Martensitic stainless steel rods and forgings for high temperature use in the United States

Stainless steel 1202 28/06/2023 1045 Sophia

Ferritic stainless steels are alloy steels that are composed of at least 10.5 percent chromium and contain mostly a body-centered cubic (BCC) solid solution phase. Ferritic stainless steels are typically used in applications that require high corrosion resistance and moderate strength. In particul......

Ferritic stainless steels are alloy steels that are composed of at least 10.5 percent chromium and contain mostly a body-centered cubic (BCC) solid solution phase. Ferritic stainless steels are typically used in applications that require high corrosion resistance and moderate strength. In particular, they are well-suited for use in high-temperature environments because they are generally non-magnetic and tend to resist stress corrosion and chloride-induced pitting.

Although ferritic stainless steels are not as strong and impact-resistant as austenitic stainless steels, they offer greater resistance to many corrosive environments and have higher temperature creep and thermal stability compared to other stainless steel alloys. Additionally, unlike austenitic stainless steels, ferritic stainless steels are not hardenable by heat treatment and must rely on cold work instead. Typical applications for ferritic stainless steels include chemical process plants, food processing equipment, automotive trim, medical components, and power generating components.

At elevated temperatures, ferritic stainless steels can become less corrosion-resistant and more brittle, which is why these types of alloys are typically used for lower temperature applications. The most common grade of ferritic stainless steel used for high-temperature applications is AISI 442, also known as 442HQ. This grade of stainless steel is highly resistant to chlorides and provides excellent mechanical properties at temperatures up to 800°F (427°C). Other grades may also be used depending on the specific environment, such as AISI 446, AISI 439, and AISI 444.

When using ferritic stainless steels, it is important to note that weldability is often poor and welds are prone to hot cracking. This is why proper heat treatment is necessary. The proper heat treating procedure is to preheat the material to 1000°F (538°C) before welding and then anneal the parts after welding at a lower temperature of 2100°F (1149°C).

Due to their low strength, ferritic stainless steels are not used for components that are loaded in tension. In such cases, austenitic stainless steel bar or forgings are typically used. For components that have to be exposed to high temperatures for extended periods, ferritic stainless steels are the ideal choice for achieving excellent corrosion resistance and long-term stability.

Put Away Put Away
Expand Expand
Stainless steel 1202 2023-06-28 1045 ZephyrSparkle

Martensitic stainless steel is widely used in high temperature service in the United States. High temperature service refers to external temperature of more than 427℃. Martensitic stainless steel can resist high temperature oxidation and sulfidation corrosion, has excellent heat and torque resist......

Martensitic stainless steel is widely used in high temperature service in the United States. High temperature service refers to external temperature of more than 427℃. Martensitic stainless steel can resist high temperature oxidation and sulfidation corrosion, has excellent heat and torque resistance, allowing it to be used in parts and components that are subject to aggressive conditions under extreme temperatures, such as fasteners, bolts, springs and shafts and so on.

At high temperature, martensitic stainless steel can maintain a higher level of strength and hardness. Generally, martensitic stainless steels are used as castings, forgings and tools and can be hardened by heat treatment to increase strength and hardness. After heating martensitic stainless steel over 800°C, an austenitic microstructure will form, which will enable martensitic stainless steel to maintain good strength and ductility.

Martensitic stainless steel is generally available in grades 410, 410Cb, 420, 416 and 416Se. 410 stainless steel is the most widely used martensitic stainless steel, with the highest strength, hardness, wear resistance and corrosion resistance. The grades 416 and 420 are also often used and their mechanical properties depend on their heat treatment conditions. The 410Cb grade contains the alloying elements niobium as an austenitization aid, which provides excellent hardenability, high strength and corrosion resistance for high temperature applications. The 416Se grade is a modification of 416 stainless steel and contains additional selenium which improves its resistance to corrosion and wear.

In conclusion, martensitic stainless steel is suitable for high temperature service due to its excellent strength, good wear and corrosion resistance, and can be used to produce a variety of parts and components to meet the needs of various applications.

Put Away
Expand

Commenta

Please surf the Internet in a civilized manner, speak rationally and abide by relevant regulations.
Featured Entries
Malleability
13/06/2023
engineering steel
13/06/2023