Sihe Steel
Sihe Steel
Premium grade 202 and high-alloy stainless steel welded pipes manufactured to international standards. Click below for pricelists, custom sizes, and technical datasheets.
Grade 202 stainless steel is a type of Cr-Mn-Ni (Chromium-Manganese-Nickel) austenitic alloy, specifically standardized under ASTM A312, ASTM A554, and JIS G3446. Originally designed to conserve nickel by substituting manganese, Grade 202 provides exceptional mechanical toughness, decent corrosion resistance, and high structural stability at a significantly more competitive price point compared to classical 300-series steels like SS304.
By balancing the nitrogen and manganese content, the austenitic phase is stabilized, preventing transformation to martensite during cold forming. This makes 202 welded tubing highly suitable for decorative piping, structural automotive exhaust parts, and moderate chemical handling systems. In low-to-medium corrosive applications, it delivers outstanding cost-to-performance efficiency.
Analyzing the structural difference between 202, 304, and 201 reveals why 202 has higher yield strength but lower raw material cost volatility.
| Grade | Chromium (Cr) | Nickel (Ni) | Manganese (Mn) | Nitrogen (N) | Carbon (C) | Silicon (Si) | Phosphorus (P) / Sulfur (S) |
|---|---|---|---|---|---|---|---|
| 202 Stainless Steel | 17.0 - 19.0% | 4.0 - 6.0% | 7.5 - 10.0% | ≤ 0.25% | ≤ 0.15% | ≤ 1.00% | P ≤ 0.06% | S ≤ 0.03% |
| 304 Stainless Steel | 18.0 - 20.0% | 8.0 - 10.5% | ≤ 2.0% | ≤ 0.10% | ≤ 0.08% | ≤ 0.75% | P ≤ 0.045% | S ≤ 0.03% |
| 201 Stainless Steel | 16.0 - 18.0% | 3.5 - 5.5% | 5.5 - 7.5% | ≤ 0.25% | ≤ 0.15% | ≤ 1.00% | P ≤ 0.06% | S ≤ 0.03% |
Innovation in alloying science and welding parameters driving next-generation 200-series performance.
By optimizing gaseous nitrogen injection during AOD refining, we achieve high yield strengths without losing low-temperature impact toughness, elevating 202's performance thresholds.
Integrating 100% online dry hydrogen atmosphere annealing prevents scale formation and keeps the alloy surface pristine, completely eliminating the need for aggressive acid pickling.
Real-time ferrite indicators and phase analysis ensure that the weld bead remains crack-free, maximizing toughness at high temperature applications such as exhaust headers.
Liaocheng Sihe Stainless Steel Material LTD operates 6 advanced high-tech production lines designed specifically for stainless steel coiled tubing, capillary tubing, and long-run heat exchanger pipes.
By introducing world-class online bright annealing systems, we ensure complete soft tempering of our tubes directly on the production line. This eliminates work hardening stresses, resulting in exceptional ductility and high geometric precision across all delivered runs.
Streamlined production pathways reducing lead times while preserving high metallurgical integrity.
Located in Liaocheng, the steel manufacturing hub of Shandong, we have direct lanes to major ocean ports, assuring rapid port transfers, reduced container consolidation times, and safe overseas packaging.
We provide full-spectrum customization including precision tube drawing, complex spiral forming, multi-angle bending, high-precision laser cutting, and flanging for a seamless integration in structural builds.
Every single bulk shipment is dispatched with verified Material Test Reports (MTR) according to EN 10204 3.1. We log chemical constituents, tensile indices, and hydrostatic test records.
High-integrity piping solutions serving mission-critical infrastructure worldwide.
High thermal transmission efficiency combined with precise wall thickness tolerances, reducing tube fatigue under cyclic thermal loads.
Smooth internal capillary design ensures clean refrigerant flow pathways, minimizing internal friction losses in condenser circuits.
Reliable corrosion protection in mildly acidic conditions, assuring longevity in standard water supply and manufacturing flow networks.
Highly sanitizable inner surface finish obtained via advanced online polishing and bright hydrogen treatment cycles.
Pristine surface compliance meeting bio-pharma guidelines. Resists bio-fouling and chemical reaction profiles in liquid transport.
Excellent performance limits in steam lines, high pressure lines, and general auxiliary energy transport processes.
Specifically manufactured to withstand high-pressure hydrocarbon transport environments, ensuring leak-free configurations.
The material of choice for performance exhaust pipes, headers, and aircraft structural framing, optimizing strength-to-weight ratio.
To streamline integration into engineering projects, we support advanced preprocessing tasks in-house, significantly minimizing assembly schedules on the field.
Processing support for various materials (e.g. 304, 316L, 2205) and custom specifications ranging from 6.35mm to 19mm diameter coils.
Precision spiral drawing and bending designed to maximize flow heat transfer characteristics inside compact heat exchangers.
Fast laser cutting, mechanical abrasive cutting, or localized flame cutting for minimal burr and ultra-tight dimensional length tolerances.
Mechanical grinding, electropolishing, or bright tempering options designed for strict aesthetic and hygienic piping installations.
Used heavily in automotive exhaust joints, chemical pipelines, and instrument housings, eliminating weld fatigue risks near connections.
Liaocheng Sihe is committed to safety and regulatory compliance. We regularly verify our processes against world-class industrial standards.
Explore our specialized range of coils, capillary pipes, and industrial profiles engineered for precision operations.
Comprehensive procurement, compliance, and product support details for engineering firms and purchasing departments.
Premium grade capillary tubes, heat exchanger pipes, and customized stainless steel coil tubing configurations.
