Alloy Steel P9 Seamless Pipes

Grade & Standard

• ASTM A335 P9 Alloy Steel Seamless Pipe
• Suitable for bending, flanging, similar forming operations, and fusion welding

Applications

• Petroleum industry
• Chemical processing plants
• Electric power generation
• Boiler systems
• High-temperature and low-temperature resistant service
• Corrosion-resistant service (as applicable to alloy selection)

Dimensions

• Outside Diameter (OD): 19.05 mm – 114.3 mm
• Wall Thickness: 2.0 mm – 14 mm
• Maximum Length: 16000 mm

Packing

• Bare packing, bundle packing, or crate packing
• Wooden protection at both ends of tubes
• Suitable for sea-worthy delivery or as requested
• Crate marking includes order number, heat number, dimensions, weight, and bundle details

Inspection & Testing

• Chemical composition inspection
• Mechanical property tests: tensile strength, yield strength, elongation, flaring, flattening, bending, hardness, impact test
• Surface and dimensional inspection
• Non-destructive examination as per applicable practice
• Hydrostatic test performed on each pipe length

Surface Treatment

• Oil-dip
• Varnish
• Passivation
• Phosphating
• Shot blasting

Chemical Composition (%)

Element	Value
UNS Designation	K41545
Carbon (max)	0.15
Manganese	0.30 – 0.60
Phosphorus (max)	0.025
Silicon (max)	0.50
Chromium	4.00 – 6.00
Molybdenum	0.45 – 0.65

Mechanical Properties

Property	Value
Tensile Strength (min)	415 MPa
Yield Strength (min)	205 MPa
Elongation (min)	30% (L) / 20% (T)

Material & Manufacture

Pipes are manufactured either hot finished or cold drawn, followed by the specified finishing heat treatment to achieve required mechanical properties.

Heat Treatment Options

• A / N+T
• N+T / Q+T
• N+T

Mechanical Tests (Referenced)

• Transverse or longitudinal tension test
• Flattening test
• Hardness test or bend test
• NDE scope and size-range limitations per applicable ASTM A335 practice