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GB/T 14985-2007: General rules of dimensions, shape, surface, quality, testing method and inspection for expansion alloys Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 14985: Historical versions
Similar standardsGB/T 14985-2007: General rules of dimensions, shape, surface, quality, testing method and inspection for expansion alloys---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/GBT14985-2007 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.99 H 58 Replacing GB/T 14985-1994 General rules of dimensions, shape, surface, quality, testing method and inspection for expansion alloys Issued on. AUGUST 14, 2007 Implemented on. MARCH 01, 2008 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Order content... 7 4 Dimensions, shapes and allowable deviations... 8 5 Surface quality... 12 6 Testing methods... 12 7 Inspection rules... 13 8 Packaging, marks and quality certificate... 14 Annex A (normative) Inspection method for expansion alloy phase transformation.. 15ForewordThis Standard replaces GB/T 14985-1994 "General rules of dimensions, shape, surface quality, test method and inspection for expansion alloys". Compared with GB/T 14985-1994, the main changes in this Standard are as follows. - Add "Normative references" and "Order content"; - Revise the allowable deviation for dimension and shape regulations of cold-drawn (pulled) wire to directly refer to the relevant content in GB/T 342; - Revise the provisions of "higher precision and ordinary precision" in the allowable deviation of cold rolled strip thickness dimensions in GB/T 14985-1994 to that it shall be carried out according to the provisions of width ≥ 150 mm and width ≤ 150 mm. Modify the original negative deviation to positive and negative deviation; - Revise the allowable deviation for dimension and shape regulations of cold drawn and polished rods to directly refer to the relevant content in GB/T 3207; - Revise the allowable deviation for dimension of hot forged materials to directly refer to the relevant content in GB/T 908.For the 20 mm ~ < 50 mm hot forged materials not included in GB/T 908, it is revised to "the allowable diameter deviation of 20 mm ~ < 50 mm hot forged materials is +1.5 mm, -0.5 mm"; For the allowable deviation of the diameter of the hot forged material ≥50 mm, the accuracy requirements in Table 2 of GB/T 908 shall be directly quoted; - Revise the allowable deviation for dimension and shape regulations of hot rolled bars to directly refer to the relevant content in GB/T 702; - Delete the words "peeling, burrs, etc. that affect the use" from the surface quality in GB/T 14985-1994; - In Table 4, add the note "The air tightness test shall be carried out by the buyer. The thickness of the specimen to be tested shall be specified in the contract, otherwise the test shall be carried out according to the specimen grade A specified in GB/T 5778 "; - In Chapter 7, add the content "if the size, shape and surface quality are unqualified, it is a substandard product"; - Add " 8 Packaging, marks and quality certificate". Annex A of this Standard is normative. This Standard was proposed by China Iron and Steel Association. This Standard shall be under the jurisdiction of National Technical Committee of Standardization Administration of China. The drafting organizations of this Standard. Shaanxi Precision Alloy Co., Ltd., Shanghai Iron and Steel Research Institute. Main drafters of this Standard. Zhang Ailing, Liu Yongqing. Versions of standard substituted by this document are. GBn100-1981, GBn100-1987, GB/T 14985-1994. General rules of dimensions, shape, surface quality, testing method and inspection for expansion alloys1 ScopeThis Standard specifies the dimensions, shape and allowable deviation, surface quality, testing methods, inspection rules, packaging, marks and quality certificates for expansion alloys. This Standard applies to expansion alloys with a certain average linear expansion coefficient within a certain temperature range.2 Normative referencesThe provisions in following documents become the provisions of this Standard through reference in this Standard. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Standard, however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/T 222, Permissible tolerances for chemical composition of steel products GB/T 223.3, Methods for chemical analysis of iron, steel and alloy. The daintily methane phosphomolybdate gravimetric method for the determination of phosphorus content GB/T 223.4, Iron, steel and alloy - Determination of manganese content - Potentiometric or visual titration method GB/T 223.5, Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method GB/T 223.9, Iron, steel and alloy - Determination of aluminium content - Chrome azurol S photometric method GB/T 223.11, Iron, steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method GB/T 223.17, Methods for chemical analysis of iron, steel and alloy - The diantipyrylmethane photometric method for the determination of titanium content GB/T 223.18, Methods for chemical analysis of iron steel and alloy - The sodium thiosulfate separation iodometric method for the determination of copper content GB/T 223.20, Methods for chemical analysis of iron steel and alloy - The Potentiometric titration method for the determination of cobalt content3 Order contentThe contract or order for ordering according to this Standard shall include the followings.4 Dimensions, shapes and allowable deviations4.1 Cold drawn (pulled) wires 4.1.1 Dimension and allowable deviation The diameter of cold drawn (pulled) wire is. 0.10 mm ~ 7.00 mm. The allowable deviation of its diameter shall comply with the precision requirements in Table 2 or Table 3 in GB/T 342-1997.The accuracy grade should be specified in the contract. When not specified, it is provided with grade 10 accuracy. 4.2 Cold rolled (drawn) pipes 4.2.1 Dimension and allowable deviation 4.2.1.1 Outer diameter and allowable deviation for inner-outer diameters, wall thickness The outer diameter and allowable deviation for inner and outer diameters, wall thickness of cold rolled (drawn) seamless pipes shall comply with the regulations of Table 1.Other specifications and size tolerances are negotiated between the supplier and the buyer. 4.2.2 Shape 4.2.2.1 The curvature per meter of the pipe is not greater than 2 mm. The total curvature is not greater than 0.2% of the total length. 4.3 Cold rolled strips 4.3.1 Dimension and allowable deviation 4.3.2 Shape 4.3.2.1 Strips with a thickness not greater than 1.5 mm shall be delivered in rolls. If the buyer requires delivery in straight strips or in fixed lengths and multiples, it should be specified in the contract. 4.4 Cold drawn and polished bars 4.4.1 Dimension and allowable deviation Diameter of cold drawn and polished bars. 1.0 mm ~ 40.0 mm. The allowable diameter deviation should meet the accuracy requirements of 9(9h), 10(10h) and 11(11h) in Table 2 of GB/T 3207-1988.The accuracy grade should be specified in the contract. When not specified, it is provided according to grade 11 accuracy. 4.5 Hot forged material 4.5.1 Dimension and allowable deviation Dimensions and allowable deviations of hot forged materials shall comply with the provisions in Table 3. 4.5.2 Shape 4.5.2.1 The out-of-roundness of round steel should not exceed half of the diameter tolerance. The diagonal length of the square steel shall not be less than 1.4 times the lower limit of the side length. 4.6 Hot rolled material 4.6.1 Dimension and allowable deviation5 Surface quality5.1 Cold rolled (pulled, drawn, polished) material The surface of cold rolled (pulled, drawn, polished) materials should be smooth. Defects such as microcracks, delamination, folds, scars, rust, scratches, oxidized colors, and pitting are not allowed.6 Testing methodsThe testing methods for the performance inspection of each batch of alloys shall be carried out in accordance with the provisions in Table 5.7 Inspection rules7.1 Inspection and acceptance The inspection and acceptance of finished products shall be carried out by the quality and technical supervision department of the supplier. 7.2 Batching rules Finished products should be submitted in batches for inspection and acceptance. Each batch consists of alloy materials with the same alloy designation, the same furnace (tank) number, the same processing method, the same size, the same delivery state, and the same heat treatment system. 7.4 Reinspection and judgement rules 7.4.1 If the inspection results of the expansion coefficient are unqualified, double the number of samples should be taken for reinspection. Even if one sample is unqualified in the reinspection results, this furnace of alloys shall be rejected. 7.4.4 When the user requests to test the airtightness of alloy materials, each batch of alloy materials shall be managed according to A and B heads. 7.4.5 If the dimension, shape and surface quality are unqualified, it will be judged as unqualified product. 7.4.6 If the results of other inspections are unqualified, double the number of specimens should be taken for reinspection of the unqualified items. If the reinspection results are still unqualified, then this batch of alloys shall be rejected.8 Packaging, marks and quality certificateThe packaging, marks and quality certificate of finished alloy materials shall comply with the relevant provisions of GB/T 13297.Annex A(normative) Inspection method for expansion alloy phase transformation A.1 Scope This method is applicable to the phase transformation inspection of expansion alloys such as 4J29, 4J34, 4J40, 4J32 and 4J28. A.2 Test principle Put the specimen in a container. Freeze at a certain temperature. After a certain freezing time, measure the γ→α martensitic transformation. A.3 Specimen A.3.1 Specimen cutting A.3.2 Grinding of specimens Diameter (side length) ≤ 20mm Diameter >20~60 mm Diameter >60 mm Side length >60 mm (Specimen thickness is 10 mm) A.3.3 Polishing of specimens A.3.3.1 The polished side of the specimen shall be a complete section. Longitudinal sections can also be used, but the inspection area must be guaranteed. A.3.3.2 Polishing is the last process of specimen grinding. Its purpose is to eliminate the fine wear marks after fine grinding and obtain a bright mirror surface without wear marks. The method uses electrolytic polishing. Commonly used electrolytic polishing fluids and electrolytic specifications are shown in Table A.1. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 14985-2007 be delivered?Answer: The full copy PDF of English version of GB/T 14985-2007 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 14985-2007_English with my colleagues?Answer: Yes. 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