What is the specification for ASTM A335 alloy steel pipe?
ASTM A335 specification covers seamless ferritic alloy steel pipe for high temperature service.
Pipes shall be suitable for bending, flanging and similar forming operations as well as fusion welding. P2 and P12 grade steel pipes should be manufactured using coarse grain smelting methods.
ASTM A335 seamless alloy pipes are mainly used in high-temperature superheaters, reheaters, economizers, air preheaters, water walls, centralized downcomers, main steam ducts, steam and water ducts, superheated steam pipes, and reheated steam pipes of power station boilers. and other parts.
What is the tensile strength of ASTM A335 seamless boiler tube?
A335 pipe has a minimum yield strength of 415 MPA and a minimum tensile strength of 585 MPA. The elongation limits of these pipes range from 20 to 30 percent. ASTM A335 GR. P91 pipe gains enhanced creep strength and durability through a heat treatment process where the metal is normalized at 1500 degrees.
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| ASTM A335/ A335M Chemical Composition % | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Grade | UNS | C | Mn | P | S | Si | Cr | Mo | Others |
| P1 | K11522 | 0.10-0.20 | 0.30-0.80 | 0.025 | 0.025 | 0.10-0.50 | - | 0.44-0.65 | - |
| P2 | K11547 | 0.10-0.20 | 0.30-0.61 | 0.025 | 0.025 | 0.10-0.30 | 0.50-0.81 | 0.44-0.65 | - |
| P5 | K41545 | 0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50 | 4.00-6.00 | 0.45-0.65 | - |
| P5b | K51545 | 0.15 | 0.30-0.60 | 0.025 | 0.025 | 1.00-2.00 | 4.00-6.00 | 0.45-0.65 | - |
| P5c | K41245 | 0.12 | 0.30-0.60 | 0.025 | 0.025 | 0.50 | 4.00-6.00 | 0.45-0.65 | *A |
| P9 | S50400 | 0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.25-1.00 | 8.00-10.00 | 0.90-1.10 | - |
| P11 | K11597 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 | - |
| P12 | K11562 | 0.05-0.15 | 0.30-0.61 | 0025 | 0.025 | ≤0.50 | 0.80-1.25 | 0.44-0.65 | - |
| P15 | K11578 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 1.15-1.65 | - | 0.44-0.65 | - |
| P21 | K31545 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50 | 2.65-3.35 | 0.80-1.06 | - |
| P22 | K21590 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50 | 1.90-2.60 | 0.87-1.13 | - |
| P23 | K41650 | 0.04-0.10 | 0.10-0.60 | 0.030 | 0.010 | 0.50 | 1.90-2.60 | 0.05-0.30 | *B |
| P36 | K21001 | 0.10-0.17 | 0.80-1.20 | 0.030 | 0.025 | 0.25-0.50 | 0.30 | 0.25-0.50 | *C |
| P91 | K91560 | 0.08-0.12 | 0.30-0.60 | 0.020 | 0.010 | 0.20-0.50 | 8.00-9.50 | 0.85-1.05 | *D |
| P92 | K92460 | 0.07-0.13 | 0.30-0.60 | 0.020 | 0.010 | 0.50 | 8.50-9.50 | 0.30-0.60 | *E |
| P122 | K92930 | 0.07-0.14 | 0.70 | 0.020 | 0.010 | 0.50 | 10.00-11.50 | 0.25-0.60 | *F |
| P911 | K91061 | 0.09-0.13 | 0.30-0.60 | 0.020 | 0.010 | 0.10-0.50 | 8.50-9.50 | 0.90-1.10 | *G |
*The UNS designation is established in accordance with Practice E527, and SAE J 1086 – Practice for numbering metals and alloys.
*All values are the maximum unless a range is furnished.
*A – 4 times of Carbon≤Titanium≤0.70% or Columbium:8 times of Carbon~10 times of Carbon.
*B – V:0.20-0.30, Cb:0.02-0.08, B: 0.0010-0.006, N:≤0.0015, Al:≤0.030, W:1.45-1.75, Ni:≤0.40, Ti: 0.005-0.060, Ti/N:≥3.5.
*C – Ni:1.00-1.30, Cu:0.50-0.80, Cb:0.015-0.045, V:≤0.02, N:≤0.02, Al:≤0.050.
*D – V:0.18-0.25, N:0.030-0.070, Ni:≤0.40, Al:≤0.02, Cb:0.06-0.10, Ti:≤0.01, Zr:≤0.01.
*E – V:0.15-0.25, N:0.03-0.07, Ni:≤0.40, Al:≤0.02, Cb:0.04-0.09, W:1.5-2.0, B:0.001-0.006, Ti:≤0.01, Zr:≤0.01.
*F – V:0.15-0.30, W:1.30-2.50, Cu:0.30-1.70, Cb:0.04-0.10, B:0.0005-0.005, N:0.040-0.1, Ni:≤0.5, Al:≤0.02, (Ti&Zr):≤0.01.
*G – V:0.18-0.25, Ni:≤0.40, Cb:0.060-0.10, B:0.0003-0.006, N:0.04-0.09, Al:≤0.02, W:0.90-1.10, Ti:≤0.01, Zr:≤0.01.
ASTM A335 High pressure alloy steel pipe
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