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| After-sales Service: | Cutting |
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| Warranty: | / |
| Type: | Seamless |
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| Available Grades | 200 Series: 201,202 |
| 300 Series: 304, 304L, 304H, 309, 309S, 310, 310S, 316, 316L, 317, 317L, 321, 321H, 347, 347H | |
| 400 Series: 409, 410S, 416, 420, 430, 439, 440, 444, 446 | |
| Duplex and Others: 2205, 2507, S31803, S32205, S32750, S32760, 253MA, 254SMO, 904L etc |
| Property | 316 Stainless Steel Pipe | 304 Stainless Steel Pipe |
|---|---|---|
| Molybdenum (Mo) | 2-3% (critical for corrosion) | None |
| Corrosion Resistance | Superior (chlorides, acids) | Good (mild environments) |
| Cost | More expensive (~20-30% higher) | Lower cost |
| Temperature Limit | Higher (~1600°F vs. ~1500°F) | Slightly lower |
Note: For welding, 316L is preferred to avoid carbide precipitation.
ASTM A312: Seamless/welded pipes for general corrosion service.
ASTM A358: Welded pipes for high-corrosion applications.
ASTM A790: Covers duplex stainless steels (e.g., 316L).
EN 1.4401 (316) / 1.4404 (316L): European equivalents.
| Type | Common Sizes (mm/inch) | Wall Thickness (mm/inch) |
|---|---|---|
| Small Diameter | 6mm (1/4") - 50mm (2") | 0.5mm (0.02") - 3mm (0.12") |
| Medium Diameter | 60mm (2.5") - 150mm (6") | 2mm (0.08") - 5mm (0.2") |
| Large Diameter | 200mm (8") - 600mm (24") | 4mm (0.16") - 12mm (0.47") |
| Schedule (SCH) | Approx. Wall Thickness (mm/inch for DN50/NPS 2") |
|---|---|
| SCH 5S | 1.65mm (0.065") |
| SCH 10S | 2.11mm (0.083") |
| SCH 40S | 3.68mm (0.145") |
| SCH 80S | 5.56mm (0.219") |
| NPS (Inch) | DN (Metric) | Actual OD (mm) |
|---|---|---|
| 1/2" | DN15 | 21.3mm |
| 3/4" | DN20 | 26.7mm |
| 1" | DN25 | 33.4mm |
| 2" | DN50 | 60.3mm |
| 4" | DN100 | 114.3mm |
| Finish | Process | Appearance | Roughness (Ra) | Corrosion Resistance | Cost | Typical Applications |
|---|---|---|---|---|---|---|
| 2B | Cold rolled + bright annealed + light polish | Smooth, semi-reflective | ≤0.3μm | Good | $$ | Food equipment, chemical pipes, general industry |
| BA | Bright annealed in hydrogen/vacuum | Highly reflective, near-mirror | ≤0.2μm | Excellent | $$$ | Medical, semiconductor, high-end decor |
| No.1 | Hot rolled + pickled | Rough, matte with mill marks | 3.2-6.3μm | Fair | $ | Structural, boilers, industrial pipes |
| HL (Hairline) | Mechanical brushing | Unidirectional satin lines | 0.4-1.0μm | Good | $$ | Elevators, appliances, architecture |
| No.4 | Uniform abrasive grinding | Consistent satin matte | 0.5-1.5μm | Good | $$ | Kitchen equipment, decorative panels |
| No.8 | Progressive polishing | Perfect mirror | ≤0.1μm | Best | $$$$ | Luxury decor, optical equipment |
| Electropolished | Electrochemical polishing | Ultra-smooth, bright | ≤0.05μm | Superior | $$$$$ | Pharma, semiconductor, ultra-clean systems |
316 pipes are used in aggressive environments where 304 would fail:
Marine/Offshore: Shipbuilding, seawater pipelines.
Chemical Processing: Sulfuric/phosphoric acid handling.
Oil & Gas: Downhole equipment, refinery piping.
Medical/Surgical: Implants, sterile tubing.
Food Industry: Brine, vinegar, or high-salt environments.
Pharmaceutical: High-purity fluid systems.
Q: When to use 316L vs. 316?
A: 316L for welding or extreme corrosion (e.g., welded pipelines). 316 for non-welded, high-strength needs.
Q: Can 316 stainless steel rust?
A: Rarely, but prolonged exposure to extreme chlorides (e.g., undiluted bleach) may cause pitting.
Q: How to identify 316 pipes?
A: Check markings ("316"/"S31600") or Mill Test Certificates (MTC). A molybdenum test (e.g., XRF analyzer) can confirm.
For projects involving saltwater, acids, or high temperatures, 316 is the gold standard. Always specify ASTM/EN standards and surface finishes based on application needs.
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