439 costs less (no nickel), resists chloride stress corrosion, but has lower general corrosion resistance and toughness; it is common in exhaust and sugar-evaporator tubing where those trade-offs suit.

Grades · Stainless Steel · 439

439

Data verified

439 is a stabilised 17–19% chromium ferritic stainless with low carbon and nitrogen, giving better formability, weldability and corrosion resistance than 430. It is used for exhaust systems and heat-exchanger tubing as a lower-cost alternative to 304.

Hardness≤183 HB (annealed)

DIN1.4510

AISI439

GB06Cr17Ti

CategoryStainless Steel

Chemical composition

Element	Content (%)
C	≤0.03
Si	≤1.00
Mn	≤1.00
P	≤0.040
S	≤0.030
Cr	17.00–19.00
Ni	≤0.50
Ti	0.20+4×(C+N)–1.10
N	≤0.03

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

Properties

Delivery condition	Annealed
Hardness	≤183 HB (annealed)
Tensile strength	415–585 MPa
Density	7.70 g/cm³
Magnetic	Yes

Heat treatment

Anneal 845–900 °C, air cool. Titanium stabilisation with low interstitials keeps the structure fully ferritic.

Equivalent grades

Standard	Designation
din	1.4510
aisi	439
gb	06Cr17Ti

Compare side by side: 439 vs 430 · 439 vs 444

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

Applications & Processing

Applications: Automotive exhaust manifolds and converters, heat-exchanger tubes, sugar industry equipment, appliance parts.

Processing: Good deep drawing for a ferritic; welds satisfactorily in thin sections; resists chloride stress-corrosion cracking that affects austenitics.

FAQ

439 vs 304 tube?: 439 costs less (no nickel), resists chloride stress corrosion, but has lower general corrosion resistance and toughness; it is common in exhaust and sugar-evaporator tubing where those trade-offs suit.

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Source: ASTM A240 / EN 10088 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.