BS S 158-1977 Specification for 1% chromium-molybdenum steel bars for the manufacture of forged bolts and forged nuts《锻制螺栓和螺母的含1%铬-钼钢棒规范》.pdf

1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED AUGUST 1985 BS S 158: 1977 Specification for 1% chromium- molybdenum steel bars forthe manufacture of forged bolts and forged nuts UDC 629.7:621.882:669.152628:669.14.018.26BSS158:1977 This British Standard, having been prepared under the directionof the A

2、erospace Standards Committee, was published under the authority ofthe Executive Board on 31May1977 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/15 Draft for comment 76/73898 DC ISBN 0 580 09813 0 A British Standard does not purport to include

3、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 document comprises a front cover, an inside front cover, pages i a

4、nd ii, page 1 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 Amd. No. Date of issue CommentsBSS158:1977 BSI 01-2000 i Contents

5、 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 1ii blankBSS158:1977 BSI 01-2000 1 NOTEThe requirements for the finished bolts and nuts are given in the relevant specifica

6、tions 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 conjunction with sections1 and9 of the latest issue of BSS100. 1.2 Sulphur printing or deep etching tests. One sample shall be taken

7、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 shall be manufactured by an electric process. 3 Chemical composition The steel shall contain: 4 Surface dressing The material shall

8、 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 Bar in coil. Bar delivered in coil shall be supplied spheroidized, cold drawn and suitably coated for cold forging. 6 Heat treatm

9、ent 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 at a temperature of870 10 C, followed by cooling in oil. b) Tempering. Heat uniformly at a temperature between450 C and660 C,

10、followed by cooling in air. 7 Mechanical properties 7.1 Hardening test. The hardness shall be not less than500HV. 7.2 Tests in the condition of supply. Material delivered in the condition specified in5.1 or5.2, as appropriate, shall comply with the following requirements. 8 Grain size The grain size

11、 shall be determined in accordance with BS4490 “Method for the determination of the austenitic grain size of steel”, method3 or method5. The grain size shall be no.5 or finer and no grain shall be coarser than no.3. Element % min. max. Carbon 0.22 0.29 Silicon 0.15 0.35 Manganese 0.50 0.80 Phosphoru

12、s 0.020 Sulphur 0.015 Chromium 0.9 1.2 Molybdenum 0.15 0.25 Nickel 0.30 Bar in straight lengths Bar in coil Tensile strength (max.) (MPa) 750 650 or Hardness (max.) 217 HB NOTEMPa = N/mm 2 . Information on SI units is given inBS3763 “The International System of units (SI)” and BS350 “Conversion fact

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