GB/T 17600.2-1998 PDF EnglishUS$90.00 · In stock · Download in 9 seconds
GB/T 17600.2-1998: Steel. Conversion of elongation values. Part 2: Austenitic steels Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure
Similar standardsGB/T 17600.2-1998: Steel. Conversion of elongation values. Part 2: Austenitic steels---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT17600.2-1998GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.040.10 H 22 eqv ISO 2566-2.1984 Steel - Conversion of elongation values - Part 2. Austenitic steels Issued on: DECEMBER 07, 1998 Implemented on: JULY 01, 1999 Issued by. China Quality and Technology Supervision Bureau Table of ContentsForeword ... 3 ISO foreword ... 4 1 Scope ... 5 2 References ... 5 3 Definitions ... 6 4 Symbols ... 6 5 Elongation conversions ... 7 6 Use of graphs... 10ForewordThis Standard is equivalent to the International Standard ISO 2566-2.1984 “Steel - Conversion of elongation values - Part 2. Austenitic steels”. This Standard is identical to ISO 2566-1.1984 in terms of scope of application, conversion formula and conversion result. This Standard has the following differences from the ISO standard. 1. This standard gives the basic formula for elongation conversion compared with ISO 2566-2. The ISO standard only gives conversion formulas under two specific conditions between 5.65ඥ𝑆 and 4ඥ𝑆 gauge lengths AND the non-proportional gauge length, which can be derived from the basic formula. 2. The conversion formula given in this Standard contains the calculation formulas in all the conversion tables in the ISO standard. Therefore, the 21 conversion tables in the ISO standard are reduced to 4. 3. The symbols used in this Standard are consistent with GB/T 228-1987 “Metallic materials - Tensile testing” and GB/T 10623-1989 “Metallic materials - Terms of mechanical test”, which are slightly different from the ISO standard. GB/T 17600 consists of two parts under the general title of “Steel - Conversion of elongation values”. GB/T 17600. 1-1998 Part 1. Carbon and low alloy steels GB/T 17600. 2-1998 Part 2. Austenitic steels This Standard was proposed by National Metallurgical Industry Bureau. This Standard shall be under the jurisdiction of National Technical Committee on Steel of Standardization Administration of China. Drafting organizations of this Standard. China Metallurgical Information Standardization Institute, Special Steel Co., Ltd. of Benxi Steel Group Corporation, Steel Research Institute of Taiyuan Iron & Steel Co., Ltd. Main drafters of this Standard. Jiang Qingmei, Ye Zhenhua, Luan Yan, Du Juan, Wang Feng, Cai Shida. Steel - Conversion of elongation values - Part 2. Austenitic steels1 ScopeThis Standard specifies a method of converting room temperature elongations after fracture obtained on various gauge lengths. It includes the conversion formula and the conversion factor table of the elongation, as well as the graphs for performing such conversions. This Standard is applicable to the test piece of austenitic stainless steels in solution treatment condition within the tensile strength range 450 to 750 MPa, with an original gauge length not exceed 25ඥ𝑆, and a width to thickness ratio not exceed 20. This Standard is not applicable to cold rolled steels, quenched and tempered steels and non-austenitic steels. In the case of plate test piece under 3 mm thickness, the index n in formula (1) of this Standard increases with decreasing thickness. The conversion value of elongation shall be the subject of agreement between the customer and the supplier. The conversion method of this Standard is adopted internationally, and the conversions are reliable within the scope of this Standard. However, because of the various factors influencing the determination of elongations, whether to use the conversions of this Standard shall be determined by the relevant standards or agreements In cases of dispute or arbitration, the elongation value shall be determined on the gauge length stated in the relevant standards or agreements.2 ReferencesThe following standards contain provisions which, through reference in this Standard, constitute provisions of this Standard. At the time of publication, the editions indicated are valid. All standards are subject to revision. The parties who are using this Standard shall explore the possibility of using the latest version of the following standards. 5.5 Conversion from the elongation of a non-proportional gauge length to the elongation of another non-proportional gauge length for test pieces of different cross-sectional areas Convert according to formula (1). It may also convert in two steps using Table 4 or Table 5. Firstly, convert the elongation of the known gauge length to the elongation of the proportional gauge length, such as 5.65ඥ𝑆 or 4ඥ𝑆; then convert it to the elongation of the non-proportional gauge length to be obtained. Example. The elongation of a 40 mm × 15 mm test piece with 200 mm gauge length is 24 %, which is to be converted to a 30 mm × 10 mm test piece with 200 mm, 100 mm and 50 mm gauge lengths. Firstly, according to Table 4, convert to the elongation of 5.65ඥ𝑆 gauge length, that is 24 % × 1/0.957 = 25.1 %; convert to the elongation of 30 mm × 10 mm, 200 mm gauge length, i.e. ඥ𝑆25.1 % × 0.916 = 23.0 %, which is rounded off to 23 %; convert to the elongation of 30 mm × 10 mm, 100 mm gauge length, ඥ𝑆25.1 % × 1.000 = 25.1 %, which is rounded off to 25 %; convert to the elongation of 30 mm × 10 mm, 50 mm gauge length, ඥ𝑆25.1 % × 1.093 = 27.40 %, which is rounded off to 27 %. The elongation of other proportional gauge lengths may be converted according to the conversion factors given in Table 2.6 Use of graphs6.1 Figures 1 to 5 may be used as an alternative quick method for elongation conversions. 6.2 Figures 1 and 2 are obtained by taking the logarithm on both sides of the equation according to formula (5). Figure 1 is used for elongation conversions between 5.65ඥ𝑆 and 50 mm gauge lengths. Figure 2 is for elongation conversions between 5.65ඥ𝑆 and 200 mm gauge lengths. Example. For 25 mm × 12.5 mm test piece with a cross-sectional area of 312.5 mm2 and a gauge length of 200 mm, the elongation is 25 %. It is to obtain the elongation of 5.65ඥ𝑆 gauge length. Find 312.5 mm2 on the abscissa and find 25 on the ordinate of Figure 2. The value corresponding to the oblique line passing through the intersection point is 27.2 %, which is rounded off to 27 %, that is the elongation of 5.65ඥ𝑆 gauge length to be obtained. 6.3 Figures 3 and 4 are obtained by taking the logarithm on both sides of the equation according to formula (6). They are used for elongation conversions between 4ඥ𝑆 and 50 mm and between 4ඥ𝑆 and 200 mm, respectively, using the same method as 6.2. 6.4 Figure 5 is obtained by taking the logarithm of the conversion factor λ = (K/ Kτ)0.127 of formula (2), i.e.. It is used to obtain the conversion factor λ of various types of test pieces. It shall operate as follows. a) calculate the proportionality coefficients K = L0/ඥ𝑆 and Kτ = L0τ/ඥ𝑆ఛ for two test pieces; b) read the conversion factor λ from Figure 5, that is, find K on the abscissa, find Kτ on the ordinate, and the value corresponding to the oblique line passing through the intersection point is the λ value; c) the elongation obtained is δτ = λ • δ. Example. For 14 mm × 30 mm plate test piece with a cross-sectional area of 600 mm2 and a L0 = 200 mm gauge length, the measured elongation is 24 %. It is to be converted to the elongation of 30 mm × 31 mm with a cross-sectional area of 300 mm2 and a L0τ = 100 mm gauge length. Firstly, obtain K = 200/√600 = 8.16, Kτ = 100/√300 = 5.77. Then, find 8.16 on the abscissa and find 5.77 on the ordinate; the intersection point is between the oblique lines 1.00 and 1.05; λ = 1.04. Finally, δτ = 1.04 × 24 % = 25.0 %, which is rounded off to 25 %. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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