GB/T 17432-2012 PDF in English

GB/T 17432-2012 (GB/T17432-2012, GBT 17432-2012, GBT17432-2012)
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GB/T 17432-2012130 Add to Cart Auto, < 3 mins Methods of sampling for analyzing the chemical composition of wrought aluminum and aluminum alloys Valid

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GB/T17432-2012 (GBT17432-2012): PDF in English

GB/T 17432-2012
ICS 77.120.10
H 61
Replacing GB/T 17432-1998
Methods for sampling for analyzing the chemical
composition of wrought aluminum and aluminum alloys
Issued by: General Administration of Quality Supervision, Inspection and
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions... 4 
4 Reagents ... 4 
5 Main tools and equipment ... 5 
6 Sample selection ... 5 
7 Specimen preparation ... 7 
8 Specimen storage ... 9 
9 Re-sampling ... 9 
Methods for sampling for analyzing the chemical
composition of wrought aluminum and aluminum alloys
1 Scope
This Standard specifies terms and definitions of sampling methods for chemical
composition analysis of wrought aluminum and aluminum alloys, reagents, main tools
and equipment, sample selection, specimen preparation, storage and resampling.
This Standard applies to the preparation method of specimens for chemical composition
analysis of deformed aluminum and aluminum alloy products and semi-finished
products. The preparation of specimens for chemical composition analysis of cast
aluminum alloy ingots, aluminum master alloys, other metal and alloy products or semi-
finished products may also refer to the methods specified in this Standard.
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 3190, Wrought aluminium and aluminium alloys - Chemical composition
GB/T 8005.1, Aluminium and aluminium alloy terms and definitions - Part 1:
Product and method of processing and treatment
GB/T 8005.2, Terms of aluminium and aluminium alloys - Part 2: Chemical analysis
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 8005.1
and GB/T 8005.2 apply.
4 Reagents
4.1 Acetone (ρ 0.79g/L).
4.2 Anhydrous ethanol (ρ 0.79g/L).
5 Main tools and equipment
5.1 Sampling spoon: The surface is firmly attached, uniform and complete, clean (no
metal residues and other contaminants), dry and heat-resistant (during the sampling
process, the film will not fall off due to high temperature) coating. Enough to hold the
molten metal required to pour a sample.
5.2 Sampling mold: It is made of steel or cast iron. There is no pores, rust and residue
on the surface of the inner cavity. The surface of the inner cavity shall be passivated
after sandblasting. The shape of the inner cavity shall be a casting sample with a smooth
and uniform surface and a size that meets the requirements of the chemical composition
analysis method.
5.3 Sample preparation equipment: Clean drills, lathes, milling machines, tools, etc.
Cemented carbide tools shall be used to prepare samples. If steel tools are used, iron
adhering to them shall be removed before sample preparation.
6 Sample selection
6.1 Sampling during casting (or casting-rolling)
6.1.1 When casting (or casting-rolling) is stable, use the sampling scoop (5.1) or a
skimming tool to push away any scum in the sampling area in the launder. Immediately
insert the sampling spoon (5.1) diagonally into the cleaning area below the liquid level
of the launder. Quickly stir. When the sampling scoop (5.1) reaches the melt
temperature, scoop and retract the sample. The molten metal scooped by the sampling
scoop (5.1) shall not come into contact with solid metal, slag, moisture, iron or dust.
6.1.2 Immediately pour the molten metal scooped by the sampling spoon (5.1) into the
heated sampling mold (5.2) at a uniform and gentle flow rate. Use molten metal to drive
out all the air in the sampling mold (5.2) until the molten metal fills the gate. When
injecting molten metal, the sampling die (5.2) shall not be inclined to prevent the molten
metal from overflowing the injection port.
NOTE: The sampling mould shall preferably be heated by pre-casting a sample (not the test sample)
in the sampling mould.
6.1.3 After the molten metal in the sampling mold (5.2) has slowly solidified without
stirring, open the sampling mold (5.2) to take out the sample. The surface of the sample
shall have no shrinkage cavities, no inclusions, no slag inclusions, no cracks, and the
surface is not rough.
6.1.4 At least one sample is drawn per melt. For continuous casting, at least one sample
shall be taken per shift.