316 / 316L Stainless Steel Pipe
316 / 316L Stainless Steel Pipe is a high-performance austenitic stainless steel widely known as “Marine Grade” due to its exceptional resistance to chloride-induced corrosion.
Heat Treatment of 316 / 316L Stainless Steel Pipe
Solution Annealing
- Temperature:
Heat to 1900°F – 2150°F (1040°C – 1175°C). - Hold time:
Typically 1 hour per inch of thickness. - Cooling:
Must be rapidly quenched (water or air cooling) to prevent carbide regrowth.For optimum corrosion resistance,the metal should be cooled to a “black-hot” state within 3 minutes.
Stress Relieving
- For 316L:
Can be heat treated within the range of 850°F–1100°F (454°C–593°C) with extremely low sensitization risk (i.e., minimal susceptibility to corrosion-induced embrittlement). - For standard 316:
Stress relief is typically performed at lower temperatures,not exceeding 750°F (400°C),to prevent carbide precipitation. - Risk:
Avoid prolonged exposure to temperatures between 900°F–1600°F (538°C–871°C),as this may induce σ-phase formation,causing embrittlement of the steel.
Hot Working
- Forging Temperature:
2100°F – 2300°F (1149°C – 1260°C). - Note:
Forging temperature must not fall below 1700°F (927°C).Full solution annealing is mandatory after hot working to restore material properties.
Bright Annealing
A specialized process conducted in a hydrogen-rich atmosphere to prevent oxidation,ultimately forming a smooth,reflective surface that eliminates the need for subsequent acid washing or polishing.
| Treatment Type | Temperature Range | Cooling Method | Purpose |
|---|---|---|---|
| Solution Anneal | 1040°C – 1175°C | Rapid Quench (Water/Air) | Maximize corrosion resistance & soften |
| Stress Relieving | 450°C – 600°C (316L) | Air Cool | Dimensional stability & SCC prevention |
| Hot Working | 1150°C – 1260°C | Follow with Anneal | Shaping/Forging |
316 / 316L Stainless Steel Pipe Chemical Composition
| Element (%) | 316 (S31600) | 316L (S31603) |
|---|---|---|
| C | 0.08% Max | 0.03% Max |
| Cr | 16.0 – 18.0 | 16.0 – 18.0 |
| Ni | 10.0 – 14.0 | 10.0 – 14.0 |
| Mo | 2.00 – 3.00 | 2.00 – 3.00 |
| Mn | 2.00 Max | 2.00 Max |
| Si | 0.75 Max | 0.75 Max |
| P | 0.045 Max | 0.045 Max |
| S | 0.03 Max | 0.03 Max |
| N | 0.10 Max | 0.10 Max |
| Fe | Balance | Balance |
316 / 316L Stainless Steel Pipe Mechanical Properties
| Property | 316 (S31600) | 316L (S31603) |
|---|---|---|
| Tensile Strength, min. | 75 ksi (515 MPa) | 70 ksi (485 MPa) |
| Yield Strength (0.2% Offset), min. | 30 ksi (205 MPa) | 25 ksi (170 MPa) |
| Elongation (in 2 in. or 50mm), min. | 35% – 40% | 35% – 40% |
| Hardness, max. | 95 HRB (217 HBW) | 95 HRB (217 HBW) |
Kaysuns offers stainless steel pipes that simultaneously meet the mechanical properties of 316 and the low-carbon requirements of 316L. These products carry dual 316/316L certification.Please feel free to contact us if you have any needs.
What We Do
- Plate
- Sheet
- Forgings
- Round Bar
- Flange
- Pipes
- Fittings
- Customized
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Manufacturing Standards for 316 / 316L Stainless Steel Pipe
- ASTM A312 / ASME SA312:
The most versatile standard covering seamless, welded, and heavily cold-worked austenitic stainless steel pipes for high-temperature and general corrosion environments. - ASTM A358 / ASME SA358:
Applicable to electric-fusion welded stainless steel pipes, typically used for large-diameter heavy-duty pipelines requiring X-ray non-destructive testing. - ASTM A269:
Suitable for general-purpose instrumentation or heat exchange tubes, with higher dimensional accuracy and surface quality requirements than A312. - ASTM A213 / ASME SA213:
Specifies seamless ferritic and austenitic alloy steel tubes for boilers, superheaters, and heat exchangers. - ASTM A249 / ASME SA249:
Standard for welded boiler and heat exchanger tubes. - ASME B36.19M:
Dimension standard specifically for stainless steel tubes, defining the relationship between Schedule (e.g., 5S, 10S, 40S, 80S) and nominal diameter (NPS). - ASME B36.10M:
Although the primary standard for carbon steel tubes, it is also referenced for certain thick-walled stainless steel tubes. - ASTM A270:
Specifically for sanitary tubing in food, dairy, and pharmaceutical industries, with mandatory requirements for internal surface roughness (Ra value).
Manufacturing and Supplying Capacity
| Product | Stainless Steel Pipes and tubes |
| Grade | 316 | 1.4401 ，316L | 1.4404 |
| Dimension | 1/2” ~ 24” for smls, 6” ~ 104” for EFW pipe The dimensions of stainless steel pipes comply with ASME B36.19/B36.10 standards. |
| Schedule | SCH10S, SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
| Type | Seamless / Welded |
| Manfaucturing Craft | Cold Drawn,Cold Rolled (ERW/EFW for welded) |
| Pipe End | Plain End, Beveled End, Treaded |
| Delivery Condtions | Solution Annealing, Bright Annealing |
Features
- Pitting Resistance
- Excellent Weldability
- Thermal Versatility
- Non-Magnetic
- Hygienic & Biocompatible
Applications
- Marine Engineering
- Chemical & Petrochemical Processing
- Pharmaceutical & Biotech
- Food & Beverage
- Medical Devices & Implants
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Get In Touch
- RM901 No.22 Tangjiaqiao Road Wenzhou China
- +86 577 8551 1171
- [email protected]
- https://www.kaysuns.com/
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