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Bs 2s 98

Descripción: bs std




   I    S    B    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    0    1   :    9    0    9    0    0    2    /    3    0    /    5    0  ,   s   c    i    t   u   a   n   o   r   e    A   n   a    t   s   u    d   n    i    H  ,   n   a   n    h   s    i   r    k   a    l   a   p   o    G   a   n   a    j   n   a    K  .   s   r    M   :   y   p   o    C    d   e   s   n   e   c    i    L BS 2S 98: 1964 BRITISH STANDARD OBSOLESCENT FEBRUARY 1999 Specification for aircraft material 2; per cent nickel-chromiummolybdenum steel (high carbon) — (75/85 tonf/sq in: limited ruling section 6 in) UDC 629.13:669.15’24’26’28-196 629.13:669.15’24’26’28-196 (Replacing BS S 98) Incorporating   Amendment Nos. 1 and 2     I    S    B BS 2S 98:1964    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    0    1   :    9    0    9    0    0    2    /    3    0    /    5    0  ,   s   c    i    t   u   a   n   o   r   e    A   n   a    t   s   u    d   n    i    H  ,   n   a   n    h   s    i   r    k   a    l   a   p This British Standard, having   o been approved by the Aircraft    G Industry Standards Committee   a and endorsed by the Chairman   n of the Engineering Divisional   a Council, was published under    j authority of the General   n the Council of the Institution on   a 31 January 1964    K  . © BSI 02-2000   s   r    M The following BSI references   : relate to the work on this   y standard:   p Committee reference ACE/15   o    C Draft for comment D62/3645    d   e ISBN 0 580 34465 7   s   n   e   c    i    L  A British Standard does not purport to include 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 and ii, pages 1 and 2 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 6319 January 1968 5680 July 1988 Comments Indicated by a sideline in the margin    I    S    B    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    0    1   :    9    0    9    0    0    2    /    3    0    /    5    0  ,   s   c    i    t   u   a   n   o   r   e    A   n   a    t   s   u    d   n    i    H  ,   n   a   n    h   s    i   r    k   a    l   a   p   o    G   a   n   a    j   n   a    K  .   s   r    M   :   y   p   o    C    d   e   s   n   e   c    i    L BS 2S 98:1964 Contents Page 1 2 3 4 5 6 7 © BSI 02-2000 Inspection and testing procedure Process of manufacture Chemical composition Surface dressing Condition Final heat treatment Mechanical properties 1 1 1 1 2 2 2 i    I    S    B    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    0    1   :    9    0    9    0    0    2    /    3    0    /    5    0  ,   s   c    i    t   u   a   n   o   r   e    A   n   a    t   s   u    d   n    i    H  ,   n   a   n    h   s    i   r    k   a    l   a   p   o    G   a   n   a    j   n   a    K  .   s   r    M   :   y   p   o    C    d   e   s   n   e ii   c    i    L blank    I    S    B    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    0    1   :    9    0    9    0    0    2    /    3    0    /    5    0  ,   s   c    i    t   u   a   n   o   r   e    A   n   a    t   s   u    d   n    i    H  ,   n   a   n    h   s    i   r    k   a    l   a   p   o    G   a   n   a    j   n   a    K  .   s   r    M   :   y   p   o    C    d   e   s   n   e   c    i    L BS 2S 98:1964 NOTE 1 Where metric equivalents are stated the figures in British units are to be regarded as the standard. Where Fahrenheit equivalents are stated, the temperatures in degrees Celsius are to be regarded as the standard. The conversions are approximate. More accurate conversions should be based on the tables in BS 350, “Conversion factors and tables” . NOTE 2 In place of the customary, but incorrect use of the pound, ton or kilogramme as units of force, the units called pound-force (abbreviation lbf), ton-force (abbreviation tonf) or kilogramme-force (abbreviation kgf) have been used in this standard. These are the forces which, when acting on a body of mass one pound, one ton or one kilogramme respectively, give it an acceleration equal to that of standard gravity. 1 Inspection and testing procedure 1.1 This British Standard shall be used in conjunction with the relevant sections of BS 3S 100 as follows:  Bars for machining delivered in other than the finally heat treated condition. (See clause 5.1) Sections 1 and 2. Bars for machining delivered in the finally heat treated condition Billets and bars for forging Forgings Parts heat treated after machining Sections 1 and 3. Sections 1 and 5. Sections 1 and 6. Sections 1 and 7. 1.2 Sulphur printing or deep etching tests . Samples shall be selected in accordance with BS 3S 100, Section 1, Clause 7.2.1. 1.3 Ultrasonic examination. Rolled billets and bars to this British Standard shall be subjected to ultrasonic examination for internal cavities in accordance with BS 3 S 100, Appendix C. 2 Process of manufacture The material shall be manufactured by an electric process, unless otherwise agreed between the manufacturer and the purchaser in accordance with BS 3S 100, Section 1, Clause 3.1. 3 Chemical composition The steel shall contain: Per cent Element Carbon Silicon Manganese Nickel Chromium Molybdenum Sulphur Phosphorus  Aluminium min. 0.36 0.10 0.45 2.3 0.5 0.45  —   —  0.015 max. 0.44 0.35 0.7 2.8 0.8 0.65 0.015 0.025 0.050 4 Surface dressing The material shall be overall dressed in accordance with the requirements of BS 3S 100, Section 1, Clause 5.1. © BSI 02-2000 1    I    S    B BS 2S 98:1964    )   c    (  ,   y   p   o    C    d   e    l    l 5 Condition   o   r 5.1 The material shall be supplied in the appropriate condition stated below unless otherwise agreed    t   n between the manufacturer and the purchaser in which case the condition in which the material is to be   o supplied shall be stated on the order.   c   n Material Condition of supply    U Designation  , Black bars for machining Finally heat treated    0 S.98B    1 Bright bars for machining Finally heat treated and   : S.98D    9 cold drawn  before or    0  after final or cold rolled    9  or machined heat    0   treatment or ground    0    2    / S.98A Billets and bars for forging Softened    3    0 Forgings Finally heat treated    / S.98C    5    0 5.2 Parts shall be supplied finally heat treated.  ,   s 5.3 Parts made from forgings or bars in other than the finally heat treated condition shall be finally heat   c treated after being machined to as near finished siz e as practicable.    i    t   u 6 Final heat treatment   a   n 6.1 Except as provided in Clause 6.3, the final heat treatment shall be:   o   r   e a) Harden in oil from a temperature between 820 C and 850 C (1 510 F and 1 560 F).    A b) Temper at a suitable temperature between 500 C and 660 C (930 F and 1 220 F).   n 6.2 Hardened and tempered bars which have been subjected to a cold straightening or cold rolling operation   a shall be given a stress relieving treatment which shall be sufficient to restore the proof stress.    t   s 6.3 Alternatively to Clause 6.1, forgings and parts shall be heat treated in accordance with the   u    d requirements of the drawing or order, subject to the provisions of BS 3S 100, Section 6, Clause 4.1, or   n Section 7, Clause 3.1.    i    H  , 7 Mechanical properties   n   a 7.1 Mechanical tests. Except where they are required by BS 3S 100 to be agreed between the manufacturer   n and the purchaser, the mechanical properties obtained from test pieces selected and prepared in    h accordance with the relevant requirements of BS 3S 100 shall be:   s    i   r    k Elongation per cent on   a 0.2 per cent proof stress Tensile strength Impact    l gauge length   a   p tonf/sq in kgf/mm tonf/sq in kgf/mm 5.65ÆS o ft lbf    o    G min. min. min. max. min. max. min. min.   a 65 102 75 85 118 134 10 25   n   a    j   n NOTE The 0.1 per cent proof stress is expected to be not less than 65 tonf/sq in (102 kgf/mm ).   a    K 7.2 Hardness. The hardness of finally heat treated material and parts shall be:  . 341 min./388 max. HB   s   r    M or 360 min./410 max. HV   :   y   p   o    C    d   e   s   n © BSI 02-2000   e 2   c    i    L ° ° ° 2 ° ° ° ° ° 2 2    I    S    B    )   c    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    0    1   :    9    0    9    0    0    2    /    3    0    /    5    0  ,   s   c    i    t   u   a   n   o   r   e    A   n   a    t   s   u    d   n    i    H  ,   n   a   n    h   s    i   r    k   a    l   a   p   o    G   a   n   a    j   n   a    K  .   s   r    M   :   y   p   o    C    d   e   s   n   e   c    i    L blank    I    S    B BS 2S 98:    )   c 1964    (  ,   y   p   o    C    d   e    l    l   o   r    t   n   o   c   n    U  ,    0    1   :    9    0    9    0    0    2    /    3    0    /    5    0  ,   s   c    i    t   u   a   n   o   r   e    A   n   a    t   s   u    d   n    i    H  ,   n   a   n    h   s    i   r    k   a    l   a   p   o    G   a   n   a    j   n   a    K  .   s   r    M BSI   :   y 389 Chiswick High Road   p London   o    C W4 4AL    d   e   s   n   e   c    i    L BSI — British Standards Institution BSI is the independent national body responsible for preparing British Standards. 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