ASTM A335 Gr P5 High Pressure Pipe

ASTM A335 Gr P5 High Pressure Pipe description

As a critical material widely used in petrochemical, power, and boiler applications under high-temperature and high-pressure conditions, the mechanical properties of ASTM A335 P5 alloy pipe directly determine equipment safety and service life. This chromium-molybdenum alloy steel pipe demonstrates significant advantages in high-temperature strength, creep resistance, and corrosion resistance due to its unique composition design and heat treatment processes.

At service temperatures above 538°C, ASTM A335 P5 outperforms ordinary carbon steel. Its high-temperature tensile strength remains at approximately 350 MPa at 600°C, far exceeding Q235 carbon steel's 120 MPa. More critically, its excellent creep resistance-with a steady-state creep rate as low as 1×10⁻⁸/h at 593°C under 100 MPa stress-is attributed to molybdenum's inhibition of grain boundary sliding. Practical data from a chemical plant shows that steam pipes made of this material exhibit a creep damage rate of only 0.2% after 50,000 hours of continuous operation at 565°C, well below the design allowable value. Additionally, its thermal fatigue performance is outstanding, with stable microstructure and no significant grain boundary cracks observed after 2,000 thermal shock cycles between 300-600°C.

 

A335 Gr P5 Seamless Pipe specification

Standard Grade : ASTM A335 / ASTM A213 / ASME SA335 Grade P5

Size : 1/2 to 36 Inch NB

Strength : Tensile strength, min, PSI, (MPA) – 60,000 (415) Yield Strength, min, (MPA) – 30,000 (205)

ASTM A335 P5 Pipes Materials : SCH 40, SCH 160, SCH 80, SCH XXS, SCH XS, All Schedules

Material Thickness:3 To 12 mm.

Class : ERW / Seamless / Welded / Fabricated

Tolerance : Cold drawn pipe: +/-0.1mm Cold rolled pipe: +/-0.05mm

Craft : Cold rolled and Cold drawn

Length : Standard Double & In Cut length also.

GR P5 Pipes Form : Round, Rectangular, Square, Hydraulic Etc

Ends : PE (Plain End), BE (Beveled Ends)

 

ASME SA335 P5 Round Pipe Mechanical And Physical Properties

Yield Strength, MPa	Tensile Strength, MPa	Elongation, %
205 min	415 min	30 min

Composition Chart of ASTM A335 Gr P5 High Pressure Pipe

Mo, %	Mn, %	Si, %	P, %	C, %	S, %	Cr, %
0.45-0.65	0.30-0.60	0.50 max	0.025 max	0.015 max	0.025 max	4.00-6.00

 

Test and inspection

Longitudinal Tension Test

Surface and dimension test

Flattening test

Bend Test

Flaring test

Hardness Test

Hydrostatic test as per ASTM A530

Non destructive test

 

Packaging and shipping