ASTM A335 P5 Pipe is a seamless ferritic alloy steel pipe designed for high-temperature service in critical industrial systems. It conforms to ASTM A335/ASME SA335 specifications and is widely used in power generation, refineries, and petrochemical plants where both strength and corrosion resistance are essential.

The P5 grade contains 4.00–6.00% chromium and 0.45–0.65% molybdenum, delivering excellent resistance to oxidation, thermal fatigue, and chemical attack. This Chrome Moly Pipe is commonly used in boiler tubes, heat exchangers, and steam piping systems, where durability and elevated temperature performance are required.

The ASTM A335 P5 seamless pipe is available in cold-drawn or hot-finished conditions with optional heat treatment (annealed, normalized, tempered). Its seamless construction enhances structural integrity, making it a reliable choice under cyclic loading and thermal expansion conditions.

These pipes are available in outer diameters from 1/2” to 24” (DN15–DN600), with wall thickness from SCH 20 to XXH. Ends can be plain, beveled, or threaded as required. Surface treatments like varnishing, FBE, or 3LPE coatings are also available to improve corrosion resistance in harsh service environments.

With superior weldability and dimensional accuracy, P5 alloy steel pipe supports efficient fabrication and installation. Preheating and post-weld heat treatment (PWHT) are recommended to prevent cracking and ensure long-term operational safety.

Comparison of ASTM A335 P5 with Other Pipe Grades
Feature	ASTM A335 P5	ASTM A335 P9	ASTM A519 4140
Material Type	Alloy Steel	Alloy Steel	Alloy Steel
Chromium Content	4.00-6.00%	8.00-10.00%	0.80-1.10%
Molybdenum Content	0.45-0.65%	0.90-1.10%	0.15-0.25%
Temperature Range	High (up to 650°C)	High (up to 750°C)	Moderate to High
Corrosion Resistance	Good (With coatings)	Excellent (With coatings)	Good (With coatings)
Applications	Boilers, Refineries	Petrochemical, Power Plants	Gears, Shafts, Hydraulics
Tensile Strength (MPa)	415 (min)	415 (min)	655-862
Yield Strength (MPa)	205 (min)	205 (min)	415-690
Key Advantage	Balanced high-temp strength	Superior corrosion resistance	High strength and hardness

Chemical Composition of ASTM A335 P5 Seamless Pipe
Element	Composition (%)
Carbon (C)	≤0.15
Manganese (Mn)	0.30-0.60
Phosphorus (P)	≤0.025
Sulfur (S)	≤0.025
Silicon (Si)	≤0.50
Chromium (Cr)	4.00-6.00
Molybdenum (Mo)	0.45-0.65

Mechanical Properties of ASTM A335 P5 Seamless Pipe
Property	Value
Tensile Strength, min (MPa)	415
Yield Strength, min (MPa)	205
Elongation, min (%)	30
Hardness, max (HBW)	163

Key Benefits

High-Temperature Strength

Withstands temperatures up to 650°C for boilers and refineries.

Corrosion Resistance

High chromium content ensures resistance to oxidation and corrosion.

Creep Resistance

Molybdenum enhances durability in high-pressure systems.

Seamless Durability

Uniform construction ensures reliability in high-pressure applications.

Cost-Effective

Long lifespan reduces maintenance and replacement costs.

Versatile Applications

Ideal for boilers, refineries, and petrochemical systems.

ASTM A335 P5 & 1Cr5Mo Pipe Size List

Below is a detailed list of available pipe specifications, including outer diameter (O.D), wall thickness (W.T), length, and quantity.

Spec.	Grade	O.D mm	W.T mm	Length mm	Qty pcs
ASTM A335	P5	25	3	12000	12
ASTM A335	P5	32	3		16
GB9948	1Cr5Mo	48	5	8200	11
ASTM A335	P5	48.3	5.08	6000-12000	83
MAL 037	1Cr5Mo	60.3	5	6000-12000	48
ASTM A335	P5	60.3	5.6		3
MAL 037	1Cr5Mo	76	6	6000-12000	2
GB9948	1Cr5Mo	89	8	10000	9
ASTM A335	P5	101.6	5.74	10400	5
ASTM A335	P5	101.6	5.74	6000-12000	4
ASTM A335	P5	102	8	6000-12000	3
ASTM A335	P5	114.3	6	11800	12
ASTM A335	P5	114.3	6	6000-12000	5
GB9948	1Cr5Mo	114	7	6000-12000	9
GB9948	1Cr5Mo	114	8	8000	16
GB9948	1Cr5Mo	114.3	8.56	6000-12000	42
ASTM A335	P5	152	6.5	11000	4
ASTM A335	P5	152	6.5	6000-12000	2
GB9948	1Cr5Mo	152	8	6000-12000	5
JIS G3467	STFA25	152.4	10	12000	53
ASTM A335	P5	159	8		2
ASTM A335	P5	159	8
GB9948	1CR5MO	168	6	6000-12000	13
ASTM A335	P5	168	7	6000-12000	13
ASTM A335	P5	168.3	7.11	12000	44
ASTM A335	P5	168.3	7.11	6000-12000	7
ASTM A335	P5	168.3	7.11	28/259.85,20/166.28	58
ASTM A335	P5	168.3	7.11	12000	57
GB9948	1CR5MO	168	9.5		28
ASTM A335	P5	168.3	10.97
ASTM A335	P5	168.3	14.27		37
ASTM A335	P5	168.3	16		22
ASTM A335	P5	168.3	24	5000	2
ASTM A335	P5	219.1	8
ASTM A335	P5	219.1	8.18	6000	24
ASTM A335	P5	219.1	8.18	12000	37
ASTM A335	P5	219.1	10	9600	35
GB9948	1CR5MO	219	10		24
ASTM A335	P5	219.1	12		10
ASTM A335	P5	219.1	14
ASTM A335	P5	219.1	16
ASTM A335	P5	219.1	18
ASTM A335	P5	219.1	20		11
ASTM A335	P5	219.1	24
ASTM A335	P5	273	9		3
ASTM A335	P5	273.1	9.27		14
ASTM A335	P5	273.1	10		15
ASTM A335	P5	273.1	15.09		9
GB9948	1CR5MO	273	18		2
ASTM A335	P5	323.9	10.31	12000	10
ASTM A335	P5	325	12		2
ASTM A335	P5	355.6	27.79	8000	4
ASTM A335	P5	377	15		1
ASTM A335	P5	377	16		11
ASTM A335	P5	406	14		3
ASTM A335	P5	406.4	26.19	7000	5
ASTM A335	P5	406.4	30.96	6000	6
ASTM A335	P5	473	14		2
ASTM A335	P5	609.6	16		1
ASTM A335	P5	914	32		1

Chemical Composition of 1Cr5Mo (wt.%)
Element	C	Si	Mn	P	S	Cr	Mo	Ni
Content	≤ 0.15	≤ 0.50	≤ 0.60	≤ 0.035	≤ 0.030	4.00 – 6.00	0.45 – 0.60	≤ 0.60

Mechanical Properties of 1Cr5Mo (Quenched & Tempered)
Property	Value
Yield Strength, min (MPa)	390
Tensile Strength, min (MPa)	590
Elongation, min (%)	18
Alternative Range (MPa)	σ_y ≈ 411 MPa, σ_b = 579–716 MPa, Elongation = 13–72%

Physical & Thermal Properties of 1Cr5Mo
Property	Value
Density	~7.93 g/cm³
Thermal Conductivity	~67 – 73 W/m·K
Specific Heat	~450 J/kg·K
Electrical Resistivity	~0.50 – 0.60 µΩ·m
Thermal Expansion Coefficient	~13 × 10⁻⁶/K (20–100 °C)
Melting Point	~1400 – 1500 °C