Sihe Steel
Sihe Steel
Explore our top-selling ASTM certified configurations, manufactured utilizing state-of-the-art drawing processes for critical applications.
ASTM A269 covers nominal-wall-thickness, seamless, and welded austenitic steel tubing for general corrosive service and low- or high-temperature service. Among these alloys, Grade 304 (UNS S30400) is the classic 18-8 stainless steel system. When ordered in continuous coiled lengths, these tubes drastically reduce the necessity of orbital welds, mitigating weak points in fluid dynamics systems and reducing installation costs.
As a key supplier, Liaocheng Sihe Stainless Steel Material LTD leverages over ten years of technical expertise to produce coiled tubes with exceptional wall consistency, surface finish, and metallurgical integrity. By utilizing continuous bright annealing lines, we eliminate residual internal stress, yielding coiled tubes that are easily shapeable yet strong enough to handle extreme mechanical and chemical strains.
Engineered to strict dimensional tolerances in accordance with global standards including GB, ASTM, ASME, JIS, and EN.
| Characteristic / Parameter | ASTM A269 TP304 Specifications |
|---|---|
| Outer Diameter (OD) Range | 0.125 inch (3.175 mm) to 1.00 inch (25.4 mm) |
| Wall Thickness (WT) Range | Up to 0.165 inch (3.0 mm) depending on outer diameter configuration |
| Maximum Continuous Length | Up to 32,800 feet (10,000 meters) in a single jointless length |
| Metallurgical Grades | Austenitic 304, 304L, 316L, 321, 317L, 309S, 310S, INCOLOY 800, 825, Duplex 2205, Super Duplex 2507, Inconel 625 |
| Surface Treatment & Delivery State | Bright Annealed (BA), Mechanically Polished (MP), Electropolished (EP) on demand |
| Primary Quality Testing Methods | Flaring, bending, hardness 100%, stretch testing, compressed air tightness testing, hydrostatic/pneumatic verification |
For high pressure hydraulic lines, mechanical designers utilize Barlow’s equation to determine safe working margins: P = 2St / D (where P = internal pressure, S = allowable stress, t = wall thickness, and D = outer diameter). Utilizing high tensile TP304 coils from Liaocheng Sihe ensures structural consistency, allowing systems to safely operate at peak design pressures without localized bulge failures.
Industrial procurement departments globally demand streamlined supply chains, zero defect metrics, and logistical scalability. In offshore oil extraction and chemical refining, minimizing downtime is paramount. Sourcing continuous coiled tubing up to 10,000 meters removes intermediate connections, preventing fluid leakage in inaccessible subsea systems.
With six dedicated production lines, our typical turnaround for standard samples is 7 days, and bulk manufacturing requests are completed in 20-30 days.
Liaocheng Sihe provides Mill Test Certificates (MTC) conforming to EN 10204 3.1, along with SGS, TUV, and Lloyd's third-party inspections.
Translating raw steel metallurgy into robust solutions across heavy industries and cutting-edge sectors.
Optimized thermodynamic properties and uniform wall thickness in ASTM A269 304 seamless tubes prevent structural fatigue under aggressive temperature cycles.
Bending and orbital-free coils reduce mechanical joints, helping HVAC systems containing high-pressure refrigerants operate leak-free.
Our 304/304L and 316L grades provide the ideal corrosion-resistant pathways required for fluid transportation in hostile refining environments.
Polished interior surfaces satisfy sanitary guidelines (FDA and EHEDG standards), minimizing bacterial accumulation and ensuring clean process flows.
Precision drawing controls inner wall roughness, preventing micro-organic adhesion in ultra-high purity pharmaceutical lines.
Superheated steam environments require structural integrity. Our advanced Incoloy and duplex tubing systems resist pitting and oxidation.
Innovation in metallurgy and manufacturing lines to support global green transition objectives.
As the global hydrogen economy scales, transport systems require alloys resistant to hydrogen embrittlement. Standard 304 and 316L configurations with modified nickel equivalents (>12%) show exceptional resistance. Our upcoming technical roadmap focuses on optimization of nickel content to minimize micro-cracking risks under high-pressure hydrogen service.
At Liaocheng Sihe, we are integrating automated non-destructive testing (NDT) directly into our manufacturing lines. Continuous online eddy-current inspections and laser profiling systems will monitor wall tolerances down to micron increments, providing end-users with dynamic data files for each spool.
The semiconductor industry requires clean gas lines. We are refining our electropolishing (EP) techniques to reliably achieve surface roughness values (Ra) below 0.25 μm in bulk coils, eliminating microscopic cavities that can harbor gas particles and contamination.
By optimizing annealing energy usage and sourcing green hydrogen for our bright annealing atmospheres, we strive to reduce the carbon footprint of our operations, matching our clients' scope 3 decarbonization commitments.
Our commitment to quality extends past drawing the tube. We offer complete post-processing services to prepare tubing for installation:
Verified compliance with international regulatory codes. We maintain thorough tracking for all manufactured lots.
Everything you need to know about our sourcing, standards, technical options, and delivery.
Browse our wider range of sheets, heat exchanger tubes, and coiled systems for high-pressure installations.
