Zeron 100
Encyclopedia
Zeron 100 is a superduplex stainless steel
developed by Rolled Alloys (formerly Weir Materials). The alloy has excellent corrosion resistance combined with high strength. It typically contains 25% chromium
and 7% nickel
and 3.6% molybdenum
along with copper
and tungsten
additions. Zeron 100 has a 50–50 austenitic-ferritic structure. It also has greater resistance to chloride pitting, crevice corrosion
and stress corrosion cracking
than exhibited by the standard 300 series stainless steels.
The UNS
Designation of the Zeron 100 is S32760
Zeron 100 with a composition of 25% chromium, 3.6% molybdenum and 0.7% tungsten has good pitting resistance to various chloride
s and organics acid
s. Zeron 100 is made to meet a minimum pitting resistance equivalent (PREn) value of 40. The ferritic structure and alloy additions, such as nitrogen
provide yield strengths that are twice that of 300 series stainless steels.
ZERON 100 plate is included in the ASTM A240 specification. Its minimum room temperature mechanical property requirements are 109,000 psi (ultimate tensile strength), 80,000 psi (0.2% offset yield strength) and 25% minimum elongation.
Zeron 100 has a copper addition which provides good resistance to sulfuric acid
. For this reason, it is used in acid leach mining applications, steel pickling and other industries where sulfuric acid is encountered.
There are modified versions of Zeron 100 for specific applications. Zeron 100FG is a fastener grade of round bar. It is a cold drawn product with higher strength properties than standard Zeron 100. Zeron 100AFP is an advanced forging grade which has been developed for use in subsea oil and gas applications where good mechanical properties must be preserved at temperatures of about −70 °C.
Stainless steel
In metallurgy, stainless steel, also known as inox steel or inox from French "inoxydable", is defined as a steel alloy with a minimum of 10.5 or 11% chromium content by mass....
developed by Rolled Alloys (formerly Weir Materials). The alloy has excellent corrosion resistance combined with high strength. It typically contains 25% chromium
Chromium
Chromium is a chemical element which has the symbol Cr and atomic number 24. It is the first element in Group 6. It is a steely-gray, lustrous, hard metal that takes a high polish and has a high melting point. It is also odorless, tasteless, and malleable...
and 7% nickel
Nickel
Nickel is a chemical element with the chemical symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel belongs to the transition metals and is hard and ductile...
and 3.6% molybdenum
Molybdenum
Molybdenum , is a Group 6 chemical element with the symbol Mo and atomic number 42. The name is from Neo-Latin Molybdaenum, from Ancient Greek , meaning lead, itself proposed as a loanword from Anatolian Luvian and Lydian languages, since its ores were confused with lead ores...
along with copper
Copper
Copper is a chemical element with the symbol Cu and atomic number 29. It is a ductile metal with very high thermal and electrical conductivity. Pure copper is soft and malleable; an exposed surface has a reddish-orange tarnish...
and tungsten
Tungsten
Tungsten , also known as wolfram , is a chemical element with the chemical symbol W and atomic number 74.A hard, rare metal under standard conditions when uncombined, tungsten is found naturally on Earth only in chemical compounds. It was identified as a new element in 1781, and first isolated as...
additions. Zeron 100 has a 50–50 austenitic-ferritic structure. It also has greater resistance to chloride pitting, crevice corrosion
Corrosion
Corrosion is the disintegration of an engineered material into its constituent atoms due to chemical reactions with its surroundings. In the most common use of the word, this means electrochemical oxidation of metals in reaction with an oxidant such as oxygen...
and stress corrosion cracking
Stress corrosion cracking
Stress corrosion cracking is the unexpected sudden failure of normally ductile metals subjected to a tensile stress in a corrosive environment, especially at elevated temperature in the case of metals. SCC is highly chemically specific in that certain alloys are likely to undergo SCC only when...
than exhibited by the standard 300 series stainless steels.
The UNS
Unified numbering system
The unified numbering system is an alloy designation system widely accepted in North America. It consists of a prefix letter and five digits designating a material composition. A prefix of S indicates stainless steel alloys, C for copper, brass, or bronze alloys, T for tool steels, etc...
Designation of the Zeron 100 is S32760
Zeron 100 with a composition of 25% chromium, 3.6% molybdenum and 0.7% tungsten has good pitting resistance to various chloride
Chloride
The chloride ion is formed when the element chlorine, a halogen, picks up one electron to form an anion Cl−. The salts of hydrochloric acid HCl contain chloride ions and can also be called chlorides. The chloride ion, and its salts such as sodium chloride, are very soluble in water...
s and organics acid
Acid
An acid is a substance which reacts with a base. Commonly, acids can be identified as tasting sour, reacting with metals such as calcium, and bases like sodium carbonate. Aqueous acids have a pH of less than 7, where an acid of lower pH is typically stronger, and turn blue litmus paper red...
s. Zeron 100 is made to meet a minimum pitting resistance equivalent (PREn) value of 40. The ferritic structure and alloy additions, such as nitrogen
Nitrogen
Nitrogen is a chemical element that has the symbol N, atomic number of 7 and atomic mass 14.00674 u. Elemental nitrogen is a colorless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.08% by volume of Earth's atmosphere...
provide yield strengths that are twice that of 300 series stainless steels.
ZERON 100 plate is included in the ASTM A240 specification. Its minimum room temperature mechanical property requirements are 109,000 psi (ultimate tensile strength), 80,000 psi (0.2% offset yield strength) and 25% minimum elongation.
Zeron 100 has a copper addition which provides good resistance to sulfuric acid
Sulfuric acid
Sulfuric acid is a strong mineral acid with the molecular formula . Its historical name is oil of vitriol. Pure sulfuric acid is a highly corrosive, colorless, viscous liquid. The salts of sulfuric acid are called sulfates...
. For this reason, it is used in acid leach mining applications, steel pickling and other industries where sulfuric acid is encountered.
There are modified versions of Zeron 100 for specific applications. Zeron 100FG is a fastener grade of round bar. It is a cold drawn product with higher strength properties than standard Zeron 100. Zeron 100AFP is an advanced forging grade which has been developed for use in subsea oil and gas applications where good mechanical properties must be preserved at temperatures of about −70 °C.