Grade P12 Pipe is chromium-molybdenum alloy steel seamless pipe that is known to provide optimal performance at high temperature and pressure operations. In addition, it is alternatively referred to as ASME SA335 P12 as per boiler code specifications. The P12 steel pipes find application in many sectors like power plants, oil refineries, and petrochemical plants where they can withstand extreme environmental conditions. The composition of the pipes includes chromium between 0.80–1.25 percent and 0.44–0.65 percent of molybdenum which gives the pipes optimal creep resistance, oxidation resistance, and corrosion resistance even at elevated temperatures. It needs proper heat treatment for attaining optimal mechanical properties, which include annealing and tempering treatments. At USA Piping Solution,, we provide many other different standards like ASTM A335 P12 Seamless pipes with all the relevant certifications and inspection services, together with other similar products that has been commonly used in different industries.
Specification of ASTM A335 P12 Pipe
| Feature | Specification Details |
|---|
| Specification | ASTM A335 / ASME SA335 |
| Grade | P12 |
| Type | Seamless Alloy Steel Pipe |
| Manufacturing Process | Hot Finished / Cold Drawn |
| Size Range | 1/2" NB to 24" NB |
| Wall Thickness | SCH 20 to SCH XXS |
| Standard | ANSI B36.10 |
| Length | Single Random, Double Random, Cut Length |
| End Finish | Plain End, Beveled End |
| Testing Protocols | Hydrostatic, Ultrasonic, IBR (Indian Boiler Reg.), NDT |
ASME SA335 P12 Pipe Chemical Composition
| Element | C | Cr | Mn | Mo | P | S | Si |
|---|
| Content | 0.05 - 0.15 | 1.00 - 1.50 | 0.30 - 0.60 | 0.44 - 0.65 | 0.025 max | 0.025 max | 0.50 - 1.00 |
Mechanical Properties of ASME SA335 P12 Pipe
| Property | Tensile Strength | Yield Strength | Elongation | Hardness |
|---|
| Value | 415 MPa (Min) | 205 MPa (Min) | 30% (Min) | As per ASTM standard |
ASME SA335 P12 Pipe Equivalent Grades
| ASTM | ASME | JIS | UNS | BS | DIN | ISO |
|---|
| A335 P12 | SA335 P12 | STPA 22 | K11562 | 3604 P1 620-440 | 17175 (13CrMo44) | 1Cr-1/2Mo |
P12 vs P11 vs P22 Pipe Comparison Chart
| Parameter | ASTM A335 P11 Pipe | ASTM A335 P12 Pipe | ASTM A335 P22 Pipe |
|---|
| Material Type | Cr-Mo Alloy Steel | Cr-Mo Alloy Steel | Higher Cr-Mo Alloy Steel |
| Chromium (Cr) | 1.00 - 1.50% | 0.80 - 1.25% | 2.00 - 2.50% |
| Molybdenum (Mo) | 0.44 - 0.65% | 0.44 - 0.65% | 0.87 - 1.13% |
| Temperature Resistance | Moderate to High | Moderate | High to Very High |
| Creep Strength | Good | Moderate | Excellent |
| Oxidation Resistance | Better than P12 | Moderate | Superior |
| Pressure Handling | High-pressure service | Medium to high pressure | Very high-pressure service |
| Typical Applications | Power plants, boilers, steam lines | Boilers, heat exchangers, general high-temp piping | Superheaters, high-pressure steam systems |
| Common Schedules | SCH 40, SCH 80, SCH 160 | SCH 40 to XXS | SCH 40 to XXS |
| Cost Level | Medium | Lower (cost-effective option) | Higher (premium grade) |
| Availability | High | High | Moderate |
| Best Use Case | Balanced performance for industrial piping | Budget-friendly option for moderate conditions | Critical high-temperature, high-pressure environments |
Wall Thickness Chart of ASTM A335 P12 Pipes
| NPS [DN] Designator | Wall Thickness Condition | Tolerance Over (%) | Tolerance Under (%) |
|---|
| 1/8 to 2 1/2 [6 to 65] | All t/D ratios | 20.0% | 12.5% |
| Above 2 1/2 [65] | t/D <= 5% | 22.5% | 12.5% |
| Above 2 1/2 [65] | t/D > 5% | 15.0% | 12.5% |
ASTM A335 P12 Pipe Size Chart
| OD x WT | OD x WT | OD x WT | OD x WT |
|---|
| 38.1 x 3.2 | 48.3 x 3.2 | 63.5 x 3.2 | 88.9 x 3.2 |
| 38.1 x 4.0 | 48.3 x 3.6 | 63.5 x 3.6 | 88.9 x 3.6 |
| 38.1 x 6.3 | 50.8 x 4.5 | 63.5 x 4.0 | 88.9 x 4.0 |
| 42.4 x 3.2 | 51.0 x 3.2 | 63.5 x 6.3 | 101.6 x 3.6 |
| 42.4 x 4.0 | 51.0 x 3.6 | 63.5 x 7.9 | 101.6 x 4.5 |
| 44.5 x 3.2 | 51.0 x 6.3 | 70.0 x 3.2 | 101.6 x 6.3 |
| 44.5 x 6.3 | 57.0 x 3.2 | 70.0 x 3.6 | 114.3 x 3.6 |
| 57.0 x 4.9 | 57.0 x 3.6 | 70.0 x 6.3 | 114.3 x 5.0 |
| 57.0 x 6.3 | 60.3 x 3.2 | 76.2 x 3.6 | 139.7 x 4.0 |
| 57.0 x 7.9 | 60.3 x 3.6 | 76.2 x 4.0 | 139.7 x 5.0 |
| 76.2 x 5.0 | 60.3 x 5.0 | 76.2 x 6.3 | 139.7 x 6.3 |
Weight Chart of ASME A335 P12 Pipe
| NPS (Size) | O.D. (in) | Wall Thickness (in) | I.D. (in) | Weight (lb/ft) | Schedule / Desig. | Sect. Modulus (in3) | Gal. Cap. (per ft) |
|---|
| 1/2 | 0.840 | 0.109 | 0.622 | 0.85 | STD (40) | 0.0407 | 0.0158 |
| 1/2 | 0.840 | 0.147 | 0.546 | 1.09 | XHY (80) | 0.0478 | 0.0122 |
| 1/2 | 0.840 | 0.188 | 0.464 | 1.31 | 160 | 0.0528 | 0.0088 |
| 1/2 | 0.840 | 0.294 | 0.252 | 1.72 | XXHY | 0.0577 | 0.0026 |
| 3/4 | 1.050 | 0.113 | 0.824 | 1.13 | STD (40) | 0.0705 | 0.0277 |
| 3/4 | 1.050 | 0.154 | 0.742 | 1.48 | XHY (80) | 0.0853 | 0.0225 |
| 3/4 | 1.050 | 0.308 | 0.434 | 2.44 | XXHY | 0.1103 | 0.0077 |
| 1 | 1.315 | 0.133 | 1.049 | 1.68 | STD (40) | 0.1328 | 0.0449 |
| 1 | 1.315 | 0.179 | 0.957 | 2.17 | XHY (80) | 0.1606 | 0.0374 |
| 1 | 1.315 | 0.358 | 0.599 | 3.66 | XXHY | 0.2136 | 0.0146 |
| 1 1/4 | 1.660 | 0.140 | 1.380 | 2.27 | STD (40) | 0.2346 | 0.0777 |
| 1 1/4 | 1.660 | 0.191 | 1.278 | 3.00 | XHY (80) | 0.2913 | 0.0666 |
| 1 1/4 | 1.660 | 0.382 | 0.896 | 5.22 | XXHY | 0.4110 | 0.0328 |
| 1 1/2 | 1.900 | 0.145 | 1.610 | 2.72 | STD (40) | 0.3262 | 0.1058 |
| 1 1/2 | 1.900 | 0.200 | 1.500 | 3.63 | XHY (80) | 0.4118 | 0.0918 |
| 1 1/2 | 1.900 | 0.400 | 1.100 | 6.41 | XXHY | 0.5977 | 0.0494 |
| 2 | 2.375 | 0.154 | 2.067 | 3.66 | STD (40) | 0.5606 | 0.1743 |
| 2 | 2.375 | 0.218 | 1.939 | 5.03 | XHY (80) | 0.7309 | 0.1534 |
| 2 | 2.375 | 0.436 | 1.503 | 9.04 | XXHY | 1.1043 | 0.0922 |
| 2 1/2 | 2.875 | 0.203 | 2.469 | 5.80 | STD (40) | 1.0640 | 0.2487 |
| 2 1/2 | 2.875 | 0.276 | 2.323 | 7.67 | XHY (80) | 1.3386 | 0.2202 |
| 2 1/2 | 2.875 | 0.552 | 1.771 | 13.71 | XXHY | 1.9970 | 0.1280 |
| 3 | 3.500 | 0.216 | 3.068 | 7.58 | STD (40) | 1.7240 | 1.3840 |
| 3 | 3.500 | 0.300 | 2.900 | 10.26 | XHY (80) | 2.2250 | 0.3431 |
| 3 | 3.500 | 0.600 | 2.300 | 18.60 | XXHY | 3.4240 | 0.2158 |
| 4 | 4.500 | 0.237 | 4.026 | 10.80 | STD (40) | 3.2140 | 0.6613 |
| 4 | 4.500 | 0.337 | 3.826 | 15.00 | XHY (80) | 4.2710 | 0.5972 |
| 4 | 4.500 | 0.674 | 3.152 | 27.57 | XXHY | 6.7920 | 0.4054 |
| 6 | 6.625 | 0.280 | 6.065 | 18.99 | STD (40) | 8.4958 | 1.5008 |
| 6 | 6.625 | 0.432 | 5.761 | 28.60 | XHY (80) | 12.2240 | 1.3541 |
| 6 | 6.625 | 0.864 | 4.897 | 53.21 | XXHY | 20.0200 | 0.9784 |
ASME A335 P12 Pipe Schedule-Wise Size Chart
| NB Size | OD (mm) | 5S | 10S | S20 | S40 / STD | S80 / XS | S160 | XXS |
|---|
| 1/8" | 10.29 | - | 1.20 | - | 1.73 | 2.41 | - | - |
| 1/4" | 13.72 | - | 1.70 | - | 2.24 | 3.02 | - | - |
| 3/8" | 17.15 | - | 1.70 | - | 2.31 | 3.20 | - | - |
| 1/2" | 21.34 | 1.70 | 2.10 | - | 2.77 | 3.73 | 4.78 | 7.47 |
| 3/4" | 26.67 | 1.70 | 2.10 | - | 2.87 | 3.91 | 5.56 | 7.82 |
| 1" | 33.40 | 1.70 | 2.80 | - | 3.38 | 4.55 | 6.35 | 9.09 |
| 1 1/4" | 42.16 | 1.70 | 2.80 | - | 3.56 | 4.85 | 6.35 | 9.70 |
| 1 1/2" | 48.26 | 1.70 | 2.80 | - | 3.68 | 5.08 | 7.14 | 10.20 |
| 2" | 60.33 | 1.70 | 2.80 | 3.90 | 3.91 | 5.54 | 8.74 | 11.10 |
| 2 1/2" | 73.03 | 2.10 | 3.10 | 5.16 | 7.01 | 7.01 | 9.53 | 14.00 |
| 3" | 88.90 | 2.10 | 3.10 | - | 5.49 | 7.62 | 11.10 | 15.20 |
| 4" | 114.30 | 2.10 | 3.10 | 6.00 | 6.02 | 8.56 | 13.50 | 17.10 |
| 6" | 168.30 | 2.80 | 3.40 | 7.11 | 7.11 | 10.97 | 18.30 | 22.00 |
| 8" | 219.10 | 2.80 | 3.80 | 6.40 | 8.18 | 12.70 | 23.00 | 22.20 |
| 10" | 273.10 | 3.40 | 4.20 | 6.40 | 9.27 | 12.70 | 28.60 | 25.40 |
| 12" | 323.90 | 4.00 | 4.60 | 6.40 | 10.31 | 12.70 | 33.30 | 25.40 |
| 14" | 355.60 | 4.00 | 4.80 | 6.40 | 11.10 | 12.70 | 35.70 | - |
| 16" | 406.40 | 4.20 | 4.80 | 6.40 | 12.70 | 12.70 | 40.50 | - |
| 20" | 508.00 | 4.80 | 5.50 | 6.40 | 15.10 | 12.70 | 50.00 | - |
| 24" | 609.60 | 5.50 | 6.40 | 6.40 | 17.50 | 12.70 | 59.50 | - |
| 36" | 914.40 | - | 7.90 | - | 19.10 | 12.70 | - | - |
Application Usage of ASME A335 P12 Pipe
- Oil & gas refineries
- Petrochemical industries
- Chemical processing plants
- Energy and utility sectors
- Engineering & EPC projects
- Heavy industrial manufacturing
Related Alloy Steel Pipe Grades
What is SA 335 P12 material?
SA 335 P12 is a chromium-molybdenum (Cr-Mo) alloy steel used for high-temperature and high-pressure piping applications, mainly in boilers and power plants.
What is the difference between P11 and P12 material?
P11 has slightly higher chromium content (1.0-1.5%) compared to P12 (0.80-1.25%), giving P11 better oxidation resistance, while P12 is more cost-effective for moderate temperature service.
Where is ASTM A335 P12 pipe used?
It is used in power plants, boilers, heat exchangers, refineries, petrochemical plants, and high-pressure steam pipelines.
What is the equivalent grade of P12 pipe?
Common equivalents include EN 10216-2 13CrMo4-5 (1.7335) and ASME SA335 P12.
Is P12 pipe suitable for high-pressure applications?
Yes, P12 pipe is suitable for high-pressure and elevated temperature applications, especially in steam and process piping systems.
