Doors and Frames

	Doors and frames are available in 16ga. or 14ga. stainless steel in 304, 316 or 317 alloy. Finishes are available in #2B or #4 polish.
	Frames are available knockdown or welded in the same frame profiles as standard steel. 90o Hospital Stops are available.
	Doors have fully welded edges with Honeycomb, Polystyrene or Polyurethane cores. Stainless steel hat section door stiffeners are available.
	Doors and frames are available with Underwriters Lab fire rating. See Millennium Product section for applications.
	All door components in DERONDE's stainless steel doors and frames are stainless steel.
	Applications for use of stainless steel doors include waste water treatment plants, pharmaceutical facilities, swimming pools, shower rooms, saunas, and food processing facilities.
	Most applications in hollow metal are also available in stainless steel.

Benefits of Stainless Steel

1. Corrosion resistance
   Lower alloyed grades resist corrosion in atmospheric and pure water environments, while high-alloyed grades can resist corrosion in most acids, alkaline solutions, and chlorine bearing environments, properties which are utilize in process plants.

2. Fire and heat resistance
   Special high chromium and nickel-alloyed grades resist scaling and retain strength at high temperatures.

3. Hygiene
   The easy cleaning ability of stainless makes it the first choice for strict hygiene conditions, such as hospitals, kitchens, abattoirs and other food processing plants.

4. Aesthetic appearance
   The bright, easily maintained surface of stainless steel provides a modern and attractive appearance.

5. Strength-to-weight advantage
   The work-hardening property of austenitic grades, that results in a significant strengthening of the material from cold-working alone, and the high strength duplex grades, allow reduced material thickness over conventional grades, therefore cost savings.

6. Ease of fabrication
   Modern steel-making techniques mean that stainless can be cut, welded, formed, machined, and fabricated as readily as traditional steels.

7. Impact resistance
   The austenitic microstructure of the 300 series provides high toughness, from elevated temperatures to far below freezing, making these steels particularly suited to cryogenic applications.

8. Long term value
   When the total life cycle costs are considered, stainless is often the least expensive material option.

Material Selection

Many variables characterize a corrosive environment -- i.e. chemicals and their concentration, atmospheric conditions, temperature, time, so it is difficult to select which alloy to use without knowing the exact nature of the environment. However, there are guidelines.

Type 304 serves a wide range of applications, it withstands ordinary rusting in architecture, it is resistant to food processing environments (except possibly for high temperature conditions involving high acid and chloride contents), it resists organic chemicals, dyestuffs, and a wide variety of inorganic chemicals. Type 304L (low carbon) resists nitric acid pitting, and sulfuric acids at moderate temperature and concentrations. It is used extensively for storage of liquefied gases, equipment for use as cryogenic temperatures (304N), appliances and other consumer products, kitchen equipment, hospital equipment, transportation, and waste water treatment.

Type 316 contains slightly more nickel than type 304, and 2-3% molybdenum giving it better resistance to corrosion than Type 304, especially in chloride environments that tend to cause pitting. Type 316 was developed for use in sulfite pulp mills because it resists sulfuric acid compounds. Its use has been broadened, however, to handling many chemicals in the process industries.

Type 317 contains 3-4% molybdenum (higher levels are also available in this series) and more chromium than Type 316 for even better resistance to pitting and crevice corrosion.