Inst-362 Nitre Bluing Bluing

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  • NitreBlue Bluing is a controlled heating process that will colorvirtuallyallcarbonandtoolsteels.ThesameNitreBlueBluingSaltscanbeusedtodrawthetemperonsteelpartsthathavebeenhard-ened,suchasknifebladesandtools.Stainlesssteelbladesandtoolscanbedrawn,butwillnotcolorduetothecompositionofthesteel.Otherusesincludeheattreatingparts,especiallysprings,togetthepropercombinationofhardnessandtoughnesstodothejobrequiredofthem. Unlikeconventionalhotsaltsbluing,NitreBlueBluingcanproduceawiderangeofcolor,fromapaleyellowstrawcolor,toadeep,blackblue.Thefinalcolorofthepart isdeterminedbythefollowingfourfactors:1)ThetemperatureoftheNitreBlueBluingBath;2)ThetimethepartsareleftintheBluingBath;3)Thewaythemetalwaspre-paredandpolished;4)ThecompositionofthealloybeingNitreBlueBlued. Inrecenttimes, this finishhasbeenusedmainlybycustomgun makers and restoration shops to achieve a bright peacock,orfire blue finish onpins, screws, springs, sights, and small bluepartsnotnormallysubject toagreatdealofhandlingorwear.TheadvantageofNitreBlueBluingismorerepeatablefromparttopart,and there is littleornodangerof overheating thepartswhichcansoftenthempasttheminimumhardnessneededforthemtodotheirjob.And,unlikehome-brewednitrebluingbaths,NitreBlueBluingSaltsarespecificallyblendedforlowmeltingpoint,stabilitythrough-out the entire temperature working range and little possibility ofafter-rust.And,whatNitreBlueBluingBathisdraggedoutoftheBluingTankonthesurfaceofthepartsbeingbluediseasilyscrubbedoffinwarm-to-hotwater. NitreBlueBluingcanalsobeusedtocloselyapproximatethebluefinish used on Colt and Smith & Wesson revolvers of the 1850sthrough the 1930s, plus the similar finishes used by other gunmakers of that era.NitreBlueBluing can also be used to properlystrawcolorthetrigger,safetyandsafetybaronLugerPistolsduringres-toration. Usedaspartoftheoverallartisticrenderingofthegun,NitreBlue

    Bluingisveryeffective.Drawingonthestyleofcolorationofqual-ityoldriflesandguns,suchastheMannlicher-Schoenauers,youfindnitrebluedandstrawedparts.Usuallythesearetempercolorsonhardenedparts.But, the effect of asplash of color on these gunsisveryappealingandeffective.Springsareexcellentcandidatesforcoloring,aswellasexpressriflesightsandWin.M-94loadinggates.ANitreBluebluedpartalsolooksgreatnexttocolorcasehardenedorFrenchgrayedparts.

    The NitreBlue Bluing Procedure is very simple...1-Cleantheproperlypolishedgunandpartsincleaner/degreaser.2-Dryallpartsthoroughly.3-Withinamaximumof2hoursafterpolishing/cleaning,immersein

    moltenNitreBlueBluingBathuntilthedesiredcolorisachieved.Generally5minutesforsmallparts;10minutesforlargeones.

    4-Removeandquenchthepartsinatankofwater,oraircool.5-Rinseandscrubpartsinwarm-to-hotwatertoremoveresidue.6-ImmerseinWaterDisplacingOil.

    SETTING UP THE BLUING ROOM

    Considerthelocationofyourbluingroomcarefully,andbesurethelayoutisconvenientandefficient.Particularlyconsiderkeepingyourbluingroomseparate - or sealedoff from -yourgeneral shoparea.The reasons for this are: youmustkeeppeoplewhoarenot awareof the extremelyhigh temperaturesatwhich theNitreBlueBluingBathoperatescompletelyoutofthewayoftheseriousburnhazardsinvolved;youmusthaveproperandadequateventilationfortheblu-ingroom,andshouldbringinoutsideairandthenventitfromtheroom.And,finally, ifyoudowanttoaddOxynateNo.7Bluingtoyouroperation later,youwillnothavetodoextensiverelocatingoflights,ventsystemsandgaslinestosetitup.

    LIGHTING: Good, bright lighting is absolutely essential for bestresultswithNitreBlueBluing.Fluorescent lights are fine for roomillumination, however, you must have one good incandescent lightdirectlyovertheNitreBlueBluingTankbecauseyoudeterminetheactualcoloryouwantabluedparttobebyobservingtheworkpiece.

    076-200-362 R502 2002 BROWNELLS, INC. Page of 2

    NitreBlue Bluingby the Crew at Brownells

    INTRODUCTION

    Orders: 800-741-0015 Office: 641-623-5401Fax: 641 623 3896 www.brownells.com

    200 SOUTH FRONT STREETMONTEZUMA, IA 50171

    WARNINGUSE EXTREME CAUTION - YOU ARE WORKING WITH CHEMICALS HEATED TO 300 F.-900 F. READ AND FOLLOW ALL SAFETY PROCEDURES TO HELP PREVENT INJURY OR PROPERTY DAMAGE.

    DANGER - SPECIALCAUTION-READALLINSTRUCTIONSANDUNDERSTANDFULLYBEFOREPROCEEDING!NEVER immerse parts that have been Cyanide-bath hardened into NitreBlue Bluing Bath unless all traces of cyanide compounds areremoved.CONTACTwithorganicmaterialmaycauseafire.CONTACTwithacidsmayreleasetoxicfumes.NEVERallowwatertocontactmoltenNitreBlueBluingBath;dangeroussteamexplosionscanresult.NEVERimmersewetordamppartsinmoltenNitreBlueBluingBath;dangeroussteamexplosionscanresult.NEVERaddanychemicaloradditivestoNitreBlueBluingSaltsormoltenNitreBlueBluingBath.

    Danger: Oxidizer - Contains Sodium Nitrite, Sodium Nitrate and Potassium Nitrate. Avoid contact with eyes and skin. For eyes: Flush with water for 15 minutes. Consult physician immediately. For skin: Wash with soap and water. Do not take internally. If swallowed: Induce vomit-ing. Consult physician immediately. Use with adequate ventilation. Avoid vapors. If inhaled: Move to fresh air. Rinse mouth and nasal pas-sages with water. Avoid contact with Cyanides, wear face shield, heat resistant gloves and protective apron.

  • Adimlylitworkareawillmakeitextremelydifficult, ifnotimpos-sible,togetthefinalcoloryouwant.Therefore,youmusthavegood,brightlighting.

    TANK SETUP AND WORKING AREA:All tanks used for NitreBlueBluingshouldbewashedoutwithcleanshopsolventbeforetheirfirstuse.Makesurethetankiscleananddrybeforesettingitupontheheatsource.Important-Makesuretheworkareaiskeptcleanandfree fromany flammable items.Oils, solvents aerosols, etc., shouldnevercomeincontactwiththeheatsourceorthemoltenNitreBlueBluingBath.

    Ifpartsarenottobequenchedaftertheyreachthedesiredcolor,aheat-proof surfacemustbeprovided toplace themonwhile theycool.Alarge,shallowcookiesheetorabakingpanwithawirecool-ingrackontopofitisanidealplaceforpartstocool.Ifthepartsaretobequencedinwaterafterbluing,a212gallonmetalbucketworksextremelywell.

    EQUIPMENT REQUIRED FOR THE BLUING ROOM

    TANKS:Forsmallpartssuchaspinsandscrews,anew,unusedbulletcasterspotordipper-typeelectric casting furnace canbeused.Forsprings,sightsandlargerparts,werecommendBrownellsBlackIronQuarterTank,(6"x6"x10"long).ThistankisashortenedversionofBrownells StandardBlack IronBluingTank, and gives the bestcompromisebetweenheat-uptimeandquantity/sizeofworkthatcanbeNitreBluebluedatonetime.

    HEAT SOURCE: A heavy-duty electric hot plate, small gas burner,orcampingstoveusingeitherpropaneorliquidfuelcanbeusedtoheatasmallbulletcasterspot.(Note:Acampstovemaynotprovideenoughheat;agasburnerwillbebest.)ToheattheQuarterTankwerecommendagasringorotherburnersetupforeithernaturalgasor liquidpropane (LPorBottlegas), capableofat least15,000btuoutput,proportionedtofitunderthe6"x6"x10"tank.ThestandtoholdyourNitreBluebluing tankneeds tobebuiltaround theheatsource,andideally,willbeaboutwaisthigh(orcanbeshorterandputonametaltopped,heatproofbench.Weld14"rodsacrossthetopofthestandabout2inchesapart,tosupporttheBluingTank.Wefoundaheavy,rectangularbarbecuegrillandsomebricksworkwell,too.

    We recommendmounting the heat source on a steel plate about20" long that canbe centeredunder theNitreBlueTank,pulling itoutforlighting,benchcleanupandsoon.Setupyourheatsourcewiththeflameheightadjustedsothatthehottestpartoftheflamejusttouchesthebottomofthetank.YoumayfindthataheatdiffuserplatebetweenthegasflameandthebottomoftheBluingTankhelpsgivemoreevenheatdistribution.Asteelplateabout14"to38"thickandabout2"largerthantheoveralldimensionsoftheBluingTankisideal.(AnaluminumheatdiffuserofsimilardimensionscanbeusedforNitreBlueBluing.But, aluminumMUSTNOTbe used around,orwith,eitherOxynateNo.7 orOxynate84 ,hotcausticbluingsalts.Forthebestheattransfer,thebluetipoftheflameshouldcon-tactthebottomofthetankordiffuserplate.

    STIRRING TOOL:Apieceofmildsteel,flatbarstock,14"x1"x12"to18"long,groundorfiledononeendintoadull,chiselshapeisidealtostirtheNitreBlueBluingBathasitisheatingup.Also,theBluingBathshouldbestirredoccasionallyduringuse.NOTE:ItisvitalthattheBluingBathbestirredfrequentlyandthoroughlyduringheating.Failure to stir during heatingmay causemoltenNitreBlue BluingBathto"erupt"fromtheBluingTankwhentheBluingSaltsatthebottommeltwhilethetoplayerisstillsolid.StirringthoroughlywillhelppreventoverheatingtheBluingSaltsatthebottomofthetankandhelpcontrolthesepotentiallydangerouseruptions.

    THERMOMETER: Bluing thermometers designed to be used withOxynateNo. 7 and other usual hot bluing solutions do not havetherangenecessaryforNitreBlueBluing.WerecommendtheLT-225LeadBathandHeatTreatThermometer,whichhasarangeof200F.to1000F.Thisthermometermustbemountedinthecenterofthelongsideofthetank,withtheendofthetemperature-sensingquillabout1"fromthebottomofthetank.

    TWEEZERS: Heavy-duty, 12" long tweezers are recommended forremovingpins,screws,etc.,fromthepartsbasket.

    STAINLESS STEEL DIPPER: This is the ideal tool to safely addNitreBlueBluingSaltstotheBluingTank.ItisalsousedtoskimoffthepinkfoamthatrisestothesurfaceoftheBluingBathduringthe

    initialmeltingofnewNitreBlueBluingSalts.STAINLESS STEEL SCREEN WIRE AND BLACK IRON WIRE: Smallpartscanbesuspendedorheldbyindividualwires.Or,smallpartsbaskets may be made of stainless steel screen wire to hold thesesmallparts,pluspinsandscrews.Largerpartsshouldbesuspendedbypiecesofblackironwire.Also,useblackironwiretomakehandlesforthesmallpartsbaskets.

    QUENCH TANK:A tank or bucket large enough tohold the largestpartbeingblued,withatleasta212galloncapacity,isrequiredforawaterquenchafterthepartshaveachievedthedesiredcolor.SettheQuenchTankseveralfeetawayfromtheNitreBlueBluingTank-andwellbelowit-soanywaterwhichmightbesplashedfromtheQuenchTankwillnotfallintotheBluingTank.

    WORK LIGHT:A flexible armbench light, suchas theLuxoLS-1A,thatwillsafelyaccepta100wattbulb,shouldbepositionedbytheNitreBlueBluingTankandadjustedtoprovidelightinginto