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You are here: Home- NewsDuplex stainless steel ASTM 329(S32900)

Duplex stainless steel ASTM 329(S32900)

Posted:8/3/2016 2:18:13 AM

Stainless steels are classified into martensitic, ferritic and austenitic based on their crystalline structure. In addititon, they form another group known as precipitation-hardened steels, which are a combination of martensitic and austenitic steels.

 

Properties

Metric

Imperial

Tensile strength, ultimate

725 MPa

105000 psi

Tensile strength, yield (@0.2%)

550 MPa

79800 psi

Charpy impact

54 J

39.8 ft-lb

Elastic modulus

190 – 210 GPa

27557 – 30458 ksi

Poisson’s ratio

0.27 – 0.30

0.27 – 0.30

Elongation at break (in 50 mm)

25%

25%

Hardness, Brinell

230

230

Hardness, Knoop (converted from Brinell hardness)

253

253

Hardness, Rockwell B

96

96

Hardness, Rockwell C (converted from Brinell hardness)

20

20

Hardness, Vickers (converted from Brinell hardness)

242

242

 

Chemical Composition

C (Carbon)    

0.08% Max

Fe (Iron)

Balance

Mn (Manganese)

1.0% Max

Si (Silicon)

0.75% Max

S (Sulphur)

0.03% Max

P (Phosphorus)

0.04% Max 

Cr (Chromium)

23-28%

Ni (Nickel)

2.5-5.0%

Mo (Molybdenum)

1.0-2.0%

 

Duplex Stainless Steel 329 was one of the earliest duplex steel which is reflected in its higher permitted carbon content. Its resistance to pitting (PREN about 32) and to crevice corrosion is below that of super duplex steels, therefore use in seawater is limited. Exposure to moderate and high temperature and less rapid cooling may cause embrittlement. Accordingly, design stress values in ASME II do not extend above 260°C for S32900. Impact values are high at room temperature. However, the proportion and orientation of ferrite in welds and base material may significantly affect toughness at subzero temperatures.

Duplex Stainless steel 329 can be used for heat exchangers, chemical tanks, refineries, shafts (marine, etc) pressure vessel parts, flanges, fittings & pipes for the oil and gas industries and offshore technology, paper industry, compressor parts and seawater desalination plants amongst many other applications.

 

Katalor is one of the preeminent manufacturers and suppliers of  Duplex Stainless Steel 329 Round Bars. Immensely useful for construction industries, these bars are offered by us in various sizes and finishes to choose from. Complying the industrial norms, our round bars last for long duration and available in bulk quantities at most reasonable rates.

 

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