1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED AUGUST 1985 BS S 152:1975 Incorporating Amendments Nos.1 and 2# and Corrigendum No.1 Specification for Chromiumcobalt molybdenum vanadiumniobium heat-resisting steel billets, bars, forgings and parts (consumable electrode remelted) (1 000 1 140 MPa) (Cr 10
2、.5, Co 6, Mo 0.8, V 0.2, Nb 0.3) ICS 49.025.10 BS S 152:1975 This British Standard, having been approved by the Aerospace Industry Standard Committee, was published under the authority of the Executive Board on 30 September 1975 BSI 7 May 2004 The following BSI references relate to the work on this
3、standard: Committee reference ACE/15 Draft for comment 73/32574 DC ISBN 0 580 08740 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ACE/15, Wrought and cast steels for aerospace, upon which the following bodies were rep
4、resented: Civil Aviation Authority Airworthiness Cast Metals Federation Confederation of British Metalforming Institute of Spring Technology MoD UK Defence Standardization Society of British Aerospace Companies Ltd. UK Steel Association Co Opted Member Summary of pages This document comprises a fron
5、t cover, an inside front cover, pages i and ii, pages 1 to 3 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 5183 September 1986 14820 24 February 2004 15155 Corrige
6、ndum No.1 7 May 2004 Change to 7.2.2BS S 152:1975 BSI 7 May 2004 i Contents Page Committees responsible Inside front cover 1 Inspection and testing procedure 1 2 Manufacture 1 3 Chemical composition 1 4 Surface dressing 1 5 Condition 2 6 Heat treatment 2 7 Mechanical properties 2ii blankBS S 152:197
7、5 BSI 7 May 2004 1 NOTE This specification compiles with AECMA Recommendation FE PM38. 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 printing or deep etching tests On
8、e 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 the latest issue of BS S 100, Annex B. 2 Manufacture The material shall be manufactured by one of the following processes: a) A
9、ir melted in an electric furnace and consumable electrode remelted. b) Vacuum induction melted and consumable electrode remelted. 3 Chemical composition The steel shall contain: 4 Surface dressing The material shall be overall dressed. Bars for machining delivered in the finally heat treated conditi
10、on Sections 1 and 3 Forging stock and billets and bars for subsequent working Sections 1 and 5 Forgings Sections 1 and 6 Parts finally heat treated after machining Sections 1 and 7 Element % min. max. Carbon 0.06 0.11 Silicon 0.10 0.70 Manganese 0.6 1.15 Phosphorus 0.028 Sulfur 0.020 Boron 0.004 0.0
11、12 Cobalt 5.0 7.0 Chromium 9.8 11.2 Molybdenum 0.5 1.0 Niobium 0.20 0.45 Nickel 0.20 0.80 Vanadium 0.10 0.35 Nitrogen 0.010 0.035BS S 152:1975 2 BSI 7 May 2004 5 Condition 5.1 The material shall be supplied in the appropriate condition stated below: 5.2 Parts shall be supplied finally heat treated.
12、6 Heat treatment 6.1 Softening treatment The material shall be softened by heating at a temperature of between 720 C and 760 C for 2 h, followed by cooling in air. 6.2 Final heat treatment 6.2.1 The material, parts and test samples shall be heat treated as follows: a) Hardening. Pre-heat to a temper
13、ature between of 650 C and 700 C and equalize. Heat at a temperature of 1 170 10 C, followed by quenching in oil. NOTE If agreed between the manufacture and the purchaser and stated on the order or method of manufacture, parts may be air cooled from the hardening temperature. b) First tempering. Hea
14、t at a temperature of 610 5 C for not less than 2 h, followed by cooling in air to room temperature. c) Second tempering. Heat uniformly at a temperature between of 620 C and 650 C for not less than 2 h, followed by cooling in air. 6.2.2 Where bars delivered in the finally heat treated condition hav
15、e been subjected to a cold straightening or cold rolling operation, they may be given a stress relieving treatment, which shall be sufficient to restore the proof stress. 7 Mechanical properties 7.1 Mechanical tests The mechanical properties obtained from test pieces shall be as follows: 7.1.1 Creep
16、 test (One test per cast at cast release stage.) 7.1.2 Tensile test at room temperature Note deleted Designation Form Condition of supply S152B Black bars for machining Finally heat treated S152D Bright bars for machining Finally heat treated before or after cold drawing or cold rolling or machining
17、 or grinding S152A Forging stock and billets and bars for subsequent working Softened S152C Forgings Softened and finally heat treated Temperature Stress Max. total plastic strain in 100 h CM P a% 550 325 0.15 0.2 % proof stress Tensile strength Elongation Reduction of area min. min. max. min. min.
18、MPa MPa MPa % % 880 1 000 1 140 12 40BS S 152:1975 BSI 7 May 2004 3 7.2 Hardness test 7.2.1 The hardness of material heat treated in accordance with 6.1 shall be not greater than 277 HB or 282 HV. 7.2.2 The hardness of material, parts and test samples heat treated in accordance with 6.2 shall be: 32
19、1 min./352 max. HB; or 340 min./370 max. HV.BS S 152:1975 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is
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