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Utilizing 26 high-precision cold rolling mills and 6 cold drawing machines, we ensure dimensional accuracy and superior mechanical properties.
Stress Corrosion Cracking Resistant TP444 Tube
Ferritic 18Cr-2Mo | UNS S44400 | Immune to Chloride SCC
ASTM A268 | SCC Immune | Ti+Nb StabilizedRelated Products
Introduction
Stress Corrosion Cracking Resistant TP444 Tube is selected for one failure mode: chloride stress corrosion cracking (SCC). Austenitic stainless steels such as 304 and 316 can crack under tensile stress in chloride-bearing water above about 60°C, often with no visible corrosion. The cracks branch through the grains and a tube can leak with very little metal loss, which is why SCC is a leading cause of unplanned failure in hot water tanks, boilers, condensers and heat exchangers. The cause is the nickel-rich face-centered cubic structure itself, and nickel content around 8-14% sits close to the most susceptible range.
TP444 avoids the problem by being ferritic with less than 1% nickel. Standard laboratory screening in boiling 42% magnesium chloride can crack 304 and 316 in hours, while ferritic grades such as 444 survive with no cracking. In practical terms the tube can run with hot, chlorinated water at 60-90°C, residual stresses from bending or rolling, and wet-dry cycling at deposits, all without cracking. Its 17.5-19.5% chromium and 1.75-2.50% molybdenum also give pitting resistance similar to 316L, and titanium plus niobium stabilization keeps welds tough.
Typical installations are hot water cylinders and storage tanks, shell-and-tube condensers on brackish cooling water, plate and tubular heat exchangers for chlorinated process water, solar thermal collectors and swimming pool or spa heating equipment. Mechanical properties are 415 MPa tensile minimum, 275 MPa yield and 20% elongation. Design should respect the ferritic limits: reduced toughness at low temperature, no service in the 400-540°C range for long periods, and care with heavy sections. Where chloride levels are extreme or crevices are stagnant, duplex or super duplex tube remains the safer upgrade.
Specifications
| Material Grade | TP444 (UNS S44400) |
| Standard | ASTM A268, ASME SA268 |
| Outer Diameter | 15.88mm - 63.5mm |
| Wall Thickness | 0.6mm - 3mm |
| Length | Up to 15000mm / Coil |
| Finish | Bright Annealed |
Chemical Composition
| C | N | Cr | Mo | Ni |
| ≤.025 | ≤.035 | 17.5-19.5 | 1.75-2.5 | ≤1.0 |
SCC Immune Low Nickel
Mechanical Strength
Comprehensive Info
| MOQ | 500kg |
| Lead Time | 25 - 35 Days |
| SCC Screening | Boiling MgCl2 Test on Request |
| Nickel Content | Below 1% |
Key Applications
Hot Water Tanks Cylinders and storage vessels
Condensers Brackish water cooled tubes
Pool & Spa Heating Chlorinated water heat exchangers
Advantages
No Chloride SCC
Ferritic structure cannot crack like austenitic.
No Hidden Cracks
Avoids leaks with little visible corrosion.
Pitting Like 316L
Molybdenum covers pitting in chlorinated water.
Higher Yield
275 MPa minimum supports thin walls.
About Jiangsu Jend Tube Co.,Ltd.
As China Stress Corrosion Cracking Resistant TP444 Tube Manufacturers and Wholesale Stress Corrosion Cracking Resistant TP444 Tube Factory, Established in 2011 and is a manufacturing enterprise with a complete manufacturing cycle from raw material selection to finished product delivery. The company currently has more than 100 employees, covers an area of 30015 square meters, and has a registered capital of 48 million yuan, annual production capacity of 3800 tons.
The company has passed ISO9001:2015 quality certification, domestic pressure vessel TS certification, and foreign pressure vessel PED certification. With rich experience and mature technology, we have been expanding our market internationally. At present, our products are exported to more than 50 countries and regions including Europe, America, Southeast Asia, and the Middle East.
The company adheres to different production norms and standards such as the American standard (ASTM), the European standard (EN), the German standard (DIN), the Japanese standard (JIS), the Russian standard (GOST), and the Chinese standard (GB).
Our company specializes in and customizes various specifications of Martensite TP410 (0Cr13, 1Cr13), Ferrite TP405 (1Cr13Al), TP430 (1Cr17), TP444 (0Cr18Mo2), TP439, TP409 (0Cr11Ti), It is also proficient in manufacturing Austenitic seamless stainless steel pipes of series such as TP304(L/H), TP316(L/H/Ti), TP310S, TP317, TP321(H) and TP347(H). Duplex such as S31803, S2205, S32750, S32304, and Nickel-based alloys Monel400, Monel600, Monel800, GH3030, 904L, Inconel 625, etc.
The company mainly produces seamless steel pipes with the following specifications: outer diameter: 3.18mm to 406.4mm, wall thickness: 0.3mm to 20mm, and the longest length is 25000mm. Additionally, it can customize seamless steel pipes with special materials and specifications according to customer requirements. The company attaches great importance to scientific innovation. The staff of the company vigorously develop technological research and development.
Jiangsu Jend Tube Co.,Ltd. will continuously accumulate professional knowledge and capabilities, striving to become a leader in the domestic market and even the world market. Strive to be the most reassuring pipe manufacturing enterprise for customers.
Precision Manufacturing and Process Optimization
We rely on precision equipment and optimized production technologies to achieve outstanding mechanical performance and consistent product quality.
Cold Rolling and Cold Drawing
Solution Heat Treatment
Natural gas solution treatment furnaces and BA solution treatment furnaces optimize the material's grain structure, enhancing corrosion resistance.
Precision Straightening and Polishing
10 straightening machines and 8 finishing polishing machines guarantee product surface smoothness and dimensional accuracy.
Automated Inspection and Quality Assurance
Real-time monitoring systems ensure the stable quality of every batch of products.
Usage Tips
Check Water Temperature
SCC risk rises above about 60°C; this is the range where 304/316 should be replaced.
Mind Low-Temperature Toughness
Ferritic tube is less tough in the cold; avoid impact loading below freezing.
Services
SCC Screening Test
Boiling magnesium chloride coupon test on request.
Coil Supply
Long lengths for coil heat exchangers.
Bending Support
Radius guidance to limit springback.
Logistics
30% T/T Deposit / L/C at sight. Clean-packed with end caps to protect the bright finish and keep potable-water tube free of contamination.
Standards
ASTM A268
ASME SA268
EN 10217-7 1.4521
ISO 9001
Frequently Asked Questions
What is chloride stress corrosion cracking?
Cracking of stressed austenitic stainless steel in warm chloride water.
Why is TP444 immune?
It is ferritic with almost no nickel, so the cracking mechanism does not operate.
At what temperature does 316 start to crack?
Risk rises above about 60°C.
Can TP444 replace 316L in hot water tanks?
Yes, it is widely used for that.
Does it resist pitting?
Yes, comparable to TP316L.
When is duplex a better choice?
In extreme chloride levels or stagnant crevices.
Need SCC Resistant Tube for Hot Water Service?
Send water chemistry and temperature for a material suitability recommendation.
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