ASTM A335 – Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
Grade: P12
Chemical Requirements max %
| Elements |
Composition |
| Carbon |
0.05 – 0.15 |
| Manganese |
0.30–0.61 |
| Phosphorus |
0.025 |
| Sulfur |
0.025 |
| Silicon |
0.50 |
| Chromium |
0.80 – 1.25 |
| Molybdenum |
0.44 – 0.65 |
Tensile Requirements
| Tensile strength, min ksi[Mpa] |
60[415] |
| Yield strength, min: ksi[Mpa] |
32[220] |
Elongation Requirements
| |
Longitudinal |
Transverse |
| 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 |
| 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 |
| 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 |
A Table below gives the calculated minimum values.
| Wall Thickness |
Longitudinal |
Transverse |
| in. |
mm |
| 5 ⁄ 16 (0.312) |
8 |
30 |
20 |
| 9 ⁄ 32 (0.281) |
7.2 |
28 |
19 |
| 1 ⁄ 4 (0.250) |
6.4 |
27 |
18 |
| 7 ⁄ 32 (0.219) |
5.6 |
26 |
… |
| 3 ⁄ 16 (0.188) |
4.8 |
24 |
… |
| 5 ⁄ 32 (0.156) |
4 |
22 |
… |
| 1 ⁄ 8 (0.125) |
3.2 |
21 |
… |
| 3 ⁄ 32 (0.094) |
2.4 |
20 |
… |
| 1 ⁄ 16 (0.062) |
1.6 |
18 |
… |
