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As a leading supplier of high-performance industrial materials, we provide ASTM A335 P5 Pipe (also known as ASME SA335 P5), a premium chromium-molybdenum alloy seamless pipe specifically engineered for demanding high-temperature and corrosive service. With a robust chemical composition of 4.00%–6.00% Chromium and 0.45%–0.65% Molybdenum, this grade delivers exceptional oxidation resistance, improved creep strength, and long-term structural stability in critical applications. Widely used in power generation boilers, petrochemical plants, and heat exchangers, P5 Chrome Moly Pipe is available in both seamless form per ASTM A335 and as ASTM A691 5CR welded pipe from A387 Gr 5 plate, ensuring a reliable and compatible solution for your most challenging piping systems.
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Products Description
ASTM A335 / ASME SA335 pipes, commonly known as chrome-moly pipes, derive their exceptional properties from a strategic blend of Chromium (Cr) and Molybdenum (Mo).
Chromium Enhancement: Significantly boosts oxidation resistance and high-temperature strength, while also improving tensile strength, yield strength, and hardness at ambient temperatures.
Molybdenum Contribution: Increases overall strength, hardenability, and resistance to softening. It also refines the material's grain structure, enhancing toughness and reducing brittleness.
With a minimum tensile strength of 415 MPa and a minimum yield strength of 205 MPa-a performance benchmark shared by popular grades like P5, P9, P11, and P22-this material family offers a reliable and versatile solution for demanding applications across power generation, petrochemical, and other critical industries.
Products Specification
| Specification | Details |
|---|---|
| Standard | ASTM A335 / ASME SA335 |
| Grades | P5, P5B, P5C |
| UNS No. | K41545 (for P5 & P5C); K41245 (for P5B) |
| Trade Names | Chrome Moly P5 Pipe, 5Cr-0.5Mo Pipe, P5 Ferritic Alloy Steel Pipe |
| Manufacturing Process | Seamless (Hot Finished / Cold Drawn) |
| Sizes (NPS) | ½" NB to 24" NB (Nominal Bore); Specialized in Large Diameter Sizes |
| Outer Dimensions (OD) | 19.05 mm – 114.3 mm (and larger as per NPS) |
| Wall Thickness (Schedule) | SCH 20, SCH 40, SCH STD, SCH 80, SCH XS, SCH 160, XXS (up to 250mm thk.) |
| Length | Single Random (SRL), Double Random (DRL), Cut to Length (up to max 16000 mm) |
| Ends | Plain End (PE), Beveled Ends (BE), Threaded |
| Surface Treatment | Polished, Varnished, Black Painting, Anti-corrosion Oil, 3PE Coating, FBE Coating |
| Pipe Form | Round, Rectangular, Square, Hydraulic, etc. |
ASTM A335 P5 Pipe Material Chemical Composition
| Element | P5 (%) | P5B (%) | P5C (%) |
|---|---|---|---|
| Carbon (C) | 0.05–0.15 | 0.05–0.15 | 0.12 max |
| Manganese (Mn) | 0.30–0.60 | 0.30–0.60 | 0.30–0.60 |
| Phosphorus (P), max | 0.025 | 0.025 | 0.025 |
| Sulfur (S), max | 0.025 | 0.025 | 0.025 |
| Silicon (Si) | 0.50–1.00 | 0.50–1.00 | 0.50–1.00 |
| Chromium (Cr) | 4.00–6.00 | 4.00–6.00 | 4.00–6.00 |
| Molybdenum (Mo) | 0.45–0.65 | 0.45–0.65 | 0.45–0.65 |
| Vanadium (V) | – | 0.20–0.30 | – |
ASTM A335 P5 Pipe Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength, min | 60,000 psi (415 MPa) |
| Yield Strength, min | 30,000 psi (205 MPa) |
| Elongation (Longitudinal), min | 30% |
| Elongation (Transverse), min | 20% |
| Hardness, max | 250 HB / 265 HV |
ASME SA 335 Grade P5 ERW Pipe Schedule
| O.D. x Thickness(mm) | O.D x Thickness(mm) | O.D x Thickness(mm) |
|---|---|---|
| 38.1 x 3.2 | 57.0 x 4.9 | 76.2 x 4.0 |
| 38.1 x 4.0 | 57.0 x 6.3 | 76.2 x 5.0 |
| 38.1 x 6.3 | 57.0 x 7.9 | 76.2 x 6.3 |
| 42.4 x 3.2 | 60.3 x 3.2 | 82.5 x 4.5 |
| 42.4 x 4.0 | 60.3 x 3.6 | 88.9 x 3.2 |
| 44.5 x 3.2 | 60.3 x 5.0 | 88.9 x 3.6 |
| 44.5 x 6.3 | 63.5 x 3.2 | 88.9 x 4.0 |
| 48.3 x 3.2 | 63.5 x 3.6 | 101.6 x 3.6 |
| 48.3 x 3.6 | 63.5 x 4.0 | 101.6 x 4.5 |
| 50.8 x 4.5 | 63.5 x 6.3 | 101.6 x 6.3 |
| 51.0 x 3.2 | 63.5 x 7.9 | 114.3 x 3.6 |
| 51.0 x 3.6 | 70.0 x 3.2 | 114.3 x 5.0 |
| 51.0 x 6.3 | 70.0 x 3.6 | 139.7 x 4.0 |
| 57.0 x 3.2 | 70.0 x 6.3 | 139.7 x 5.0 |
| 57.0 x 3.6 | 76.2 x 3.6 | 139.7 x 6.3 |
ASTM A335 P5 Pipe Sizes In Mm
| ASTM A335 P5 Seamless Pipe OD mm |
Pipe WT mm |
in. | Sch | Kg/m |
|---|---|---|---|---|
| 13.72 | 1.65 | 1/4 | 10S | 0.50 |
| 13.72 | 2.24 | 1/4 | 40S | 0.64 |
| 13.72 | 3.02 | 1/4 | 80S | 0.81 |
| 17.15 | 1.65 | 3/8 | 10S | 0.64 |
| 17.15 | 2.31 | 3/8 | 40S | 0.86 |
| 17.15 | 3.20 | 3/8 | 80S | 1.12 |
| 21.34 | 2.11 | 1/2 | 10S | 1.02 |
| 21.34 | 2.77 | 1/2 | 40S | 1.29 |
| 21.34 | 3.73 | 1/2 | 80S | 1.65 |
| 26.67 | 2.11 | 3/4 | 10S | 1.30 |
| 26.67 | 2.87 | 3/4 | 40S | 1.71 |
| 26.67 | 3.91 | 3/4 | 80S | 2.23 |
| 33.40 | 2.77 | 1 | 10S | 2.13 |
| 33.40 | 3.38 | 1 | 40S | 2.54 |
| 33.40 | 4.55 | 1 | 80S | 3.29 |
| 33.40 | 6.352) | 1 | 160 | 4.30 |
| 42.16 | 2.77 | 1¼ | 10S | 2.73 |
| 42.16 | 3.56 | 1¼ | 40S | 3.44 |
| 42.16 | 4.85 | 1¼ | 80S | 4.53 |
| 42.16 | 6.352) | 1¼ | 160 | 5.69 |
| 48.26 | 2.77 | 1½ | 10S | 3.16 |
| 48.26 | 3.68 | 1½ | 40S | 4.11 |
| 48.26 | 5.08 | 1½ | 80S | 5.49 |
| 60.33 | 2.77 | 2 | 10S | 3.99 |
| 60.33 | 3.91 | 2 | 40S | 5.52 |
| 60.33 | 5.54 | 2 | 80S | 7.60 |
| 60.33 | 8.742) | 2 | 160 | 11.29 |
| 73.03 | 3.05 | 2½ | 10S | 5.35 |
| 73.03 | 5.16 | 2½ | 40S | 8.77 |
| 73.03 | 7.01 | 2½ | 80S | 11.59 |
| 88.90 | 3.05 | 3 | 10S | 6.56 |
| 88.90 | 5.49 | 3 | 40S | 11.47 |
| 88.90 | 7.62 | 3 | 80S | 15.51 |
| 88.90 | 11.132) | 3 | 160 | 21.67 |
| 101.60 | 3.05 | 3½ | 10S | 7.53 |
| 101.60 | 5.74 | 3½ | 40S | 13.78 |
| 101.60 | 8.08 | 3½ | 80S | 18.92 |
| 114.30 | 3.05 | 4 | 10S | 8.50 |
| 114.30 | 6.02 | 4 | 40S | 16.32 |
| 114.30 | 8.56 | 4 | 80S | 22.67 |
| 114.30 | 13.492) | 4 | 160 | 34.05 |
| 141.30 | 6.55 | 5 | 40S | 22.10 |
| 141.30 | 9.53 | 5 | 80S | 31.44 |
| 141.30 | 15.882) | 5 | 160 | 49.87 |
| 168.28 | 3.4 | 6 | 10S | 14.04 |
| 168.28 | 7.11 | 6 | 40S | 28.69 |
| 168.28 | 10.97 | 6 | 80S | 43.21 |
| 168.28 | 14.27 | 6 | 120 | 54.75 |
| 168.28 | 18.262) | 6 | 160 | 68.59 |
| 219.08 | 8.18 | 8 | 40S | 43.20 |
| 219.08 | 12.7 | 8 | 80S | 65.63 |
| 219.08 | 18.23 | 8 | 120 | 91.30 |
| 219.08 | 23.012) | 8 | 160 | 112.97 |
p5 Alloy Steel Pipes Thickness Chart
| NPS [DN] Designator | Tolerance, % from Specified | |
|---|---|---|
| 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) | ||
Stockist of ASTM A335 P5 Pipe
| ASME SA335 Grade P5 Material | ASME SA335 P5 Rolled Pipes |
| SA335 Grade P5 Drill Pipes | Alloy Steel P5 Seamless Pipes |
| SA335 P5 IBR Pipes Line | Alloy Steel A335 P5 Erw Pipes |
| ASME SA335 Grade P5 Pipes | IBR Alloy Steel ASME SA335 GR P5 Pipes |
| ASTM A335 Grade P5 Seamless Pipes | Alloy Steel P5 IBR Grade Pipes |
| ASTM P5 Grade Steel Welded Pipes | ASTM A335 P5 Boiler Pipes |
| ASTM A335 GR P5 Erw Pipes | SA335 P5 Used Pipes |
| ASTM A335 P5 Alloy Steel Boiler Pipes | ASTM A335 Grade P5 High Pressure Pipes |
| P5 Alloy Steel Pipe Material | P5 Grade Steel Pipes |
| Steel Grade P5 High Pressure Pipes | ASME SA335 P5 IBR Steam Pipe Line |
| ASTM A335 P5 Piping Material | Alloy Steel P5 Welded Pipes |
| ASME SA335 Grade P5 Rolled Pipes | ASTM A335 GR P5 Round Pipes |
Frequently Asked Questions (FAQ): ASTM A335 P5 / ASME SA335 P5 Chromium-Molybdenum Alloy Seamless Pipe
Q1: What is the primary application advantage of A335 P5 over lower-grade alloys like P11 or P22?
A: The key advantage is its significantly higher Chromium content (4-6%). This provides vastly superior resistance to oxidation (scaling) and corrosion in high-temperature environments, such as those involving sulfurous atmospheres in refinery heaters or certain chemical processes. While P11 and P22 are strong, P5 is specified when the service environment is too corrosive for those lower-chromium grades.
Q2: What are the specific chemical composition and mechanical properties of A335 P5 pipe?
A:
Chemical Composition:
Chromium (Cr): 4.00% - 6.00%
Molybdenum (Mo): 0.45% - 0.65%
Carbon (C): 0.15% max
Mechanical Properties (Minimum):
Tensile Strength: 415 MPa (60,000 psi)
Yield Strength: 205 MPa (30,000 psi)
Q3: We need to source matching fittings and flanges for a P5 piping system. What are the correct standards?
A: For a fully compatible P5 system, specify the following:
Pipe Fittings (Elbows, Tees, Reducers): ASTM A234 WP5
Flanges & Forged Fittings: ASTM A182 F5
Equivalent Steel Plate for Fabrication: ASTM A387 Grade 5
Q4: What is the difference between seamless A335 P5 and welded A691 5CR pipe?
A: Both share the same chemical base material but differ in manufacture:
ASTM A335 P5: A seamless pipe, manufactured by piercing a solid billet. It is the default choice for high-pressure, high-criticality services due to the absence of a longitudinal weld seam.
ASTM A691 5CR: A welded pipe, formed from A387 Gr 5 plate and longitudinally welded. It is often a more economical option for large diameters and specific wall thicknesses, but the weld seam requires extra NDE scrutiny.
Q5: How does the welding process for P5 differ from that of more common alloys like carbon steel?
A: Welding P5 is more complex and requires strict procedure control:
Pre-heat: Mandatory, typically in the range of 300-400°F (150-200°C).
Filler Metal: Must use a matching or over-matched alloy, such as ER502 or E502-XX electrodes.
Post-Weld Heat Treatment (PWHT): Absolutely essential. PWHT (typically between 1100-1350°F / 595-730°C) is required to temper the hard weld and heat-affected zone (HAZ) structure, restore corrosion resistance, and relieve residual stresses.
Q6: What certification and testing do you provide to ensure material quality and traceability?
A: We supply all A335 P5 pipe with a full Material Test Certificate (MTC) conforming to EN 10204 3.1/3.2. This certifies compliance with the ASTM standard and includes results for chemical analysis, tensile tests, and hardness. Standard hydrostatic testing is included, and we can provide additional NDE reports like Ultrasonic Testing (UT) or Dye Penetrant Testing (PT) as required by your project specifications.
Q7: In which industries and specific applications is A335 P5 most commonly used?
A: A335 P5 is a specialist material predominantly used in:
Petroleum Refineries: In fluid catalytic cracking (FCC) units, heater tubes, and transfer lines handling hot, corrosive oils.
Chemical Processing: For reactors and piping systems exposed to certain corrosive chemicals at elevated temperatures.
Power Generation: In specific sections of boilers and heat recovery systems where oxidation resistance is a primary concern.
Q8: What are your standard size ranges and delivery terms for A335 P5?
A: We supply A335 P5 pipe in a wide range, typically from NPS 1/8" to NPS 24", covering standard schedules (SCH 40, 80, 160, XXS) and custom walls. Delivery terms are typically FCA (Free Carrier) or EXW (Ex Works), with CIF/FOB options available for international sea freight.
Q9: Does your P5 material support compliance with international pressure equipment directives?
A: Yes. Our products and comprehensive documentation are designed to support your compliance with major international codes and directives, including the ASME Boiler & Pressure Vessel Code, the European Pressure Equipment Directive (PED 2014/68/EU), and other regional requirements, ensuring global project acceptance.
Q10: What is the ASTM equivalent of A335 P5?
ASTM A335 P5 is part of a family of specifications for different product forms made from the same base material. Its key equivalents are:
Pipe Fittings (Elbows, Tees): ASTM A234 WP5
Flanges & Forged Fittings: ASTM A182 F5
Steel Plate: ASTM A387 Grade 5 (Used for manufacturing vessels or welded pipe)
Welded Pipe: ASTM A691 5CR (The welded pipe version made from A387 Gr 5 plate)
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