410S vs 410 — which for a welded fabrication?

410S. Plain 410 hardens in the weld zone and cracks without preheat and post-weld temper; 410S was designed to stay soft and ductile, at the price of lower strength.

Grades · Stainless Steel · 410S

410S

Data verified

410S is the low-carbon, non-hardening version of 410: with carbon held below 0.08% it does not form brittle martensite in weld heat-affected zones, keeping the ductility and formability that plain 410 loses when welded.

Hardness≤183 HB (annealed)

DIN1.4000

AISI410S (UNS S41008)

GB0Cr13 (legacy)

CategoryStainless Steel

Chemical composition

Element	Content (%)
C	≤0.08
Si	≤1.00
Mn	≤1.00
P	≤0.040
S	≤0.030
Cr	11.50–13.50

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 MPa
Yield strength	≥205 MPa
Density	7.70 g/cm³
Magnetic	Yes

Heat treatment

Anneal 830–900 °C. The low carbon deliberately prevents hardening — 410S stays soft and ferritic through weld thermal cycles.

Equivalent grades

Standard	Designation
din	1.4000
aisi	410S (UNS S41008)
gb	0Cr13 (legacy)

Compare side by side: 410S vs 410 · 410S vs 410L

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

Applications & Processing

Applications: Exhaust system components, petrochemical internals, annealing boxes, rail and bus body structures, welded 12% Cr fabrications.

Processing: Excellent weldability for a stainless grade (no preheat in thin sections), good formability; corrosion resistance is mild-service only, as with all 12% Cr grades.

FAQ

410S vs 410 — which for a welded fabrication?: 410S. Plain 410 hardens in the weld zone and cracks without preheat and post-weld temper; 410S was designed to stay soft and ductile, at the price of lower strength.

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Source: ASTM A240 published ranges (UNS S41008) · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.