Our Steel Materials

Austenitic stainless steel is one of the most widely used stainless steel families. It normally contains chromium and nickel, giving it good corrosion resistance, excellent toughness, and good weldability. Nickel-containing stainless steels are also known for good formability and ductility, even at low temperatures.  

Common cast grades include ASTM A743 CF8, CF8M, CF3M, and related EN grades such as 1.4308, 1.4408, and 1.4409

Austenitic stainless steel castings are often used where corrosion resistance is more important than high hardness. Typical applications include:

• Chemical process pump parts 
• Seawater and marine service components 
• Food and pharmaceutical equipment parts 
• Valve bodies and pump casings 
• Corrosion-resistant process equipment 

For example, CF8M / 316 cast stainless steel offers better resistance to acids and pitting corrosion compared with standard CF8 / 304 type stainless steel because of its molybdenum content. 

Martensitic stainless steel is different from austenitic stainless steel. It is valued for its high strength, good toughness, wear resistance, and moderate corrosion resistance. Many martensitic stainless steels can be hardened by heat treatment, which makes them suitable for components that must resist mechanical stress, cavitation, erosion, and impact.

A typical cast martensitic stainless steel grade is ASTM A743 CA-6NM, with comparable EN grade 1.4317, as shown in the attached reference table. CA6NM is an iron-chromium-nickel-molybdenum alloy that is hardenable by heat treatment and is commonly used for pump and valve parts, marine components, chemical equipment, petroleum refining, and power generation applications. 

Typical applications include:

• Marine pump components 
• Seawater pump parts 
• Valve bodies and valve components 
• Hydropower and power plant components 
• Industrial pump casings and covers 
• Components requiring both strength and corrosion resistance 

For marine and pump applications, martensitic stainless steel is often selected when the casting needs better strength and erosion resistance than common austenitic stainless steel, while still maintaining acceptable corrosion resistance.

Low carbon steel castings are known for their good weldability, ductility, machinability, and reliable mechanical performance. Compared with high alloy materials, low carbon steel is usually more economical and easier to process.

A common cast carbon steel grade is ASTM A216 WCB, with comparable EN grade 1.0619, listed in the attached material table. This type of steel is described as a ductile, strong, and weldable cast steel, used for pump support structures and hot water pump applications.

Typical applications include:

• Pump support structures 
• Industrial machinery frames 
• Valve bodies and general engineering castings 
• Pressure-containing components under moderate service conditions 
• Welded steel casting structures

Alloy steel castings are produced by adding alloying elements such as chromium, molybdenum, nickel, manganese, or vanadium to improve strength, toughness, hardenability, wear resistance, and heat resistance.

Compared with ordinary carbon steel, alloy steel can offer better performance under heavy load, impact, high pressure, high temperature, or abrasive working conditions. This makes alloy steel castings suitable for demanding industrial applications.

Typical applications include:

• Heavy machinery components 
• Mining equipment parts 
• Power plant components 
• Pump and valve parts under pressure 
• Wear-resistant and impact-resistant castings 
• Engineering machinery components

Duplex stainless steel has a mixed austenitic-ferritic microstructure. This structure gives duplex stainless steel higher strength than many austenitic stainless steels, together with good corrosion resistance, especially against chloride stress corrosion cracking. Nickel Institute describes duplex stainless steels as having high strength, better fatigue properties, and strong resistance to chloride stress corrosion cracking. 

Common cast duplex stainless steel grades include ASTM A890 Grade 3A and ASTM A890 Grade 1B, with comparable EN grades such as 1.4468 and 1.4517, according to the attached material table.

Typical applications include:

• Seawater pump parts 
• Offshore equipment components 
• Chemical process pump castings 
• Desalination equipment parts 
• Pulp and paper industry components 
• Corrosion-resistant valve and pump components

Super duplex stainless steel is developed for more severe corrosive environments. Compared with standard duplex stainless steel, super duplex grades usually contain higher chromium, molybdenum, and nitrogen, which improves resistance to pitting, crevice corrosion, and chloride corrosion.

Common cast super duplex stainless steel grades include ASTM A890 Grade 5A and ASTM A890 Grade 6A, with comparable EN grades such as 1.4410, 1.4469, 1.4501, and 1.4417, as shown in the attached material reference table.

Typical applications include:

• Offshore oil and gas components 
• Seawater handling equipment 
• Chemical and pulp industry equipment 
• High-chloride process pump parts 
• Marine pump and valve castings 
• Highly corrosive process equipment