GB/T 25151.2-2010 English PDF

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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
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 25151.2-2010	139	Add to Cart	3 days	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	Valid

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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

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
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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