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01
ASTM A106/A106M Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service
Ordering Information
Purchasers must specify:
● Quantity (length, number of pipes).
● Pipe dimensions (NPS, schedule, or wall thickness).
● Grade (A, B, or C).
● End finish (plain, beveled, threaded).
● Heat analysis requirements (if supplementary requirements apply).
● Test reports (certification to EN 10204 or similar).
● Special requirements (e.g., hydrostatic testing, non-destructive examination).
Steel Grades and Chemical Composition
| Grade | C (max) | Mn | P (max) | S (max) | Si |
| A | 0.25% | 0.27–0.93% | 0.035% | 0.035% | ≥0.10% |
| B | 0.30% | 0.29–1.06% | 0.035% | 0.035% | ≥0.10% |
| C | 0.35% | 0.29–1.06% | 0.035% | 0.035% | ≥0.10% |
Mechanical Properties:
Grade A: Tensile strength ≥48 ksi (330 MPa), yield strength ≥30 ksi (205 MPa).
Grade B: Tensile strength ≥60 ksi (415 MPa), yield strength ≥35 ksi (240 MPa).
Grade C: Tensile strength ≥70 ksi (485 MPa), yield strength ≥40 ksi (275 MPa).
Inspection & Testing Requirements
● Hydrostatic Testing: Each pipe must withstand a pressure calculated by a specified formula (unless replaced by non-destructive testing).
● Non-Destructive Examination (NDE): Optional (e.g., ultrasonic or eddy current) if agreed upon.
● Tensile and Bend Tests: One test per lot (500 pipes max) or heat.
● Flattening Test: For pipes > NPS 4 and wall thickness < 3/16 in.
● Certification: Mill test reports must comply with the standard.
Other Key Requirements
● Manufacturing Process: Pipes are made by seamless hot-working (no welding allowed).
● Heat Treatment: Cold-drawn pipes must be stress-relieved or annealed.
● Dimensions and Tolerances: Governed by ASME B36.10M (imperial) or B36.19M (metric).
● Marking: Each pipe must show manufacturer’s name, grade, size, heat number, and standard number.
Supplementary Requirements (Optional)
S1–S6: Additional tests (e.g., impact testing, macro-etch examination).
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