GB/T 31303-2014 PDF EnglishUS$255.00 · In stock · Download in 9 seconds
GB/T 31303-2014: Austenitic-Ferritic duplex stainless steel bars 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 31303-2014: Austenitic-Ferritic duplex stainless steel bars---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/GBT31303-2014GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.20 H 44 Austenitic-Ferritic Duplex Stainless Steel Bars ISSUED ON: DECEMBER 5, 2014 IMPLEMENTED ON: SEPTEMBER 1, 2015 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative References ... 4 3 Ordering Contents ... 7 4 Classification and Code ... 8 5 Dimensions, Shape, Weight and Allowable Deviations ... 8 6 Technical Requirements ... 9 7 Test Methods ... 15 8 Inspection Rules ... 16 9 Packaging, Marking and Quality Certificate ... 16 Appendix A (Informative) Recommended Heat Treatment System of Austenitic-Ferritic Duplex Stainless Steel Bars ... 17 Appendix B (Informative) Comparison of Designations between this Standard and Other Similar Standards ... 18 Bibliography ... 21 Austenitic-Ferritic Duplex Stainless Steel Bars1 ScopeThis Standard specifies the classification and code, size, shape, weight and allowable deviation, technical requirements, test methods, inspection rules, packaging, marking, and quality certificates of austenitic-ferritic duplex stainless steel bars. This Standard applies to rolled or forged austenitic-ferritic duplex stainless steel bars with dimensions (diameter, side length, thickness or distance of the opposite side) not exceeding 250mm. Austenitic-ferritic duplex stainless steel bars (hereinafter referred to as steel bars) with dimensions (diameter, side length, thickness or distance of the opposite side) greater than 250mm can also be supplied upon negotiation between the supplier and the purchaser.2 Normative ReferencesThe following documents are essential to the application of this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document. 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 diantipyryl methane phosphomolybdate gravimetric method for the determination of phosphorus content GB/T 223.4 Alloyed steel - 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 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual Titration or Potentiometric Titration Method GB/T 223.16 Methods for Chemical Analysis of Iron, Steel and Alloy - The Chromotropic Acid Photometric Method for the Determination of Titanium Content 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 2101 General provisions on acceptance, package, marking and quality certificate for profile steel GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for Mechanical Testing GB/T 4162 Forged and Rolled Steel Bars - Method for Ultrasonic Testing GB/T 4334 Corrosion of metals and alloys - Test methods for intergranular corrosion of stainless steels GB/T 7736 Ultrasonic inspecting method for macro-structure and imperfection of steel GB/T 10121 Steel products-Method for magnetic particle inspection of tower sample GB/T 10561-2005 Steel - Determination of Content of Nonmetallic Inclusions - Micrographic Method Using Standards Diagrams GB/T 11170 Stainless steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (Routine method) GB/T 13305 Austenitic stainless steels - Determination of area content of the α-phase - Micrographic method using STANDARD diagrams GB/T 15711 Steel Products - Method for Etch Test of Tower Sample GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements GB/T 17897 Test of pitting corrosion resistance of stainless steels in the ferric chloride solution GB/T 20066 Steel and Iron - Sampling and Preparation of Samples for the Determination of Chemical Composition GB/T 20123 Steel and iron - Determination of total carbon and sulfur content Infrared absorption method after combustion in an induction furnace (routine method) GB/T 20124 Steel and iron - Determination of nitrogen content - Thermal conductimetric method after fusion in a current of inert gas YB/T 5293 Metallic materials - Forging test3 Ordering ContentsThe contract or order for ordering according to this Standard shall include the following contents: a) Standard number; b) Product name; c) Designation; d) Dimensions; e) Weight; f) The used processing method (see Clause 4); g) Delivery status; h) Special requirements.4 Classification and Code4.1 Steel bars are divided into the following two categories according to the processing method: a) Steel for pressure processing UP 1) Hot pressure processing UHP 2) Steel for hot forging UHF b) Steel for cutting UC 4.2 The processing method of steel bars shall be specified in the contract. If not specified, they will be supplied as steel for pressure processing.5 Dimensions, Shape, Weight and Allowable Deviations5.1 The dimensions, shape and allowable deviations of rolled steel bars shall comply with the provisions of GB/T 702-2008, and the specific requirements shall be specified in the contract. If not specified, Group 2 of GB/T 702-2008 shall apply. 5.2 The dimensions, shape and allowable deviations of forged steel bars shall comply with the provisions of GB/T 908-2008, and the specific requirements shall be specified in the contract. If not specified, Group 2 of GB/T 908-2008 shall apply. 5.3 The delivery length of steel bars shall usually be 2000mm~12000mm; after negotiation between the supplier and the purchaser and specified in the contract, it can also be delivered in fixed length or multiple lengths. The allowable deviation of the length of rolled steel bars is +50mm 0mm , and the allowable deviation of the length of forged steel bars is +80mm 0mm . 5.4 Steel bars are usually delivered according to actual weight.6 Technical Requirements6.1 Designation and chemical composition of steel 6.1.1 The designation and chemical composition (melting analysis) of steel shall comply with the provisions of Table 1. 6.1.2 The allowable deviation of the chemical composition of the finished steel bar shall comply with the provisions of GB/T 222. 6.2 Steel smelting method Steel shall be smelted by refining outside the furnace, or by electroslag remelting or other smelting methods that meet the requirements of this Standard. When the purchaser specifies a certain smelting method, it shall be indicated in the contract. 6.3 Delivery status Steel bars shall be delivered in a heat-treated state. If not specified in the contract, they shall be delivered in a non-heat-treated state. The recommended heat treatment system for steel bars is shown in Table A.1. Other heat treatment systems may also be used after consultation between the supplier and the purchaser, and indicated in the contract. 6.4 Mechanical properties 6.4.1 The heat treatment system for steel bars or specimens shall refer to the provisions of Table A.1. The size (diameter or side length) of the specimen blank for heat treatment is generally 25mm. When the steel bar size (diameter or side length) is less than 25mm, the original size steel bar shall be used for heat treatment. 6.4.2 For heat-treated steel bars, the specimens shall not be subjected to heat treatment again, and their mechanical properties shall comply with the provisions of Table 2. 6.4.3 For non-heat-treated steel bars, the mechanical properties of the specimen blanks shall comply with the provisions of Table 2 after heat treatment. 6.4.4 Mechanical properties of steel bars for pressure processing are not tested. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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