GB/T 31946-2015Steel plates for steel penstock in hydropower station (English PDF)

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.