SY/T 10004-1996 Specification for carbon manganese steel plates for offshore platform tubular joints
Some standard content:
Offshore Oil and Gas Industry Standard of the People's Republic of China SY/T 10004--1996
Specification for Carbon Mangancse Steel Platc for Offshore Platform Tubular Joints
Published on August 19, 1996
China National Offshore Oil Corporation
Implemented on August 19, 1996
Policy Statement
References
For Ordering API 2H Recommendations for steel plates
Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5Www.bzxZ.net
Chapter 6
Chapter 7
Appendix A
General requirements for delivery
Chemical or sub-requirements...
Mechanical property requirements
Notch toughness requirements
Supplementary requirements
..t.+..||tt| |----++.++.++-+++++++-+++-++++PaP++Ae++e+pee++eePe+e+e+-r+Pe++1+eP+++++eee.+eeP.-oeep+-e..+..e...(1)
In order to meet the needs of developing offshore oil and gas resources in my country, our company adopts the API SPEC 2H Specification for Carbon Manganese Steel Plate for Offshore Platform Tubular Joints\1990, the 1990 edition, as the recommended standard of China National Offshore Oil Corporation. If there is any objection to the translation of this standard, the original text of the adopted standard shall prevail. In the design, construction and use of offshore oil and gas development projects involving the laws, regulations and provisions of the government of the country where the original standard is located or other competent authorities, the relevant laws, regulations and provisions promulgated by the government of the People's Republic of China or the competent government departments shall be followed. The data or quantitative calculation methods of environmental conditions such as wind, waves, currents, ice, temperature, and ground in the original standard can be used as a reference if they are in line with my country's actual conditions. For measurement, the data and quantitative calculation methods that meet China's actual environmental conditions should be used. Regarding the measurement units, the legal measurement units are mainly used, that is, the legal measurement unit values are in front, and the corresponding values of the imperial units are marked in brackets afterwards. In order not to change the formulas, shape characteristics of curves, constants and coefficients in the original standard, all the imperial units are still used. China National Offshore Oil Corporation
China National Offshore Oil Standardization Technical Committee 1993.11.15
l. This specification is under the jurisdiction of the Offshore Structure Standardization Committee of the American Petroleum Institute 6. The purpose of this specification is to provide a standard for ordering general steel pipes used to build offshore platform pipe nodes. c. This standard takes effect from the date printed on the cover, but can be adopted on the date of distribution. d. Manufacturers who wish to obtain a license to use the API monogram should obtain application materials from the American Petroleum Institute's Dallas office (API Dallas Office at 2535 One Main Place, las, Texas 75020), or purchase a list of manufacturers authorized to use the AHI monogram, order number 811-000050.
User Notice: The main parts of this publication have been revised from the previous version, and the revised parts are marked with a bold black line on the left. Some of the revisions are substantial, while some revisions are editorial adjustments. The bold black line marks help users identify the parts of this publication that have been revised from the previous version, but API does not guarantee the accuracy of these bold black line marks. NOTE: This edition supersedes the fifth edition, dated July 1, 1988, which incorporates changes made by the 1989 standardization meeting of IRCPS 188 and subsequently approved by correspondence ballot.
Applications for permission to reprint or translate all or any part of this publication should be addressed to the Director, Development, American Petroleum Institute, 2535 One Main Place+, Dallas, TX 75202. Regulation.
Policy Statement
AP1 Publications address only matters of a general nature. Local, state, and federal laws and regulations should be consulted for specific issues. AP does not assume responsibility for employers, manufacturers, or suppliers regarding health and safety risks and preventive measures, special training, and equipment for their employees and other field personnel. Nor does it assume responsibility for their local, state, or federal legal obligations. Nothing in any API publication should be construed, by implication or otherwise, as granting any right to make, sell, or use any process, apparatus, or product covered by any patent. Nor should it be construed to absolve any person of liability for infringement of any patent. Normally, API standards are reviewed and revised, re-approved, or revoked at least five years. Occasionally, the review period may be extended once for a maximum of two years. This publication shall remain in effect for no more than five years from the date of publication as an API standard unless an extension of its validity period is authorized by republication. The status of this publication may be inquired from the API Editorial Office (telephone 214-748-3841). API (1200 L ST, NW, WASHINGTON, DC 20005) publishes a monthly catalog of publications and materials each year and updates it quarterly. The publication of various specifications of the American Petroleum Institute (API) helps to obtain standardized equipment and materials, and provides manufacturers with guidance for manufacturing equipment or materials in accordance with AFI specifications. These specifications are not intended to exclude the need for advanced technology, nor are they intended to prohibit anyone from purchasing or producing products that meet other specifications in any way.
AP[The preparation and publication of various specifications and the API monogram outline are not intended to prohibit in any way the purchase of products from companies that are not authorized to use the API monogram.
API specifications are available for use by anyone who is willing to implement the specifications. The Institute has made unremitting efforts to ensure that the data of this specification is Accuracy and reliability. However, the Institute makes no representations, warranties or guarantees regarding any published specifications. It is expressly stated that API assumes no obligation or responsibility for loss or damage resulting from the use of API specifications, conflicts with federal, state or municipal regulations, or infringement of patents resulting from the use of API specifications.
Manufacturers who mark equipment or materials in accordance with the marking requirements of API specifications shall be fully responsible for compliance of their products with all requirements of API specifications. The American Petroleum Institute does not represent, warrant or guarantee that these products actually comply with the selected API specifications. References
The standard versions referenced in this article are as follows:
APIStandards
API Spec 2B,Fourth Edition,July-,1989,Fabrication of Structural Steel Pipe.ASTMStandards:
A 6/A 6M-37d General Requirements for Rolled Steel Plates Shapes, Shect Piling, and Bars for Structural Use.
A20/A20-87General Requirements for Steel Pletes for PressureVessels. A 370-8Ga Mechanical Testing of Stcel Products,Test Methods and Definitions for. A 578/A 578M-85 Straight -Beam Ultrasonic Examination of Plain and Clad Steel Plates fur Spe-cial Applications.
E 23-86 Notched Bar Impact Testing of Metallic Materials. E208-84a Drop-Wcight Test forNil-DuctilityTemperalure of Steels.Art.
Suggestions for Ordering API2H Steel Plates
When ordering steel plates produced in accordance with API Spec 2H, the buyer should specify the following on the order: Specifications
Quantity/Size
Reprocessing (see 3.2) Chemical composition requirements (see footnotes B and D of Table 4.1) Inspection at the mill by the buyer Delivery date and shipping requirements Supplementary requirements API Spce 2H As required 42 or 50 Indicate whether reprocessing according to 3.2 is allowed Indicate whether titanium, vanadium and/or zirconium are allowed If allowed, limit should be stated Precautions and requirements As required The buyer shall specify the following supplementary requirements selected by the buyer on the order S1 Ultrasonic test Low temperature notch toughness 1 Notch toughness at 60℃
Notch toughness at other than -40℃ or -60℃
Single steel plate test
Thickness direction (Z. direction) property test
Low sulfur steel with improved thickness direction properties
Low nitrogen content strain-aging Charpy V-notch impact test with improved notch toughness under strain-aging conditionsTrial production identification
Determination of notch toughness by drop weight test
Note: Chapter 1 of this specification explains the purpose and function of several supplementary requirements.
Special Note: This specification should not be interpreted as the committee preferring any material or process. The purchaser must select materials and processes based on his own experience and the use of the steel plate. Q/HS 7006-93
Chapter 1 Scope
1.1 Scope This specification covers two grades of medium-strength steel plates with a maximum thickness of 100 mm (4 in) for welding structures in marine structures, which are processed by cold forming and welding methods in accordance with API 1S Fec 21. The steel plates in critical parts must be able to resist impact, plastic fatigue and laminar cracking. The welding procedure is very important and should be appropriate for the steel and its application. In other words, the steel should be suitable for processing and welding in shipyard and offshore construction conditions. API SPec 2 and 2Y include similar steels with similar mechanical properties but improved weldability. This improvement is achieved by reducing the chemical composition within the maximum allowable range and changing the heat treatment method and (or) process. 1.2 These steels are used primarily for tubular joints, ribbed plate structures, and other intersections. In these locations, portions of the plate are subjected to tensile loads in the thickness direction (Z direction). Supplementary Requirement S4 provides methods for testing the plate in the thickness direction (Z direction) by the steel manufacturer and establishes acceptance criteria. Supplementary Requirement S1 provides methods for ultrasonic testing of the plate by the steel manufacturer and establishes acceptance criteria. 1.3 Although the properties in the thickness direction are important, no Z direction testing is specified. Supplementary Requirement S5 provides for low sulfur chemical sintering, which is intended to reduce the size and number of sulfide inclusions in the plate. Supplementary Requirement S5 neither replaces the through-thickness testing of S1 nor does it guarantee a minimum through-thickness ductility. Experience has shown that the reduction of area of low sulfur carbon-manganese steels is generally at least 20 percent. Therefore, when testing is not required, Supplementary Requirement S5 may be used instead of Supplementary Requirement S4. If testing is performed, low sulfur steel is required. Supplementary Requirements S1 and S5 are used. 1.4 The notch toughness requirements specified in Chapter 6 or S12 are suitable for underwater or water use in mild climates (minimum working temperature -10°C (14°F)). Cold-formed materials have lower toughness than the original steel plate due to strain, especially in those areas that have been aged due to short columns and braces welding. Chapter 6 provides adjustments to the reduction in toughness caused by deformation and aging. However, the reduction in toughness caused by differences in chemical composition or production process may be much greater than the above. Supplementary Requirements S7 and S8 discuss strain-aging issues. When the strain exceeds 5% or the nitrogen content × strain rat% exceeds 0.040, S7 and (or) S8 should be considered. Supplementary Requirement S8 provides "test requirements at specific temperatures and strain levels of concern. It is recommended that inexperienced buyers use it when ordering materials. 1. 4. 1 When the operating temperature is low, a lower test temperature should be considered. Supplementary requirement S2 specifies impact tests at temperatures different from those specified in Section 6 or S12. S2.1 specifies the drop chain or Charpy V-shaped notch test at -60°C. S2.2 specifies the test at a temperature below -20°C but not -60°C.
1.5 Manufacturers who wish to mark the API monogram on products that comply with this specification must submit relevant education, training, experience materials and (or) assessment results to the American Petroleum Institute and obtain approval to ensure that production personnel are competent for the requirements for chemical analysis, inspection, testing and nondestructive testing specified or referenced in this specification.
Chapter 2 General Requirements for Delivery
2.1 Materials furnished under this specification shall conform to Chapters 4, 9, 13, 14, 18, and 19 of ASTM A6/A6M-87d, General Requirements for Rolled Steel Plates Sheet Piling. and Bars for Structural Use, and shall be marked in accordance with the provisions of Chapter 7.
2.2 All shall be inspected daily for the presence of surface defects. Chapter 3, Manufacturing
3.1 Except as otherwise permitted in 3.2, all plates shall be normalized by the material manufacturer. 3.2 Reprocessing No. 50 steel plate with a nominal thickness exceeding 63.5 mm (2 in) in thickness may be subjected to normalizing and tempering treatment if the minimum mechanical properties are achieved by normalizing, if approved by the purchaser, by heating to between 815°C (1500°F) and 925°C (1700°F) to produce an austenitic structure, holding for a sufficient time to allow the entire material to reach uniform temperature, and then quenching in a suitable medium and quenching at a temperature within the range of 595 to 705°C (1100 to 1300°F).
Q/HS 7006 - 93
Section 4
Chemical Requirements
4.1 The steel shall conform to the chemical composition requirements specified in Table 4.1 and the additional requirements of 1.2. 4.2 Carbon Equivalent (CE)
4.2.tThe Carbon Equivalent (CE) shall be calculated and reported. The CE value is determined by the following formula: CE = C + Mn/6 + (Cr + Mo + V) / 5 + (Ni + Cu) / 15 The maximum carbon equivalent is as follows;
263. 5 mm (2% in)
53. 5 mm (2% in)
$50. 8 mm (2 in)
>50. 8 mm (2 in)
4.3 Any intentionally added elements and all elements in the CE formula shall be reported. 4.4 Boron, vanadium, zirconium, antimony and other rare earth metals shall not be intentionally added without the specific approval of the purchaser. CE.
4.5 If any of the elements listed in 4.4 are added, the steel plate shall be marked with additional benefits in accordance with the provisions of 7.Id. Table 4.1 Chemical (composition) requirements
Carbon, maximum content
Continued + maximum content is
Sulfur, maximum content
Aluminum, total
Nitrogen, maximum content
Decoration, maximum content\
Sampling status
Pre-furnace analysis
Product analysis
Pre-furnace analysis
Product analysis
Pre-analysis
Product Analysis
Pre-analysis
Product analysis
Pre-analysis
Product analysis
Pre-analysis
Product analysis
Pre-analysis
Product analysis
Pre-analysis
Product analysis
Pre-analysis
Product analysis
Required weight percentage
0.90~~1. 35 ° | 06 | | tt | 02-~ 0. 06
0. 015~~ 0. 06
The manganese content in pre-treatment analysis is 1. 60, and in product analysis it is 1.72.It is allowed at the material manufacturer's option. Note: A
No intentional addition is allowed without the purchaser's special approval. In this case, the maximum values for the furnace analysis and product analysis are 0.02%3
and 0.03% respectively. If there is a minimum value, it should be agreed upon and indicated on the order.
1No intentional addition is allowed without the purchaser's special approval. In this case, the limits of the furnace analysis and product analysis should be agreed upon and indicated on the order.
EIf no cerium or rare earth metals are added, no analysis is required. 2
Q/HS 7006—$3
Chapter 5 Mechanical Properties Requirements
5.1 The material represented by the test specimen shall conform to the tensile property requirements given in Table 5.1. Table 5.1 Tensile performance requirements
Confirmation point
MPa(ksi)Minimum value
t63.5 mr(2.5 in)
345(50)t>63.5mm(2.5 in)
Tensile strength
MPe(ksi)
Elongation (%, minimum value)
50 mm or 2:n
200 mm or 8 in
289(42)
289(42)
427~565(62--82)
Chapter 6 Notch Toughness Requirements
345(50)）
324(47)
183~620(70~90)
6.1 The impact test shall be conducted by Charpy V-notch test. The sampling position of the impact specimen shall be close to the sampling position of the thinnest and thickest steel plates of the same heat number steel for tensile test. When the same heat number steel is less than 50t, only one test shall be conducted. If the requirements are more stringent, the provisions of Supplementary Requirements S2 and (or) S12 may be implemented.
The Charpy V-notch impact test shall be conducted on three cross-section specimens in accordance with the provisions of ASTMA370 No. 19. The specimen size, test temperature and energy requirements are shown in Table 6.1. Due to the low carbon and sulfur content, the energy required for full-size specimens often exceeds the limits specified in ASTM E23. To prevent this situation, manufacturers have developed alternative test plans for small-size specimens with any combination of specimen size, energy requirements and test temperature, as shown in Table 6.1, and can be selected from Plans A to E. 6.2 If the average energy of the three specimens is always lower than the specified average value, or the energy value of a single specimen is lower than the minimum value specified for a single specimen, the test can be repeated as follows: a. Repeat the test on the other three specimens, and the energy value of each specimen must be equal to or greater than the specified minimum average energy value. b. If the retest still does not reach the required energy value, the steel plate needs to be normalized or braided and tempered again before retesting.
(.3 After renormalizing or quenching and tempering - Sampling and identification in accordance with the requirements of 6.1. 3
Q/HS 7006-93
Table 6.1 Notch toughness requirements for Charpy √-notch test Specimen size
10×10
10×10
7. 5 ×10
Average minimum energy
J(ft + ib)
34(25)
34(25)
34(25)
26(10)
1B(13)
41(30)
4 1(30)
41(30)
41630)
31(23)
20(15)
Chapter 7
Single minimum energy
(ft · 1b)
27(20)
27(20)
27(20)
20(15)
1 4(10)
34(25)
34(25)
34(25)
34(25)||tt| |26 (19) | | tt | | 18 (13) | 40( 7.1 Plates furnished in accordance with this specification shall be marked by the manufacturer in accordance with Sections 12 and 19 of ASTM A6/A6M. Plates furnished in accordance with Supplementary Speci?cation S3 shall be marked in accordance with Sections 13 and 20.1 of ASTM A20/A20M with the following additional conditions:
a. The API Monogram shall be applied to products conforming to this specification and shall be used only by authorized manufacturers. Manufacturers desiring a license to use the API Monogram should write to the API Dallas Office at 2535 One Main Place, Dallas Texas 75202 for application information or to purchase a license to use the API Monogram.--List, Order No. 811-00005. b. No. 42 steel should be marked with AP12H-42.
No. 50 steel should be marked with API2H-5℃.
C. Steel plates supplied in the initial rolling state (after heat treatment) and heat treated at the metal processing plant will be marked with the suffix "G". Steel plates transmitted after normalizing will be marked with the suffix \N\. Steel plates supplied after quenching and tempering will be marked with the exhibition mark "QT\. For example, the mark of No. 50 steel plate after fire quenching is \API2H-50N". d. If a chemical element mentioned in 4. is added to the steel plate, the mark \C\ should be added immediately after "H\" in the steel plate mark listed in 7.Ib (for example, API2HC-50).
Q/HS 7006—93
Appendix A
Supplementary Requirements
The following supplementary requirements shall apply when agreed upon by both parties and specified on the order: S1 Ultrasonic Testing
S1.1 Each plate shall be subjected to a pulse reflection ultrasonic test in accordance with the requirements of ASTM Specification A 578/A578M, with acceptance criteria of Class I.
S1.2 A test report for each plate shall be provided, with a diagram indicating the range of bottom reflection above 50%. $2 Low Temperature Notch Toughness Test,
S2.1 Notch toughness shall be tested in accordance with the test report of Chapter 6 or the requirements of S12, and shall comply with Table S2.1 (instead of the requirements of Table 6.1 or S12.2).
$2.2 Impact testing may be conducted at temperatures lower than those specified in S6.1 or S12.2 and different from those specified in Table S2.1. The test temperature shall be specified by the purchaser and agreed to by the material manufacturer. S2.3 If the design conditions require higher impact energies, higher energies than those listed in Table S2.1 may be used with the agreement of the purchaser and the steel manufacturer. TABLE S2.1 Notch toughness requirements at lower temperatures Drop-weight test at -55°C (-7°F) “without damage” or more accurate notch test Specimen size
S3 Plate-by-plate test
1t×10
Average minimum energy
J(ft h)
31(25)
48(35)
Single minimum energy basis
27(20)
41(30)
Test temperature
60(76)
-60(--76)
S3.1 When individual plate tests are performed, the plates may be ordered in accordance with Sections 11 and 12 of ASTM Specification A 20/A 20M.
S4 Thickness direction (Z direction) test
S4. 1 This supplementary requirement includes the test procedure and verification standard for the cross-sectional reduction rate of the tensile parts. For steel plates with a thickness equal to and greater than 19 m (% in), the axis of the above-mentioned tensile test specimen is perpendicular to the surface of the steel plate. The definition shall comply with the provisions of ASTM Methods Definitions A370.
S4.2 Number of test specimens: Two test specimens shall be taken for each rolled steel plate (parent material): 4.3 Direction of the test specimen: The axis of the test specimen shall be perpendicular to the steel surface. S4.4 Location of the test specimen: Take a test specimen at the intersection of the axis of the ingot or the longitudinal center line of the cast thick plate and the edge or end face of the steel plate. 54.5 Preparation of the test specimen: The test specimen shall be prepared according to the following requirements: 8.The clamping end is connected to the two opposite surfaces of the steel plate specimen to be tested and the axis is aligned. The connection method used should produce the smallest heat-affected zone on the steel plate specimen to be tested. Friction (destructive) welding, electric bolt welding, electron beam welding or gas shielded metal arc welding have been proven to be suitable. The clamping end material must be selected so that the failure occurs in the steel plate part of the specimen. b. Except for steel plates less than 32mm (1in) thick, 8.75mm (0.350in) specimens can be used. The specimens should be machined into 12.5mm (0.500in) circular specimens according to the shape specified in Figure 5 of ASTM Methods and Definitions A370. c. The entire steel plate should be uniform and without slope. The length of the specimen circle (see *6\ in Figure 5 of ASTM Methods and Definitions A37) is adjusted as needed to allow a specimen of equal diameter to pass through the thickness of the steel plate. S4.6 The test shall be conducted in accordance with the requirements of ASTM Methods and Definitions A370. S4.7 Acceptance Criteria The acceptance criteria for through-thickness tests are as follows: a. The reduction of area of each tensile specimen shall not be less than 30%. If the reduction of area of two specimens taken from the same sheet is less than 30% but not less than 25%, two more specimens shall be cut adjacent to the failed specimen and retested. The reduction of area of both specimens shall be equal to or greater than 30%. The minimum reduction of area specified in S4.a may be determined by mutual agreement between the material manufacturer and the purchaser. S4.8 Marking Sheets accepted in accordance with the through-thickness test procedure shall be stamped or die-marked immediately following the other markings.
S5 Low Sulphur Steel with Improved Thickness Properties S5.1 The purpose of this supplementary requirement is to provide steel plates with low sulfide impurities by chemical control methods, thereby reducing the possibility of lamellar tearing in the weld area. S5.2 Chemical Composition Except for the maximum content of 0.006% in the furnace analysis, the other chemical compositions of the steel plates shall comply with the provisions of Table 4.1. S5.3 Control of Sulfide Shape If the purchase order requires or allows control of sulfide shape, the control method and its requirements shall be agreed upon by the purchaser and the manufacturer.
S5.4 Test in Thickness Direction This supplementary requirement requires tensile testing in the thickness direction (B). S5.5 Marking Steel plates accepted in accordance with this supplementary requirement shall be marked with the mark \LS\ (i.e. API2HXLS) immediately following other markings. Note: \X\ refers to \G\, \N\ or \QT\ required in 7.1". S6 Reduce nitrogen content to improve notch toughness under deformation hardening conditions S6.1 The maximum content of pre-furnace analysis is 0.009%. S6.2 Marking Steel plates accepted in accordance with Supplementary Requirement S6 should be marked with the mark \LV\ (i.e. API2H-50XLN) immediately after other marks. S7 Heavy ratio √-shaped notch impact test after deformation and aging S7.1 Represents the thinnest and thickest steel plates produced in each heat of steel. The material used for Charpy V-shaped notch impact test specimens is cut. The uniformity of the specimen before cutting is 5%, which can be larger if necessary. It is subjected to axial tension and aged for 1 hour at 250℃ (480F). Toughness requirements (impact energy and test temperature) are determined by the purchaser:
S7.2 Marking Steel plates accepted in accordance with Supplementary Requirement S7 should be marked with the mark "SC" (i.e. API 2H-50XSC). S9 Trial Production Qualification
S9.1 This supplementary requirement stipulates that steels within a certain chemical composition range from designated production plants shall be pre-qualified using special welding and mechanical test methods in combination with specific steelmaking and rolling processes. The purpose of this supplementary requirement is to minimize the time and test workload for preparation and welding process assessment at the processing and manufacturing site. S9.2 The required special test methods are included in the third and fourth intentions of API RP 2Z. If the manufacturer provides satisfactory information to the buyer, the manufacturer's pre-qualification results will be accepted for the implementation of this supplementary requirement. S9.3 The crack tip opening displacement (CTOD) test of the weld heat affected zone should be carried out in accordance with the provisions of Chapter 3 of API RP2Z. The following test requirements are specified,
Heat input: 1. 5~5 kJ/mm (38~127 kJ/in) preheat temperature, 10°C to 250°C (212 to 480°F)
Required CTOD value:
For plates less than and equal to 75 mm (3 in) in thickness: 0.25 mm (0.010 in) at 10°C (14°F)For plates thicker than 75 mm (3 in):
0.38 mm (0.015 in) at -10°C (14°F)If at the option of the steelmaker or at the discretion of the purchaser, tests with a wider range of heat input and preheat temperatures, with greater CTOD values or lower test temperatures, are permitted, and shall be considered to meet the minimum requirements of this supplemental clause. S9.4 Weldability tests shall be conducted in accordance with the provisions of API RP 2Z, Chapter 4: at the "Conventional Preheat (CP)" grade or the "Modified Preheat (MP)" grade specified by the purchaser, and shall conform to the specified chemical composition. The MP grade test also meets the "CP grade test. S12 Determination of notch toughness by drop hammer test
St2.1 This supplementary requirement specifies the use of the drop hammer test method to determine the notch toughness of steel plates. The test frequency (frequency) is determined by the purchaser. S12.2 For steel plates with a nominal thickness equal to and greater than 16mm (5/8in), the drop chain shall be carried out according to the P-3 specimen in ASTME208. The drop hammer test shall be carried out on two specimens per group at a temperature of -35°C (-30°F). Both specimens shall meet the "no break-6" at the test temperature.1 represents the thinnest and thickest plate produced from each heat of steel. Material for Charpy V-notch impact test specimens. After cutting the specimen, the uniformity becomes 5%, and if necessary, it can be larger. It is axially stretched and aged for 1 hour at 250℃ (480F). Toughness requirements (impact energy and test temperature) are determined by the purchaser:
S7.2 Marking Steel plates accepted in accordance with Supplementary Requirement S7 shall be marked with the mark "SC" (i.e., API 2H-50XSC) immediately after other markings. S9 Pre-production Qualification
S9.1 This supplementary requirement specifies the preliminary qualification of steel from a designated manufacturer within a certain chemical composition range, combined with specific steelmaking and rolling processes, using special welding and mechanical test methods. The purpose of this supplementary requirement is to minimize the time and test work involved in the preparation and welding procedure qualification at the processing and manufacturing site. S9.2 The special test methods required are included in API RP 2Z, Parts 3 and 4. If the manufacturer provides satisfactory information to the purchaser, the manufacturer's preliminary qualification results are acceptable for the implementation of this supplementary requirement. S9.3 The weld heat affected zone crack tip opening displacement (CTOD) test shall be performed in accordance with Chapter 3 of API RP2Z. The following test requirements are specified:
Heat input: 1.5~5 kJ/mm (38~127 kJ/in) Preheat temperature, 10C~250 (212~480F)
Required CTOD value:
For steel plates less than and equal to 75 mm (3 in) in thickness: 0.25 mm (0.010 in) at 10°C (14F) For steel plates thicker than 75 mm (3 in):
0.38 mm (0.015 in) at -10°C (14F) If selected by the steelmaker or determined by the purchaser, tests with a wider range of heat input and preheat temperature, a larger CTOD value or a lower test temperature are permitted. It should be considered to meet the minimum requirements of this supplementary clause. S9.4 The weldability test shall be conducted in accordance with the provisions of Chapter 4 of API RP 2Z: according to the "conventional preheat (CP)" grade or "improved preheat (MP)" grade specified by the purchaser, and shall conform to the specified chemical composition. The MP grade test also satisfies the "CP" grade test. S12 Determination of notch toughness by drop hammer test
St2.1 This supplementary requirement specifies the use of the drop hammer test method to determine the notch toughness of steel plates. The test frequency (frequency) is determined by the purchaser. S12.2 For steel plates with a nominal thickness equal to and greater than 16 mm (5/8 in), the drop chain shall be carried out according to the P-3 specimen in ASTME208. The drop hammer test shall be conducted on two specimens per group at a temperature of -35 °C (-30 °F). Both specimens shall meet the "no break -6 °C" requirement at the test temperature.1 represents the thinnest and thickest plate produced from each heat of steel. Material for Charpy V-notch impact test specimens. After cutting the specimen, the uniformity becomes 5%, and if necessary, it can be larger. It is axially stretched and aged for 1 hour at 250℃ (480F). Toughness requirements (impact energy and test temperature) are determined by the purchaser:
S7.2 Marking Steel plates accepted in accordance with Supplementary Requirement S7 shall be marked with the mark "SC" (i.e., API 2H-50XSC) immediately after other markings. S9 Pre-production Qualification
S9.1 This supplementary requirement specifies the preliminary qualification of steel from a designated manufacturer within a certain chemical composition range, combined with specific steelmaking and rolling processes, using special welding and mechanical test methods. The purpose of this supplementary requirement is to minimize the time and test work involved in the preparation and welding procedure qualification at the processing and manufacturing site. S9.2 The special test methods required are included in API RP 2Z, Parts 3 and 4. If the manufacturer provides satisfactory information to the purchaser, the manufacturer's preliminary qualification results are acceptable for the implementation of this supplementary requirement. S9.3 The weld heat affected zone crack tip opening displacement (CTOD) test shall be performed in accordance with Chapter 3 of API RP2Z. The following test requirements are specified:
Heat input: 1.5~5 kJ/mm (38~127 kJ/in) Preheat temperature, 10C~250 (212~480F)
Required CTOD value:
For steel plates less than and equal to 75 mm (3 in) in thickness: 0.25 mm (0.010 in) at 10°C (14F) For steel plates thicker than 75 mm (3 in):
0.38 mm (0.015 in) at -10°C (14F) If selected by the steelmaker or determined by the purchaser, tests with a wider range of heat input and preheat temperature, a larger CTOD value or a lower test temperature are permitted. It should be considered to meet the minimum requirements of this supplementary clause. S9.4 The weldability test shall be conducted in accordance with the provisions of Chapter 4 of API RP 2Z: according to the "conventional preheat (CP)" grade or "improved preheat (MP)" grade specified by the purchaser, and shall conform to the specified chemical composition. The MP grade test also satisfies the "CP" grade test. S12 Determination of notch toughness by drop hammer test
St2.1 This supplementary requirement specifies the use of the drop hammer test method to determine the notch toughness of steel plates. The test frequency (frequency) is determined by the purchaser. S12.2 For steel plates with a nominal thickness equal to and greater than 16 mm (5/8 in), the drop chain shall be carried out according to the P-3 specimen in ASTME208. The drop hammer test shall be conducted on two specimens per group at a temperature of -35 °C (-30 °F). Both specimens shall meet the "no break -6 °C" requirement at the test temperature.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.