YS/T 492-2021 English PDF (YST492-2021)

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YS/T 492-2021: Element additive for aluminum and aluminum alloys
YS/T 492-2021
YS
NONFERROUS INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.10
CCS H 30
Replacing YS/T 492-2012
Element additive for aluminum and aluminum alloys
ISSUED ON: AUGUST 21, 2021
IMPLEMENTED ON: FEBRUARY 01, 2022
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Product categories ... 6
5 Quality assurance ... 8
6 Requirements ... 8
7 Test methods ... 13
8 Inspection rules ... 15
9 Signs, packaging, transportation, storage, quality certificate ... 18
10 Contents of order form (or contract) ... 20
Appendix A (Informative) Quality assurance ... 21
Appendix B (Normative) Determination of iron content in iron additives ... 23
Appendix C (Normative) Determination of manganese content in manganese additives
... 26
Appendix D (Normative) Determination of copper content in copper type additives 29
Appendix E (Normative) Determination of chromium content in chromium type
additives ... 32
Appendix F (Normative) Determination of titanium content in titanium type additives
... 38
Appendix G (Normative) Determination of nickel content in nickel type additives .. 40
Appendix H (Normative) Determination of impurity content of aluminum type
additives ... 43
Appendix I (Normative) Determination of moisture content of additives ... 51
Appendix J (Normative) Determination of casting yield ... 53
Appendix K (Normative) Drawing of casting yield curve ... 56
References ... 60
Element additive for aluminum and aluminum alloys
1 Scope
This document stipulates the product classification, quality assurance, requirements,
test methods, inspection rules and markings, packaging, transportation, storage, quality
certificate and order form (or contract) content of element additives for aluminum and
aluminum alloy.
This document applies to additives for formulating or adjusting the chemical
composition of aluminum and aluminum alloys (hereinafter referred to as "additives").
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. Among them, for dated reference
documents, only the version corresponding to the date applies to this document; for
undated reference documents, the latest version (including all amendments) applies to
this document.
GB/T 3199 Wrought aluminium and aluminium alloy products - Packing, marking,
transporting and storing
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 7999 Optical emission spectrometric analysis method of aluminum and
aluminum alloys
GB/T 8170 Rules of rounding off for numerical values and expression and judgement
of limiting values
GB/T 17432 Methods for sampling for analyzing the chemical composition of
wrought aluminum and aluminum alloys
GB/T 20975 (all parts) Methods for chemical analysis of aluminium and aluminium
alloys
YS/T 491 Flux for aluminium and aluminium alloy
3 Terms and definitions
There are no terms or definitions to be defined in this document.
6.7 Powder content
The content of round cake aluminum type additive powder shall not exceed 1%; it shall
not exceed 3% for other types.
6.8 Appearance quality
Additives shall not be deliquescent.
7 Test methods
7.1 Chemical composition
7.1.1 The analysis method for the main element content of additives shall comply with
the provisions of Appendix B ~ Appendix G.
7.1.2 The analysis method for the fluorine content of aluminum additives shall be
determined, through negotiation between the supplier and the purchaser. The analysis
method for the content of other impurity elements shall comply with the provisions of
Appendix H.
7.1.3 Routine analysis is only conducted on elements with specified numerical values
outside the “Other” column in Tables 2 ~ 7. When it is suspected that the mass fraction
of unconventional analysis elements exceeds the limit value of this document, the
producer can analyze these elements; the analysis method shall be determined through
negotiation between the supplier and the buyer.
7.1.4 The rounding off comparison method is used to determine the analytical value.
The numerical rounding rules are in accordance with the provisions of GB/T 8170. The
rounding digits are consistent with the limit digits in Tables 2 ~ 7 of this document.
7.2 Moisture
The moisture content of additives shall be determined according to the method specified
in Appendix I.
7.3 Density
7.3.1 Weigh the mass of the specimen, recorded it as ma.
7.3.2 Measure the diameter of the specimen, recorded as D. Measure the thickness of
the specimen, recorded as T.
7.3.3 Calculate the density ρ of the specimen according to formula (1), in grams per
cubic centimeter (g/cm3).
take double quantity of samples from the batch of products (including the batch of
products represented by the unqualified sample) for repeated testing. If all repeated test
results are qualified, the batch of products will be deemed qualified. If there are still
sample fractures that are unqualified in the repeated test results, the batch of products
will be deemed unqualified.
8.7.6 When the fracture of any sample fails to meet the standard, it shall take double
quantity of samples from the batch of products (including the batch of products
represented by the unqualified sample) for repeated testing. If all repeated test results
are qualified, the batch of products will be deemed qualified. If there are still sample
fractures that are unqualified in the repeated test results, the batch of products will be
deemed unqualified.
8.7.7 When the powder content of any sample fails to meet the standard, it shall take
double quantity of samples from the batch of products (including the batch of products
represented by the unqualified sample) for repeated testing. If all repeated test results
are qualified, the batch of products will be deemed qualified. If there are still sample
fractures that are unqualified in the repeated test results, the batch of products will be
deemed unqualified.
8.7.8 When the appearance quality of any sample is unqualified, it shall take double
quantity of samples from the batch of products (including the batch of products
represented by the unqualified sample) for repeated testing. If all repeated test results
are qualified, the batch of products will be deemed qualified. If there are still samples
that are unqualified in the repeated test results, the batch of products will be deemed
unqualified. Upon agreement between the supplier and the buyer, the supplier is
allowed to inspect piece by piece and deliver the qualified products.
9 Signs, packaging, transportation, storage, quality
certificate
9.1 Signs
9.1.1 Product signs
Print the following content identification on the products that have passed the inspection
(OR affix a label containing the following content):
a) Supplier’s name and address;
b) Product name;
c) The inspection seal of the supplier’s quality inspection department (or the
signature or seal of the quality inspection personnel);
Appendix B
(Normative)
Determination of iron content in iron additives
B.1 Summary of methods
In an acidic solution, divalent iron ions are directly titrated with a standard solution of
potassium dichromate. The excess potassium...