ISO 11971:2020

Steel and iron castings — Visual testing of surface quality

1.1 This document covers the acceptance criteria for the visual testing of the surface of steel and iron castings. 1.2 Acceptance levels utilize Bureau de Normalisation des Industries de la Fonderie (BNIF) and Steel Castings Research and Trade Association (SCRATA) or Casting Technology International (CTI) reference comparators for the visual determination of surface roughness and surface discontinuities described as follows: — surface roughness; — thermal dressing; — mechanical dressing; — non-metallic inclusions; — gas porosity; — fusion discontinuities; — expansion discontinuities; — metal inserts.

Pièces moulées en acier ou en fonte — Contrôle visuel de l'état de surface

General Information

• Status: Published
• Publication Date: 12-Jan-2020
• ICS: 77.040.20 - Non-destructive testing of metals
• ICS: 77.140.80 - Iron and steel castings
• Technical Committee: ISO/TC 17/SC 11 - Steel castings
• Drafting Committee: ISO/TC 17/SC 11 - Steel castings
• Current Stage: 6060 - International Standard published
• Start Date: 13-Jan-2020
• Due Date: 25-Jul-2021
• Completion Date: 13-Jan-2020

Relations

• Revises: ISO 11971:2008 - Steel and iron castings — Visual examination of surface quality
• Effective Date: 23-Apr-2020

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 11971
Third edition
2020-01
Steel and iron castings — Visual
testing of surface quality
Pièces moulées en acier ou en fonte — Contrôle visuel de l'état de
surface
Reference number
ISO 11971:2020(E)
©
ISO 2020

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ISO 11971:2020(E)

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© ISO 2020
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ii © ISO 2020 – All rights reserved

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ISO 11971:2020(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative References . 1
3 Terms and Definitions . 1
4 Ordering information . 1
5 Test method . 2
6 Acceptance criteria . 2
7 Test report . 3
Annex A (informative) . 4
Bibliography . 5
© ISO 2020 – All rights reserved iii

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ISO 11971:2020(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
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iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 11, Steel
castings.
This third edition cancels and replaces the second edition (ISO 11971:2008), which has been technically
revised. The main changes compared to the previous edition are as follows:
— “Normative References” added as new Clause 2 and “Terms and Definitions” added as new Clause 3;
subsequent Clauses were renumbered
— Correction in Clause 5 (previously Clause 3) regarding the use of SCRATA comparators for iron
castings
— Table 3 and Table 4 in the previous edition were moved to new Annex A
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved

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ISO 11971:2020(E)

Introduction
The surface roughness of a casting is influenced by the manufacturing process (moulding, grinding,
finishing, etc.), the moulding materials used (sand, coating, etc.), the equipment available and the
alloy cast.
Since cast surfaces do not exhibit the same cyclic regularity as machined surfaces, it is difficult to
evaluate their roughness using conventional mechanical, optical, or pneumatic devices.
The use of visual/tactile comparators is therefore preferred in these circu
...