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1、BRITISH STANDARD AEROSPACE SERIES CONFIRMED MAY 1993 BS HR 51: 1973 Incorporating Amendment Nos. 1 and 2 Specification for Heat-resisting alloy billets, bars, forgings and parts (Solution treated at 980 C) (Ni 25.5, Cr 14.7, Ti 2, Mn 1.5, Mo 1.2, Si 0.7, V 0.3, Fe remainder) UDC 629.7:669.144:669:14
2、.018.4 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:55:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS HR 51:1973 This British Standard, having been approved by the Aerospace Industry Standards Committee, was published under the authority of the Executive
3、 Board on 28 September 1973 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference ACE/48 Draft for comment 72/32167 DC ISBN 0 580 07883 3 A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards
4、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 and ii, pages 1 and 2 and a back cover. This standard has been updated (
5、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 issueComments 1806September 1975 3488January 1981Indicated by a sideline in the margin Licensed Copy: London Sout
6、h Bank University, London South Bank University, Sat Dec 09 02:55:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS HR 51:1973 BSI 01-2000i Contents Page 1Inspection and testing procedure1 2Manufacture1 3Chemical composition1 4Condition1 5Heat treatment1 6Mechanical properties1 7Grain size2 Licensed
7、Copy: London South Bank University, London South Bank University, Sat Dec 09 02:55:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:55:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS HR 51:1973 BSI 01-200
8、01 NOTE 1This specification complies with AICMA Recommendation FE-PA92-HT for material heat treated to a tensile strength of 900 N/mm2 minimum. NOTE 2Other forms of this alloy are covered by British Standard: BS HR 650, Bolt material. 1 Inspection and testing procedure This British Standard shall be
9、 used in conjunction with the relevant sections of the latest issue of BS HR 100 as follows: 2 Manufacture The material shall be manufactured by one of the following processes: 1) air melting; 2) vacuum melting; 3) air melting and vacuum refining; 4) consumable electrode remelting. 3 Chemical compos
10、ition The alloy shall contain: 4 Condition 4.1 Unless otherwise agreed, the material shall be supplied in the appropriate condition stated below: 5 Heat treatment 5.1 Solution treatment. The material shall be heated at a temperature of 980 10 C for not less than 1 h, followed by quenching in oil or
11、water. 5.2 Precipitation treatment. The material shall be heated at a temperature of 720 10 C for not less than 16 h, followed by cooling in air. 6 Mechanical properties 6.1 Mechanical tests. The mechanical properties obtained from test pieces selected, prepared and tested in accordance with the rel
12、evant requirements of HR 100 shall be as follows: 6.1.1 Room temperature tensile test Bars for machining and extruded sections Sections 1 and 2 Forging stock and billets and bars for subsequent working Sections 1 and 3 ForgingsSections 1 and 4 Parts finally heat treated after machining Sections 1 an
13、d 8 Element% min.max. Carbon0.08 Silicon1.0 Manganese2.0 Phosphorus0.020 Sulphur0.015 Aluminium0.35 Boron0.00300.010 Chromium13.516.0 Molybdenum1.01.5 Nickel24.027.0 Lead0.0050 (50 p.p.m.) Titanium1.92.3 Vanadium0.100.50 IronRemainder MaterialCondition of supply Bars for machining Solution treated a
14、nd precipitation treated Billets and bars for forging Hot or cold worked and subsequently machined or ground. Material of other than round section may be supplied in the descaled condition ForgingsSolution treated and precipitation treated Finished parts Solution treated and precipitation treated 0.
15、2 % proof stress Tensile strength Elongation Reduction of area N/mm2N/mm2% min.min.min.min. 5909001320 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:55:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS HR 51:1973 2 BSI 01-2000 6.1.2 Stress rupture test. This
16、 test shall be carried out on a combined notched and unnotched test piece or on separate notched and unnotched test pieces. If a combined test piece is used, rupture shall occur in the unnotched portion. If separate test pieces are used, the time to rupture of the notched test piece shall exceed tha
17、t of the unnotched test piece. 6.2 Hardness 6.2.1 The hardness of material solution treated in accordance with 5.1 shall be not greater than 201 HB or 210 HV. 6.2.2 The hardness of finished parts and test samples finally heat treated in accordance with 5.1 and 5.2 shall be: 248 min./341 max. HB or 2
18、60 min./360 max. HV 7 Grain size 7.1 One sample shall be selected from each batch of bars for machining and from each batch of forgings, heat treated in accordance with 5.1 and 5.2, for grain size examination. 7.2 The samples shall exhibit a uniform average grain size as follow, or finer: Temperatur
19、eStressTime to rupture Elongation at rupture CN/mm2h% min.min. 650480234.5a a Where rupture occurs in more than 48 h, the elongation shall be not less than 2.5 %. NOTE 1N/mm2 = 1 MN/m2 = 1 MPa. Information on SI units is given in BS 3763, “The International System of units (SI)”; see also BS 350, “C
20、onversion factors and tables” and PD 5686 “The use of SI units”. Diameter or minor sectional dimensionGrain size mmmm Up to and including 1000.127 Over 1000.254 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:55:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI b
21、lank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 02:55:23 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS HR 51: 1973 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing Brit
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