ASTM A335 Chrome Moly Pipe

ASTM A335 Chrome Moly Pipe

ASTM A335 Pipe (ASME S/A335, Chorme-Moly) is a seamless ferritic Alloy-Steel Pipe for high temperature service.

As a result, The chrome moly pipe finds high usage in power generation industry and petrochemical industry owing to its resistance to corrosion, tensile strength, strength for high temperature owing to its cost-effectiveness.

Sunny Steel Supply stocks a full range of the following A335 pipe grades:

Download ASTM A335 Chrome Moly Pipe

Main grades: ASTM A335 P5, P9, P11, P-22, and P91

Size range:

  • NPS 1/4'' to NPS 24''
  • Wall Thickness - Schedules 40 through 160, STD, XS, XXS.
  • Unscheduled heavy wall pipe thicknesses available up to 4 inches.

General Abbreviations of chrome moly pipe are chrome-moly, cro-moly, CrMo, CRMO, CR-MOLY.

Pipe ordered to this specification shall be suitable for bending, flanging (vanstoning), and similar forming operations, and for fusion welding. Sometimes referred to as “P Grade”, chome moly pipe is popular in P-Grades P5, P9, P11, P22, and P91.

ASTM A335 standard is issued under the fixed designation A 335/A 335M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.

The most common use of grades P11, P22, and P91 is in the power industry and petro-chemical plants, Grades P5 and P9 are commonly used in refineries.

ASTM A335 is often called as chrome moly pipe because of the chemical contain of Molybdenum (Mo) and Chromium (Cr). Molybdenum increases the strength of steel and Chromium (or chrome) is the essential constituent of stainless steel.

The composition chrome moly alloy steel pipe make it ideal for use in power plants, refineries, petro chemical plants, and oil field services where fluids and gases are transported at extremely high temperatures and pressures.

Certitifcation: Chrome Moly pipe are certified as PER DIN 50049 3.1, EN 10204 3.1/3.2 and NACE MR-0175 & NACE MR-0103

Piping Component Specifications:

Chemical Composition:

These pipe bear high resistance to rupture at high temperature and pressures. With hydrogen crack resistance and sulfide stress corrosion cracking chrome moly pipe are highly preferred over Carbon pipe.

Grade UN
S
equiv.
C≤ Mn P≤ S≤ Si≤ Cr Mo
P1 K11522 0.10-0.20 0.30-0.80 0.025 0.025 0.10-0.50 0.44-0.65
P2 K11547 0.10-0.20 0.30-0.61 0.025 0.025 0.10-0.30 0.50-0.81 0.44-0.65
P5 K41545 0.15 0.30-0.60 0.025 0.025 0.5 4.00-6.00 0.44-0.65
P5b K51545 0.15 0.30-0.60 0.025 0.025 1.00-2.00 4.00-6.00 0.44-0.65
P5c K41245 0.12 0.30-0.60 0.025 0.025 0.5 4.00-6.00 0.44-0.65
P9 S50400 0.15 0.30-0.60 0.025 0.025 0.50-1.00 8.00-10.00 0.44-0.65
P11 K11597 0.05-0.15 0.30-0.61 0.025 0.025 0.50-1.00 1.00-1.50 0.44-0.65
P12 K11562 0.05-0.15 0.30-0.60 0.025 0.025 0.5 0.80-1.25 0.44-0.65
P15 K11578 0.05-0.15 0.30-0.60 0.025 0.025 1.15-1.65 0.44-0.65
P21 K31545 0.05-0.15 0.30-0.60 0.025 0.025 0.5 2.65-3.35 0.80-1.60
P22 K21590 0.05-0.15 0.30-0.60 0.025 0.025 0.5 1.90-2.60 0.87-1.13
P91 K91560 0.08-0.12 0.30-0.60 0.02 0.01 0.20-0.50 8.00-9.50 0.85-1.05
P92 K92460 0.07-0.13 0.30-0.60 0.02 0.01 0.5 8.50-9.50 0.30-0.60

Chrome Moly Pipes: Werkstoff vs EN vs ASTM

Werkstoff /DIN EN ASTM
1.5415 16Mo3 A335 Grade P1
1.7335 13CrMo4-5 A335 Grade P11, P12
1.7380 10CrMo9-10 A335 Grade P22
1.7362 X11CrMo5 A335 Grade P5
A335 Grade P9
1.4903 X10CrMoVNb9-1 A335 Grade P91

Tensile Requirements

Tensile Strength, min., psi P-5P-9P-11P-22P-91
ksi6060606085
MPa415415415415585
Yield Strength, min., psi
ksi3030303060
MPa205205205205415

Note: P91 shall not have a hardness not exceeding 250 HB/265 HV [25HRC].

Mechanical Properties
Mechanical properties  Tensile strength  Yield strength
 P1,P2  380  205
 P12  415  220
 P23  510  400
 P91  585  415
 P92,P11  620  440
 P122  620  400

A335 is often called chrome moly pipe because of the chemical makeup of Molybdenum (Mo) and Chromium (Cr). Molybdenum increases the strength of steel as well as the elastic limit, resistance to wear, impact qualities, and hardenability. Moly increases the resistance to softening, restrains grain growth and makes chromium steel less susceptible to embrittlement. Moly is the most effective single additive that increases high temperature creep strength.

It also enhances the corrosion resistance of steel, and inhibits pitting. Chromium (or chrome) is the essential constituent of stainless steel. Any steel with 12% or more Chrome is considered stainless. Chrome is virtually irreplaceable in resisting oxidation at elevated temperatures. Chrome raises the tensile, yield, and hardness at room temperatures. The composition chrome moly alloy steel pipe make it ideal for use in power plants, refineries, petro chemical plants, and oil field services where fluids and gases are transported at extremely high temperatures and pressures.

Heat Treatment
A / N+T
N+T / Q+T
N+T

Material & Manufacture

Pipe may be either hot finished or cold drawn with the finishing heat treatment noted below.

Heat Treatment Requirements

Grade Heat Treatment Type
P5, P9, P11, and P22
Normalizing Temperature Range F [C] Subcritical Annealing or Tempering
Temperature Range F [C]
A335 P5 (b,c) Full or Isothermal Anneal
Normalize and Temper ***** 1250 [675]
Subcritical Anneal (P5c only) ***** 1325 – 1375 [715 - 745]
A335 P9 Full or Isothermal Anneal
Normalize and Temper ***** 1250 [675]
A335 P11 Full or Isothermal Anneal
Normalize and Temper ***** 1200 [650]
A335 P22 Full or Isothermal Anneal
Normalize and Temper ***** 1250 [675]
A335 P91 Normalize and Temper 1900-1975 [1040 - 1080] 1350-1470 [730 - 800]
Quench and Temper 1900-1975 [1040 - 1080] 1350-1470 [730 - 800]

Permissible Variation in Wall Thickness

NPS [DN] Designator Tolerance, % from Specified
Description 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)

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
Permissible Variations in Outside Diameter
Outside Diameter at any point shall not vary from standard specified more than:
NPS [DN] Designator Over Under
in. mm in. mm
1/8 to 1 1/2 [6 to 40], incl. 1/64 (0.015) 0.40 1/64 (0.015) 0.40
Over 1 1/2 to 4 [40 to 100], incl. 1/32 (0.031) 0.79 1/32 (0.031) 0.79
Over 4 to 8 [100 to 200], incl. 1/16 (0.062) 1.59 1/32 (0.031) 0.79
Over 8 to 12 [200 to 300], incl. 3/32 (0.093) 2.38 1/32 (0.031) 0.79
Over 12 [300] +/- 1% of the specified outside diameter

Ordering Information

Orders for material under this specification should include the following, as required, to describe the desired material adequately:

  1. Quantity (feet, metres, or number of lengths),
  2. Name of material (seamless alloy steel pipe),
  3. Grade (ASTM A335 P5, P9, P11, P-22, and P91)
  4. Manufacture (hot-fifinished or cold-drawn),
  5. Size useing in NPS & Schedule number, or OD (ID) and Wall thickness (minimum/nominal)
  6. Length (specifific or random),
  7. End fifinish (Ends Section of Specifification A999/A999M),
  8. Optional requirements (Hydrostatic Test Required or not and Permissible tolerance in weight.)
  9. Specifification designation, and Special requirements or any supplementary requirements selected, or both.

Mechanical Tests Specified

  • 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 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.

Notes for Hardness Test:

  • P91 shall not have a hardness not exceeding 250 HB/265 HV [25HRC].

Notes for Bend Test:

  • For pipe whose diameter exceeds NPS 25 and whose diameter to wall thickness ratio is 7.0 or less shall be subjected to the bend test instead of the flattening test.
  • Other pipe whose diameter equals or exceeds NPS 10 may be given the bend test in place of the flattening test subject to the approval of the purchaser.
    The bend test specimens shall be bent at room temperature through 180 without cracking on the outside of the bent portion.
Hydrostatic Test
  • The inside diameter of the bend shall be 1 inch [25 mm].
  • Each length of pipe shall be Hydro tested, at option of manufacture nondestructive electric testing can be used.

Applications:

Chrome moly pipe under ASTM & ASME specification A/SA 335 P1, P2, P11, P12, P15, P22, P91, P92, P122 are used for power industries whereas ASTM/ASME A/SA 335 P5, P9 are used for petrochemical industries

  • Strong resistance to rupturing at high temperatures and high pressures
  • May be used for Hydrogen Sulfide Corrosion Services
  • Resistant to cracking from hydrogen attack and embrittlement
  • Resistant to hot sulfide corrosion cracking
  • Can be used for NACE Applications where sour environments are under high temp and pressure
  • Can be used in NACE-MRO 175 Sour Service
  • Ideal for creep rupture applications
  • Can handle high temperatures with very low elasticity
Application
Referenced Documents

Chrome Moly Pipe
ASTM A335 Pipe is a seamless ferritic Alloy-Steel Pipe for high temperature service.
Low temperature pipe
ASTM A333 (ASME S/A-333) Pipe grades permit low temperature service.

Alloy steel specification, Standard and identification

Alloy Steel pipe contains substantial quantities of elements other than carbon such as nickel, chromium, silicon, manganese, tungsten, molybdenum, vanadium and limited amounts of other commonly accepted elements such as manganese, sulfur, silicon, and phosphorous.

ASTM A335 P11 alloy pipe