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GB/T 24180-2020 English PDF (GBT24180-2020)

GB/T 24180-2020 English PDF (GBT24180-2020)

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GB/T 24180-2020: Cold-reduced electrolytic chromium/chromium oxide coated steel sheet and strip
GB/T 24180-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Replacing GB/T 24180-2009
Cold-reduced Electrolytic Chromium / Chromium
Oxide Coated Steel Sheet and Strip
ISSUED ON: JUNE 2, 2020
IMPLEMENTED ON: DECEMBER 1, 2020
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 ... 7 
4 Classification and Codes, Designations and Labels ... 7 
5 Order Content ... 8 
6 Dimensions, Shapes and Weights ... 8 
7 Technical Requirements ... 16 
8 Test Methods ... 21 
9 Inspection Rules ... 23 
10 Packaging, Marking and Quality Certificate ... 23 
11 A Comparison of Similar Quenching and Tempering Degree Codes between
this Standard and Relevant International Standards ... 24 
Appendix A (normative) Rebound Test Method for Secondary Cold-reduced
Sheet ... 25 
Appendix B (normative) Test Method for the Amount of Metal Chromium
Coating on the Surface of Chromium Coated Sheet ... 27 
Appendix C (normative) Test Method for the Amount of Chromium Oxide
Coating on the Surface of Chromium Coated Sheet ... 35 
Appendix D (normative) Conversion Table of HR15TSm and HR30TSm ... 42 
Appendix E (informative) A Comparison of Quenching and Tempering Degree
Codes (or steel grade codes) between This Standard and Relevant
International Standards ... 43 
Bibliography ... 44 
Cold-reduced Electrolytic Chromium / Chromium
Oxide Coated Steel Sheet and Strip
1 Scope
This Standard specifies the classification and codes, designations and labels,
dimensions, shapes, weights, technical requirements, test methods, inspection rules,
packaging, marking and quality certificate of cold-reduced electrolytic chromium /
chromium oxide coated steel sheet and strip.
This Standard is applicable to primary cold-reduced electrolytic chromium / chromium
oxide coated steel sheet and strip with a nominal thickness of 0.14 mm ~ 0.80 mm, as
well as secondary cold-reduced electrolytic chromium / chromium oxide coated steel
sheet and strip with a nominal thickness of 0.12 mm ~ 0.36 mm (hereinafter referred
to as steel sheet and strip).
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
GB/T 223.5 Steel and Iron - Determination of Acid-soluble Silicon and Total Silicon
Content - Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.9 Iron Steel and Alloy - Determination of Aluminum Content - Chrome Azurol
S Photometric Method
GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual
Titration or Potentiometric Titration Method
GB/T 223.18 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium
Thiosulfate Separation Iodimetric Method for the Determination of Copper Content
GB/T 223.23 Iron, Steel and Alloy - Determination of Nickel Content - The
Dimethylglyoxime Spectrophotometric Method
GB/T 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content - The
Thiocyanate Spectrophotometric Method
GB/T 223.29 Iron, Steel and Alloy - Determination of Lead Content - Carrier
Precipitation-xylenol Orange Spectrophotometric Method
GB/T 223.31 Iron, Steel and Alloy - Determination of Arsenic Content - Distillation-
molybdenum Blue Spectrophotometric Method
GB/T 223.59 Iron, Steel and Alloy - Determination of Phosphorus Content - Bismuth
Phosphomolybdate Blue Spectrophotometric Method and Antimony
Phosphomolybdate Blue Spectrophotometric Method
GB/T 223.64 Iron, Steel and Alloy - Determination of Manganese Content - Flame
Atomic Absorption Spectrometric Method
GB/T 228.1-2010 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room
Temperature
GB/T 230.1 Metallic Materials - Rockwell Hardness Test - Part 1: Test Method
GB/T 247 General Rule of Package Mark and Certification for Steel Plates (sheets)
and Strips
GB/T 708 Dimension, Shape, Weight and Tolerance for Cold-rolled Steel Plate
GB/T 2520 Cold-reduced Electrolytic Tinplate
GB/T 2523 Measuring Method of Surface Roughness and Peak Count for Cold-rolled
Metal Sheet (strip)
GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission Spectrometric
Analysis of Carbon and Low-alloy Steel (routine method)
GB/T 6730.79 Iron Ores - Determination of Cadmium Content - Hydride Generation -
Atomic Fluorescence Spectrometric Method
GB/T 8170 Rules of Rounding off for Numerical Values and Expression and Judgement
of Limiting Values
GB/T 16597 Analytical Methods of Metallurgical Products - General Rule for X-ray
Fluorescence Spectrometric Methods
GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements
GB/T 20066 Steel and Iron - Sampling and Preparation of Samples for the
Determination of Chemical Composition
GB/T 20123 Steel and Iron - Determination of Total Carbon and Sulfur Content -
Infrared Absorption Method after Combustion in an Induction Furnace (routine method)
GB/T 20125 Low-alloy Steel - Determination of Multi-element Contents - Inductively
Coupled Plasma Atomic Emission Spectrometric Method
6.1.3 In terms of steel strip, the dimensions are expressed in thickness  width in
millimeters (mm). The letter C may also be added after the number indicating the rolling
width.
Example: 0.26  832C.
6.1.4 The inner diameter of steel coils is 406 mm, 420 mm, 450 mm or 508 mm.
6.2 Permissible Deviations for Dimensions
6.2.1 Thickness
6.2.1.1 The thickness of steel sheet and strip shall satisfy the following requirements:
a) The deviation of thickness measured at the centerline position in the width
direction from the nominal thickness shall not exceed ± 5% of the nominal
thickness.
b) The deviation of thickness measured at a position not less than 6 mm from
the side in the width direction from the nominal thickness is -8% ~ +5% of the
nominal thickness.
c) When the quantity of delivery is greater than 10,000 pieces of steel sheet (or
steel coils of equal length), the permissible deviation between the average
thickness of all steel sheets and the nominal thickness shall not exceed ± 2%
of the nominal thickness.
6.2.1.2 The measurement of thickness is carried out with a micrometer with an
accuracy of 0.001 mm. The measurement result shall be rounded off to 0.001 mm. The
thickness measurement position is any point not less than 6 mm from the side in the
width direction.
6.2.2 Thin edge
6.2.2.1 Thin edge is the thickness change of steel sheet and strip along the width
direction. It is characterized by thickness reduction occurring near the edge of steel
sheet and strip. The deviation between the thickness measured at 6 mm from both
sides of the width direction of the steel sheet and strip and the actual thickness
measured along the centerline of the width direction of the steel sheet and strip shall
not exceed 6.0% of the actual thickness measured at the centerline position.
6.2.2.2 In terms of the measurement of thin edge, use a micrometer to measure 3
points on the same straight line ...
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