Key Feature

The Heat-Treatable Martensitic Bar Stock. Combines moderate corrosion resistance with excellent hardenability, strength, and wear resistance through heat treatment.

The most economical heat-treatable stainless steel bar suitable for high-strength and wear-resistant applications.

Common Designations

UNS S41000
AISI 410
ASTM A276 (Stainless Steel Bars)
EN 1.4006, X12Cr13
JIS SUS410

ASTM A276 is the primary specification for general bar applications.

Chemical Composition (Typical wt.%)

C: 0.08 - 0.15
Cr: 11.5 - 13.5
Mn: ≤ 1.00
Si: ≤ 1.00
P: ≤ 0.040
S: ≤ 0.030

Minimum 11.5% chromium provides basic corrosion resistance; carbon enables hardening.

Mechanical Properties (Annealed)

Tensile Strength: ≥ 480 MPa
Yield Strength: ≥ 275 MPa
Elongation: ≥ 20%
Hardness: ≤ 217 HB
Machinability: 50% of B1112 steel

Moderate properties in annealed condition; significantly improvable via heat treatment.

Mechanical Properties (Hardened & Tempered)

Tensile Strength: Up to 1370 MPa
Yield Strength: Up to 1100 MPa
Hardness: Up to 45 HRC
Elongation: Reduced to 10-15%
Machinability (hardened): Poor

Properties vary with heat treatment parameters (quenching temperature, tempering).

Physical Properties

Density: 7.70 g/cm³
Melting Range: 1480 - 1530 °C
Thermal Expansion: 10.8 × 10⁻⁶/K (20-400°C)
Thermal Conductivity: 24.9 W/m·K (100°C)
Strongly magnetic

Lighter than austenitic grades; always magnetic regardless of condition.

Heat Treatment Capability

Austenitizing: 980-1010°C (air or oil quench)
Tempering Range: 150-650°C
Maximum Hardness: ~45 HRC
Annealing: 815-870°C, slow cool

Can achieve wide range of properties through controlled heat treatment cycles.

Available Forms

Rounds: 6mm - 300mm diameter
Squares: 6mm - 150mm
Hexagons: 6mm - 100mm
Flats: Various sizes
Billets: For forging
Forgings: Custom shapes

Comprehensive size range for machining and fabrication.

Surface Conditions

Hot Finished: Black, scaled surface
Cold Finished: Bright, smooth surface
Centerless Ground: Precision dimensions
Polished: For specific applications
Peeled: Improved surface quality

Various surface finishes available for different requirements.

Corrosion Resistance

Moderate resistance to atmospheric corrosion, fresh water, mild chemicals, and steam. Not suitable for marine or acidic environments.

Significantly lower than 304; adequate for many industrial and general-purpose applications.

Machining Characteristics

• Best machined in annealed condition• Heat treat after machining• Tool wear moderate• Chip control good• Surface finish generally good

Typically machined in soft condition, then heat treated to final hardness.

Key Standards

ASTM A276 410: Stainless Steel Bars
ASTM A479 410: Bars for Pressure Vessels
ASTM A484: General Requirements
EN 10088-3: Stainless Steel Bars
JIS G4303: Stainless Steel Bars
ASME SA479: Code Construction

Available in various hardness conditions: annealed, hardened & tempered.

Common Applications

• Cutlery & Tools: Knife blades, scissors, hand tools, cutting implements
• Fasteners: Bolts, screws, nuts, studs requiring strength
• Valve Components: Valve stems, seats, trim parts
• Pump Parts: Shafts, impellers, wear rings
• Surgical Instruments: Forceps, clamps, surgical tools
• Machine Components: Bushings, gears, shafts, wear plates
• Firearm Components: Barrels, receivers, small parts

Ideal where strength, hardness, or wear resistance are more critical than maximum corrosion resistance.