ASTM A403/ASME SA403 WP316/WP316L Stainless Steel Seamless Buttwelded Fitting 90 Degree Elbow B16.9
ASTM A403/ASME SA403 WP316L stainless steel elbow is a widely used pipe fitting in industrial piping systems. Its manufacturing and performance follow the ASTM A403 standard (standard specification for forged austenitic stainless steel pipe fittings), and the material grade is WP316L.
ASTM A403 Stainless Steel Buttwelded Fitting Classes for WP Grades
| Class | Construction | Nondestructive Examination |
| S | Seamless | None |
| W | Welded | Radiography or Ultrasonic |
| WX | Welded | Radiography |
| WU | Welded | Ultrasonic |
The chemical composition of 316L is mainly composed of 16-18% chromium (Cr), 10-14% nickel (Ni), 2-3% molybdenum (Mo), carbon (C) ≤ 0.03%, and the rest is iron (Fe) and a small amount of other elements (such as manganese, silicon, etc.). The low-carbon design of 316L can reduce carbide precipitation during use and enhance the product's resistance to intergranular corrosion.
316L is a low-carbon version of 316 stainless steel that performs outstandingly in high temperature, acidic, and chloride environments. It is more suitable for corrosive environments such as chemical, marine, and food processing. At the same time, due to its significant resistance to pitting and crevice corrosion, it is suitable for use in media containing chloride ions (such as seawater).
ASTM A403 Stainless Steel Buttwelded Fitting Chemical Requirements
| Grade | UNS | C | Mn | Ph | S | Si | Ni | Cr | Mo |
| WP316 | S31600 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 10.0-14.0 | 16.0-18.0 | 2.00-3.00 |
| WP316L | S31603 | 0.030 | 2.00 | 0.045 | 0.030 | 1.00 | 10.0-14.0 | 16.0-18.0 | 2.00-3.00 |
| WP316H | S31609 | 0.04-0.10 | 2.00 | 0.045 | 0.030 | 1.00 | 10.0-14.0 | 16.0-18.0 | 2.00-3.00 |
ASTM A403 Stainless Steel Buttwelded Fitting Heat Treatment and Tensile Treatment
| Grade | Solution Anneal Temperature, min °F [°C]B | Quench Media | Yield Strength, min, ksi [MPa] | Tensile Strength, min, ksi [MPa] |
| WP316 | 1900 [1040] | water or other rapid cool | 30 [205] | 75 [515] |
| WP316L | 1900 [1040] | water or other rapid cool | 30 [205] | 75 [515] |
| WP316H | 1900 [1040] | water or other rapid cool | 30 [205] | 75 [515] |
ASTM A403 Stainless Steel Buttwelded Fitting Testing and Quality Control
- Chemical analysis: Ensure that the material composition meets the requirements of ASTM A240 (Stainless Steel Plate/Strip Standard).
- Mechanical performance testing: Verify parameters such as tensile strength and yield strength.
- Non destructive testing (NDT): According to standards and customer requirements, it may include radiographic testing (RT) or liquid penetrant testing (PT), etc., used to detect internal or surface defects.
- Hydrostatic test: Conduct a hydrostatic test according to standard requirements to ensure sealing.
- Certification: Material Test Reports (MTC) and Compliance Certificates (such as PED 2014/68/EU for the European market) are typically provided.
ASTM A403 Stainless Steel Buttwelded Fitting Application
- Chemical and Petrochemical: Pipelines used in chemical and petrochemical systems to transport corrosive media such as acids, alkalis, and solvents.
- Ocean engineering: Due to its excellent resistance to alkaline solution corrosion, it can be widely used in seawater desalination and ship pipeline systems.
- Food and pharmaceuticals: After additional polishing treatment, it can be applied to sanitary grade piping systems.
- Energy industry: Due to its high stability, it can be widely used in low-temperature and high-pressure environments in nuclear power and LNG facilities.
- Environmental protection equipment: flue gas desulfurization (FGD) system.
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ASTM A403 / ASME SA403 WP316 / WP316L Stainless Steel Seamless Buttwelded Fitting 90 Degree Elbow B16.9 Images
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