ASTM A106 and ASME SA106 seamless pressure pipe is commonly used in the construction of oil and gas refineries, power plants, petrochemical plants, boilers, and ships where the piping must transport fluids and gases that exhibit higher temperatures and pressure levels.
ASTM A106 Grade C Carbon Steel Seamless Pipes are Medium Carbon Steel Pipes with 0.35 % carbon content with combination of 0.29-1.06 % manganese. These Pipes are most commonly used for general purpose applications worldwide. ASTM A106 Grade C Pipes are ductile and strong Pipes with long wearing properties. These Pipes are manufactured as per ASTM Specification and commercially referred as carbon
steel Pipes.
The ASTM A53 Grade B carbon steel seamless pipes have shared strength with A106 and API 5L. They possess the yield strength of 240 Mpa and tensile strength of 513 Mpa. This improved strength comes from the chrome or the chromium component. These A53 grade B alloy are used for large projects, industrial work, pipelines, petrochemicals, and more. These pipes are durable and work in extreme conditions, making
Specifications: ASTM A53 ASME SA53 them widely used across the sectors. They are also relatively inexpensive and gives value for money. High alloyed elements are used to build the ASTM A53 carbon steel seamless pipes.
Dimensions: ASTM, ASME, and API
Thickness : 3-12mm
Schedules: SCH 40, SCH 80, SCH 160, SCH XS, SCH XXS, All Schedules
End: Plain End, Beveled End, Treaded
Type: Seamless
Length: Min 3 Meters, Max18 Meters, or according to customer’s requirement
| Grade | Chemical Composition (%) Max. | ||||||||
| Cu | Ni | Cr | Mo | V | C | Mn | P | S | |
| C | 0.4 | 0.4 | 0.4 | 0.15 | 0.08 | 0.25 | 0.95 | 0.05 | 0.045 |
ASTM A106 and ASME SA106 covers seamless carbon steel nominal wall pipe for high-temperature service. Suitable for bending, flanging and similar forming operations.
NPS 1-1/2″ and under may be either hot finished or cold drawn. NPS 2″ and larger shall be hot finished unless otherwise specified.
Killed steel, with primary melting process being open-hearth, basic-oxygen, or electric-furnace, possibly combined with separate degassing or refining.
Steel cast in ingots or strand cast is permissible.
Hot-finished pipe need not be heat treated.
Cold-drawn pipe shall be heat treated after the final cold draw pass.
| Grade A | Grade B | Grade C | |
| Carbon max. % | 0.25 | 0.30* | 0.35* |
| *Manganese % | 0.27 to 0.93 | *0.29 to 1.06 | *0.29 to 1.06 |
| Phosphorous, max. % | 0.035 | 0.035 | 0.035 |
| Sulfur, max. % | 0.035 | 0.035 | 0.035 |
| Silicon, min.% | 0.10 | 0.10 | 0.10 |
| Chrome, max. % | 0.40 | 0.40 | 0.40 |
| Copper, max. % | 0.40 | 0.40 | 0.40 |
| Molybdenum, max. % | 0.15 | 0.15 | 0.15 |
| Nickel, max. % | 0.40 | 0.40 | 0.40 |
| Vanadium, max.% | 0.08 | 0.08 | 0.08 |
| *Unless otherwise specified by the purchaser, for each reduction of 0.01% below the specified carbon maximum, an increase of 0.06% manganese above the specified maximum will be permitted up to a maximum of 1.65% (1.35% for ASME SA106). | |||
The minimum wall thickness at any point shall not be more than 12.5% under the nominal wall thickness specified.
Weight of any length shall not vary more than 10% over and 3.5% under that specified. NOTE — NPS 4 and smaller — weighed in lots. Larger sizes shall be weighed separately by length.
It is industry standard for steel pipe mills to produce A106 pipe to the same OD tolerance of A53 pipe, with a +/- 1% OD tolerance.
| Seamless | |||
| Grade A | Grade B | Grade C | |
| Tensile Strength, min., psi | 48,000 | 60,000 | 70,000 |
| Yield Strength, min., psi | 30,000 | 35,000 | 40,000 |
Inspection test pressures produce a stress in the pipe wall equal to 60% of specified minimum yield strength (SMYS) at room temperature. Maximum Pressures are not to exceed 2500 psi for NPS3 and must stay under 2800 psi for the larger sizes. Pressure is maintained for not less than 5 seconds.
Tensile Test — NPS 8 and larger — either transverse or longitudinal acceptable Smaller than NPS 8 — weighed in lots. Larger sizes — by length. Flattening Test — NPS 2-1/2 and larger. Bending Test (Cold) — NPS 2 and under.
| Degree of Bend | Diameter of Mandrel | ||
| For Normal A106 Uses | 90 | 12 x nom dia. of pipe | |
| For Close Coiling | 180 | 8 x nom dia. of pipe |
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