Detail of GB/T 31946-2015

Introduction of GB/T 31946-2015

1 Scope This standard specifies expression methods of designation, order contents, dimension, shape, weight and permissible deviation, technical requirements, test methods, inspection rules as well as packaging, marking and certification of steel plates for steel penstock in hydropower station. This standard is applicable to steel plates (with thickness of 12 mm~150 mm) for steel penstock, volute and branch pipe in hydropower station (hereafter referred to as "steel plates"). 2 Normative References The 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 Permissible Tolerances for Chemical Composition of Steel Products GB/T 223.3 Methods for Chemical Analysis of Iron, Steel and Alloy - the Diantipyrylmethane Phosphomolybdate Gravimetric Method for the Determination of Phosphorus Content GB/T 223.11 Iron Steel and Alloy - Determination of Chromium Content - Visual Titration or Potentiometric Titration Method 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 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 223.19 Methods for Chemical Analysis of Iron, Steel and Alloy - the Neocuproine-chloroform Extraction Photometric Method for the Determination of Copper Content GB/T 223.23 Iron Steel and Alloy - Determination of Nickel Content - the Dimethylglyoxime Spectrophotometric Method GB/T 223.26 Iron Steel and Alloy - Determination of Molybdenum Content - the Thiocyanate Spectrophotometric Method GB/T 223.40 Iron, Steel and Alloy - Determination of Niobium Content by the Sulphochlorophenol S Spectrophotometric Method GB/T 223.54 Methods for Chemical Analysis of Iron, Steel and Alloy - the Flame Atomic Absorption Spectrophotometric Method for the Determination of Nickel Content GB/T 223.58 Methods for Chemical Analysis of Iron, Steel and Alloy - the Sodium Arsenite-sodium Nitrite Titrimetric Method for the Determination of Manganese Content GB/T 223.59 Iron, Steel and Alloy - Determination of Phosphorus Content - Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony Phosphomolybdate Blue Spectrophotometric Method GB/T 223.60 Methods for Chemical Analysis of Iron, Steel and Alloy the Perchloric Acid Dehydration Gravimetric Method for the Determination of Silicon Content GB/T 223.61 Methods for Chemical Analysis of Iron, Steel and Alloy - the Ammonium Phosphomolybdate Volumetric Method for the Determination of Phosphorus Content GB/T 223.62 Methods for Chemical Analysis of Iron, Steel and Alloy - the Butyl Acetate Extraction Photometric Method for the Determination of Phosphorus Content GB/T 223.63 Methods for Chemical Analysis of Iron Steel and Alloy - the Sodium (Potassium) Periodate Photometric Method for the Determination of Manganese Content GB/T 223.64 Iron Steel and Alloy - Determination of Manganese Content - Flame Atomic Absorption Spectrometric Method GB/T 223.67 Iron Steel and Alloy - Determination of Sulfur Content - Methylene Blue Spectrophotometric Method GB/T 223.68 Methods for Chemical Analysis of Iron, Steel and Alloy the Potassium Iodate Titration Method after Combustion in the Pipe Furnace for the Determination of Sulfur Content GB/T 223.69 Iron, Steel and Alloy - Determination of Carbon Contents - Gas-volumetric Method after Combustion in the Pipe Furnace GB/T 223.71 Methods for Chemical Analysis of Iron, Steel and Alloy - the Gravimetric Method after Combustion in the Pipe Furnace for the Determination of Carbon Content GB/T 223.72 Iron Steel and Alloy - Determination of Sulfur Content - Gravimetric Method GB/T 223.74 Methods for Chemical Analysis of Iron, Steel and Alloy - the Combustion Gravimetric/ Gas-volumetric Method for the Determination of Combined Carbon Content GB/T 223.75 Iron, Steel and Alloy - Determination of Boron Content - Methanol Distillation - Curcumin Photometric Method GB/T 223.76 Methods for Chemical Analysis of Iron, Steel and Alloy - the Flame Atomic Absorption Spectrometric Method for the Determination of Vanadium Content GB/T 228.1 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room Temperature GB/T 229 Metallic Materials - Charpy Pendulum Impact Test Method GB/T 232 Metallic Materials - Bend Test GB/T 247 General Rule of Package Mark and Certification for Steel Plates (Sheets) and Strips GB/T 709-2006 Dimension, Shape, Weight and Tolerances for Hot-rolled Steel Plates and Sheets GB/T 2970 Thicker Steel Plates - Method for Ultrasonic Inspection GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for Mechanical Testing GB/T 4160 Steel - Strain Ageing Sensibility Test (Charpy Impact Method) GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission Spectrometric Analysis of Carbon and Low-alloy steel (Routine Method) GB/T 5313 Steel Plate with Through-thickness Characteristics GB/T 8170 Rules of Rounding of for Numerical Values & Expression and Judgement of Limiting Values GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements 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 (Routine Method) GB/T 20125 Low-alloy steel - Determination of Multi-element Contents - Inductively Coupled Plasma Atomic Emission Spectrometric Method GB/T 28297 Thicker Steel Plates - Method for Automatic Ultrasonic Testing 3 Expression Methods of Designation Steel designation is composed of 4 parts, i.e., the initial of the Chinese phonetic alphabet "Qu" which represents yield strength, the lower limit of the yield strength, initial of the Chinese phonetic alphabet "Shui" which represents hydropower and steel quality grade symbol. For example, Q490SD, where: Q——the initial of the Chinese phonetic alphabet "Qu" (yield in meaning) in yield strength; 490——the specified minimum yield strength, MPa; S——initial of the Chinese syllable of "Shui", which represents hydropower; D——the quality grade is Grade D. Where the demander requires the steel plate to have through-thickness characteristic, the symbol representing the through-thickness (Z-direction) characteristic grade shall be added in the above-mentioned designation, for example: Q490SDZ35.

Contents of GB/T 31946-2015

Foreword i 1 Scope 2 Normative References 3 Expression Methods of Designation 4 Order Content 5 Dimension, Shape, Weight and Permissible Deviation 6 Technical Requirements 7 Test Methods 8 Inspection Rules 9 Packaging, Marking and Certification