steel plated blanlcs, ie. blanks cons:>~;- g of a co..,~Gsite sar,d~icll confo~ g to DE ~8 17 657 Al ~th a ferritic chromium steel corc plated on either side with higha quality ~ustenitic chro.,-iu~-- nickel steel.
Mints are as a general rulc conservative in thcir a~titude and seldom depart from co..v~.lional techniq.,~ ~ The face value of a coin u~ed to be equal to the ~alue of the weight of copper, silver or gold it cG~t~ r~i The inc~eas;~g demand for coins resulting ~rom ;...Iu~ io., and the growth of CO~IU~ ICC meant that, from thc nud-r.;..~tcen~h century onwards, the metsl value of the coms in circulation camc tor.,~r~,.e.lt a mere ~action of their nonunal Yaluc. When replacing the t~dition~l coinage metals, namely gold and silver, with other matcrials ~lle...~ were o~en made to rctain the colour ofthe coins, using niclcel as a sobstinlte for silver and cert~n alloys of copper instead of gold.
As early as 1920, Ullmann's "Enzyklop~die der tccluu5~,11e.l Chemie" (Urban &
Sch-40u4e~n~c~, 8th edinon, 1920), p 59 ff., ~ives various methods of plating core matenals. On p. 71, in panicular, the plating of cop~,l~-c and copl~e,~:~nc/niclcel alloys ~nth copper, iron and steel is descnbed, vvhich at least gives the outward impression th~t the coin is made ofthe matenal uscd to platc it.
If, ho~-~, it is intended to use such plating p~ocesses to produce an cspccially cheap coin onc possibility is to roll-clad p1ain carbon steel strip on both sides with higher ~uality metal and punch blanks out for ~ ;ng as coin. Rumania in thc carly 1940swas the first countly to introduce nickel plated steel coins (denolnin~tion 100 lei) m~nuf~ctl-red by this process. The plating on cither side accounted for 3 .5% of the coin's thickness; its weight WaQ 8.5 g and its tiametet 28 mm. The p~ nQ werefollowed by the Bu~garians who uscd an 80~/o copper/20% nickel alloy to pla~e their coins 'rbe success of this method in these COUI~tlieS resulted in plated coins of this kind being introduccd in Germany in ls48. Thcse were 1, ~ and 10 pfcnniE~ pieces, followed somewhat later by a 2 pferu~ig piece.
DEC I ' 94 1 1 :23 +49 21 1 9049049 PRGE .004 -01 DEZ '94 16:Z4 COH~USZ ~ FLORRCK PRTENTR~WRELTE P.5 Coins struck ~om rolled co,npos;tes of this l~nd have edges at which the carbon steel core is ~posed Even though the thin film of higher quali~ plating drawn over these edges when the blanks are punched out is soon abraded by ~qn~lling. this does not co.,~ u~e a problcm in our te.~ . .te climlte In thc tropic~ rusting is more app~ ..t and tho edges havc to be protecled. One way of doing th~s i9 elcctroplating blank~
made ~om rolled Co~lpGSitCs with higher qualisy metals in accordance with DE 39 40 244 Al.
Another possibility is to electroplat~ plain carbon steel blanlcs all o~er.
A disa~v~ntage of clc~rùpla~ing is the problem of env;,~ c..~-fricndly dispostl of the waste water from the process. The finishir~g of rolled composites by electroplating also constitutes a cost factor that grows in sig.~ificau~ce in imcr-le proportion to the ssze of he coins ~lecsroplating the srnaller coins in a series cu,,,p,;~--g diff~rent sizes take~ a dis~ropo, .iona~e amo~nt of time.
In this linc of developmr~ t thc stainless steel coin c~l rG~ n~ to DE 38 17 6S7 A1 dcl~ ,ib~ at thc outset meets the requirernent of increased corrosion rcs;~lance, when used in the maMer snd for the purposc ~ ;sa~, and can bc ,. ~ ~ by the efficies~t and c~ono.,l;~l rolling process, protucing a rolled composite c.~.-c;~l;ng of a stainless stcel core plated with stainless steel and blanks r. ~ui~h~g no electroplating and gi~ing risc to nonc ofthe ~ nl cnv;.on .~ *l p~b1e...s.
The stainle~s stee3s used, namely X6Crl7 for the core u~d X5CrN119I I for ~he plating, are both suitable for hcading ant lhc. ~fol ~ for coinage and are 50 similar with regard to the relevant prop~ s of stren8th ~hat the cor.,pGs;Le tak~s the starnp well despite the hi8h solidity of thc corc.
Ha-ving said this, it must be added that the hi8her strength ofthe core by c~ ;son with copper plated carbon steel blanks rcquires more mec~nical force and, in particular, more wear resistant ,~."~,ing tools when ~hc coins arc struck DEC I ' 94 1 1 :Z3 +49 21 1 9049049 Pf:lGE.005 01 DEZ '94 16: 25 COHRlJSZ ~ FLORf~CK PRTENTR~RELTE 2 1 3 7 0 9 6 P. 6 .
The p~lc n~ involYet in minting stainlcs~ steel coins havc accor~ ly bcen ~
rc_u.~ obstacle so ~heir uridu~ead usc The high 0.2% proof strcn~th of the requisite stainless steels - at lcas~ ~00 I~lmrn~ in thc case of a~ e XSCrNil810(Gerrnan Matcrial~ S~andard 1.4~01) ~nd X5Cr~i l 812 (Garnan ~aterials Standard 1.4303) and at least 2S0 N/mm~ in the case of fcrrite X6Crl7 (Gcrman Materi~ls Stantart 1.4306) - pcnnits only a low relicf, ic a vcry fl~ stamp i.n~es~on, thehei~h~ of thc rclief being unable to exceet that of the onginal rollcd matcrial by more than approx 20%.
In addition to the lovr relicfthat has hitherto been a.,L,~ ~'e wcar ~n the ~ g tool is vcly grcat as a result of the hardncss ofthe stainlcss steds used. ~hcrea- the h~.J... ss value of soft a~lne~led ferntfc CL,~ IJ~ steel X6Crl7 may be bctvveen I45 and lS5 HV 30, a muc~t lower hardncss can be achie ed ~rith non-ferrous metals, eg 70 to 85 HV 30 tn thc case of copper alloys. Given that the savice life of the ~"'Y;"8 tool r~ 5~n~5 ~ complcx function of n~ll,e.vus factors inct.Jdi-,g matial, shape, stroke speed etc., thc hardness of the coin blank is nnn~theless one of the major influ~cn.
The aim of the in~'e.~ti~A iS to produce an il~c ~ycl~7;~., plated coin requ~.tng no l.cat,.l~lt of the edges after the blanks havc becn punched out to assure ad! ~ e conro~;on rP~ noc, even if the coins are to be expose~ to l-..fa~,ou-~'c co~ ons~
which is cnvironnlc.~l-friendly and ~c~r~ b'c, docs not a.lv~,seJy af~ect thc sen~ice life of the stamping tools ~nd offers more scope with re8ard to relief impression.
DESCRIP~ION OF TH~ NTION
The invention relates to a plated coin consisting of a minimum 80 ~ by mass of chromuum steel with a ferritic, austenitic or duplex stmcture wherein the core consiscs of soft or solution ~nne~l ed stainless steel whose o, 2 ~ proof strength at room teT:~perature is at least 220 N/mm2, plated or~
either side with non-~errous ~netal whose 0, 2 ~ proof strength is a minimvm of 40 N/mm2 below the 0, 2 ~ proof strength of che core.
Surprisingly, the bi8 ~li~, e..ce in the 0 2% proof ,~ th~, ie. forming the hardstainless stccl through a r.,l~ti~_ly soft int~,.,..cdh~c snaterial, presents no obstacle to ~tta;~lmenr ofthe dcsired rcliefimpression and no s;an;~ shortening ofthe sesvice life of the ,l A "l-;"g tools was observed. Appar~ .~tl~ the soft plating works as a lubricant betweal the stamping tool and the contours of the hl~pre~;on.
The vely much lower 0.2% proof ~ .l.s of the non-ferrous me~als - eg. only max.
100 Nlrnrn2 in the case of soft anncalcfJ copper, max. 160 Nl~run2 in the casc of so*
n~ t brass Cu~8 and ~nax 150 NIITun2 in the r.,asc of so~ nr~1e~ tin bronze CuSn2 - ~u~,.;a;n~l~ permit thc ~lr:~ ~ At of a Yery much deeper and c~caner i,n~cs~;on despite thc stainlcss steel corc, ~ ;~B~B the disat~ar tage ofthe flat ~ .on p.u...,ced on stainless sled by about one half~ depc~ g on thc ~h ~L ..~5 of thc plating, and n ~ ~ a. J;ngly ~. v. h d ng a ~gh relie DEC I '94 1 1 :24 +49 21 1 9049049 PF~GE .006 01 DEZ '94 16: Z5 COHÇWSZ 8~ FLORÇ~CK PF~TENTR~I~ELTE P. 7 ~ 2137(196 These findings led to the use of higher strength stainlcss steeis and a further development involving the ~h ~ g of blsnks with a soft or solution aMealet stainless steel corc whose 0.2% proof strength is at least 220 N/mm2, plsted on either side with non.ferrous metal whosc 0.2% proof strcngth is a min;-rlu-rt of 25% below the 0.2%
proof strength of thc core.
From the point of vie~ of cconG~ it was especially advantageous to producc coiris with a ~tainless steel core made up (in % by mass) 29 follows (German Materials Standard 1.4003) C s0.03 Si S2.0 Mn 0.S to 1.5 P 5 0.045 S 5 0.030 N c0.03 Cr 10.S to 12.S
- Nl 0.3 to I
,dcr iron and smetting impunties.
With modem methods of steel p,od~ ;on it i8 possiblc to make stainless steel vcr,Y
cheaply ant adapt it - as in the case of the stainless sted referrcd to abovc which co.lfo~n.s to Ge~nan Materials Standard 1.4003 - to resist certain kinds of co--vs;~,c i"nucnce, ie. to be econu"ucal with e,.p~ s,~e alloy ,Olllj)O~,.ltS.
The p.~fc.~d metals for plating arc non-ferrous alloys con~ ;ng 60% to 1Q0%
copper. Copper alloys such as brass containing at least 1% to 2.S% by mass tin are cquslly suita~le Copper alloys in particular offer the possibility of varying colour, eg. the reddish tone of pure copper and ~he gold tone of brass, 71tho~gh it must be noted that the ed~e of the coin will bc of a different colour. Wlth a view to the easy distinction bctween coins that is otcen desired particularly in less afrluent countries, the inYeMion offers a Yariety of colours and colour co"t,d,Ls including coins with a reddish to yellow face and a bllle-white to off-white ed8e or, alternatively, a largely uniform o~verall colour with a white face and blue-white to off-white edge. On the other hand, the carbon steel core Ii3cdy to be used in such countries will lead to the edge bcco.. ~.ng dirty 8rey-biack with use or, in the tropics, even rusty.
Aside from such cons;d~ ions, it is also advantageous to be able ~o s~a~np the blanks punched out of rolled co"~ os;l~ strip con,;s~ing of a stainless steel core plated on both sides without having to cl~l~6~e the edges.
Examples of coins produced in accordance with the invention are as follows.
1. Copper with an 0.2~l/D proof strength of max. 100 NlrNn: on austenitic steel XSCrNi l 810 (Gerrnzn Materials Standart 1.4301) with an 0 2% proof strengh - of at least. 200 Nlmm' The plating is rolled on to the core to a th~cL-npss of 2 x 3% coppcr ant thc resultant co.,.posi~e strip made into coins. The faccs and edges of thc coins c~ince no noteworth~ di~.c.~ce in corrosion re, ~ e when used in the manner and for the pu~pose e..~;s~ged.
DEC I ' 94 ~ I :25 +49 21 1 9049049 Pf~GE.007 01 DEZ 94 16:26 COHf~USZ ~ FLOR~CK P~TENTRNWRELTE 2137û96 P.8 The blue-white colour of the edge provides a clear contrast ~nth the reddish colour of ~he faces. Both the production scrap and the coins themselves can be re~ycled and used for the production of speci~l alloy., cont~inir~g copper such as X3CrCuMoTi2723 (German Materials Standard 1.4S03), MCr20CuMo (Ge~marl Materials Standard Z.45~3) and NiC~2lMo (Gcrman Matenals Standard 2.S858) 2. Brass CuZn28 4ith ar 0.2% proofstrength of max. 160 NJmrn2 on ausi~,.ul;c stéel X~CrNil81Z (German Mataials Standard 1.4303) with an 0.2% proof strength of at least. 200 N/mm2 and norrnally 220 Nlrnrn2 to 250 N/rnrn~. The plating is rolled on to the core to a thicl~ness of 2 x 2.5% brass and the resultant co."~ e strip made into coins. The faces and edges of the coins evince no no~eworthy Ji~ ce in corrosion ~ ce ~hen used in the manner and for the purpo.,e envisaged. The blue.-white colour of the ed8e provides a clear contrast with the yellow colour of the faces. Both the production scrap and the coins themselves can be recycled in the usual way for bras~, p~ated coins.
The imention is based on the well-known production of coins using stainle5s steel plated blanlcs, ie. blanks cons:>~;- g of a co..,~Gsite sar,d~icll confo~ g to DE ~8 17 657 Al ~th a ferritic chromium steel corc plated on either side with higha quality ~ustenitic chro.,-iu~-- nickel steel.
Mints are as a general rulc conservative in thcir a~titude and seldom depart from co..v~.lional techniq.,~ ~ The face value of a coin u~ed to be equal to the ~alue of the weight of copper, silver or gold it cG~t~ r~i The inc~eas;~g demand for coins resulting ~rom ;...Iu~ io., and the growth of CO~IU~ ICC meant that, from thc nud-r.;..~tcen~h century onwards, the metsl value of the coms in circulation camc tor.,~r~,.e.lt a mere ~action of their nonunal Yaluc. When replacing the t~dition~l coinage metals, namely gold and silver, with other matcrials ~lle...~ were o~en made to rctain the colour ofthe coins, using niclcel as a sobstinlte for silver and cert~n alloys of copper instead of gold.
As early as 1920, Ullmann's "Enzyklop~die der tccluu5~,11e.l Chemie" (Urban &
Sch-40u4e~n~c~, 8th edinon, 1920), p 59 ff., ~ives various methods of plating core matenals. On p. 71, in panicular, the plating of cop~,l~-c and copl~e,~:~nc/niclcel alloys ~nth copper, iron and steel is descnbed, vvhich at least gives the outward impression th~t the coin is made ofthe matenal uscd to platc it.
If, ho~-~, it is intended to use such plating p~ocesses to produce an cspccially cheap coin onc possibility is to roll-clad p1ain carbon steel strip on both sides with higher ~uality metal and punch blanks out for ~ ;ng as coin. Rumania in thc carly 1940swas the first countly to introduce nickel plated steel coins (denolnin~tion 100 lei) m~nuf~ctl-red by this process. The plating on cither side accounted for 3 .5% of the coin's thickness; its weight WaQ 8.5 g and its tiametet 28 mm. The p~ nQ werefollowed by the Bu~garians who uscd an 80~/o copper/20% nickel alloy to pla~e their coins 'rbe success of this method in these COUI~tlieS resulted in plated coins of this kind being introduccd in Germany in ls48. Thcse were 1, ~ and 10 pfcnniE~ pieces, followed somewhat later by a 2 pferu~ig piece.
DEC I ' 94 1 1 :23 +49 21 1 9049049 PRGE .004 -01 DEZ '94 16:Z4 COH~USZ ~ FLORRCK PRTENTR~WRELTE P.5 Coins struck ~om rolled co,npos;tes of this l~nd have edges at which the carbon steel core is ~posed Even though the thin film of higher quali~ plating drawn over these edges when the blanks are punched out is soon abraded by ~qn~lling. this does not co.,~ u~e a problcm in our te.~ . .te climlte In thc tropic~ rusting is more app~ ..t and tho edges havc to be protecled. One way of doing th~s i9 elcctroplating blank~
made ~om rolled Co~lpGSitCs with higher qualisy metals in accordance with DE 39 40 244 Al.
Another possibility is to electroplat~ plain carbon steel blanlcs all o~er.
A disa~v~ntage of clc~rùpla~ing is the problem of env;,~ c..~-fricndly dispostl of the waste water from the process. The finishir~g of rolled composites by electroplating also constitutes a cost factor that grows in sig.~ificau~ce in imcr-le proportion to the ssze of he coins ~lecsroplating the srnaller coins in a series cu,,,p,;~--g diff~rent sizes take~ a dis~ropo, .iona~e amo~nt of time.
In this linc of developmr~ t thc stainless steel coin c~l rG~ n~ to DE 38 17 6S7 A1 dcl~ ,ib~ at thc outset meets the requirernent of increased corrosion rcs;~lance, when used in the maMer snd for the purposc ~ ;sa~, and can bc ,. ~ ~ by the efficies~t and c~ono.,l;~l rolling process, protucing a rolled composite c.~.-c;~l;ng of a stainless stcel core plated with stainless steel and blanks r. ~ui~h~g no electroplating and gi~ing risc to nonc ofthe ~ nl cnv;.on .~ *l p~b1e...s.
The stainle~s stee3s used, namely X6Crl7 for the core u~d X5CrN119I I for ~he plating, are both suitable for hcading ant lhc. ~fol ~ for coinage and are 50 similar with regard to the relevant prop~ s of stren8th ~hat the cor.,pGs;Le tak~s the starnp well despite the hi8h solidity of thc corc.
Ha-ving said this, it must be added that the hi8her strength ofthe core by c~ ;son with copper plated carbon steel blanks rcquires more mec~nical force and, in particular, more wear resistant ,~."~,ing tools when ~hc coins arc struck DEC I ' 94 1 1 :Z3 +49 21 1 9049049 Pf:lGE.005 01 DEZ '94 16: 25 COHRlJSZ ~ FLORf~CK PRTENTR~RELTE 2 1 3 7 0 9 6 P. 6 .
The p~lc n~ involYet in minting stainlcs~ steel coins havc accor~ ly bcen ~
rc_u.~ obstacle so ~heir uridu~ead usc The high 0.2% proof strcn~th of the requisite stainless steels - at lcas~ ~00 I~lmrn~ in thc case of a~ e XSCrNil810(Gerrnan Matcrial~ S~andard 1.4~01) ~nd X5Cr~i l 812 (Garnan ~aterials Standard 1.4303) and at least 2S0 N/mm~ in the case of fcrrite X6Crl7 (Gcrman Materi~ls Stantart 1.4306) - pcnnits only a low relicf, ic a vcry fl~ stamp i.n~es~on, thehei~h~ of thc rclief being unable to exceet that of the onginal rollcd matcrial by more than approx 20%.
In addition to the lovr relicfthat has hitherto been a.,L,~ ~'e wcar ~n the ~ g tool is vcly grcat as a result of the hardncss ofthe stainlcss steds used. ~hcrea- the h~.J... ss value of soft a~lne~led ferntfc CL,~ IJ~ steel X6Crl7 may be bctvveen I45 and lS5 HV 30, a muc~t lower hardncss can be achie ed ~rith non-ferrous metals, eg 70 to 85 HV 30 tn thc case of copper alloys. Given that the savice life of the ~"'Y;"8 tool r~ 5~n~5 ~ complcx function of n~ll,e.vus factors inct.Jdi-,g matial, shape, stroke speed etc., thc hardness of the coin blank is nnn~theless one of the major influ~cn.
The aim of the in~'e.~ti~A iS to produce an il~c ~ycl~7;~., plated coin requ~.tng no l.cat,.l~lt of the edges after the blanks havc becn punched out to assure ad! ~ e conro~;on rP~ noc, even if the coins are to be expose~ to l-..fa~,ou-~'c co~ ons~
which is cnvironnlc.~l-friendly and ~c~r~ b'c, docs not a.lv~,seJy af~ect thc sen~ice life of the stamping tools ~nd offers more scope with re8ard to relief impression.
DESCRIP~ION OF TH~ NTION
The invention relates to a plated coin consisting of a minimum 80 ~ by mass of chromuum steel with a ferritic, austenitic or duplex stmcture wherein the core consiscs of soft or solution ~nne~l ed stainless steel whose o, 2 ~ proof strength at room teT:~perature is at least 220 N/mm2, plated or~
either side with non-~errous ~netal whose 0, 2 ~ proof strength is a minimvm of 40 N/mm2 below the 0, 2 ~ proof strength of che core.
Surprisingly, the bi8 ~li~, e..ce in the 0 2% proof ,~ th~, ie. forming the hardstainless stccl through a r.,l~ti~_ly soft int~,.,..cdh~c snaterial, presents no obstacle to ~tta;~lmenr ofthe dcsired rcliefimpression and no s;an;~ shortening ofthe sesvice life of the ,l A "l-;"g tools was observed. Appar~ .~tl~ the soft plating works as a lubricant betweal the stamping tool and the contours of the hl~pre~;on.
The vely much lower 0.2% proof ~ .l.s of the non-ferrous me~als - eg. only max.
100 Nlrnrn2 in the case of soft anncalcfJ copper, max. 160 Nl~run2 in the casc of so*
n~ t brass Cu~8 and ~nax 150 NIITun2 in the r.,asc of so~ nr~1e~ tin bronze CuSn2 - ~u~,.;a;n~l~ permit thc ~lr:~ ~ At of a Yery much deeper and c~caner i,n~cs~;on despite thc stainlcss steel corc, ~ ;~B~B the disat~ar tage ofthe flat ~ .on p.u...,ced on stainless sled by about one half~ depc~ g on thc ~h ~L ..~5 of thc plating, and n ~ ~ a. J;ngly ~. v. h d ng a ~gh relie DEC I '94 1 1 :24 +49 21 1 9049049 PF~GE .006 01 DEZ '94 16: Z5 COHÇWSZ 8~ FLORÇ~CK PF~TENTR~I~ELTE P. 7 ~ 2137(196 These findings led to the use of higher strength stainlcss steeis and a further development involving the ~h ~ g of blsnks with a soft or solution aMealet stainless steel corc whose 0.2% proof strength is at least 220 N/mm2, plsted on either side with non.ferrous metal whosc 0.2% proof strcngth is a min;-rlu-rt of 25% below the 0.2%
proof strength of thc core.
From the point of vie~ of cconG~ it was especially advantageous to producc coiris with a ~tainless steel core made up (in % by mass) 29 follows (German Materials Standard 1.4003) C s0.03 Si S2.0 Mn 0.S to 1.5 P 5 0.045 S 5 0.030 N c0.03 Cr 10.S to 12.S
- Nl 0.3 to I
,dcr iron and smetting impunties.
With modem methods of steel p,od~ ;on it i8 possiblc to make stainless steel vcr,Y
cheaply ant adapt it - as in the case of the stainless sted referrcd to abovc which co.lfo~n.s to Ge~nan Materials Standard 1.4003 - to resist certain kinds of co--vs;~,c i"nucnce, ie. to be econu"ucal with e,.p~ s,~e alloy ,Olllj)O~,.ltS.
The p.~fc.~d metals for plating arc non-ferrous alloys con~ ;ng 60% to 1Q0%
copper. Copper alloys such as brass containing at least 1% to 2.S% by mass tin are cquslly suita~le Copper alloys in particular offer the possibility of varying colour, eg. the reddish tone of pure copper and ~he gold tone of brass, 71tho~gh it must be noted that the ed~e of the coin will bc of a different colour. Wlth a view to the easy distinction bctween coins that is otcen desired particularly in less afrluent countries, the inYeMion offers a Yariety of colours and colour co"t,d,Ls including coins with a reddish to yellow face and a bllle-white to off-white ed8e or, alternatively, a largely uniform o~verall colour with a white face and blue-white to off-white edge. On the other hand, the carbon steel core Ii3cdy to be used in such countries will lead to the edge bcco.. ~.ng dirty 8rey-biack with use or, in the tropics, even rusty.
Aside from such cons;d~ ions, it is also advantageous to be able ~o s~a~np the blanks punched out of rolled co"~ os;l~ strip con,;s~ing of a stainless steel core plated on both sides without having to cl~l~6~e the edges.
Examples of coins produced in accordance with the invention are as follows.
1. Copper with an 0.2~l/D proof strength of max. 100 NlrNn: on austenitic steel XSCrNi l 810 (Gerrnzn Materials Standart 1.4301) with an 0 2% proof strengh - of at least. 200 Nlmm' The plating is rolled on to the core to a th~cL-npss of 2 x 3% coppcr ant thc resultant co.,.posi~e strip made into coins. The faccs and edges of thc coins c~ince no noteworth~ di~.c.~ce in corrosion re, ~ e when used in the manner and for the pu~pose e..~;s~ged.
DEC I ' 94 ~ I :25 +49 21 1 9049049 Pf~GE.007 01 DEZ 94 16:26 COHf~USZ ~ FLOR~CK P~TENTRNWRELTE 2137û96 P.8 The blue-white colour of the edge provides a clear contrast ~nth the reddish colour of ~he faces. Both the production scrap and the coins themselves can be re~ycled and used for the production of speci~l alloy., cont~inir~g copper such as X3CrCuMoTi2723 (German Materials Standard 1.4S03), MCr20CuMo (Ge~marl Materials Standard Z.45~3) and NiC~2lMo (Gcrman Matenals Standard 2.S858) 2. Brass CuZn28 4ith ar 0.2% proofstrength of max. 160 NJmrn2 on ausi~,.ul;c stéel X~CrNil81Z (German Mataials Standard 1.4303) with an 0.2% proof strength of at least. 200 N/mm2 and norrnally 220 Nlrnrn2 to 250 N/rnrn~. The plating is rolled on to the core to a thicl~ness of 2 x 2.5% brass and the resultant co."~ e strip made into coins. The faces and edges of the coins evince no no~eworthy Ji~ ce in corrosion ~ ce ~hen used in the manner and for the purpo.,e envisaged. The blue.-white colour of the ed8e provides a clear contrast with the yellow colour of the faces. Both the production scrap and the coins themselves can be recycled in the usual way for bras~, p~ated coins.
3. Nlckel 99.2 with an 0.2% proof strcngdl of 120 N~rnrn~ to 150 M/r~ on ferritic chromium steel X2Crl I (Gerrnan Ma2en~1s Standart l .4003) w~th an 0.2% proof strength of 220 ~7/mm~ to 2S0 N/rnrn~ or X6Crl7 (Gerrnan Materials Standard 1.4016) with an 0.2% proof strength of 275 ~i/mrn2 to ~40 N/rnrn~. The plating is rolled on to the core to a thickness of 2 x 2.5%, 2 ~c 5%
or 2 x 10% nickel and the result~nt composite strip made into coins and tokens. The faccs and edges of the coins e~nnce no noteworthy Ji~re.~ce in corrosion .~;,l~r.~ c when used in the manner and for the purpose envisaged.
The edges and faces lre of virtuallr uniform coloùr. Both thc production scrap and the coins thc.~:,el~cs can be rccyclcd as alloy steel scrap with no difflculty.
With rcgard ~o suitabillty for coin testing d~ices, matenals 1 and 2 are not ferrom~gnetic whereas rT-ateris13 is. A plated coin with a carbon steel core is slways ferrom~gnetic. Selection can be m~de acco.Jingly.
~lle invention also allows wide scope for sclection of varjous kinds of relief and is especially well suited to 8 y~O;e ': g stalllp.
Convensional production procedures ar,d, to a larBe extent, conventional equipmes~t can ~e used. Acco. ~in,21~, the plating and punching out of the blanlcs is almost slways followed by ~he cold forming of a nlillcd edgc. The finished blaslks are then so~
~nne~ed and sent to the mint for stamping.
DEC I ' 94 1 1: 25 +49 21 1 9049049 PRGE .008
or 2 x 10% nickel and the result~nt composite strip made into coins and tokens. The faccs and edges of the coins e~nnce no noteworthy Ji~re.~ce in corrosion .~;,l~r.~ c when used in the manner and for the purpose envisaged.
The edges and faces lre of virtuallr uniform coloùr. Both thc production scrap and the coins thc.~:,el~cs can be rccyclcd as alloy steel scrap with no difflculty.
With rcgard ~o suitabillty for coin testing d~ices, matenals 1 and 2 are not ferrom~gnetic whereas rT-ateris13 is. A plated coin with a carbon steel core is slways ferrom~gnetic. Selection can be m~de acco.Jingly.
~lle invention also allows wide scope for sclection of varjous kinds of relief and is especially well suited to 8 y~O;e ': g stalllp.
Convensional production procedures ar,d, to a larBe extent, conventional equipmes~t can ~e used. Acco. ~in,21~, the plating and punching out of the blanlcs is almost slways followed by ~he cold forming of a nlillcd edgc. The finished blaslks are then so~
~nne~ed and sent to the mint for stamping.
DEC I ' 94 1 1: 25 +49 21 1 9049049 PRGE .008
Claims (7)
1. Plated coin consisting of a minimum 80 % by mass of chromium steel with a ferritic, austenitic or duplex structuxe wherein the core consists of soft or solution annealed stainless steel whose 0,2 % proof strength at room temperature is at least 220 N/mm2, plated on either side with non-ferrous metal whose 0,2 % proof strength is a minimum of 40 N/mm2 below the 0,2 % proof strength of the core.
2. Coin as in Claim 1 whose core consists of soft or solution annealed stainless steel whose 0,2 % proof strength is at least 220 N/mm2, plated on either side with non-ferrous metal whose 0,2 % proof strength is a minimum of 25 % below the 0,2 % proof strength of the core.
3. Coin as in Claim 1 or 2 with the following distinguishing features:
The stainless steel core is made up (in % by mass) as follows:
C ?0.03 Si ?2.0 Mn 0.5 to 1.5 P ?0.045 S ?0.030 N ?0.03 Cr 10.5 to 12.5 Ni 0.3 to 1 remainder iron and smelting impurities
The stainless steel core is made up (in % by mass) as follows:
C ?0.03 Si ?2.0 Mn 0.5 to 1.5 P ?0.045 S ?0.030 N ?0.03 Cr 10.5 to 12.5 Ni 0.3 to 1 remainder iron and smelting impurities
4. Coin as in Claim 1 to 3 with the following distinguishing features:
The core is plated with 2 non-ferrous alloy containing 60% to 100% by mass copper.
The core is plated with 2 non-ferrous alloy containing 60% to 100% by mass copper.
5. Coin as in Claim 4 with the following distinguishing features:
The core is plated with a copper alloy containing 1% to 2.5% by mass tin
The core is plated with a copper alloy containing 1% to 2.5% by mass tin
6. Coin as in Claim 4 or 5 with the following distinguishing features:
The core is plated with brass.
The core is plated with brass.
7. Process for the production of plated coins consisting of a minimum 80% by mass of chromium steel with a ferritic, austenitic or duplex structure with the following distinguighing features:
The blanks are punched out of rolled composite strip consisting of a stainless steel core plated on both sides and are sent for stamping without the edges being electroplated.
The blanks are punched out of rolled composite strip consisting of a stainless steel core plated on both sides and are sent for stamping without the edges being electroplated.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4341226.2 | 1993-12-03 | ||
| DE19934341226 DE4341226C1 (en) | 1993-12-03 | 1993-12-03 | Plated coin and process for its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2137096A1 true CA2137096A1 (en) | 1995-06-04 |
Family
ID=6504097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2137096 Abandoned CA2137096A1 (en) | 1993-12-03 | 1994-12-01 | Plated coin and a method of producing the same |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0656255A1 (en) |
| CA (1) | CA2137096A1 (en) |
| DE (1) | DE4341226C1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2143829A2 (en) | 2008-06-13 | 2010-01-13 | Monnaie Royale Canadienne/Royal | Control of electromagnetic signals of coins through multi-ply plating technology |
| US7842434B2 (en) | 2005-06-15 | 2010-11-30 | Ati Properties, Inc. | Interconnects for solid oxide fuel cells and ferritic stainless steels adapted for use with solid oxide fuel cells |
| US7981561B2 (en) | 2005-06-15 | 2011-07-19 | Ati Properties, Inc. | Interconnects for solid oxide fuel cells and ferritic stainless steels adapted for use with solid oxide fuel cells |
| US8158057B2 (en) | 2005-06-15 | 2012-04-17 | Ati Properties, Inc. | Interconnects for solid oxide fuel cells and ferritic stainless steels adapted for use with solid oxide fuel cells |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1021301C2 (en) | 2002-08-19 | 2004-03-01 | Konink Nl Munt N V | Method for manufacturing coins or tokens and coins or tokens thus obtained. |
| JP6535993B2 (en) * | 2014-08-12 | 2019-07-03 | セイコーエプソン株式会社 | Watchbands and watches |
| DE102015117459A1 (en) * | 2015-10-14 | 2017-04-20 | Reischauer Gmbh | Course coin and process for its production |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3750253A (en) * | 1971-10-29 | 1973-08-07 | Texas Instruments Inc | Coinage material |
| US4089753A (en) * | 1974-09-16 | 1978-05-16 | Sherritt Gordon Mines Limited | Process for the production of nickel clad steel coinage blank |
| US4292377A (en) * | 1980-01-25 | 1981-09-29 | The International Nickel Co., Inc. | Gold colored laminated composite material having magnetic properties |
| DE3817657A1 (en) * | 1988-05-25 | 1989-12-07 | Vdm Nickel Tech | LAYER COMPOSITE FOR THE PRODUCTION OF COINS |
-
1993
- 1993-12-03 DE DE19934341226 patent/DE4341226C1/en not_active Expired - Fee Related
-
1994
- 1994-11-29 EP EP94118743A patent/EP0656255A1/en not_active Withdrawn
- 1994-12-01 CA CA 2137096 patent/CA2137096A1/en not_active Abandoned
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7842434B2 (en) | 2005-06-15 | 2010-11-30 | Ati Properties, Inc. | Interconnects for solid oxide fuel cells and ferritic stainless steels adapted for use with solid oxide fuel cells |
| US7981561B2 (en) | 2005-06-15 | 2011-07-19 | Ati Properties, Inc. | Interconnects for solid oxide fuel cells and ferritic stainless steels adapted for use with solid oxide fuel cells |
| US8158057B2 (en) | 2005-06-15 | 2012-04-17 | Ati Properties, Inc. | Interconnects for solid oxide fuel cells and ferritic stainless steels adapted for use with solid oxide fuel cells |
| US8173328B2 (en) | 2005-06-15 | 2012-05-08 | Ati Properties, Inc. | Interconnects for solid oxide fuel cells and ferritic stainless steels adapted for use with solid oxide fuel cells |
| EP2143829A2 (en) | 2008-06-13 | 2010-01-13 | Monnaie Royale Canadienne/Royal | Control of electromagnetic signals of coins through multi-ply plating technology |
| US9447515B2 (en) | 2008-06-13 | 2016-09-20 | Royal Canadian Mint | Control of electromagnetic signals of coins through multi-ply plating technology |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0656255A1 (en) | 1995-06-07 |
| DE4341226C1 (en) | 1995-06-14 |
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