ISO 4289:2023

Name: ISO 4289:2023 — High velocity oxygen fuel (HVOF) cermet coatings for metallurgical roll components — Guidance with requirements
SKU: ISO 4289:2023
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High velocity oxygen fuel (HVOF) cermet coatings for metallurgical roll components — Guidance with requirements

Название (английский):

ISO 4289:2023

High velocity oxygen fuel (HVOF) cermet coatings for metallurgical roll components — Guidance with requirements

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 24 февраля 2023 г.
Издание:: ISO IS 4289 edition 1 version 1
ICS:: 25.220.40

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Описание (английский):

This document specifies recommendations and requirements for the selection of coating materials, the pre-treatment of rollers, the preparation and post-treatment of the coatings, as well as the quality and performance evaluation of high velocity oxygen fuel (HVOF) cermet coatings used on metallurgical roll components. This document is applicable to four metallurgical rollers: pot inner roller (sink/stabilizing roller) of continuous galvanized line (CGL), cold rolling process roller, hot-rolled straightening roller and furnace roller.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 4289:2023 - "High velocity oxygen fuel (HVOF) cermet coatings for metallurgical roll components - Guidance with requirements" provides practical recommendations and mandatory requirements for selecting, applying and evaluating HVOF cermet coatings on key metallurgical rollers. The standard covers material selection, surface pre-treatment, HVOF spraying, post‑processing (sealing, heat treatment, balancing) and quality/performance evaluation for four roller types: pot inner (sink/stabilizing) rollers in continuous galvanizing lines (CGL), cold‑rolling process rollers, hot‑rolled straightening rollers and furnace rollers.

Key topics and technical requirements

Coating selection: Typical HVOF cermet systems include tungsten‑carbide based (WC‑xCo, WC‑xM (NiCr, Co)), chromium‑carbide (CrC‑xNiCr) and high‑temperature MCrAlY + oxides/carbides for furnace applications. The metallic phase fraction (x) is recommended between 10% and 50% by mass.

Surface pre‑treatment:

Remove production residues (e.g., residual zinc on CGL pot rollers) using dilute sulfuric acid (3–7 % mass), immersion 6–72 h, followed by rinsing and drying.
Repair/limit defects: shrinkage cavities/pores <0.5 mm; no pits >3 mm after processing.
Target substrate roughness: initially <3.2 µm; grind/polish to <0.8 µm prior to blasting. Sandblasting is then used to achieve the roughened profile for adhesion.

HVOF application: Spraying shall follow ISO 14921 procedures for thermal spraying.

Post‑process: Seal pores (especially for CGL and furnace rollers) promptly; perform heat treatments and dynamic/static balancing as required. Inspect thickness, roughness, microhardness and bond strength after spraying.

Performance targets (typical ranges reported):

Coating thickness: generally 100–200 µm (application‑dependent)
Bond strength: commonly >65–70 MPa
Porosity: <1 % for many rollers (up to 5 % for ≥800 °C furnace rollers)
Microhardness (Vickers HV0.3): ~600–1 300 HV0.3
Friction coefficient and surface roughness targets vary by roller type (e.g., cold‑rolling friction ~0.23 ± 0.02)

Applications and who should use this standard

ISO 4289:2023 is aimed at:

Metallurgical roll manufacturers and refurbishers

Plant engineers and maintenance teams in steel mills (CGLs, cold/hot rolling, annealing lines)

Thermal spray contractors and coating material suppliers

Quality assurance and testing laboratories Use the standard to specify coating systems, define pre/post‑treatment and set inspection/test methods to increase roller life and maintain strip surface quality.

Related standards

ISO 14921 - Thermal spraying: procedures for application

ISO 14916 - Thermal spraying: tensile adhesive strength

ISO 9220 - Metallographic preparations (referenced for SEM thickness)

ISO/TR 26946 - Porosity evaluation guidance

ISO 8503‑4 - Surface roughness measurement

ISO 6507‑1 and ISO 4545‑1 - Microhardness testing

Keywords: ISO 4289:2023, HVOF cermet coatings, metallurgical rollers, thermal spray, coating thickness, bond strength, porosity, roller surface preparation.

ISO 4289:2023

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and who should use this standard

Related standards

Технические детали

BS EN ISO 14921:2010

Thermal spraying. Procedures for the application of thermally sprayed coatings for engineering components.

BS EN ISO 14916:2017

ENISO 14916 Thermal spraying -- Determination of tensile adhesive strength.

ISO 9220:1988

Metallic coatings — Measurement of coating thickness — Scanning electron microscope method

ISO/TR 26946:2011

Standard method for porosity measurement of thermally sprayed coatings

ISO 8503-4:1988

Preparation of steel substrates before application of paints and related products — Surface roughness charact…

ISO 6507-1:2018

Metallic materials — Vickers hardness test — Part 1: Test method

BS EN ISO 4545-1:2023

Metallic materials. Knoop hardness test. Test method.