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ASTM A106 Grade B Pipe

Typically, the temperature limit set for SA 106 Gr B Sch 40 ranges to about 900° F. Carbon steel pipes intended to be used for high temperature application is produced keeping in accordance to specification ASTM A106. Forming operations such as bending, welding in addition to flanging and other similar operations can be performed on the A106 Carbon Steel Pipe. The specification dictates that the ASTM A106 Gr.B Material be tested for conformance to its mechanical properties. Hence the samples of carbon steel ASTM A106 Grade B Pipe is to include tests for parameters such as bending, flattening, tensile, hydrostatic as well as nondestructive electric tests. In addition to naming the tests to be conducted, the specification mentions some guidelines to perform the bending test.

ASTM A106 Grade B Pipe

For instance, if any sample is to be tested for bending, they need to be cut out from sections of the carbon steel A106 Grade B Seamless Pipe. On the other hand for the performance of flattening tests, the specimens that are to be tested have to be smooth on the ends and burr-free, with the exception of crop ends. All tests have to be performed on the specimen at ambient temperature. A special note is in the specification that if any test specimen demonstrates flaws these carbon steel pipes could be discarded. Following which another test specimen can be used as a substitute. In instances, if a specimen has scribe scratches before being tested, retesting the ASTM A106 Gr B Sch 40 is permitted. A retest shall also be permitted under circumstances that the specimen either has an outside surface flaw or if it breaks in inside.

Specification Chart of ASTM A106 Grade B Pipe

Specifications ASTM A106 ASME SA106
Dimensions ASTM, ASME and API
Size 1/2” NB to 36” NB
Thickness 3-12mm
End Beveled End, Plain End, Treaded
Form Hydraulic, Round Etc
Schedules SCH XS, SCH 40, SCH 160, SCH XXS, SCH 80 All Schedules
Type ERW / Seamless / Fabricated / Welded
Length Max18 Meters, Min 3 Meters or according to customer’s requirement

Do You Know

ASTM A106 grade B Pressure Pipe Can be Manufactured in NPS ¼” to 30” diameter and Schedules 10 through 160, STD. ASTM A106 grade B is normally used in power plants, boilers, petrochemical plants.

A106 Grade B Pipe Chemical Composition

A106 Gr.B
Carbon Manganese Silicon Copper Nickel Chromium Molybdenum Vanadium Phosphorus
0.3 max 0.29~1.06 0.1 min 0.4 max 0.4 max 0.4 max 0.15 max 0.08 0.035

Mechanical Strength of Sch 40 SA106 Gr.B ERW Pipes

Grade Tensile Strength Yield Strength
A106 Gr.B
415 240

Tolerance of ASTM A106 Grade B Pipes

ASTM A106 Grade B Over Under
inch. mm. inch. mm.
Over 4 to 8 [100 to 200] 1/16 (0.062) 1.6 1/32 (0.031) 0.8
1/8 to 1-1/2 [6 to 40] 1/64 (0.015) 0.4 1/64 (0.015) 0.4
Over 1-1/2 to 4 [40 to 100] 1/32 (0.031) 0.8 1/32 (0.031) 0.8
Over 8 to 18 [200 to 450] 3/32 (0.093) 2.4 1/32 (0.031) 0.8
Over 26 to 34 [650 to 859] 5/32 (0.156) 4 1/32 (0.031) 0.8
Over 18 to 26 [450 to 650] 1/8 (0.125) 3.2 1/32 (0.031) 0.8
Over 34 to 48 [850 to 1200] 3/16 (0.187) 4.8 1/32 (0.031) 0.8

A106 Carbon Steel Pipe Testing Requirements

NPS On One Length from Each Lot of
Tensile Test 5 and smaller <= 400
6 and larger <= 200
Bending Test 2 and smaller <= 400
Flattening Test 2 through 5 <= 400
6 and over <= 200
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