ISO 13807:2022

Name: ISO 13807:2022 — Vitreous and porcelain enamels — Determination of crack formation temperature in the thermal shock testing of enamels for the chemical industry
SKU: ISO 13807:2022
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Vitreous and porcelain enamels — Determination of crack formation temperature in the thermal shock testing of enamels for the chemical industry

Название (английский):

ISO 13807:2022

Vitreous and porcelain enamels — Determination of crack formation temperature in the thermal shock testing of enamels for the chemical industry

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 5
Дата публикации:: 14 октября 2022 г.
Издание:: ISO IS 13807 edition 2 version 1
ICS:: 25.220.50

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Описание (английский):

This document specifies a test method for the determination of the crack formation temperature of enamels for the chemical industry by subjecting enamelled steel specimens to thermal shock using cold water. The value of the crack formation temperature measured according to this test method does not apply to the finished component (see Annex A). It is a parameter of vitreous and porcelain enamels for comparing the relative quality of different enamel formulations.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 13807:2022 specifies a laboratory test method to determine the crack formation temperature of vitreous and porcelain enamels used in the chemical industry. The method subjects enamelled steel specimens to a controlled thermal shock - heating in an oven followed by immediate quenching with cold water - and identifies the temperature at which the first enamel cracks or chipping appear. The measured value is a comparative parameter for enamel formulations and does not directly represent the behavior of finished components (see Annex A).

Key topics and technical requirements

Scope and purpose: Test for thermal shock resistance of enamel coatings on steel to determine crack formation temperature for comparing enamel quality.

Definitions:

Crack formation temperature: thermal shock temperature at which the first damage (cracks/chipping) occurs.
Thermal shock temperature: specimen temperature immediately before quenching.

Specimens:

Typical specimen: square steel plate enamelled on one side (edge length 150 mm, thickness ≥ 10 mm) or 10MnTi3 low-alloy enamelling steel with specified nominal composition.
Finished enamel coating thickness: overall 1.1 mm to 1.4 mm (measured per ISO 2178).
Two specimens are used per determination.

Apparatus:

Drying oven capable of ≥ 300 °C.
Low-form beaker (2 000 ml, ISO 3819 compliant) and a spray gun for electrostatically charged talcum powder to reveal fine cracks.

Procedure summary:

Heat specimen to the chosen thermal shock temperature in the oven (about 20 °C below expected crack temperature if known).
Remove specimen and quench by pouring 2 L of water at 10 °C–30 °C onto the enamelled surface within 3 s of opening the oven.
Dry, visually inspect and spray with charged talcum powder to detect cracks.
If no damage, repeat the test at increments of +10 °C; average values within 10 °C are reported.

Preconditioning: Controlled cooling after final firing-heat to 600 °C for ≥ 20 min then cool to 250 °C at ≤ 1 °C/min to reduce residual stresses.

Reporting: Include enamel type, coating thickness, material code, individual crack temperatures (°C), mean value, and deviations from the procedure.

Applications and users

Who uses it: Enamel manufacturers, coating labs, quality control engineers, product developers and procurement teams in the chemical process industry.

Practical applications:

Compare thermal shock resistance of different enamel formulations.
Provide a repeatable lab parameter for R&D and QC of vitreous/porcelain enamels.
Support material selection for equipment where enamel cracking under rapid cooling is a concern.

Limitations: The test parameter is for comparing enamels under controlled lab conditions; it should not be used alone to predict finished-product resistance in service (see informative Annex A).

Related standards

ISO 2178 - Coating thickness measurement (magnetic method)

ISO 2746 - High voltage test for enamels

ISO 3819 - Laboratory glassware - Beakers

ISO 19496-1 - Enamel terminology

Keywords: ISO 13807:2022, thermal shock testing, crack formation temperature, vitreous enamel, porcelain enamel, enamelled steel, chemical industry, enamel testing.

ISO 13807:2022

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

ISO 21787:2006/Amd 1:2019

Industrial valves — Globe valves of thermoplastics materials — Amendment 1

SIST EN ISO 3819:2016

Laboratory glassware - Beakers (ISO 3819:2015)

SIST EN ISO 2746:2016

Vitreous and porcelain enamels - High voltage test (ISO 2746:2015)

SIST EN ISO 19496-1:2017

Vitreous and porcelain enamels - Terminology - Part 1: Terms and definitions (ISO 19496-1:2017)