Boiler Tube
ASTM A335 Seamless Alloy Pipes
ASTM A 335/A 335M Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature ServiceASTM A335 P9 Seamless Ferritic Alloy-Steel Pipe cover nominal wall seamless alloy-steel pipe intended for high-temperature service.
Standard:ASTM A 335/A 335M
Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
ASTM A335 P9 Seamless Ferritic Alloy-Steel Pipe cover nominal (average) wall seamless alloy-steel pipe intended for high-temperature service.
Pipe ordered to ASTM A 335 specification shall be suitable for bending,flanging (vanstoning), and similar forming operations, and for fusion welding. Selection will depend upon design, service conditions, mechanical properties, and high-temperature characteristics.
Manufacture:Seamless process ,Hot-finished or Cold-finished
Wall thickness(WT): 2.1mm——20 mm.
Outer diameter (OD): 21 mm——509mm
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Threaded
Materials and Manufacture
Grade P5 Pipe may be either hot finished or cold drawn with the finishing treatment.
Heat Treatment:
P5 Seamless Ferritic Alloy-Steel Pipe will be reheated and furnished in the full-annealed, isothermal annealed, or normal-ized and tempered condition. If furnished in the normalized and tempered condition, the minimum tempering temperature are 1250°F [675°C].
Chemical Composition of ASTM A335 P5
| Grade | Chemical Composition(%) | ||||||
| C | Mn | P | S | Si | Cr | Mo | |
| P5 | ≤0.015 | 0.30-0.60 | ≤0.025 | ≤0.025 | ≤0.50 | 4.00-6.00 | 0.45-0.65 |
Mechanical Properties of ASTM A335 P5
| Grade | Mechanical property | ||
| Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) | |
| P5 | ≥415 | ≥205 | ≥30 |
Outside diameter tolerances of ASTM A335 Seamless Ferritic Alloy-Steel Pipe
| NPS Designator | Over | Under | ||
| in. | mm | in. | mm | |
| 1⁄8 to 1 1⁄2 , incl. | 1 ⁄ 64 (0.015) | 0.40 | 1 ⁄ 64 (0.015) | 0.40 |
| Over 1 1⁄2 to 4, incl. | 1 ⁄ 32 (0.031) | 0.79 | 1 ⁄ 32 (0.031) | 0.79 |
| Over 4 to 8, incl. | 1 ⁄ 16 (0.062) | 1.59 | 1 ⁄ 32 (0.031) | 0.79 |
| Over 8 to 12, incl. | 3 ⁄ 32 (0.093) | 2.38 | 1 ⁄ 32 (0.031) | 0.79 |
| Over 12 | ± 1 % | |||
Hydrostatic Test
Each length of pipe shall be subjected to the hydrostatic test or nondestructive examination.
Mechanical Tests Required
Transverse or Longitudinal Tension Test and Flattening Test, Hardness Test, or Bend Test—For material heat treated in a batch-type furnace, tests shall be made on 5 % of the pipe from each treated lot.
For small lots, at least 1 pipe shall be tested. For material heat treated by the continuous process, tests shall be made on a sufficient number of pipe to constitute 5 % of the lot, but in no case less than 2 pipe.
Marking
In addition to the marking prescribed in Specification A 999/A 999M, the marking shall include the length, the ANSI schedule number and the heat number or manufacturer’s number by which the heat can be identified.
Ordering Information
Orders for material includes the following, as required, to describe the desired material adequately:
(1) Quantity (feet, centimetres, or number of lengths),
(2) Name of material (seamless alloy steel pipe),
(3) Grade (P5),
(4) Manufacture (hot-finished or cold-drawn),
(5) Size (NPS or outside diameter and schedule number or average wall thickness),
(6) Length (specific or random),
(7) End finish (Ends Section of Specification A 999/A 999M),
(8) Test report required (Certification Section of Specification AA 999/A 999M)
ASTM A335 P9 Seamless Pipe for High-Temperature Service,A335 P9 Seamless Pipe reheated and furnished in the full-annealed, isothermal annealed, or normal-ized and tempered condition. the minimum tempering temperature are 1250°F [675°C].
Standard:ASTM A 335/A 335M
Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
ASTM A335 P9 Seamless Ferritic Alloy-Steel Pipes cover nominal (average) wall seamless alloy-steel pipe intended for high-temperature service.
| Grade | Standard | Country |
| STBA26 | JIS G3462 | Japan |
| T9 | ASTM A213 | U.S.A |
| HT7 | SAVDNIK | Sweden |
Wall thickness(WT): 2.1mm——20 mm.
Outer diameter (OD): 21 mm——509mm
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Threaded
Grade P9 Pipe may be either hot finished or cold drawn with the finishing treatment.
Heat Treatment:
P9 Seamless Ferritic Alloy-Steel Pipe will be reheated and furnished in the full-annealed, isothermal annealed, or normal-ized and tempered condition. If furnished in the normalized and tempered condition, the minimum tempering temperature are 1250°F [675°C].
Chemical Composition of ASTM A335 P9
| Grade | Chemical Composition(%) | ||||||
| C | Mn | P | S | Si | Cr | Mo | |
| P9 | ≤0.015 | 0.30-0.60 | ≤0.025 | ≤0.025 | ≤0.50 | 4.00-6.00 | 0.45-0.65 |
| Grade | Mechanical property | ||
| Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) | |
| P9 | ≥415 | ≥205 | ≥30 |
Outside diameter tolerances of ASTM A335 Seamless Ferritic Alloy-Steel Pipe
| NPS Designator | Over | Under | ||
| in. | mm | in. | mm | |
| 1⁄8 to 1 1⁄2 , incl. | 1 ⁄ 64 (0.015) | 0.40 | 1 ⁄ 64 (0.015) | 0.40 |
| Over 1 1⁄2 to 4, incl. | 1 ⁄ 32 (0.031) | 0.79 | 1 ⁄ 32 (0.031) | 0.79 |
| Over 4 to 8, incl. | 1 ⁄ 16 (0.062) | 1.59 | 1 ⁄ 32 (0.031) | 0.79 |
| Over 8 to 12, incl. | 3 ⁄ 32 (0.093) | 2.38 | 1 ⁄ 32 (0.031) | 0.79 |
| Over 12 | ± 1 % | |||
Hydrostatic Test
Each length of pipe shall be subjected to the hydrostatic test or nondestructive examination.
Mechanical Tests Required
Transverse or Longitudinal Tension Test and Flattening Test, Hardness Test, or Bend Test—For material heat treated in a batch-type furnace, tests shall be made on 5 % of the pipe from each treated lot.
For small lots, at least 1 pipe shall be tested. For material heat treated by the continuous process, tests shall be made on a sufficient number of pipe to constitute 5 % of the lot, but in no case less than 2 pipe.
Marking
In addition to the marking prescribed in Specification A 999/A 999M, the marking shall include the length, the ANSI schedule number and the heat number or manufacturer’s number by which the heat can be identified.
Orders for material includes the following, as required, to describe the desired material adequately:
(1) Quantity (feet, centimetres, or number of lengths),
(2) Name of material (seamless alloy steel pipe),
(3) Grade (P9),
(4) Manufacture (hot-finished or cold-drawn),
(5) Size (NPS or outside diameter and schedule number or average wall thickness),
(6) Length (specific or random),
(7) End finish (Ends Section of Specification A 999/A 999M),
(8) Test report required (Certification Section of Specification AA 999/A 999M)
ASTM A335 Grade P11 Pipe are either hot finished or cold drawn with the finishing treatment. P11 Seamless Ferritic Alloy-Steel Pipe are reheated and furnished in the full-annealed, isothermal annealed, or normal-ized and tempered condition.
Standard:ASTM A 335/A 335M
Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
ASTM A335 P11 Seamless Ferritic Alloy-Steel Pipes cover nominal (average) wall seamless alloy-steel pipe intended for high-temperature service.
Pipe ordered to ASTM A 335 specification shall be suitable for bending,flanging (vanstoning), and similar forming operations, and for fusion welding. Selection will depend upon design, service conditions, mechanical properties, and high-temperature characteristics.
ASTM A335 P11 Seamless Ferritic Alloy-Steel Pipe Quick Details
Manufacture:Seamless process ,Hot-finished or Cold-finished
Wall thickness(WT): 2.1mm——20 mm.
Outer diameter (OD): 21 mm——509mm
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Threaded
Materials and Manufucture
Grade P11 Pipe may be either hot finished or cold drawn with the finishing treatment.
Heat Treatment:
P11 Seamless Ferritic Alloy-Steel Pipe are reheated and furnished in the full-annealed, isothermal annealed, or normal-ized and tempered condition. If furnished in the normalized and tempered condition,the minimum tempering temperature for Grades P11are 1200°F [650°C].
Chemical Composition of ASTM A335 P11
| Grade | Chemical Composition(%) | ||||||
| C | Mn | P | S | Si | Cr | Mo | |
| P11 | 0.05-0.015 | 0.30-0.60 | ≤0.025 | ≤0.025 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 |
Mechanical Properties of ASTM A335 P11
| Grade | Mechanical property | ||
| Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) | |
| P11 | ≥415 | ≥205 | ≥30 |
Outside diameter tolerances of ASTM A335 Seamless Ferritic Alloy-Steel Pipe
| NPS Designator | Over | Under | ||
| in. | mm | in. | mm | |
| 1⁄8 to 1 1⁄2 , incl. | 1 ⁄ 64 (0.015) | 0.40 | 1 ⁄ 64 (0.015) | 0.40 |
| Over 1 1⁄2 to 4, incl. | 1 ⁄ 32 (0.031) | 0.79 | 1 ⁄ 32 (0.031) | 0.79 |
| Over 4 to 8, incl. | 1 ⁄ 16 (0.062) | 1.59 | 1 ⁄ 32 (0.031) | 0.79 |
| Over 8 to 12, incl. | 3 ⁄ 32 (0.093) | 2.38 | 1 ⁄ 32 (0.031) | 0.79 |
| Over 12 | ± 1 % | |||
Hydrostatic Test
Each length of pipe shall be subjected to the hydrostatic test or nondestructive examination.
Mechanical Tests Required
Transverse or Longitudinal Tension Test and Flattening Test, Hardness Test, or Bend Test—For material heat treated in a batch-type furnace, tests shall be made on 5 % of the pipe from each treated lot.
For small lots, at least 1 pipe shall be tested. For material heat treated by the continuous process, tests shall be made on a sufficient number of pipe to constitute 5 % of the lot, but in no case less than 2 pipe.
Marking
In addition to the marking prescribed in Specification A 999/A 999M, the marking shall include the length, the ANSI schedule number and the heat number or manufacturer’s number by which the heat can be identified.
Ordering Information
Orders for material includes the following, as required, to describe the desired material adequately:
(1) Quantity (feet, centimetres, or number of lengths),
(2) Name of material (seamless alloy steel pipe),
(3) Grade (P11),
(4) Manufacture (hot-finished or cold-drawn),
(5) Size (NPS or outside diameter and schedule number or average wall thickness),
(6) Length (specific or random),
(7) End finish (Ends Section of Specification A 999/A 999M),
(8) Test report required (Certification Section of Specification AA 999/A 999M)
ASTM A335 Grade P12—The steel shall be made by coarsegrain melting practice.ASTM A335 Grade P12 Seamless Ferritic Alloy-Steel Pipe are either hot finished or cold drawn with the finishing treatment.
Standard:ASTM A 335/A 335M
Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
ASTM A335 P12 Seamless Ferritic Alloy-Steel Pipes cover nominal (average) wall seamless alloy-steel pipe intended for high-temperature service.
Pipe ordered to ASTM A 335 specification shall be suitable for bending,flanging (vanstoning), and similar forming operations, and for fusion welding. Selection will depend upon design, service conditions, mechanical properties, and high-temperature characteristics.
Manufacture:Seamless process ,Hot-finished or Cold-finished
Wall thickness(WT): 2.1mm——20 mm.
Outer diameter (OD): 21 mm——509mm
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Threaded
Materials and Manufacture
Grade P12—The steel shall be made by coarsegrain melting practice.
Grade P12 Pipe may be either hot finished or cold drawn with the finishing treatment
Heat Treatment:
Pipe of Grades P12, either hot finished or cold drawn, may be given a final heat treatment at 1200°F [650°C] to 1300°F [705°C] .
Chemical Composition of ASTM A335 P12
| Grade | Chemical Composition(%) | ||||||
| C | Mn | P | S | Si | Cr | Mo | |
| P12 | ≤0.015 | 0.30-0.60 | ≤0.025 | ≤0.025 | ≤0.50 | 0.80-1.25 | 0.45-0.65 |
Mechanical Properties of ASTM A335 P12
| Grade | Mechanical property | ||
| Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) | |
| P12 | ≥415 | ≥205 | ≥30 |
Outside diameter tolerances of ASTM A335 Seamless Ferritic Alloy-Steel Pipe
| NPS Designator | Over | Under | ||
| in. | mm | in. | mm | |
| 1⁄8 to 1 1⁄2 , incl. | 1 ⁄ 64 (0.015) | 0.40 | 1 ⁄ 64 (0.015) | 0.40 |
| Over 1 1⁄2 to 4, incl. | 1 ⁄ 32 (0.031) | 0.79 | 1 ⁄ 32 (0.031) | 0.79 |
| Over 4 to 8, incl. | 1 ⁄ 16 (0.062) | 1.59 | 1 ⁄ 32 (0.031) | 0.79 |
| Over 8 to 12, incl. | 3 ⁄ 32 (0.093) | 2.38 | 1 ⁄ 32 (0.031) | 0.79 |
| Over 12 | ± 1 % | |||
Hydrostatic Test
Each length of pipe shall be subjected to the hydrostatic test or nondestructive examination.
Mechanical Tests Required
Transverse or Longitudinal Tension Test and Flattening Test, Hardness Test, or Bend Test—For material heat treated in a batch-type furnace, tests shall be made on 5 % of the pipe from each treated lot.
For small lots, at least 1 pipe shall be tested. For material heat treated by the continuous process, tests shall be made on a sufficient number of pipe to constitute 5 % of the lot, but in no case less than 2 pipe.
Marking
In addition to the marking prescribed in Specification A 999/A 999M, the marking shall include the length, the ANSI schedule number and the heat number or manufacturer’s number by which the heat can be identified.
Ordering Information
Orders for material includes the following, as required, to describe the desired material adequately:
(1) Quantity (feet, centimetres, or number of lengths),
(2) Name of material (seamless alloy steel pipe),
(3) Grade (P12),
(4) Manufacture (hot-finished or cold-drawn),
(5) Size (NPS or outside diameter and schedule number or average wall thickness),
(6) Length (specific or random),
(7) End finish (Ends Section of Specification A 999/A 999M),
(8) Test report required (Certification Section of Specification AA 999/A 999M)
ASTM A335 P22 Seamless Ferritic Alloy-Steel Pipes cover nominal wall seamless alloy-steel pipe intended for high-temperature service.
Standard:ASTM A 335/A 335M
Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
ASTM A335 P22 Seamless Ferritic Alloy-Steel Pipes cover nominal (average) wall seamless alloy-steel pipe intended for high-temperature service.
ASTM A335 P22 Steel
Equivalent steel grade
Manufacture:Seamless process ,Hot-finished or Cold-finished
Wall thickness(WT): 2.1mm——20 mm.
Outer diameter (OD): 21 mm——509mm
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Threaded
Materials and Manufacture
Grade P22 Pipe may be either hot finished or cold drawn with the finishing treatment.
Heat Treatment:
Grade P22 Seamless Ferritic Alloy-Steel Pipe will be reheated and furnished in the full-annealed, isothermal annealed, or normal-ized and tempered condition. If furnished in the normalized and tempered condition, the minimum tempering temperature are 1250°F [675°C].
Chemical Composition of ASTM A335 P22
| Grade | Chemical Composition(%) | ||||||
| C | Mn | P | S | Si | Cr | Mo | |
| P22 | ≤0.015 | 0.30-0.60 | ≤0.025 | ≤0.025 | ≤0.50 | 1.90-2.60 | 0.87-1.13 |
Mechanical Properties of ASTM A335 P22
| Grade | Mechanical property | ||
| Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) | |
| P22 | ≥415 | ≥205 | ≥30 |
Outside diameter tolerances of ASTM A335 Seamless Ferritic Alloy-Steel Pipe
| NPS Designator | Over | Under | ||
| in. | mm | in. | mm | |
| 1⁄8 to 1 1⁄2 , incl. | 1 ⁄ 64 (0.015) | 0.40 | 1 ⁄ 64 (0.015) | 0.40 |
| Over 1 1⁄2 to 4, incl. | 1 ⁄ 32 (0.031) | 0.79 | 1 ⁄ 32 (0.031) | 0.79 |
| Over 4 to 8, incl. | 1 ⁄ 16 (0.062) | 1.59 | 1 ⁄ 32 (0.031) | 0.79 |
| Over 8 to 12, incl. | 3 ⁄ 32 (0.093) | 2.38 | 1 ⁄ 32 (0.031) | 0.79 |
| Over 12 | ± 1 % | |||
Hydrostatic Test
Each length of pipe shall be subjected to the hydrostatic test or nondestructive examination.
Mechanical Tests Required
Transverse or Longitudinal Tension Test and Flattening Test, Hardness Test, or Bend Test—For material heat treated in a batch-type furnace, tests shall be made on 5 % of the pipe from each treated lot.
For small lots, at least 1 pipe shall be tested. For material heat treated by the continuous process, tests shall be made on a sufficient number of pipe to constitute 5 % of the lot, but in no case less than 2 pipe.
Marking
In addition to the marking prescribed in Specification A 999/A 999M, the marking shall include the length, the ANSI schedule number and the heat number or manufacturer’s number by which the heat can be identified.
Ordering Information
Orders for material includes the following, as required, to describe the desired material adequately:
(1) Quantity (feet, centimetres, or number of lengths),
(2) Name of material (seamless alloy steel pipe),
(3) Grade (P22),
(4) Manufacture (hot-finished or cold-drawn),
(5) Size (NPS or outside diameter and schedule number or average wall thickness),
(6) Length (specific or random),
(7) End finish (Ends Section of Specification A 999/A 999M),
(8) Test report required (Certification Section of Specification AA 999/A 999M)
ASTM A335 Grade P91 Seamless Ferritic Alloy-Steel Pipes will be normalized at 1900°F [1040°C] minimum, and tempered at 1350°F [730°C] minimum as a final heat treatment.
Standard: ASTM A 335/A 335M
Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
ASTM A335 P91 Seamless Ferritic Alloy-Steel Pipes cover nominal (average) wall seamless alloy-steel pipe intended for high-temperature service.
Wall thickness(WT): 2.1mm——20 mm.
Outer diameter (OD): 21 mm——509mm
Common specifications:25mm*7mm, 141.3mm*6.55mm, 323.9mm*25.4mm,
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Threaded
Grade P91 Pipe may be either hot finished or cold drawn with the finishing treatment.
Heat Treatment:
Grade P91 Seamless Ferritic Alloy-Steel Pipes will be normalized at 1900°F [1040°C] minimum, and tempered at 1350°F [730°C] minimum as a final heat treatment.
Alternatively, liquid quenching and tempering is allowed for thicknesses above 3 in. when we mutually agreed with the purchaser.
Chemical Composition of ASTM A335 P91
| Grade | C | Mn | P | S | Si | Cr |
| A335 P91 | 0.08-0.12 | 0.3-0.6 | ≤0.02 | ≤0.01 | 0.2-0.5 | 8.0-9.5 |
| Mo | V | N | Ni | Al | Nb | |
| 0.85-1.05 | 0.18-0.25 | 0.03-0.07 | ≤0.4 | ≤0.04 | 0.06-0.10 |
| Grade | Mechanical property | ||
| Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) | |
| P91 | ≥510 | ≥400 | ≥20 |
Analysis of welding performance of ASTM A335 P91
Outside diameter tolerances of ASTM A335 Seamless Ferritic Alloy-Steel Pipe
| NPS Designator | Over | Under | ||
| in. | mm | in. | mm | |
| 1⁄8 to 1 1⁄2 , incl. | 1 ⁄ 64 (0.015) | 0.40 | 1 ⁄ 64 (0.015) | 0.40 |
| Over 1 1⁄2 to 4, incl. | 1 ⁄ 32 (0.031) | 0.79 | 1 ⁄ 32 (0.031) | 0.79 |
| Over 4 to 8, incl. | 1 ⁄ 16 (0.062) | 1.59 | 1 ⁄ 32 (0.031) | 0.79 |
| Over 8 to 12, incl. | 3 ⁄ 32 (0.093) | 2.38 | 1 ⁄ 32 (0.031) | 0.79 |
| Over 12 | ± 1 % | |||
Hydrostatic Test
Each length of pipe shall be subjected to the hydrostatic test or nondestructive examination.
Mechanical Tests Required
Transverse or Longitudinal Tension Test and Flattening Test, Hardness Test, or Bend Test—For material heat treated in a batch-type furnace, tests shall be made on 5 % of the pipe from each treated lot.
For small lots, at least 1 pipe shall be tested. For material heat treated by the continuous process, tests shall be made on a sufficient number of pipe to constitute 5 % of the lot, but in no case less than 2 pipe.
Marking
In addition to the marking prescribed in Specification A 999/A 999M, the marking shall include the length, the ANSI schedule number and the heat number or manufacturer’s number by which the heat can be identified.
ASTM A335 P92 Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service,Application of ASTM A335 P92,Heat Treatment,Chemical Composition,Physical Properties.
Standard:ASTM A335/A 335M
Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
ASTM A335 P92 Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
P92 Steel
A335 P92 alloy tube, P92 material is American steel number ASTM A335 P92, which is martensitic heat-resistant steel.
92 steel is based on P91 steel, and the content of Mo element is appropriately reduced. At the same time, a certain amount of W is added to increase the molybdenum equivalent (Mo + 0.5W) of the material from 1% of P91 steel to about 1.5%. The steel is also added with a small amount of boron. After the above alloying improvement, compared with other commonly used heat-resistant steels of 9% Cr series, its high temperature corrosion resistance and oxidation resistance are similar, but the high temperature strength and creep performance are greatly improved. Improvement.
Compared with P91 steel, P92 steel has a 30% higher endurance strength at 600 ℃. In order to improve the thermal efficiency of modern coal-fired generating units, the generating units must be operated at higher temperature and pressure parameters, and a large number of P92 seamless steel pipes are required.
Manufacture:Seamless process ,Hot-finished or Cold-finished
Wall thickness(WT): 2.1mm——35 mm.
Outer diameter (OD): 23 mm——509mm
Common specifications:25mm*7mm, 141.3mm*6.55mm, 323.9mm*25.4mm,
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Threaded
Manufacture
ASTM A335 P91 Seamless Ferritic Alloy-Steel Pipe may be either hot finished or cold drawn with the finishing treatment.
ASTM A335 P92 Seamless Alloy Steel Pipe Chemical Composition(%)
| Grade | C | Mn | P | S | Si | Cr | Mo |
| A335 P91 | 0.07-0.13 | 0.3-0.6 | ≤0.02 | ≤0.01 | ≤0.5 | 8.5-9.5 | 00.3-0.6 |
| V | N | Ni | Al | Nb | W | B | |
| 0.15-0.25 | 0.03-0.07 | ≤0.4 | ≤0.04 | 0.04-0.09 | 1.5-2.0 | 0.001-0.006 |
ASTM A335 P92 Seamless Alloy Steel Pipe Mechanical & Physical Properties
| Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) |
| ≥620 | ≥440 | ≥20 |
Size Tolerances of ASTM A335 P92 Alloy Steel Pipe
Tolerance Of Outside Diameter
| ASTM A450 | Hot rolled | Outside Diameter(mm) | Tolerance(mm) |
| OD≤101.6 | +0.4 / -0.8 | ||
| 101.6＜OD≤190.5 | +0.4 / -1.2 | ||
| 190.5＜OD≤228.6 | +0.4 / -1.6 | ||
| Cold Drawn | OD＜25.4 | ±0.10 | |
| 25.4≤OD≤38.1 | ±0.15 | ||
| 38.1＜OD＜50.8 | ±0.20 | ||
| 50.8≤OD＜63.5 | ±0.25 | ||
| 63.5≤OD＜76.2 | ±0.30 | ||
| 76.2≤OD≤101.6 | ±0.38 | ||
| 101.6＜OD≤190.5 | +0.38 / -0.64 | ||
| 190.5＜OD≤228.6 | +0.38 / -1.14 | ||
| ASTM A530,ASTM A335 | NPS | Outside Diameter(inch) | Tolerance(mm) |
| 1/8≤OD≤1-1/2 | ±0.40 | ||
| 1-1/2＜OD≤4 | ±0.79 | ||
| 4＜OD≤8 | +1.59 / -0.79 | ||
| 8＜OD≤12 | +2.38 / -0.79 | ||
| 12＜OD | ±1% |
Tolerance Of Wall Thickness
| ASTM A450 | Hot rolled | Outside Diameter(mm) | Tolerance(%) |
| OD≤101.6,WT≤2.4 | +40 / -0 | ||
| OD≤101.6,2.4＜WT≤3.8 | +35 / -0 | ||
| OD≤101.6,3.8＜WT≤4.6 | +33 / -0 | ||
| OD≤101.6,4.6＜WT | +28 / -0 | ||
| 101.6＜OD,2.4＜WT≤3.8 | +35 / -0 | ||
| 101.6＜OD,3.8＜WT≤4.6 | +33 / -0 | ||
| 101.6＜OD,4.6＜WT | +28 / -0 | ||
| Cold Drawn | OD≤38.1 | +20 / -0 | |
| OD＞38.1 | +22 / -0 | ||
| ASTM A530 | NPS | Outside Diameter(inch) | Tolerance(%) |
| 1/8≤OD≤2-1/2 | +22 / -12.5 | ||
| 3≤OD≤18,WT/OD≤5% | +22.5 / -12.5 | ||
| 3≤OD≤18,WT/OD＞5% | +15 / -12.5 | ||
| 20≤OD,WT/OD≤5% | +22.5 / -12.5 | ||
| 20≤OD,WT/OD＞5% | +15 / -12.5 |
Tests Required
Hydrostatic Test
Transverse or Longitudinal Tension Test and Flatten- ing Test, Hardness Test, or Bend Test
Heat Treatment:
ASTM A335 P91 Seamless Ferritic Alloy-Steel Pipe shall be normalized at 1900°F [1040°C] minimum and tempered at 1350°F [730°C] minimum as a final heat treatment.
Application of ASTM A335 P92 Seamless Ferritic Alloy-Steel Pipe
A335 P92 Seamless Ferritic Alloy-Steel Pipes are widely used in high-temperature components such as main steam pipelines, reheater pipes and headers of ultra-supercritical thermal power generating units;
The use of A335 P92 Seamless Ferritic Alloy-Steel Pipes greatly reduces the wall thickness and structural weight of the pipeline, and improves the flexibility and effectiveness of the generator set.