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GB/T 25151.2-2010: Fabrication and inspection method for high pressure urea equipment -- Part 2: Selective corrosion examination and metallography examination for ultra-low carbon chromated nickel molybdenum austenitic stainless steel of urea grade
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| GB/T 25151.2-2010 | English | 139 |
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Fabrication and inspection method for high pressure urea equipment -- Part 2: Selective corrosion examination and metallography examination for ultra-low carbon chromated nickel molybdenum austenitic stainless steel of urea grade
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GB/T 25151.2-2010
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Basic data | Standard ID | GB/T 25151.2-2010 (GB/T25151.2-2010) | | Description (Translated English) | Fabrication and inspection method for high pressure urea equipment -- Part 2: Selective corrosion examination and metallography examination for ultra-low carbon chromated nickel molybdenum austenitic stainless steel of urea grade | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G93 | | Classification of International Standard | 71.120.10; 75.180.20; 23.020.30 | | Word Count Estimation | 6,694 | | Date of Issue | 2010-09-26 | | Date of Implementation | 2011-03-01 | | Regulation (derived from) | National Standard Approval Announcement 2010 No.6 (Total No.161) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the sample urea grade ultra-low carbon stainless austenitic chromium- nickel-aluminum and microstructure of selective etching depth examination of selected, production, inspection items and methods. This section applies to inter- urea grade ultra-low carbon chromium-nickel austenitic stainless platinum crystal selective corrosion inspection after the corrosion test and metallographic examination. | GB/T 25151.2-2010: Fabrication and inspection method for high pressure urea equipment -- Part 2: Selective corrosion examination and metallography examination for ultra-low carbon chromated nickel molybdenum austenitic stainless steel of urea grade
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Fabrication and inspection method for high pressure urea equipment Part 2. Selective corrosion examination and metallography examination for ultra low-carbon chromated nickel molybdenum austenitic stainless steel of urea grade
ICS 71.120.10; 75.180.20; 23.020.30
G93
National Standards of People's Republic of China
Urea manufacturing high pressure equipment inspection methods
Part 2. Urea grade ultra-low carbon austenitic chromium-nickel-molybdenum
Stainless selective corrosion inspection and metallographic examination
Part 2. Selectivecorrosionexaminationandmetalographyexamination
Issued on. 2010-09-26
2011-03-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 25151 "high pressure urea equipment manufacturing test method" is divided into six parts.
--- Part 1. Stainless steel with pole automatic surfacing ultrasonic testing;
--- Part 2. Urea grade ultra-low carbon chromium-nickel-molybdenum austenitic stainless steel selective corrosion inspection and metallographic examination;
--- Part 3. Urea grade ultra-low carbon chromium-nickel-molybdenum austenitic stainless steel to intergranular corrosion tendency test;
--- Part 4. urea grade ultra-low carbon chromium-nickel-molybdenum austenitic stainless steel to intergranular corrosion tendency test specimens prepared to take;
--- Part 5. High-voltage devices urea ammonia leak test methods;
--- Part 6. High-voltage devices urea helium leak test methods.
This section GB/T 25151 Part 2.
Appendix A of this section is an informative annex.
This part is proposed by the China Petroleum and Chemical Industry Association.
This part of the National Chemical Machinery and Equipment Standardization Technical Committee (SAC/TC429) centralized.
This section drafted by. China Petrochemical Group Nanjing Chemical Industry Co., Ltd. Chemical Machinery Plant.
The main drafters of this section. Ren Hui.
Urea manufacturing high pressure equipment inspection methods
Part 2. Urea grade ultra-low carbon austenitic chromium-nickel-molybdenum
Stainless selective corrosion inspection and metallographic examination
1 Scope
This section GB/T 25151 specifies the urea grade ultra-low carbon chromium-nickel-molybdenum austenitic stainless steel microstructure and selective etching depth inspection
Sample selection, production, inspection items and methods.
This section applies to inter-urea grade ultra-low carbon chromium-nickel-molybdenum austenitic stainless steel grain inspection selective etching after the corrosion test and metallographic examination.
2 Sample selection and production
Select a sample of 2.1
Binocular stereoscopic microscope to check the sample surface for selective etching sample checks, should be 10 to 20 times, and to identify the most serious rot
Pitting, and to locate this point intercept cross-section (see Figure 1), if the sample surface is difficult to determine the most severe corrosion at the site point, reference should surface around
Corrosion determined. When as yet found, in the direction shown in Figure 1 press intercept any parallel sections (a), b), c), d), e)) or any interception
A radial section (f), g), h)).
a) a sample plate b) SMAW welding sample c) SMAW welding and strip cladding specimens
d) automatic strip cladding specimens e) welded joint specimens
Corrosion specimen cross-sectional position between different crystal Figure 1
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