ASTM A508/A508M-23a PDF
Standard Specification for Quenched and Tempered Vacuum-Treated Carbon and Alloy Steel Forgings for Pressure Vessels
Standard Specification for Quenched and Tempered Vacuum-Treated Carbon and Alloy Steel Forgings for Pressure Vessels
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 9
- Дата публикации:
- 1 ноября 2023 г.
- Издание:
- A508/A508M
- ICS:
- 77.140.30
ABSTRACT This specification covers quenched and tempered vacuum-treated carbon and alloy steel forgings for pressure vessels, such as those used in reactor systems, specifically, vessel closures, shells, flanges, tube sheets, rings, heads, and similar parts. Steels shall be manufactured by basic electric-furnace process except when secondary ladle refining or remelting process is employed, and shall be vacuum treated prior to or during the pouring of the ingot. Materials shall also go through preliminary heat treatment and quenching for mechanical properties. Heat and product analyses shall be executed to evaluate the conformance of the forgings with specified chemical requirements. Tension and Charpy impact tests shall also be performed to examine the conformance of steel specimens with the following mechanical properties: tensile strength, yield strength, elongation, and reduction of area. Nondestructive inspection procedures, such as magnetic particle examination, and longitudinal wave and angle beam ultrasonic examination, shall also be carried out. Repair welding may be permitted at the option of the purchaser. SCOPE 1.1 This specification2 covers quenched and tempered vacuum-treated carbon and alloy steel forgings for pressure vessels such as those used in reactor systems. Specifically, it covers forgings for vessel closures, shells, flanges, tube sheets, rings, heads, and similar parts. 1.2 All grades are considered weldable under proper conditions. Welding technique is of fundamental importance, and it is presupposed that welding procedure and inspection will be in accordance with approved methods for the grade of material used. 1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.4 Unless the order specifies the applicable “M” specification designation, the material shall be furnished to the inch-pound units. Note 1: Grades 1 and 1A are composed of different chemistries but have the same mechanical requirements. Note 2: Designations have been changed as follows: Current Formerly Grade 1 Class 1 Grade 1A Class 1A Grade 2 Class 1 Class 2 Grade 2 Class 2 Class 2A Grade 3 Class 1 Class 3 Grade 3 Class 2 Class 3A Grade 4N Class 1 Class 4 Grade 4N Class 2 Class 4A Grade 4N Class 3 Class 4B Grade 5 Class 1 Class 5 Grade 5 Class 2 Class 5A Grade 22 Class 3 Class 22B Grade 22 Classes 4, 5, 6, and 7 Grade 3V Class 3V 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Abstract
Overview
ASTM A508/A508M-23a is the internationally recognized standard specification for quenched and tempered, vacuum-treated carbon and alloy steel forgings for pressure vessels. Published by ASTM International, this specification outlines the required manufacturing and testing processes for steel forgings used in critical pressure vessel applications, such as reactor systems. The scope covers vessel closures, shells, flanges, tube sheets, rings, and similar components, ensuring high reliability and safety in service environments where structural integrity is paramount.
Key Topics
- Material Types: Covers a range of carbon and alloy steel grades designated for pressure vessel components, all considered weldable under correct processing conditions.
- Manufacturing Requirements: Steel must be produced primarily via basic electric-furnace process, with allowance for secondary ladle refining or remelting if specified. Vacuum treatment is required to reduce gas content, enhancing toughness and performance.
- Heat Treatment: After forging, products must be quenched and tempered, following specific procedures to achieve desired mechanical properties such as tensile and yield strength.
- Chemical and Mechanical Properties: Mandates strict adherence to specified chemical compositions for each grade. Mechanical property requirements such as tensile strength, yield strength, elongation, and reduction of area are verified through tension and Charpy impact testing.
- Testing and Inspection:
- Mechanical Testing: Includes tension and impact tests to verify mechanical requirements.
- Nondestructive Inspection: Forgings must undergo magnetic particle examination and ultrasonic inspection per referenced ASTM practices to detect any internal or surface defects.
- Product Analysis: Chemical analysis is conducted to confirm that production batches meet specification requirements.
- Certification and Marking: Final products must be certified and marked, with detailed records relating to heat treatment, testing methods, and inspection results.
- Repair Welding: Permitted at purchaser’s discretion, with qualifications according to ASME Boiler and Pressure Vessel Code.
Applications
ASTM A508/A508M-23a applies to industries and projects requiring high-strength, tough, and reliable forged steel components for pressure containment. Typical end uses include:
- Nuclear Reactor Components: Such as vessel closures and heads, requiring superior fracture toughness and quality control.
- Shells, Flanges, Rings, and Tubesheets: Essential parts of boilers and pressure vessels in the energy and chemical processing sectors.
- Heavy Industrial Pressure Vessels: Used for processing, storage, and transport in power generation, oil & gas, and petrochemical industries.
- Installation in Critical Environments: Where resistance to brittle fracture, consistent mechanical properties, and purity (low gas and impurity content) are critical to safe long-term performance.
Related Standards
Adherence to ASTM A508/A508M often requires compliance with or reference to additional key standards for pressure vessel steel forgings:
- ASTM A370 - Test Methods for Mechanical Testing of Steel Products
- ASTM A275/A275M & A966/A966M - Magnetic Particle Examination of Steel Forgings
- ASTM A388/A388M - Ultrasonic Examination of Steel Forgings
- ASTM A788/A788M - General Requirements for Steel Forgings
- ASME Boiler and Pressure Vessel Code - Relevant sections for design and fabrication procedures
- ASTM E208 - Drop-Weight Test for Nil-Ductility Transition Temperature
By following ASTM A508/A508M-23a, manufacturers, fabricators, and engineers ensure the structural reliability, safety, and quality control of steel forgings for demanding pressure vessel applications, meeting the stringent standards required in global industries. This specification supports both SI and inch-pound unit systems, with clear requirements to prevent non-conformity.
Keywords: quenched and tempered steel forgings, vacuum-treated carbon and alloy steel, pressure vessel steel, ASTM A508, reactor vessel components, mechanical property testing, nondestructive examination, ASME, steel quality standards.
Технические детали
- Технический комитет
- A01 - Steel, Stainless Steel and Related Alloys
- SKU
- ASTM A508/A508M-23a
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