Sihe Steel
Sihe Steel
Explore our range of ASTM, DIN, and JIS standard 430 grade stainless steel welded pipes, customized for high-temperature and moderate-corrosion environments.
Grade 430 stainless steel is a non-stabilized ferritic alloy containing high chromium content (ranging between 16% and 18%). Unlike the 300 series austenitic counterparts, Grade 430 exhibits a body-centered cubic (BCC) crystal structure, which provides a key mechanical and cost benefit: inherent resistance to chloride-induced stress corrosion cracking (SCC). This makes Grade 430 welded tubing the optimal selection for automotive exhausts, combustion chambers, condenser pipelines, and thermal transmission systems where cyclic heat combined with chloride ions leads to rapid failure in typical 304/316 grades.
By removing nickel from the chemical composition matrix, manufacturers can decouple production pricing from the volatile LME (London Metal Exchange) nickel index, enabling high-performance engineering projects to maintain long-term price stability. While welded pipes of Grade 430 have historically faced challenges in ductility at low temperatures and weld-zone toughness, modern electric-arc melting and advanced annealing technologies implemented at our Liaocheng manufacturing base have dramatically stabilized the grain boundaries.
| Grade (UNS) | Chromium (Cr) % | Nickel (Ni) % | Carbon (C) % Max | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|---|---|---|
| SUS430 / UNS S43000 | 16.0 - 18.0 | ≤ 0.75 | 0.12 | ≥ 450 | ≥ 205 | ≥ 22 |
| SUS304 / UNS S30400 | 18.0 - 20.0 | 8.0 - 10.5 | 0.08 | ≥ 515 | ≥ 205 | ≥ 40 |
| SUS316L / UNS S31603 | 16.0 - 18.0 | 10.0 - 14.0 | 0.03 | ≥ 485 | ≥ 170 | ≥ 40 |
Due to their ferritic structure, 430 pipes display high magnetic susceptibility across all working temperature brackets, a characteristic vital in electrical induction, sorting, and high-frequency instrumentation systems. Furthermore, their low thermal expansion coefficient compared to austenitic grades minimizes thermal fatigue under intensive cyclic heat loads. This specific mechanical stability makes them crucial in commercial gas systems and high-efficiency water heater heat exchangers.
How project managers and procurement officers can optimize logistics, mitigate raw material surges, and establish reliable testing guidelines.
Pricing for 430 welded stainless steel tubes is typically structured based on weight metrics (USD per metric ton) or length constraints (USD per foot/meter). Wall thickness deviations and outer diameter restrictions directly dictate the extrusion speed and annealing times. Specifying Bright Annealing (BA) or specialized mechanical polishing processes changes the processing overhead but provides unmatched corrosion barrier performance.
Any pipe factory claiming international standards must supply a comprehensive Mill Test Certificate (MTC) conforming to EN 10204 3.1. Verify that the batch underwent non-destructive testing, including online Eddy Current Examination and hydrostatic tests. Our plant ensures 100% pneumatic testing for coiled options, safeguarding capillary operations from pressure losses.
For international supply runs, establishing an ongoing Minimum Order Quantity (MOQ) allows factories to run continuous casting schedules, reducing raw scrap generation. When sourcing for projects requiring customized continuous lengths (up to 32,800 feet), early collaboration on standard sizing avoids tooling and die setup charges.
Founded on a commitment to metallurgical excellence, Liaocheng Sihe Stainless Steel Material LTD is a world-class manufacturing authority specializing in the processing, drawing, and high-temperature treatment of stainless steel coiled tubing, polishing tubes, and seamless coiled systems. Equipped with six state-of-the-art production lines, we adhere strictly to GB, ASTM, ASME, JIS, and EN engineering standards to service international industrial clients.
Our production range extends across a versatile list of high-performance alloy matrices: from standard austenitic grades (304/304L, 316L, 321, 317L, 309S, 310S) to advanced high-nickel and duplex alloys like Incoloy 800, Incoloy 825, Inconel 625, Duplex 2205, and Super Duplex 2507. With global logistics routes serving over 30 countries and regions including the United States, Germany, Spain, South America, Southeast Asia, and the Middle East, our technical teams provide full integration support from design phase to final pressure testing.
We feature the world’s leading online Bright Annealing (BA) facilities, permitting inline softening treatments up to 1050°C in pure hydrogen protective atmospheres. Our state-of-the-art testing facility guarantees the integrity of our tubes, conducting flaring tests, mechanical bending trials, tensile strength determinations, hardness tests, and pneumatic leakage verifications before shipping.
Review our dimensional metrics designed for critical instrumentation, hydraulic setups, and offshore umbilical applications.
Our coiled tubes are engineered to support demanding subsea umbilical systems, downhole oil exploration setups, and aerospace pressure circuits. The production characteristics include:
Through careful control of the weld bead height and online laser scanning, we guarantee our tubing meets the high-tolerance requirements of automated orbital welding machines.
Our custom processing capabilities and applications serve key industries worldwide.
We support various materials (including 304, 316L, 2205, 430) and strict design specifications. Diameters ranging from 6.35mm to 19mm can be precision coiled to suit spatial restrictions.
Our capabilities include structural bending, spiral forming, high-efficiency drawing, and custom tube-in-tube setups for heat exchanger cores.
High-precision laser cutting, mechanical abrasive saw cutting, and automatic straightening machines ensure zero-burr ends suitable for immediate orbital fitting.
We develop state-of-the-art chemical passivation, electro-polishing, and pickling finishes to match biotechnology requirements.
We provide precision end forming, flanging, and pre-swaging services, widely used in automotive exhaust systems and chemical pipelines.
Long continuous coil welding and testing, specifically engineered to improve reliability in deeper and harsher offshore environments.
Our quality system is verified by international inspection bodies. Below are the certified credentials confirming our material chemistry, mechanical resistance, and manufacturing processes.
A focused directory of our critical product configurations. Each model is engineered to balance performance with ease of installation.
High-integrity duplex stainless steel containing austenitic and ferritic phases, offering excellent resistance to localized corrosion and stress cracking.
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1/2 inch stainless steel coiled tubing refers to a premium spool designed for subsea control, chemical injection, and precision fluid tracking.
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High-temperature oxidation resistant stainless steel tubing. Excellent tensile properties and fatigue resistance under high thermal operating loads.
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Designed for analytical chromatography, gas chromatography, HPLC, and ultra-high pressure flow networks. Smooth internal surface finish.
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Welded and drawn steel tubing for industrial boilers and condenser packages. Optimized thermal expansion profiles for cyclic operations.
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Aesthetic and mechanical finish options, including satin and mirror finishes, suited for high-purity architectural designs and sanitary pipelines.
VIEW MORE PRODUCTCritical engineering, cost, and logistics guidelines addressed by our steel product specialists.
Advanced alloy grades, sheets, and coiled tubing options manufactured under international quality standards.
As manufacturing shifts toward reduction of carbon emissions, optimizing industrial systems is critical. Standard austenitic grades require high energy processing due to the complex work-hardening properties of nickel. Ferritic Grade 430, however, allows for faster line speeds during cold-forming and drawing cycles, contributing to energy savings during manufacturing.
Additionally, the low thermal expansion profile of 430 pipes prevents thermal wear in high-stress installations like heat exchangers and industrial boilers. We continue to invest in our hydrogen-rich bright annealing processes to reduce surface scaling without chemical pickling, supporting clean and efficient manufacturing practices.
