ASTM A335 P1 Seamless Alloy Steel Pipe For High-Temperature Service
ASTM A335 P1 Seamless Alloy Steel Pipe For High-Temperature Service
Specification
ASTM A335 P1 Seamless Alloy Steel Pipe is for high-temperature service, containing ~0.5% Molybdenum (Mo) for enhanced strength, creep resistance, and wear properties, with applications in power plants, oil & gas, and petrochemicals for steam, fluid transport, and heat exchangers. Key features include minimum tensile strength of 415 MPa (60 ksi), minimum yield strength of 205 MPa (30 ksi), and various heat treatments (annealing, normalizing/tempering) for optimal performance, often being a more economical choice than higher-alloy grades.
| American Standard | Standard Name |
| A335 / A335M | Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service |
ASTM A335 P1 Alloy Steel Pipe Chemical Composition
Sources American Standard A335 / A335M TABLE 1 Chemical Requirements
| ASTM A335 Grades |
UNS Designation |
C | Mn | P | S | Si | Mo |
| P1 | K11522 | 0.10-0.20 | 0.30-0.80 | 0.025 | 0.025 | 0.10-0.50 | 0.44-0.65 |
ASTM A335 P1 Alloy Steel Pipe Mechanical Properties
Sources American Standard A335 / A335M TABLE 3 Tensile Requirements
| ASTM A335 Grade |
UNS Designation |
Yield strength,Min:ksi/MPa | Tensile strength,Min:ksi/MPa | Elongation Requirements % (Min) | Hardness Requirements (Max) | ||
| Brinell | Vickers | Rockwell | |||||
| P1 | K11522 | 30/205 | 55/380 | 30 | – | - | – |
ASTM A335 P1 Alloy Steel Pipe Heat Treatment
Sources American Standard A335 / A335M TABLE 2 Heat Treatment Requirements A
| ASTM A335 Grade | Heat Treatment Type | Normalizing Temperature Range F [C] | Cooling Media | Subcritical Annealing or Tempering Temperature,min or range“F[°C] |
| P1 | full or isothemmal anneal or | - | - | - |
| normalize and temper or | - | - | 1200 [650] | |
| subcritical anneal | - | - | 1200-1300[650-705] | |
| A Where ellipses (_) appear in this table there is no requirement. | ||||
ASTM A335 P1 Alloy Steel Pipe Permissible Variations in Outside Diameter
Sources American Standard A335 / A335M TABLE 7 Permissible Variations in Outside Diameter
|
NPS [DN] Designator |
Over | Under | ||
| in. | mm | in. | mm | |
| 1/8 to 1 1/2 [6 to 40], incl. | 1/64 (0.015) | 0.4 | 1/64 (0.015) | 0.4 |
| Over 1 1/2 to 4 [40 to 100], incl. | 1/32 (0.031) | 0.79 | 1/32 (0.031) | 0.79 |
| Over 4 to 8 [100 to 200], incl. | 1/16 (0.062) | 1.59 | 1/32 (0.031) | 0.79 |
| Over 8 to 12 [200 to 300], incl. | 3/32 (0.093) | 2.38 | 1/32 (0.031) | 0.79 |
| Over 12 [300] | +/- 1% of the specified outside diameter | |||
ASTM A335 P1 Alloy Steel Pipe Permitted Variations in Wall Thickness
Sources American Standard A335 / A335M TABLE 8 Permitted Variations in Wall Thickness
| NPS [DN] Designator | Tolerance, % from Specified | |
| Over | Under | |
| 1/8 to 2 1/2 [6 to 65] incl., all t/D ratios | 20.00% | 12.50% |
| Above 2 1/2 [65], t/D < or = 5% | 22.50% | 12.50% |
| Above 2 1/2 [65], t/D > 5% | 15.00% | 12.50% |
| (t = Specified Wall Thickness; D = Specified Outside Diameter) | ||
ASTM A335 P1 Alloy Steel Pipe Manufacturing Proces
ASTM A335 P1 Alloy Steel Pipe Application
- Power Generation Plants (Fossil Fuel):
- High-Temperature Steam Lines
- Boiler Tubes and Piping
- Heat Exchanger and Condenser Piping
- Petrochemical and Process Industries
- Process Piping
- Refinery Piping
- Industrial Heating Systems
ASTM A335 P1 Alloy Steel Pipe Packing & Loading
a. 1/2"-2"Plain end with black oil paint, caps both ends, bundles with loading belt.
b. 2"-4"Beveled end with black oil paint, caps both ends, bundles with loading belt.
c. 10"-20"Beveled end with black oil paint, caps both ends, loose packed in to container.
→Alloy Steel Pipes is transported in containers
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