DIN_11850-1999
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UDC 621.643.2-034 TSCHE NORM July 1985 14.018.8:663/664stainless steel pipes DINfor the food industry 11850dimensions , materialssupersedes11.76.editionDimensions in mm1.Field of applicationThis standard shall apply to dimensions ,material ,internal and external surface quality and marking of seamless and welded stainless steel pipes for pipeline systems in the food industry .It shall apply in conjunction with 17456 to seamless pipes and DIN 17455 to welded pipes .2.DimensionThe dimension and permissible deviations of the pipes are listed in Table 1Table 1Series tolerance Nominaldiameter DN1 2 3 OD.dev Wall thickness.devWeightKg/m(7.97kg/dm3)remark 12 ±0.12 1.0 ±10% 0.2713±0.3 1.5 ±10% 0.431014±0.3 2.0 ±10% 0.6018 ±0.12 1.0 ±10% 0.4219±0.3 1.5 ±10% 0.66 1520±0.3 2.0 ±10% 0.9022 ±0.12 1.0 ±10% 0.5123±0.3 1.5 ±10% 0.81 2024±0.3 2.0 ±10% 1.1028 ±0.15 1.0 ±10% 0.6629±1% 1.5 ±10% 1.03 2530±0.3 2.0 ±10% 1.4034 ±0.15 1.0 ±10% 0.8235±1% 1.5 ±10% 1.26 3236±1% 2.0 ±10% 1.7040 ±0.2 1.0 ±10% 0.9741±1% 1.5 ±10% 1.50 4042±1% 2.0 ±10% 2.0052 ±0.2 1.0 C10% 1.2653±1% 1.5 ±10% 1.90 5054±1% 2.0 ±10% 2.60 65 70 ±0.3 2.0 ±10% 3.43 80 85 ±0.3 2.0 ±10% 4.16 100 104±0.3 2.0 ±10% 5.03 125 129±0.4 2.0 ±10% 6.36 150 154±0.4 2.0 ±10% 7.49Pipes with greater wall thicknesses than according to series 1 shall be selected from existing pipe standards for this nominal diameter rangeThe permissible deviations shall bedetermined from thecircumference.the permissible ovality shall be ±1% on the pipe outside diameterAssociated pipe unionSeries 1 : for rolling (up to DN 100 ) and butt welding Series 2 and series 3 : for butt welding3.designation and order3.1details shall be specified in the following sequence in the designationfor pipes according to this standard:_ Name ( pipe )_ DIN number of this dimension standard ( DIN11850 )_ Characteristic dimensions of the pipe . pipe outside diameter x wall thickness ( see Table 1 )_ DIN number of the technical specification ( welded pipes DIN17455 , seamless pipes DIN 17456 )_ Material number for the steel grade_ Abbreviation for the surface quality (see Table 2 )Example :Designation of a welded pipe according to this standard with a pipe outside of 40 mm and a wall thickness of 1 mm conforming to the technical specifications according to DIN 17455 made of steel ( material number 1.4301 ) surface quality finish BB:Pipe DIN 11850-40×1DIN 17455-1.4301-BB3.2 In addition to the standard designation according to paragraph 3.1 the required quality ( e.g. total length of the delivery ) shall be specified in the order.When ordering the following shall be specified separately:fixed lengthexact lengthcertificates relating to material testsaccording to DIN 50049Example of order:1000 m pipe DIN 11850-40×1DIN17455-1.4301-BBIn fixed length of 6 mCertificate DIN 50046-3.1B4 . MaterialThe following steel grade according to DIN 17455 and DIN 17456 can be used :a)standard materials :X5CrNi1810 –material number 1.4301X6CrNiMoTi17122-material number 1.4571b)further materials :X6CrNiMo17122 -material number 1.4401X2CrNiMo18143 -material number 1.4435X6CrNiTi1810-material number 1.45415 internal and external surface qualityTable 2Production method Heat treatmentcondition 1)Surface qualityAbbrevia-tion forthe finishMetallically brightconforming to finishh or m according toDIN 17456AAmetallicallybrightmeanroughnessvalueRa=2.5µmGround according tograin size 400 orpolishedABconforming to finishh or m according toDIN 17456ACSeamlessaccording to 17456(technical specifications)Heat treatedmetallicallybrightmeanroughnessvalueRa=1.6µmGround according tograin size 400 orpolishedAD heat treatedMetallically brightconforming to finishK2or K3 accordingto DIN 17455BA not heat treatedMetallically brightconforming to finishK0 andK1 accordingto DIN 17455CAheat treated BB not heat treatedmetallicallybrightfrom nominaldiameterDN25 weldleveled to wallthickness andsmoothedmeanroughnessRa=2.5µm weldarea excludedGround according tograin size 400 orpolishedCBheat treatedMetallically brightconforming to finishK2K3,I1orI2according to DIN 17455BC not heat treatedMetallically brightconforming to finishK0 andK1 accordingto DIN 17455CCheat treated BDW elded accordingto DIN 17455(Technicalspecifications)not heat treated metallicallybrightmeanroughnessRa=0.8µmweld areaRa=1.6µmGround according tograin size 400 orpolishedCD1)insofar as pipes are envisaged for further processing by shaping (e . g . bending),preferably pipes in the heat treated condition shall be ordered.2)pickled surfaces with finishes h according to DIN 17456,K1,K2 or I1 according to DIN6 MarkingThe pipes shall be marking according to the provisions of the technical specifications DIN 17456 or DIN 17455 with :_ manufacture mark_ steel grade ( material number )_ surface quality mark ( see Table 2 )Information concerning usePipes according to this standard can be used up to the permissible operating overpressures according to DIN 2413 , July 1972 edition , fieldof application Ⅰunder a static load at room temperatureTable 3DN 10 15 20 25 32 40 50 65 80 100125150 Permissible operating overpressures in bar for pipesSeries 1 16010585 65 55 45 35 55 45 35 30 25 Series 2 22015013510080 70 50－－－－－Series 3 27519016012510590 70 －－－－－The permissible operating overpressures were calculated for welded pipes with calculation value of steel grade 1.4301 taking into account utilizationof the permissible calculation stress of 80% in the weldQuoted standardsDIN 2413 Steel pipes ; calculation of the wall thickness to withstand internal pressureDIN17455 Welded circular stainless steel pipes for generalrequirements ; technical specificationsDIN17456 Seamless circular stainless steel pipes for generalrequirements ; technical specificationsDIN50049 Material test certificatesPrevious editionsDIN LAND 850 =DIN 11850 : 10.36 , 12.53x , 09.63 , 11.76 AmendmentsCompared to the November 1976 edition the following amendments have been made :a)For pipes with wall thickness in series 2 dimensions amendedand series 3 newly includedb)Reference to standards for thick-walled pipes with nominaldiameters DN65 to DN150 removedc)Steel grade 1.4541 and 1.4571 includedd)Designation and ordering based on DIN17455 and DIN17456e)Internal and external surface quality newly classified and newlyspecifiedf)Reference to use includedInternational patent classificationF 16 L 9 /02。
