Sihe Steel
Sihe Steel
Explore our industrial-grade range of seamless coiled pipes, capillary tubes, and standard-compliant alloy components.
Demands for metallurgical integrity, high corrosion resistance, and flawless pressure containment are shaping modern material engineering.
Seamless stainless steel tubing represents the lifeblood of advanced industrial process engineering. Unlike welded counterparts, seamless tubing boasts a monolithic structure that completely eliminates the heat-affected zone (HAZ), reducing the potential for localized galvanic corrosion and physical deformation under extreme operational pressures.
Globally, the shift toward deepwater exploration, ultra-high purity semiconductor processing, and high-temperature petrochemical refining has intensified the reliance on premium materials like 316L, Duplex 2205, and Inconel 625. Modern subsea operations demand continuous hydraulic line coils that can withstand thousands of meters of seawater pressure without a single weld seam.
Internationally recognized frameworks such as ASTM A269, A213, ASME SB423, and EN 10216-5 dictate chemical composition, tensile strengths, and non-destructive testing requirements. In highly critical industries, such as pharmaceutical engineering and aerospace instrumentation, compliance is not negotiable. Every tubing production run must offer transparent mill trace records and absolute metallurgical homogeneity to safeguard human life and corporate assets.
Established as a global production hub in China, Liaocheng Sihe Stainless Steel Material LTD operates six highly automated production lines configured to manufacture seamless tubing that complies strictly with international metrics.
With over a decade of technological refinement, our factory introduces advanced, online bright annealing systems that homogenize crystal grain boundaries, guaranteeing structural softness and excellent ductility for bending and onsite installation. We specialize in producing custom lengths up to 32,800 feet (10,000 meters) without joints, which serves as a reliable asset for offshore umbilical lines and subsea control systems.
At our Liaocheng manufacturing plant, quality assurance processes dictate every production phase. The integration of continuous cold drawing, multi-roll cold reduction, and inline bright annealing allows us to yield uniform surface conditions and tight dimensional tolerances down to +/- 0.05 mm.
By conducting continuous internal pressure tests, we verify the burst thresholds of our tubing, ensuring safety factors that meet or exceed standard requirements. Our seamless tubing has been selected by distributors and industrial end-users across more than 30 countries, including the US, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe.
Our long-term R&D initiatives focus on manufacturing efficiency, chemical stability, and structural strength under high pressure.
Implementation of real-time optical tracking inside the induction annealing chamber. This guarantees uniform microstructures and reduces oxidation to absolute zero.
Scaling up production of electro-polished (EP) seamless tubes for sub-14nm semiconductor process gas distribution manifolds.
Expanding metallurgy to optimize titanium-stabilized and custom high-entropy alloys suitable for deep-sea geothermal fields and hydrogen refueling systems.
Review standard physical properties, dimensional thresholds, and alloy classifications manufactured by Liaocheng Sihe.
| Alloy Family | Common Designation / UNS | Outer Diameter (OD) | Wall Thickness (WT) | Key Standards | Primary Industrial Utility |
|---|---|---|---|---|---|
| Austenitic Steel | 304/304L (UNS S30403) | 0.125" to 1" (3.175 - 25.4mm) | Up to 0.165" (3.0mm) | ASTM A269, A213, EN 10216-5 | General instrumentation, chemical plants, HVAC systems |
| Austenitic (Mo-Alloyed) | 316L (UNS S31603) | 0.125" to 1" (3.175 - 25.4mm) | Up to 0.165" (3.0mm) | ASTM A269, JIS G3459, EN 10216-5 | Marine hydraulics, pharmaceutical piping, instrumentation |
| Duplex Stainless | Duplex 2205 (UNS S32205) | 0.250" to 1" (6.35 - 25.4mm) | Up to 0.120" (3.0mm) | ASTM A789, ASME SA789 | Oil & gas exploration, seawater coolers, chemical tankers |
| Super Duplex | Super Duplex 2507 (UNS S32750) | 0.250" to 1" (6.35 - 25.4mm) | Up to 0.120" (3.0mm) | ASTM A789, ASME SA789 | Desalination plants, ultra-deep offshore wells, acidic environments |
| Nickel Superalloy | Inconel 625 (UNS N06625) | 0.125" to 0.75" (3.175 - 19.05mm) | Up to 0.095" (2.41mm) | ASTM B444, ASME SB444 | Aerospace manifolds, geothermal wells, marine riser lines |
| Nickel-Iron-Chromium | Incoloy 825 (UNS N08825) | 0.125" to 0.75" (3.175 - 19.05mm) | Up to 0.095" (2.41mm) | ASTM B423, ASME SB423 | Sour gas production wells, chemical waste processing |
From extreme offshore deepwater fields to micro-scale laboratory systems, our seamless tubing provides reliable structural integrity.
In subsea operations, control fluid pressure must travel thousands of meters through deep water. Our continuous seamless coiled tubing ensures high yield strength and corrosion resistance against chloride attack under extreme pressures.
For semiconductor processing, internal pipe surfaces must have sub-micron roughness. Our high-precision 304 and 316L capillary tubes prevent gaseous contaminants from entering cleanrooms, helping protect yield margins.
In sanitizable facilities, clean-in-place (CIP) protocols rely on smooth surfaces to prevent biofilm formation. Our electrochemical-grade seamless tubes help maintain hygienic processing conditions during bulk medicine synthesis.
Under heavy engine vibrations and high operating temperatures, fuel injection and Exhaust Gas Recirculation (EGR) systems rely on robust alloy configurations. Our high-pressure seamless tubing resists thermal cyclic fatigue under load.
Liquefied Natural Gas (LNG) processing at sub-zero temperatures requires ductile pipe walls. Our stabilized austenitic and nickel superalloys retain high physical strength and impact toughness down to -196 degrees Celsius.
How our localized steel cluster and manufacturing footprint maintain reliable global delivery times.
Our relationships with primary state-owned steel mills in China ensure stable access to high-purity billets, insulating our clients from global material shortages and cost fluctuations.
By operating six specialized lines, we maintain production flexibility. This allows us to handle both high-volume standardized runs and custom alloy prototypes concurrently without scheduling delays.
Located near major shipping gateways, our logistics partners ensure prompt containerized deliveries. We coordinate land transport to reduce loading delays and maintain structural integrity during transit.
Our facilities are audited to comply with international quality management systems and pressure equipment directives.
Our fabrication division offers secondary processing to meet specialized system designs.
We work with materials like 304, 316L, and Duplex 2205, adjusting outside diameters from 6.35mm to 19mm to suit specific design requirements.
Our team fabricates single-piece multi-bends, continuous spirals, and high-tolerance coils optimized for high-pressure heat exchangers.
Using laser and high-speed mechanical cutting tools, we deliver clean cut faces with tight length tolerances.
We apply mechanical polishing, electro-polishing, and pickling to yield smooth inside and outside surfaces that meet high-purity standards.
Our end-flanging processes create tight seals for connections in automotive exhaust layouts and high-pressure chemical lines.
Our products are utilized across specialized industrial sectors worldwide.
Get professional, authoritative responses regarding procurement, engineering standards, delivery times, and testing processes.
Our pricing model is tied to international alloy raw material indexes (such as LME nickel and molybdenum prices) and specific order volumes. Once you contact our team with your required alloy grades, dimensions, wall thicknesses, and total volumes, we will provide a detailed quote sheet.
Yes, we require minimum order quantities for international shipments to maintain processing efficiency. For specialized alloys or customized sizes, the MOQ varies based on size and manufacturing run. Please check with our sales office for specific details.
Yes, we provide standard documentation including Certificates of Analysis/Conformance (Mill Test Certificates to EN 10204 3.1), Third-Party Inspection Reports (SGS/TUV), Country of Origin declarations, and related customs export paperwork.
Standard lead times are about 7 days for stocked samples and 20 to 30 days for mass production orders, beginning upon receipt of deposit and final approval of the design profile. We will coordinate with your project timeline to meet scheduled deadlines.
Our standard payment term is a 30% deposit in advance via bank wire transfer (T/T), with the remaining 70% balance paid against the copy of the Bill of Lading (B/L). We also accept Western Union and PayPal for sample orders.
We guarantee that all materials match the physical and chemical limits specified in the purchase agreement. If any tube fails onsite testing due to dimensional or chemical deviations, we will replace or refund the affected batch.
Coiled and capillary tubes are packaged on wooden reels or in reinforced steel frames with outer shrink wrap to protect against seawater corrosion and mechanical impacts during transport. End caps are fitted to prevent debris entry.
Shipping charges depend on the selected shipment method (CIF, FOB, EXW, DDP) and transit routes. Ocean freight is recommended for volume orders, while air freight or express is available for time-sensitive samples. We will calculate exact freight rates based on package weights and dimensions.
Verified historical production classifications and catalog items from Liaocheng Sihe.
2205 stainless steel is a duplex stainless steel containing austenitic and ferritic microstructures, designed to offer high yield strength and corrosion resistance...
1/2 stainless steel coiled tubing refers to a coil of stainless steel tubing designed for high-pressure control lines and instrumentation loops...
China 310 Steel Coil Tube Factories make high-temperature oxidation resistant stainless steel tubing capable of working at temperatures above 1000°C...
Complete your systems using our complementary line of certified stainless plates and capillary lines.
