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ASTM A335 P91 Alloy Steel Seamless Pipes and Tubes

ASTM A335  P91 Alloy Steel Seamless Pipes and Tubes

ASTM A335 P91 Alloy Steel Seamless Pipes and Tubes

① Size: 50.8 to 860 mm

② Thickness: 2.77 to 100mm

③ Shape: Round

④ Length: Single random length/ Double random length or as customer’s actual request

⑤ Grade: P11, P12, P22, P91

Introduction

ASTM A335 /A335M ASME SA335 pipes shall be made by the seamless process and shall be either hot-finished or cold drawn with the finishing treatment.

ASTM A335 /A335M covers nominal wall and minimum wall seamless ferritic alloy-steel pipe intended for high-temperature service.

ASTM A 999/A999M specification for general requirements for alloy and stainless-steel pipe

E92 Test method for Vickers hardness of metallic materials

E213 practice for ultrasonic testing of metal pipe and tubing

E309 practice for Eddy-Current examination of steel tubular products using magnetic saturation

E381 method of macro etch testing steel bars, billets, blooms, and forgings

Chemical Composition

Grade C Mn P S Si Cr Mo V Nb N Al Others
P11 0.05-0.15 0.30-0.60 ≤0.025 ≤0.025 0.50-1.00 1.0-1.50 0.44-0.65 / / / / /
P12 0.05-0.15 0.30-0.61 ≤0.025 ≤0.025 ≤0.50 0.80-1.25 0.45-0.65 / / / / /
P22 0.05-0.15 0.30-0.60 ≤0.025 ≤0.025 ≤0.50 1.90-2.60 0.87-1.13 / / / / /
P91 0.08-0.12 0.30-0.60 ≤0.020 ≤0.010 0.20-0.50 8.0-9.50 0.85-1.05 0.18-0.25 0.030-0.070 ≤0.40 ≤0.02
Cb 0.06-0.10
Ti 0.01max
Zr 0.01max

Heat Treatment Requirements

Grade

P11

P12

P22

P91

UNS

Number

K11597

K11562

K21590

K91560

Heat Treat Type

full or isothermal anneal normalize and temper

full or isothermal anneal normalize and temper subcritical anneal

full or isothermal anneal normalize and temper

normalize and temper

quench and temper

Austenitizing/ Solutioning

Temperature, min or range °F [°C]

1900-1975[1040-1080]

1900-1975[1040-1080]

Subcritical Annealing or Tempering

Temperature, Min or range °F [°C]

1200 [650]

1200 [650]

1200-1300 [650 to 705]

1250 [675]

1350-1470[730-800]

1350-1470[730-800]

Tensile Requirements and Hardness

Grade

Tensile

Yield

Elongation

Hardness

Strength (Mpa)

Strength (Mpa)

(%)


P11 P12

≥415

≥220

≥30

≤89HRB

P22

≥415

≥200

≥30

≤89HRB

P91

≥585

≥415

≥20

91HRB-25HRC

Flattening Test—One flattening test shall be made on specimens from each end of one finished tube, not the one used for the flaring test, from each lot

Flaring Test—One flaring test shall be made on specimens from each end of one finished tube, not the one used for the flattening test, from each lot

Hydrostatic or Nondestructive Electric Test—Each tube shall be subjected to the nondestructive electric test or the hydrostatic test. The type of test to be used shall be at the option of the manufacturer, unless otherwise specified in the purchase order.

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