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Understanding ASTM A106/ASME SA106 Seamless Carbon Steel Pipe
ASTM A106/ASME SA106 defines the standard specification for seamless carbon steel pipes designed for high-temperature services. It encompasses three grades: A, B, and C, with Grade B being the most commonly utilized. These pipes are widely used across various industries, including pipeline systems for oil and gas, water, and mineral slurry transmission, as well as in boiler systems, construction, and structural applications.
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ASTM A106 Grade B and A pipe Chemical composition in %
| ASTM A106 | C, max. | Mn | P, max | S, max | Si, min | Cr, max | Cu, max | Mo, max | Ni, max | V, max | Tensile strength, min, psi (MPa) | Yield strength, min, psi (MPa) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Grade B | 0.30 | 0.29 – 1.06 | 0.035 | 0.035 | 0.10 | 0.40 | 0.40 | 0.15 | 0.40 | 0.08 | 60000 (415) | 35,000 (240) |
note:
For every reduction of 0.01% in the maximum carbon element, an increase of 0.06% in manganese above the specified value is allowed, up to a maximum of 1.35%. Elements Cr, Cu, Mo, Ni, V combined shall not exceed 1%.
A106 Grade B Pipe Differences In Mechanical Composition
| Mechanical Properties | ||||||
|---|---|---|---|---|---|---|
| Grade | Grade A | Grade B | Grade C | |||
| Tensile strength, min, psi | 48000 [330] | 60000 [415] | 70000 [485] | |||
| Yield strength, min, psi [MPa] | 30000 [205] | 35000 [240] | 40000 [275] | |||
| Direction | Longitudinal | Transverse | Longitudinal | Transverse | Longitudinal | Transverse |
| Elongation in 2 in. [50mm], min, % | 35 | 25 | 30 | 16.5 | 30 | 16.5 |
| When standard round 2-in. [50-mm] gage length test specimen is used | 28 | 20 | 22 | 12 | 20 | 12 |
| For longitudinal strip tests | A | A | A | A | A | A |
| For transverse 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 shall be made | 1.25 | 1.00 | 1.00 | |||
Elongation formula:
In 2 in. [50mm], shall be calculated by: e = 625 000 A^0.2 / U^0.9
For inch-pound Units, e = 1940 A^0.2 / U^0.9
Explanations:
e = minimum elongation in 2 inch (50mm) in percent rounded to the nearest percent
A = specimen cross-sectional area, rounded to 0.01 in.^2 (1 mm^2), based on the specified outside diameter to the nominal specimen width and wall thickness. If the area calculated is equal or above than 0.75 in.^2 (500 mm^2), then the value 0.75 in.^2 (500 mm^2) shall be applied, and
U = specified tensile strength, psi (Mpa)
Tensile Strength, min, psi [MPa] Grade A 48,000 [330], Grade B 60,000 [415], Grade C 70,000 [485]
Yield Strength minimum at psi [MPa] Grade A 30,000 [205], B 35,000 [240], C 40,000 [275]
Elongation in 2 in (50mm), minimum percentage % ,
For all small sizes tested in full section, basic minimum elongation transverse trip tests: Grade A Longitudinal 35, Transverse 25; B 30, 16.5; C 30, 16.5;
In case standard round 2 inch gage length test sample is used, above values are: Grade A 28, 20; B 22, 12; C 20, 12.
Equivalence and Specifications
ASTM A106 Grade B pipe is equivalent to ASTM A53 Grade B and API 5L Grade B concerning chemical composition and mechanical properties. It is a high-grade carbon steel with a minimum yield strength of 240 MPa and a minimum tensile strength of 415 MPa.
Strength and Grades of Seamless Pipe
The ASTM A106 standard outlines the specifications for seamless steel pipes, categorizing them into three grades: ASTM A106 Gr. A, Gr. B, and Gr. C. Higher-grade materials offer enhanced strength performance, making them suitable for more demanding applications.
Test Methods
ASTM A106 Grades A, B, and C undergo rigorous testing, including:
- Flattening tests
- Hydrostatic tests
- Nondestructive electric tests
- Ultrasonic tests
- Eddy current tests
- Flux leakage tests
These test procedures are essential and should be discussed and confirmed with the client to determine the specific tests required for each project.
Raw Materials and Forming Processes
Materials used under the ASTM A106 standard must be suitable for bending, flanging, or similar forming processes. If welding is necessary, the welding process must be appropriate for ASTM A106 steel and suitable for high-temperature working environments.
Our Supply Range for Sale
C&N HongCheng supplys ASTM A106 Grade A, Grade B, and Grade C seamless carbon steel pipes under the following conditions:
Standard: ASTM A106, Nace, Sour service.
Grade: A, B, C
Range of OD outer diameter: NPS 1/8 inch to NPS 20 inch, 10.13mm to 1219mm
Range of WT wall thickness: SCH 10, SCH 20, SCH STD, SCH 40, SCH 80, to SCH160, SCHXX; 1.24mm up to 1 inch, 25.4mm
Range of length: 20ft to 40ft, 5.8m to 13m, single random lengths of 16 to 22ft, 4.8 to 6.7m, double random length with average 35ft 10.7m
Ends procession: Plain end, beveled, threaded
Coating: Black paint, varnished, epoxy coating, polyethylene coating, FBE and 3PE, CRA Clad and Lined.
For projects requiring a superior grade of ASTM A106 steel pipe, the standard provides optional specifications for supplementary requirements. These supplementary specifications necessitate additional testing, which should be conducted when placing an order to ensure compliance with the enhanced standards.
At C&N Group, we are committed to providing seamless carbon steel pipes that adhere to the ASTM A106/ASME SA106 standards, ensuring reliability and performance for high-temperature applications. Contact us today to learn more about our offerings and how we can meet your specific project requirements.
