GB/T 38713-2020 English PDF (GBT38713-2020)

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GB/T 38713-2020: Medium manganese steel plate for offshore platform structure
GB/T 38713-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.50
H 46
Medium manganese steel plate for offshore platform
structure
ISSUED ON: MARCH 31, 2020
IMPLEMENTED ON: OCTOBER 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Designation representation ... 6 
4 Order content ... 7 
5 Size, shape, weight ... 7 
6 Technical requirements ... 7 
7 Test method ... 11 
8 Inspection rules ... 13 
9 Packaging, marking and quality certificate ... 13 
Medium manganese steel plate for offshore platform
structure
1 Scope
This Standard specifies the designation representation, order content, size,
shape, weight, technical requirements, test methods, inspection rules,
packaging, marking and quality certificates of medium manganese steel plate
for offshore platform structure.
This Standard applies to medium manganese steel plates (hereinafter referred
to as steel plates) whose thickness is 20 mm ~ 150 mm for offshore platform
structure.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
GB/T 222, Permissible tolerances for chemical composition of steel products
GB/T 223.4, Iron, steel and alloy - Determination of manganese content -
Potentiometric or visual titration method
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 aluminium 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 223.14, Methods for chemical analysis of iron, steel and alloy - The N-
benzoy-N-phenylhydroxylamine extraction photometric method for the
determination of vanadium content
GB/T 223.19, Methods for chemical analysis of iron, steel and alloy - The
neocuproine-chloroform extraction photometric 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 223.37, Methods for chemical analysis of iron, steel and alloy - The
indophenol blue photometric methods for the determination of nitrogen
content after distillation separation
GB/T 223.40, Iron, steel and alloy - Determination of niobium content by the
sulphochlorophenol S spectrophotometric method
GB/T 223.62, Methods for chemical analysis of iron, steel and alloy - The
butyl acetate extraction photometric method for the determination of
phosphorus content
GB/T 223.67, Iron, Steel and Alloy - Determination of Sulfur Content -
Methylene Blue Spectrophotometric Method
GB/T 223.69, Iron, Steel and Alloy - Determination of Carbon Contents - Gas-
volumetric - Method after Combustion in the Pipe Furnace
GB/T 223.72, Iron, steel and alloy - Determination of sulfur content -
Gravimetric method
GB/T 228.1, Metallic materials - Tensile testing - Part 1: Method of test at
room temperature
GB/T 229, Metallic materials - Charpy pendulum impact test method
GB/T 247, General rule of package, mark and certification for steel plates
(sheets) and strips
GB/T 709-2019, Dimension shape weight and tolerances for hot-rolled steel
plates and sheets
GB/T 2970, Method for ultrasonic testing of thicker steel plates
GB/T 2975, Steel and steel products - Location and preparation of samples
and test pieces for mechanical testing
GB/T 4336, Carbon and low-alloy steel - Determination of multi-element
contents - Spark discharge atomic emission spectrometric method (routine
method)
GB/T 5313, Steel plate with through-thickness characteristics
4 Order content
The contract or order in accordance with this Standard shall include the
following information:
a) reference to this Standard;
b) designation;
c) specification;
d) delivery status;
e) weight (quantity);
f) size and shape accuracy;
g) special requirements.
5 Size, shape, weight
5.1 Size, shape and allowable deviation
5.1.1 The size, shape, weight and allowable deviation of the steel plate shall
meet the requirements of GB/T 709-2019. The thickness deviation of the steel
plate shall comply with the provisions of Grade-B deviation in GB/T 709-2019;
the average thickness of the steel plate is not less than the nominal thickness.
5.1.2 By agreement between the supplier and the buyer, steel plates of other
sizes, shapes and allowable deviations can be supplied, which shall be
specified in the contract.
5.2 Weight
The steel plate is calculated based on the theoretical weight. The thickness that
is used for the theoretical weight is the arithmetic average of the maximum
thickness and minimum thicknesses that are allowed for the steel plate; the
density of the steel is 7.85 g/cm3.
6 Technical requirements
6.1 Designation and chemical composition
6.1.1 The steel designation and chemical composition (melting analysis) shall
comply with the requirements of Table 1.
After the agreement between the supplier and the buyer, the buyer can make
other special requirements on the strain aging impact and weldability of the
steel plate, which are specified in the contract.
7 Test method
7.1 Chemical composition
The chemical composition analysis of steel shall be carried out according to
GB/T 4336, GB/T 20123, GB/T 20124, GB/T 20125 or other general methods;
the arbitration shall be carried out according to GB/T 223.4, GB/T 223.5, GB/T
223.9, GB/T 223.11, GB/T 223.14, GB/T 223.19, GB/T 223.23, GB/T 223.26,
GB/T 223.37, GB/T 223.40, GB/T 223.62, GB/T 223 .67, GB/T 223.69 and GB/T
223.72.
7.2 Sampling method
7.2.1 Prepare tensile test samples. When the thickness of the steel is not
greater than 40 mm, take a full-section rectangular sample, of which the width
is 25 mm. When the capacity of the testing machine is insufficient, it can be
processed on one rolling surface of the sample to reduce the thickness to 25
mm. When the thickness of the steel is greater than 40 mm, take a circular
section sample, the axis of which is located at 1/4 of the thickness of the steel
plate or as close to this position as possible; the diameter of the sample is 14
mm; according to the capacity of the testing machine, a full-section sample can
be used. For steel plates whose thickness is greater than 100 mm, add 1/2
thickness tensile test; take a circular section sample, the axis of which is located
at 1/2 of the steel plate thickness.
7.2.2 Prepare the impact test sample. When the thickness of the steel is less
than 40 mm, the impact sample shall be a near-surface sample; the edge of the
sample is less than 2 mm from a rolling surface. When the thickness of the steel
is not less than 40 mm, the sample axis shall be located at 1/4 thickness of the
steel or as close to this position as possible. For steel plates whose thickness
is greater than 50 mm, add 1/2 thickness impact test; its a...