1、Specification for Carbon Manganese Steel Plate with Improved Toughness for OffshoreStructuresAPI SPECIFICATION 2MT1 (SPEC 2MT1)SECOND EDITION, SEPTEMBER 2001EFFECTIVE DATE: MARCH 2002REAFFIRMED, JANUARY 2012Specification for Carbon Manganese Steel Plate with Improved Toughness for OffshoreStructures
2、Upstream SegmentAPI SPECIFICATION 2MT1 (SPEC 2MT1)SECOND EDITION, SEPTEMBER 2001EFFECTIVE DATE: MARCH 2002REAFFIRMED, JANUARY 2012SPECIAL NOTESAPI publications necessarily address problems of a general nature. With respect to partic-ular circumstances, local, state, and federal laws and regulations
3、should be reviewed.API is not undertaking to meet the duties of employers, manufacturers, or suppliers towarn and properly train and equip their employees, and others exposed, concerning healthand safety risks and precautions, nor undertaking their obligations under local, state, or fed-eral laws.In
4、formation concerning safety and health risks and proper precautions with respect to par-ticular materials and conditions should be obtained from the employer, the manufacturer orsupplier of that material, or the material safety data sheet.Nothing contained in any API publication is to be construed a
5、s granting any right, byimplication or otherwise, for the manufacture, sale, or use of any method, apparatus, or prod-uct covered by letters patent. Neither should anything contained in the publication be con-strued as insuring anyone against liability for infringement of letters patent.Generally, A
6、PI standards are reviewed and revised, reafrmed, or withdrawn at least everyve years. Sometimes a one-time extension of up to two years will be added to this reviewcycle. This publication will no longer be in effect ve years after its publication date as anoperative API standard or, where an extensi
7、on has been granted, upon republication. Statusof the publication can be ascertained from the API Upstream Segment telephone (202) 682-8000. A catalog of API publications and materials is published annually and updated quar-terly by API, 1220 L Street, N.W., Washington, D.C. 20005.This document was
8、produced under API standardization procedures that ensure appropri-ate notication and participation in the developmental process and is designated as an APIstandard. Questions concerning the interpretation of the content of this standard or com-ments and questions concerning the procedures under whi
9、ch this standard was developedshould be directed in writing to the standardization manager, American Petroleum Institute,1220 L Street, N.W., Washington, D.C. 20005. Requests for permission to reproduce ortranslate all or any part of the material published herein should also be addressed to the gen-
10、eral manager.API standards are published to facilitate the broad availability of proven, sound engineer-ing and operating practices. These standards are not intended to obviate the need for apply-ing sound engineering judgment regarding when and where these standards should beutilized. The formulati
11、on and publication of API standards is not intended in any way toinhibit anyone from using any other practices.Any manufacturer marking equipment or materials in conformance with the markingrequirements of an API standard is solely responsible for complying with all the applicablerequirements of tha
12、t 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, mechanical, photocopying, recording, or
13、otherwise, without prior written permission from the publisher. Contact the Publisher, API Publishing Services, 1220 L Street, N.W., Washington, D.C. 20005.Copyright 2001 American Petroleum InstituteFOREWORDThis specication is under the jurisdiction of the API Subcommittee on Standardization ofOffsh
14、ore Structures.The purpose of this specication is to provide standards for the purchase of as rolled steelplate with improved toughness suitable for use in selected applications on offshore plat-forms. This standard shall become effective on the date printed on the cover but may be used vol-untarily
15、 from the date of distribution.API publications may be used by anyone desiring to do so. Every effort has been made bythe Institute to assure the accuracy and reliability of the data contained in them; however, theInstitute makes no representation, warranty, or guarantee in connection with this publ
16、icationand hereby expressly disclaims any liability or responsibility for loss or damage resultingfrom its use or for the violation of any federal, state, or municipal regulation with which thispublication may conict.Suggested revisions are invited and should be submitted to the standardization mana
17、ger,American Petroleum Institute, 1220 L Street, N.W., Washington, D.C. 20005.iiiCONTENTSPage1 SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.1 Coverage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18、 . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.2 Primary Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19、. 13 GENERAL REQUIREMENTS FOR DELIVERY . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.1 Applicable Reference Specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2 Visual Examination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
20、 . . . . . . . . . . . . 13.3 Mill Test Certicates. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 MANUFACTURING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.1 Delivery Conditions . . . . .
21、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.2 Plate Retreatment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.3 Manufacturing Procedure Specication. . . . . . . . . . . . . . . . . . . . . . . . . .
22、 . . . . . . . 15 CHEMICAL REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.1 Chemical Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.2 Carbon Equivalent . . . . . . . . . . . . . . . . . . .
23、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.3 Reporting Additional Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.4 Restricted Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.5
24、Additional Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 MECHANICAL REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26.1 Tensile Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . .
25、. . . . . . . . . . . . . . . . . . . . 26.2 Test Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26.3 Retesting Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26.4 Heat Req
26、ualication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36.5 Retesting of Rejected Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36.6 Retreatment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27、 . . . . . . . . . . . . . . . . . . . . . . . . 37 NOTCH TOUGHNESS REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.1 Charpy V-notch Impact Tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.2 Retest Conditions. . . . . . . . .
28、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.3 Heat Requalication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.4 Retesting of Rejected Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
29、 . . . . . . . 37.5 Retreatment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 MARKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38.1 Plate Marking. . . . . . .
30、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Tables1 Chemical Requirements, Heat Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Tensile Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
31、 . . . . . . . . . . . . . 23 Notch Toughness Requirements Charpy V-Notch Testing . . . . . . . . . . . . . . . . . . . . 3APPENDIX A SUGGESTIONS FOR ORDERING API 2MT1 STEEL PLATE . . . . . . 5v1Specification for Carbon Manganese Steel Plate with Improved Toughness for Offshore Structures1 Scope1.1
32、COVERAGEThis specication covers one grade of intermediatestrength steel plates, though 21/2in. thick, for use in weldedconstruction of offshore structures. These steels are intendedfor fabrication primarily by cold forming and welding as perAPI Spec 2B. The welding procedure is of fundamentalimporta
33、nce, and it is presumed that procedures will be suit-able for the steels and their intended service. Conversely, thesteel should be amendable to fabrication and welding undershipyard and offshore conditions. These steels are suitable foruse in selected portions of offshore structures, which mustresi
34、st impact and plastic fatigue loading. When hot or warmforming or PWHT above 1100F is anticipated for acceler-ated cooling (AC) or quenched and tempered (QC) plates, S9should be invoked, (italics added per ASTM A913).1.2 PRIMARY APPLICATIONThe primary use of these steels is for Class B applica-tions
35、 as dened in API RP 2A. API Specs 2H, 2W, and 2Ycover other steels providing improved mechanical propertiesand toughness for Class A applications and should be usedwhere substantial z-direction stresses are expected.2 ReferencesThe applicable editions of standards referenced herein areas follows:API
36、Spec 2B Fabrication of Structural Steel PipeASTM1A6/A6M01 Standard Specication for GeneralRequirements for Rolled Structural SteelBars, Plates, Shapes and Sheet PilingA37097a Standard Test Methods and Denitions forMechanical Testing of Steel ProductsA578/Standard Specication for Straight-BeamA578M96
37、Ultrasonic Examination of Plain and Clad Steel Plates for Special ApplicationsA673/Standard Specication for Sampling Pro-A673M95cedure for Impact Testing of StructuralSteelE2300 Standard Test Method for Notched BarImpact Testing of Metallic Materials3 General Requirements for Delivery3.1 APPLICABLE
38、REFERENCE SPECIFICATIONSMaterial furnished to this specication shall conform toASTM A6/A6M01 and shall be marked as specied in Sec-tion 8 of this specication. If a conict occurs between ASTM A6 and API Spec2MT1, API Spec 2MT1 shall take precedence.3.2 VISUAL EXAMINATIONVisual examination for defects
39、 shall be performed on allsurfaces (ASTM A6/A6M01 Section 9).3.3 MILL TEST CERTIFICATESMill test certicates are requires for all API Spec 2MT1steel plate. See paragraphs 5.2, 5.3, 5.4, 6.1 and 7.1.4 Manufacturing4.1 DELIVERY CONDITIONSAll plates shall be delivered in the as-rolled (hot rolled orcont
40、rolled rolled), TMCP, normalized, or quenched and tem-pered condition except as noted in 4.2 below.4.2 PLATE RETREATMENTPlates that fail to meet the minimum specied mechanicalrequirements in the as-rolled condition may be heat treatedeither by normalizing or quenching and tempering treat-ments. For
41、quenched and tempered treatment, the plate shallbe heated to a temperature between 1550F (845C) and1700F (925C) to produce an austenitic structure, held a suf-cient time to obtain uniform structure throughout, quenchedin a suitable medium, then tempered in the range of 1050F to1250F (565C to 675C) f
42、or a suitable time to obtain thespecied mechanical properties.4.3 MANUFACTURING PROCEDURE SPECIFICATIONThe manufacturer shall provide the purchaser with theproposed manufacturing approach (i.e., thermal treat-ment), and, when requested, with the Manufacturing Pro-cedure Specication (MPS). If additio
43、nal detail for MPS isrequired, see S-15.1ASTM, 100 Barr Harbor Drive, West Conshohocken, Pennsylvania19428.2 API SPECIFICATION2MT15 Chemical Requirements5.1 CHEMICAL COMPOSITIONThe steel shall conform to the requirements for chemicalcomposition as prescribed in Table 1 and to the additionalrequireme
44、nts of 5.2.5.2 CARBON EQUIVALENT5.2.1The Carbon Equivalent (CEIIW) and Pcmshall be cal-culated and reported based on heat analysis. The CEIIWshallbe determined by the following formula:CEIIW= C+ Mn/6 + (Cr+ Mo+ V)/5 + (Ni+ Cu)/15The Pcmshall be determined by the following formula:5.2.2The maximum CE
45、IIWand Pcmshall be as follows:Lower CEIIWor Pcmmay be specied by agreementbetween purchaser and manufacturer.5.3 REPORTING ADDITIONAL ELEMENTSAny element intentionally added and all elements in theCEIIWand Pcm formulas shall be reported.5.4 RESTRICTED ELEMENTSBoron, zirconium, cerium and other rare
46、earth metals shallnot be intentionally added without the specic approval of thepurchaser.5.5 ADDITIONAL MARKINGIf any of the elements listed in 5.4 are added, the platemust be given additional markings, per Section 8.1.d.6 Mechanical Requirements6.1 TENSILE REQUIREMENTSThe material, as represented b
47、y the test specimens, shallconform to the tensile requirements given in Table 2. Testingshall be according to ASTM A370.6.2 TEST FREQUENCYTensile testing frequency shall be dened in paragraph11.4 of ASTM A6.6.3 RETESTING OPTIONSIf one of more of the initial tension tests fail to meet theretest condi
48、tions as shown in ASTM A6 paragraph 15 or pur-chase order requirements, all plates of the same thickness asthe original failed test are considered rejected and all platesfrom the heat are rejected except as may be requalied by 6.4. Table 1Chemical Requirements, Heat AnalysisElementREQUIREMENT,WT.%Gr
49、ade 2MT1 ElementREQUIREMENT,WT. %Grade 2MT1Carbon, max.Manganese Phosphorous, max.Sulfur, max.SiliconNiobium0.121.15 1.600.0300.0100.10 0.400.010 0.040Titanium, max.Aluminum, totaleAluminum, solubleeNitrogen, max.Vanadium, max.ZirconiumcBoron, max.Cerium, max.d0.020a0.020 0.0600.015 0.0550.012b0.080a0.0005b0.010a Minimum values, if any, shall be as agreed upon and states on the order.b Shall not be intentionally added.cShall not be intentionally added without the specic approval of the purchaser, in which case the limiting valu
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