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Ferritic / Austentic Seamless Stainless Steel Pipe , ASTM Stainless Steel Pipe
Duplex stainless steels are extremely corrosion resistant, work hardenable alloys. Their microstructures consist of a mixture of austenite and ferrite phases. As a result, duplex stainless steels display properties characteristic of both austenitic and ferritic stainless steels. This combination of properties can mean some compromise when compared with pure austenitic and pure ferritic grades.
Duplex stainless steels are in most cases, tougher than ferritic stainless steels. Strengths of duplex stainless steels can in some cases be double that for austenitic stainless steels.
Whilst duplex stainless steels are considered resistant to stress corrosion cracking, they are not as resistant to this form of attack as ferritic stainless steels. However, the corrosion resistance of the least resistant duplex stainless steels is greater than that for the most commonly used grades of stainless steels, i.e. 304 and 316.
Duplex steels are also magnetic, a property that can be used to easily differentiate them from common austenitic grades of stainless.
1. Standards:
ASTM A789 Standard Specification for Seamless and Welded Ferritic/Austenitic Stainless Steel Tubing for General Service
2. Application:
Chemical processing, transport and storage,
Oil and Gas exploration and processing equipment,
Marine and other high chloride environments,
Pulp and paper digesters, liquor tanks and paper machines.
3. Ordering Information
Quantity (feet, meters, or number of lengths),
Name of product (seamless or welded tubes)
Grade (S31803, S31500, S32205, S32750, S32760, S31500, 32001, S32003, S32304, etc)
Size (outside diameter and average wall thickness, unless minimum wall thickness is specified),
Length (specific or random)
Optional requirements (for product analysis; for hydrostatic or nondestructive electric test),
Test report required
Special requirements
4. Chemical Requirements
| UNS Designation | C | Mn | P | S | Si | Ni | Cr | Mo | N | Cu | Others |
| S31500 | 0.03 | 1.20-2.00 | 0.03 | 0.03 | 1.40-2.00 | 4.3-5.2 | 18.0-19.0 | 2.5-3.00 | 0.05-0.1 | … | … |
| S31803 | 0.03 | 2 | 0.03 | 0.02 | 1 | 4.5-6.5 | 21.0-23.0 | 2.5-3.5 | 0.08-0.20 | … | … |
| S32001 | 0.03 | 4.00-6.00 | 0.04 | 0.03 | 1 | 1.0-3.0 | 19.5-21.5 | 0.6 | 0.05-0.17 | 1 | … |
| S32003 | 0.03 | 2 | 0.03 | 0.02 | 1 | 3.0-4.0 | 19.5-22.5 | 1.50-2.00 | 0.14-0.20 | … | … |
| S32205 | 0.03 | 2 | 0.03 | 0.02 | 1 | 4.5-6.5 | 22.0-23.0 | 3.0-3.5 | 0.14-0.20 | … | … |
| S32304 | 0.03 | 2.5 | 0.04 | 0.04 | 1 | 3.0-5.5 | 21.5-24.5 | 0.05-0.60 | 0.05-0.20 | 0.05-0.60 | … |
| S32750 | 0.03 | 1.2 | 0.035 | 0.02 | 0.8 | 6.0-8.0 | 24.0-26.0 | 3.0-5.0 | 0.24-0.32 | 0.5 | … |
| S32760 | 0.05 | 1 | 0.03 | 0.01 | 1 | 6.0-8.0 | 24.0-26.0 | 3.0-4.0 | 0.20-0.30 | 0.50-1.00 | 0.50-1.00 |
5. Tensile and Hardness Requirements
| Tensile and Hardness Requirements | |||||
| UNS Designation | Tensile Strength, min, ksi (Mpa) | Yield Strength, min, ksi (Mpa) | Elongation in 2 in. or 50mm, min, % | Hardness, max. | |
| HBW | HRC | ||||
| S31500 | 92 (630) | 64 (440) | 30 | 290 | 30 |
| S31803 | 90 (620) | 65 (450) | 25 | 290 | 30 |
| S32001 | 90 (620) | 65 (450) | 25 | 290 | 30 |
| S32003 | 100 (690) | 70 (485) | 25 | 290 | 30 |
| S32003 | 95 (655) | 65 (450) | 25 | 290 | 30 |
| S32205 | 95 (655) | 70 (485) | 25 | 290 | 30 |
| S32304 | 100 (690) | 65 (450) | 25 | … | … |
| S32304 | 87 (600) | 58 (400) | 25 | 290 | 30 |
| S32750 | 116 (800) | 80 (550) | 15 | 300 | 32 |
| S32760 | 109 (750) | 80 (550) | 25 | 310 | 32 |
6. Available Size Range
| OD | Thickness | ||
| mm | inch | mm | SCH |
| 10.3~914 | 1/8’’~36’’ | 0.5~70 | All |
| *If the steel grades and size you are looking for are not listed above, please contact us for further information. | |||
