GB/T 4338-2006Metallic materials—Tensile testing at elevated temperature
1 Scope
This national standard specifies terminology, definition, symbol, name, experimentation principle, test equipment, sample, test method, result treatment and test report of metallic material tensile test method at 35℃.
This standard is applicable to metallic material tensile test at 35℃.
2 Normative References
The following normative documents contain provision which, through reference in this text, constitute provisions of this national standard. For all the citation files that bear the dates, all the subsequent amendment documents(not including the corrected contents)or the revised edition are not applicable to this standard, yet, all parties that enter into an agreement according to this standard are encouraged to research whether the latest edition of these documents can be used. For undated references, the latest edition of the normative document referred to applies.
GB/T 228 Metallic Materials - Tensile Testing at Ambient Temperature (GB/T 228—2002, eqv ISO 6892:1998)
GB/T 2975 Steel and steel products--Location and preparation of test pieces for mechanical testing (GB/T 2975—1998, eqv ISO 377:1997)
GB/T 8170 Rules for Rounding-off of Numerical Values
GB/T 12160 Calibration of extensometers used in uniaxial testing ( GB/T 12160—2002, ISO 9513:1999,IDT)
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—2002, ISO 7500 - 1: 1999, IDT)
GB/T 17600.1 Steel--Conversion of elongation values--Part 1: Carbon and low alloy steels (GB/T 17600.1—1998, eqv ISO 2566 - 1:1984)
GB/T 17600.2 Steel--Conversion of elongation values--Part 2: Austenitic steels (GB/T 17600.2—1998, eqv ISO 2566 - 2:1984)
JJG 141 Working Noble Metal Thermocouples
JJG 351 Verification Regulation of Working Base Metal Thermocouple
3 Terminologies and Definition
This standard adopts the following terminologies and definitions.
3.1
gauge length
Length of parallel part to measure elongation of sample at any moment of the test.
Note: paid attention to distinguish gauge length in 3.1.1 and 3.1.2.
3.1.1
original gauge length
L0
Sample gauge length at room temperature prior to application of force
3.1.2
final gauge length
L※
Sample gauge length at room temperature after fracture of sample
3.2
parallel length
Lc
Length between parallel parts of both ends and two griped parts of sample (without head sample).
3.3
Extensometer gauge length
Le
Length of parallel part when extensometer is used to measure extension of the sample.
Extensometer gauge length can be different from L0; but it shall be more than b, d or D (see Table 1) and less than Lc.
3.4
extension
Extensometer gauge length (Lc increment) at any setting moment of test period.
3.5
elongation
Increment of original gauge length ( L0) at any moment of test period.
3.6
Percentage elongation
Percentage between original gauge length elongation and original gauge length ( L0).
3.6.1
Percentage permanent extension
When stipulated stress is applied or canceled from the sample, percentage between extensometer gauge length extension and extensometer gauge length ( Le).
3.6.2
percentage elongation after fracture
A
Percentage between permanent elongation (Lu- L0) of final gauge length and original gauge length (L0) ( see figure 1).
3.6.3
Percentage total elongation at fracture
At
Contents Foreword 1 Scope 2 The normative references 3 Terminologies and Definition 4 Symbol and name 5 Experimentation principles 6 Test equipment 7 Samples 8 Test methods 9 Result treatments 10 Test report Annex A Annex B Annex C Annex D Annex E Annex F Annex H Annex I Annex J Annex K
