Sihe Steel
Sihe Steel
High-performance custom specifications engineered for structural, hydraulic, and extreme-environment industrial applications.
In high-performance industrial design, metastable austenitic alloys like 301 Stainless Steel (UNS S30100) are selected for applications requiring severe strength, high elastic limit, and structural weight reduction. Unlike standard grade 304, 301 features lowered chromium (16.0–18.0%) and nickel (6.0–8.0%) contents. This intentional chemical balance increases the alloy's work-hardening rate, making it highly sensitive to mechanical deformation.
During cold rolling, the parent face-centered cubic (FCC) austenite structure transforms systematically into body-centered tetragonal (BCT) martensite. This strain-induced martensitic transformation ($M_d30$ temperature characteristics) allows the material to reach tensile strengths exceeding 185,000 psi (1275 MPa) in full-hard tempers, while maintaining enough residual ductility for stamping, roll-forming, and bending operations.
A premier Chinese metallurgical manufacturer with 6 state-of-the-art cold rolling & inline drawing production lines
Liaocheng sihe stainless steel material LTD is a leading manufacturer in the field of premium stainless steel coiled tubing, polishing tubes, seamless coiled tubing, sheet & plate developments. We maintain strict compliance with global production standards including GB, ASTM, ASME, JIS, and EN. Our manufacturing catalog features extensive steel grades, including austenitic series 304/304L, 316L, 321, 317L, 309S, 310S, and Incoloy 800, alongside duplex series Duplex 2205, Super Duplex 2507, Incoloy 825, and Inconel 625.
Our infrastructure includes specialized bright annealing lines that apply online heat treatment to relieve internal stress while preventing surface oxidation. This delivers a pristine, ultra-clean surface finish that is essential for aerospace, semiconductor, biotechnology, hydraulic systems, and petrochemical applications.
Integrating predictive manufacturing, dimensional tolerance controls, and carbon-reduction initiatives
Our production facilities utilize Automatic Gauge Control (AGC) systems connected with hydraulic screwdowns. This allows us to achieve strip thickness tolerances within ±0.005mm. Precise dimensional consistency across wide sheet and plate structures prevents spring-back anomalies during subsequent stamping and roll-forming processes.
Laser thickness measurement sensors and digital cameras continuously monitor the surface finish of the 301 and 304 coils. This allows us to identify surface defects, slivers, or pitting instantly, ensuring 100% traceabilty of critical automotive and industrial components.
We are reducing our environmental footprint by using efficient gas recirculation in our bright annealing furnaces. This process recycles process hydrogen, allowing us to align with strict global carbon reduction policies and ESG targets for international supply chains.
Providing reliable performance in critical global industries and high-stress environments
Liaocheng Sihe's high-strength stainless steel products are developed to perform reliably under extreme mechanical load and corrosive conditions. The structural strength of grade 301, combined with the excellent corrosion resistance of 316L, 2205, and Incoloy alloys, enables high efficiency in several primary industries:
Value-added engineering solutions designed to meet exact customer specifications
We work with various materials, including 304, 316L, and Duplex 2205, for stainless steel coiled tubing. We support specifications from outer diameters of 6.35 mm up to 19 mm, tailored to meet your design tolerances.
Using advanced bending and spiral winding machines, we form custom heat exchanger configurations. This shape control maximizes heat transfer surfaces while maintaining wall thickness integrity.
Our facility features high-speed laser cutting, mechanical sawing, and flame cutting tools. This equipment ensures clean, burr-free edges and holds precise tolerances on linear dimensional cuts.
We offer surface preparation options including electrochemical polishing (EP), bright annealing (BA), pickling, passivating, and mechanical grinding. These finishes are designed to meet diverse resistance standards.
We support flanging configurations that are commonly required in automotive exhaust manifolds, chemical transport systems, and precision analytical instrumentation ports.
All finished products are subjected to rigorous testing. This includes flattening, hardness, flaring, mechanical tensile strength, and 100% pneumatic testing. These steps help ensure that every batch of steel conforms to the required safety factors.
Technical comparison table detailing the structural differences between grade 301 and standard grade 304
| Steel Grade | Carbon (%) | Chromium (%) | Nickel (%) | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) |
|---|---|---|---|---|---|---|
| ASTM Type 301 (Annealed) | ≤ 0.15 | 16.0 - 18.0 | 6.0 - 8.0 | ≥ 205 | ≥ 515 | ≥ 40 |
| ASTM Type 301 (1/4 Hard) | ≤ 0.15 | 16.0 - 18.0 | 6.0 - 8.0 | ≥ 515 | ≥ 860 | ≥ 25 |
| ASTM Type 301 (1/2 Hard) | ≤ 0.15 | 16.0 - 18.0 | 6.0 - 8.0 | ≥ 760 | ≥ 1030 | ≥ 15 |
| ASTM Type 301 (Full Hard) | ≤ 0.15 | 16.0 - 18.0 | 6.0 - 8.0 | ≥ 965 | ≥ 1275 | ≥ 9 |
| ASTM Type 304 (Annealed) | ≤ 0.08 | 18.0 - 20.0 | 8.0 - 11.0 | ≥ 205 | ≥ 515 | ≥ 40 |
Innovating to support next-generation structural designs and clean energy systems
The development of high-strength alloys is closely tied to requirements for light-weight structural designs and energy-efficient transportation. Liaocheng Sihe is continually developing processing technologies to improve the work-hardening response of 301 and 304 materials. Our development roadmap includes:
We are working to optimize our alloy processing to support critical clean energy and transport systems:
Managing pricing trends and supply chain logistical risks for international bulk procurement
Nickel and chromium raw material prices fluctuate on the LME. To help customers manage these trends, we offer quarterly contract options that can help stabilize material costs and secure manufacturing volumes.
All international sheet, plate, and coiled orders are packed using reinforced steel cradles, vapor-corrosion-inhibiting (VCI) liners, and heavy wooden crates. This protection helps prevent mechanical vibration damage and marine environment corrosion during transit.
Liaocheng Sihe is certified in accordance with standard EN 10204 3.1 material certificates. We supply testing documentation for chemical analysis, mechanical property verification, eddy-current testing, and compliance with ASTM A666 and ASME Section III design codes.
Documented and accredited manufacturing standards for global projects
Diverse product categories structured to support key industrial systems
Flexible Seamless Coils: Manufactured using duplex steel grade 2205 to provide corrosion resistance and high mechanical strength under pressure.
Stainless Steel Tubing Coils: 1/2-inch coiled tubing designed for high-pressure fluid transfer, instrumentation lines, and chemical injection systems.
China 310 Steel Coil Tube: High-temperature alloy design intended to resist scaling and oxidation up to 1100°C.
Technical answers about design specifications, payment terms, and procurement procedures
Select industrial piping, sheets, and capillary tubing designs
