Astm A335 P11 Alloy Steel Pipe

Standard & Grade

• Standard: ASTM A335 / ASTM A335M
• ASME Equivalent: SA335
• Grade: P11
• Product type: Seamless ferritic alloy steel pipe
• Service: High-temperature applications

Material & Manufacture

• Pipe may be supplied hot finished or cold drawn
• Finishing heat treatment applied as specified by ASTM A335
• Material conforms to chemical composition, tensile, and hardness requirements

Heat Treatment Options

• A (Annealed)
• N + T (Normalized and Tempered)
• Q + T (Quenched and Tempered)

Chemical Composition (%)

• UNS Designation: K11597
• Carbon: 0.05 – 0.60
• Manganese: 0.30 – 0.60
• Phosphorus (max): 0.025
• Sulfur (max): 0.025
• Silicon: 0.50 – 1.00
• Chromium: 1.00 – 1.50
• Molybdenum: 0.44 – 0.65

Mechanical Properties

• Tensile strength (min): 415 MPa
• Yield strength (min): 205 MPa
• Elongation (min): 30% (Longitudinal) / 20% (Transverse)

Inspection & Testing

• Chemical composition inspection
• Tensile test (longitudinal or transverse)
• Flattening test
• Hardness test or bend test
• Hydrostatic test on each pipe length
• Non-destructive examination (NDE)
• Surface and dimensional inspection

Test Sampling

• Batch-type furnace: 5% of pipes per treated lot (minimum one pipe)
• Continuous heat treatment: minimum two pipes or 5% of the lot

Surface Treatment

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

Packing & Marking

• Bare packing, bundle packing, or crate packing
• Wooden protection at both pipe ends
• Sea-worthy export packing as required
• Each crate marked with order number, heat number, dimensions, weight, and bundle details