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
Wall≤0.187‘’ (5.0mm) | 100 (690) | 70 (485) | 25 | 290 | 30 |
S32003
Wall＞0.187‘’ (5.0mm) | 95 (655) | 65 (450) | 25 | 290 | 30 |
S32205 | 95 (655) | 70 (485) | 25 | 290 | 30 |
S32304
OD 1 in. (25mm) and Under | 100 (690) | 65 (450) | 25 | … | … |
S32304
OD over 1 in. (25mm) | 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. |
