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0102030405
Seamless Carbon Steel Pipe for High-Temperature Service - ASTM A106/A106M | China Suppliers & Factory
Ordering Information
- 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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❓ Frequently Asked Questions
Q
What information must I provide when ordering seamless steel pipes?
When placing an order, purchasers must specify the quantity (length and number of pipes), pipe dimensions (NPS, schedule, or wall thickness), grade (A, B, or C), end finish type, heat analysis requirements, test reports, and any special requirements such as hydrostatic testing or non-destructive examination.
Q
What are the differences between Grade A, Grade B, and Grade C steel pipes?
The grades differ primarily in carbon content and mechanical strength. Grade A has the lowest carbon content (max 0.25%) and tensile strength (≥48 ksi / 330 MPa). Grade B offers medium strength (≥60 ksi / 415 MPa) with up to 0.30% carbon. Grade C provides the highest strength (≥70 ksi / 485 MPa) with up to 0.35% carbon, making it suitable for higher-pressure applications.
Q
Is hydrostatic testing mandatory for every pipe?
Yes, hydrostatic testing is required for each pipe by default, with pressure calculated using a specified formula. However, it may be replaced by a qualified non-destructive examination (NDE) method such as ultrasonic or eddy current testing, if mutually agreed upon between the purchaser and manufacturer.
Q
Are welded pipes acceptable under this standard?
No. The manufacturing process strictly requires seamless hot-working — welding is not permitted. Cold-drawn pipes must additionally undergo stress-relieving or annealing heat treatment to ensure material integrity.
Q
What dimensional standards govern the pipe sizes and tolerances?
Pipe dimensions and tolerances are governed by ASME B36.10M for imperial measurements and ASME B36.19M for metric measurements. Each pipe must also be marked with the manufacturer's name, grade, size, heat number, and standard number for full traceability.
Q
What are the supplementary requirements (S1–S6)?
Supplementary requirements S1 through S6 are optional additional tests that can be specified by the purchaser. These may include impact testing, macro-etch examination, and other enhanced inspection criteria. They are only applicable when explicitly agreed upon and stated in the purchase order.