JB/T 10174-2008 English PDF (JB/T10174-2008)

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JB/T 10174-2008: Methods of quality inspection on shot-peening for steel-iron parts
JB/T 10174-2008
JB
MACHINERY INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 25.200
J 36
Record No.. 24509-2008
Replacing JB/T 10174-2000
Methods of quality inspection on
shot-peening for steel-iron 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 Terms and definitions .. 4 
4 Projectile material for shot-peening . 5 
4.1 Projectile types .. 5 
4.2 Technical requirements of projectile .. 6 
5 Testing devices .. 7 
5.1 Almen .. 7 
5.2 Almen fixture .. 8 
5.3 Arc height gauge .. 8 
6 Measurements of shot strength and convert rate .. 9 
6.1 Labeling and measurement of shot strength .. 9 
6.2 Measurement of convert rate .. 10 
7 Quality control of part shot-peening . 10 
Annex A (normative) Relationship between almens .. 11 
Table 1 -- Specifications of cast steel projectile for strengthening . 6 
Table 2 -- Size parameters and technical requirements for standard almen .. 7 
Table 3 -- Application range of each almen .. 7 
Figure 1 -- Almen fixture (tool steel, hardened state) .. 8 
Figure 2 -- Arc height gauge (scale value is 0.025mm) .. 9 
Figure A.1 -- Relationship between Almens A, N, C .. 11 
Foreword
This Standard replaces JB/T 10174-2000 "Methods of quality inspection on
shot-peening for steel-iron parts".
Compared with JB/T 10174-2000, the main changes in this Standard are as
follows.
- regulated and labeled various information on the cover;
- adjusted and filled in related elements in the "Foreword";
- standardized the guide of "Normative reference", added normative
reference, and marked the adopted project;
- standardized the terms and definitions;
- standardized the "NOTEs" in table (see Table 1);
- standardized the "unit" in table (see Table 2);
- modified "Annex A (standard)" in the previous edition to "Annex A
(normative)" (see 5.1 and Annex A).
Annex A of this Standard is normative.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee
on Thermal Treatment of Standardization Administration of China (SAC/TC 75).
Main drafting organizations of this Standard. China FAW Group Jiaxin Heat
Treatment Electroplating Co., Ltd., Changchun Institute of Automotive Materials,
China Yi Hang Beijing Aviation Material Research Institute.
Main drafters of this Standard. Zhao Xiaoyi, Wang Zhengli, Yang Tao, Xu Zhaoyi,
Mou Zongshan, Liang Zhikai.
Version of standard substituted by this Standard is.
- JB/T 10174-2000.
Methods of quality inspection on
shot-peening for steel-iron parts
1 Scope
This Standard specifies the determination methods for the types, technical
requirements, testing devices, shot strength and covert rate of projectile used
for shot-peening.
This Standard is applicable to the inspection on shot-peening for steel-iron parts.
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 230.1, Metallic materials - Rockwell hardness test - Part 1. Test method
(scales A, B, C, D, E, F, G, H, K, N, T) [GB/T 230.1-2004, ISO 6508-1.1999
Metallic materials-Rockwell hardness test-Part 1.Test method (scales A, B,
C, D, E, F, G, H, K, N,T), MOD]
GB/T 1298, Carbon tool steels (GB/T 1298-1986, neq ASTM A686.1979)
GB/T 6003.1, Test sieves of metal wire cloth (GB/T 6003.1-1997, eqv ISO
3310-1.1990)
YB/T 5058, Cold-rolled spring and tool steel strips
YB/T 5149, Cast steel shot
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 shot-peening
high-speed shot peening is sprayed on the surface of the steel part to cause
plastic deformation of the surface layer under the impact of the projectile; this
results in strengthening and surface compressive stress, which improves the
fatigue resistance and stress corrosion resistance of the steel parts
3.2 almen
the almen is a special gauge that comprehensively measures the process
parameters of shot peening; it is made of spring steel (shall comply with YB/T
5058); it has three sizes, the models are. N, A, C
3.3 arc high value
the standard Almen test piece is fixed on the fixture and is subjected to single-
surface shot-peening; the almen is plastically deformed under the impact of the
projectile, causing the almen spherically curved toward the peening surface;
then the bending arc height of almen is measured with arc height gauge
3.4 shot time
the time required for the peened part to reach 100% covert rate from the start
of shot-peening during the shot-peening of the peened part
3.5 shot strength
an indicator of the extent to which a projectile strikes a metal surface, which is
a function of many process parameters (such as part material, projectile size,
projectile performance, peening speed, peening time, etc.); the shot strength is
represented by the arc height increase generated when the covert rate
corresponding to the arc height increase produced by the almen (Almen test
piece) less than or equal to 10% at a double peening time is at least 100%
3.6 covert rate
the degree of pressure pits on the surface of peened part; it is the ratio of the
area occupied by the shot mark measured on the surface to be peened to the
area required for shot-peening, expressed in percentage; the surface covert
rate exceeding 100% is calculated in shot time
4 Projectile material for shot-peening
4.1 Projectile types
The cast steel projectile shall comply with the provisions of YB/T 5149. The
cutting wire projectile of which the sharp corner is ground off by initial peening
can also be used.
6.2 Measurement of convert rate
The convert rate of part surface can be checked with a 10x magnifying glass.
When there is doubt about the covert rate in the known shot-peening cycle, a
test piece (102mm x 102mm) of the same material and hardness as the part
shall be polished and peened under the same conditions as the part. Then,
place the almen under the metallurgical microscope to check the peened
surface. Project the image 50x onto a frosted glass. Use an area meter to
measure the total area of all peened areas at several observation sites. Take
its mean value.
7 Quality control of part shot-peening
7.1 According to the working conditions and performance requirements of
steel parts, the shot strength value is determined according to the technical
requirements of the product drawings, generally be 0.35A or more.
7.2 The convert rate shall meet the technical requirements of the product
drawings, generally not be less than 200%.
7.3 Appropriate shot strength shall be used for different part. For super thin or
small-section parts, high shot strength must not be used so as to prevent the
residual stress caused in the center of the part which shall result in deformation.
7.4 When there are special ...