Manufacturer & Supplier of Pipe Fittings & Flanges in Stainless Steel, Low Alloy Steel & Carbon Steel.

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Our Products

Alloy Steel Chemical & Mechanical Composition


ASTM A335/ASME SA 335 P5, P9, P11, P22, P91 Seamless Pipes, Tubes

  1. Industrial Boilers
  2. Power Plants
  3. Nuclear Plants


ASTM A335/ASME SA 335 P5, P9, P11, P22, P91 Seamless Pipes, Tubes Chemical Composition %


Grade C Mn P S Si Cr Mo
P5 0.15max 0.30-0.60 0.025 0.025 0.50 max 4.00-6.00 0.45-0.65
P9 0.15max 0.30-0.60 0.025 0.025 0.25-1.00 8.00-10.00 0.90-1.10
P11 0.05-0.15 0.30-0.60 0.025 0.025 0.50-1.00 1.00-1.50 0.44-0.65
P22 0.05-0.15 0.30-0.60 0.025 0.025 0.50 max 1.90-2.60 0.87-1.13
P91 0.08-0.12 0.30-0.60 0.02 0.01 0.20-0.50 8.00-9.50 0.85-1.05
V 0.18-0.25 N 0.03-0.07 Ni 0.40 max Al 0.02 max Cb 0.06-0.10 Ti 0.01 max Zr 0.01 max

ASTM A335/ASME SA 335 P5, P9, P11, P22, P91 Seamless Pipes, Tubes Mechanical Properties


Mechanical Properties
Grade Tensile Strength (Mpa) Yield Strength (Mpa) Elongation (%) Impact energy(J) Hardness
P11 ‰¥ 415 ‰¥ 205 ‰¥ 22 ‰¥ 35 ‰¤ 163HB
P12 ‰¥ 415 ‰¥ 220 ‰¥ 22 ‰¥ 35 ‰¤ 163HB
P22 ‰¥ 415 ‰¥ 220 ‰¥ 22 ‰¥ 35 ‰¤ 163HB
P5 ‰¥ 415 ‰¥ 220 ‰¥ 22 ‰¥ 35 ‰¤ 187HB
P91 585~760 ‰¥ 415 ‰¥ 20 ‰¥ 35 ‰¤ 250HB
P92 ‰¥ 620 ‰¥ 440 ‰¥ 20 ‰¥ 35 250HB

ASTM A335/ASME SA 335 P5, P9, P11, P22, P91 Seamless Pipes

NPS OD Tolerance NPS WT Tolerance
1/8€³ ‰¤ NPS ‰¤ 1 1/2€³ +/- 0.4 1/8€³ ‰¤ NPS ‰¤ 2 1/2€³ , All T/D ratios. +20%, -12.5%
1 1/2 < NPS ‰¤ 4€³ +/- 0.79 NPS ‰¥ 2 1/2€³ , T/D ‰¤ 5% +22.5%, -12.5%
4€³ < NPS ‰¤ 8€³ +1.59, -0.79 NPS ‰¥ 2 1/2€³ , T/D > 5% +15%, -12.5%
8€³ < NPS ‰¤ 12€³ +2.38, -0.79 (T= Specified Wall Thickness; D = Specified Outside DiaReliable Pipes and Tubes Ltd.er)
NPS > 12€³ +/- 1%/td>