NIMS Issues Creep Data Sheet No. 57 and Metallographic Atlas of Long-term Crept Materials No. M-7A
2010.04.23
National Institute for Materials Science
The National Institute for Materials Science issued the following two items as part of its efforts to improve the intellectual infrastructure under its Mid-Term Program.
Abstract
(March 31, 2010) The National Institute for Materials Science (President: Sukekatsu Ushioda) issued the following two items as part of its efforts to improve the intellectual infrastructure under its Mid-Term Program.
- “NIMS CREEP DATA SHEET No. 57 Data Sheets on the Elevated-temperature Properties of 18Cr-10Ni-Nb Stainless Steel Tube for Boilers and Heat Exchangers (ASME SA-213/SA-213M Grade TP347HFG)”
- “NIMS CREEP DATA SHEET: Metallographic Atlas of Long-term Crept materials No. M-7A Micrographs and Microstructural Characteristics of Crept Specimens of Centrifugally Cast 25Cr-20Ni-0.4C Steel Tube (SCH 22-CF)”
Contents Issued
NIMS CREEP DATA SHEET No. 57 is a Data Sheets on the Elevated-temperature Properties of 18Cr-10Ni-Nb Stainless Steel Tubes for Boilers and Heat Exchangers (ASME SA-213/SA-213M Grade TP347HFG), and has been issued recently as the first edition on this material.
This Creep Data Sheet contains creep rupture data for the test piece that ruptured at a maximum test time of 26,000 hours, high temperature tensile data, optical microscope photographs of the microstructure of the received material, etc. for one heat of ASME SA-213/SA-213M Grade TP347HFG, which was developed recently as a stainless steel tube for high efficiency thermal power plants.
Metallographic Atlas of Long-term Crept Materials No. M-7A is a revised edition of Metallographic Atlas of Long-term Crept Materials No. M-7, which was issued on March 31, 2008, and is the 9th volume in the series of NIMS Metallographic Atlas of Long-term Crept Materials. Centrifugally cast tubes are manufactured using centrifugal force by pouring molten steel into a mold rotating at high speed. This method makes it possible to obtain high density products with minimal casting defects.
The properties of materials deteriorate accompanying long-term use at high temperatures due to changes in the metallic microstructure. Therefore, this NIMS photograph collection presents optical microscope photographs of the microstructure, transmission electron microscope (TEM) photographs of the microstructure, the results of identification of precipitates, precipitation start line diagrams, chemical compositional change diagrams for the precipitates, and hardness change diagrams for a long-term creep test with a maximum duration of approximately 100,000 hours (equivalent to approx. 11 1/2 years) at high temperatures from 800-1,100°C of 1 representative cast showing average creep properties from among a total of 14 casts. As new contents, this revised edition includes optical microscope photographs of the microstructure taken at low magnification (25x), which is important information for this steel but was not included in the first edition (No. M-7). Furthermore, in order to show the differences in microstructure, etc. between casts, the collection also includes optical microscope photographs and TEM photographs of the microstructures after the long-term creep test for casts with different precipitation behaviors, as well as compositional analysis data on the precipitates, time- and temperature-dependent changes in hardness, and other information.
This Creep Data Sheet contains creep rupture data for the test piece that ruptured at a maximum test time of 26,000 hours, high temperature tensile data, optical microscope photographs of the microstructure of the received material, etc. for one heat of ASME SA-213/SA-213M Grade TP347HFG, which was developed recently as a stainless steel tube for high efficiency thermal power plants.
Metallographic Atlas of Long-term Crept Materials No. M-7A is a revised edition of Metallographic Atlas of Long-term Crept Materials No. M-7, which was issued on March 31, 2008, and is the 9th volume in the series of NIMS Metallographic Atlas of Long-term Crept Materials. Centrifugally cast tubes are manufactured using centrifugal force by pouring molten steel into a mold rotating at high speed. This method makes it possible to obtain high density products with minimal casting defects.
The properties of materials deteriorate accompanying long-term use at high temperatures due to changes in the metallic microstructure. Therefore, this NIMS photograph collection presents optical microscope photographs of the microstructure, transmission electron microscope (TEM) photographs of the microstructure, the results of identification of precipitates, precipitation start line diagrams, chemical compositional change diagrams for the precipitates, and hardness change diagrams for a long-term creep test with a maximum duration of approximately 100,000 hours (equivalent to approx. 11 1/2 years) at high temperatures from 800-1,100°C of 1 representative cast showing average creep properties from among a total of 14 casts. As new contents, this revised edition includes optical microscope photographs of the microstructure taken at low magnification (25x), which is important information for this steel but was not included in the first edition (No. M-7). Furthermore, in order to show the differences in microstructure, etc. between casts, the collection also includes optical microscope photographs and TEM photographs of the microstructures after the long-term creep test for casts with different precipitation behaviors, as well as compositional analysis data on the precipitates, time- and temperature-dependent changes in hardness, and other information.