Sihe Steel
Sihe Steel
Explore our premium grade materials manufactured in strict compliance with international ASTM, ASME, DIN & JIS standards.
A comprehensive analysis of high-temperature ferritic alloys in dynamic fluid control, structural integrity, and thermal process applications.
The industrial demand for specialized metallurgical profiles that reconcile high-temperature corrosion resistance with cost-efficiency has positioned ASTM A269 Grade 409 Stainless Steel as a pivotal alloy choice. Historically optimized for automotive exhaust manifolds, grade 409 is a titanium-stabilized ferritic stainless steel offering exceptional thermal stability, oxidation resistance, and weldability. When formatted into continuous coiled tubing, these attributes support critical pathways for low-stress heating loops, process systems, and automotive heat exchangers.
ASTM A269 governs seamless and welded austenitic stainless steel tubing for general service; however, the adaptation of ferritic and super-ferritic structures (like Grade 409 / AISI 409) under similar precise drawing standards meets the intense pressure constraints of critical fluid conveyance systems. Under this framework, Liaocheng Sihe Stainless Steel Material LTD manufactures ultra-long continuous coiled tubes designed to withstand aggressive mechanical deformation and thermal cycling environments.
The defining feature of Grade 409 (UNS S40900) is its chemical formulation, which contains roughly 10.5% to 11.75% chromium. Crucially, the addition of Titanium (Ti) as a stabilizing agent serves to bind carbon and nitrogen molecules. This stabilization prevents sensitization—the precipitation of chromium carbides at grain boundaries when exposed to temperatures in the critical sensitizing range (427°C to 816°C). By avoiding sensitization, the alloy retains its localized mechanical properties and avoids intergranular cracking along welded lines.
| Alloy Standard | Chromium (Cr)% | Nickel (Ni)% | Titanium (Ti) Stabilization | Carbon (C) Max% | Yield Strength (MPa) | Max Temp (Oxidation) |
|---|---|---|---|---|---|---|
| ASTM A269 TP409 | 10.5 - 11.75 | 0.50 Max | 6x(C+N) Min to 0.75 Max | 0.08 | ≥ 170 | 675°C (1247°F) Continuous |
| ASTM A269 TP304 | 18.0 - 20.0 | 8.0 - 11.0 | N/A | 0.08 | ≥ 205 | 870°C (1600°F) Intermittent |
| ASTM A269 TP316L | 16.0 - 18.0 | 10.0 - 14.0 | N/A | 0.03 | ≥ 190 | 850°C (1560°F) Continuous |
Designed to resist scaling and atmospheric oxidation up to 675°C under continuous service conditions, and up to 815°C under cyclic thermal loading, ensuring long service lives in high heat loops.
Prevents the precipitation of chromium carbides, mitigating intergranular corrosion, especially in high-stress heat-affected zones (HAZ) of orbital welds.
By containing low nickel content compared to austenitic alloys (like 304 and 316), Grade 409 offers a highly competitive price point for large-scale industrial projects.
Liaocheng Sihe Stainless Steel Material LTD operates 6 state-of-the-art production lines focused on precision drawing and heat treatment.
Our manufacturing facility utilizes the world’s leading bright annealing technology. This online process allows us to soften stainless steel tubing continuously inside a protective atmospheric chamber containing hydrogen and nitrogen. This guarantees a scaling-free, high-gloss surface finish and restores the maximum ductility required for severe on-site bending, flaring, and pressure fitting.
Coiled tubing dimensions range from an outer diameter of 0.125 inch (3.175 millimeters) to 1 inch (25.4 millimeters), with wall thicknesses reaching 0.165 inch (3 millimeters). In order to minimize joint failures in deep offshore umbilical lines and underground hydraulic networks, we provide custom single-coil continuous lengths up to 32,800 feet (10,000 meters).
All coils undergo rigorous pneumatic testing to ensure the complete absence of pinholes and structural micro-cracks along the length.
Destructive tests are executed on coupon samples to confirm that the tube can be cold-worked without localized splitting.
Controlled thermal processing inside protective gas chambers removes cold-work hardening, yielding a shiny oxide-free surface.
100% hardness mapping verifies conformity to specific industrial limits (HRB/HV), ensuring perfect compatibility with connectors.
Leveraging central geographic logistics, raw material integrations, and comprehensive compliance guarantees for global buyers.
Operating out of Liaocheng, China's core stainless steel processing hub, Liaocheng Sihe Stainless Steel Material LTD leverages deep localized steel supply chains. We source raw materials from premier regional metallurgical mills (including Baosteel and TISCO) to guarantee base metal purity. Our integrated production structure reduces lead times to 20-30 days for mass production orders and ensures high pricing predictability despite volatile global nickel and molybdenum markets.
Currently, over 80% of our precision coils are exported to competitive international markets, serving procurement departments in the USA, Germany, Spain, South America, Southeast Asia, the Middle East, and Eastern Europe. We support local projects with tailored custom sizing, rapid dispatch of certification files, and dedicated engineering consultation throughout the procurement cycle.
| Service Category | Details & Specifications | Global Advantage |
|---|---|---|
| Material Options | 304/304L, 316L, 321, 317L, 309S, 310S, INCOLOY 800, Duplex 2205, Super Duplex 2507, Incoloy 825, Inconel 625, AISI 409 | Covers all chemical process, subsea, and high-temp heat loop applications. |
| Custom Processing | Bending, spiral forming, high-precision drawing, flanging, and pre-straightened custom-cut lengths | Eliminates secondary manufacturing steps at the buyer's destination plant. |
| Compliance Documents | MTC (Mill Test Certificate EN 10204 3.1), COA, ISO 9001:2015, PED 2014/68/EU, Origin Certificates | Accelerates customs clearance and guarantees conformance to local regulatory frameworks. |
| Export Logistics | Export-grade reinforced wooden crates, vacuum sealing, specialized hazardous packing, thermal shrink wrapping | Ensures zero corrosion and zero mechanical damage during transit. |
Years Production History
Precision Lines
Global Export Rate
Max Continuous Length (10,000m)
From deepwater subsea control systems to modern automotive engineering, our coiled tubes perform in critical environments.
Tested and approved by third-party testing agencies to guarantee mechanical integrity in harsh marine and industrial environments.
Get answers to design specifications, custom orders, lead times, and logistical guarantees directly from our technical team.
Select from our wider range of industrial products, including heat-exchanger tubing and heavy-duty structural sheets.
For structural integration and standard specifications across different application zones, we maintain separate processing divisions for the following product categories:
Designed for continuous fluid lines in chemical and control systems.
Ultra-small diameter tubes for precision instrumentation and measurement sensors.
Specialized heat transfer tubing engineered for heat exchangers and boiler systems.
Corrosion-resistant flat plate stock designed for chemical storage tanks and structures.
Flexible Seamless Coil
Stainless Steel Tubing
China 310 Steel Coil Tube
Sihe Steel Workshop Overview
