A106 Gr B carbon steel pipe
ASTM A106 Grade B (A106 Gr.B) is a seamless carbon steel pipe specifically engineered for high-temperature and high-pressure service, widely utilized in process piping for the petroleum, chemical, and power industries.
The core technical superiority of this material lies in its robust mechanical properties and strict chemical composition: it maintains a minimum tensile strength of 415 MPa (60,000 psi) and a minimum yield strength of 240 MPa (35,000 psi), while a mandatory silicon content of ≥ 0.10% (via the killed steel process) ensures enhanced oxidation and creep resistance at operating temperatures up to 427°C (800°F).
In terms of manufacturing precision, it strictly adheres to ASME B36.10M dimensional standards, stipulating that the wall thickness must not deviate more than 12.5% below the nominal value; furthermore, each length of pipe must undergo a hydrostatic test based on the formula P=2St/D (or equivalent non-destructive testing) to guarantee absolute structural integrity when conveying high-pressure steam or volatile media.
GNEE Supply Range
Standard: ASTM A106/A106M (High-Temperature Service); can comply with NACE MR0175/Sour Service upon request.
Grade: B
Range of OD: NPS 1/8" to NPS 48" (10.3mm to 1219.2mm)
Range of WT: SCH 10 to SCH 160, SCH XXS; 1.24mm up to 60mm (Custom thickness available)
Range of Length:
SRL: 16ft - 22ft (4.8m - 6.7m)
DRL: Min average 35ft (10.7m)
Fixed Length: 5.8m, 6.0m, 11.8m, 12.0m (20ft to 40ft)
Ends Procession: Plain end, Beveled (30°±5°), Threaded & Coupled
Coating: Black paint/Varnish, Anti-rust oil, FBE, 3PE/3PP, Epoxy coating, Zinc-rich primer, or CRA Clad/Lined for specialized applications.
A106 gradeB Seamless Pipe Mechanical Properties
| Grade | Yield Strength, min. (psi/MPa) | Tensile Strength, min. (psi/MPa) |
| Grade B | 35,000 / 240 | 60,000 / 415 |
A106 GrB Pipe Chemical Composition
| Element | Grade B |
| Carbon (max) | 0.30 |
| Manganese | 0.29 - 1.06 |
| Phosphorus (max) | 0.035 |
| Sulfur (max) | 0.035 |
| Silicon (min) | 0.10 |
| Note |
A106 Steel Pipe Equivalent
| Product Type | ASTM Standard (US) | EN Standard (EU) |
| Seamless Pipe | ASTM A106 Grade B | EN 10216-2 P265GH |
| Seamless Pipe | ASTM A106 Grade A | EN 10216-2 P235GH |
ASTM A106 Grade B Seamless Pipe in stock
A 106 Gr B Pipe Outside Diameter
| Nominal Pipe Size (NPS) | Over | Under |
| inch [mm] | inch [mm] | inch [mm] |
| 1/8 to 1-1/2 [6 - 40] | 1/64 (0.015) [0.4 mm] | 1/64 (0.015) [0.4 mm] |
| Over 1-1/2 to 4 [40 - 100] | 1/32 (0.031) [0.8 mm] | 1/32 (0.031) [0.8 mm] |
| Over 4 to 8 [100 - 200] | 1/16 (0.062) [1.6 mm] | 1/32 (0.031) [0.8 mm] |
| Over 8 to 18 [200 - 450] | 3/32 (0.093) [2.4 mm] | 1/32 (0.031) [0.8 mm] |
| Over 18 to 26 [450 - 650] | 1/8 (0.125) [3.2 mm] | 1/32 (0.031) [0.8 mm] |
| Over 26 to 34 [650 - 850] | 5/32 (0.156) [4.0 mm] | 1/32 (0.031) [0.8 mm] |
| Over 34 to 48 [850 - 1200] | 3/16 (0.187) [4.8 mm] | 1/32 (0.031) [0.8 mm] |
Comparison Table: ASTM A106 Grade B vs. ASTM A53 Grade B
| Feature | ASTM A106 Grade B | ASTM A53 Grade B |
| Primary Design Purpose | Specifically engineered for high-temperature and high-pressure service. | General-purpose piping for water, gas, air, and low-pressure steam. |
| Manufacturing Process | Seamless only. | Available in Seamless (Type S) or Welded (ERW/Type E). |
| Temperature Range | Excellent performance at temperatures up to 427°C (800°F). | Intended for ordinary or medium temperature applications. |
| Key Chemical Element | Silicon (Si) ≥ 0.10% (Mandatory requirement). | No mandatory requirement for Silicon (Si) content. |
| Steelmaking Process | Killed Steel (Mandatory fully deoxidized steel). | Can be Semi-killed or Killed steel. |
| Typical Applications | Refineries, petrochemical plants, power stations, and high-pressure boiler steam lines. | Plumbing, HVAC systems, structural components, and low-pressure utility lines. |
ASTM A106 Gr.B Inspection & Testing
Chemical Analysis
Key Elements: Verifies C, Mn, P, S, and Silicon (min. 0.10%).
Process: Must be Killed Steel; combined residual elements (Cr, Cu, Mo, Ni, V) must be < 1.00%.
Mechanical & Performance Tests
Tensile Test: Min. Tensile Strength 415 MPa (60ksi); Min. Yield 240 MPa (35ksi).
Bending Test (≤ NPS 2): 90° bend around a mandrel; no cracks permitted.
Flattening Test (> NPS 2): Two-stage compression to detect cracks or internal defects.
Pressure & Integrity Testing
Hydrostatic Test: Mandatory for every pipe length ( P=2St/D ) to ensure leak-proof performance.
Non-Destructive Testing (NDT): Ultrasonic (UT) or Eddy Current (ET) used to detect subsurface flaws.
Dimensional & Visual Inspection
Tolerances: Wall thickness (WT) must not be more than 12.5% below nominal.
Visual: Surface must be free of injurious defects (laps, seams, cracks). Light grinding is allowed within WT limits.
Optional Supplementary Tests
Special Services: Grain Size, Hardness testing, or NACE MR0175 (HIC/SSC) for sour service environments.
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FAQ
Q.What Is Thickness Range Of A106 Grade B Seamless Pipe ?
A.The thickness range of A106 Grade B Seamless Pipe lies between 3mm and 12mm.
Q. How do you check all the goods in the production line?
A: We have spot inspection and finished product inspection. We check the goods when they go into next step production procedure.
Q. Can I customise the products?
A. Of course you can. We can manufacture according to your samples or technical drawings. We can make moulds and jigs.
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