Duplex stainless steels are virtually immune to stress corrosion cracking the achilles heel of common austenitic stainless steels and are highly resistant to pitting and crevice corrosion. Astm a lists tensile property requirements, but does not require that the tensile tests actually be performed. Heat treatment effects on astm a890a 890m gr 5a super duplex. Duplex stainless steel pipe astm a789 astm a790 astm. The original nonnitrogen bearing version of this alloy was developed by the ohio state university research foundation in conjunction with flowserve corporation, while under. A890 a890m standard specification for castings, ironchromiumnickelmolybdenum corrosionresistant, duplex austeniticferritic for general application, austenite, duplex stainless steel, ferrite, stainless steel, steel castings. There is a conference on the subject of duplex every 23 years where dozens of highly technical papers are presented. These attributes mean that duplex uns s31803, f51, 1.
Cited properties are appropriate for the normalized and tempered condition. Classification and mechanical properties specification average hardness minimum tensile strength minimum yield strength minimum elongation astm a890 grade 1b 245 265 hbn 100,000 psi 689 mpa 70,000 psi 483 mpa 16%. The alloy is usually produced by aod vod vim followed by electroslag refining esr var if necessary for special purpose. When duplex stainless steels are added to these codes, the parent specification will be a995sa995.
Stainless 2205, duplex 2205, uns s31803, stainless steel 2205. Aug 24, 2019 astm a890 pdf posted on august 24, 2019 by admin for internal reference onlydesignation. Imoa is grateful to the international stainless steel forum and. Sandvik saf 2205 is a duplex stainless steel with pre value of min. Duplex stainless steel for severe corrosion environments including seawater conditions. As a result, this is a highly suitable material for applications dealing with environments containing chlorides and and. Properties, production, examples and applications cold rolled steels difference between aisi 316, aisi 316l and aisi 316ln stainless steel electrical steel.
Astm a890 grade 4a datasheet,astm a890 grade 4a chemical. Bar astm a276 or a479 grade s31803 castings astm a890 grade 4a. Duplex describes a family of stainless steels that are neither fully austenitic, like 304 stainless, nor purely ferritic, like 430 stainless. Astm a479 stainless steel astm a53 carbon steel pipes astm a564 stainless steel age hardened alloy steel.
Aciastm cd4mcun astm a890 grade 1b, j93372 cast stainless. Astm a890 a890m 18a standard specification for castings. Thus, the corrosion behavior of astm a890a 890m gr 5a super duplex. Duplex 2205 is a nitrogen enhanced duplex stainless steel that was developed to combat common corrosion problems encountered with the 300 series stainless steels. Astm a890a890m18a standard specification for castings, ironchromiumnickelmolybdenum corrosionresistant, duplex austeniticferritic for general application. Pdf heat treatment effects on astm a890a 890m gr 5a. Pdf heat treatment effects on astm a890a 890m gr 5a super. Astm a182 f51 duplex stainless steel astm a182 f51 is a duplex stainless steel that offers a high resistance to general, pitting, stress and crevice corrosion, as well as a high mechanical strength and good weldability. Astm a995 standard specification for castings, austeniticferritic duplex. Practical guidelines for the fabrication of duplex stainless steels. Specifications the 2205 alloy is available in various product forms. A only requires postweld heat treatment if supplementary requirement. Ce3mn uns s32750, is super duplex stainless steel, with greater corrosive resistance than standard ss2205 and 188 crni and 1814218143 crnimo stainless steel parts, mainly used for service in corrosive conditions. Technical specifications of a890 gr 1a duplex stainless steel, grade astm a890 grade 1a chemical composition, astm a890 grade 1a mechanical properties from steelmaking,hot forgingrolling,heat treatment,cold working.
Wilfleys cd4mcun offers superior mechanical properties to 300 series stainless steels with similar corrosion properties. In addition, it has a slightly higher modulus of elasticity than 316 s. Highly resistant to stress corrosion cracking in chloride environments. Ferrite levels are not specified, but these alloys will develop a range of approximately 30 to. As a mediumalloy duplex stainless steel it has superior corrosion resistance in most media compared to the standard austenitic stainless steel astm 316l and twice the mechanical strength. Possessing these characteristics, it is not surprising to find the majority, but by no means all, of applications to be seawater related. Duplex stainless steel alloy with approximately equal. Heat treatment can modify the corrosion resistance of stainless steels. Duplex stainless steel limitations plate cost duplex stainless steel welding welding is seen as a disadvantage but is probably no more difficult to weld than the austenitics make sure material starts out in the right condition through composition and heat treatment use astm a923 standard and astm a1084 lean for. Chemically identical to this is wilfleys wcd4, but with improved mechanical properties and corrosion resistance. Aci astm cd4mcun steel is a duplex stainless steel formulated for casting. Astm a479 stainless steel astm a53 carbon steel pipes astm a564 stainless. This is the reason why valve companies prefer to specify duplex stainless steels per a995sa995 for control valves. It is indicated by the flowserve casting symbol cd4m.
Astm a890 a890m standard specification for castings. Astm a890 grade 5a heattreated austenitic stainless steel. Astm a890a890m18a standard specification for castings. Cd3mn is a fecrnimo duplex stainless steel, with greater corrosive resistance than standard 188 crni and 1814218143 crnimo stainless steel parts. Final report, volume 1, metallurgical evaluation of cast. Astm a890 grade 1a datasheet,astm a890 grade 1a chemical,astm. Duplex stainless steel grades have a range of corrosion resistance, similar to the range for austenitic stainless steels, i. Grades stainless steel duplex grade astm a815 s31803, 2205, en 1. Aciastm cd6mn astm a890 grade 3a, j93371 cast stainless steel. Cast duplex stainless steels to astm a890 magsen foundry. Ferralium 255 sd50 is a super duplex stainless steel supplied in the hot worked and annealed condition.
Properties, processing and applications carbon steel. In some of the recently developed grades, nitrogen and manganese are used together to bring the nickel content to very low. Jun 27, 2019 astm a890 pdf posted on june 27, 2019 by admin for internal reference onlydesignation. Active standard astm a890 a890m developed by subcommittee. It achieves higher strengths than most other stainless steels and alternative corrosion resistant alloys, offering the potential to reduce section size and therefore weight and cost. Examples include astm a276 stainless steel bar and astm a743 and a744 castings. They are being offered by all the major stainless steel mills for a number of reasons. Astm a890 a890m 18a standard specification for castings, iron. We have 3 suppliers for astm a890 grade 5a heattreated. Fatigue and fatigue corrosion resistance of stainless steels are enhanced by the use of duplex grades higher mechanical properties, chromium content and duplex microstructure s32304 316l 317 ln 316l 2. Duplex stainless steel limitations plate cost duplex stainless steel welding welding is seen as a disadvantage but is probably no more difficult to weld than the austenitics make sure material starts out in the right condition through composition and heat treatment. Duplex stainless steel investment casting compositions wisconsin precision casting.
Structures of duplex stainless steels for astm a8904a cast dss. The duplex stainless classification includes the following astm standards. Astm a890 a890m18a standard specification for castings, ironchromiumnickelmolybdenum corrosionresistant, duplex austeniticferritic for general application. A890a890m standard specification for castings, ironchromiumnickelmolybdenum corrosionresistant, duplex austeniticferritic for general application, austenite, duplex stainless steel, ferrite, stainless steel, steel castings. The duplex stainless steels have general corrosion resistance comparable. Astm a890 grade 4a heattreated duplex stainless steel. It is the responsibility of the purchaser to determine which grade shall be. Duplex stainless steel sandvik materials technology. We can help you find a supplier of astm a890 grade 4a heattreated. Valves and pumps already use a variety of duplex and. Possessing these characteristics, it is not surprising to find the majority, but by no. Duplex stainless steel manual valve in the oil and gas production process. Astma890 standard specification for castings, iron. Cd6mn is the designation in both the aci and astm systems for this material.
Examples include astm a276 stainlesssteel bar and astm a743 and a744 castings. Aci astm cd6mn steel is a duplex stainless steel formulated for casting. Cast duplex stainless steels to astm a890 cast duplex stainless steels are also referred to as duplex stainless steel castings and duplex alloy steel castings. Super duplex stainless steels sdss with approximately equal volume fractions about 50% of ferrite. Duplex stainless use is expanding in valves and pumps.
A890 a890m18a standard specification for castings, ironchromiumnickelmolybdenum corrosionresistant, duplex austeniticferritic for general application duplex stainless steel stainless steel castings steel castings. Bars and, where applicable, forgings are subjected to ultrasonic examination based on the. Astm a890a890m18a red standard specification for castings. Properties, types, production, and applications hot rolled steels introduction. Aciastm cd6mn astm a890 grade 3a, j93371 cast stainless. Jan 04, 2020 astm a890 pdf january 4, 2020 admin for internal reference onlydesignation. Duplex stainless astm a890 astm a995 alloy casting.
Volume fraction of ferrite was measured using manual point count per. Pdf heat treatment can modify the corrosion resistance of stainless steels. Duplex stainless steel investment casting compositions wisconsin precision casting however, one thing is clearmaterials are not added in these codes unless the parent specification requires tensile testing to ensure that the product being supplied actually meets the minimum mechanical properties upon which the design is based. Properties strength of 316 stainless and it is also about 50% harder.
Stainless austenitic stainless martensitic stainless nickel base steels heat resistant stainless precipitation hardened stainless alloy steels carbon steels. Aciastm cd4mcun steel is a duplex stainless steel formulated for casting. The duplex stainless steel alloys have a mixed microstructure of austenite and ferrite, the optimal ratio is 5050, however in actual duplex stainless steel castings the ratio may be 40. Widely used in pumps, especially in abrasive applications, such as the casing and impeller. Aug, 2019 astm a890 pdf for internal reference onlydesignation.