1、PUBLISHED DOCUMENT PD 970:2005 Incorporating Corrigendum No. 1 Wrought steels for mechanical and allied engineering purposes Requirements for carbon, carbon manganese and alloy hot worked or cold finished steels ICS 77.140.20 PD 970:2005 This Published Document was published under the authority of t
2、he Standards Policy and Strategy Committee on 31 January 2005 BSI 18 May 2005 First published November 2001 Second edition January 2005 The following BSI reference relates to the work on this Published Document: Committee reference ISE/31 ISBN 0 580 44904 1 Committees responsible for this Published
3、Document The preparation of this Published Document was entrusted to Technical Committee ISE/31, Wrought steels, upon which the following bodies were represented: Confederation of British Metalforming Institute of Spring Technology National Association of Steel Stockholders Society of Motor Manufact
4、urers and Traders Association UK Steel Association Co-opted members Amendments issued since publication Amd. No. Date Comments 15637 Corrigendum No. 1 18 May 2005 Correction to Table 7, (Column heading Impact KCV min)PD 970:2005 BSI 18 May 2005 i Contents Page Committees responsible Inside front cov
5、er Foreword iii 1S c o p e 1 2 Normative references 1 3T e r m s a n d d e f i n i t i o n s 2 4 Designation 2 5 Information to be supplied by the purchaser 3 6 Manufacturing process 4 7 Requirements 4 8 Inspection and testing 9 9 Marking 12 10 Specific requirements for hot rolled or normalized or s
6、oftened steels and for steels supplied as cold finished bar 12 11 Specific requirements for quenched and tempered steels including steels capable of surface hardening by nitriding for special applications 25 12 Specific requirements for case hardening steels 30 13 Specific requirements for tolerance
7、s 32 14 Cut end condition 36 Annex A (informative) Correlation between steels from BS 970-1:1983, PD 970:2005 and current nationally adopted European Standards 37 Bibliography 43 Figure 1 Types of deviation from square 34 Figure 2 Edge camber of wide flats 35 Table 1 Permitted variations of product
8、analysis from specified range 6 Table 2 Reference symbols for tensile strength ranges of hardened and tempered material 7 Table 3 Surface quality classes for cold finished products (excluding flats) 9 Table 4 Surface quality classes for cold finished flat bars examined by visual inspection 9 Table 5
9、 Hot rolled or normalized or softened steels: chemical composition and mechanical property requirements 13 Table 6 Normalizing requirements 14 Table 7 Steels supplied as cold finished bar: chemical composition and mechanical property requirements 15 Table 8 Quenched and tempered steels including ste
10、els capable of surface hardening by nitriding: chemical composition and mechanical property requirements 25 Table 9 Quenched and tempered steels: heat treatment and maximum hardness requirements in the softened condition 29 Table 10 Hardenability requirements for 708H37 30PD 970:2005 ii BSI 18 May 2
11、005 Page Table 11 Case hardening alloy steels: chemical composition and hardenability requirements 30 Table 12 Case hardening carbon manganese and low alloy steels: chemical composition and mechanical property requirements 31 Table 13 Case hardening steels: heat treatment and maximum hardness requir
12、ements 32 Table 14 Thickness tolerances for wide flats 33 Table 15 Deviation from squareness of edges for wide flats 34 Table 16 Tolerances for hot rolled round, square and hexagon bars suitable for cold finishing 36 Table A.1 Correlation between steels from BS 970-1:1983, PD 970:2005 and current na
13、tionally adopted European Standards 37PD 970:2005 BSI 18 May 2005 iii Foreword This Published Document has been prepared by Technical Committee ISE/31. It supersedes PD 970:2001, which is withdrawn. Some errors in PD 970:2001 have been corrected and some steel grades that are in regular use in the U
14、K have been introduced as they did not have equivalents in the newly published European Standards and the withdrawal of BS 970 in which they were listed had resulted in them not being identified within any current document. BS 970-1:1996 is to be withdrawn and has been largely replaced by BS EN 1008
15、3:1991 (soon to be revised), BS EN 10084:1998, BS EN 10087:1999, BS EN 10088:1995, BS EN 10095:1999 and BS EN 10250-4:2000. BS 970-2:1988 is withdrawn and has been replaced by BS EN 10089:2002. BS 970-3:1991 is withdrawn and has been replaced by BS EN 10277:1999 and BS EN 10278:1999. BS 970-4 is wit
16、hdrawn and has been replaced by BS EN 10090:1998. The series of European Standards listed below covers heat treatable and engineering steels for both black and cold finished bar that were present in BS 970-1:1996 and BS 970-3:1991, or other European Standards. Steel grades BS EN 10083-1, Quenched an
17、d tempered steels Part 1: Technical delivery conditions for special steels. BS EN 10083-2, Quenched and tempered steels Part 2: Technical delivery conditions for unalloyed quality steels. BS EN 10083-3, Quenched and tempered steels Part 3: Technical delivery conditions for boron steels. BS EN 10084,
18、 Case hardening steels Technical delivery conditions. BS EN 10085, Nitriding steels Technical delivery conditions. BS EN 10087, Free cutting steels Technical delivery conditions for semi-finished products, hot rolled bars and rods. BS EN 10088-1, Stainless steels Part 1: List of stainless steels. BS
19、 EN 10088-3, Stainless steels Part 3: Technical delivery conditions for semi-finished products, bars, rods and sections for general purposes. BS EN 10089, Hot rolled steels for quenched and tempered springs Technical delivery conditions. BS EN 10090, Valve steels and alloys for internal combustion e
20、ngines. BS EN 10095, Heat resisting steels and nickel alloys. BS EN 10250-2, Open die steel forgings for general engineering purposes Part 2: Non-alloy quality and special steels. BS EN 10250-3, Open die steel forgings for general engineering purposes Part 3: Alloy special steels. BS EN 10250-4, Ope
21、n die steel forgings for general engineering purposes Part 4: Stainless steels. BS EN 10267, Ferritic-pearlitic steels for precipitation hardening from hot working temperatures.PD 970:2005 iv BSI 18 May 2005 BS EN 10277-1, Bright steel products Technical delivery conditions Part 1: General. BS EN 10
22、277-2, Bright steel products Technical delivery conditions Part 2: Steels for general engineering purposes. BS EN 10277-3, Bright steel products Technical delivery conditions Part 3: Free-cutting steels. BS EN 10277-4, Bright steel products Technical delivery conditions Part 4: Case-hardening steels
23、. BS EN 10277-5, Bright steel products Technical delivery conditions Part 5: Steels for quenching and tempering. BS EN ISO 683-17, Heat-treated steels, alloy steels and free-cutting steels Part 17: Ball and roller bearing steels. Dimensions, tolerances and surface quality BS EN 10058, Hot rolled fla
24、t steel bars for general purposes Dimensions and tolerances on shape and dimensions. BS EN 10059, Hot rolled square steel bars for general purposes Dimensions and tolerances on shape and dimensions. BS EN 10060, Hot rolled round steel bars Dimensions and tolerances on shape and dimensions. BS EN 100
25、61, Hot rolled hexagon steel bars Dimensions and tolerances on shape and dimensions. BS EN 10092-1, Hot rolled spring steel flat bars Part 1: Flat bars Dimensions and tolerances on shape and dimensions. BS EN 10092-2, Hot rolled spring steel flat bars Part 2: Ribbed and grooved spring leaves Dimensi
26、ons and tolerances on shape and dimensions. BS EN 10221, Specification for surface quality classes for hot rolled bars and rods Technical delivery conditions. BS EN 10250-1, Open die steel forgings for general engineering purposes Part 1: General requirements. BS EN 10278, Dimensions and tolerances
27、of bright steel products. BS EN 20286-2, ISO system of limits and fits Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts. UK Steel Standard UKS01, Semi-finished steel products for the manufacture of hot rolled bar, rod and sections 1) 1. Any steel grade that has p
28、reviously appeared in BS 970:1983 and is now specified as an equivalent grade in one of the above European Standards is cross-referenced in Annex A which is informative. This Published Document is not to be regarded as a British Standard. This publication does not purport to include all the necessar
29、y provisions of a contract. Users are responsible for its correct application. Compliance with a Published Document 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 43 and a back cover.
30、 The BSI copyright notice displayed in this document indicates when the document was last issued. 1) UKS01 is available from UK Steel, EEF, Broadway House, Tothill Street, London SW1H 9NQ.PD 970:2005 BSI 18 May 2005 1 1 Scope This Published Document specifies the technical purchase and supply requir
31、ements for the following wrought semi-finished products manufactured from a range of carbon, carbon manganese, low alloy, free-cutting, case-hardening and through hardened steels for the following special applications: blooms; billets; slabs; bars; rod; flats and wide flats. NOTE These wrought steel
32、s may be supplied in the hot formed condition or as thermally treated black bar. Cold finished bar may be subjected to pre- or post-thermal treatment. It does not specify any boron, micro-alloyed, stainless steels or any products delivered as forgings, which are all covered by other standards (see F
33、oreword). It does not apply to direct cast products. PD 970 is presented in the style of a European Standard and references other European Standards (e.g. test methods) wherever possible. The traditional seven digit alphanumeric UK designation is maintained, though it is important to note that the “
34、A”, “M” and “H” system (nominally representing Analysis, Mechanical and Hardenability) should not be confused with other nomenclature. This applies equally to the conventional tensile strength range designations, namely P through to Z which are still used in this document. Certain other aspects such
35、 as requirements for steelmaking, deoxidation and grain size have been revised to reflect modern technology. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references,
36、 the latest edition of the referenced document (including any amendments) applies. BS 131-1, Notched bar tests Part 1: The Izod impact test of metals. BS EN 10002-1, Tensile testing of metallic materials Part 1: Method of test at ambient temperature. BS EN 10020, Definition and classification of gra
37、des of steel. BS EN 10021, General technical delivery requirements for steel and iron products. BS EN 10045-1, Charpy impact test on metallic materials Part 1: Test method (V- and U-notches). BS EN 10052, Vocabulary of heat treatment terms for ferrous products. BS EN 10058, Hot rolled flat steel bar
38、s for general purposes Dimensions and tolerances on shape and dimensions. BS EN 10059, Hot rolled square steel bars for general purposes Dimensions and tolerances on shape and dimensions. BS EN 10060, Hot rolled round steel bars for general purposes Dimensions and tolerances on shape and dimensions.
39、 BS EN 10061, Hot rolled hexagonal steel bars for general purposes Dimensions and tolerances on shape and dimensions. BS EN 10079, Definition of steel products. BS EN 10204, Metallic products Types of inspection documents. BS EN 10278, Dimensions and tolerances of bright steel products. BS EN 20286-
40、2:1993, ISO system of limits and fits Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts. BS EN ISO 642, Steel hardenability test by end quenching (Jominy test).PD 970:2005 2 BSI 18 May 2005 BS EN ISO 643, Steels Micrographic determination of the apparent grain siz
41、e. BS EN ISO 6506-1, Metallic materials Brinell hardness test Part 1: Test method. BS EN ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method. BS EN ISO 6508-1, Metallic materials Rockwell hardness test Part 1: Test method ( s c a l e sA ,B ,C ,D ,E , F , G , H , K , N , T ) . DD
42、 ENV 606, Bar coded transport and handling labels for steel products. 3 Terms and definitions For the purpose of this Published Document the terms and definitions given in BS EN 10020, BS EN 10021, BS EN 10052 and BS EN 10079 and the following apply. 3.1 ruling section equivalent diameter of that po
43、rtion of a product at the time of heat treatment that is most important in relation to mechanical properties 3.2 limiting ruling section largest diameter in which certain specified mechanical properties are achieved after a specified heat treatment 3.3 equivalent diameter diameter at the time of hea
44、t treatment of a hypothetical very long bar, effectively of infinite length and uniform circular cross-section, which, if subjected to the same cooling conditions as the product would have a cooling rate at its axis equivalent to that at the slowest cooling position in the product or relevant part N
45、OTE 1 This definition applies to any product or part of a product. NOTE 2 The same cooling conditions means the same initial and final temperature and the same cooling medium. 4 Designation The steel grades shall be designated in accordance with the system used previously in BS 970. “A” grades shall
46、 refer to close limits of chemical composition where no mechanical properties or hardenability are required. “M” and “H” grades shall refer to mechanical and hardenability requirements which are specified in combination with a chemical composition which may be wider than that given for “A” grades. N
47、OTE Material may be ordered and supplied without heat treatment where appropriate test pieces have been heat treated and tested to prove the capability of the material to meet the required properties. Unless otherwise agreed at the time of enquiry or order the products shall be delivered in the untr
48、eated, i.e. hot worked condition.PD 970:2005 BSI 18 May 2005 3 5 Information to be supplied by the purchaser 5.1 Mandatory information to be supplied at the time of enquiry and order The following information shall be supplied by the purchaser at the time of enquiry and order: a) the quantity to be
49、delivered, e.g. 2 t; b) the shape of the product, e.g. round, hexagon, flat; c) the dimensions and tolerances on dimensions and shape; d) the number of this Published Document (PD 970:2005); e) the intended application of the product and, where known, its intended end use; f) the steel grade; g) if ordered in accordance with the mechanical property requirem
