GB/T 40339-2021 English PDF

US$404.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 40339-2021: Corrosion of metals and alloys - Guidelines for assessing the significances of stress corrosion cracks detected in service
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 40339-2021	404	Add to Cart	5 days	Corrosion of metals and alloys - Guidelines for assessing the significances of stress corrosion cracks detected in service	Valid

Similar standards

GB/T 41653   GB/T 40299   GB/T 40393   GB/T 20854   GB/T 40338   

Basic data

Standard ID: GB/T 40339-2021 (GB/T40339-2021)
Description (Translated English): Corrosion of metals and alloys - Guidelines for assessing the significances of stress corrosion cracks detected in service
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H25
Word Count Estimation: 22,239
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 40339-2021: Corrosion of metals and alloys - Guidelines for assessing the significances of stress corrosion cracks detected in service

---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.
Corrosion of metals and alloys - Guidelines for assessing the significances of stress corrosion cracks detected in service ICS 77.060 CCSH25 National Standards of People's Republic of China Corrosion of metals and alloys detected in service Guidelines for evaluating the importance of stress corrosion cracking (ISO 21601.2013, IDT) Released on 2021-08-20 2022-03-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Table of contents

Foreword Ⅲ 1 Scope 1 2 Normative references 1 3 Principle 1 4 Characterization of the nature and origin of cracks 1 5 Determining the service status and system history 2 5.1 Stress 2 5.2 Service environment 3 6 Material characteristics 3 6.1 Cold working 3 6.2 Welding 4 6.3 Aging 4 6.4 Microstructure orientation 4 7 KISCC and the prediction of crack growth rate 5 7.1 KISCC 5 7.2 Prediction of crack growth rate below KISCC value 8 7.3 Crack growth in the case of higher than KISCC 8 7.4 Non-propagating cracks 12 7.5 Probability Problem 13 8 Structural integrity assessment 13 9 Improve service conditions to slow down crack propagation 15 9.1 Changing the temperature 15 9.2 Reduce operating stress 16 9.3 Changing the environment/stricter environmental control 16 Reference 17

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. The translation method used in this document is equivalent to ISO 21601.2013 ``Corrosion of metals and alloys detected in service of stress corrosion cracks'' Importance Assessment Guidelines. The Chinese documents that have a consistent correspondence with the international documents of the normative reference documents in this document are as follows. ---GB/T 15970.6-2007 Corrosion stress corrosion test of metals and alloys Part 6.Constant load or constant displacement Preparation and application of pre-crack specimens (ISO 7539-6.2003, IDT) ---GB/T 15970.9-2007 Corrosion stress corrosion test of metals and alloys Part 9.Incremental load or incremental Preparation and application of pre-crack specimens under displacement (ISO 7539-9.2003, IDT) Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents. This document was proposed by the China Iron and Steel Association. This document is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183). Drafting organizations of this document. Shanghai Materials Research Institute, Metallurgical Industry Information Standards Research Institute, National Standard (Beijing) Inspection and Certification Co., Ltd., CRRC Qingdao Sifang Locomotive and Rolling Stock Co., Ltd. The main drafters of this document. Li Guangfu, Hou Jie, Fan Zhigang, Zhang Zhiyi, Sun Menghan, Ji Kaiqiang, Zhai Xiaowei, Sun Xiaoguang, Tian Zijian. Corrosion of metals and alloys detected in service Guidelines for evaluating the importance of stress corrosion cracking

1 Scope

This document provides guidelines for appropriate steps when stress corrosion cracks are detected during equipment service and the impact on structural integrity is assessed. When the consequences of failure are recognized, appropriate risk management-based methods should be used for this assessment. This document is only a guideline, The specific application is not explained in detail.

2 Normative references

The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document. ISO 7539-6 Corrosion stress corrosion test of metals and alloys Part 6.Pre-cracked specimens under constant load and constant displacement Preparation and application (Corrosionofmetalsandaloys-Stresscorrosiontesting-Part 6.Preparationanduseof precrackedspecimensfortestsunderconstantloadorconstantdisplacement) ISO 7539-9 Corrosion of metals and alloys. Stress corrosion test. Part 9.Pre-crack under incremental load or incremental displacement Sample preparation and application (Corrosionofmetalsandaloys-Stresscorrosiontesting-Part 9.Preparationand useofprecrackedspecimensfortestsunderrisingloadorrisingdisplacement)

3 Principle

When a crack is detected during the regular inspection plan of the equipment, in most cases, repair will be initiated within a short period of time, removing the component or Remove the damaged part and re-soldering. However, sometimes the opportunity for repair is limited, and it is necessary to keep the system running normally until the next shutdown to reduce Production loss, in some applications, as long as the work plan is to predict the evolution of cracks, determine the inspection interval, and evaluate the possibility of failure, It can also be considered to allow cracks to exist. This assessment can be combined with the failure result assessment to form a risk-based inspection method. Short-term with cracks Or the challenge for long-term coexistence is to determine when the crack starts, and to establish its relationship with service conditions including transients (that is, to assess whether the crack will Continuous expansion or just a little response to special fluctuations in service conditions), evaluate the driving force of mechanics, and characterize the origin and propagation of cracks. Material state, evaluate laboratory database, and use fracture mechanics or other concepts to transform it into recognizable service operating conditions. When there is a risk of explosive or catastrophic failure, a leak before breaking (leakbeforebreak, LBB) assessment may also be required. but In practice, it is usually for the reasons of operational reliability to check and repair stress corrosion. The purpose of this document is to provide guidelines for the development of a damage assessment technique that includes guidelines for crack growth rate control measures.

4 Characterization of the nature and origin of cracks

The first is to conduct a complete physical evaluation of the crack to determine its shape and size. Pay attention to the uncertainty of the defect size evaluation. Because these values are used for finite element/fracture mechanics analysis. This should include the location of cracks and their local stress concentration, welding points, gaps (Such as fasteners and flange parts) correlation, and the evaluation of the details of the crack path. If more than one crack is shown, pay attention to the crack Density, spacing between cracks and possible future connections of cracks. In addition, it is advisable to make uniform corrosion or pitting damage on the surface condition. ......

Image     

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 40339-2021_English be delivered?

Answer: Upon your order, we will start to translate GB/T 40339-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 40339-2021_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 40339-2021_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.