Stainless Steel 317L Seamless Pipes & Tubes Manufacturer & Supplier

SS 317L (UNS S31703) contains 3-4% molybdenum, providing significantly better pitting and crevice corrosion resistance than 316L. The low carbon content ensures weldability without sensitization. It bridges the gap between standard austenitic grades and expensive nickel alloys.

UNS: S31703 | Category: Austenitic Stainless Steel | Werkstoff Nr: 1.4438 | EN Name: X2CrNiMo18-15-4

Size Range

Outer Diameter: 1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)

Wall Thickness: SCH 5S to SCH 80S

Chemical Composition (%)

C	Mn	Si	Cr	Ni	Mo	P	S
0.030 max	2.00 max	0.75 max	18.0-20.0	11.0-15.0	3.0-4.0	0.045 max	0.030 max

Mechanical Properties

Tensile Strength: 515 MPa min
Yield Strength: 205 MPa min
Elongation: 35% min
Hardness: 95 HRB max

Physical Properties

Density: 7.98 g/cm3
Melting Range: 1375-1400 C
Thermal Conductivity: 14.4 W/m-K
Electrical Resistivity: 790 nOhm-m
Specific Heat: 500 J/kg-K
Coeff. of Thermal Expansion: 16.5 um/m-C

Corrosion Resistance

Pitting Resistance (PREN): ~29
Max Service Temp (Oxidizing): 870 C
Intergranular Corrosion: Resistant (low carbon)
Stress Corrosion Cracking: Superior to 316L in chlorides
General Corrosion Rate: <0.02 mm/yr in sulfuric acid
Seawater Resistance: Good - superior to 316L

Applicable Standards

ASTM A312 / ASME SA312
ASTM A213 / ASME SA213
ASTM A269
DIN EN 10216-5

Applications

Flue gas desulfurization systems
Pulp & paper bleach plants
Phosphoric acid production
Sulfuric acid processing
Chemical reactor vessels
Organic acid handling

Industries Served

Chemical Processing
Pulp & Paper
Fertilizer
FGD Systems
Pharmaceutical

Key Advantages

Superior pitting resistance vs 316L (PREN ~29 vs ~24)
Excellent resistance to sulfuric and phosphoric acids
Low carbon prevents sensitization during welding
Cost-effective alternative to nickel alloys in many environments
Outstanding resistance in FGD environments

Equivalent Grades

ASTM: TP317L
JIS: SUS 317L
BS: 317S12