ISO 21452:2025 PDF

Name: ISO 21452:2025 — Specification and requirements of thermal spray coatings for power plant boiler tubes
SKU: ISO 21452:2025
Price: 25 EUR
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Specification and requirements of thermal spray coatings for power plant boiler tubes

Название (английский):

ISO 21452:2025

Specification and requirements of thermal spray coatings for power plant boiler tubes

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 11 марта 2025 г.
Издание:: ISO IS 21452 edition 1 version 1
ICS:: 25.220.20

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Описание (английский):

This document specifies the procedure and requirements of thermal sprayed coatings for water walls and superheaters of coal-fired and biomass boilers involving the selection of coating materials, pre-treatment, 12/15CrMoV steel substrate preparation and post-treatment as well as the quality and performance evaluation of the coatings.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 21452:2025 - Specification and requirements of thermal spray coatings for power plant boiler tubes - provides standardized procedures and performance requirements for applying thermal-sprayed coatings to water walls and superheaters in coal-fired and biomass boilers. The standard covers selection of coating materials, substrate preparation for 12/15CrMoV steel, pre-treatment, thermal spraying and post-treatment (including sealing and heat treatment), plus coating quality and performance evaluation.

Key topics and requirements

Scope: Coatings for water wall and superheater tubes in coal-fired and biomass boilers; focuses on corrosion, wear, coking and fatigue mitigation.

Recommended coating materials: Examples include NiCrTi, NiCr–CrC, FeCrBMoC, NiCrBSi and NiCrMoNb matched to failure modes and tube types.

Substrate and pre-treatment:

Surface cleaning: alkali washing and acid pickling (procedures provided) to remove grease, scale and weld impurities.
Surface roughening: dry sandblasting with specified abrasive grain sizes and target roughness (Ra ~5.4–6.0 µm); controlled blast pressures and storage time prior to spraying.

Thermal spraying process controls:

Follow ISO 14918 / ISO 14921 practices for sprayer qualification and process.
Spray sequencing (edges/arcs first), gun motion guidance, and substrate temperature limits (not to exceed 200 °C; cool to ≤80 °C if needed).

Post-processing:

Sealing of pores immediately after spraying; sealants rated for high temperature (400–600 °C).
Inspection for thickness, roughness, microhardness and bond strength.

Performance metrics and testing:

Defined performance indicators such as microhardness, porosity, thermal conductivity, hot-corrosion kinetics and erosive wear rates with recommended ranges by tube type.
Test methods referenced: Vickers microhardness (ISO 6507-1), bond strength (ISO 14916), and other evaluation methods.

Applications and users

Who uses ISO 21452:2025:

Power plant engineers and boiler maintenance teams
Thermal spray contractors and coating suppliers
Boiler manufacturers, plant reliability and asset managers
Test laboratories and certification bodies

Practical value:

Extends tube service life and reduces unplanned outages by selecting appropriate coatings and process controls
Provides measurable acceptance criteria for coating quality and in-service performance
Enables consistent supplier qualification and coating verification across the power generation sector

Related standards

ISO 14918, ISO 14921, ISO 14916 (thermal spraying qualification and bond testing)

ISO 6507-1 (Vickers hardness)

ISO 3233-1, ISO 11357-4, ISO 13826 (referenced test and material methods)

Keywords: ISO 21452:2025, thermal spray coatings, boiler tubes, power plant, 12/15CrMoV steel, water wall, superheater, coating quality, hot corrosion, erosion resistance.

ISO 21452:2025 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

Related standards

Технические детали

SIST EN ISO 14918:2018

Thermal spraying - Qualification testing of thermal sprayers (ISO 14918:2018)

SIST EN ISO 14921:2012

Thermal spraying - Procedures for the application of thermally sprayed coatings for engineering components (I…

SIST EN ISO 6507-1:2023

Metallic materials - Vickers hardness test - Part 1: Test method (ISO 6507-1:2023)

SIST EN ISO 14916:2017

Thermal spraying - Determination of tensile adhesive strength (ISO 14916:2017)

SIST EN ISO 3233-1:2020

Paints and varnishes - Determination of percentage volume of non-volatile matter - Part 1: Method using a coa…

BS EN ISO 11357-4:2021

Plastics. Differential scanning calorimetry (DSC). Determination of specific heat capacity.

ISO 13826:2013

Metallic and other inorganic coatings — Determination of thermal diffusivity of thermally sprayed ceramic coa…