Sihe Steel
Sihe Steel
Explore our certified product categories, engineered to meet the highest international standards. We supply premium tubes, pipes, and custom coils directly from our production lines.
As a foundational component of modern industrial engineering, 304 Stainless Steel (UNS S30400) represents the most versatile and widely implemented austenitic alloy in the world. Characterized by its optimum combination of chromium (minimum 18%) and nickel (minimum 8%), this chemical composition guarantees an exceptional austenitic structure that delivers superb weldability, formability, and resistance to aggressive environmental corrosion.
Under the strict guidelines of ASTM A240 / ASME SA240, 304 stainless steel sheets must maintain a precisely controlled chemical composition to prevent the formation of deleterious phases. Our manufacturing facilities strictly monitor raw melt chemistry, ensuring negligible carbon drift. This allows us to supply both standard 304 and 304L (UNS S30403) variants. The low carbon content (max 0.03%) of 304L prevents sensitization during welding, eliminating the risk of intergranular corrosion in high-temperature zones.
| Steel Type / Grade | C (%) | Mn (%) | P (%) | S (%) | Si (%) | Cr (%) | Ni (%) | N (%) |
|---|---|---|---|---|---|---|---|---|
| 304 (UNS S30400) | ≤ 0.08 | ≤ 2.00 | ≤ 0.045 | ≤ 0.030 | ≤ 0.75 | 18.0 - 20.0 | 8.0 - 10.5 | ≤ 0.10 |
| 304L (UNS S30403) | ≤ 0.03 | ≤ 2.00 | ≤ 0.045 | ≤ 0.030 | ≤ 0.75 | 18.0 - 20.0 | 8.0 - 12.0 | ≤ 0.10 |
| 316L (UNS S31603) | ≤ 0.03 | ≤ 2.00 | ≤ 0.045 | ≤ 0.030 | ≤ 0.75 | 16.0 - 18.0 | 10.0 - 14.0 | ≤ 0.10 |
Established with a commitment to high-precision steel processing, Liaocheng sihe stainless steel material LTD stands as a top-tier manufacturer and supplier of advanced stainless steel sheets, pipes, and coiled tubing. Based in China, our facility features six state-of-the-art production lines capable of maintaining continuous manufacturing quality and fast delivery.
Our company is a leading expert in the production of stainless steel coiled tubes, stainless steel polishing tubes, and seamless coiled tubing. Our operational procedures are certified under ISO 9001 and rigorously conform to global standards including GB, ASTM, ASME, JIS, and EN. Our material range spans across Austenitic series: 304/304L, 316L, 321, 317L, 309S, 310S, and specialty alloys like Incoloy 800/825, Inconel 625, Duplex 2205, and Super Duplex 2507.
We introduced first-class online bright annealing technology, allowing for continuous online softening of stainless steel pipes. This ensures an ultra-clean, scale-free surface and excellent ductility. Backed by ten years of manufacturing experience, our products are regularly exported to over 30 countries and regions, including the US, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe.
Production Facility Floor
Seamless Coiled Tubing Line
Stock Warehouse & Logistics
Our processing capabilities are designed to meet diverse customer specifications. Beyond standard sheet cutting and polishing, we offer advanced dimensional configurations for coiled tubing and heat exchanger components:
Our stainless steel sheets, plates, and tubes are engineered for challenging industrial settings. Below are the key sectors utilizing our materials:
Flexible Seamless Coil
Stainless Steel Tubing
China 310 Steel Coil Tube
Specialty Tubes
Industrial Stainless Sheet
Polished Plates
High Alloy Coil
Pressure Pipes
Exchanger Tube Bundles
Capillary Tubes
Coiled Capillaries
Precision Tubing
Duplex 2205 Coil
Our manufacturing operation is located in Liaocheng, Shandong Province, a major industrial hub for global steel production. This geographical positioning gives us direct access to key advantages:
We source high-grade chromium, nickel, and iron ore melts from leading local refineries. This integration reduces transportation time and buffers us from raw material volatility, allowing us to offer stable, competitive pricing.
Liaocheng Sihe maintains close logistics partnerships with major international shipping hubs like the Port of Qingdao and the Port of Tianjin. This ensures efficient transit, secure handling, and rapid shipping times to Europe, North America, and Southeast Asia.
Our quality assurance system tracks materials from melting to final packaging. Our testing protocol includes 100% hydrostatic testing, eddy current inspection, pneumatic tests, flattening/flaring tests, microstructural evaluation, and PMI (Positive Material Identification) testing.
ISO Quality System Certificate
Mill Test Certificate (EN 10204 3.1)
SGS Chemical Analysis Report
Bureau Veritas Product Approval
ASME Pressure Vessel Compliance
PED 2014/68/EU CE Certificate
NACE MR0175 Corrosion Test Report
ABS Steel Classification Certificate
Lloyd's Register Quality Assurance
TUV Rheinland Mill Certificate
DNV GL Material Approval
CCS Certification Document
Browse our full range of stainless steel capillary tubes, heat exchanger pipes, and customized alloys ready for international shipping.
