A213 ASTM Seamless Pipe Alloy Steel T91 Grade Heat Exchanger
Application
TIPTOP is providing T91 Boiler Pipe & Seamless hot finished tubes and
pipes for utility boilers, industrial boilers and heat recovery
steam generators. The T91 tubes and pipes are supplied in random
lengths or in fixed lengths to be analysed and agreed at time of
order, in the range between 4,000 mm and 12,000 mm depending on the
size.
1. Application:
Power plant; Boilers; Heat-Exchangers; Chemical Fertilizer;
Petrochemicals; Offshore Oils; Gas Productions; Refineries and etc.
2. Standards:
ASTM A213 Standard Specification for Seamless Ferritic and
Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger
Tubes
3. Ordering Information
Quantity (feet, meters, or number of lengths),
Name of material (seamless tubes),
Grade (T91),
Condition (hot finished or cold finished),
Size (outside diameter and minimum wall thickness),
Length (specific or random),
Hydrostatic Test or Nondestructive Electric Test
Increased Sulfur, and
Special requirements and any supplementary requirements selected.
4. Chemical Requirements
| Chemical Requirements |
| Grade | UNS Designation | Composition, % |
| C | Mn | p | S | Si | Cr | Mo | Other Elements |
| max | max |
| T91 | K90901 | 0.07-0.14 | 0.30-0.60 | 0.02 | 0.01 | 0.20-0.50 | 8.0-9.5 | 0.85-1.05 | V 0.18-0.25 |
| N 0.030-0.070 |
| Ni 0.40 max |
| Al 0.04max |
| Nb 0.06-0.1 |
5. Mechanical Properties
Tensile Strength min: 85ksi/585MPa
Yield Strength min: 60ksi/145MPa
6. Available Size Range
| OD | Thickness |
| mm | inch | mm | SCH |
| 88.9~141.3 | 3''~ 5'' | 2.11~19.05 | SCH10~XXS |
| * If the steel grades and size you are looking for are not listed
above, please contact us for further information. |
7. Heat Treatment Requirements
| Heat Treatment Requirements |
| Grade | UNS Number | Heat Treat Type | Austenitizing/Solutioning Temperature min or range | Cooling Media | Subcritical Annealing or Tempering Temperature
min or range °F 【°C】 |
| T91 | K90901 | normalize and temper | 1900°F【1040°C】 | … | 1350°F【730°C】 |
