GB/T 29459.1-2012 English PDF (GBT29459.1-2012)

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GB/T 29459.1-2012: Small punch test methods of metallic materials for in-service pressure equipment -- Part 1: General requirements
GB/T 29459.1-2012
GB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 77.040.10
H 22
Small punch test methods of metallic materials
for in-service pressure equipments –
Part 1. General requirements
ISSUED ON. DECEMBER 31, 2012
IMPLEMENTED ON. JULY 1, 2013
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3 
Introduction ... 4 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms, definitions and symbols ... 5 
4 Specimen ... 8 
5 Test device ... 9 
6 Test report ... 10 
Foreword
GB/T 29459 Small punch test methods of metallic materials for in-service
pressure equipments consists of the following two parts.
- Part 1. General requirements;
- Part 2. Method of test for tensile properties at room temperature.
This Part is the first part of GB/T 29459.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part mainly referred to relative technical content of CWA 15627 Small
punch test methods of metallic materials and was formulated based on the
combination of the actual situation of China and research results.
This Part was proposed by and shall be shall be under the jurisdiction of
National Technical Committee on Boiler and Pressure Vessel of Standardization
Administration of China (SAC/TC 262).
The drafting organizations of this Part. China Special Equipment Inspection and
Research Institute, East China University of Science and Technology, Nanjing
University of Technology, Nanjing University of Technology, Jiangsu Special
Equipment Safety Supervision and Inspection Institute.
Main drafters of this Part. Xu Tong, Sun Liang, Jia Guodong, Guan Kaishu,
Wang Zhiwen, Ling Xiang, Yuan Biao, Qian Gong, Zhang Xian, Li Liqun, Ding
Keqin.
Small punch test methods of metallic materials
for in-service pressure equipments –
Part 1. General requirements
1 Scope
This Part of GB/T 29459 specifies general requirements for small punch test
methods of metallic materials for in-service pressure equipment.
This Part is applicable to metallic materials for pressure equipment.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 16825.1-2008, Verification of static uniaxial testing machines - Part 1.
Tension/compression testing machines - Verification and calibration of the
force-measuring system
3 Terms, definitions and symbols
3.1 Terms and definitions
The following terms and definitions apply to this document.
3.1.1 small punch test; SPT
a test method for mechanical properties which takes micro-sheet sample as test
object; this method fixes the edge of the sheet specimen; the center of the
specimen is loaded with a spherical punch at the top of the punch in a
mechanically loading manner; the mechanical properties of the composites are
determined by experimental data association. The schematic diagram of the
test device is shown in Figure 1.
3.1.2 load; F
the mechanical force exerted by the plunger on the specimen
3.1.9 sample
a sheet of material removed from the equipment
3.1.10 specimen
the sheet material which meets small punch test requirements
3.2 Symbols
d1 - specimen diameter, in millimeters (mm);
d2 - lower fixture aperture, in millimeters (mm);
E - elastic modulus, in megapascals (MPa);
F - load, in newtons (N);
h - specimen thickness, in millimeters (mm);
r - radius of the punch or ball, in millimeters (mm);
T - test temperature, in Celsius degrees (°C);
t - test time, in seconds (s);
u - punch displacement, in millimeters (mm);
V - test speed (movement speed of punch under pressure), in millimeters per
second (mm/s).
4 Specimen
4.1 Sampling
4.1.1 General requirements
Sampling should prevent overheating and work hardening which shall affect the
mechanical properties of the specimen. The specimen shall not contain any
cracks and other macroscopic defects. And it should ensure that the cut pieces
have integrity.
4.1.2 Sampling position
The cutting of test piece should avoid the corrosion layer (as shown in Figure
3).