Table of Contents
Which stainless steel is martensitic?
The most common types of martensitic stainless strip grades are 410 Stainless Steel, 420 Stainless Steel, and 440A. These martensitic stainless steels react to heat treatment much like high carbon steel alloys. The maximum quenched hardness depends primarily on the carbon content.
How is martensitic steel made?
They are hardenable by heat treatment (specifically by quenching and stress relieving, or by quenching and tempering (referred to as QT). The alloy composition, and the high cooling rate of quenching enable the formation of martensite. Untempered martensite is low in toughness and therefore brittle.
What is the microstructure of martensitic stainless steel?
Martensitic steels have a predominantly lath martensite microstructure, as shown in Figure 2.9, and are formed by continuous annealing in the austenite region followed by rapid quenching of the steel. Higher hardenability is achieved by increased carbon content, typically of the order of 0.25 weight percent carbon.
What is stainless steel made of?
Like all other kinds of steel, stainless steel is made primarily from iron and carbon in a two-step process. What makes stainless steel different is the addition of chromium (Cr) and other alloying elements such as nickel (Ni) to create a corrosion-resistant product.
Is 316 stainless steel martensitic?
Transformation from non-magnetic to magnetic phases As both 316 and 304 stainless steels are austenitic, when they cool, the iron remains in the form of austenite (gamma iron), a phase of iron which is nonmagnetic.
What is the difference between austenitic and martensitic stainless steel?
What is the Difference Between Austenitic and Martensitic Stainless Steel? Austenitic stainless steel is a form of stainless steel alloy which has exceptional corrosion resistance and impressive mechanical properties, while martensitic stainless steels is an alloy which has more chromium and ordinarily no nickel in it.
What is the difference between 300 and 400 series stainless steel?
300 and 400 series have comparable tensile strength and yield strength. 300 Series grades are highly ductile. On the contrary, 400 series grade has higher carbon content, tend to have more hardness than 300 series. Grade 400 series grades are stronger.