JIANGSU MITTEL STEEL INDUSTRIAL LIMITED
WUXI DETA METAL PRODUCTS CO.,LTD
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Duplex S31803 / S32205/S32750 Stainless Steel Pipe Tube DSS Pipe Grade 2205 for Chemical Area
2205 Duplex pipe and 2507 Super duplex pipe are our strength product. Duplex stainless steel (DSS) is an austenite-ferrite dual phase stainless steel, it is developed for applications that demand high strength and corrosion resistance. Duplex stainless steel pipe is a cost effective solution for many applications where the 300 series stainless steel pipe are susceptible to chloride stress corrosion cracking. 2205 Duplex pipe and 2507 super duplex stainless steel pipe is an idea choice for the applications which require exceptional strength and corrosion resistance, such as chemical process, petrochemical, and seawater equipment. As a professional duplex pipe supplier in China, we provides high quality duplex 2205 (S31803) pipes and super duplex 2507 (S32750) pipe and tubing according to ASTM A790, ASTM A789, EN 10216-5 etc.
Specification of our stainless steel pipe
| Products Name | Stainless Steel pIpe |
| Diameter | DN6 - DN500 |
| Wall Thickness | SCH10S - XXS or unstandard size as request |
| Length | 6m or cutting any length as request |
| Standard | ASTM JIS EN DIN |
| Technique | Hot Rolled / cold drawn |
| Type | Seamless Pipe / Welded Pipe |
| Main Grade | 201 304 304L 309S 310S 316L 316Ti 316LMod 317L 321 347 410 904L 254SMO 253MA 2205 2507 654SMO 926 400 c276 c22 C4 600 625 800 825.etc |
| MOQ | 500 kgs |
| Loading Port | Shanghai Port |
| Packing | wooden box or ppbag |
Duplex Stainless Steel (DSS) including grades duplex 2205(S31803) and super duplex, they are commonly consist of 50% ferrite and 50% austenite, and generally requires not less than 30%. Duplex stainless steel has good welding performance and high strength. Compared with austenitic stainless steel, it is about double yield strength of stainless steel 316, 317 etc., it make the equipment lighter and stronger. Duplex stainless steel pipe has very good resistance to localized corrosion and stress corrosion cracking. Duplex steel is not intended to be used at temperatures above 300°C due to embrittlement, the continuous use temperature is from -50 to 250 °C.
Duplex Stainlss Steel 2205(UNS S32205, S31803), Super duplex 2507 (UNS S32750), S32760, S32304 etc.
SAF 2205 is the most common grade for duplex stainless steel, ASME/ASTM grade is UNS S32205 or the similar grade S31803 , equivalent to EN/DIN 1.4462.
SAF 2507 is a super duplex steel, the ASTM grade is S32750, equivalent to EN/DIN 1.4410. We can supply duplex pipes and fittings with high quality , mill cost and fast delivery time.
Duplex 2205 and super duplex 2507 is the common grade for us. For other grades, we can manufacturing and provide at considerable order quantity.
What is PREN – Pitting Resistance Equivalent Number, abbreviated as PREN, is a set of algorithms calculated on the basis of the mass fraction of certain elements in the metal. The value is often used in the evaluation method for comparison of pitting corrosion resistance.
There is a formula for PREN calculating:
PREN=Cr%+3.3 *(Mo+0.5W)%+16 *N%
As per ASTM A790, PREN of 22 Cr duplex 2205 pipe is >31, and 25 Cr super duplex pipe is more than 40. If you have special requirement, you are welcome to contact us, our factory can accept customized fabrication.
As professoinal duplex pipe supplier, our factory is mainly focus on the manufacturing of duplex stainless steel pipe, with good experience and reliable quality control system. Nowadays, Kaysuns supplies both duplex stainless steel pipe and super duplex stainless steel pipes and tubes conform to standard ASTM A790, ASTM A789, EN 10216-5 etc.
2507 Super duplex pipe is a super duplex steel pipe with 25% chromium, 4% molybdenum, and 7% nickel. The common grade of super duplex steel is 5027 (S32750, S32760), they have similar composition and mechanical properties. The high chromium, molybdenum, and nitrogen levels provide excellent resistance to pitting, crevice, and general corrosion. Compared to duplex stainless steel pipe, 2507 super duplex pipe is highly resistant to uniform corrosion by organic acids such as formic and acetic acid.
*Super duplex S32760 is not a common grade in China, so we may couldn’t offer it with small quantity for pipes and butt-weld fittings. But it is available for forged fittings and flanges.
Cold drawn and cold rolled is the mainly process for seamless duplex stainless steel pipe. Due to the material characteristic of high strength and hardness, duplex steel is more difficult to process than austenitic steel. It is very easy to damage, especially for small thickness and large diameter pipes , it has a long and hard-working procedures, that’s why the delivery time of duplex pipe is long.
