ASTM A335 Grade P22 Alloy Steel Seamless Pipe

ASTM A335 P22 Pipe Specification

ASTM A335 Grade P22, commonly known in the industry as 2 ¼ Chrome, is a Seamless Ferritic Alloy-Steel P22 Pipe specifically engineered for high-temperature and high-pressure service. Identified by the UNS designation K21590, the ASTM A335 P22 Pipe Specification covers both nominal and minimum wall thicknesses. It is an essential material for critical industrial systems operating at temperatures exceeding 540°C, where standard carbon steel lacks the necessary structural integrity.

The unusual performance of ASTM A335 Grade P22 Alloy Pipe is prompted by its specific chemical make up which is mainly characterized by introduction of Chromium and Molybdenum. Chromium enhances strength in the high temperature, oxidation resistance and increases tensile and yield strength at room temperature. Molybdenum is used to improve the elastic limit and hardenability as well as being the most efficient additive to boost the high-temperature creep resistance. This alloy ensures that the SA 335 P22 chrome moly pipe is very resistant to pitting corrosion and minimizes the tendencies to embrittlement that high chromium levels have. 

In terms of mechanical performance, Alloy Steel P22 Pipes provide a robust balance of strength and durability. These pipes maintain a minimum tensile strength of 415 MPa and a minimum yield strength of 205 MPa, along with an elongation capacity of approximately 30%. These properties allow a335 p22 Pipes to withstand thermal cycling and pressure fluctuations in aggressive media. Furthermore, the material is highly versatile, offering excellent weldability and formability for complex operations such as bending, flanging, and vanstoning.

The manufacturing process for ASTM A335 Grade P22 Alloy Steel Seamless Pipe involves either hot finishing or cold drawing, followed by rigorous heat treatments. These treatments may include full or isothermal annealing, quenching, or normalizing and tempering to achieve the necessary mechanical stability. Because of its durability, the P22 Boiler Pipe is a primary choice for high-pressure steam pipelines in power generation. It is equally vital in refineries, petrochemical plants, and heavy industrial applications like heat exchangers and offshore oil drilling.

Seamless Ferritic Alloy Steel P22 Pipe, ASTM A335 Grade P22 Alloy Pipe, ASTM A335 Grade P22 Alloy Steel Seamless Pipe, Alloy Steel P22 Pipes, P22 Boiler Pipe & SA 335 P22 Chrome Moly Pipe Supplier & Manufacturer in India

Solitaire Overseas stands as a world-class supplier specializing in Chrome Alloy piping solutions. We maintain one of the industry's largest inventories of a335 p22 high energy pipes, heater tubes, fittings, flanges, and valves. Our stock encompasses a wide range from ½” NPS to 30” NPS, with wall thicknesses starting at STD and reaching up to 4” thick. We also provide material certified to ASTM/ASME A/SA 213 to meet the specialized equipment designs of modern power plants. Our commitment at Solitaire Overseas is to foster strong partnerships with our clients by offering expert technical support and highly competitive pricing for all high-pressure piping requirements.  

Table of Contents

ASTM A335 Grade P22 Alloy Pipe Specification

Specification Details
Grade P22
UNS K21590
Thickness 2.0 to 14 mm
Outer Dimensions (O.D.) 19.05 to 114.3 mm
Size of SA335 P22 Boiler Pipes (in Inch) 1/2 to 36” NB
Available Length  16000 mm or custom length
Schedule Chart Schedule 20 to SCH XXS (heavier wt on request) up to 280 mm thickness
Shapes Round, Rect., Square, Hydraulic or custom
Standard Specification ASTM A335 P22 and ASME SA 335 Grade P22 (with IBR Certificates)
Schedule SCH 40, SCH 80, SCH 160, SCH XS, SCH XXS, All Schedules
P22 material European, Japanese, Korean, USA, Russia, Indian (We don't stock China Material)
Tolerance chart Cold drawn P22 Pipes: +/-0.1mm Cold rolled P22 Pipes: +/-0.05mm
Manufacturing Process of P22 Pipes Cold rolled, Cold drawn, Cold finished, hot rolled
Types Seamless, EFW, ERW, Fabricated, Welded
Length Single Random (18 - 25 feet), Double Random (38 - 40 feet) & Cut to length as required
End Plain End, threaded and coupled, Beveled End, Treaded

ASTM A335 P22 Pipe Chemical Composition

Carbon, % P, % Mo, % Mn, % Si, % S, % Cr, %
00.015 max 00.025 max 00.87-1.13 00.30-0.61 00.50 max 00.025 max 1.90-2.60  

Mechanical Properties of ASTM A335 P22 Pipe

Tensile Stress, MPa Yield Stress, MPa Elongation, %
415 MPa minimum 205 MPa minimum 30 minimum

ASTM A335 P22 Pipe Equivalent Grades

American Society of Mechanical Engineers British Standard American Society for Testing and Materials International Organization for Standardization Deutsches Institut für Normung American Bureau of Shipping Japanese Industrial Standards G 3458 LRS Unified Numbering System
SA335 P22 3604 P1 622 A335 P22 2604 II TS34 17175 10CrMo910 ABS 13 STPA 24 Sec 2 2-1/4Cr1Mo410 K21590  

Heat Treatment Requirements of SA 335 P22 Chrome Moly Pipe

Grade Heat Treatment Type Normalizing Temperature Range F [C] Subcritical Annealing or Tempering Temperature Range F [C]
P22 Full or isothermal Anneal    
  Normalize and Temper ***** 1250 [675]

Elongation Requirements of ASTM A335 Grade P22 Alloy Pipe

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 Schedule Chart

Size in inch 5S S10 S20 S40 S60 S80 S120 S100 S140 S160
mm                  
1/2 1.7     2.77   3.73       4.78
1 1/4 1.7     3.56   4.85       6.35
3/4 1.7     2.87   3.91       5.56
1 1.7     3.38   4.55       6.35
2 1.7     3.91   5.54       9.74
1 1/2 1.7     3.68   5.08       7.14
4 2.1     6.02   8.56 11.1     13.5
5 2.8     6.55   9.53 12.7     15.9
10 3.4   6.4 9.27 12.7 15.1 21.4 19.3 25.4 28.6
12 4   6.4 10.3 14.3 17.5 25.4 21.4 28.6 33.3
18 4.2 6.4 7.9 14.3 19.1 23.8 34.9 29.4 39.7 45.2
20 4.8 6.4 9.5 15.1 20.6 26.2 38.1 32.5 44.5 50
26   7.9 13              
28   7.9 13              
34   7.9 13 17.5            
36   7.9 13 19.1            

Types of Alloy Steel A335 P22 Pipes

ASTM A335 P22 Seamless Pipe
ASTM A335 P22 Seamless Pipe
ASTM A335 P22 Welded Pipe
ASTM A335 P22 Welded Pipe
ASTM A335 P22 Rectangular Tube
ASTM A335 P22 Rectangular Tube
High Pressure P22 Boiler Pipe
High Pressure P22 Boiler Pipe
ASTM A335 P22 ERW Pipe
ASTM A335 P22 ERW Pipe
ASTM A335 P22 Schedule 60 Pipe
ASTM A335 P22 Schedule 60 Pipe
ASTM A335 P22 Alloy Steel Pipe
ASTM A335 P22 Alloy Steel Pipe
ASTM A335 P22 Square Pipe
ASTM A335 P22 Square Pipe
ASTM A335 grade P22 Pipes
ASTM A335 grade P22 Pipes
ASTM A335 P22 Square hollow section
ASTM A335 P22 Square hollow section
A335 P22 Pipe
A335 P22 Pipe
ASTM A335 P22 Schedule 40 Pipe
ASTM A335 P22 Schedule 40 Pipe

ASTM A335 P22 Alloy Steel Pipe Size Chart

O.D. x Thickness(mm) O.D x Thickness(mm) O.D x Thickness(mm)
38.1 x 3.2 57.0 x 4.9 76.2 x 4.0
38.1 x 4.0 57.0 x 6.3 76.2 x 5.0
38.1 x 6.3 57.0 x 7.9 76.2 x 6.3
42.4 x 3.2 60.3 x 3.2 82.5 x 4.5
42.4 x 4.0 60.3 x 3.6 88.9 x 3.2
44.5 x 3.2 60.3 x 5.0 88.9 x 3.6
44.5 x 6.3 63.5 x 3.2 88.9 x 4.0
48.3 x 3.2 63.5 x 3.6 101.6 x 3.6
48.3 x 3.6 63.5 x 4.0 101.6 x 4.5
50.8 x 4.5 63.5 x 6.3 101.6 x 6.3
51.0 x 3.2 63.5 x 7.9 114.3 x 3.6
51.0 x 3.6 70.0 x 3.2 114.3 x 5.0
51.0 x 6.3 70.0 x 3.6 139.7 x 4.0
57.0 x 3.2 70.0 x 6.3 139.7 x 5.0
57.0 x 3.6 76.2 x 3.6 139.7 x 6.3
NB Size OD 40S 5S 10S S10 S20 S40 S60 XS/80S S80 S100 S120 S140 S160 XXS
mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm
  1/8 10.29     1.2     1.73     2.41          
  1/4 13.72     1.7     2.24     3.02          
  3/8 17.15     1.7     2.31     3.2          
15 1/2 21.34 2.8 1.7 2.1     2.77   3.73 3.73       4.78 7.47
20 3/4 26.67 2.9 1.7 2.1     2.87   3.91 3.91       5.56 7.82
25 1 33.4 3.4 1.7 2.8     3.38   4.55 4.55       6.35 9.09
32 1 1/4 42.16 3.6 1.7 2.8     3.56   4.85 4.85       6.35 9.7
40 1 1/2 48.26 3.7 1.7 2.8     3.68   5.08 5.08       7.14 10.2
50 2 60.33 3.9 1.7 2.8     3.91   5.54 5.54       9.74 11.1
65 2 1/2 73.03 5.2 2.1 3.1     5.16   7.01 7.01       9.53 14
80 3 88.9 5.5 2.1 3.1     5.49   7.62 7.62       11.1 15.2
90 3 1/2 101.6 5.7 2.1 3.1     5.74   8.08 8.08          
100 4 114.3 6 2.1 3.1     6.02   8.56 8.56   11.1   13.5 17.1
125 5 141.3 6.6 2.8 3.4     6.55   9.53 9.53   12.7   15.9 19.1
150 6 168.3 7.1 2.8 3.4     7.11   10.97 11   14.3   18.3 22
200 8 219.1 8.2 2.8 3.8   6.4 8.18 10.3 12.7 12.7 15.1 19.3 20.6 23 22.2
250 10 273.1 9.3 3.4 4.2   6.4 9.27 12.7 12.7 15.1 19.3 21.4 25.4 28.6 25.4
300 12 323.9 9.5 4 4.6   6.4 10.3 14.3 12.7 17.5 21.4 25.4 28.6 33.3 25.4
350 14 355.6 9.5 4 4.8 6.4 7.9 11.1 15.1 12.7 19.1 23.8 27.8 31.8 35.7  
400 16 406.4 9.5 4.2 4.8 6.4 7.9 12.7 16.7 12.7 21.4 26.2 31 36.5 40.5  
450 18 457.2 9.5 4.2 4.8 6.4 7.9 14.3 19.1 12.7 23.8 29.4 34.9 39.7 45.2  
500 20 508 9.5 4.8 5.5 6.4 9.5 15.1 20.6 12.7 26.2 32.5 38.1 44.5 50  
550 22 558.8 9.5 4.8 5.5 6.4 9.5   22.2 12.7 28.6 34.9 41.3 47.6 54  
600 24 609.6 9.5 5.5 6.4 6.4 9.5 17.5 24.6 12.7 31 38.9 46 52.4 59.5  
650 26 660.4 9.5     7.9 13     12.7            
700 28 711.2 9.5     7.9 13     12.7            
750 30 762 9.5 6.4 7.9 7.9 13     12.7            
800 32 812.8 9.5     7.9 13 17.5   12.7            
850 34 863.6 9.5     7.9 13 17.5   12.7            
900 36 914.4 9.5     7.9 13 19.1   12.7            

ASTM A335 P22 IBR Pipe Surface Finish

Surface Finishes Bare, Mill Varnish, Oiled, Galv, FBE Dual, FBE, 3LPE, Coal Tar, 3LPP, Concrete Coating and Tape Wrap.
End Finishes Square Cut, Beveled, Threaded & Coupled.

SA335 P22 Round Pipe Tolerance Chart

ASTM A450 Hot rolled Outside Diameter, mm Tolerance, mm
Outer Diameter≤101.6 +0.4/-0.8
101.6<Outer Diameter≤190.5 +0.4/-1.2
190.5<Outer Diameter≤228.6 +0.4/-1.6
Cold Drawn Outside Diameter, mm Tolerance, mm
Outer Diameter<25.4 ±0.10
25.4≤Outer Diameter≤38.1 ±0.15
38.1<Outer Diameter<50.8 ±0.20
50.8≤Outer Diameter<63.5 ±0.25
63.5≤Outer Diameter<76.2 ±0.30
76.2≤Outer Diameter≤101.6 ±0.38
101.6<Outer Diameter≤190.5 +0.38/-0.64
190.5<Outer Diameter≤228.6 +0.38/-1.14
ASTM A530 & ASTM A335 NPS Outside Diameter, inch Tolerance, mm
1/8≤Outer Diameter≤1-1/2 ±0.40
1-1/2<Outer Diameter≤4 ±0.79
4<Outer Diameter≤8 +1.59/-0.79
8<Outer Diameter≤12 +2.38/-0.79
Outer Diameter>12 ±1%

SA 335 gr P22 High Pressure Pipe Size Chart

Outer Diameter * Thickness in MM Outer Diameter * Thickness in MM Outer Diameter * Thickness in MM
38.1 * 3.2 57.0 * 4.9 76.2 * 4.0
38.1 * 4.0 57.0 * 6.3 76.2 * 5.0
38.1 * 6.3 57.0 * 7.9 76.2 * 6.3
42.4 * 3.2 60.3 * 3.2 82.5 * 4.5
42.4 * 4.0 60.3 * 3.6 88.9 * 3.2
44.5 * 3.2 60.3 * 5.0 88.9 * 3.6
44.5 * 6.3 63.5 * 3.2 88.9 * 4.0
48.3 * 3.2 63.5 * 3.6 101.6 * 3.6
48.3 * 3.6 63.5 * 4.0 101.6 * 4.5
50.8 * 4.5 63.5 * 6.3 101.6 * 6.3
51.0 * 3.2 63.5 * 7.9 114.3 * 3.6
51.0 * 3.6 70.0 * 3.2 114.3 * 5.0
51.0 * 6.3 70.0 * 3.6 139.7 * 4.0
57.0 * 3.2 70.0 * 6.3 139.7 * 5.0
57.0 * 3.6 76.2 * 3.6 139.7 * 6.3

Standard Welding Procedures for SA 335 Gr P22

To ensure the structural integrity of ASTM A335 P22, specific thermal cycles and welding methods must be strictly followed:

  • Surface Preparation: Thorough cleaning of the weld zone to remove contaminants.
  • Preheating Phase: Maintain a temperature between 200°C and 300°C prior to welding.
  • Approved Welding Methods: SMAW (Shielded Metal Arc Welding), GTAW (Gas Tungsten Arc Welding), SAW (Submerged Arc Welding), and GMAW (Gas Metal Arc Welding).
  • Recommended Filler Metals: ER90S-B3 or E9018-B3.
  • Interpass Temperature Control: Maintain between 250°C and 350°C during the process.
  • Post-Weld Heat Treatment (PWHT): Mandatory heating between 690°C and 740°C to relieve residual stress.

SA 335 Grade P22 High Pressure Pipe Fabrication Processes

For high-pressure applications, the following process-filler combinations are utilized:

Welding Process Specified Filler Metal / Consumable
TIG (Tungsten Inert Gas) Union | CrMo 910
SAW (Submerged Arc) Union S1CrMo2 / UV 420 TTR
MAG (Massive Wire) Union | CrMo 910
Arc Welding (Manual) Phoenix SH Chromium 2KS
MAG (Cored Wire) Union MV CrMo - M21

Alloy Seamless P22 Pipe Applications

Due to its excellent creep resistance and high-temperature strength, P22 is the industry standard for:

Industrial Applications
  • Pharmaceutical equipment
  • Chemical equipment
  • Sea water equipment
  • Heat exchangers
  • Condensers
  • Pulp and paper industry
  • Off-shore oil drilling companies
  • Power generation
  • Petrochemicals
  • Gas processing
  • Specialty chemicals

Call us today to learn more about our Chrome Moly Alloy Seamless P22 Pipe inventory.

We Offer the best price of Alloy Seamless P22 Pipe

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Frequently Asked Questions About Alloy Steel P22 Pipes

ASTM A335 Grade P22 is a low-alloy carbon steel enhanced with chromium and molybdenum. These additives improve the metal’s hardness and strength, allowing it to resist oxidation and maintain its structural integrity even in extreme heat.

The main difference lies in the chemical makeup; P22 contains higher levels of chromium and molybdenum than P11. This richer alloy composition gives P22 superior performance and durability in high-temperature industrial environments.

P22 grade material is recognized globally and corresponds to several international standards. Common equivalents include EN 10216-2, ASTM/ASME A213 (tubing), GOST 550-75, and NBR 5603.

A335 P22 typically has a maximum hardness value of 163 HB. Despite its strength, the material remains highly ductile, making it easy to manufacture into various shapes like round, rectangular, or hydraulic pipes.

These pipes are built for extreme service and can operate continuously at temperatures ranging between 590°C and 600°C. Their high-temperature performance is further enhanced through specialized heat treatments like normalizing and tempering.

ASTM A335 Grade P22 Alloy Steel Seamless Pipe Weight Chart

Size NPS I.D. Pipe O.D. Standard Wall Thickness Weight per Foot Standard as per XXHY Schedule Chart Pipe Volume Gallon Capacity Per FT Section Modulus
1/2 0.622 0.84 0.109 0.85 STD 40 .0158 .0407
  0.546   0.147 1.09 XHY 80 .0122 .0478
  0.464   0.188 1.31   160 .0088 .0528
  0.252   0.294 1.72 XXHY   .0026 .0577
3/4 0.824 1.05 0.113 1.13 STD 40 .0277 .0705
  0.742   0.154 1.48 XHY 80 .0225 .0853
  0.612   0.219 1.95   160 .0153 .1006
  0.434   0.308 2.44 XXHY   .0077 .1103
1 1.049 1.315 0.133 1.68 STD 40 .0449 .1328
  0.957   0.179 2.17 XHY 80 .0374 .1606
  0.815   0.250 2.85   160 .0271 .1904
  0.599   0.358 3.66 XXHY   .0146 .2136
1 1/4 1.380 1.66 0.140 2.27 STD 40 .0777 .2346
  1.278   0.191 3.00 XHY 80 .0666 .2913
  1.160   0.250 3.77   160 .0549 .3421
  0.896   0.382 5.22     .0328 .4110
1 1/2 1.610 1.90 0.145 2.72 STD 40 .1058 .3262
  1.500   0.200 3.63 XHY 80 .0918 .4118
  1.338   0.281 4.86   160 .0730 .5079
  1.100   0.400 6.41     .0494 .5977
2 2.157 2.375 0.109 2.64   10 .1898 .4205
  2.067   0.154 3.66 STD 40 .1743 .5606
  1.939   0.218 5.03 XHY 80 .1534 .7309
  1.875   0.250 5.68     .1434 .8045
  1.813   0.281 6.29     .1344 .8666
  1.687   0.344 7.47   160 .1161 .9806
  1.503   0.436 9.04 XXHY   .0922 1.1043
2 1/2 2.635 2.875 0.120 3.53   10 .2833 .6870
  2.469   0.203 5.80 STD. 40 .2487 1.0640
  2.443   0.216 6.14     .2435 1.1169
  2.375   0.250 7.02     .2301 1.2468
  2.323   0.276 7.67 XHY 80 .2202 1.3386
  2.125   0.375 10.02   160 .1842 1.6371
  1.771   0.552 13.71 XXXHY   .1280 1.9971
3 3.260 3.50 0.120 4.34     .4336 1.0411
  3.188   0.156 5.58     .4147 1.3122
  3.156   0.172 6.12     .4064 1.4265
  3.124   0.188 6.66     .3984 1.5342
  3.068   0.216 7.58 STD. 40 .3840 1.7241
  3.000   0.250 8.69     .3672 1.9372
  2.938   0.281 9.67     .3521 2.1207
  2.900   0.300 10.26 XHY 80 .3431 2.2253
  2.624   0.438 14.34   160 .2811 2.8774
  2.300   0.600 18.6 XXHY   .2158 3.4243
3 1/2 3.760 4.0 0.120 4.98   10 .5768 1.3776
  3.548   0.226 9.12 STD. 140 .5136 2.3939
  3.500   0.250 10.02     .4998 2.6001
  3.438   0.281 11.17     .4821 2.8562
  3.364   0.318 12.52 XHY 80 .4617 3.1400
  2..728   0.636 22.87 XXHY   .3085 4.8795
4 4.260 4.5 0.120 5.62   10 .7404 1.7612
  4.188   0.156 7.24     .7156 2.2354
  4.124   0.188 8.67     .6942 2.6296
  4.094   0.203 9.32     .6838 2.8173
  4.062   0.219 10.02     .6725 3.0184
  4.026   0.237 10.80 STD. 40 .6613 3.2145
  4.000   0.250 11.36     .6528 3.3611
  3.938   0.281 12.67   60 .6326 3.7021
  3.876   0.312 13.97     .6126 4.0273
  3.826   0.337 15.00 XHY 80 .5972 4.2713
  3.624   0.438 19.02   120 .5361 5.1790
  3.438   0.531 22.53   160 .4822 5.8997
  3.152   0.674 27.57 XXHY   .4054 6.7927
5 5.187 5.563 0.188 10.80     1.0979 4.1161
  5.125   0.219 12.51     1.0716 4.7279
  5.047   0.258 14.63 STD. 40 1.0391 5.4500
  5.001   0.281 15.87     1.0204 5.8644
  4.939   0.312 17.51     .99647 6.4074
  4.875   0.344 19.19     .9696 6.9358
  4.813   0.375 20.80 XHY 80 .9449 7.4300
  4.563   0.500 27.06   120 .8495 9.2534
  4.313   0.625 32.99   160 .7590 10.7976
  4.063   0.750 38.59 XXHY   .6734 12.0954
6 6.407 6.625 0.109 7.59   5 1.6748 3.5769
  6.357   0.134 9.30   10 1.6488 4.3475
  6.313   0.156 10.79     1.6260 5.0107
  6.249   0.188 12.94     1.5937 5.9351
  6.219   0.203 13.94     1.5780 6.3804
  6.187   0.219 15.00     1.5620 6.8261
  6.125   0.250 17.04     1.5306 7.6905
  6.065   0.280 18.99 STD. 40 1.5008 8.4958
  6.001   0.312 21.06     1.4688 9.3416
  5.937   0.344 23.10     1.4391 10.111
  5.875   0.375 25.05     1.4082 10.893
  5.761   0.432 28.60 XHY 80 1.3541 12.224
  5.625   0.500 32.74     1.2909 13.711
  5.501   0.562 36.43   120 1.2346 14.9806
  5.375   0.625 40.09     1.1787 16.1821
  5.187   0.719 45.39   160 1.0977 17.8243
  4.897   0.864 53.21 XXHY   .9784 20.025
  4.625   1.000 60.13     .8727 21.7719
  4.375   1.125 66.14     .7809 23.1237