304 - 316 Stainless Steel Seamless Pipes
304 & 316 Stainless Steel Seamless Tubes - Engineered for Extreme Reliability
Stainless steel seamless pipes serve as the lifelines of modern industry. Our304and316austenitic stainless steel seamless tubes are manufactured to deliver exceptional corrosion resistance, high-temperature stability, and precise dimensional consistency. Whether for offshore oil platforms or aseptic pharmaceutical lines, we provide tailored tubing solutions that ensure operational integrity and fluid purity.
Material Deep Dive: Beyond the Grade Numbers
1. 304 Stainless Steel (UNS S30400) - Versatile Workhorse
Chemical Highlights: Approx. 18% Chromium and 8% Nickel. Offers excellent general corrosion resistance and outstanding formability.
Performance Focus: Suitable for environments without severe chloride exposure, offering reliable intergranular corrosion resistance.
Service Temperature: Maintains oxidation resistance for continuous service up to 800°C.
2. 316 Stainless Steel (UNS S31600) - The Chlorine Fighter
Chemical Highlights: Contains 2.0%-3.0% Molybdenum and higher Nickel content.
Performance Focus: Molybdenum dramatically enhances resistance to pitting and crevice corrosion, especially against chlorides, sulfates, and dilute acids.
Service Temperature: Superior creep rupture strength at elevated temperatures compared to 304.
|
Mechanical Property |
Grade 304 |
Grade 316 |
|---|---|---|
|
Tensile Strength (MPa) |
≥ 520 |
≥ 520 |
|
Yield Strength (MPa) |
≥ 205 |
≥ 210 |
|
Elongation (%) |
≥ 40 |
≥ 35 |
|
Hardness (HB) |
≤ 187 |
≤ 187 |
|
PREN Value |
-18-19 |
-24-26 |
Advanced Manufacturing Process
We utilize a strict"Piercing → Multi-pass Cold Drawing / Cold Rolling → Intermediate Solution Annealing → Straightening → NDT"production flow.
Solution Annealing: Performed in controlled atmosphere furnaces to eliminate work hardening and restore uniform austenitic structure. Grain size is maintained at Grade 7 or finer.
Precision Tolerances: High-precision rolling mills ensure OD tolerances within ±0.05mm, with minimal wall thickness deviation, facilitating easy bending and coiling.
Smooth ID Surface: Through pickling or bright annealing, we achieve a Ra ≤ 0.4μm inner surface, reducing friction loss and preventing bacterial growth.
Industry-Specific Applications
|
Industry |
Applications |
Recommended Grade |
|---|---|---|
|
Oil & Gas |
Downhole instrumentation, subsea pipelines, refinery heat exchangers |
316 / 316L |
|
Food & Beverage |
Beer brewing, dairy pasteurization, potable water lines |
304 (Polished ID) |
|
Bio-Pharma |
WFI (Water for Injection) loops, fermenter cooling coils |
316L (Low Carbon) |
|
Marine Engineering |
Ballast water systems, offshore firefighting pipes, desalination |
316 / Duplex alternatives |
|
Semiconductor |
High-purity gas (N2) & chemical distribution (EP grade) |
316L (Electropolished) |
|
Architecture |
Bridge railings, structural columns, curtain wall frames |
304 / 304L |
Export Packaging & Logistics
Standard Bundling: Hexagonal steel-framed bundles wrapped in waterproof fabric.
End Protection: Plastic caps on both ends to prevent ingress of debris.
Wooden Cases: Fumigation-free plywood cases for polished or small-diameter coiled tubes.
Lead Time: 7-15 working days for standard sizes; custom orders negotiated based on complexity.
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