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GB/T 19350-2012 English PDF (GBT19350-2012)

GB/T 19350-2012 English PDF (GBT19350-2012)

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GB/T 19350-2012: Metallic and other inorganic coatings -- Post-coating treatments of iron or steel to reduce the risk of hydrogen embrittlement
GB/T 19350-2012
Metallic and other inorganic coatings.Post-coating treatments of iron or steel to reduce the risk of hydrogen embrittlement
ICS 25.220.40
A29
National Standards of People's Republic of China
Replacing GB/T 19350-2003
Metal and other inorganic coatings
To reduce the risk of hydrogen embrittlement after coating the treated steel
(ISO 9588..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
3 Terms and definitions 1
4 Requirements 1
5 Elimination of brittleness treatment level 2
Heat treatment after processing 2
Appendix NA (informative appendix) and the normative reference in this standard international documents are consistent with the relationship between the Chinese document 5
Table 1 High-strength steel to eliminate brittle heat treatment level 3
Table 2 Some countries recommend the traditional treatment of high-strength steel to eliminate brittleness heat treatment level 3
Figure 1 treatment of the temperature of 190 ℃ ~ 220 ℃ heat treatment time - tensile strength curve 4
Preface
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 19350-2003 "Metal and other inorganic coatings for the purpose of reducing the risk of hydrogen embrittlement.
Reason ", compared with GB/T 19350-2003, the main technical changes are as follows.
--- modified part of the introduction;
--- modified the scope of Chapter 1;
--- normative reference documents were re-adjusted;
--- amended the requirements of Chapter 4;
--- modified the first 6.1;
--- revised the note of paragraph 6.5;
--- modified Table 1, added Table 2;
--- modified Figure 1.
This standard uses the translation method equivalent to ISO 9588..2007 "metal and other inorganic coatings to reduce the risk of hydrogen embrittlement after coating
Steel treatment ".
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.
--- with the national standard preface to replace the preamble of international standards;
--- "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. Yu Jing, Huang Yefong, Xu Yanfei, Pan ou, Jia Jianxin.
This standard replaced the previous version of the standard release.
--- GB/T 19350-2003.
introduction
When the atoms of hydrogen into the steel and other metals, such as aluminum and titanium alloy, can cause its toughness or carrying capacity loss, or the occurrence of open
(Usually sub-microscopic cracks), or when the applied stress is much lower than the yield strength of the alloy or even lower than the usual design strength of the alloy
Disastrously brittle damage. This phenomenon often occurs in the use of conventional tensile test when the alloy toughness and no significant loss of the situation
This phenomenon of alloy, usually referred to as hydrogen induced hysteresis, hydrogen induced cracking or hydrogen embrittlement. Cleaning, pickling, phosphating, electroplating, self-catalyzing process
And corrosion or cathodic protection in the service of the material will cause hydrogen to penetrate the metal; in the cleaning, pickling, coating before the coating process, such as rolling
Molding, machining and drilling, due to improper selection of lubricants caused by decomposition will lead to hydrogen into the metal; welding or brazing process can also
So that hydrogen infiltration.
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 after coating the treated steel
1 Scope
This standard specifies a method for reducing the degree of hydrogen embrittlement susceptibility or sensitivity that may occur during surface finishes.
The iron and steel heat treatment process specified in this standard can effectively reduce the hydrogen embrittlement susceptibility. These heat treatment processes are after finishing the surface, but at the time
Any secondary conversion film before the process.
The stress relief heat treatment process used after the process but before the surface finish is specified in ISO 9587.
This standard does not apply to fasteners.
Note. Heat treatment does not guarantee the complete elimination of the harmful effects of hydrogen embrittlement.
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 9587 metal and other inorganic coatings for the reduction of hydrogen embrittlement risk of steel pretreatment (Metalicandotherinorganic
coatings-Pretreatmentofironorsteeltoreducetheriskofhydrogenembrittlement
3 terms and definitions
ISO 2080 and the following terms and definitions apply to this document.
3.1
Eliminate brittle heat treatment embrittlement-reliefheattreatment
In a certain temperature range and a certain processing time to achieve without changing the matrix metal metallurgy structure (such as recrystallization) and eliminate the parts have been brittle
Sexual heat treatment.
4 requirements
The treated metal should be subjected to a heat treatment that reduces the risk of hydrogen embrittlement. In any case, the entire temperature of each part shall be of the specified temperature
The heat treatment time is calculated.
Steel pieces and tables with actual tensile strength greater than or equal to 1000 MPa (corresponding hardness 300HV10, 303HB or 31HRC)
Surface hardened parts should be heat treated unless their elimination of brittleness heat treatment is specified as ER-0. Should be avoided in containing alkali or acid
The pretreatment of the cathodic processing step is performed. In addition, for a tensile strength higher than 1400MPa (the corresponding hardness of 425HV10,401HB
Or 43HRC) steel parts recommended the use of high cathode e...
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