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JB/T 9204-2008 English PDF (JBT9204-2008)

JB/T 9204-2008 English PDF (JBT9204-2008)

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JB/T 9204-2008: Metallographic examination of induction hardened steel parts

This Standard specifies the technical requirements and corresponding inspection methods for metallographic examination of induction hardened steel parts. This Standard is applicable to the examination of mechanical parts made of medium carbon structural steel and medium carbon alloy steel with metallographic structure and effective hardened layer depth after high and medium induction hardening.
JB/T 9204-2008
JB
MACHINERY INDUSTRY STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 25.200
J 36
Record No.. 24503-2008
Replacing JB/T 9204-1999
Metallographic examination of
induction hardened steel parts
ISSUED ON. JUNE 4, 2008
IMPLEMENTED ON. NOVEMBER 1, 2008
Issued by. National Development and Reform Commission, People's
Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Technical requirements ... 4
4 Sample preparation ... 5
5 Inspection methods ... 5
Foreword
This Standard replaces JB/T 9204-1999 Metallographic examination of
induction hardened steel parts.
Compared with JB/T 9204-1999, the main changes in this Standard are as
follows.
- specified and labelled various information on the cover;
- adjusted and populated the relevant elements in the Foreword;
- improved the introduction of "Normative references" and gave the
identification of the project;
- the previous edition divided the "microscopic organization classification map" into 1~10 levels which were represented respectively with 10 figure numbers from "Figure 1 ~ Figure 10"; this Standard divided the
"microscopic organization classification map" as Figure 1 and the figure numbers are "a) ~ j)" (see 3.3, Table 1, Figure 1).
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 Administration of China (SAC/TC 75). Main drafting organizations of this Standard. Beijing Mechanical and Electrical Research Institute, First Automobile Group Corporation.
Main drafters of this Standard. Wu Bingshu, Liu Kejun, Xu Xiangqiu.
Versions of standard substituted by this Standard are.
- ZB J36009-1988;
- JB/T 9204-1999.
Metallographic examination of
induction hardened steel parts
1 Scope
This Standard specifies the technical requirements and corresponding
inspection methods for metallographic examination of induction hardened steel parts.
This Standard is applicable to the examination of mechanical parts made of medium carbon structural steel and medium carbon alloy steel with
metallographic structure and effective hardened layer depth after high and medium induction hardening.
2 Normative references
The following standards contain the provisions which, through reference in this Standard, constitute the provisions of this Standard. For dated references, subsequent amendments (excluding corrections) or revisions do not apply to this Standard. However, the parties who enter into agreement based on this Standard are encouraged to investigate whether the latest versions of these documents are applicable. For undated reference documents, the latest
versions apply to this Standard.
GB/T 5617, Determination of effective depth of hardening after induction or flame hardening of steel (GB/T 5617-2005, ISO 3754.1976, NEQ)
3 Technical requirements
3.1 The surface hardness of the part and the effective hardened layer depth shall comply with the provisions of the product drawings.
3.2 After the parts are quenched, there shall be no defects such as cracks or burns on the surface.
3.3 After quenching and low temperature tempering (???200??C), the
metallographic structure is evaluated according to Figures 1a) ~ j). See Table 1 for rating description.
When the drawing specifies that the lower limit of hardness is higher than or

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