GB/T 228.2-2015Metallic materials -- Tensile testing -- Part 2: Method of test at elevated temperature (English PDF)

Foreword

GB/T 228 Metallic Materials – Tensile Testing can be divided into the following four

parts.

--- Part 1. Method of Test at Room Temperature;

--- Part 2. Method of Test at Elevated Temperature;

--- Part 3. Method of Test at Low Temperature;

--- Part 4. Method of Test in Liquid Helium.

This Part belongs to Part 2 of GB/T 228.

This Part was drafted as per the rules specified in GB/T 1.1-2009.

This Part replaced GB/T 4338-2006 Metallic Materials – Tensile Testing at Elevated

Temperature; compared with GB/T 4338-2006, this Part has the major technical

changes as follows.

--- Modify the standard name;

--- Modify and increase partial terms and symbols, for instance, the indicated

temperature symbol is changed from "theta" to "T"; the prescribed temperature

symbol is changed from "thetai" to "Ti"; increase term "holding time ts"; change

"prescribed non-proportional extension strength Rp" into "prescribed plastic

elongation strength Rp";

--- Add test rate control method A strain rate control method;

--- Increase "1000°C< T<=1100°C" allowable deviation of temperature and

temperature gradient to the Table 2 Allowable Deviation of Temperature and

Temperature Gradient in Chapter 9;

--- Add extensometer and chucking method to Chapter 10;

--- Modify the rounding off the test result values.

This Part adopts the re-drafting method to modify and use international standard ISO

6892-2.2011 Metallic Materials – Tensile Testing – Part 2. Method of Test at Elevated

Temperature.

This Part is basically consistent with ISO 6892-2.2011 in the aspects of overall

structure, layer division, preparation method and technical content.

This Part made the modification and supplement against the international standard in

Metallic Materials – Tensile Testing –

Part 2. Method of Test at Elevated Temperature

1 Scope

This Part specifies the definitions, symbols instructions, specimen and its dimension

measurement, test equipment, test requirements, property determination,

determination result values rounding off and test report for the method of tensile testing

of metallic materials at the temperature higher than the room temperature.

This Part is applicable to the test of tensile property of metallic materials at the

temperature higher than the room temperature.

2 Normative References

The following documents are essential to the application of this document. For the

dated documents, only the versions with the dates indicated are applicable to this

document; for the undated documents, only the latest version (including all the

amendments) are applicable to this document.

GB/T 228.1-2010 Metallic Materials - Tensile Testing - Part 1. Method of Test at

Room Temperature (ISO 6892-1.2009, MOD)

GB/T 16825.1 Verification of Static Uniaxial Testing Machines - Part 1.

Tension/Compression Testing Machines - Verification and Calibration of the Force-

Measuring System (GB/T 16825.1-2008, ISO 7500-1.2004, IDT)

GB/T 12160 Calibration of Extensometers Used in Uniaxial Testing (GB/T 12160-

2002, ISO 9513.1999, IDT)

3 Terms and Definitions

The following terms and definitions stipulated in GB/T 228.1-2010 are applicable to this

document.

Generally, all specimens' geometric dimensions shall be measured at the room

temperature; the extensometer gauge length (see 3.3 and 10.2.2) may be exceptional.

NOTE. Unless otherwise specified in the relevant specifications and agreements, generally, the

elevated temperature performance shall not be measured.

--- Specified residual extension strength (Rr);

--- Residual elongation rate;

--- Residual extension rate;

--- Percentage yield point extension (Ae);

--- Percentage total extension at maximum force (Agt);

--- Percentage plastic extension at maximum force (Ag);

--- Total extension at fracture (At).