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ASTM A312 TP316L (UNS S31603) Stainless Steel Seamless Pipe for Petrochemical
ASTM A312 TP316L (UNS S31603) is a low-carbon austenitic stainless steel seamless pipe designed for high corrosion resistance and high-temperature service in petrochemical, chemical processing, oil & gas, and other demanding industries. It offers superior pitting and crevice corrosion resistance compared to standard 316 stainless steel due to its reduced carbon content (≤0.03%), minimizing carbide precipitation during welding and thermal cycling.
1.Chemical & Mechanical Properties
| ASTM A312 TP316L Chemical Composition (%) |
| C |
Mn
|
P |
S |
Si
|
Cr |
Ni |
Mo |
N |
| ≤0.03% |
≤2.00% |
≤0.045% |
≤0.030% |
≤0.75% |
16.0%~18.0% |
10.0%~14.0% |
2.00%~3.00% |
≤0.1% |
Mechanical Properties
| Property |
Standard Value (Annealed) |
| Tensile Strength |
≥485 MPa |
| Yield Strength |
≥170 MPa |
| Elongation |
≥40% |
| Hardness |
≤217 HB (Brinell) |
2. Key Adventages
- Superior Corrosion Resistance
Resistant to chlorides & acids: Molybdenum (2-3%) enhances resistance to chlorides, seawater, sulfuric/phosphoric acids, ideal for marine/chemical industries.
Low-carbon anti-sensitization: Carbon ≤0.03% prevents intergranular corrosion during welding/thermal cycles.
-
High-Temperature & Pressure Performance
High-temperature stability: Continuous service up to 925°C (intermittent 870°C), suitable for heat exchangers/boilers.
Seamless design: No welded joints, higher pressure tolerance (ASME B31.3 compliant).
-
Excellent Weldability & Fabrication
No post-weld treatment: Low carbon minimizes carbide precipitation, enabling direct welding.
Easy fabrication: Austenitic structure allows cold bending/flaring.
3. Key Applications
Refinery piping systems: Transporting crude oil, refined products, and corrosive media (e.g., sulfides, acidic gases).
Heat exchangers & reactors: High-temperature/pressure heat transfer components.
Catalytic cracking units: Resistant to high-temperature sulfur corrosion and hydrogen embrittlement.
Acid/alkali transfer pipelines: For sulfuric, hydrochloric, and phosphoric acids.
Solvent production equipment: Resistant to organic solvents (e.g., methanol, ethanol).
Polymer production: Resists chloride-induced stress corrosion cracking (SCC).
Subsea pipelines: Resistant to seawater corrosion and microbiologically influenced corrosion (MIC).
LNG equipment: Maintains toughness in cryogenic conditions (-196°C).
Offshore platform components: Load-bearing parts in high-salinity environments.
Sanitary piping: Contamination-free transfer of high-purity fluids (FDA compliant).
Bioreactors: 316L material withstands clean-in-place/sterilize-in-place (CIP/SIP).
| Comparison Item |
TP316L (UNS S31603) |
TP316 (UNS S31600) |
| Carbon Content |
≤0.03%
(Ultra-low carbon, superior intergranular corrosion resistance after welding)
|
≤0.08%
(Standard carbon content, may sensitize after welding/high temperatures)
|
| Corrosion Resistance |
Excellent
(Low carbon minimizes carbide precipitation, superior pitting/crevice corrosion resistance)
|
Good
(But may lose corrosion resistance due to carbide precipitation in harsh conditions)
|
| Weldability |
No post-weld annealing required (Cost-effective for welded structures) |
May require post-weld heat treatment
(To prevent intergranular corrosion)
|
| High-Temp Performance |
Suitable for continuous service up to 925°C
(Reduced chromium carbide formation)
|
Suitable for ≤870°C
(Long-term high temp may cause weakening)
|
| Mechanical Strength |
Tensile: ≥485 MPa, Yield: ≥170 MPa (Slightly lower than TP316) |
Tensile: ≥515 MPa, Yield: ≥205 MPa (Higher strength) |
| Primary Applications |
Chemical/offshore/nuclear
(Harsh corrosive environments)
|
General industry/food processing (Moderate conditions) |
| Cost |
Slightly higher
(Due to low-carbon control process)
|
Slightly more economical
(Standard composition)
|
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