JIS G 3206-1993 High-Strength Chromium Molybdenum Steel Forgings for High-Temperature Pressure Vessels
This standard prescribes the requirements for high-strength chromium molybdenum steel forgings for use in high-temperature pressure vessels. High-strength chromium molybdenum steel forgings for high-temperature pressure vessels are defined as those that meet the requirements of the standard and have the strength for working out at temperatures over 450 ℃ and have a higher creep resistance than AISI 430 or JIS STS 431 materials.
High-strength chromium molybdenum steel forgings shall be produced with the assistance of mill machines, hot forming and/or thermal cutting/welding processes. The formation process shall be designed to ensure that the temperature, pressure and time parameters given in the standard are met. Requirements regarding dimensions, shape and position, surface quality, and heat treatment are also included in the standard.
High-strength chromium molybdenum steel forgings shall conform to the mechanical properties specified in this standard. Tensile tests shall be made on samples taken from finished forgings in accordance with the procedures specified in the standard. The base metal shall meet the requirements given in this standard in respect of Charpy V-notch impact energy and bend test.
This standard applies to high-strength chromium molybdenum steel forgings for pressure vessels used in petrochemical and other industries. This standard does not apply to forgings for use in boilers. The most important characteristics of these forgings are: high tensile strength, good resistance to high-temperature creep and good high-temperature corrosion resistance.
The requirements and test methods for high-strength chromium molybdenum steel forgings for high-temperature pressure vessels are prescribed in this standard. The other aspects of inspection and quality control, acceptance, marking and inspection documents, as well as the preparation, keeping and transmission of documents, are also covered in this standard.
The primary purpose of this standard is to ensure that high-strength chromium molybdenum steel forgings used in high-temperature pressure vessels meet the requirements of strength, toughness, creep and corrosion resistance, which are critical to their safe operation. This standard is designed to ensure that the forgings produced meet the required quality and safety standards and therefore enable all users of forgings to perform efficient, cost-effective and safe operations.