1、Specification for Carbon Manganese Steel Plate for Offshore StructuresAPI SPECIFICATION 2HNINTH EDITION, JULY 2006EFFECTIVE DATE: FEBRUARY 1, 2007REAFFIRMED, JANUARY 2012Specification for Carbon Manganese Steel Plate for Offshore StructuresUpstream SegmentAPI SPECIFICATION 2HNINTH EDITION, JULY 2006
2、EFFECTIVE DATE: FEBRUARY 1, 2007REAFFIRMED, JANUARY 2012SPECIAL NOTESAPI publications necessarily address problems of a general nature. With respect to particular circumstances, local, state, and federal laws and regulations should be reviewed.Neither API nor any of APIs employees, subcontractors, c
3、onsultants, committees, or other assignees make any warranty or representation, either express or implied, with respect to the accuracy, completeness, or usefulness of the information contained herein, or assume any liability or responsibility for any use, or the results of such use, of any informat
4、ion or process disclosed in this publication. Neither API nor any of APIs employees, subcontractors, con-sultants, or other assignees represent that use of this publication would not infringe upon pri-vately owned rights.Users of this Specification should not rely exclusively on the information cont
5、ained in this document. Sound business, scientific, engineering, and safety judgment should be used in employing the information contained herein.API publications may be used by anyone desiring to do so. Every effort has been made by the Institute to assure the accuracy and reliability of the data c
6、ontained in them; however, the Institute makes no representation, warranty, or guarantee in connection with this publication and hereby expressly disclaims any liability or responsibility for loss or damage resulting from its use or for the violation of any authorities having jurisdiction with which
7、 this publi-cation may conflict.API publications are published to facilitate the broad availability of proven, sound engineer-ing and operating practices. These publications are not intended to obviate the need for applying sound engineering judgment regarding when and where these publications shoul
8、d be utilized. The formulation and publication of API publications is not intended in any way to inhibit anyone from using any other practices.Any manufacturer marking equipment or materials in conformance with the marking requirements of an API standard is solely responsible for complying with all
9、the applicable requirements of that standard. API does not represent, warrant, or guarantee that such prod-ucts do in fact conform to the applicable API standard.All rights reserved. No part of this work may be reproduced, stored in a retrieval system, or transmitted by any means, electronic, mechan
10、ical, photocopying, recording, or otherwise, without prior written permission from the publisher. Contact the Publisher, API Publishing Services, 1220 L Street, N.W., Washington, D.C. 20005.Copyright 2006 American Petroleum InstituteFOREWORDThis specification is under the jurisdiction of the API Com
11、mittee on Standardization of Off-shore Structures.The purpose of this specification is to provide standards for the purchase of interchangeable steel plate suitable for use in selected welded tubular joints on offshore platforms.Nothing in this specification should be interpreted as indicating a pre
12、ference for any material or process. In the selection of materials and processes, the purchaser must be guided by this experience and by the service for which the plate is intended.The following definitions apply:Shall: As used in a standard, “shall” denotes a minimum requirement in order to conform
13、 to the specification. Should: As used in a standard, “should” denotes a recommendation or that which is advised but not required in order to conform to the specification. Nothing contained in any API publication is to be construed as granting any right, by impli-cation or otherwise, for the manufac
14、ture, sale, or use of any method, apparatus, or product covered by letters patent. Neither should anything contained in the publication be construed as insuring anyone against liability for infringement of letters patent.This document was produced under API standardization procedures that ensure app
15、ropriate notification and participation in the developmental process and is designated as an API stan-dard. Questions concerning the interpretation of the content of this publication or comments and questions concerning the procedures under which this publication was developed should be directed in
16、writing to the Director of Standards, American Petroleum Institute, 1220 L Street, N.W., Washington, D.C. 20005. Requests for permission to reproduce or translate all or any part of the material published herein should also be addressed to the director.Generally, API standards are reviewed and revis
17、ed, reaffirmed, or withdrawn at least every five years. A one-time extension of up to two years may be added to this review cycle. Status of the publication can be ascertained from the API Standards Department, telephone (202) 682-8000. A catalog of API publications and materials is published annual
18、ly and updated quarterly by API, 1220 L Street, N.W., Washington, D.C. 20005.Suggested revisions are invited and should be submitted to the Standards and Publications Department, API, 1220 L Street, NW, Washington, DC 20005, standardsapi.org.iiiCONTENTSPage1 SCOPE . . . . . . . . . . . . . . . . . .
19、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 GENERAL REQUIREMENTS FOR DELIVERY . . . . . . . . . . . . . . . . . . . . . .
20、. . . . . . .24 MANUFACTURING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 CHEMICAL REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 MECHANICAL REQUIREMENTS . . . . . . . . . . . . . . .
21、. . . . . . . . . . . . . . . . . . . . . . . . .37 NOTCH TOUGHNESS REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38 MARKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4APPENDIX A SUPPLEMENT
22、ARY REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . .5APPENDIX B SUGGESTIONS FOR ORDERING API 2H STEEL PLATE 9APPENDIX C API MONOGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Tables: 1Chemical Requirements . . . . . . . . . . . . . . . . . . .
23、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Tensile Requirements(transverse tests) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Notch Toughness Requirements Charpy V-Notch Testing . . . . . . . . . . . . . . . . . . . . . .4S2-1Notch Toughness Requirement
24、s at Lower Temperatures Drop-Weight TestingNo-Break at 67F (55C) Or Charpy Impact Testing . . . . . . . . . . . . . . . . . . . . . .5v1Specification for Carbon Manganese Steel Plate for Offshore Structures1 Scope1.1 This specification covers two grades of intermediate strength steel plates up to 4
25、in. thick for use in welded construction of offshore structures, in selected critical portions which must resist impact, plastic fatigue loading, and lamellar tearing. These steels are intended for fabrication primarily by cold forming and welding as per API Spec 2B. The welding procedure is of fund
26、a-mental importance and it is presumed that procedures will be suitable for the steels and their intended service. Conversely, the steels should be amenable to fabrication and welding under shipyard and offshore conditions. API Specifications 2W and 2Y cover companion steels providing similar mechan
27、ical properties but with the advantage of potentially lower preheats, and the availability of API RP 2Z prequalification of HAZ toughness. This improvement results from a reduction in the maximum allowed chemical composition and is made possible by changes in the method of heat treatment and/or proc
28、essing.1.2 The primary use of these steels is in tubular joints, stiffened plate construction, and other intersections where portions of the plates will be subjected to tension in the thickness direction (Z-direction). Supplementary Requirement S4 provides for through-thickness (Z-direction) testing
29、 of the plates by the material manufacturer and specified limits for acceptance. Supplementary Requirement S1 provides for ultrasonic examination of the plates by the material manufacturer and specifies limits for accep-tance. For applications where through-thickness properties are desirable but the
30、 expense of extra testing is not considered neces-sary, Supplementary Requirement S5 provides a low-sulfur chemistry intended to reduce the size and number of sulfide inclusions in the plate. Supplementary requirement S5 is neither a substitute for S4 Through-Thickness Testing nor a guarantee of a m
31、inimum level of through-thickness ductility. Experience indicates, however, that tests of low-sulfur carbon-manganese steels would usually show at least 20% reduction-of-area in a Z-direction tension test. Even without S5, API Spec 2H provides a reduced sulfur level, compared to other common structu
32、ral steels. 1.3 The notch toughness requirements specified in Section 7 or S12 are suitable for application below water or above water in areas of temperate climate 14F (10C) minimum service temperature. Cold-formed materials have less toughness due to straining than that of the original flat plate,
33、 especially in those areas aged by the attachment welding of stubs or braces. The requirements for plates in Section 7 include a moderate adjustment for losses in toughness due to straining and aging; however, differences in composition or fabrication practices may result in significantly greater de
34、gradation than that included. Supplemen-tary Requirements S7 and S8 deal with the strain-aging problem, and consideration should be given to invoking S7 and/or S8 when the strain exceeds 5% or when (Nitrogen x % strain) exceeds 0.040. Supplementary Requirement S8 provides for testing at the specific
35、 temperatures and strain levels of interest and is recommended for all material purchases which exceed the purchasers experience base.For applications with lower service temperatures, lower test temperatures should be considered. Supplementary Requirement S2 provides for impact tests at temperatures
36、 other than those specified in Section 6 or S12. S2.1 provides for Drop Weight or Charpy V-notch testing at 76F (60C). S2.2 provides for such testing at temperatures less than 40F (40C) but other than 76F (60C).2 ReferencesThe standards referenced herein are as follows:APISpec 2B Fabrication of Stru
37、ctural Steel PipeASTM1A6/A6M Standard Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet PilingA20/A20M Standard Specification for General Requirements for Steel Plates for Pressure VesselsA370 Standard Test Methods and Definitions for Mechanical Testi
38、ng of Steel ProductsA578/578M Standard Specification for Straight-Beam Ultrasonic Examination of Plain and Clad Steel Plates for Special Applications1ASTM International, 100 Bar Harbor Drive, West Conshohocken, Pennsylvania 19428, www.astm.org2 API SPECIFICATION 2HE23 Standard Test Methods for Notch
39、ed Bar Impact Testing of Metallic Materials E208 Standard Test Method for Conducting Drop-Weight Test for Nil-Ductility Transition Temperature of Ferritic Steels3 General Requirements for Delivery3.1 Material furnished to this specification shall conform to ASTM A6/A6M and shall be marked as specifi
40、ed in Section 8. In the event of conflict, this specification shall prevail.3.2 Visual examination for defects shall be performed on all surfaces.4 Manufacturing4.1 All plates shall be normalized, except as otherwise permitted in 4.2, by the material manufacturer. Alternately, the fabricator may nor
41、malize the material using procedures established by the manufacturer on test coupons in accordance with ASTM A6/A6M.4.2 If approved by the purchaser, Grade 50 plates over 21/2 in. in nominal thickness, may be quenched-and-tempered by heating to a temperature between 1500F (815C) and 1700F (925C) to
42、produce an austenitic structure, holding a sufficient time to attain uniform heat throughout the material, quenching in a suitable medium, and tempering in the range from 1100F to 1300F (595C to 705C).5 Chemical Requirements5.1 The steel shall conform to the requirements for chemical composition as
43、prescribed in Table 1, and to the additional require-ments of the following subsections.Table 1Chemical RequirementsRequirement, Wt. % Requirement, Wt. %Element Grade 42 Grade 50 Element Grade 42 Grade 50Carbon, max ColombiumHeat analysis 0.18 0.18 Heat analysis 0.04 max 0.01 0.04Product analysis 0.
44、22 0.22Manganese Titanium 0.020 maxb0.020 maxbHeat analysis 0.90 1.35a1.15 1.60 Aluminum, totalHeat analysis 0.02 0.06 0.02 0.06Phosphorus, maxHeat analysis 0.030 0.030 Nitrogen, maxHeat analysis 0.012c0.012cSulfur, maxHeat analysis 0.010 0.010 Vanadiumd dProduct analysis 0.015 0.015SiliconHeat anal
45、ysis 0.05 0.40 0.05 0.40Product analysis 0.05 0.45 0.05 0.45Notes: aManganese up to 1.60 on heat analysis is permitted at the option of the material manufacturer. bMinimum values, if any, shall be as agreed upon and stated on the order. cShall not be intentionally added. dShall not be intentionally
46、added without the specific approval of the purchaser, in which case the limiting values for heat and product analyses shall be agreed upon and stated on the order.SPECIFICATION FOR CARBON MANGANESE STEEL PLATE FOR OFFSHORE STRUCTURES 35.2 Carbon Equivalent (CE). The Carbon Equivalent (CE) of the hea
47、t analysis shall be calculated and reported. The CE shall be determined by the following formula:CE CMn6-Cr Mo V+()5-Ni Cu+()15-+ +=The maximum CE shall be as follows: Grade Thickness CE Max42 to 21/2 in. 0.43over 21/2 in. 0.4550 to 2 in. 0.43over 2 in. 0.455.3 Any element intentionally added and al
48、l elements in the CE formula shall be reported.5.4 Boron, vanadium, and zirconium, as well as cerium and other rare earth metals shall not be intentionally added without the specific approval of the purchaser.5.5 If any of the elements listed in 5.4 are added, the plate must be given additional mark
49、ing per 8.1.d.6 Mechanical RequirementsThe material, as represented by transverse test specimens, shall conform to the tensile requirements given in Table 2.Table Property Grade 42 Grade 50Yield Strengthksi (MPa), min.t 2.5 in. 42 (289) 47 (324)Tensile strengthksi (MPa) 6282 (427565) 7090 (483620)Elongation, %, min.in 2 in. (50 mm) 22 21in 8 in. (200 mm) 18 162Tensile Requirements(transverse tests)7 Notch Toughness Requirements7.1 Impact tests shall be Charpy V-notch
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