Sihe Steel
Sihe Steel
Engineered to conform strictly with international standards: GB, ASTM, ASME, JIS, and EN.
Grade 321 (UNS S32100) is an austenitic stainless steel stabilized with titanium (Ti). It is engineered for industrial environments exposed to high temperatures within the critical carbide precipitation range of 800°F (427°C) to 1500°F (816°C). Under standard conditions, non-stabilized austenitic steels (such as Grade 304) suffer from sensitization, where chromium carbides precipitate at the grain boundaries, depleting chromium and inducing rapid intergranular corrosion (IGC).
By alloying with titanium, which has a higher chemical affinity for carbon than chromium, titanium carbides (TiC) precipitate preferentially. This leaves the chromium uniformly distributed throughout the metallic matrix, preserving its corrosion resistance and mechanical integrity in severe thermal operations.
| Alloy Grade | Carbon (C) | Chromium (Cr) | Nickel (Ni) | Titanium (Ti) | Manganese (Mn) | Silicon (Si) | Phosphorus (P) & Sulfur (S) |
|---|---|---|---|---|---|---|---|
| 321 (UNS S32100) | ≤ 0.08% | 17.0 - 19.0% | 9.0 - 12.0% | 5 × (C+N) min to 0.70% max | ≤ 2.0% | ≤ 0.75% | P ≤ 0.045%, S ≤ 0.030% |
| 321H (UNS S32109) | 0.04 - 0.10% | 17.0 - 19.0% | 9.0 - 12.0% | 4 × (C+N) min to 0.70% max | ≤ 2.0% | ≤ 0.75% | P ≤ 0.045%, S ≤ 0.030% |
Equipped with 6 advanced production lines, delivering high-precision metallurgical solutions worldwide.
Operating state-of-the-art cold-drawing, precision-straightening, and automatic continuous orbital welding machinery optimized for complex geometries.
Utilizing an online bright hydrogen annealing furnace to treat stainless steel coils at high temperatures without creating surface oxides.
100% verification including hydrostatic, air tightness, flattening, mechanical tensile testing, and hardness measurements.
Sourcing 321 stainless steel pipes from our factory in Liaocheng, China, grants global buyers distinct advantages in material quality, volume scalability, and cost optimization. Our fully integrated production model streamlines raw material sourcing from tier-1 steel mills, such as TISCO and Baosteel, and processes it into finished precision tubing within a single, quality-controlled facility.
We reduce manufacturing overhead by utilizing highly efficient, high-throughput automated lines. Our raw material reserves ensure stable prices even during volatile nickel, chromium, and titanium market fluctuations. By selecting Liaocheng Sihe, international purchasers bypass intermediate brokers, accessing direct-to-factory prices coupled with verified metallurgical trace documentation.
Liaocheng Sihe's products perform under extreme pressure, severe chemical exposures, and high temperatures.
Custom engineering tailored for unique system layout specifications.
At Liaocheng Sihe, we offer extensive post-production processing services, ensuring that our products integrate directly into your assembly line. Our capabilities range from custom-configured multi-axis bending to surface electropolishing for pharmaceutical installations. We maintain tight dimensional tolerances, clean interior surfaces, and high mechanical consistency.
Verified manufacturing processes, traceable materials, and international accreditation.
Browse our wide selection of high-alloy coiled tubing, precision capillary lines, and plate solutions.
Duplex 2205 is a nitrogen-enhanced steel offering high mechanical strength and pitting resistance.
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1/2" coiled tubing refers to a high-pressure coil used in downhole chemical injection.
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Providing elevated resistance to carburization and high-temperature sulfur oxidation.
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Engineered with narrow internal diameter clearances for fluid chromatography instrumentation.
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Finished with fine mechanical grit or electropolishing to prevent bacterial colonization.
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Combines the properties of both ferritic and austenitic steels to combat chloride SCC.
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Nickel-based superalloy engineered for outstanding strength from cryogenic up to 1800°F.
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Low-carbon marine grade designed for salt-water and chemical transfer piping systems.
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Automated longitudinally welded pipes with 100% radiographic weld seam evaluation.
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Premium finish designed for architectural design, automotive, and domestic appliances.
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Specially engineered hangers for elevated temperature boiler and furnace suspensions.
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High-pressure capillary tubing configured for oil exploration control umbilicals.
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Continuous spooled tubing lines optimized for deep sea hydraulic safety valve operations.
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Pre-bent double-walled spiral configurations maximizing heat transfer coefficient.
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High nickel and chromium composition presenting outstanding creep strength at 1000°C.
View DetailsDetailed insights regarding chemical compositions, order fulfillment, testing, and shipping guidelines.
Our prices depend on steel alloy markets, raw material availability, and order volumes. We will send an updated price list once you contact us with your specific size and grade parameters.
Yes, international orders require an ongoing MOQ. If you wish to source smaller, specialized trial batches, please contact our export sales desk for customized shipping options.
Yes. We provide complete mill test certificates in accordance with EN 10204 3.1 or 3.2, Certificates of Analysis, Certificates of Conformance, Origin certification, and cargo export insurance.
For standard samples, the lead time is approximately 7 days. For volume manufacturing runs, the lead time is 20 to 30 days following deposit confirmation and technical drawing approval.
We accept wire transfer (T/T), Western Union, and PayPal: a 30% advance deposit is required, with the remaining 70% balance paid against the copy of the Bill of Lading (B/L).
We warranty our material properties, chemical composition, and welding craft. Our corporate culture is focused on resolving any client material concerns to ensure performance integrity.
Yes. We use heavy-duty export packaging, including wooden crates, waterproof wrapping, and core supports to prevent damage. We also use specialized packaging for maritime transport.
Shipping fees depend on the selected transport method. Ocean freight is the most cost-effective solution for large-volume orders, while air express is faster but costlier. Contact us with details of your delivery port and cargo volume for an accurate freight estimate.
Grade 321 contains titanium to prevent sensitization (chromium carbide precipitation) when working within the 800°F to 1500°F (427°C–816°C) range. Grade 304 and 316 are prone to intergranular corrosion in this range, making 321 the preferred choice for high-temperature service.
We manufacture continuous seamless coiled tubing spools up to 32,800 feet (10,000 meters) without orbital welds. This is ideal for subsea oil and gas umbilicals, chemical injection lines, and high-pressure downhole control lines.
Select from our certified high-performance alloy tubes designed for demanding industrial operations.
