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GB/T 8361-2001 (GB/T8361-2001)

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GB/T 8361-2001: PDF in English (GBT 8361-2001)
GB/T 8361-2001
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Replacing GB/T 8361-1987
The surface of cold drawn rounds steel –
Method for the ultrasonic inspection
ISSUED ON. DECEMBER 17, 2001
IMPLEMENTED ON. MAY 1, 2002
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Quoted standards ... 4 
3 Inspection principle ... 4 
4 Test methods ... 4 
5 Sample comparison ... 5 
6 Inspection equipment ... 5 
7 Inspection conditions ... 6 
8 Inspection procedures ... 7 
9 Detection result assessment ... 7 
10 Detection record and inspection report ... 7 
Foreword
This standard is revised based on GB/T 8361-1987 "The ultrasonic inspection
method for the surface of bearing steel (cold drawn rounds)".
The following contents are revised.
— Standard name is changed to "The surface of cold drawn rounds steel -
Method for the ultrasonic inspection” which expanded scope of
application;
— Diameter scope of application of cold drawn round steel is increased
from 6 mm~50 mm to 6 mm~80 mm;
— Inspection principle description is added;
— One detection direction is added to test method, namely, from radial
direction of round steel to two reverse directions on circles of round
steel; so no part will be undetected due to directionality of flaw;
— artificial defect levels are changed from third levels to six levels;
diametric percentage representation of artificial depth of flaw is turned
into numerical representation;
— Requirements for inspection equipment are increased.
This standard replaces GB/T 8361-1987 "The ultrasonic inspection method for
the surface of bearing steel (cold drawn rounds)" since the day of
implementation.
This standard was proposed by former National Metallurgical Industry Bureau.
This standard shall be under the jurisdiction of China Steel Standardization
Technical Committee
Drafting organization of this standard. Shanghai Wugang Co., Ltd. of Baosteel
Group.
Chief draft staffs of this standard. Jiang Yimin, Wang Yongling, Zhu Qiyun and
Ni Xiumei.
This standard was first-time issued in November 1987.
The surface of cold drawn rounds steel –
Method for the ultrasonic inspection
1 Scope
This standard specifies principle of cold drawn round steel surface ultrasonic
inspection, test method, control sample, inspection equipment, and inspection
condition; inspect procedure, result of detection assessment and report.
This standard is applicable to surface inspection of cold drawn round steel with
diameter of 6 mm ~ 80 mm. This method is applicable to detect flaws like
longitudinal cracks and folds on the surface of cold drawn round steel.
2 Quoted standards
The provisions in the quoted standards become part of this standard by citation.
When this standard is published, all editions are effective. All standards are
subject to revision; parties who reach an agreement based on this standard
are encouraged to investigate the possibility of applying the most recent
editions of the standards indicated below.
JB/T 10061 Commonly used specification for A-mode ultrasonic flaw detector
using pulse echo technique
JB/T 10062-1999 Testing methods for performance of probes used in
ultrasonic flaw detection
3 Inspection principle
Longitudinal wave is directional radiated from ultrasonic probe and be
transferred onto round steel surface by passing couplant and in the specific
angle of incidence. Wave mode will change and surface wave or transverse
wave will be formed. Surface wave or transverse wave travelled on the surface
of steel and in the still will be reflected when flaw is encountered. Ultrasonic
probe will receive the wave. Flaw information can be got when it is processed
by instrument.
4 Test methods
6.1.2 Flaw detector shall be with adequate repetition frequency regulating
range so as to adapt to variation of speed in inspection.
6.1.3 Other performances of flaw detector shall be able to meet the
requirements of automatic inspection and be with adequate working site
disturbance-resistance capability.
6.2 Probe
6.2.1 Single probe or multi-probe can be used. Line focusing type acoustic
lens can be added to the probe. Crystal plate length or diameter of single
probe shall be no greater than 20 mm.
6.2.2 Working frequency of probe can be made between 2.5 MHz ~ 10 MHz.
6.2.3 Probe performance shall conform to requirements of JB/T 10062.
6.3 probe control device
6.3.1 Within certain field, this device shall be with good traceability, namely,
with certain inspection, angle of incidence degree and verticality corresponding
to round steel remains stable.
6.3.2 There shall be firm and flexible probe clampers to be used for adjustment
of probe.
6.4 mechanical drive
This device shall guarantee that round steel can be sent to probe control
device steadily and round steel and probe can be stable.
7 Inspection conditions
7.1 Flatness, non-circularity and end quality of round steel shall meet
correspondent product standards. Round steel surface shall be clean and be
free from scrap iron and contaminations.
7.2 Couplant can be clean water or oil that is free from bubbles and be with
acoustic coupling performance. Antirust measures shall be taken to water
logging inspection.
7.3 Inspection staff shall be with ultrasonic inspection staff qualification
certificate 1 level or above issued by non-destructive testing qualification
department. Anyone who signs the report shall be with ultrasonic inspection
staff qualification certificate of level II or above.
......
 
(Above excerpt was released on 2016-04-30, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT8361-2001