ImageVerifierCode 换一换
格式:PDF , 页数:19 ,大小:130.17KB ,
资源ID:541937      下载积分:10000 积分
快捷下载
登录下载
邮箱/手机:
温馨提示:
如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
如填写123,账号就是123,密码也是123。
特别说明:
请自助下载,系统不会自动发送文件的哦; 如果您已付费,想二次下载,请登录后访问:我的下载记录
支付方式: 支付宝扫码支付 微信扫码支付   
注意:如需开发票,请勿充值!
验证码:   换一换

加入VIP,免费下载
 

温馨提示:由于个人手机设置不同,如果发现不能下载,请复制以下地址【http://www.mydoc123.com/d-541937.html】到电脑端继续下载(重复下载不扣费)。

已注册用户请登录:
账号:
密码:
验证码:   换一换
  忘记密码?
三方登录: 微信登录  

下载须知

1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。
2: 试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。
3: 文件的所有权益归上传用户所有。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 本站仅提供交流平台,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。

版权提示 | 免责声明

本文(AWS D10 8-1996 Recommended Practices for Welding of Chromium-Molybdenum Steel Piping and Tubing《铬钼合金钢管焊接推荐惯例》.pdf)为本站会员(feelhesitate105)主动上传,麦多课文库仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文库(发送邮件至master@mydoc123.com或直接QQ联系客服),我们立即给予删除!

AWS D10 8-1996 Recommended Practices for Welding of Chromium-Molybdenum Steel Piping and Tubing《铬钼合金钢管焊接推荐惯例》.pdf

1、RecommendedPractices for Welding ofChromium-MolybdenumSteel Piping andTubingANSI/AWS D10.8-96An American National Standard550 N.W. LeJeune Road, Miami, Florida 33126ANSI/AWS D10.8-96An American National StandardApproved byAmerican National Standards InstituteDateRecommended Practices for Welding of

2、Chromium-Molybdenum Steel Piping and TubingSupersedes AWS D10.8-86Prepared by AWS Committee on Piping and TubingUnder the Direction of AWS Technical Activities CommitteeApproved by AWS Board of DirectorsAbstractThis document presents recommendations for welding chromium-molybdenum steel pipe and tub

3、ing to itself and to various other materials. Subjects covered in detail are filler metal selection, joint design, preheating, and postheating. Particular emphasis is placed on the importance of maintaining interpass temperature and dangers inherent in interrupted heating cycles.Key Words Chromium-m

4、olybdenum steel pipe, chromium-molybdenum steel tubingStatement on Use of AWS StandardsAll standards (codes, specifications, recommended practices, methods, classifications, and guides) of the American Welding Society are voluntary consensus standards that have been developed in accordance with the

5、rules of the Ameri-can National Standards Institute. When AWS standards are either incorporated in, or made part of, documents that are in-cluded in federal or state laws and regulations, or the regulations of other governmental bodies, their provisions carry the full legal authority of the statute.

6、 In such cases, any changes in those AWS standards must be approved by the govern-mental body having statutory jurisdiction before they can become a part of those laws and regulations. In all cases, these standards carry the full legal authority of the contract or other document that invokes the AWS

7、 standards. Where this contractual relationship exists, changes in or deviations from requirements of an AWS standard must be by agreement between the contracting parties.International Standard Book Number: 0-87171-500-7American Welding Society, 550 N.W. LeJeune Road, Miami, FL 33126 1996 by America

8、n Welding Society. All rights reserved Printed in the United States of AmericaNote: The primary purpose of AWS is to serve and benefit its members. To this end, AWS provides a forum for the ex-change, consideration, and discussion of ideas and proposals that are relevant to the welding industry and

9、the consensus of which forms the basis for these standards. By providing such a forum, AWS does not assume any duties to which a user of these standards may be required to adhere. By publishing this standard, the American Welding Society does not insure anyone using the information it contains again

10、st any liability arising from that use. Publication of a standard by the American Welding Society does not carry with it any right to make, use, or sell any patented items. Users of the in-formation in this standard should make an independent, substantiating investigation of the validity of that inf

11、ormation for their particular use and the patent status of any item referred to herein.With regard to technical inquiries made concerning AWS standards, oral opinions on AWS standards may be rendered. However, such opinions represent only the personal opinions of the particular individuals giving th

12、em. These individuals do not speak on behalf of AWS, nor do these oral opinions constitute official or unofficial opinions or interpretations of AWS. In addition, oral opinions are informal and should not be used as a substitute for an official interpretation.This standard is subject to revision at

13、any time by the AWS Piping and Tubing Committee. It must be reviewed every five years and if not revised, it must be either reapproved or withdrawn. Comments (recommendations, additions, or de-letions) and any pertinent data that may be of use in improving this standard are requested and should be a

14、ddressed to AWS Headquarters. Such comments will receive careful consideration by the AWS Piping and Tubing Committee and the author of the comments will be informed of the Committees response to the comments. Guests are invited to attend all meetings of the AWS Piping and Tubing Committee to expres

15、s their comments verbally. Procedures for appeal of an adverse decision concerning all such comments are provided in the Rules of Operation of the Technical Activities Com-mittee. A copy of these Rules can be obtained from the American Welding Society, 550 N.W. LeJeune Road, Miami, FL 33126.iii*Advi

16、sor*DeceasedPersonnelAWS Committee on Piping and TubingW. L. Ballis, Chairman Columbia Gas DistributionW. J. Sperko, 1st Vice Chairman Sperko Engineering ServicesM. C. Shepard, 2nd Vice Chairman Litwin Engineers and ConstructorsJ. K. Lambert, Secretary American Welding SocietyF. G. Ar m a o Aluminum

17、 Company of AmericaC. R. Brashears Alyeska Pipeline Service CompanyD. J. Connell Detroit EdisonH. W. Ebert Exxon Research and Engineering CompanyW. R. Etie ConsultantJ. E. Fisher INSECOE. A. Harwart* ConsultantG. K. Hickox ConsultantJ. Hill Hill Technical Services, IncorporatedJ. E. Hinkel Lincoln E

18、lectricConsultantR. B. Kadiyala* Techalloy CompanyM. P. Lang U. A. Local 514L. A. Maier, Jr. ConsultantB. B. McDonald United AssociationJ. W. McEnerney Cooperheat, IncorporatedJ. W. Moeller* ConsultantW. Newell Newell and AssociatesJ. S. Pastorok Perry Nuclear Power PlantL. Seum Phoenix ServicesCons

19、ultantE. G. Shifrin* ConsultantG. K. Sosnin ConsultantP. A . Te w s CRC-Evans Automatic WeldingJ. Tidwell Fluor DanielG. J. Tucker AIM Testing LaboratoryW. D. Watson, Jr. Roberts EngineeringR. R. Wright Moody-Tottrup International, IncorporatedAWS Subcommittee on Chromium-Molybdenum Steel PipingH. W

20、. Ebert, Chairman Exxon Research and Engineering CompanyJ. K. Lambert, Secretary American Welding SocietyD. J. Connell Detroit EdisonW. R. Etie ConsultantE. A. Harwart* ConsultantR. B. Kadiyala* Techalloy CompanyJ. W. McEnerney Cooperheat, IncorporatedL. Seum Phoenix ServicesConsultantW. Newell Newe

21、ll and AssociatesM. C. Shepard Litwin Engineers and ConstructorsW. J. Sperko Sperko Engineering ServicesJ. Tidwell Fluor DanielivForeword(This Foreword is not a part of ANSI/AWS D10.8-96, Recommended Practices for Welding of Chromium-Molybdenum Steel Piping and Tubing, but is included for informatio

22、n purposes only).The chromium-molybdenum (Cr-Mo) steels considered in this document contain from one-half to nine percent chromium and some molybdenum. These elements increase the corrosion and oxidation resistance of steel and impart greater strength and microstructural stability at elevated temper

23、atures.Since such alloy additions also increase hardenability, steps must be taken to prevent cracking during and after solid-ification by reducing stresses, limiting hydrogen content, and assuring adequate ductility. These steps include limiting the addition of those elements which increase hardena

24、bility, preheating, using filler metals and processes which mini-mize the addition of hydrogen to the weld, and postweld heat treatment (PWHT).When these alloys are used in a corrosive environment, care should be taken to eliminate crevices and reduce hardness. When the service conditions include ex

25、posure to high temperatures, consideration must also be given to the need for increased creep strength and possible problems due to temper embrittlement and stresses resulting from differential ther-mal expansion. In addition, when joining different chromium-molybdenum steels to each other or to aus

26、tenitic chromium-nickel stainless steels, consideration must be given to dilution during welding, diffusion of elements during service, and differences in thermal expansion and corrosion resistance.The selection of base metals is beyond the scope of this document; however, the selection of filler me

27、tals for various base metal combinations and suggested preheating and postweld heat treating temperatures are included. This recom-mended practice discusses the special considerations which are advisable when preheating and post heating. A more complete treatment of this subject is to be found in AN

28、SI/AWS D10.10, Recommended Practices for Local Heating of Welds in Piping and Tubing. Also not discussed in detail are the methods of root-pass welding. These are treated fully in ANSI/AWS D10.11, Recommended Practices for Root Pass Welding of Pipe Without Backing.Comments and suggestions are welcom

29、e. They should be addressed to the Secretary, Committee on Piping and Tubing, American Welding Society, 550 N.W. LeJeune Road, Miami, FL 33126.vTable of ContentsPage No.Personnel iiiForeword ivList of Tables .viList of Figures .vi1. Scope .12. Base Metals .12.1 General.12.2 Base-Metal Addition23. Fi

30、ller Metals 23.1 General.23.2 Low Hydrogen.23.3 Backing Rings and Consumable Inserts 43.4 Applications.43.5 Other Filler Metals.54. Joint Design and Preparation.54.1 Standard Joint Preparations .54.2 Root-Pass Considerations 54.3 Fit-Up.55. Preheating55.1 General.55.2 Interruption of Heating Cycle65

31、.3 Moisture and Other Materials Containing Hydrogen 75.4 Joint Restraint 75.5 Mass of the Base Metal76. Postweld Heat Treatment (PWHT) .76.1 General.76.2 PWHT Temperatures .76.3 PWHT Holding Time.76.4 Heating and Cooling86.5 Local PWHT86.6 Quality Control of PWHT .97. Repair and Maintenance Welding

32、of Service Exposed Cr-Mo Piping and Tubing.97.1 Base-Metal Contamination 97.2 Temper Embrittlement.97.3 Relaxation of PWHT Requirements 108. Safe Practices 10Annex A List of Safety Related References11Document List.12viList of TablesTable Page No.1 Base Metal Abbreviations12 Suggested Filler Metals

33、for Various Base Metal Combinations 33 Suggested Minimum Preheat Temperatures for Various Base Metals.64 Suggested PWHT Temperature Ranges.8List of FiguresFigure Page No.1 ASME B31.1 and B31.3 Bandwidth Requirement for Local PWHT 911. ScopeThese recommended practices apply to the arc weld-ing of the

34、 following base-metal combinations:(1) Similar chromium-molybdenum steels(2) Dissimilar chromium-molybdenum steels(3) Chromium-molybdenum to austenitic chromium-nickel stainless steels(4) Chromium-molybdenum to either carbon or carbon-molybdenum steelsIn this document, the chromium-molybdenum steel

35、al-loys are referred to as Cr-Mo steels.Cr-Mo steels are used extensively in the power, chem-ical, and petroleum industries. The properties of such piping and tubing materials and the applicable fabrica-tion and inspection requirements are addressed in a wide range of documents, including:(1) ASTM M

36、aterial Specifications(2) ASME Codes for Pressure Piping, B31(a) Power Piping (ANSI/ASME B31.1)(b) Chemical Plant and Petroleum Refinery Pip-ing (ANSI/ASME B31.3)(3) ASME Boiler and Pressure Vessel Codes (Sec-tions I, IIA, IIC, VIII, and IX)(4) NBIC National Board Inspection Code for Boilers and Pre

37、ssure Vessels (ANSI/NB-23)(5) API Piping Inspection Code (Inspection, Repair, Alteration and Rerating of In-Service Piping Systems), (API 570).2. Base Metals2.1 General. Table 1 lists the types of steel considered and the nominal chemical compositions and abbrevia-tions by which they will be identif

38、ied in this document. If materials not listed in Table 1 are used, the contents of this document may not apply. This will be especially true if the hardenability is increased by the presence of a higher carbon content. The carbon content of the materi-als listed is usually below 0.15 percent.The pri

39、mary factors governing the choice of filler metals are the composition of the base metals to be joined and the service conditions of the system. Gener-ally, the filler metal composition and the mechanical properties of the deposited weld metal should match Table 1Base Metal AbbreviationsTypes of Ste

40、elNominal CompositionASME/ASTM/ Grade* AbbreviationCarbon Steel (less than 0.35% C) A, B, or C C-steelCarbon1/2% Mo P1 or T1 C-Mo1/2% Cr1/2% Mo P2 or T2 1/2 Cr-Mo1% Cr1/2% Mo P12 or T12 1 Cr-Mo1-1/4% Cr1/2% Mo P11 or T11 1-1/4 Cr-Mo2% Cr1/2% Mo T3b 2 Cr-Mo2-1/4% Cr1% Mo P22 or T22 2-1/4 Cr-Mo3% Cr1%

41、 Mo P21 or T21 3 Cr-Mo5% Cr1/2% Mo P5 or T5 5 Cr-Mo7% Cr1/2% Mo P7 or T7 7 Cr-Mo9% Cr1% Mo P9 or T9 9 Cr-Mo9% Cr1% Mo-V, Nb, and N P91 or T91 9Cr-Mo-V18% Cr8% Ni TP-304 304 S. S.18% Cr12% Ni-Mo TP-316 316 S. S.18% Cr10% Ni-Nb (Cb) TP-347 347 S. S.18% Cr10% Ni-Ti TP-321 321 S. S.25% Cr20% Ni TP-310 3

42、10 S. S.*Table uses Symbols P (pipe), T (tube), and TP (tube or pipe). Other product forms with same nominal chemistry for which this document applies are CP (cast pipe), F (forging), FP (forged pipe), and WP (welded pipe).Recommended Practices for Welding ofChromium-Molybdenum Steel Piping and Tubi

43、ng2those of the base metals as closely as possible. Where service includes corrosion or oxidation, the corrosion and oxidation characteristics of the base metals and the weld deposit should be either matched as closely as pos-sible or selected to minimize galvanic reaction.2.2 Base-Metal Addition. S

44、ince the last edition of this recommended practice, one new Cr-Mo alloy has been added. It has a nominal composition of 9% Cr and 1% Mo, but vanadium, niobium (columbium), and nitrogen have been added to improve mechanical properties and corrosion resistance at elevated temperatures. This new materi

45、al has been assigned the grade designation of P91 and T91. Its weldability is similar to that of conventional 9 Cr-Mo materials. Special filler metals have been devel-oped for some welding processes.3. Filler Metals3.1 General. Suggested filler metals for various base-metal combinations are shown in

46、 Table 2. The filler met-als in this table are listed in accordance with the AWS classifications for electrodes and rods for the shielded metal arc welding (SMAW), gas tungsten arc welding (GTAW), gas metal arc welding (GMAW), and flux cored arc welding (FCAW) processes. The classifications of fille

47、r metals for other processes will be in accordance with the specifications for those specific processes.Until recently the 5, 7, and 9 Cr-Mo electrodes and filler metals had been included in the same AWS filler metal specifications as austenitic stainless steels and had been assigned classifications

48、 such as E502. Recognizing that these filler metals are basically low-alloy steels, their classifications have been transferred to AWSs low-alloy filler metal specifications and have been assigned classifications such as E8018-B6. During these transition years, welding procedures and filler metal in

49、ventories can be expected to use both classifications. For the convenience of the user, Table 2 of this document lists these electrodes with their respective old and new classifications.Cr-Mo piping systems are usually selected for corro-sion resistance, high-temperature creep strength, or both. Since corrosion resistance is often associated with maxi-mum hardness, low-carbon electrodes (e.g., E8018-B3L), which are less air hardenable, are frequently se-lected for such applications. However, if high-tempera-ture creep resistance is a major design consideration, mini

copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
备案/许可证编号:苏ICP备17064731号-1