GB/T 28559-2025Supercritical and ultra-supercritical turbine — Blades (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document replaces GB/T 28559-2012 "Supercritical and ultra-supercritical steam turbine blades" and is consistent with GB/T 28559-2012.

In addition to structural adjustments and editorial changes, the main technical changes are as follows.

a) Forgings were deleted from the scope (see Chapter 1 of the 2012 edition);

b) The term and definition of “guide vane” have been deleted (see 3.4 of the 2012 edition);

c) The definitions of “straight blades” and “twisted blades” have been changed (see 3.4, 3.5, 3.5 and 3.6 of the 2012 edition);

d) Added the definitions of "tension bar", "throat width" and "welded stationary blade" (see 3.9 to 3.11);

e) The requirements for aerodynamic design have been changed (see 4.1, 4.1 of the 2012 edition);

f) Added structural design requirements (see 4.2);

g) The strength verification content has been changed (see 4.3, 4.2 of the 2012 edition);

h) The requirements for blade protection measures have been changed (see 4.4, 5.2 of the 2012 edition);

i) The requirements for the selection of steel materials for steam turbine blades have been changed (see Chapter 5, Chapter 5 of the 2012 edition);

j) The requirements for blade forgings have been deleted (see Chapter 6 of the 2012 edition);

k) Added requirements for CNC milling of stationary blades (see Chapter 6);

l) The requirements for CNC milling of moving blades have been changed (see Chapter 6, Chapter 8 of the 2012 edition);

m) The manufacturing requirements for welded stationary blades have been changed (see Chapter 7, Chapter 7 of the 2012 edition);

n) The test methods and inspection rules have been changed (see Chapter 8, Chapter 9 of the 2012 edition);

o) The reference documents for labeling, packaging and quality certification have been changed (see 9.1, 10.1 of the 2012 edition);

p) Changed the clearance between the inner and outer radial surfaces of the CNC milled straight blade assembly and the test sample (see A.1, A.1, 2012 edition A.2);

q) The clearance between the inner and outer radial surfaces of welded straight blades and the profile of the inspection sample has been changed (see C.1, C.1 and C.2 of the 2012 edition).

Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.

This document was proposed by the China Electrical Equipment Industry Association.

This document is under the jurisdiction of the National Technical Committee for Standardization of Steam Turbines (SAC/TC172).

This document was drafted by: Harbin Steam Turbine Works Co., Ltd., Shanghai Power Generation Equipment Complete Design Institute Co., Ltd., Dongfang Steam Turbine Co., Ltd. of Shanghai Electric Power Plant Equipment Co., Ltd. Shanghai Steam Turbine Factory, Beijing Beizhong Steam Turbine and Electric Machine Co., Ltd.

Ren Company, Wuxi Turbine Blade Co., Ltd.

The main drafters of this document are Liu Yunfeng, Yang Yu, Liu Changchun, Guo Pengfei, Li Yin, Song Jingjing, Ma Xin and Wang Jin.

The previous versions of this document and the documents it replaces are as follows.

— First published in 2012 as GB/T 28559-2012;

— This is the first revision.

1 Scope

This document specifies the general requirements, materials and manufacturing requirements for the static and dynamic blades of supercritical and ultra-supercritical steam turbines, and describes the corresponding test It specifies the testing methods and packaging and labeling requirements.

This document is applicable to the manufacture of supercritical and ultra-supercritical steam turbine static and dynamic blades. Follow the instructions.

Note 1.Supercritical steam turbine refers to a steam turbine whose steam parameters exceed the critical pressure and temperature of water (the critical temperature of water is 374.15°C and the critical pressure is 22.129MPa).

Note 2.Ultra-supercritical steam turbine refers to a turbine with steam parameters higher than the conventional supercritical parameters of 24.2MPa/566°C/566°C, and its fresh steam temperature and/or reheat steam temperature Steam turbine with a temperature greater than or equal to 580°C, and/or a new steam pressure greater than or equal to 28MPa.

2 Normative references

GB/T 2900.46

GB/T 8732

GB/T 28558

3 Terms and definitions

The terms and definitions defined in GB/T 2900.46, GB/T 28558 and the following apply to this document.