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2507 super duplex is a high-alloyed duplex stainless steel with a PRE (pitting equivalent) value of at least 42.5. This grade is characterized by very good resistance to chloride corrosion and very high mechanical strength. It is particularly suitable for use in corrosive environments such as warm chlorinated seawater and acidic chloride-containing media. It is widely used for heat exchangers in offshore oil and gas exploration/production and petrochemical/chemical processing. The grade is also suitable for hydraulic and instrumentation applications in tropical marine environments.
| | |
| UNS Designation | C | Si | Mn | P | S | Cr | Ni | Mo | N | Cu |
| max | max | max | max | max | ||||||
| S31803 | 0.03 | 1 | 2 | 0.03 | 0.02 | 21.0 - 23.0 | 4.5 - 6.5 | 2.5 - 3.5 | 0.08 - 0.20 | - |
| 2205 | ||||||||||
| S32205 | 0.03 | 1 | 2 | 0.03 | 0.02 | 22.0 - 23.0 | 4.5 - 6.5 | 3.0 - 3.5 | 0.14 - 0.20 | - |
| S32750 | 0.03 | 0.8 | 1.2 | 0.035 | 0.02 | 24.0 - 26.0 | 6.0 - 8.0 | 3.0 - 5.0 | 0.24 - 0.32 | 0.5 max |
| 2507 | ||||||||||
| S32760 | 0.05 | 1 | 1 | 0.03 | 0.01 | 24.0 - 26.0 | 6.0 - 8.0 | 3.0 - 4.0 | 0.20 - 0.30 | 0.50 -1.00 |
| Steel grade | Physical Property | |||
| Y.S | T.S | EL. | HRB | |
| S31803 | ≥450 | ≥620 | ≥25 | - |
| S32205/2205 | ≥450 | ≥620 | ≥25 | - |
| S32750/2507 | ≥550 | ≥800 | ≥15 | ≤32 |
| S32760 | ≥550 | ≥750 | ≥45 | ≤29 |
Seamless stainless steel coils are preferred for many applications, extreme environments and critical industries due to its low risk of impurities, good corrosion resistance and low installation costs. For example, it is commonly used in chemical process and instrumentation applications such as steam and tracer bundles, flow measurement and sensing, and fluid and gas transfer. Uses in the oil and gas industry include control lines, chemical injection and subsea valves.
New applications for seamless coiled tubing include compressed natural gas (CNG) transfer for vehicle refueling, hydrogen transfer for material handling applications and firefighter air replenishment systems (FARS). Because seamless piping does not require multiple fittings, companies can reduce installation time, labor and costs.