IS 17111 : 2025/ISO 683-17 : 2023 Heat-Treatable Steels, Alloy Steels and Free-Cutting Steels - Ball and Roller Bearing Steels

ICS 21.100.20; 77.140.10

MTD 16

(Superseding IS 4398 : 1994)

Revised Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard (First Revision) which is identical to ISO 683-17 : 2023 'Heat-treatable steels, alloy steels and free-cutting steels - Part 17: Ball and roller bearing steels' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Alloy Steel and Forging Sectional Committee and approval of the Metallurgical Engineering Division Council.

This standard was first published in 2019 and this revision has been undertaken to align with the latest version of ISO 683-17 to harmonize it with the latest developments that have taken place at international level.

This revision of IS 17111 replaces IS 17111 : 2019 'Heat-treatable steels, alloy steels and free-cutting steels - Ball and roller bearing steels' and IS 4398 : 1994 'Carbon - Chromium steel for the manufacture of balls, rollers and bearing races - Specification (second revision) '. IS 4398 shall stand withdrawn subsequently.

The main changes are as follows:

a) Induction hardening steel 50CrMo4 and stainless steel X30CrMoN15-1 were added;

b) Requirements for Ca and Ti content have been added for through-hardening bearing steels;

c) Requirements for O content have been further restricted for through-hardening and induction hardening bearing steels;

d) Option for H content for premium bearing steels has been added for through-hardening, case hardening and induction-hardening bearing steels; and

e) Option for verification of microscopic inclusions in Table A.1 for through-hardening bearing steels has been revised.

The text of ISO standard has been approved as suitable for publication as in Indian Standard without deviations. Certain terminologies and conventions are, however, not identical with those used in Indian Standard. Attention is especially drawn to the following:

a) Wherever the words 'International Standard' appear referring to this standard, it should be read as 'Indian Standard'; and

b) Comma (,) has been used as a decimal marker while in Indian Standards the current practice is to use a point (.) as the decimal marker.