ASTM A335 - Seamless Ferritic Alloy Steel Pipe for High-Temperature Service
Chemical Compositions (max%)
|
Grade
|
C |
Mn |
P |
S |
Si |
Cr |
Mo |
Others |
| P1 |
0.10-0.20 |
0.30-0.80 |
0.025 |
0.025 |
0.10-0.50 |
… |
0.44-0.65 |
… |
| P2 |
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 |
0.15 |
0.30-0.60 |
0.025 |
0.025 |
0.50 |
4.00-6.00 |
0.45-0.65 |
… |
| P5b |
0.15 |
0.30-0.60 |
0.025 |
0.025 |
1.00-2.00 |
4.00-6.00 |
0.45-0.65 |
… |
| P5c |
0.12 |
0.30-0.60 |
0.025 |
0.025 |
0.50 |
4.00-6.00 |
0.45-0.65 |
[Note 1] |
| P9 |
0.15 |
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 |
… |
| P12 |
0.05-0.15 |
0.30-0.61 |
0.025 |
0.025 |
0.50 |
0.80-1.25 |
0.44-0.65 |
… |
| P22 |
0.05-0.15 |
0.30-0.60 |
0.025 |
0.025 |
0.50 |
1.90-2.60 |
0.87-1.13 |
… |
| P23 |
0.04-0.10 |
0.10-0.60 |
0.030 |
0.010 |
0.50 |
1.90-2.60 |
0.05-0.30 |
V 0.20–0.30
Cb 0.02–0.08
B 0.0010–0.006
N 0.0015 max
Al 0.030 max
W 1.45–1.75
Ni 0.40 max
Ti 0.005–0.060
Ti/N ≥ 3.5[Note 2] |
| P36 |
0.10-0.17 |
0.80-1.20 |
0.030 |
0.025 |
0.25-0.50 |
0.30 |
0.25-0.50 |
Ni 1.00-1.30
Cu 0.50-0.80
Cb 0.015-0.045
V 0.02 max
N 0.02 max
Al 0.050 max |
| P91 |
0.08-0.12 |
0.30-0.60 |
0.020 |
0.010 |
0.20-0.50 |
8.00-9.50 |
0.85-1.05 |
V 0.18–0.25
N 0.030–0.070
Ni 0.40 max
Al 0.02 max
Cb 0.06–0.10
Ti 0.01 max
Zr 0.01 max |
| P92 |
0.07-0.13 |
0.30-0.60 |
0.020 |
0.010 |
5.00 |
8.50-9.50 |
0.30-0.60 |
V 0.15–0.25
N 0.03–0.07
Ni 0.40 max
Al 0.02 max
Cb 0.04–0.09
W 1.5–2.00
B 0.001–0.006
Ti 0.01 max
Zr 0.01 max |
| P122 |
0.07-0.14 |
0.70 |
0.020 |
0.010 |
0.50 |
10.00-11.50 |
0.25-0.60 |
V 0.15–0.30
W 1.50–2.50
Cu 0.30–1.70
Cb 0.04–0.10
B 0.0005–0.005
N 0.040–0.100
Ni 0.50 max
Al 0.020 max
Ti 0.01 max
Zr 0.01 max |
| P911 |
0.09-0.13 |
0.30-0.60 |
0.020 |
0.010 |
0.10-0.50 |
8.50-9.50 |
0.90-1.10 |
V 0.18–0.25
Ni 0.40 max
Cb 0.060–0.10
B 0.0003–0.006
N 0.04–0.09
Al 0.02 max
W 0.90–1.10
Ti 0.01 max
Zr 0.01 max |
Notes:
1) Grade P5c shall have a titanium content of not less than 4 times the carbon content and not more than 0.70 %; or a columbium content of 8 to 10 times the carbon content.
2) Alternatively, in lieu of this ratio minimum, the material shall have a minimum hardness of 275 HV in the hardened condition, defined as after austenitizing and cooling to room temperature but prior to tempering. Hardness testing shall be performed at mid-thickness of the product. Hardness test frequency shall be two samples of product per heat treatment lot and the hardness testing results shall be reported on the material test report.
Tensile Requirements
| |
P1, P2 |
P12 |
P23 |
P91 |
P92, P911 P36 Class 1 |
P122 |
P36 Class 2 |
All Others |
| Tensile strength, min: MPa |
380 |
415 |
510 |
585 |
620 |
620 |
660 |
415 |
| Yield strength, min: MPa |
205 |
220 |
400 |
415 |
440 |
400 |
460 |
205 |
Elongation Requirements
| |
All grades except P23, P36 P91, P92, P122, and P911 |
P23, P91, P92, P122, and P 911 |
P36 |
| Longitudinal |
Transverse |
Longitudinal |
Transverse |
Longitudinal |
| Elongation in 2 in. or 50 mm, (or 4D), min, %: Basic minimum elongation for wall 5.16 in. [8 mm] and over in thickness, strip tests,and for all small sizes tested in full section |
30 |
20 |
20 |
... |
15 |
| When standard round 2-in. or 50 mm gage length or proportionally smaller size specimen with the gage length equal to 4DB 4 times the diameter) is used |
22 |
14 |
20 |
13 |
... |
| For strip tests a deduction for each 1.32in. [0.8 mm] decrease in wall thickness below in. [8 mm] from the basic minimum elongation of the following percentage points shall be made |
1.50 A |
1.00 A |
1.00 A |
... |
1.00 A |
Calculated Minimum Elongation Values - Elongation in 2 in. or 50 mm, min, %
| Wall Thickness |
All grades except P23, P36, P91, P92, P122, and P911 P23, P91, P92, P122, and P911 |
P23, P91, P92,
P122, and P911 |
P36 |
| in. |
mm |
Longitudinal |
Transverse |
Longitudinal |
Longitudinal |
| 5 ⁄ 16 (0.312) |
8 |
30 |
20 |
20 |
15 |
| 9 ⁄ 32 (0.281) |
7.2 |
28 |
19 |
19 |
14 |
| 1 ⁄ 4 (0.250) |
6.4 |
27 |
18 |
18 |
13 |
| 7 ⁄ 32 (0.219) |
5.6 |
26 |
... |
17 |
12 |
| 3 ⁄ 16 (0.188) |
4.8 |
24 |
... |
16 |
11 |
| 5 ⁄ 32 (0.156) |
4 |
22 |
... |
15 |
10 |
| 1 ⁄ 8 (0.125) |
3.2 |
21 |
... |
14 |
9 |
| 3 ⁄ 32 (0.094) |
2.4 |
20 |
... |
13 |
8 |
| 1 ⁄ 16 (0.062) |
1.6 |
18 |
... |
12 |
7 |
|
