A106B Seamless – ASTM Specifications

A106 Standard specification for seamless carbon steel pipe for high-temperature service. Pipe ordered under this specification shall be suitable for bending, flanging, and similar forming operations and for welding. Furnished in one of three grades, A, B, or C. View our Pipe Chart.

	Grade A	Grade B	Grade C
Carbon %	0.25	0.30	0.35
Manganese, %	0.27 – 0.93	0.29 – 1.06	0.29 – 1.06
Phosphorous, Max*, %	0.035	0.035	0.035
Sulfur, Max, %	0.035	0.035	0.035
Silicon, max, %	0.100	0.100	0.100
Chrome, max**, %	0.400	0.400	0.400
Copper, max**, %	0.400	0.400	0.400
Molybdenum, max**, %	0.150	0.150	0.150
Nickel, max**, %	0.400	0.400	0.400
Vanadium, max**, %	0.080	0.080	0.080

* For each reduction of 0.01% below the specified carbon maximum, an increase of 0.06% manganese above the specified maximum will be permited up to a maximum of 1.35%.

** These five elements combined shall not excede 1.0%

	Grade A	Grade B	Grade C
Tensile Strength, Min, psi[Mpa]	48,000 [330]	60,000 [415]	70,000 [485]
Yield Strength, Min, psi[Mpa]	30,000 [205]	35,000 [240]	40,000 [275]
Elongation*** in 2 inch [50mm] , min, % (Longitudinal / Transverse)	28 / 20	22 / 12	20 / 12

*** When standard 2 inch [50mm] gage length specimen is used

The minimum wall thickness at any point shall not be more that 12.5% under the specified wall thickness.

NPS [DN Designator]
1/8 to 1-1/2 [6 to 40], inclusive +/-0.015″” (+/-0.4 mm)
Over 1-1/2 to 4 [40 to 100], inclusive +/-0.031″” (+/- 0.8 mm)
“Over 4 to 8 [100 to 200], inclusive +0.062″”/-0.031″” (+1.6 mm/- 0.8 mm)
“Over 8 to 18 [200 to 450], inclusive +0.093″”/-0.031″” (+2.4 mm/- 0.8 mm)
“Over 18 to 26 [450 to 650], inclusive +0.125″”/-0.031″” (+3.2 mm/- 0.8 mm)
“Over 26 to 34 [650 to 850], inclusive +0.156″”/-0.031″” (+4.0 mm/- 0.8 mm)
“Over 34 to 48 [850 to 1200], inclusive +0.187″”/-0.031″” (+4.8 mm/- 0.8 mm)

Information provided is “Typical” for specific requirements please inquire.