Key Feature

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

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

Common Designations

UNS S41000
AISI 410
ASTM A268 TP410 (Seamless Ferritic/Martensitic Pipe)
EN 1.4006, X12Cr13
JIS SUS410

ASTM A268 is the primary specification for general service martensitic stainless steel pipe.

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

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%

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)
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

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

Pressure Ratings

Schedule 40/80: Standard pressure ratings
ASME B31.3 compliance for specific conditions
Heat treated versions have different ratings

Pressure ratings depend on heat treatment condition; consult manufacturer specifications.

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.

Welding Characteristics

Requires pre-heat (200-300°C) and post-weld heat treatment
Possible cracking if not properly handled
Matching filler metals required
Post-weld annealing recommended

More challenging to weld than austenitic grades; requires specialized procedures.

Key Standards

ASTM A268 TP410: General Service Pipe
ASTM A731/A731M: Seamless Pipe
AMS 5613 (Aerospace)
EN 10216-5: Seamless Pressure Tubes
ASME SA268: Code Construction

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

Common Applications

• Mechanical Components: Pump shafts, valve stems, mechanical tubing
• Wear-Resistant Piping: Slurry lines, abrasive material transport
• Fastener Systems: High-strength threaded pipe, coupling systems
• Oil & Gas: Wellhead components, valve trim (non-corrosive services)
• Power Generation: Feedwater heater tubes, turbine components
• Automotive: Fuel injection lines, high-pressure fuel pipes
• General Engineering: High-strength structural piping, support systems

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