Stainless steel grade · Martensitic

AISI 431 · EN 1.4057

Martensitic grade with chromium and nickel: high strength with good corrosion resistance; for shafts and heavily loaded parts.

Equivalents and designations

The same grade is named differently in each standard. Use the table to check a match.

SystemDesignation
AISI / ASTMAISI 431
EN material number1.4057
EN steel name (DIN EN 10088)X17CrNi16-2
UNSS43100
JISSUS431
Look up other equivalents →

Chemical composition

C max.
0.12–0.22
Cr
15–17
Ni
1.5–2.5
Mo
—
Other
—

Typical values, wt %, per EN 10088-2 and ASTM A240.

Mechanical and physical properties

Structure
Martensitic
Rm (MPa)
—
Rp0.2 (MPa)
—
A (%)
—
PREN
—
Corrosion
Level 2 of 5
Weldability
Poor
Magnetic
Yes
Density
7.7 g/cm³

ASTM A240 minimums for annealed material; a dash means the value depends on product form.

Typical uses

  • Shafts and heavily loaded parts
  • Marine and light aerospace parts
  • High-strength fasteners and valves

Related grades

AISI 420AISI 430AISI 430FAISI 430L

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The data is for guidance and does not replace the heat certificate. The binding values are those of the standard and the manufacturer's certificate.