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GB/T 2523-2022 PDF in English


GB/T 2523-2022 (GB/T2523-2022, GBT 2523-2022, GBT2523-2022)
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GB/T 2523-2022: PDF in English (GBT 2523-2022)

GB/T 2523-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.040.99
CCS H 21
Replacing GB/T 2523-2008
Measuring method of surface roughness, peak count and
waviness for cold-rolled metal sheet and strip
ISSUED ON: JULY 11, 2022
IMPLEMENTED ON: FEBRUARY 01, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Symbols and descriptions ... 9 
5 Principle ... 10 
6 Specimens ... 10 
7 Measurement requirements ... 10 
8 Measurement procedure ... 13 
9 Rounding of measurement values ... 15 
10 Test report ... 15 
Annex A (normative) Marciniak cup specimen processing ... 16 
Annex B (informative) Example of applying standard blocks to verify measurement
results ... 18 
Annex C (informative) Measurement of filtered centre line waviness (WCA) ... 19 
Bibliography ... 20 
Measuring method of surface roughness, peak count and
waviness for cold-rolled metal sheet and strip
1 Scope
This document specifies the principle, specimens, measurement requirements,
measurement procedures, rounding of measurement values and test reports for surface
roughness, peak count and waviness for cold-rolled metal sheet and strip.
This document is applicable to the measurement of surface roughness, peak count and
waviness for cold-rolled metal sheet and strip. It is also applicable to the cold-rolled
metal sheet and strip with surface metal coating.
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 3505-2009, Geometrical product specifications (GPS) - Surface texture:
Profile method - Terms, definitions and surface texture parameters
GB/T 6062-2009, Geometrical product specifications (GPS) - Surface texture:
Profile method - Nominal characteristic of contact (stylus) instruments
GB/T 8170, Rules of rounding off for numerical values and expression and
judgement of limiting values
JJF 1105, Calibration Specification for Contact (Stylus) Instruments of Surface
Roughness Measurement by Profile Method
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 3505-
2009 as well as the followings apply.
3.1 roughness average; Ra
The arithmetic mean of the absolute value of the ordinate value Z(x) of the roughness
profile within a sampling length, see Figure 1.
to suppress short-wave components.
3.8 arithmetical mean deviation of waviness profile; Wa
Arithmetic mean of absolute values of the ordinate values of the waviness profile Z(x)
within a sampling length. It is calculated according to formula (1).
3.9 arithmetical mean of waviness profile; Wa0.8, Wsa1-5
Arithmetic mean of the absolute values of the ordinate values of the waviness profile
Z(x) within an evaluation length. It is calculated according to formula (2).
When Wa0.8 is selected, λs=8μm, λc=0.8mm. When Wsa1-5 is selected, λs=8μm,
λc=1mm and λf=5mm.
3.10 filtered waviness curve
The curve obtained after suppressing the short-wave portion with λc in the original
profile.
3.11 centre line
A reference line with a geometric profile that aligns with the profile within the sampling
length. The profile is divided by this line within the sampling length so that the areas of
the upper and lower sides are equal.
[Source: GB/T 3505-1983, definition 1.21]
3.12 filtered centre line waviness curve
The curve obtained by suppressing the long-wave portion using λf from the filtered
waviness curve.
3.13 filtered centre line waviness; WCA
Acquire a portion of length l along the filtered centre line waviness curve. The filtered
centre line waviness curve is represented by Z=f(x). Take the centerline of the sampled
section as the X axis. Its vertical magnification direction is used as the Z axis. Use
formula (3) to define the filtered centre line waviness WCA, in microns (μm):
5 Principle
Place a diamond stylus with a certain angle and tip radius vertically on the surface of
the specimen with the specified contact force. Move in a straight line at a specified rate.
The stylus moves vertically with the profile of the specimen surface. The tiny
displacements generated by this movement are converted into electrical signals by the
circuit and processed, and then Ra, Rz, Rz1 max, RPc (PPI), Wa, Wa0.8 and Wsa1-5 can
be obtained.
6 Specimens
6.1 The sampling location shall be in accordance with the relevant product standards or
agreements. When not specified, it is taken at a position that can represent the roughness
and waviness of the entire metal sheet and strip. Generally, it is located at half the width
of the strip.
6.2 For Ra, Rz, Rz1 max, RPc (or PPI), Wa and specimens that do not need to be
punched into Marciniak cups to measure Wa0.8 and Wsa1-5, it is recommended to use a
square (or circle) with a side length (or diameter) of 100mm.
6.3 When punching into Marciniak cups to measure Wa0.8 and Wsa1-5, the side length
of the sample blank shall be at least 220mm×220mm. The plastic elongation (Apx and
Apy) and the number of specimens in the two directions of the bottom of the Marciniak
cup shall be specified in the relevant product standard or agreement. The processing
method of Marciniak cup specimens shall comply with the provisions of Annex A.
6.4 Sample blanks and specimens shall be flat, free from scratches. The surface of the
specimen shall be free from rust spots, stains and other surface defects.
6.5 Scrub the measurement area of the specimen with acetone or alcohol before
measurement. Immediately measure.
7 Measurement requirements
7.1 Instruments
9 Rounding of measurement values
The value of the measurement result shall be rounded up in accordance with the
provisions of the relevant product standard or agreement. If not specified, the rounding
shall be carried out according to the following requirements. The method of rounding
is in accordance with GB/T 8170.
- Ra, Rz, Rz1 max, Wa, Wa0.8 and Wsa1-5 are rounded to 0.01μm;
- RPc (PPI) is rounded to 1.
10 Test report
If applicable, the test report shall include at least the following:
a) Reference to this document;
b) Specimen number;
c) Name and designation of material;
d) Stylus angle and tip radius;
e) Measuring direction;
f) Measurement selected λs, λc and λf lengths (when used);
g) Measurement results of Ra, Rz, Rz1 max, Wa, Wa0.8 and Wsa1-5 (when
measurement is required) and plastic elongation of Wa0.8 and Wsa1-5 (when using
Marciniak cup specimens);
h) Measurement result of RPc (or PPI) and the peak count level used (when
measurement is required);
i) All measurement conditions that differ from those specified in this document.
Annex C
(informative)
Measurement of filtered centre line waviness (WCA)
C.1 Overview
This appendix gives definitions and measurement parameters related to filtered centre
line waviness (WCA).
NOTE: Some cold-rolled automotive sheet users require this indicator to be measured.
C.2 Test parameter settings
Use the following parameter settings to measure the filtered centre line waviness:
a) Adopt 2RC75 filter;
b) The wavelength λc used to suppress the short-wave part is generally 0.8mm;
c) The wavelength λf used to suppress the long-wave part is generally 8mm;
d) The measurement length used to test WCA is generally 25mm.
C.3 Measurement
The specimen is generally a square (or circle) with a side length (or diameter) of 100mm.
When measuring, a stylus with a nominal tip angle of 90° and a radius (rtip) of 5μm shall
be used. Place the specimen flat on the measuring table. The direction of stylus travel
is in accordance with the relevant product standards or agreements. When not specified,
the stylus travel direction is perpendicular to the rolling direction. The measurement
surface of each specimen is measured at least three times. Take the arithmetic mean as
the measurement result.
C.4 Rounding of measurement values
The measurement result WCA is rounded to 0.01μm. The rounding method is in
accordance with GB/T 8170.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.