1、September 2007DEUTSCHE NORM English price group 8No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 23.040.10!$OEc“144
2、3464www.din.deDDIN 28181Welded steel tubes for tubular heat exchangers Dimensions and materialsGeschweite Stahlrohre fr Rohrbndel-Wrmeaustauscher Mae und WerkstoffeSupersedesDIN 28181:1985-08www.beuth.deIn case of doubt, the German-language original should be consulted as the authoritative text.Tran
3、slation by DIN-Sprachendienst.Document comprises 10 pagesDIN 28181:2007-09 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Dimensions, masses per unit length, and tolerances5 3.1 Outside diameters and wall thicknesses, masses per unit length.5 3.2 Lengths .5 3.3 Tolerances6 4 Material
4、s .8 5 Designation 9 6 Order details.9 Bibliography. 10 DIN 28181:2007-09 3 Foreword This standard has been developed by Technical Committee NA 012-00-01-02 UA Anbauteile of the Normen-ausschuss Chemischer Apparatebau (FNCA) (Process Engineering Standards Committee) of DIN. Amendments This standard
5、differs from DIN 28181:1985-08 as follows: a) The title of the standard has been changed. b) Examples of designations and orders have been modified. c) Steel grade St 37.0 (1.0254) has been deleted. d) Steel grade St 37.8 (1.0315) has been deleted and replaced by steel grade P235GH (1.0345). e) Stee
6、l grade 16Mo3 (1.5415) is now included. f) Steel grade TTSt 35 N (1.0356) has been deleted and replaced by steel grade P215NL (1.0451). g) The previous Table 7 giving maximum heights of the internal weld seam of tubes not subjected to subsequent cold drawing has been deleted. h) The standard has bee
7、n editorially revised. Previous editions DIN 28180: 1953-11, 1964-12 DIN 28181:1985-08 DIN 28181:2007-09 4 1 Scope This standard applies to straight plain-end welded tubes made from non-alloy, alloy and stainless steels intended for use in tubular heat exchangers, which are predominantly used in pro
8、cess engineering. This standard does not apply to steel tubes intended for exposure to flame. Technical delivery conditions shall be as specified in the standards listed in Table 8, with the exception of the dimensions and tolerances specified in Clause 3 of the present standard. NOTE The outside di
9、ameters, wall thicknesses, and masses per unit length specified here conform to International Standard ISO 6758:1980. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated re
10、ferences, the latest edition of the referenced document (including any amendments) applies. DIN EN 10204, Metallic products Types of inspection documents DIN EN 10217-2, Welded steel tubes for pressure purposes Technical delivery conditions Part 2: Electric welded non-alloy and alloy steel tubes wit
11、h specified elevated temperature properties DIN EN 10217-4, Welded steel tubes for pressure purposes Technical delivery conditions Part 4: Electric welded non-alloy steel tubes with specified low temperature properties DIN EN 10217-7, Welded steel tubes for pressure purposes Technical delivery condi
12、tions Part 7: Stainless steel tubes AD 2000-Merkblatt W 21), Austenitic and austenitic-ferritic steels AD 2000-Merkblatt W 41), Tubes made from non-alloy and alloy steels 1) Obtainable from: Beuth Verlag GmbH, 10772 Berlin (Street address: Burggrafenstrae 6, 10787 Berlin). DIN 28181:2007-09 5 3 Dime
13、nsions, masses per unit length, and tolerances 3.1 Outside diameters and wall thicknesses, masses per unit length Outside diameters and wall thicknesses of tubes shall be as specified in Tables 1 and 2. Table 1 Non-alloy and alloy steel tubes Dimensions in millimetres Wall thickness 1,2 1,6 2,0 2,6
14、3,2 Outside diameter Mass kg/m 16 0,44 0,57 0,69 20 0,73 0,89 1,12 25 0,92 1,13 1,44 1,72 30 1,12 1,38 1,76 2,11 38 1,78 2,27 2,75 Table 2 Austenitic stainless steel tubes Dimensions in millimetres Wall thickness 1,2 1,6 2,0 2,6 3,2 Outside diameter Mass kg/m 16 0,45 0,58 0,70 20 0,56 0,74 0,90 1,14
15、 25 0,94 1,15 1,46 1,75 30 1,14 1,40 1,79 2,14 38 1,46 1,81 2,30 2,79 3.2 Lengths The tube length shall be selected from the exact lengths specified in Table 3. Lengths printed in bold are preferred. Other lengths may be agreed at the time of ordering. DIN 28181:2007-09 6 Table 3 Tube lengths Dimens
16、ions in millimetres Tube lengths 500 750 1 000 1 500 2 000 2 500 3 000 4 000 5 000 6 000 8 000 3.3 Tolerances 3.3.1 Tolerances on outside diameter The tolerances specified for outside diameters take out-of-roundness into consideration. The tolerance classes for the outside diameter as in this standa
17、rd shall be specified at the time of ordering. Table 4 gives outside diameter tolerances for non-alloy and alloy steel tubes and Table 5 gives outside diameter tolerances for stainless steel tubes. DIN 28181:2007-09 7 Table 4 Tolerances on the outside diameter of non-alloy and alloy steel tubes Dime
18、nsions in millimetres Tolerance Outside diameter Tolerance class 1 Tolerance class 2 Tolerance class 3a16 0,12 20 25 30 0,08 0,15 38 0,15 0,20 0,50 aNot suitable for tube-to-tubesheet rolling. Table 5 Tolerances on the outside diameter of stainless steel tubes Dimensions in millimetres Tolerance Out
19、side diameter Tolerance class 1 Tolerance class 2a16 20 0,10 25 0,12 30 0,15 0,30 38 0,20 0,40 aNot suitable for tube-to-tubesheet rolling. 3.3.2 Tolerances on wall thickness The tolerances specified for wall thicknesses take eccentricity into consideration. Table 6 gives tolerances on wall thicknes
20、s, excluding the weld, for all types of tubes covered by this standard. Table 6 Tolerances on wall thickness Tolerances on wall thickness Tube outside diameter 2 mm 2 mm Tolerance class 1 Tolerance class 2 Tolerance class 3 0,20 mm 10 % External weld upsets are not permitted. The height of the inter
21、nal weld seam shall be not greater than 0,1 mm. Cold rolled tubes shall not have external or internal weld upsets. DIN 28181:2007-09 8 3.3.3 Tolerances on exact length Table 7 gives tolerances for the exact length of all types of tubes covered by this standard. Table 7 Tolerances on exact length Dim
22、ensions in millimetres Length Tolerance 5 000 50+ 5 000 10 000 100+ 10 000 to be agreed 3.3.4 Straightness Tubes shall appear straight to the eye. Particular requirements regarding straightness may be agreed. 3.3.5 Finish of tube ends Tube ends shall be square cut and be free from burrs. 4 Materials
23、 Welded steel tubes for tubular heat exchangers shall preferably be made from the steel grades listed in Table 8. Technical delivery conditions shall be as specified in the standards listed in Table 8, with the exception of the dimensions and tolerances specified in Clause 3 of the present standard.
24、 Table 8 Steel grades and technical delivery conditions Steel grade Group Steel name Materialnumber Technical delivery conditions P235GH 1.0345 16Mo3 1.5415 DIN EN 10217-2 Non-alloy and alloy steel tubes P215NL 1.0451 DIN EN 10217-4 Tolerance class 1 or 3 Test category 1 X5CrNi18-10 1.4301 X5CrNiMo1
25、7-12-2 1.4401 X6CrNiTi18-10 1.4541 Stainless steel tubes X6CrNiMoTi17-12-2 1.4571 DIN EN 10217-7 Tolerance class 1 or 2 Test category 2 Preferably delivery condition WCAa or WCRaaThe pickled condition shall be separately agreed. DIN 28181:2007-09 9 5 Designation The designation of tubes complying wi
26、th this standard shall include the following information in the order given: The term “Tube”; this standard number (DIN 28181); characteristic tube dimensions: outside diameter wall thickness exact length (see Table 3 for lengths); the tolerance class (see Tables 4 and 5); the DIN Standard giving th
27、e relevant technical delivery conditions (see Table 8), e.g. DIN EN 10217-2; the steel name or material number (see Table 8); the symbol for the delivery condition, for tubes as in DIN EN 10217-7 (see Table 8). EXAMPLE 1 Designation of a welded tube with an outside diameter of 25 mm, a wall thicknes
28、s of 2,0 mm and an exact length of 5 000 mm, tolerance class 1 (TK1), complying with the technical delivery conditions specified in DIN EN 10217-2, made of steel grade P235GH (material number 1.0345): Tube DIN 28181 25 2,0 5 000 TK1 DIN EN 10217-2 P235GH EXAMPLE 2 Designation of a welded tube with a
29、n outside diameter of 25 mm, a wall thickness of 2,0 mm and an exact length of 5 000 mm, tolerance class 1 (TK1), complying with the technical delivery conditions specified in DIN EN 10217-7, made of steel grade X6CrNiMoTi17-12-2 (material number 1.4571) and in delivery condition WCA: Tube DIN 28181
30、 25 2,0 5 000 TK1 DIN EN 10217-7 1.4571 WCA 6 Order details In addition to the standard designation as in Clause 5, each order shall always give the desired quantity (e.g. the number of units or total length to be supplied), for tubes as in DIN EN 10217-2 the test category, the inspection document a
31、s in DIN EN 10204 describing the type of material testing, and where applicable, any additional technical rules which may apply, such as the AD 2000-Merkbltter (AD 2000 Codes). Examples of an order: 2 000 units of Tube DIN 28181 25 2,0 5 000 TK1 DIN EN 10217-2 P235GH Test category 1 Inspection certi
32、ficate DIN EN 10204 3.1 AD 2000-Merkblatt W 4 or 2 000 units of Tube DIN 28181 25 2,0 5 000 TK1 DIN EN 10217-7 1.4571 WCA Test category 2 Inspection certificate DIN EN 10204 3.1 AD 2000-Merkblatt W 2 DIN 28181:2007-09 10 Bibliography DIN 28180, Seamless steel tubes for tubular heat exchangers Dimensions and materials DIN 28182, Tubular heat exchangers Tube pitches, diameter of bores in tube sheets, baffles and support plates ISO 6758:1980, Welded steel tubes for heat exchangers
