ASTM A524 Grade I, II Seamless Carbon Steel Pipe
ASTM A524 Grade I, II Seamless Carbon Steel Pipe Standard:ASTM A524 Standard Specification for Seamless Carbon Steel Pipe for Atmospheric and Lower Temperatures ASTM A524 Grade I and II Steel Pipe covers seamless carbon steel pipe intended
ASTM A524 Grade I, II Seamless Carbon Steel Pipe
ASTM A524 Grade I, II Seamless Carbon Steel Pipe
Standard Specification for Seamless Carbon Steel Pipe for Atmospheric and Lower Temperatures
ASTM A524 Grade I and II Steel Pipe covers seamless carbon steel pipe intended primarily for service at atmospheric and lower temperatures,
Materials and Manufacture
Process:
1.The steel shall be killed steel made by one or more of the following processes: open-hearth, electric-furnace, or basic-oxygen.
2.The steel shall be made to fine grain practice.
3. Steel may be cast in ingots or may be strand cast.
4. ASTM A524 Grade I and II Steel Pipe NPS 1 1 ⁄ 2 and under may be either hot finished or cold drawn.
5. ASTM A524 Grade I and II Steel Pipe NPS 2 and over shall be furnished hot finished
Heat Treatment:
All hot-finished and cold-drawn ASTM A524 Grade I, II Seamless Carbon Steel Pipe will be reheated to a temperature above 1550 °F (845°C) and followed by cooling in air or in the cooling chamber of a controlled atmosphere furnace.
Chemical Composition
| Element | Grades I and II, Composition, % |
| Carbon, max | 0.21 |
| Manganese | 0.90–1.35 |
| Phosphorus, max | 0.035 |
| Sulfur, max | 0.035 |
| Silicon | 0.10–0.40 |
Physical Properties
| Wall Thicknesses | ||||
| Grade I, 0.375 in. (9.52 mm) and under | Grade II, greater than 0.375 in.(9.52 mm) | |||
| Tensile strength, psi (MPa) | 60 000–85 000(414–586) | 55 000–80 000 (380–550) | ||
| Yield strength, min, psi (MPa) | 35 000 (240) | 30 000 (205) | ||
| Longitudinal | Transverse | Longitudinal | Transverse | |
| Elongation in 2 in. or 50 mm, min %: | 30 | 16.5 | 35 | 25 |
| Basic minimum elongation for walls 5 ⁄16 in. (7.9 mm) and over in thickness, strip tests, and for all small sizes tested in full section | 22 | 12 | 28 | 20 |
| When standard round 2 in. or 50 mm gage length test specimen is used for strip tests, a deduction for each 1 ⁄ 32 in. (0.8 mm) decrease in wall thickness below 5 ⁄ 16 in. (7.9 mm) from the basic minimum elongation of the following percentage | 1.50 A | 1.00 A | .... | .... |
Test
Flattening Test --For pipe over NPS 2, a section of pipe not less than 2 1 ⁄ 2 in. (63.5 mm) in length shall be flattened cold between parallel plates until the opposite walls of the pipe meet.
Hydrostatic Test Requirements--Each length of pipe shall be subjected to the hydrostatic pressure,
Dimensions, and Permissible Variations
Diameter—Variations in outside diameter
| NPS Designator | Permissible Variations in Outside Diameter, in. (mm) | |
| Over | Under | |
| 1 ⁄ 8 to 1 1 ⁄ 2 , incl | 1 ⁄ 64 (0.4) | 1 ⁄ 32 (0.8) |
| Over 1 1 ⁄ 2 to 4, incl | 1 ⁄ 32 (0.8) | 1 ⁄ 32 (0.8) |
| Over 4 to 8, incl | 1 ⁄ 16 (1.6) | 1 ⁄ 32 (0.8) |
| Over 8 to 18, incl | 3 ⁄ 32 (2.4) | 1 ⁄ 32 (0.8) |
| Over 18 | 1 ⁄ 8 (3.2) | 1 ⁄ 32 (0.8) |
Thickness—The minimum wall thickness at any point shall not be more than 12.5 % under the nominal wall thickness specified.
Ordering Information
Orders for material include the following, as required, to describe the desired material adequately:
1.Quantity (feet or number of lengths),
2.Name of material (seamless carbon steel pipe),
3.Grade (Grade I and II),
4.Manufacture (hot finished or cold drawn),
5. Size (either nominal wall thickness and weight class or schedule number, or both, or outside diameter and nominal wall thickness, ANSI B36.10),
6.Length ,
7.Test report required
8. Specification designation,
9. End use of material, and
10. Special requirements.
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