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GB/T 19349-2012 English PDF (GBT19349-2012)

GB/T 19349-2012 English PDF (GBT19349-2012)

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GB/T 19349-2012: Metallic and other inorganic coatings -- Pretreatment of iron or steel to reduce the risk of hydrogen embrittlement
GB/T 19349-2012
Metallic and other inorganic coatings.Pretreatment of iron or steel to reduce the risk of hydrogen embrittlement
ISC25.220.40
A29
National Standards of People's Republic of China
Replace GB/T 19349-2003
Metal and other inorganic coatings
To reduce the risk of hydrogen embrittlement of steel pretreatment
(ISO 9587..2007, IDT)
2012-12-31 release
2013-10-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People 's Republic of China
China National Standardization Management Committee released
Directory
Preface III
Introduction IV
1 range 1
2 normative reference document 1
Terminology and definition
4 Requirements 1
5 steel classification 2
Eliminate stress 2
Appendix NA (informative appendix) and the normative reference in this standard international documents have a consistent correspondence between China's document 4
Table 1 high strength steel to eliminate stress requirements level 2
Table 2 Some countries recommend the traditional treatment of high strength steel to eliminate stress requirements level 2
Preface
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 19349-2003 "metal and other inorganic coatings to reduce the risk of hydrogen embrittlement of steel pretreatment", and
GB/T 19349-2003 compared to the main technical changes are as follows.
--- modified the introduction;
--- modified the scope of Chapter 1;
--- normative reference documents have been re-adjusted;
--- modified the first 6.1;
--- modified Table 1, added Table 2.
This standard uses the translation method equivalent to ISO 9587..2007 "Metal and other inorganic coatings to reduce the risk of hydrogen embrittlement.
deal with".
See Appendix NA for our documents in accordance with the normative correspondence between the normative references in this standard.
This standard has made the following editorial changes.
--- the preamble of the international standard is replaced by the preamble of the national standard;
--- "this standard" instead of "this international standard".
- the addition of the data Appendix NA, and the normative reference in this standard international documents have a consistent correspondence between the Chinese documents.
This standard is proposed by the China Machinery Industry Federation.
This standard is nationalized by the National Standardization Technical Committee on Metals and Nonmetallic Coatings (SAC/TC57).
The drafting of this standard unit. Wuhan Institute of Materials Protection, Wuhan material warranty electroplating technology productivity promotion center.
The main drafters of this standard. Huang Yefong, Yu Jing, Xu Yanfei, Pan ou, Jia Jianxin.
introduction
When the atoms of hydrogen into the steel and some other metals, such as aluminum and titanium alloy, can cause its toughness or carrying capacity loss or cracking
(Usually sub-microscopic cracks), or in the external stress is much lower than the yield strength of the alloy even lower than the usual design strength of the alloy when the alloy disaster
Difficult to brittle damage. This phenomenon often occurs in the use of traditional tensile test determination of alloy toughness and no significant loss of the case,
This phenomenon of alloy, commonly known as hydrogen induced hysteresis, hydrogen cracking or hydrogen embrittlement. Cleaning, pickling, phosphating, electroplating, autocatalytic processes and materials
Corrosive reaction or cathodic protection in the service will cause hydrogen to penetrate into the metal; in the cleaning, pickling, coating before the coating process, such as rolling into
Type, machining and drilling, due to the improper selection of lubricants caused by decomposition will lead to hydrogen infiltration of metal; welding or brazing process can also make
Hydrogen infiltration. Hardening heat treatment after mechanical processing, grinding, cold forming or cold straightening of the parts of the hydrogen embrittlement damage is particularly sensitive.
The heat treatment reduces the hydrogen embrittlement susceptibility caused by the tensile stress generated by the absorbed hydrogen atoms and/or the processing. Heat treatment time - temperature
The degree of relationship depends on the composition of the steel, the structure and the coating type and coating method. For most high strength steels, the heat treatment effect
With the reduction of processing time and the temperature drop sharply.
This standard is intended to be used in the direction of electroplating, supply or processing of technical requirements, these requirements marked on the parts or purchase orders.
Metal and other inorganic coatings
To reduce the risk of hydrogen embrittlement of steel pretreatment
1 Scope
This standard specifies the requirements for high-strength steel to eliminate stress heat treatment in order to reduce the subsequent pretreatment, electroplating, electroless plating, chemical transfer
And the degree of hydrogen embrittlement sensitivity or sensitivity in the process of phosphating. This standard applies to heat at 190 ° C to 230 ° C or higher
Processing without causing its performance to degrade the steel (see 6.2).
The heat treatment process specified in this standard reduces the tensile strength equal to or higher than 1000MPa and after the heat treatment by mechanical processing, grinding,
The hydrogen embrittlement susceptibility of cold formed or cold straightened steel is effective. The heat treatment process is used in any step where hydrogen may be present
Before, just as the cleaning process used for electroplating, electroless plating and other chemical cover before the same operation.
This standard does not apply to fasteners.
2 normative reference documents
The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article
Pieces. For undated references, the latest edition (including all modifications) applies to this document.
ISO 2080 Metal and other inorganic coatings Surface treatment, metals and other inorganic coatings Terminology (Metalicandother
inorganiccoatings-Surfacetreatment, metalicandotherinorganiccoatings-Vocabulary)
ISO 12686 Metal and other inorganic coatings Electroplated nickel, self-catalyzed nickel plating, chrome plated and final finish Automatic control of shot peening
(Metalicandotherinorganiccoatings-Automatedcontroledshot-peeningofmetalic
articlespriortonickel, autocatalyticnickelorchromiumplating, orasafinalfinish
3 Terms and Definitions
ISO 2080 and the following terms and definitions apply to this document.
3.1
Stress-relief stress treatment
In a certain temperature range and a certain processing time to achieve without changing the matrix metal metallurgical structure (such as recrystallization) and to eliminate the parts to be plated
Heat treatment of force.
4 requirements
The substrate metal should be treated in accordance with Table 1 and Table 2 to reduce the risk of hydrogen embrittlement. In any case, should be in the whole of each part
The heat treatment time is calculated when the specified temperature is reached.
Table 1 High strength steel elimination stress requirements level (see 4, 5 and 6 for details)
Grade steel tensile strength Rm/MPa temperature/℃ minimum time/h
SR-0 does not eliminate stress heat treatment
SR-1 Rm and gt; 1800.200 to 230 and lt; 24 and gt;
SR-3 1401? Rm? 1800.200 to 23018
SR-6 1000? Rm? 1400 to 230?
SR-8 surface hardening parts < 1400 130 ~ 160 8
Table 2 Some c...
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