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1、BRITISH STANDARD AEROSPACE SERIES BS S 526:1969 (Superseding in part BS S 521) Incorporating Amendments Nos. 1 and 2 Specification for softened 18/10 chromium-nickel corrosion-resisting steel sheet and strip (titanium stabilized: 540 MPa) UDC 629.7:669.152624295 194:669.14.018.8 41 ? BS S 526:1969 T
2、his British Standard, having been approved by the Aerospace Industry Standards Committee was published under the authority of the Executive Board of the Institution on 30 May 1969 BSI 27 May 2003 The following BSI references relate to the work on this standard: Committee reference ACE/15 Draft for c
3、omment 68/19874 ISBN 0 580 05389 X Amendments issued since publication Amd. No.DateComments 4254April 1983 1415127 May 2003Indicated by a sideline BS S 526:1969 BSI 27 May 2003 i Contents Page Forewordii 1Inspection and testing procedure1 2Process of manufacture1 3Chemical composition1 4Surface dres
4、sing1 5Condition1 6Final heat treatment1 7Mechanical properties2 8Intercrystalline corrosion test2 BS S 526:1969 ii BSI 27 May 2003 Foreword This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a B
5、ritish 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 and ii, pages 1 and 2, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the docum
6、ent was last issued. Sidelining in this document indicates the most recent changes by amendment. BS S 526:1969 BSI 27 May 2003 1 NOTE 1Sheet and strip of the same composition for use in the cold rolled condition are covered by the latest edition of BS S 524. NOTE 2Filler rods that comply with BS 145
7、3 Grade A8, for gas welding, or with BS 2901 Grade A8, for inert-gas arc welding, are suitable for welding steel of this composition. 1 Inspecting and testing procedure 1.1 This British Standard shall be used in conjunction with the relevant sections of the latest edition of BS S 500. 1.2 The thickn
8、ess of the material shall be in accordance with the latest edition of BS S 500. Material which has been finally hot rolled prior to softening shall satisfy the tolerances applicable to hot-rolled sheet and strip. Material which has been finally cold rolled prior to softening shall satisfy the tolera
9、nces applicable to cold-rolled sheet and strip. 1.3 Sulphur printing or deep etching tests. Samples shall be selected in accordance with the latest edition of BS S 500. 2 Process of manufacture The material shall be manufactured by an electric process unless otherwise agreed between the manufacturer
10、 and the purchaser in accordance with the latest edition of BS S 500. 3 Chemical composition The steel shall contain: 4 Surface dressing The material shall be overall dressed in accordance with the requirements of the latest edition of BS S 500. 5 Condition The material shall be supplied in the soft
11、ened condition. 6 Final heat treatment Softening shall be carried out by heating at a temperature between 1 000 C and 1 100 C and cooling, in air or quenching in oil or water. Element% min.max. Carbon0.08 Silicon0.21.0 Manganese0.52.0 Phosphorus0.035 Sulphur0.025 Chromium17.019.0 Molybdenum1.0 Nicke
12、l9.011.0 Titanium5 carbon content0.70 BS S 526:1969 2 BSI 27 May 2003 7 Mechanical properties The mechanical properties obtained from test pieces selected and prepared in accordance with the relevant requirements of the latest edition of BS S 500 shall comply with the following. 1) Tensile test. 2)
13、Hardness test. The hardness of the material shall be not more than 179 HB or 190 HV. 3) Single bend test. The test piece shall be bent cold without cracking through an angle of 180 and closed flat. 8 Intercrystalline corrosion test 8.1 A bend test piece shall be selected by the inspector to represen
14、t each batch. The test piece shall be heated for 30 minutes at a temperature of 650 10 C and cooled in air. It shall then be immersed for 72 hours in a boiling solution having the following composition: 111 grammes copper sulphate crystals (CuSO45H2O); 98 grammes concentrated sulphuric acid (specifi
15、c gravity 1.84) made up to 1 litre with distilled water. Precautions shall be taken during boiling to prevent concentration due to evaporation. 8.2 The test piece treated in accordance with 8.1 shall then be subjected to, and meet the requirements of, the single bend test in accordance with Clause 7
16、, 3). 8.3 Re-tests 8.3.1 If any test piece fails to meet the requirements of 8.2 the inspector shall select two further test pieces from the batch, one of which shall be taken from the item originally sampled, unless that item has been withdrawn by the manufacturer. 8.3.2 Both these further test pie
17、ces, selected in accordance with 8.3.1, shall be treated in accordance with 8.1 and tested in accordance with, and meet the requirements, of 8.2. 0.2 % proof stressTensile strengthElongation on thickness less than 1.5 mm1.5 to 3.0 mmover 3.0 mm MPaMPa% min.min.min.min.min. 210540303540 blank BS S 52
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