GB/T 31315-2014 PDF EnglishUS$90.00 · In stock · Download in 9 seconds
GB/T 31315-2014: Cold drawn or cold rolled precision weld steel tubes for mechanical structures Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 31315-2014: Cold drawn or cold rolled precision weld steel tubes for mechanical structures---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/GBT31315-2014GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.75 H 48 Cold drawn or cold rolled precision weld steel tubes for mechanical structures Issued on. DECEMBER 5, 2014 Implemented on. SEPTEMBER 1, 2015 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration Committee. Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Classification, codes... 7 4 Order content... 7 5 Size, shape, weight and tolerance... 7 6 Technical requirements... 11 7 Inspection and test methods... 15 8 Inspection rules... 16 9 Packaging, marks and quality certificates... 17ForewordThis Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard was proposed by China Iron and Steel Association. This Standard shall be under the jurisdiction of National Technical Committee on Steel of Standardization Administration of China (SAC/TC 183). The drafting organizations of this Standard. Jiangsu Zhongyou Precision Tube Co., Ltd., Jiangsu Feng Li Precision Tube Co., Ltd. Main drafters of this Standard. Yao Zhiqiang, Wu Huiti, Ni Zhihong, Jiang Xiaojun, Yu Qingwen. Cold drawn or cold rolled precision weld steel tubes for mechanical structures1 ScopeThis Standard specifies the classification, code, dimension, shape, weight and tolerance, technical requirements, inspection and test methods, inspection rules, packaging, marks and quality certificates of cold drawn or cold rolled precision weld steel tubes for automotive and machinery. This Standard is applicable to the cold drawn or cold rolled precision weld steel tubes with special dimensional accuracy and high surface quality requirements for machinery manufacturing, vehicle manufacturing, furniture and general engineering industries.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 222, Method of sampling steel for determination of chemical composition and permissible variations for product analysis 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 - Chrom azurol S photometric method GB/T 223.11, Iron, Steel and Alloy - Determination of Chromium Content - Visual Titration or Potentiometric Titration Method GB/T 223.12, Methods for chemical analysis of iron, steel and alloy--The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content GB/T 223.14, Methods for Chemical Analysis of Iron, Steel and Alloy - The N-Benzoy-N-Phenylhydroxylamine Extraction Photometric Method for the Determination of Vanadium Content3 Classification, codesThe cold drawn or cold rolled precision weld steel tubes in this Standard are classified into five categories according to delivery status. The classifications and codes are as follows.4 Order contentThe contract or order for the steel pipe ordered according to this Standard shall include the following information.5 Size, shape, weight and tolerance5.1 Outside diameter, inside diameter and wall thickness 5.1.1 Steel pipes are usually delivered in outside diameter and wall thickness. When the buyer requires delivery in outside diameter and inside diameter OR inside diameter and wall thickness, it should be indicated in the contract. 5.2 Length 5.2.1 Normal length The normal length of steel tube is 3000 mm ~ 12000 mm. 5.2.2 Fixed length and double length According to the requirements of the buyer, after negotiation of the seller and the buyer and specified in the contract, steel tubes can be delivered in fixed length or double length. 5.2.3 Other requirements According to the requirements of the buyer, after negotiation of the seller and the buyer and specified in the contract, steel tubes of other length and tolerance can be supplied. 5.3 Degree of curvature 5.3.1 The degree of curvature should not exceed 1.5 mm/m. 5.4 Head shape Both ends of the steel tube should be perpendicular to the tube axis. The incision burr should be removed. 5.5 Non-roundness and uneven wall thickness The non-roundness and uneven wall thickness of steel tube should not be greater than 80% of the outside diameter tolerance and wall thickness tolerance respectively. 5.6 Delivery weight Steel tubes can be delivered in actual weight or theoretical weight. The theoretical weight per meter of steel tube shall be in accordance with GB/T 17395 (the density of the steel is 7.85 kg/dm3).6 Technical requirements6.1 Steel designation and chemical composition 6.2 Manufacturing method 6.2.1 Steel smelting method The steel should be the fully killed steel which uses electric furnace or oxygen converter smelting. 6.2.2 Manufacturing method of steel tube The steel tube should be made by cold drawing or cold rolling or other suitable methods via welding tube. 6.3 Delivery state The steel tube shall be delivered in either of the states listed in Table 3. Table 3 Delivery status 6.5 Process performance 6.5.1 Flattening test Steel tubes with a wall thickness to outer diameter ratio of less than 15% in the +A and +N states shall be subjected to flattening test. The distance H between plates after specimen flattening is calculated according to equation (1). 6.7 Surface roughness When the buyer has requirements for surface roughness of steel tube, it should be indicated in the contract. The parameters of surface roughness shall be determined by the contour arithmetic mean deviation Ra specified in GB/T 1031. Its surface roughness value and the sampling length at the time of measurement shall be determined by the seller and the buyer. 6.8 Surface quality 6.8.1 The inner and outer surfaces of the steel tube should be smooth. The depth of the local pits, scratches and small scratches should not exceed 0.08 mm. The actual wall thickness of these defects shall be not less than the minimum value allowed for wall thickness deviation. cold rolled state are allowed to have phosphate and lubricant adhesion layers from the manufacturing process. 6.8.4 The inner and outer surfaces of steel tubes delivered by heat treatment state are allowed to have oxide film layer which does not affect surface examination but not loose oxide skin.7 Inspection and test methods7.1 The size and shape of steel tube should be measured one by one by the mearing tool which meets the accuracy requirements. 7.2 The inner and outer surfaces of steel tube should be visually inspected one by one under full lighting conditions.8 Inspection rules8.1 Inspection and acceptance The inspection and acceptance of the steel tube shall be carried out by the quality and technical supervision department of the seller. 8.2 Batching rules The steel tubes shall be inspected and accepted in batches. Each batch should consist of steel tubes of same designation, of same furnace number, of same specification and of same heat treatment system (furnace number) or of same delivery state. The quantity of each batch of steel tubes shall not exceed the following provisions. 8.3 Re-inspection and determination rules The re-inspection and determination rules of steel tubes should comply with the provisions of GB/T 2102.9 Packaging, marks and quality certificates9.1 Before steel tubes leave factory, anti-rust treatment should be carried out for inner and outer surfaces. Unless otherwise specified in the contract, it should use neutral oil for anti-rust treatment. 9.2 The marks and quality certificate of steel tube shall meet the requirements of GB/T 2102. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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