Sihe Steel
Sihe Steel
Discover our highly calibrated selection of polished and seamless coiled tubing products, engineered under rigorous international standards (GB, ASTM, ASME, JIS, EN).
In modern industrial and structural engineering, Grade 202 Stainless Steel is recognized as an exceptionally cost-effective, low-nickel, high-manganese austenitic alloy. By replacing a portion of nickel content with manganese and nitrogen, steel makers produce a material that closely matches the performance profile of traditional Chromium-Nickel alloys, such as 304, under moderate corrosive environments. This structural optimization ensures that the material possesses high yield strength, excellent impact toughness at low temperatures, and a fast work-hardening response.
Our specialized 202 polishing tubes are refined using state-of-the-art mechanical abrasives and chemical treatments to yield highly controlled surface finishes. Achieving specific Ra (Roughness Average) values is vital for preventing bio-film adhesion, reducing mechanical friction, and optimizing cosmetic styling in premium architecture. Standard processing involves progressive grinding and buffing, spanning from 180 grit up to 600 grit mirror finishes, to eliminate microscopic peaks and crevices where localized pitting corrosion could initiate.
| Standard / Grade | Carbon (C) max % | Chromium (Cr) % | Manganese (Mn) % | Nickel (Ni) % | Nitrogen (N) max % | Yield Strength Min (MPa) |
|---|---|---|---|---|---|---|
| ASTM A312 / A269 (TP202) | 0.15 | 17.0 - 19.0 | 7.5 - 10.0 | 4.0 - 6.0 | 0.25 | 260 |
| JIS G3459 (SUS202) | 0.15 | 17.0 - 19.0 | 7.5 - 10.0 | 4.0 - 6.0 | 0.25 | 260 |
| EN 10217-7 (1.4373) | 0.15 | 17.0 - 19.0 | 7.5 - 10.0 | 4.0 - 6.0 | 0.25 | 260 |
Our commitment to engineering excellence requires a systematic manufacturing cycle. The processing route begins with high-purity raw steel coils. Precision welding machines utilize Gas Tungsten Arc Welding (GTAW/TIG) or laser welding technology to seal the tube bodies. Post-welding, tubes undergo an advanced online Bright Annealing process. Operating under a protective hydrogen and nitrogen atmosphere at temperatures exceeding 1040°C, this treatment dissolves carbide precipitates back into the austenite matrix, releasing internal stresses without allowing surface oxidation. The result is a clean, reflective surface finish even prior to mechanical polishing.
Subsequent mechanical grinding routines utilize progressive polishing wheels running automated liquid compounds. Our physical testing regimen is comprehensive: 100% pneumatic air-tightness testing at high pressures, expansion flaring tests, and flattening tests to ensure structural weld integrity. High-accuracy eddy current inspection checks for internal surface faults, guaranteeing each tube meets strict quality profiles before shipment.
Online softening heat treatment in a controlled atmosphere eliminates oxide scaling, improving the tube's inherent corrosion resistance and ductility.
Tubes undergo continuous flattening, flaring, and pneumatic testing at rated pressures to verify weld lines remain structural under deformation stresses.
Polishing processes are tailored to achieve Ra values of less than 0.4μm, ideal for preventing microbiological growth in demanding layouts.
As global markets face logistical volatility, partnering with an integrated manufacturer in Liaocheng provides raw material security and production stability. At Liaocheng Sihe Stainless Steel Material LTD, we maintain six advanced production lines. This scale ensures high volume stability, protecting client projects from sudden supply disruptions.
Our centralized operations in Shandong province link our production lines with raw steel manufacturers. This direct integration enables competitive material sourcing, reducing manufacturing waste and processing costs. We ship directly to key economic gateways globally, including Germany, Spain, South America, Southeast Asia, and the Middle East, offering predictable shipping times and reliable product delivery.
We provide end-to-end custom metal fabrication, ensuring raw tubing matches the layout requirements of your engineering project.
We process various steel grades (304, 316L, 2205) and dimensions from 6.35mm to 19mm OD, ensuring compliance with custom architectural or mechanical specifications.
Our computer-controlled mandrel benders support custom spiral bending, tight-radius hairpin fabrication, and structural coil styling.
Automated laser cutting and abrasive saws provide clean, deburred cut edges with precise length tolerances (+/- 0.5mm) for structural components.
Processing ranges from satin brushing to high-gloss mirror finishes. Electropolishing is also available for high-purity medical and semiconductor applications.
Our flanging treatments support secure, leak-free mechanical joints, commonly used in automotive exhaust networks and chemical process lines.
We collaborate with client engineering teams to review tube thickness and mechanical properties, optimizing fluid dynamics and structural safety.
Polished 202 stainless steel tubes are widely used across diverse industries, balancing durability with cost-effective material performance.
We maintain a rigorous quality assurance framework to ensure every shipment complies with global import regulations and industry codes.
We offer diverse product categories tailored to specific project requirements, ensuring long-term material stability and mechanical reliability.
Optimized for critical hydraulic controls, oil and gas exploration, and high-pressure chemical dosing networks.
Wide selection of straight polished tubes and structural components designed for general civil and industrial layouts.
Designed for high-temperature service, combustion chambers, boiler tubes, and thermal processing setups.
Designed for highly corrosive environments, supporting seawater exposure, deep offshore installations, and acidic fluid processing.
Pipes with mechanical grinding and buffing to achieve Ra < 0.4µm, meeting food processing and hygienic piping specifications.
Fine-bore tubes designed for chromatography, sample injection, and precision instrumentation applications.
Get direct answers to common questions about our products, testing methods, lead times, and global shipping policies.
Explore our extended inventory, including premium plates, sheets, and coiled tubing, designed for specialized chemical and industrial applications.
