JJIS_G3452_SGP_1997_
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ID： |
9B35B198BD3E4955A852D77973B980BE |
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文件大小(MB)： |
0.45 |
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页数： |
5 |
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文件格式： |
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日期： |
2024-7-31 |
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购买： |
文本摘录（文本识别可能有误，但文件阅览显示及打印正常，pdf文件可进行文字搜索定位）：
JIS G 3452 : 1997,Carbon steel pipes for ordinary piping,Introduction This Standard comes to be conformed with ^unifying performance test,jnethod of the equipments for water supply service^ established following the revision of,^standard of the structure and material of a water supply facility based on Water Works,Low". However, since steel pipes of this Standard are not suitable for water supply service,based on the Water Works Law, water supply service is eliminated from the applicable range,by this revision,1 Scope This Japanese Industrial Standard specifies the carbon, steel pipes (hereafter,refened to as the "pipes") used for the pipings for conveying steam, water (excepting public,Water supply service), oil, gas, air, etc, at comparatively low working pressures.,2 Normative references The standards shown in Attached Table 1 contain provisions,whichコ through reference in this Standard, constitute provisions of this Standard, The most,recent editions of the standards indicated below shall be applied.,3 Grade and designation The pipe shall be classified into one grade and its letter symbol,shall be as given in Table 1, and subdivided into black pipes and galvanized ones according,to nonexistence or existence of zinc-coated layers-,Table 1 Letter symbol of grade,Letter symbol of grade Division Remarks,SGP,Black pipe Pipe without zinc coating,Galvanized pipe Black pipe with zinc coating,Remarks: Where it is necessary to identify the galvanized pipe,by the letter symbol on the drawing and other docu?,ments, K -ZNJ1 shall be suffixed to the letter symbol,of the grade. This notation, however, shall not be,applied to the product itself,4 Chemical composition The pipe shall be subjected to the test of I LI and the resulting,ladle analysis values shall be as given in Table 2.,Unit: %,Table 2 Chemical composition,Letter symbol of grade P S,SGP 0.040 max. 04040 max.,5 Mechanical properties,5.1 Tensile strength and elongation The black pipe shall be subjected to the test of 11-3,and the resulting tensile strength and elongation shall be as given in Table 3.,—153 —,—G 3452^,Table 3 Mechanical properties,Letter symbol of grade Tensile strength,N/mm1,Elongation %,No. 11 and No. 12 test,pieces,No. 5 test piece,Longitudinal Transverse,SGP 290 min. * 30 min. 25 min.,Remarks 1. When the tensile test is carried out for No. 12 or No_ 5 test piece for,the pipe under 8 mm in wall thickness, the minimum value of elongation,shall be obtained by subtracting 1i5 % from the values of," elongation given in Table 3 for each 1 mm decrease in wall thickness,and rounding off to an integer in accordance with JIS Z 8401.,Examples of calculation are given in Informative reference Table 1.,2 The values of elongation given in Table 3 shall not be applied to the,pipe whose nominal size is 32 A or smalleri However, the value of,elongation shall be recorded.,3 In sampling the tensile test pieces, No. 12 or No. 5 test piece shall be,taken from the portion not involving welded seams-,Informative reference Table 1 Examples of elongation values calculated for,No. 12 test piece Gongitudinal) and No* 5 test,piece (transverse) taken from pipes under 8,mm in wall thickness,Shape of test piece,Elongation values for wall thickness divisions %,Over 7 mm to,and excL 8,mm,6 mm up,to and inch 7,mm,Over 5 mm up,to and inci. 6,mm,Over 4 mm up,to and inch 5,mm,Over 3 mm up,to and inci. 4,mm,No. 12 test piece 30 28 27 26 24,No. 5 test piece 25 24 22 20 J9,_ G 3452—,6 Uniformity of zinc coating The galvanized pipe shall be tested by 11.6 and the number,of dips in the uniformity test shall be as given in Table 4. In this case, the pipe shall not show,a fixed deposit of zinc even after the successive dipping operations of frequency given in,Table 4..,Table 4 Uniformity test,Letter symbol of grade Number of dips (One minute per dip),SGP . 5,7 Hydrostatic test characteristics or nondestructive test characteristics The black pipe,shall be tested by 11-7 and the resulting hydrostatic characteristic or nondestructive characteristic,shall conform either of the following two. Though the preference depends upon the,specification by the purchaser, when not specified by the purchaser, the preference shall be,selected by the manufacturer.,a) For hydrostatic test characteristics, when a hydrostatic pressure of 2-5 MPa is applied, the,black pipe shall withstand it without leakage.,b) For nondestructive examination characteristics, a nondestructive examination by either,an ultrasonic test on an eddy current test is carried out on the black pipe, and there shall,be no signal greater than those produced by the artificial defects of the reference ……
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