GB/T 1814-1979
Active
GB/T 5028-2025
Active
National standards
GB/T 5028-2025 Metallic materials—Sheet and strip—Determination of tensile strain hardening exponent(n)
GB/T 5028-2025 Metallic materials—Sheet and strip—Determination of tensile strain hardening exponent(n)
Basic Information
Standard Code:
GB/T 5028-2025
Standard Type:
National standards
Standard Status:
Active
is_force_gb:
no
CCS Name:
\nTest methods for the performance of metal products
ICS Name:
Mechanical testing of metal materials
Publish Date:
2025-06-30
Implement Date:
2026-01-01
Pages:
16 pages
Scope
This document specifies the principles, test equipment, samples, test procedures, and test reports for determining the tensile strain hardening index (n value) of metal sheets and strips.
This method is only applicable to the portion of the stress-strain curve that shows a monotonically increasing trend within the range of plastic deformation (see 8.4).
If the stress-strain curve of the material exhibits a sawtooth pattern during the work hardening stage (such as the Portevin-Le Chatelier sawtooth yielding effect observed in some AlMg alloys), in order to ensure the reproducibility of the results, an automatic measurement method is used (linear regression of the logarithm of the true stress and the true plastic strain, see 8.7).
Development Information
Replace the following standards
Referenced Standards
GB/T 228.1-2010 Metallic materials—Tensile testing—Part 1:Method of test at room temperature
GB/T 228.1-2021 Metallic materials—Tensile testing—Part 1:Method of test at room temperature
GB/T 5027-1999 Metallic materials—Sheet and strip—Determination of plastic strain ratio(r-values)
GB/T 5027-2007 Metallic materials—Sheet and strip—Determination of plastic strain ratio
GB/T 5027-2016 Metallic materials—Sheet and strip—Determination of plastic strain ratio
GB/T 5027-2025 Metallic materials—Sheet and strip—Determination of plastic strain ratio(r)
GB/T 8170-1987 Rules for rounding off of numberical values
GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgement of limiting values
GB/T 12160-2002 Calibration of extensometers used in uniaxial testing
GB/T 12160-2019 Metallic materials—Calibration of extensometers systems used in uniaxial testing
GB/T 16825.1-2002 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 Verification of static uniaxial testing machines—Part 1:Tension/compression testing machines—Verification and calibration of the force-measuring system
GB/T 16825.1-2022 Metallic materials—Calibration and verification of static uniaxial testing machines—Part 1:Tension/compression testing machines—Calibration and verification of the force-measuring system
Adopt standards
ISO 10275:2020
Related Standards
GB/T 2107-1980
Replaced
GB/T 2107-1980 Metal material—Twisting fatigue test
GB/T 3075-1982
Replaced
GB/T 3075-1982 Method of axial force controlled fatigue testing of metals
GB/T 3373-1982
Replaced
GB/T 3373-1982 Rims for tractors, agricultural and forestry machines
GB/T 3771-1983
Active
GB/T 3771-1983 Conversion of hardness and strength for copper alloys
GB/T 4105-1983
abolished_transferred