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Details of ASTM A335 P22 seamless steel pipes

Date:2025-05-27

ASTM A335 P22 seamless steel pipes must comply with TSG D7002–Pressure Piping Component Type Test Regulations, ensuring safety and performance in high-temperature and high-pressure environments.


Continental Steel Co., Ltd is professional seamless steel pipe manufacturer, for more details, please contact:sales@cscsteel-manufacturing.com

 

Specifications of ASTM A335 P22 Seamless Steel Pipe

Outside Diameter: 21.3 mm–762 mm

Wall Thickness: 2.0 mm–140 mm
This wide specification range makes ASTM A335 P22 suitable for various industrial piping applications, including boilers, power stations, and petrochemical systems.

 

Chemical Composition (% by weight)

ASTM A335 P22 alloy steel pipe contains precise elements that enhance high-temperature strength and corrosion resistance:

Carbon (C): 0.05–0.15

Manganese (Mn): 0.30–0.60

Phosphorus (P):≤0.025

Sulfur (S):≤0.025

Silicon (Si):≤0.50

Chromium (Cr): 1.90–2.60

Molybdenum (Mo): 0.87–1.13

Nickel (Ni):≤0.50

 

Mechanical Properties

ASTM A335 P22 seamless steel pipes are designed to withstand elevated temperature and pressure conditions:

Tensile Strength:≥415 MPa

Yield Strength:≥205 MPa

Elongation:≥30%

Brinell Hardness (HBW):≤163

 

These properties ensure excellent creep resistance and ductility, essential for long-term service at high temperatures.

 

Manufacturing Methods & Delivery Condition

ASTM A335 P22 pipes are manufactured via:

Cold Drawing

Hot Rolling

Hot Expansion

 

Delivery condition: All pipes undergo heat treatment to meet metallurgical and mechanical requirements for high-temperature service.

 

Surface Quality & Appearance Standards

Defect Inspection & Evaluation

Steel pipe manufacturers must identify and evaluate visible surface defects to ensure compliance. Not all surface imperfections require measurement, but a sufficient quantity must be assessed to guarantee uniform quality.

 

Harmful Defect Definition:
Any surface flaw with a depth exceeding 12.5% of the nominal wall thickness, or any flaw that compromises the minimum required wall thickness, is considered harmful.

 

Permitted Defect Treatments

Grinding

Defects may be removed with a grinding wheel if the remaining wall thickness stays within standard limits.

Grinding must create a smooth, tapered transition without sharp reductions in wall thickness.

 

Pipe Cutting

Defective segments within allowable length tolerance may be cut and removed.

 

Defect Removal Criteria
The following defects must be removed if they exceed 1.6 mm in depth or affect visual quality:

Mechanical scratches

Pits and gouges

Rope marks, rail scratches, roller marks, steel ball impressions, and mold scars

 

Acceptable Appearance Standards

Even if surface flaws meet dimensional standards, pipes may be rejected if defects are large-area concentrated and aesthetically unacceptable. Final decisions can be negotiated between the manufacturer and the buyer.

Wall Thickness Verification

Wall thickness at the grinding area must not fall below the allowable limit.

 

Measurements should be conducted using a mechanical caliper or calibrated non-destructive testing device.

 

In case of disputes, caliper measurements take precedence.

 

Summary

ASTM A335 P22 seamless alloy steel pipe is a high-performance material designed for high-temperature pressure systems, such as boilers, heat exchangers, and petrochemical plants. It offers excellent strength, creep resistance, and dimensional precision, backed by strict surface and quality standards. Its optimized chemistry and controlled production processes make it a reliable choice for demanding thermal and mechanical applications.

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