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  CAPABILITIES - STEEL TYPES  
 

Overview of types of steel produced at the Southwest Steel Casting Company.

 
 
 
 

Heat Resistant Steel
Heat resistant steel is designed typically for use in heat treat furnaces and heat exchangers - high nickel and chrome steels. Typical parts include heat treat trays, grids and hangers.

Duplex & Super Duplex
Duplex & Super Duplex steels are a specification and use of materials which combine corrosion resistance with high mechanical strength is a fundamental requirement. Duplex steels introduced the use of a deliberate nitrogen addition in order to improve ductility and corrosion resistance. This class of steel offers excellent castability, weldability and machinability.

22% chromium stainless steels provide better pitting resistance and resistance to crevice corrosion than type 316 stainless steel by virtue of a more stable passive film and also have greater mechanical strength. However, for optimum corrosion resistance, a 25% chromium high alloy duplex stainless steel is required and these alloys are often referred to as super duplex stainless.

Hastelloy
The predominant alloying ingredient is typically the transition metal nickel. Other alloying ingredients are added to nickel in each of the subcategories include varying percentages of the elements molybdenum, chromium, cobalt, iron, copper, manganese, titanium, zirconium, aluminum, carbon, and tungsten.

The primary function of the Hastelloy super alloys is that of effective survival under high temperature, high stress service in a moderately to severely corrosive, and/or erosion prone environment where more common and less expensive iron-based alloys would fail—including the pressure vessels of some nuclear reactors, chemical reactors, and pipes and valves in chemical industry.

Inconel
Inconel alloys are oxidation and corrosion resistant materials well suited for service in extreme environments. Inconel retains strength over a wide temperature range, attractive for high temperature applications where aluminum and steel would succumb to creep as a result of thermally-induced crystal vacancies. Inconel's high temperature strength is developed by solid solution strengthening or precipitation strengthening, depending on the alloy.

Inconel is often encountered in extreme environments. It is common in gas turbine blades, seals, and combustors, as well as turbocharger rotors and seals, high temperature fasteners, chemical processing and pressure vessels, heat exchanger tubing, natural gas processing with contaminants such as H2S and CO2, firearm sound suppressor blast baffles, and Formula One exhaust systems.

Austenitic Steels
Austenitic stainless steels have high ductility, low yield stress and relatively high ultimate tensile strength, when compare to typical carbon steel.

Steels containing high percentages of certain alloying elements such as manganese and nickel which are austenitic at room temperature and cannot be hardened by normal heat-treatment but do work harden. They are also non-magnetic. Typical examples of austenitic steels include the 18/8 stainless steels and 14% manganese steel.

Martensitic Steels
These grades of stainless have chromium in the range of 11% to 17% as the sole major alloying addition. This is the same as the ferritic grades. However, carbon is added in amounts from 0.10 % to 0.65% to radically change the behavior of the martensitic alloys. The high carbon enables the material to be hardened by heat treatment.
 

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 Exotic Alloys

 
 
   
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