ISO 9477:2023

High-strength cast steels for general engineering and structural purposes

This document specifies requirements for four grades of heat-treated cast carbon and alloy steels for general engineering and structural purposes. In cases where castings are produced by welding component parts together, this document does not cover the welding process or the properties of the weldment. The four steel grades are intended for service at ambient temperature.

Aciers moulés à haute résistance pour construction mécanique et construction métallique d'usage général

General Information

• Status: Published
• Publication Date: 08-Nov-2023
• 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: 09-Nov-2023
• Due Date: 17-Nov-2023
• Completion Date: 09-Nov-2023

Relations

• Revises: ISO 9477:2015 - High strength cast steels for general engineering and structural purposes
• Effective Date: 06-Jun-2022

Overview

ISO 9477:2023 is an international standard developed by the International Organization for Standardization (ISO) that specifies requirements for high-strength cast steels used in general engineering and structural applications. This third edition updates previous versions and addresses four grades of heat-treated cast carbon and alloy steels designed for service at ambient temperatures. Notably, the standard excludes welding processes and properties related to welded components.

This standard is essential for manufacturers, engineers, and quality assurance professionals who require precise and reliable specifications for cast steel materials to ensure safety, durability, and performance in structural and mechanical applications.

Key Topics

• Scope and Grades: Defines four grades of heat-treated cast steels chosen for general engineering and structural use. The focus is on ambient temperature applications.
• Chemical Requirements: Sets maximum limits for sulphur (0.025%) and phosphorus (0.030%) content, with the possibility of agreeing on specific alloy compositions and carbon equivalents between manufacturer and purchaser.
• Mechanical Properties: Provides mandatory mechanical property criteria including tensile strength, yield strength, elongation, reduction of area, and impact energy, based on 28-mm thick test blocks. Manufacturers have discretionary tests to confirm reduction of area or impact strength.
• Heat Treatment: Leaves heat treatment methods to the manufacturer’s discretion unless specifically requested by the purchaser.
• Delivery Conditions: Requires conformance with ISO 4990:2023 for general technical delivery conditions relating to steel castings.
• Supplementary Requirements: Allows additional requirements to be agreed between purchaser and manufacturer as specified in ISO 4990.

Applications

ISO 9477:2023 cast steel grades are broadly applicable in:

• General Mechanical Engineering: Components that require strong, durable cast steels able to sustain structural loads at normal operating temperatures.
• Structural Engineering: Load-bearing structural parts in construction and infrastructure projects.
• Heavy Machinery: Cast parts subject to mechanical stress where material performance and reliability are essential.
• Replacement and Repair: When welding cast steel parts, this standard helps define the base steel properties, although it excludes weld joint properties.
• Quality Assurance: Sets benchmarks for steel quality and testing protocols, enabling consistency across manufacturing and procurement worldwide.

Related Standards

• ISO 4990:2023 - Steel Castings - General Technical Delivery Requirements
  Provides overarching technical delivery conditions relevant to cast steels, including supplementary requirements referenced in ISO 9477.

• ISO/IEC Directives - Outline procedures for ISO standard development and maintenance, ensuring ISO 9477 aligns with international best practices.

• ISO Online Browsing Platform and IEC Electropedia: Useful resources for terminology related to steel and metal casting standardization, helping practitioners understand precise definitions and terms used in ISO 9477.

---

Keywords: ISO 9477, high-strength cast steels, heat-treated cast steel, alloy steels, structural steel standards, mechanical properties, cast steel specification, general engineering steel, steel castings, ambient temperature steel, steel chemical composition, mechanical testing, ISO steel standards.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 9477
Third edition
2023-11
High-strength cast steels for general
engineering and structural purposes
Aciers moulés à haute résistance pour construction mécanique et
construction métallique d'usage général
Reference number
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General conditions for delivery . 1
5 Heat treatment .1
6 Chemical requirements . 1
7 Mechanical properties .2
8 Supplementary requirements . 2
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barr
...