GB/T 5617-2005 English PDF (GBT5617-2005)

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GB/T 5617-2005: Determination of effective depth of hardening after induction or flame hardening of steel
GB/T 5617-2005
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.200
J 36
Replacing GB/T 5617-1985
Determination of Effective Depth of Hardening after
Induction or Flame Hardening of Steel
(ISO 3754:1976, NEQ)
ISSUED ON: JULY 21, 2005
IMPLEMENTED ON: JANUARY 1, 2006
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative References ... 5 
3 Terms and Definitions ... 5 
4 General Provisions ... 6 
5 Measurement ... 6 
6 Verification ... 8 
7 Test Report ... 8 
Foreword
The degree of consistency between this Standard and ISO 3754:1976 Steel -
Determination of Effective Depth of Hardening after Flame or Induction Hardening is
non-equivalent.
This Standard was re-drafted in accordance with ISO 3754:1976.
This Standard is an amendment of GB/T 5617-1985 Determination of Effective Depth
of Hardening after Induction or Flame Hardening of Steel.
In accordance with the requirements of GB/T 1.1-2000 Directives for Standardization
- Part 1: Rules for the Structure and Drafting of Standards, this Standard makes
corresponding modifications in structure, formatting and textual expression, such as:
---The code of the international standard being adopted and the degree of
adoption are added to the cover;
---Foreword is added;
---Content that shall not appear in “Scope” or “Terms and Definitions” is adjusted
to “General Provisions”;
---“Subject Content and Scope of Application” is modified into “Scope”; “Normative
References”, “Terms” and “English Terms” are added;
---Textual modifications are made to some clauses.
Considering that in the practical implementation of GB/T 5617-1985 Determination of
Effective Depth of Hardening after Induction or Flame Hardening of Steel, many
enterprises adopt the verification method, which is not only simple and practical, but
also conductive to improving the accuracy of the determination of effective depth of
hardening. For this reason, relevant clauses of verification are added to this
amendment.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee on Heat
Treatment of Standardization.
The drafting organizations of this Standard: Shanghai Research Institute of Materials;
Shanghai Qiantong Automobile Accessories Co., Ltd.
The main drafters of this Standard: Gao Yushun, Dong Huiming.
The issuing of the previous version:
Determination of Effective Depth of Hardening after
Induction or Flame Hardening of Steel
1 Scope
This Standard specifies the meaning and determination method of effective depth of
hardening (DS) of steel parts after induction or flame hardening.
This Standard is applicable to parts whose effective depth of hardening is greater than
0.3 mm after induction or flame hardening.
2 Normative References
Through the reference in this Standard, the clauses of the following documents
become clauses of this Standard. In terms of references with a specified date, all the
subsequent modification sheets (excluding the corrected content) or revised versions
are not applicable to this Standard. However, the various parties that reach an
agreement in accordance with this Standard are encouraged to explore the possibility
of adopting the latest version of these documents. In terms of references without a
specified date, the latest version is applicable to this Standard.
GB/T 230.1-2004 Metallic Rockwell Hardness Test - Part 1: Test Method (scales A, B,
C, D, E, F, G, H, K, N, T) (ISO 6508-1:1999, MOD)
GB/T 4340.1-1999 Metallic Materials - Vickers Hardness Test - Part 1: Test Method
GB/T 7232-1999 Terminology of Metal Heat Treatment
GB/T 9450-2005 Steels - Determination and Verification of the Depth of Carburized
and Hardened Cases (ISO 2639:2002, MOD)
GB/T 18449.1-2001 Metallic Knoop Hardness Test - Part 1: Test Method
3 Terms and Definitions
The terms and definitions determined in GB/T 7232, and the following terms and
definitions are applicable to this Standard.
Limiting Hardness
Limiting hardness is generally 0.8 times of the minimum hardness (HV) required by the
surface of parts, as it is shown in the following formula: