Can 2205 replace 329?

In most new fabrication yes — 2205 has a tighter, more weld-friendly composition and better availability. For certified replacement-in-kind against a SUS329J1 drawing, substitution needs the design authority’s approval.

Grades · Stainless Steel · 329

329

Data verified

329 is the original commercial duplex stainless (the JIS SUS329J1 family), a 25% chromium, low-nickel ferritic-austenitic grade that predates the modern lean and 2205 duplexes. It still appears in Japanese and legacy specifications for chemical and seawater-adjacent equipment.

Hardness≤277 HB

DIN1.4460

AISI329 (UNS S32900)

JISSUS329J1

CategoryStainless Steel

Chemical composition

Element	Content (%)
C	≤0.08
Si	≤0.75
Mn	≤1.00
P	≤0.040
S	≤0.030
Cr	23.00–28.00
Ni	2.50–5.00
Mo	1.00–2.00

Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.

Properties

Delivery condition	Solution annealed
Hardness	≤277 HB
Tensile strength	≥620 MPa
Yield strength	≥450 MPa
Density	7.80 g/cm³
Magnetic	Yes

Heat treatment

Solution anneal 1010–1120 °C, rapid cool. As an early-generation duplex it is less forgiving of slow cooling and welding excursions than 2205.

Equivalent grades

Standard	Designation
din	1.4460
aisi	329 (UNS S32900)
jis	SUS329J1

Compare side by side: 329 vs 2205 Duplex · 329 vs 2304 Duplex

Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.

Applications & Processing

Applications: Heat exchangers, chemical plant components, desalination (legacy), shafts and parts in Japanese-spec equipment.

Processing: Weldable with duplex practice but with a narrower procedure window than 2205; most buyers today substitute 2205 unless the drawing names 329/SUS329J1 explicitly.

FAQ

Can 2205 replace 329?: In most new fabrication yes — 2205 has a tighter, more weld-friendly composition and better availability. For certified replacement-in-kind against a SUS329J1 drawing, substitution needs the design authority’s approval.

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Source: ASTM A240 published ranges (UNS S32900) · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.