A335 P22 is a high-temperature ferritic steel with 2.25% Cr and 1% Mo, as defined in the ASTM A335 standard for alloy seamless pipes. It has good high-temperature, corrosion, and pressure resistance. It also has good processing and welding properties and high thermal strength. When the temperature is less than or equal to 580°C, its creep rupture strength and allowable stress even exceed those of 9Cr – Mo steel. It is primarily used in the manufacturing of high-temperature and high-pressure pipelines and equipment. It is widely applied in industries such as chemical, petroleum, natural gas, thermal power generation, and nuclear power.
Zizi Engineering Co. Ltd. has strong technical capabilities, advanced production equipment, and comprehensive testing methods. We have a full – fledged seamless steel pipe production line and a range of professional testing equipment, including water immersion ultrasonic flaw detectors, eddy current flaw detectors, hydraulic presses, chemical labs, and direct reading spectrometers. We specialize in manufacturing steel pipes meeting standards such as ASTM335, ASTM A213, ASTM A312, ASTM A269, GIS 3459, EN 10216 – 5. Our products include special materials such as alloys, austenitic steels, and duplex steels. Our products are highly praised by domestic and international users and are exported to many countries and regions in Europe, the Americas, Africa, and Southeast Asia. Feel free to contact us.
ASTM A335 Standard Scope
The ASTM A335 standard is applicable to seamless ferritic alloy steel pipes used in high-temperature service. It specifies the nominal and minimum wall thicknesses, and requires that the pipes can adapt to forming operations such as bending and flanging, as well as fusion welding. It covers various grades of low and medium alloy ferritic steels with a chromium content not exceeding 10%. There are optional supplementary requirements (S1 to S8). In the standard, the values in the International System of Units (SI) and inch-pound units are respectively regarded as the standards and need to be used independently. When “M” is not specified, inch-pound units shall be adopted. This standard is formulated in accordance with the relevant principles of the Technical Barriers to Trade (TBT) Committee of the World Trade Organization.
ASTM A335 P22 Pipe Specification
Product name: Astm a335 p22 pipe, Asme a335 p22 pipe
Type: Seamless/fabricated
Standard: ASTM A335, ASME SA335
Sizes: 1/2” to 24”
Wall thickness: SCH 20 – 160, XXS
Length: 6 meters, 12 meters or customized.
Manufacturing: Seamless production, either hot – finished or cold – finished.
Ends: Plain End, Beveled End, Treaded
ASTM A335 P22 Pipe Chemical Composition
| CHEMICAL | LIMITS | C | Mn | P | S | Si | Cr | Mo |
| ASTM A335 P22 | MIN | 0.05 | 0.30 | 1.90 | 0.87 | |||
| MAX | 0.15 | 0.60 | 0.025 | 0.025 | 0.50 | 2.60 | 1.13 |
ASTM A335 P22 Pipe Mechanical Properties
| MATERIAL | ASTM A335 P22 |
| T.S (MPA) | 415 min |
| Y.S (MPA) | 205 min |
| EL % | 30 min |
ASTM A335 P22 Equivalent
| ASTM | ASME | A335 P22 Equivalent Material | JIS G 3458 | UNS | BS | DIN | ISO | ABS | NK | LRS |
| A335 P22 | SA335 P22 | T22, 10CrMo910, 10CrMo9-10, 1.7380, 11CrMo9-10, 1.7383 | STPA 24 | K21590 | 3604 P1 622 | 17175 10CrMo910 | 2604 II TS34 | ABS 13 | KSTPA 24 | Sec 2 2-1/4Cr1Mo410 |
ASTM A335 Gr P22 is equivalent to several international standards, including EN 10216-2, ASTM A213, ASME SA213, GOST 550-75, and NBR 5603.
ASTM A335 P22 Pipe Heat Treatment
| ASTM A335 Grade | Heat Treatment Type | Normalizing Temperature Range F [C] | Subcritical Annealing or Tempering Temperature Range F [C] |
| P5 (b,c) | Full or Isothermal Anneal | ||
| Normalize and Temper | – | 1250 [675] | |
| Subcritical Anneal (P5c only) | – | 1325 – 1375 [715 – 745] | |
| P9 | Full or Isothermal Anneal | ||
| Normalize and Temper | – | 1250 [675] | |
| P11 | Full or Isothermal Anneal | ||
| Normalize and Temper | – | 1200 [650] | |
| P22 | Full or Isothermal Anneal | ||
| Normalize and Temper | – | 1250 [675] | |
| P91 | Normalize and Temper | 1900-1975 [1040 – 1080] | 1350-1470 [730 – 800] |
| Quench and Temper | 1900-1975 [1040 – 1080] | 1350-1470 [730 – 800] |
ASTM A335 P22 Pipe Permissible Variation 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 | 20.0% | 12.5% |
| Above 2 1/2 [65], t/D < or = 5% | 22.5% | 12.5% |
| Above 2 1/2 [65], t/D > 5% | 15.0% | 12.5% |
| (t = Specified Wall Thickness; D = Specified Outside Diameter) | ||
ASTM A335 P22 Pipe Elongation Requirements
| Calculated Minimum Elongation Values | ||||
| Elongation in 2 in. or 50 mm, min % | ||||
| Wall Thickness | P5, P9, P11, P22 | P91 | ||
| in. | mm | Longitudinal | Transverse | Longitudinal |
| 5/16 (0.312) | 8 | 30 | 20 | 20 |
| 9/32 (0.281) | 7.2 | 28 | 19 | 19 |
| 1/4 (0.250) | 6.4 | 27 | 18 | 18 |
| 7/32 (0.219) | 5.6 | 26 | 17 | |
| 3/16 (0.188) | 4.8 | 24 | 16 | |
| 5/32 (0.156) | 4 | 22 | 15 | |
| 7/8 (0.125) | 3.2 | 21 | 14 | |
| 3/32 (0.094) | 2.4 | 20 | 13 | |
| 1/18 (0.062) | 1.6 | 18 | 12 | |
ASTM A335 P22 Pipe Outside Diameter Tolerance
| 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 | Outside Diameter, mm | Tolerance, mm | |
| 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 | ||
| OD>12 | ±1% |
Comparison of P22 and T22 Alloy Seamless Steel Pipe
P22 is specified by ASTM SA335 for seamless alloy-steel pipes used in high-temperature environments, while T22 follows ASTM SA213, which is for seamless alloy-steel tubes used in boilers and heat exchangers. P22 alloy seamless steel pipe that we produce is used for connecting pipes, while T22 seamless steel pipe is used for boiler heating surfaces in contact with flue gases. Both are equivalent to the German grade 10CrMo910. Both P22 and T22 have similar chemical compositions: C (0.05~0.15), Si (≤0.50), Mn (0.30~0.60), P (≤0.025), S (≤0.025), Cr (1.90~2.60), and Mo (0.87~1.13). We specialize in manufacturing a wide range of high-quality alloy seamless steel pipes, including grades such as P5, P11, P12, P22, P91, and more. In addition, we produce various pipe fittings, including flanges, elbows, bends, and tees. Our products are fully customizable in both material composition and size, ensuring they meet the specific and diverse requirements of our customers. Feel free to contact us.
ASTM A335 P22 Pipe Mechanical Tests Specified
Transverse or Longitudinal Tension Test, Hardness Test, and Flattening 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 one 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.
ASTM A335 P22 Pipe Hydrostatic Test
Each length of pipe shall be subjected to the hydrostatic test or nondestructive examination, as required by the relevant specifications.
