Manufacturer, stockist and supplier · Supplying GCC, Southeast Asia, Europe, United States, United Kingdom & India

ramesh@brighttubes.in · +91 98200 74585

Alloy Steel · Pipes · ASTM A335 P22

ASTM A335 P22 Pipes

In short: ASTM A335 P22 pipe (2¼Cr-1Mo) is the workhorse for steam, refinery heater and hydroprocessing lines up to about 565 °C, easier to fabricate than P91.

P22
Designation
7.85
density, g/cm³
3.1 / 3.2
EN 10204 certificates
5
P22 product forms
Quote ASTM A335 P22 →Sizes and weights
P22 pipe weight by sizeCalculated at 7.85 g/cm³: ½" 1.27 kg/m; ¾" 1.68 kg/m; 1" 2.50 kg/m; 1¼" 3.39 kg/m; 1½" 4.05 kg/m; 2" 5.44 kg/m; 2½" 8.64 kg/m; 3" 11.29 kg/m; 4" 16.08 kg/m; 6" 28.26 kg/m; 8" 42.55 kg/m; 10" 60.30 kg/m; 12" 79.72 kg/m. P22 pipe weight by size7.85 g/cm³ ½": 1.27 kg/m½"¾": 1.68 kg/m¾"1": 2.50 kg/m1"1¼": 3.39 kg/m1¼"1½": 4.05 kg/m1½"2": 5.44 kg/m2"2½": 8.64 kg/m2½"3": 11.29 kg/m3"4": 16.08 kg/m4"6": 28.26 kg/m6"8": 42.55 kg/m8"10": 60.30 kg/m10"12": 79.72 kg/m12" 79.7 NPS, Sch 40 · kg/m
Calculated values for estimating; actual weights vary within tolerances.

Why this combination

Why P22 in pipes

1.9–2.6% Cr, 0.87–1.13% MoHigher creep strength than P11Standard for hydroprocessing reactors (A387 Gr 22)Good hydrogen-attack resistance

P22 has decades of service history in power and refinery piping, and its fabrication and PWHT are well understood by most shops.

For higher temperatures or thinner walls, P91 is the step up; for hot hydrogen, follow API 941 guidance.

Specification

How to specify ASTM A335 P22

NPS ⅛" to 48" and larger (DN 6 – DN 1200+), schedules 5S to XXS, single random, double random and cut lengths

P22 pipe cross-section, NPS 6 Sch 40 Engineering drawing showing outside diameter 168.28 mm and wall thickness 7.11 mm (ASTM A335 P22 P22). Wall thickness is exaggerated for clarity. OD 168.28 mm WT 7.11 mm NPS 6SCH 40 ASTM A335 P22 P22
P22 pipes: ASTM A335 P22
Specification
ASTM A335 P22
Designation
ASTM A335 P22

Sizes and weights

ASTM A335 P22 sizes, weighed at 7.85 g/cm³

Other sizes on request. For general pipes information, such as manufacturing routes and end finishes, see the pipes guide.

P22 pipe: wall (mm) / weight (kg/m) at 7.85 g/cm³, ASME B36.10M
NPSOD mmSch 40Sch 80Sch 160XXS
½"21.342.77 / 1.273.73 / 1.624.78 / 1.957.47 / 2.56
¾"26.672.87 / 1.683.91 / 2.195.56 / 2.897.82 / 3.64
1"33.403.38 / 2.504.55 / 3.246.35 / 4.249.09 / 5.45
1¼"42.163.56 / 3.394.85 / 4.466.35 / 5.619.70 / 7.76
1½"48.263.68 / 4.055.08 / 5.417.14 / 7.2410.15 / 9.54
2"60.333.91 / 5.445.54 / 7.498.74 / 11.1211.07 / 13.45
2½"73.035.16 / 8.647.01 / 11.419.53 / 14.9214.02 / 20.40
3"88.905.49 / 11.297.62 / 15.2711.13 / 21.3515.24 / 27.68
4"114.306.02 / 16.088.56 / 22.3213.49 / 33.5417.12 / 41.03
6"168.287.11 / 28.2610.97 / 42.5618.26 / 67.5621.95 / 79.21
8"219.088.18 / 42.5512.70 / 64.6423.01 / 111.2622.23 / 107.92
10"273.059.27 / 60.3015.09 / 96.0028.58 / 172.3125.40 / 155.13
12"323.8510.31 / 79.7217.48 / 132.0733.32 / 238.7325.40 / 186.95

Chemistry

P22 composition

Density
7.85 g/cm³
P22 Alloy Steel (2¼% chromium-1% molybdenum) chemical composition, % (ASTM A335 (P22))
ElementLimit, %Why it matters
C0.05 – 0.15
Mn0.30 – 0.60
P0.025 max
S0.025 max
Si0.50 max
Cr1.90 – 2.60
Mo0.87 – 1.13

Limits per ASTM A335 (P22); other product forms and specifications differ slightly. Your order's specification and edition govern.

0%5%10% Cr Mo
Main alloying elements of P22 Alloy Steel (2¼% chromium-1% molybdenum): bars show the permitted range (ASTM A335 (P22)).

Questions

About ASTM A335 P22

P22 or P91 pipe?

P22 is easier to weld and fine at moderate steam conditions; P91 for higher temperatures and pressures.

Is P22 used in hydrogen service?

Yes, within limits set by API RP 941.

From enquiry to dispatch

How a ASTM A335 P22 order runs

  1. 01 EnquiryGrade, specification, size, quantity
  2. 02 ReviewChecked against your standard
  3. 03 InspectPMI, dimensions, TPI if required
  4. 04 CertifyEN 10204 3.1 / 3.2, heat traceable
  5. 05 ShipPacked and documented for the destination

Need ASTM A335 P22?

Send size, quantity, specification and destination. We reply with availability, certificates and delivery.

Request a quote →P22 grade page
Request a Quote Call
WhatsApp