Martensitic steels chemical composition

The general chemical composition of the martensitic steels is given in Table 4.15. The salient function of the minor elements in the martensitic stainless steels is described briefly in Table 4.16. 

Assume that a hardened steel contains only two phases, martensite and austenite. The problem is to determine the composition of the mixture, when the two phases have the same composition but different crystal structure. The external standard method cannot be used, because it is usually impossible to obtain a reference sample of pure austenite, or of known austenite content, of the same chemical composition as the austenite in the unknown. Instead, we proceed as follows. In the basic intensity equation, Eq. (14-1), we put... 

Low-temperature structural steels include low-, medium-, and high-strength steels. These steels possess a ferritic, austenitic, martensitic, or mixed structure, depending upon their chemical composition. Differences in phase structure account for differences in weldability and properties at temperatures down to 4 K. 

The chemical composition for a number of martensitic Cr steels is given in Table 3.1-54. Tables 3.1-55-3.1-58 review data on recommended heat treatment conditions, mechanical properties, physical properties, and weldability, respectively. 

Table 3.1-54 Chemical composition of martensitic and martensitic-ferritic chromium steels...

Type 410 stainless steel is heat treatable and is the most widely used of the martensitic stainless steels. Its chemical composition is shown in Table 9.1. 

Type 416 stainless steel is a low-carbon-class martensitic alloy, a free-machining variation of type 410 stainless steel. The chemical composition is shown in Table 9.4. It has a maximum continuous operating temperature of 1250°F (675°C) and an intermittent maximum operating temperature of 400°F (760°C). 

This a semiaustenitic stainless steel. In the annealed or solution-annealed condition it is austenitic (nonmagnetic), and in the aged or coldworked condition it is martensitic (magnetic). The chemical composition is shown in Table 13.5. 

Custom 450 is a trademark of Carpenter Technology Corp. It is a martensitic, age-hardenable stainless steel with very good corrosion resistance and moderate strength. Table 13.8 contains its chemical composition. 

In spite of their differences in chemical composition, precipitates, microstructures, etc., similarities in the creep behavior of austenitic stainless steels and tempered martensite-ferritic steels should be noticed such as ... 

Table 10.1 Chemical compositions of JAEA-ODS tempered martensitic steels 9Cr and llCr-ODS steels...

As we will see in Section 10.7 (difficult compatibility with the constraints of the fuel cycle system, or possible problems of fuel-cladding chemical interaction), a main technological concern of 9Cr-ODS steel is its poor corrosion resistance due to its low Cr concentration. IAEA has thus started the development of high Cr ODS tempered martensitic steels (i.e., 1 ICr-ODS steel) to improve the flexibility of ODS steel development [29,36—38]. Table 10.1 shows the chemical composition of... 

Five different materials were selected for these studies two ferritic-martensitic steels (P91 and HCM12A), two austenitic steels (1.4910 and Alloy 800) and the nickel base Alloy 617. Their chemical compositions are listed in Table 11.1. 

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