1、UDC 069.295.018.252.2 DEUTSCHE NORM November 1990 Titan i um Chemical composition I 17850 Titan; chemische Zusammensetzung Supersedes March 1970 edition In keeping with current practice in standards published by the International Organization for Standardization (ISO), a comma has been used througho
2、ut as the decimal marker. 1 Field of application This standard specifies the chemical composition of semi-finished products made from titanium. See DIN 1737 Part 1 for filler metals for welding titanium. 2 Designation Titanium covered in this standard shall be designated using the material designati
3、ons or material numbers listed in table 1. Example: Titanium identified by symbol (material designation) Ti2 or material number 3.7035 shall be designated: Titanium DIN 17850 -Ti2 or Titanium DIN 17850 -3.7035 3 Chemical composition 3.1 Ladle analysis The chemical composition of titanium as determin
4、ed by ladle analysis shall be as given in table 1. 3.2 Product analysis The limit deviations in the product analysis from the limiting values specified for the ladle analysis are given in table 2. 4 Semi-finished products Table 3 correlates titanium semi-finished products to grades, those commercial
5、ly available being marked x and those manufactured on request only, marked (x). For specification of the properties of semi-finished products,see the standards referred to in the respective column head. 5 Chemical analysis The elements listed in tables 1 and 2 shall be determined quantitatively usin
6、g recognized methods.To permit comparison of the results with the limiting values given in this standard,each value obtained shall be given to the same decimal place as that of the limiting value, using the rounding rules described in DIN 1333 Part 2. Table 1. Chemical composition of titanium as det
7、ermined by ladle analysis designation I 2) For finished or semi-finished products less than 2 mm in thickness or diameter, a maximum hydrogen content of 0,015% is permitted. Continued on pages 2 and 3 !uth Verlag GmbH. Berlin. has the exclusive right of sale for German Standards (DIN-Normen). DIN 17
8、850 Eng/. Price group i.91 Sales No 0105 Page 2 DIN 17850 Element Table 2. Amounts by which the chemical composltion as determined by product analysis may deviate from the limiting values specified for ladle analysis I I I 3 Limit deviation for product analysis, as a percentage by mass Maximum limit
9、ing value as determined by ladle analysis, as a percentage by mass Hydrogen (H) I Iron (Fe) I 0,30 I + 0,05 I 0.01 3 + 0,002 I Oxygen (0) I 0,35 I + 0,03 I Plate Tube Strip; plate and sheet cut and sheet Material I I + 0,Ol I Nitrogen (N) I 0.05 I Rod I + 0,02 I 0,06 I I Carbon (C) Wire DIN 17863 X
10、X (x) (x) Forgings DIN 17864 X X X (XI number 3.7025 3.7035 3.7055 3.7065 designation Ti4 from strip Seamless Welded DIN 17860 DIN 17860 DIN 17861 DIN 17866 DIN 17862 X X X X X X X X X X (XI X X X X (XI (x) (XI - - Standards referred to DIN 1333 Part 2 Presentation of numerical data: rounding DIN 17
11、37 Part 1 DIN 17860 DIN 17861 DIN 17862 DIN 17863 Titanium wire DIN 17864 DIN 17 866 Filler metals for welding titanium and titanium-paladium alloys; chemical composition and technical delivery conditions Titanium and titanium alloy plate, sheet and strip: technical delivery conditions Seamless circ
12、ular titanium and titanium alloy tubes; technical delivery conditions (at present at the stage of draft) Titanium and titanium alloy rods: technical delivery conditions (at present at the stage of draft) Titanium and titanium alloy forgings (hammer forgings and drop forgings); technical delivery con
13、ditions Welded circular titanium and titanium alloy tubes: technical delivery conditions Other relevant standard DIN 17851 Titanium alloys: chemical composition Previous edition DIN 17 850: 03.70. Amendments The following amendments have been made to the March 1970 edition. a) The specifications for
14、the chemical composition as determined by ladle analysis have been brought into line with the state of the art. b) Amounts bywhich the chemical composition as determined by product analysis may deviate from the limiting valuesspec- ified for the ladle analysis have been included for the first time.
15、c) Symbols to designate the titanium grades (e.g.Til.Ti2) have been specified. d) The text has been editorially revised. e) Low alloy titanium alloys are now specified in DIN 17851 and titanium castings, in DIN 17865. DIN 17850 Seite 3 Explanatory notes The series of standards on titanium and titani
16、um alloys has been restructured.The chemical composition of these materials is now dealt with in DIN 17850 and DIN 17851. the technical delivery conditions for semi-finished products such as tube,plate. sheet and strip being given in DIN 17860 to DIN 17863, and DIN 17866. DIN 17865 now covers titani
17、um and titanium alloy castings and DIN 17864, forgings. It has been agreed to make the following amendments to DIN 17850 and DIN 17851. a) DIN 17850 covers unalloyed titanium only. Symbols have been introduced to identify the titanium grade, but these do not, unlike the designation of aluminium grad
18、es, indicate the level of purity. b) The scope of DIN 17851 has been extended to include ten further alloys,a distinction being made between low alloy and high alloy grades. c) In both standards, separate specifications have been given for the chemical composition as determined by ladle and by product analysis. International Patent Classification C 22 C 14/00 G O1 N 33/20
