GB/T 29459.2-2012Small punch test methods of metallic materials for in-service pressure equipment - Part 2: Method of test for tensile properties at room temperature (English PDF)

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 second 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, Fujian Boiler and

Pressure Vessel Inspection and Research Institute.

Main drafters of this Part. Guan Kaishu, Xu Tong, Yuan Biao, Ling Xiang, Wang

Zhiwen, Jia Guodong, Sun Liang, Gong Lingzhu.

Small punch test methods of metallic materials for in-

service pressure equipments - Part 2. Method of test

for tensile properties at room temperature

1 Scope

This Part of GB/T 29459 specifies the explanation on symbols, test

requirements, test records, test data processing and test reports of small punch

test method which obtains tensile properties of material at room temperature.

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 228.1, Metallic materials - Tensile testing - Part 1 . Method of test at

room temperature

GB/T 29459.1, Small punch test methods of metallic materials for in-service

pressure equipments - Part 1. General requirements

3 Symbols

Symbols specified in GB/T 29459.1 and the following ones apply to this

document.

A - elongation at break after conventional tensile test, %;

E - elastic modulus, in megapascals (MPa);

F(u) - load-displacement function obtained in test, in newtons (N);

F(u) - load-displacement function fitted by curve obtained in test, in newtons

(N);

Fp - yield load of small punch test, in newtons (N);

hf - minimum thickness of fracture, in millimeters (mm);

ReL - conventional tensile test yield strength, in megapascals (MPa);

RP - non-proportional elongation strength of conventional tensile test, in

megapascals (MPa);

Rm - tensile strength of conventional tensile test, in megapascals (MPa);

umax - punch displacement at the maximum load of small test punch, in

millimeters (mm);

Z - reduction rate of cross section of conventional tensile test, %;

ZSP - reduction rate of cross section of small punch test, %.

4 Test requirements