ASTM A335 Chrome Moly Pipe ASTM A335 Seamless Ferritic Alloy-Steel Pipe for High-Temperature service . Pipe ordered to this specification shall be suitable for bending, flanging, and similar forming operations, and for fusion welding. Sometimes referred to as “P Grade”, chrome moly pipe is...
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ASTM A335 Seamless Ferritic Alloy-Steel Pipe for High-Temperature
service. Pipe ordered to this specification shall be suitable for bending,
flanging, and similar forming operations, and for fusion welding.
Sometimes referred to as “P Grade”, chrome moly pipe is popular in
P-Grades P5, P9, P11, P22, and P91. 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.
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.
Grades: P-5, P-9, P-11, P-22, and P-91
Sizes
NPS 1/4'' to NPS 48''
Wall Thickness - Schedules 10 through 160, STD, XS, XXS.
Unscheduled heavy wall pipe thicknesses available up to 4 inches.
|
Grade |
C |
Mn |
P |
S |
Si |
Cr |
Mo |
|
P5 |
0.15max |
0.30-0.60 |
0.025 |
0.025 |
0.50 max |
4.00-6.00 |
0.45-0.65 |
|
P9 |
0.15 max |
0.30-0.60 |
0.025 |
0.025 |
0.25-1.00 |
8.00-10.00 |
0.90-1.10 |
|
P11 |
0.05-0.15 |
0.30-0.60 |
0.025 |
0.025 |
0.50-1.00 |
1.00-1.50 |
0.44-0.65 |
|
P22 |
0.05-0.15 |
0.30-0.60 |
0.025 |
0.025 |
0.50 max |
1.90-2.60 |
0.87-1.13 |
|
P91 |
0.08-0.12 |
0.30-0.60 |
0.020 |
0.010 |
0.20-0.50 |
8.00-9.50 |
0.85-1.05 |
|
V 0.18-0.25 |
N 0.03-0.07 |
Ni 0.40 max |
Al 0.02 max |
Cb 0.06-0.10 |
Ti 0.01 max |
Zr 0.01 max |
Mechanical Properties
|
Grade P11, P22, P5, P9 |
Grade P91 |
|
|
Tensile strength, min, psi, (MPa) |
60,000 (415) |
85,000 (585) |
|
Yield strength, min, (MPa) |
30.000 (205) |
60,000 (415) |
(Note: This is summarized information from ASME Specification A335. Please refer to the specific Standard or Specification or contact us for more details.)
Permissible Variations in Diameter
For pipe ordered to NPS or outside diameter, variations outside diameter shall not exceed those specified following:
|
NPS Designator |
Over |
Under |
|
In.mm |
In.mm |
|
|
1⁄8to 11⁄2, incl. |
1⁄64 (0.015) 0.40 |
1⁄64 (0.015) 0.40 |
|
Over 11⁄2 to 4, incl. |
1⁄32 (0.031) 0.79 |
1⁄32 (0.031) 0.79 |
|
Over 4 to 8, incl. |
1⁄16 (0.062) 1.59 |
1⁄32 (0.031) 0.79 |
|
Over 8 to 12, incl. |
3⁄32 (0.093) 2.38 |
1⁄32 (0.031) 0.79 |
Over 12 6 1 % of the pacified outside
diameter
For pipe ordered to inside diameter, the inside diameter shall be not vary more
than ±1 % from the specified inside diameter.
Packing: Bare packing/bundle
packing/crate packing/wooden protection at the both sides of tubes and suitably
protected for sea-worthly delivery or as requested.
Inspection and Test: Chemical Composition Inspection, Mechanical
Properties Test(Tensile Strength, Yield Strength, Elongation, Flaring,
Flattening, Bending, Hardness, Impact Test), Surface and Dimension Test,
No-destructive Test, Hydrostatic Test.
Surface treatment: Oil-dip, Varnish, Passivation, Phosphating, Shot
Blasting.
Both ends of each crate will indicate the order no., heat no., dimensions,
weight and bundles or as requested.
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