ASTM A106 Grade B seamless pipe is a carbon steel pipe designed for high-temperature and high-pressure applications, commonly used in industries like oil and gas, power plants, petrochemical facilities, boilers, and shipbuilding. Below is a concise overview based on the ASTM A106 specification:

Key Specifications:

Standard: ASTM A106 / ASME SA106

Material: Carbon steel

Grade: B (most commonly used; other grades are A and C)

Chemical Composition:

Carbon (C): ≤0.30%

Manganese (Mn): 0.29–1.06%

Phosphorus (P): ≤0.035%

Sulfur (S): ≤0.035%

Silicon (Si): ≥0.10%

Chromium (Cr), Copper (Cu), Nickel (Ni), Molybdenum (Mo), Vanadium (V): Each ≤0.40%, with their sum ≤1.00%

Mechanical Properties:

Minimum Yield Strength: 240 MPa (35,000 psi)

Minimum Tensile Strength: 415 MPa (60,000 psi)

Minimum Elongation: 16.5% (longitudinal) / 30% (transverse)

Manufacturing Process:

Seamless, produced by hot rolling or cold drawing

NPS 1-1/2” and under: Hot-finished or cold-drawn

NPS 2” and larger: Hot-finished unless specified otherwise

Steel is killed, processed via open-hearth, basic-oxygen, or electric-furnace methods, with optional degassing or refining

Dimensions:

Nominal Pipe Size (NPS): 1/8” to 48” (DN6 to DN1200)

Wall Thickness: Schedules 10 through 160, STD, XS, XXS (3mm to 12mm typical)

Length: Single random (16–22 ft), double random, or custom (e.g., 6m, 12m)

Outside Diameter Tolerance: ±1% (per industry standards, aligned with A53)

Weight Tolerance: +10% / -3.5% for NPS 4 and smaller (weighed in lots); larger sizes weighed individually

Ends: Plain, beveled, or threaded

Surface Finishes: Black paint, varnish, epoxy, FBE, 3PE, galvanized, or bare

Testing:

Hydrostatic Test: Pressure up to 2500 psi (NPS ≤3”) or 2800 psi (larger sizes), held for ≥5 seconds

Nondestructive Tests: Ultrasonic, eddy current, or flux leakage (per ASTM E213, E309, E570)

Tensile Test: Transverse or longitudinal (NPS ≥8”); smaller sizes weighed in lots

Flattening Test: NPS ≥2-1/2”

Bending Test (Cold): NPS ≤2”

Optional supplementary tests (e.g., NACE MR0175 for sour service)

Applications:

High-temperature and high-pressure fluid/gas transport (e.g., steam, water, oil, gas)

Oil and gas pipelines, refineries, petrochemical plants

Boiler systems, power generation, shipbuilding

Structural and construction purposes (not for low-pressure fluid applications)

Key Features:

High strength, durability, and corrosion resistance

Suitable for bending, flanging, and welding

Seamless construction provides 20% higher strength than welded pipes

Economical and widely available compared to other grades

Equivalents:

ASTM A53 Grade B

API 5L Grade B

Similar to China’s Q235 (chemical and mechanical properties)

Notes:

For critical applications, confirm specific requirements (e.g., ASME SA106 vs. ASTM A106 due to slight manganese content differences).

Pipes can be customized for size, coating, or additional testing (e.g., H2S service).