Alloy Steel for Pressurized Water Reactor Nuclear Power Plants - Part 14: Forged Nickel-chromium-molybdenum Steel Bars With or Without Vanadium for Use in Making Class 1 Components Bolts Fastener
NB/T 20006.14-2010 Alloy steel for pressurized water reactor nuclear power plants - Part 14: Forged nickel-chromium-molybdenum steel bars with or without vanadium for use in making Class 1 component bolt fasteners
1 Scope
This part specifies the manufacturing, chemical composition, mechanical properties, testing, and examination requirements for materials used in main bolts, nuts, and washers for Class 1 components in pressurized water reactor nuclear power plants.
This part is applicable to forged nickel-chromium-molybdenum steel bars with or without vanadium, designations 40CrNi2MoV and 40CrNi2Mo, with a nominal diameter not exceeding 300 mm, used for main bolts, nuts, and washers for reactor pressure vessels, as well as for bolts and nuts for reactor coolant pump volutes and screws for No.1 seal housings in pressurized water reactor nuclear power plants.
This part may also serve as a reference for manhole bolts and nuts for pressurizers and bolt fasteners for steam generators.
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 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method (GB/T 223.5-2008, ISO 4829-1: 1986, ISO 4829-2: 1988, MOD)
GB/T 223.11 Iron, steel and alloy - Determination of chromium content - Visual titration or potentiometric titration method (GB/T 223.11-2008, ISO 4937: 1986, MOD)
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 223.19 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 Methods for chemical analysis of iron, steel and alloy - The thiocyanate direct photometric method for the determination of molybdenum 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 Methods for chemical analysis of iron, steel and alloy - The reduced molybdoantimonyl phosphoric acid 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 223.68 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 226 Etch test for macrostructure and defect of steels (GB/T 226-1991, neq ISO 4969: 1980)
GB/T 228-2002 Metallic materials - Tensile testing at ambient temperature (eqv ISO 6892: 1998)
GB/T 229 Metallic materials - Charpy pendulum impact test method (GB/T 229-2007, ISO 148-1: 2006, MOD)
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method (GB/T 231.1-2002, eqv ISO 6506-1: 1999)
GB/T 1814 Inspection method for steel work fractures
GB/T 1979-2001 Standard diagrams for macrostructure and defect of structural steels
GB 2101 General requirement of acceptance, packaging, marking and certification for section steel
GB/T 2975 Steel and steel products - Location and preparation of test pieces for mechanical testing (GB/T 2975-1998, eqv ISO 377: 1997)
GB/T 4336 Standard test method for spark discharge atomic emission spectrometric analysis of carbon and low-alloy steel (routine method)
GB/T 4338 Metallic materials - Tensile testing at elevated temperature (GB/T 4338-2006, ISO 783: 1999, MOD)
GB/T 6394-2002 Metal - Methods for estimating the average grain size
GB/T 10561-2005 Steel - Determination of content of nonmetallic inclusions - Micrographic method using standards diagrams (ISO 4967: 1998, IDT)
GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition (GB/T 20066-2006, ISO 14284: 1996, IDT)
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 20123-2006, ISO 15350: 2000, IDT)
NB/T 20003.2-2010 Non-destructive testing for mechanical components in nuclear island of nuclear power plants - Part 2: Ultrasonic testing
NB/T 20003.4 Non-destructive testing for mechanical components in nuclear island of nuclear power plants - Part 4: Penetrant testing
NB/T 20003.5 Non-destructive testing for mechanical components in nuclear island of nuclear power plants - Part 5: Magnetic particle testing
3 Manufacturing
3.1 Manufacturing process specification
Before starting manufacture, the manufacturer shall establish a manufacturing process specification covering the following main contents:
——Steel smelting method;
——Weight and type of steel ingot;
——Percentage of cropping for the head and tail of the steel ingot;
——Location of the forged bar in the steel ingot;
——Diameter of the forged bar during heat treatment and diameter in the delivery condition;
——Processes for intermediate heat treatment, property heat treatment and subsequent stabilization heat treatment;
Contents
Foreword i
1 Scope
2 Normative references
3 Manufacturing
4 Chemical composition
5 Mechanical properties
6 Metallographic examination
7 Surface quality
8 Non-destructive examination
9 Removal and repair of defective areas
10 Dimension inspection
11 Marking
12 Cleaning, packaging and transport
13 Quality certification documents
