1、BSI BSm44Bb 80 3b2Ybb O007723 7 BS 4486 :I 980 UDC 669.14.018.295.3-422-122.4: 666.982.4 S pecif kat ion for Hot rolled and hot rolled and processed high tensile alloy steel bars for the prestressing of concrete Spcification pour les barres en acier alli haute rsistance lamines chaud et lamines chau
2、d et transformes pour la prcontrainte du bton Spezifikation fr warmgewalzte sowie warmgewalzte und bearbeitete hochfeste Legierungsstahlstangen fr das Vorspannen von Beton British Standards Institution Gr3 w BS 4486 : 1980 Contents Page Foreword Inside front cover Cooperating organizations Back cove
3、r Specification 1. Scope 1 2. References 1 3. Definitions 1 4. Designation for enquiry and order purposes 1 5. Manufacture 1 Foreword This British Standard, prepared under the direction of the Iron and Steel Standards Committee, was first published in 1969, and specifies requirements for cold worked
4、 high tensile alloy steel bars used in prestressed concrete. During the period since 1969, the European Coal and Steel Community in Project Group 101 generated Euronorm 138 Prestressing steels. This revision of BS 4486: 1969 for hot rolled and hot rolled and processed high tensile steel bars for the
5、 prestressing of 6. Mass of processed bar tendons 7. Dimensions and properties 8; Periodic tests 9. Routine testing and inspection Page 2 2 2 2 Table 1. Dimensions and properties of hot rolled and hot rolled and processed high tensile alloy steel bars 4 concrete supersedes the 1969 issue and it clos
6、ely follows the appropriate parts of Euronorm 138, but some minor changes have been made in order to make it applicable to the requirements of the United Kingdom. Requirements for high tensile steel wire and strand for the prestressing of concrete are specified in BS 5896. sd are advised to consider
7、 the desirability of third party certification of product conformity with this British Standard based on testing and continuing surveillance, which may be coupled with assessment of a suppliers quality system against the appropriate Part of BS 5750. Enquiries as to the availability of third party ce
8、rtification schemes will be forwarded by BSI to the Association of Certification Bodies. If a third party certification scheme does not already exist, users should consider approaching an appropriate body from the list of association members. NOTE. Attention is drawn to the requirements in 9.2 for m
9、aterial covered by a certification scheme. Compliance with a British Standard does not of itself confer immunity from legal obligations. BSI BSm4YBb 80 m Lb24669 0007723 O m BS 4486 : 1980 British Standard Specification for Hot rolled and hot rolled and processed high tensile alloy steel bars for th
10、e prestressing of concrete 1. Scope 4.2 The bars shall be designated as follows: A This British Standard specifies requirements for preferred sizes of smooth or deformedialloy steel bars in straight lengths supplied in the hot rolled or hot rolled and processed conditions. Two nominal strength level
11、s of steel are specified. This standard does not specify fatigue testing, this subject being included in BS 4447. Stress-corrosion (a) BS 4486; (b) RE = smooth, RR = deformed (c) nominal diameter; (d) nominal tensile strength. Example. A round smooth bar of 32 mm nominal diameter and 1030 N/mm2 nomi
12、nal tensile strength is designated . testing is not specified. BS 4486-RE-32-1030. 2. References The titles of the standards publications referred to in this standard are listed on the inside back cover. 3. Definitions For the purposes of this British Standard, the following definitions apply. 3.1 c
13、ast. Usually the product of a single furnace charge. ladles, the product of each ladle may be called a separate cast. 3.2 bar. A steel product produced in straight lengths by hot rolling of steel and which may be smooth or deformed Processed bars are bars subsequently processed by stretching or othe
14、r forms of cold working, and which also may have an additional tempering treatment to give the required properties. 3.3 bar tendon. A bar used in prestressed concrete. 5. Manufacture 5.1 Unless the process is specified by the purchaser in his order, the steel may be made by any process except that t
15、he air, and mixed air/oxygen bottom blown basic converter processes shall not be mechanical properties. Such processing may take the form 5.2 The steel shall be hot rolled into bars. Subsequent processing may be required to achieve the specified freatment may follow such cold working., sulphur or mo
16、re than 0.040 % phosphorus. 5.4 If required by the purchaser, a chemical analysis of the steel shall be provided by the supplier. 5.5 When deformed . Where the furnace contents are tapped into Or more of cold working by stretching and tempering 5.3 ne cast analysis shall not show more than 0.040 . s
17、hall be transversed with a substantially uniform spacing not greater than 0.8 nominal size; this applies to continuous or discontinuous helical deformations, where present. 3.4 nominal size. The diameter of a nominally round bar. The deformation shall be in the form of ribs or of a thread. For defor
18、medibar the nominal size is the diameter ofa round The mean area of ribs or thread per unit length above the bar of the same cross-sectional area. core of the bar, projected on a plane normal to the axis of 3.5 length. A piece of straight bar, without joint, cut to a specified length. 3.6 batch. A n
19、umber of lengths of one nominal size from one cast. 3.7 consignment. Ani quantity of material prepared at any one time for delivery to one location. 4. Designation for enquiry and order purposes 4.1 When ordering material to this standard, the purchaser shall state: (a) the number of this British St
20、andard, .e. BS 4486; (b) type of surface, .e. smooth or deformed (c) nominal size; (d) nominal tensile strength; (e) packing and protection requirements. ! the bar, shall not be less than (0.15 nominal size) mm2 per mm of bar length. 5.6 Where bars are threaded after processing, the thread : shall b
21、e cold rolled. When used with suitably designed components, threads shall be capable of compliance with . the . requirements of BS 4447 and .- note4of table 1.; : 5.7 The finished material shall be free from defects, which may have occurred at any stage during mariufacture, to a degree that would im
22、pair the performance as a prestressing bar. -Longitudinal cracks that do not impair the specified properties of the bar shall not be considered as a defect. 5.8 Production lengths shall contain no welds. All bars shall be protected at all stages of manufacture from the effects of local heat, whether
23、 by weld splash or other accidental means. The manufacturer shall give adequate protection to prevent corrosion and damage to bars before delivery to the purchaser. In particular, threaded ends shall be treated to retain a film of lubricating oil on threads. NOTE. Coatings for specific purposes are
24、to be applied to the surface of the steel only if previously agreed between the manufacturer and the purchaser, Such coatings are not specified in this standard. . -_ BSI BS*VllBb 80 m BS 4486 : 1980 lb24bbS 0007724 2 m 6. Mass of processed bar tendons 6.1 The mass of bar tendons shall be calculated
25、 on the basis that the density of steel is 7850 kg/m3. 6.2 Where bars are ordered and supplied by mass, the mass of finished bar tendons shall not differ from the mass calculated on the nominal diameter by more than the tolerances shown in table 1. 7. Dimensins and properties 7.1 Dimensions. The dim
26、ensions of bars shall be in accordance with table 1, 7.2 Properties 7.2.1 General. Bar design data, tolerances and specified properties of bars shall be in accordance with table 1 and their mechanical properties shall be in accordance with 7.2.2, 7.2.3 and 7.2.4. 7.2.2 Specified characteristic value
27、. In this standard specified characteristic values are shown as specified characteristic breaking loads and specified characteristic 0.1 % proof loads. For prestressing steel the specified characteristic value is the lower limit of the one sided statistical tolerance interval for which there is a 95
28、 % probability that at least 95 % of the values will be equal to or greater than this lower limit. For the practical application of this criterion it is arbitrarily assumed that the distribution is normal (BS 2846 : Part 3 refers). In manufacturers inspection the criterion may be considered to be me
29、t if, in each homogenous production lot, not more than 5 % of the test results are less than the specified characteristic value and no test result is less than 95 % of this value. 7.2.3 Maximum standard deviation. For the statistical interpretation of data (see 9.3.4) a maximum standard deviation is
30、 given for breaking load and 0.1 % proof load. The maximum standard deviation is the maximum value of the standard deviation based on the entire production of one manufacturer for a sufficiently long period using the same process and technique. Specified characteristic values associated with maximum
31、 standard deviations indicate the desired level and degree of consistency of the property under consideration. The maximum standard deviations specified are intended for application in: (a) manufacturers inspection for the verification of the degree of consistency of the production; and (b) acceptan
32、ce tests of material not covered by a certification scheme, for comparison with the standard deviation of the sample in accordance with 9.3.4. 7.2.4 Elongation. The percentage elongation after fracture shall be determined on a gauge length of 5.65 (b) a summary of the relevant test results from the
33、manufacturers records; (c) the modulus of elasticity at 70 % of the specified characteristic strength. 9.2.3 Compliance. The consignment shall be deemed to comply with the requirements of this standard on the basis of the manufacturers test certificate, normally without the need for further testing.
34、 This does not preclude the purchasers option to carry out further tests to verify that the specified properties have been obtained. y- - 2 ES1 BS*44Bb BO Lb24bb 0007725 4 9.3 Material not covered by a certification scheme 9.3.1 Documentation. Documentary evidence of manufacturers ability to comply
35、with the requirements of this standard is required as follows. The manufacturer shall provide a survey of his recent inspection tests for all the properties appropriate to the product specified in this standard. If the manufacturer has not previously or recently supplied material to this standard, b
36、y agreement with the purchaser recent data on material to a similar specification may be submitted. Data on long-term behaviour normally covered by periodical testing may be talten from manufacturers records of tests on recent productions of similar material. 9.3.2 Inspection of consignments. Each s
37、eparate consignment shall be subject to inspection by the manufacturer in accordance with 9.1 with the exception of the tests for iong-term behaviour. 9.3.3 Test certificates. Each consignment shall be accompanied by a test certificate containing: (a) all the information necessary to identify the co
38、nsignment; (b) all the test results obtained in testing the consignment; (c) load-extension diagrams covering the testing of materials used to make up the consignment; (d) cast analysis of the steel. 9.3.4 Acceptance. If the purchaser is satisfied with the manufacturers ability to supply material th
39、at complies with the requirements of this standard, but wishes to have further or independent inspection in addition to that given by the manufacturers test certificate, the details shall be agreed at the time of ordering the material. Such purchasers acceptance tests for the properties listed in 9.
40、1 shall be made on a sample selected as follows. The unit of production from which a test piece is selected shall be 5 t. The consignment shall be divided into inspection lots of 100 t and a test piece shall be selected from each BS 4486 : 1980 unit in a random selection of 15 units of production in
41、 the inspection lot. If there are less than 15 units in the lot, then additional test pieces shall be taken from separate bars sufficient to make up the required number. Analysis of the results of the breaking load and proof load tests made on the sample shall show compliance with the specified char
42、acteristic values and maximum standard deviation specified in this standard. Statistical interpreta- tion of data shall be in accordance with table 3 of BS 2846:Part 3:1975 and table E of BS 2846:Part 4:1976 both for one-sided tolerance interval of 0.95 and for confidencelevel 0.95. For all other pr
43、operties, all test results shall show compliance with the requirements of this standard. 9.4 Retests 9.4.1 Tests for compliance with specified characteristic values. No retests are allowed, except where there has been a malfunction in the test procedure. 9.4.2 Tests for compliance with all other mec
44、hanical properties (a) Manufacturers inspection. If any test piece fails any of the other specified mechanical tests, two additional test pieces shall be taken from the same unit of production. These test pieces shall be subjected to the same test or tests that the original test piece failed. If bot
45、h test pieces pass the tests then that unit of production shall be deemed to comply with the requirements of this standard. If one of the retest pieces fails then the unit of production shall be deemed not to comply with this standard, (b) Purchasers testing of non-certified material. For material i
46、nspected according to 9.3.4, if any test piece fails, the purchasers inspection lot shall be deemed not to comply with the requirements of this standard until the same test or tests have been satisfactorily completed on a further random selection of 15 units of production in the inspection lot. . 3
47、BSI BS*448b 80 Lb24669 0007726 6 M . BS 4486 : 1980 c N v) %o00 unwhw W coocoo wmd-o mwom rr O m 0 8 c .- s a m m U C c m E Y al C - . YI Y - m .- E 2 U m .cl L Y- .c C .- a E o c U YI E“ - m i C P E c m - I- C m W 5 5 n P M W m O - Y n 8 e O O - BSI BS*44Bb BO m Lb24bb 0007727 B m Standards publica
48、tions referred to BS 18 ES 2846 Methods for tensile testing of metals - Part 2 Steel (general) Guide to statistical interpretation of data Part 3 Determination of a statistical tolerance interval Part 4 Techniques of estimation and tests relating to means and variances The performance of prestressin
49、g anchorages for post-tensioned construction Specification for high tensile steel wire and strand for the prestressing of concrete O ES 4447 BS 5896 Euronorm 138 Prestressing steels - .o A - - BSI BS*Ll48b 80 W 162Llbb 0007728 TI Amd. No. Date of issue This British Standard, having been prepared under the direction of the Iron and Steel Standards Committee, was published under the authority of the Executive Board and comes into effect on 31 March 1980. British Standards Institution, 1980 First published August 1969 First revisio
