1、UDC 621.86.061.1 : 620.1 DEUTSCHE NORM December 1989 Lifting hooks Technical delivery conditions for forged hooks I 15404 Part 1 Lasthaken fur Hebezeuge; technische Lieferbedingungen fr geschmiedete Lasthaken Supersedes March 1979 edition. In keeping with current practice in standards published by t
2、he International Organization for Standardization (ISO), a comma has been used throughout as the decimal marker. This standard includes safety requirements within the meaning of the Gertesicherheitsgesetz (Equipment Safety Law). This standard has been prepared in cooperation with the Hauptverband de
3、r gewerblichen Berufsgenossenschaften e. V., Zen- traIsteIIe fr Unfallverhutung und Arbeitsmedizin (Federation of Industrial Employers Liability Insurance Associations, Central Office for Accident Prevention and Occupational Medicine), Bonn. Start of validity This standard is valid from 1 December 1
4、989. 1 Field of application This standard applies to forged hooks for use on lifting appli- ances. Such hooks include point hooks, ramshorn hooks, claws, shackles for laminated hooks, etc. It is recommended that laminated hooks of at least 20t capacity be used where service temperatures are very hig
5、h (e.g. for carrying molten materials). 2 Scope This standard specifies safety requirements intended to improve the reliability of forged hooks (hooks, for short) and describes the methods of test. 3 Requirements 3.1 Material Hook material shall comply with the specifications given in DIN 15400. Str
6、ength class M or P hooks (ci. DIN 15400) shall be made from fine grain steel complying with the basic series in DIN 17103 (cf. Amendments). The steels listed in DIN 17103 are insusceptible to ageing. Should service temperatures for hooks not conform to the range of temperatures given in DIN 17103, i
7、t may be agreed that, for temperatures over 25OoC, steels belonging to the high temperature series or, for temperatures below -2OoC, steels belonging to the low temperature series be used (also specified in DIN 17103). 3.2 Forging Hooks in the unmachined condition shall be produced to the dimensions
8、 specified in the relevant dimensional standards and comply with the technical delivery conditions given in DIN 7521. Where any production-related tolerances are not specified in the relevant standards, the dimensions of hook zones subject to wear shall meet or exceed the requirements regarding acce
9、ptable wear as described in subclause 5.3 of the March 1979 edition of DIN 15405 Part 1. Unmachined hook components shall be worked hot, such that the deformation ratio in the zone of largest cross section is equal to at least 3 : 1. 3.3 Heat treatment Afier being forged, hooks shall be heat treated
10、 in such a way that the required notched bar impact energy is attained. The heat treatment method used shall be stated on the inspection certificate (cf. clause 5). 3.4 Surface condition After heat treatment, hooks shall be descaled and shall not exhibit surface defects likely to affect safe usage.
11、3.5 Internal defects Hooks shall be free of internal defects likely to affect safe usage. 3.6 Additional requirements Welding shall not be carried out on any part of the hook. Excepted from this requirement are drop forged hooks for mass-produced lifting appliances, where the following shall be perm
12、itted: a) a welded joint between hookshankand lifting eye on No. 5 hooks or lower, belonging to groups 1 A, and 1 B, as in DIN 15400; b) a tackweld between shankend and nut to prevent twisting on No. 1 hooks, provided the load is accommodated by the thread and not by the weld. 3.7 Marking For the pu
13、rposes of demonstrating compliance with the specifications of this standard, that part of the hook indicated in DIN 15401 Part 1 or 2 or in DIN 15402 Part 1 or 2 shall be clearly and permanently marked with the following informa- tion: line 1 : the manufacturers mark; line 2: the symbol denoting str
14、ength class, followed by the lifting hook number, as outlined in DIN 15400; line 3: any marking required by the purchaser, with the item number attached if hooks are supplied as part of a batch, e.g. 367.1 (required only on hand forged hooks); line 4: the DIN symbol. The information for lines 1.2, a
15、nd 4 above need not be marked in separate lines on drop forged hooks. Continued on pages 2 to 4 uth Verlag GrnbH. Berlin. has the exclusive right of sale for German Standards (DIN-Normen). DIN 15404 Part 1 EnaI. Price arou0 12.90 - -, Sales No.0105 Page 2 DIN 15404 Part 1 4 Testing The characteristi
16、cs in clause 3 shall be tested in accordance with subclauses 4.1 to 4.5, and a certificate issued, using the specimen form on page 4 as a basis. 4.1 Chemical composition The chemical composition shall be established as specified in DIN 17103. The values of the actual chemical composition may be base
17、d on the cast analysis and be obtained from inspection certi- ficate B (defined in DIN 50049). submitted by the steel manu- facturer, provided the forging works confirms the correctness of the certificate. 4.2 Mechanical properties The mechanical properties shall be tested as described in DIN 17 103
18、, in conjunction with DIN 50 145 (tensile test) and DIN 50 115 (notched bar impact test). After the final heat treatment, the required number of speci- mens shall be taken from the heat treatment batch, in the lon- gitudinal direction, preferably from the outer third of the shank cross section. The
19、size of a batch of hooks up to No. 40 is that number of hooks which is made from the same raw material (cast, billet or cog) and which undergoes the same heat treatment, the maximum mass of a heat treatment batch being 3 t. For No. 50 hooks or higher, the set of specimens shall be taken from one hoo
20、k only. 4.3 Dimensional accuracy Acheck shall be made to establish that the actual dimensions of unmachined components and finished hooks lie within the limits of size specified, or that they comply with the require- ments given in subclause 3.2. Finished hooks which incorporate a nut shall be check
21、ed for: a) axial play in the thread; b) percentage contact area of the thread flank; c) surface quality (notch-free transition), especially that of the shank and thread; d) distance between the bearing face of the nut and the shoulder. 4.4 Surface finish A visual examination shall be made to check w
22、hether the hook is free of scale. All hooks shall be checked for surface defects, likely to affect safe usage, using a method that permits reliable detection of such. 4.5 Internal defects All hooks shall be checked for internal defects using a non- destructive method that permits reliable detection.
23、 If the ultrasonic method is used, the raw material shall be free of in- ternal defects before forging, which is to be checked and certified either by the steel manufacturer or at the forging works. 5 Certificates The purchaser of No. 20 hooks or higher (see DIN 15400for hook numbers) shall be suppl
24、ied with an inspection certi- ficate whose contents are in compliance with the specimen form on page 4.?) If agreed at the time of ordering, the pur- chaser of No. 16 hooks shall be supplied with such a certi- ficate. In either case, the manufacturer shall keep a copy of the certificate. The certifi
25、cates shall be filed by the user of the lifting appli- ance as part of the inspection log, if keeping such is request- ed by the responsible employers? liability insurance asso- ciation. The inspection certificate shall summarize all relevant data from the manufacturer of the raw material, from the
26、manu- facturer of forgings, and from the hook manufacturer. The individual certificates shall be filed with the issuing body. I) If a certificate of compliance with EC Commission Direc- tive No. 76/434 dated 13 April 1976 is required, the follow- ing information shall also be provided: a) a drawing
27、of the hook showing its principal dimensions: b) the maximum proof load to which the hook can be sub- jected without displaying a significant permanent set after unloading, which shall, in no case, result in an increase in the seat diameter of more than 0,250/0; c) the force at which the hook distor
28、ts so as to be inca- pable of retaining the load; d) the minimum breaking force, if the hook is designed so that it fractures or would fracture instead of distorting; e) the status of the signatory for the manufacturer or his duly appointed representative. DIN 15404 Part 1 Page 3 Standards and other
29、 documents referred to DIN 7521 Steel forgings; technical delivery conditions DIN 15400 Lifting hooks; mechanical properties, lifting capacity, stresses and materials DIN 15401 Part 1 Lifting hooks; point hooks; unmachined components DIN 15401 Part 2 Lifting hooks: finished point hooks with screwed
30、shank DIN 15402 Part 1 Lifting hooks; ramshorn hooks; unmachined components DIN 15402 Part 2 Lifting hooks; finished ramshorn hooks with screwed shank DIN 15405 Part 1 Lifting hooks; in-service inspection of forged lifting hooks DIN 17 103 Weldable fine grain steel forgings; technical delivery condi
31、tions DIN 50049 Materials testing certificates DIN 50 115 Testing of metallic materials; notched bar impact test DIN 50 145 Testing of metallic materials; tensile test EC Commission Directive No. 761434 to assimilate the legal and administrative regulations of member countries regarding the certific
32、ation and marking of wire ropes, chains and lifting hooks, dated 13 April 1976. M P Other relevant standards DIN 15 002 Lifting equipment; terminology DIN 15 O03 Lifting equipment; loads and forces; concepts DIN 15403 Lifting hooks: knuckle threads DIN 15404 Part 2 Lifting hooks; technical delivery
33、conditions for laminated hooks DIN 15405 Part 2 Lifting hooks; inspection of laminated hooks in service DIN 15407 Part 1 Laminated point hooks for spigot ladles; assembly and principal dimensions DIN 15407 Part 2 Laminated point hooks for spigot ladles; components DIN 15428 Lifting appliances; lifti
34、ng gear; technical delivery conditions DIN 15 429 Lifting appliances; lifting gear; in-service inspection A341 StE 285 ASt52 StE355 Previous editions DIN 15404 Part 1: 12.67, 03.79. Amendments The following amendments have been made to the March 1979 edition. a) DIN 17103 is now used as the referenc
35、e for specifying hook materials, following the withdrawal of DIN 17 135 (ci. table below). Comparison of steel grades Hook strength class as in DIN 15400 As specified in DIN 17135 As specified in DIN 17103 b) The standard has been editorially revised. International Patent Classification B 66 C 1/34
36、Page 4 The note in the margin on page 1 prohibiting reproduction of any part of the standard does not apply to the following form. DIN 15404 Part 1 Material number StE285 Desired StE355 values DIN 50049 - 3.1 B Inspection Certificate for forged hooks in compliance with DIN 15404 Part 1 loo 24 50,100
37、 150 ,375 150 5 100 5600 124 550 100 5150 5375 5600 5150 5600 390 to 510 370 to 510 285 265 245 225 205 24 22 39 490 to630 470 to630 355 335 315 295 275 23 21 39 (space for company logo) I Actual values I StE 285 StE 355 Hook marking Line 1 : Line 2: Line 3: Line 4: General: Purchaser: Manufacturer:
38、 Purchase order number: Manufacturers invoice number: Cast number: Type of hook (e.g. point hook complying with DIN 15401 Part 2): Hook number: Consecutive unit number: Method used: Batch size: Results: Free of surface defects likely to affect safe usage. Results of materials testing Material: compl
39、ying with DIN 15404 Part 1, subclause 3.1, Chemical composition determined in the cast analysis3). as a percentage by mass Tensile strength, R, in Nlmm2, for an equivalent diameter, in mm. of Mechanical properties 3, at ambient temperature Minimum upper yield strength, ReH, in Nimm2, for an equivale
40、nt diameter, in mm, of Minimum elongation Minimum impact after fracture energy, (Lo = 5do), A, in J as a percentage, (ISO-V) for an equivalent (at -20c2) diameter, in mm, of Heat treatment Normalizing at C for hours, accelerated cooling in and followed by stress relieving immediately aterwards at C.
41、 Check for dimensional accuracy All dimensions lie within the specified limit deviations. Check for surface defects Method used: I Results: Free of internal defects likely to affect safe usage. I Notes: Cast analysis *) Product analysis Place Date Miscellaneous: *) Delete as applicable. (Company stamp) Signature
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