1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED AUGUST 1985 BS2S 147:1976 (Superseding BSS147) Incorporating Amendment No. 1 Specification for 0.5% nickel-chromium- molybdenum steel bars for the manufacture of forged bolts and forged nuts UDC 629.7:669.15242628 194 422:621.882.2/.3BS2S147:1976 This Brit
2、ish Standard, having been prepared under the directionof the Aerospace Standards Committee, was published under the authority ofthe Executive Board on 30November 1976 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/15 Draft for comment 75/74998DC
3、 ISBN 0 580 09500 2 A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This
4、 document comprises a front cover, an inside front cover, pages i and ii, page1 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication
5、 Amd. No. Date of issue Comments 6836 November 1971 Indicated by a sideline in the marginBS2S147:1976 BSI 01-2000 i Contents Page 1 Inspection and testing procedure 1 2 Manufacture 1 3 Chemical composition 1 4 Surface dressing 1 5 Condition 1 6 Heat treatment 1 7 Mechanical properties 1 8 Grain size
6、 1ii blankBS2S147:1976 BSI 01-2000 1 NOTEThe requirements for the finished bolts and nuts are given in the relevant specifications for those products, such as those in the “A” series of British Standards. 1 Inspection and testing procedure 1.1 General. This British Standard shall be used in conjunct
7、ion with sections 1 and 9 of the latest issue of BSS100. 1.2 Sulphur printing or deep etching tests. One sample shall be taken from each ingot for sulphur printing or deep etching tests. 1.3 Ultrasonic examination. Billets shall be subjected to ultrasonic examination. 2 Manufacture The material shal
8、l be manufactured by an electric process. 3 Chemical composition The steel shall contain: 4 Surface dressing The material shall be overall dressed. 5 Condition 5.1 Bar in straight lengths. Bar delivered in straight lengths shall be supplied annealed and either cold drawn or centreless ground. 5.2 Ba
9、r in coil. Bar delivered in coil shall be supplied spheroidized, cold drawn and suitably coated for cold forging. 6 Heat treatment The final heat treatment applicable to bolts and nuts made from this material and to their representative test samples shall consist of the following: a) Hardening. Heat
10、 at a temperature of840 C to870 C, followed by cooling in oil. The tolerance on the chosen temperature shall be 10 C. b) Tempering. Heat uniformly at a temperature between450 C and 660 C, followed by cooling in air. 7 Mechanical properties 7.1 Hardening test. The hardness shall be not less than 500H
11、V. 7.2 Tests in the condition of supply. Material delivered in the condition specified in 5.1 or 5.2, as appropriate, shall comply with the following requirements. NOTEMPa = N/mm 2 . Information on SI units is given in BS3763 “The International System of units (SI)” and BS350“Conversion factors and
12、tables”. 8 Grain size The grain size shall be determined in accordance with BS 4490 “Methods for the determination of the austenitic grain size of steel”, method 3 or method 5. The grain size shall be no. 5 or finer and no grain shall be coarser than no. 3. Element % min. max. Carbon 0.38 0.43 Silic
13、on 0.20 0.35 Manganese 0.75 1.00 Phosphorus 0.025 Sulphur 0.020 Chromium 0.40 0.60 Molybdenum 0.20 0.30 Nickel 0.40 0.70 Bar in straight lengths Bar in coil Tensile strength (max.) (MPa) 770 680 or Hardness (max.) 229 HB BS 2S 147:1976 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInst
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