1、Specification for Steel Plates, Quenched-and-Tempered, for Offshore StructuresAPI SPECIFICATION 2YFIFTH EDITION, DECEMBER 2006EFFECTIVE DATE: JUNE 1, 2007REAFFIRMED, JANUARY 2012Specification for Steel Plates, Quenched-and-Tempered, for Offshore StructuresUpstream SegmentAPI SPECIFICATION 2YFIFTH ED
2、ITION, DECEMBER 2006EFFECTIVE DATE: JUNE 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, s
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10、ican Petroleum InstituteFOREWORDThis specification is under the jurisdiction of the API Subcommittee on Standardization of Offshore Structures.The purpose of this specification is to provide standards for the purchase of quenched-and-tempered steel plate suitable for use in welded offshore structure
11、s.Nothing in this specification should be interpreted as indicating a preference by the commit-tee for any material or process. In the selection of materials and processes, the purchaser must be guided by his experience and by the service for which the plate is intended.Changes from the previous edi
12、tion are noted by bars in the margins.Shall: As used in a standard, “shall” denotes a minimum requirement in order to conform 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.Sugge
13、sted revisions are invited and should be submitted to the Standards and Publications Department, API, 1220 L Street, NW, Washington, DC 20005, standardsapi.org.iiiv CONTENTS 1 SCOPE. 1 1.1 Coverage 1 1.2 Post Manufacturing Heating . 1 1.3 Preproduction Qualification 2 2 REFERENCED DOCUMENTS 2 3 GENE
14、RAL REQUIREMENTS FOR DELIVERY. 2 4 MANUFACTURING . 3 4.1 Melting. 3 4.2 Heat Treatment 3 5 CHEMICAL REQUIREMENTS . 3 6 MECHANICAL REQUIREMENTS . 5 7 NOTCH TOUGHNESS REQUIREMENTS . 5 8 MARKING 6 APPENDIX A SUPPLEMENTARY REQUIREMENTS. 7 APPENDIX B SUGGESTIONS FOR ORDERING API 2Y SPEC STEEL PLATE 11 AP
15、PENDIX C API MONOGRAM 13 Tables 1 Chemical Requirements 4 2 Carbon Equivalent Maximums. 4 3 Tensile Requirements 5 4 Notch Toughness Requirements Charpy V-Notch Testing . 5 S2-1 Notch Toughness Requirements at Lower Temperatures Drop-Weight Testing S2-1 No-Break at 67F (55C) or Charpy Impact Testing
16、 . 8 1 Specification for Steel Plates, Quenched-and-Tempered, for Offshore Structures 1 Scope 1.1 COVERAGE This specification covers two grades of high strength steel plate for use in welded construction of offshore structures, in selected critical portions which must resist impact, plastic fatigue
17、loading, and lamellar tearing. Grade 50 is covered in thicknesses up to 6 in. (150 mm) inclusive, and Grade 60 is covered in thicknesses up to 4 in. (100 mm) inclusive. 1.1.1 It is intended that steel produced to Grade 50 of the basic API Spec 2Y, without Supplementary Requirements, be at least equi
18、valent in minimum performance and, therefore, in service application, to the corresponding grades listed in Sections 5 through 7 of API Spec 2H and API Spec 2W. 1.1.2 API Spec 2Y steels are intended for fabrication primarily by cold-forming and welding. The welding procedure is of fundamental import
19、ance and it is presumed that procedures will be suitable for the steels and their intended service. Because of the characteristic high YS/TS ratio of quenched-and-tempered steels, users may want to consider welding consumables which avoid undermatched weld metal. Conversely, the steels should be ame
20、nable to fabrication and welding under shipyard and offshore conditions. 1.2 POST MANUFACTURING HEATING 1.2.1 Due to the inherent characteristics of quenched-and-tempered material, plates manufactured to this Specification cannot be formed or postweld heat treated at temperatures above the tempering
21、 temperature used during manufacture without some risk of sustaining irreversible and significant losses in strength and toughness. If warm-forming is to be required, the tensile and notch toughness properties of the finished component shall be verified and the properties shall conform to the requir
22、ements of the specification. The plates may be post-weld heat treated at a temperature higher than that used during manufacture, providing the test coupons are subjected to a thermal cycle to simulate such fabrication operations, as described in Supplementary Requirement S9. Verification or simulati
23、on is not necessary for heating at temperatures not exceeding 400F (205C). 1.2.2 The primary use of these steels is in tubular joints, stiffened plate construction, and other intersections where portions of the plates will be subject to tension in the thickness direction (Z-direction). Supplementary
24、 Requirement S4 provides for through-thickness (Z-direction) testing of the plates by the manufacturer and specifies limits for acceptance. Supplementary Requirement S1 provides for ultrasonic examination of the plates by the manufacturer and specifies limits for acceptance. 1.2.3 For applications w
25、here through-thickness properties are important but Z-direction testing has not been specified, 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 Supplementa
26、ry Requirement S4, Through Thickness Testing, nor a guarantee of a minimum level of through-thickness ductility. 1.2.4 The notch toughness requirements specified in Section 7 are suitable for application below water, or above water in areas of temperate climate (14F 10C minimum service temperature).
27、 Cold-formed materials have less toughness due to straining than that of the original flat plates, especially in those areas aged by the attachment welding of stubs and braces. The requirements for plates in Section 7 take into consideration typical losses in toughness due to straining and aging. Su
28、pplementary Requirements S7 and S8 deal with the strain-aging problem, and consideration should be given to invoking Supplementary Requirement S7 and/or S8 when the strain exceeds 5% or when (Nitrogen % strain) exceeds 0.040. 2 API SPECIFICATION 2Y 1.2.4.1 For application with lower service temperat
29、ures, lower test temperatures should be considered. Supplementary Requirement S2 provides for impact tests at temperatures other than specified in Section 7 or Supplementary Requirement S12. Supplementary Requirement S2.1 provides for Drop-Weight or Charpy V-notch testing at 60C. Supplementary Requi
30、rement S2.2 provides for such testing at temperatures less than 40C but other than 60C. 1.3 PREPRODUCTION QUALIFICATION Supplementary Requirement S11 and Section 3 of API RP 2Z, dealing with CTOD testing of the weld heat-affected zone and with resistance to hydrogen cracking, respectively, address p
31、roblems which are not normally dealt with in a “commodity grade” steel specification. These problems are not unique to Q the Controlled Thermal Severity (CTS) test for moderate restraint, and the V-Groove test for high restraint. S12 Notch Toughness Using Drop-Weight Testing S12.1 Drop-Weight tests
32、shall be conducted. One plate per 50 ton lot or part thereof of the plates in each heat 5/8inch (16 mm) or more in thickness shall be tested. The plate tested shall be the thickest gage in each 50 ton (45t) lot. S12.2 Drop-Weight tests shall be in accordance with ASTM E 208 on two P-3 specimens from
33、 the selected plate(s). The specimens shall be taken adjacent to the tensile test coupons and tested at 30F (35C). Both specimens shall meet the “no break” criteria at the test temperature, and the results shall be reported. S12.3 If one specimen fails (“Breaks”) on any plate tested, retests may be
34、made as follows: a. Retest two additional specimens from each plate for which a specimen failed. Each of these two retest specimens must pass (“No Break”). b. If any of the specimens fail upon retest the heat shall not be accepted without reheat treatment and repeating the tensile, Charpy V-notch im
35、pact, and drop weight tests. S13 Surface Quality For applications where surface quality is considered critical, plates are to be furnished in the blasted and inspected conditions. The depth of rolled-in scale or clusters of pits shall not exceed 0.015 in. (0.381 mm) and shall not result in an underg
36、age condition. However, isolated individual pits not over 0.030 in. (0.762 mm) deep are acceptable provided plate thickness is not reduced below the specified minimum. Other surface imperfections such as tears, seams, snakes, blisters, scabs, etc. are not acceptable and must be conditioned without r
37、educing the thickness below minimum. The surface imperfections may be removed by grinding provided each ground area is well faired and grinding does not reduce the thickness of the plate below minimum. S14 Thickness Tolerance By agreement between purchaser and supplier, plates can be ordered to 1/2s
38、tandard over tolerance for thickness shown in ASTM A 6/A 6M. 11 APPENDIX BSUGGESTIONS FOR ORDERING API SPEC 2Y STEEL PLATE In placing orders for steel plate to be manufactured in accordance with API Spec 2Y, the purchaser should specify the following on the purchase order: Specification API Spec 2Y
39、Quantity Size As Required Grade 50 or 60 Mill Inspection by Purchaser State Advance Notice Requirements Delivery Date and Shipping Instructions As Required Supplementary Requirements As Required The purchaser should state on the purchase order his requirements concerning the following Supplementary
40、Requirements, which are optional with the purchaser. Note: Section 1 of this specification addresses the purpose/function of several of the supplementary requirements. S1 Ultrasonic Examination null S2 Notch Toughness at Lower Temperatures nullS2.1 Notch Toughness at 60C null S2.2 Notch Toughness at
41、 Other Than 40C or 60C null S2.3 Higher Notch Toughness Energy Values null S3 Additional Tension Test null S4 Through-Thickness (Z-Direction) Testing null S5 Low Sulfur Steel for Improved Through-Thickness Properties null S7 Low Nitrogen Content for Improved Notch Toughness in null Strain-Aged Condi
42、tion S8 Strain-Aged Charpy V-Notch Impact Tests null S9 Simulated Post-Weld Heat Treatment null S10 Hardness Testing null S11 Preproduction Qualification null S11.3 CTOD testing of weld heat affected zone null S11.4 Weldability (Hydrogen Cracking) Tests at null CP (Conventional Preheat) Level of Per
43、formance MP (Modified Preheat) Level of Performance null S12 Notch Toughness Using Drop Weight null S13 Surface Quality null S14 Thickness Tolerance null 13 APPENDIX CAPI MONOGRAM The API Monogram Program allows an API Licensee to apply the API Monogram to products. The use of the Monogram on produc
44、ts constitutes a representation and warranty by the Licensee to purchasers of the products that, on the date indicated, the products were produced in accordance with a verified quality management system and in accordance with an API product specification. The API Monogram Program delivers significan
45、t value to the international oil and gas industry by linking the verification of an organizations quality management system with the demonstrated ability to meet specific product specification requirements. When used in conjunction with the requirements of the API License Agreement, API Specificatio
46、n Q1 defines the requirements for those organizations who wish to voluntarily obtain an API License to provide API monogrammed products in accordance with an API product specification. API Monogram Program Licenses are issued only after an on-site audit has verified that the Licensee conforms to the
47、 requirements described in API Specification Q1 in total. For information on becoming an API Monogram Licensee, please contact API, Certification Programs, 1220 L Street, N. W., Washington, DC 20005 or call 202-682-8000 or by email at certificationapi.org. Invoice To ( Check here if same as “Ship To
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