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317L stainless steel, a low-carbon austenitic alloy, stands out for its robust performance in harsh corrosive environments. Here’s a distinct overview highlighting its unique attributes and applications:
Alloy Structure and Composition
As an austenitic grade, 317L features a face-centered cubic crystal structure stabilized by nickel, ensuring ductility and impact resistance. Its key chemical makeup includes:
Carbon (C): ≤ 0.03% (mitigates carbide precipitation, critical for intergranular corrosion resistance during welding).
Chromium (Cr): 18–20% (forms a protective Cr₂O₃ layer against oxidation and general corrosion).
Nickel (Ni): 11–15% (enhances toughness and resistance to reducing acids).
Molybdenum (Mo): 3–4% (significantly boosts resistance to pitting and crevice corrosion in chloride-laden media, surpassing 316L).
Distinctive Mechanical Traits
Cold Workability: Maintains formability even after severe cold working, ideal for complex fabrications.
Temperature Stability:
Retains strength at sub-zero temperatures (down to -196°C), suitable for cryogenic applications.
Resists scaling up to 870°C, though prolonged exposure above 650°C may slightly reduce corrosion resistance.
Mechanical Values (Annealed):
Tensile Strength: 500–700 MPa
Yield Strength (0.2% offset): ≥ 205 MPa
Elongation: ≥ 45%
Corrosion Resistance Edge
Chloride Environments: Excels in seawater, brine solutions, and paper pulping processes where chloride-induced pitting is a risk.
Acid Resistance: Resists dilute sulfuric acid, formic acid, and acetic acid better than 300-series alloys.
Crevice Corrosion: The higher Mo content shifts the crevice corrosion potential (Ecc) to more positive values, reducing vulnerability in stagnant or oxygen-depleted areas.
Innovative Applications
Desalination Plants: Heat exchangers and pipelines in seawater desalination systems.
Pharmaceutical Equipment: Reactors and tanks for handling corrosive APIs and cleaning agents (e.g., caustic soda and peroxide).
Pollution Control: Scrubbers and ducts in flue gas desulfurization (FGD) systems exposed to sulfuric acid mist.
Offshore Oil & Gas: Subsea valves, risers, and wellhead components in high-salinity, high-pressure environments.
Comparison with 316L
Property
317L Stainless Steel
316L Stainless Steel
Molybdenum Content
3–4%
2–3%
Pitting Resistance
Excellent (PREN ~ 34–38)
Good (PREN ~ 28–32)
Chloride Tolerance
High-concentration media
Moderate-concentration media
Cost
10–15% higher than 316L
Standard austenitic grade
Manufacturing and Quality Control
Welding: Gas Tungsten Arc Welding (GTAW) is preferred; use 317L filler metal to maintain corrosion resistance.
Heat Treatment: Solution annealing at 1010–1120°C followed by water quenching to homogenize the structure.
Testing: Commonly subjected to ASTM A923 testing for intergranular corrosion and ferritescope analysis to ensure a fully austenitic matrix.
Standards and Global Compliance
ASTM A240 (Type 317L)
EN 10088-2 (1.4438)
JIS G4303 (SUS317L)
ASME SA-240 for pressure vessel applications
317L’s combination of high molybdenum, low carbon, and austenitic stability makes it a go-to material for industries where failure due to corrosion is not an option—from deep-sea exploration to high-purity chemical processing.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Distributor/Wholesaler,Exporter
Total Annual:
>1000000
Employee Number:
>100
Ecer Certification：
Verified Supplier
Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative... Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative...
