NB/T 20010.5-2010PWR nuclear power plant valve - Part 5: Specification of austenitic stainless steel forgings (English PDF)

1 Scope

This standard specifies the technical requirements of austenitic stainless steel pressure forgings (hereinafter referred to as "forgings") of nuclear safety related valves used in PWR nuclear power plant.

This standard is applicable to forgings (valve body, valve deck, valve clack, etc.) of Grades 1, 2, 3 valves used in PWR nuclear power plant. It also applies as a reference for forgings of non-nuclear class valves used for nuclear purposes.

This part is not applicable to valve rods and fasteners.

2 Normative References

The following documents are indispensable to the application this document. For dated references, only the dated edition applies; for undated references, the latest edition (including all the amendments) applies.

GB/T 223 (All Parts) Methods for Chemical Analysis of Iron, Steel and Alloy

GB/T 228-2002 Metallic Materials-Tensile Testing at Ambient Temperature (ISO 6892:1998, MOD)

GB/T 229-2007 Metallic Materials - Charpy Pendulum Impact Test Method (ISO 148-1: 2006, MOD)

GB/T 4334.5 Method of Copper Sulfate - Sulfuric Acid Test for Stainless Steels

GB/T 4338-2006 Metallic Materials - Tensile Testing at Elevated Temperature (GB/T 4338-2006, ISO 783:1999, MOD)

GB/T 6394 Metal - Methods for Estimating the Average Grain Size (GB/T 6394-2002, ASTM E112:1996, MOD)

GB/T 10561 Determination of Content of Nonmetallic Inclusions in Steel - Micrographic Method Using Standards Diagrams (GB/T 10561-2005, ISO 4967: 1998, IDT)

GB/T 11170 Method for Photoelectric Emission Spectroscopic Analysis of Stainless Steel

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)

EJ/T 1040 Physical and Chemical Test Methods for Materials Used in Nuclear Island Mechanical Equipment of Nuclear Power Plants

NB/T 20003 Non-destructive Testing for Mechanical Components in Nuclear Island of Nuclear Power Plants

ASTM A745/A745M Standard Practice for Ultrasonic Examination of Austenitic Steel Forgings

ASTM E 165 Standard Test Method for Liquid Penetrant Examination

3 Forging Steel

Steel used for valve forgings shall be smelted as follows:

a) Electric furnace (with separate degasification and additional refinement);

b) Vacuum furnace;