1、BRITISH STANDARD AEROSPACE SERIES BS 4S 106: 1976 (Superseding BS 3S 106) Incorporating Amendments Nos. 1 and 2 3% c h r o m i u m - molybdenum steel billets, bars, forgings and parts (930-1080 MPa: limiting ruling section 150 mm) (Suitable for nitriding) UDC 629.7:669.15 26 28:669.14.018.29 BS 4S 1
2、06:1976 This British Standard, having been prepared under the direction of the Aerospace Industry Standards Committee, was published under the authority of the Executive Board on 31 March 1976 BSI 8 October 2002 The following BSI references relate to the work on this standard: Committee reference AC
3、E/15 Draft for comment 74/74367 DC ISBN 0 580 08789 1 National foreword This publication has been prepared by Technical Committee ACE/15, Wrought and cast steels for aerospace, under the direction of the Aerospace Standards Policy Committee (ACE/15-). This publication does not purport to include all
4、 the necessary provisions of a contract. Users 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 1 and 2, an inside back cov
5、er and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date of issue Comments 3531 August 1981 Indicated by a sideline in the margin 13679 8 October 2002 Addition of 1.3BS 4S 106:1976 BSI 8 Oc
6、tober 2002 1 NOTE The specified chemical composition and heat treatment comply with AECMA Recommendation FE-PL47. 1 Inspection and testing procedure 1.1 General. This British Standard shall be used in conjunction with the relevant sections of the latest issue of BS S 100 as follows: 1.2 Sulfur print
7、ing or deep etching tests. One sample shall be taken from each ingot for sulfur printing or deep etching tests. 1.3 Ultrasonic examination. The material shall be ultrasonically tested in accordance with BS S 100, Annex B. 2 Manufacture The material shall be manufactured by an electric process. 3 Che
8、mical composition The steel shall contain: 4 Surface dressing The material shall be overall dressed. Bars for machining delivered in other than the finally heat treated condition (see 5.1)s e c t i o n s 1 a n d 2 Bars for machining delivered in the finally heat treated condition sections 1 and 3 Fo
9、rging stock and billets and bars for subsequent working sections 1 and 5 Forgings sections 1 and 6 Parts finally heat treated (and nitrided) after machining sections 1 and 7 Element % min. max. Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Tin 0.20 0.10 0.40 3.0 0.50 0.28 0.3
10、5 0.70 0.020 0.020 3.5 0.70 0.30 0.030BS 4S 106:1976 2 BSI 8 October 2002 5 Condition 5.1 Unless otherwise required by the order, the material shall be supplied in the appropriate condition stated below: 5.2 Parts shall be supplied finally heat treated and, if appropriate, stabilized and nitrided. 6
11、 Heat treatment 6.1 Softening treatment. The softening treatment shall consist of heating uniformly, at a temperature of not less than 700 C. 6.2 Final heat treatment 6.2.1 The final heat treatment shall consist of the following: a) Hardening. Heat at a temperature of 900 10 C, followed by cooling i
12、n oil. b) Tempering. Heat uniformly at temperature of not less than 570 C, followed by cooling in air. 6.2.2 Hardened and tempered bars which have been subjected to a cold straightening or cold rolling operation shall be given a stress-relieving treatment, which shall be sufficient to restore the pr
13、oof stress. 6.3 Stabilizing treatment. The stabilizing treatment, if any, shall consist of heating at a temperature of not less than 510 C nor more than the tempering temperature. 6.4 Blank nitriding treatment. The blank nitriding treatment of the additional impact test samples shall consist of heat
14、ing at a temperature of 500 10 C for not less than 24 h. 7 Mechanical properties 7.1 Tensile test at room temperature and impact test. The mechanical properties obtained from test pieces shall be as follows: 7.2 Hardness test 7.2.1 The hardness of material heat treated in accordance with 6.1 shall b
15、e not greater than 269 HB. 7.2.2 The hardness of material, parts and test samples heat treated in accordance with 6.2 shall be: 269 min./321 max. HB or 285 min./340 max. HV Designation Form Condition of supply S106B Black bars for machining Finally heat treated S106D Bright bars for machining Finall
16、y heat treated before or after cold drawing or cold rolling or machining or grinding S106A Forging stock and billets and bars for subsequent working Softened S106C Forgings Finally heat treated 0.2 % proof stress Tensile strength Elongation Izod impact min. min. max. min. min. MPa (= N/mm 2 ) MPa (=
17、 N/mm 2 ) MPa (= N/mm 2 ) %f t l b f 740 930 1 080 13 35 NOTE Information on SI units is given in BS 3763 “The International System of units (SI)”, and BS 350 “Conversion factors and tables”.blankBS 4S 106:1976 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the ind
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