BS 970-1 1996 Specification for wrought steels for mechanical and allied engineering purposes. General inspection and testing procedures and specific.pdf
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1、BRITISH STANDARD BS 970-1: 1996 Specification for Wrought steels for mechanical and allied engineering purposes Part 1: General inspection and testing procedures and specific requirements for carbon, carbon manganese, alloy and stainless steels BS 970-1:1996 This British Standard, having been prepar
2、ed under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 May 1996 BSI 10-1998 First published July 1941 Second edition October 1942 Third edition March 1947 Fourth edition January 1955 Fifth edition (Part 1) February
3、 1972 (Part 2) September 1970 (Part 2) July 1971 (Supplement No. 1 to Part 3) May 1973 (Part 4) February 1970 Sixth edition (combined, as Part 1) May 1983 Seventh edition November 1991 Eighth edition May 1996 The following BSI references relate to the work on this standard: Committee reference ISE/3
4、1 Draft announced in BSI News September 1995 ISBN 0 580 25120 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ISE/31, Wrought steels, upon which the following bodies were represented: Lloyds Register of Shipping Nationa
5、l Association of Steel Stockholders Road Vehicle Spring Society Society of Motor Manufacturers and Traders Limited Spring Research and Manufacturers Association Department of Trade and Industry (National Physical Laboratory) Ministry of Defence British Chain Manufacturers Association British Enginee
6、rs Cutting Tools Association British Forging Industry Association British Industrial Fasteners Association British Iron and Steel Producers Association British Stainless Steel Association Amendments issued since publication Amd. No.DateComments BS 970-1:1996 BSI 10-1998i Contents Page Committees res
7、ponsibleInside front cover Forewordiii Section 1. General inspection and testing procedure 1.1Scope1 1.2References1 1.3Definitions1 1.4Symbols1 1.5General2 1.6Information to be supplied by the purchaser2 1.7Steelmaking and casting process3 1.8Chemical composition4 1.9Product analysis and permitted v
8、ariations5 1.10 Freedom from defects5 1.11 Condition of material on delivery6 1.12 Heat treatment8 1.13 Mechanical properties8 1.14 Selection and preparation of material for mechanical testing8 1.15 Frequency of other tests9 1.16 Test methods and test results10 1.17 Retests11 1.18 Inspection11 1.19
9、Manufacturers statement11 1.20 Marking11 Section 2. Specific requirements for as-rolled, as-rolled and softened and micro-alloyed carbon manganese steels 2.1Specific requirements for as-rolled, and as-rolled and softened steels12 2.2Specific requirements for micro-alloyed carbon manganese steels12 S
10、ection 3. Specific requirements for steels for surface hardening by nitriding15 Section 4. Specific requirements for case hardening steels 16 Section 5. Specific requirements for stainless and heat resisting steels 24 Section 6. Specific requirements for sizes and tolerances 6.1Sizes27 6.2Mass/unit
11、length tolerances27 6.3Dimensional tolerances27 6.4Straightness27 6.5Length27 Annex A Hardenability curves for case hardening steels31 Annex B Deoxidation of steel43 Figure A.1 Hardenability curves for case hardening steels32 Figure A.1.1 Alloy steels32 Figure A.1.1.1 Steel 523H1532 Figure A.1.1.2 S
12、teel 527H1733 Figure A.1.1.3 Steel 590H1734 Figure A.1.1.4 Steel 635H1534 Figure A.1.1.5 Steel 637H1735 Figure A.1.1.6 Steel 655H1335 Figure A.1.1.7 Steel 665H1736 BS 970-1:1996 ii BSI 10-1998 Page Figure A.1.1.8 Steel 665H2036 Figure A.1.1.9 Steel 665H2337 Figure A.1.1.10 Steel 708H2037 Figure A.1.
13、1.11 Steel 805H1738 Figure A.1.1.12 Steel 805H2038 Figure A.1.1.13 Steel 805H2239 Figure A.1.1.14 Steel 808H1739 Figure A.1.1.15 Steel 815H1740 Figure A.1.1.16 Steel 820H1740 Figure A.1.1.17 Steel 822H1741 Figure A.1.1.18 Steel 832H1341 Figure A.1.1.19 Steel 835H1542 Table 1 Sulfur and phosphorus co
14、mposition of steels4 Table 2 Incidental percentages of elements in steels4 Table 3 Permitted variations of product analysis from specified range6 Table 4 As-rolled and as-rolled and softened steels: chemical composition and mechanical property requirements13 Table 5 Micro-alloyed carbon manganese st
15、eels: chemical composition and mechanical property requirements14 Table 6 Steel for surface hardening by nitriding: chemical composition15 Table 7 Case hardening alloy steels: chemical composition and hardenability requirements17 Table 8 Case hardening steels: chemical composition and mechanical pro
16、perty requirements19 Table 9 Case hardening steels: heat treatment and maximum hardness requirements22 Table 10 Ferritic and martensitic stainless and heat resisting steels in the form of forgings: chemical composition, heat treatment and mechanical property requirements25 Table 11 Austenitic stainl
17、ess and heat resisting steels in the form of forgings and heat resisting steel 310S31 in all product forms: chemical composition, softening treatment and mechanical property requirements26 Table 12 Billets (other than stainless steel) for forging: standard mass per metre and tolerances28 Table 13 To
18、lerances for hot rolled round and square bar and rough turned rounds29 Table 14 Tolerances for hot rolled hexagonal bar29 Table 15 Tolerances for hot rolled flat bar30 List of referencesInside back cover BS 970-1:1996 BSI 10-1998iii Foreword This Part of BS 970 has been prepared by Technical Committ
19、ee ISE/31 and is technically equivalent to BS 970-1:1991 except that requirements for boron steels have been deleted. In addition this standard now only applies to stainless steels when in the form of forgings. This standard, together with BS EN 10083-3, BS EN 10088-1, and BS EN 10088-3 supersedes B
20、S 970-1:1991 which is withdrawn. This edition introduces technical changes but it does not reflect a full review or revision of the standard, which will be undertaken in due course. The European requirements for stainless steels in flat rolled and long rolled product forms, but not forgings, are spe
21、cified in BS EN 10088-1, and BS EN 10088-3 which are the English language versions of EN 10088-1, and EN 10088-3. The European requirements for boron steels are specified in BS EN 10083-3 which is published simultaneously with this standard. Work is continuing in Europe to prepare standards covering
22、 heat resisting steels, surface quality and case hardening steels. As the European Standards are published, the appropriate tables and text will be deleted from BS 970-1:1996 until it is eventually withdrawn. This edition of BS 970-1 still specifies Izod impact values for steels. It should be noted,
23、 however, that the Izod test is not accepted in Europe and that only Charpy impact tests will be specified in European Standards. 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. Compl
24、iance 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 to iv, pages 1 to 44, an inside back cover and a back cover. This standard has been updated (see copyright date) and may hav
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