Description
ASTM A106 pipe is always produced by the seamless method and can be bent, coiled and flanged.
Sizes
1” – 26” dependent on OD vs Wall Ratio
Mechnical Properties of ASTM A106
| ASTM A106 | Grade B | Grade C |
| Tensile Strength, Min psi | 60,000 | 70,000 |
| Yield Strength, Min psi | 30,000 | 40,000 |
Chemical Composition of ASTM A106
| Element | Grade A | Grade B | Grade C |
| Carbon max. % | 0.25 | 0.30 | 0.35 |
| Manganese % | 0.27 – 0.93 | 0.29 – 1.06 | 0.29 – 1.06 |
| Phosphorus max % | 0.035 | 0.035 | 0.035 |
| Sulfur max % | 0.035 | 0.035 | 0.035 |
| Silicon, min % | 0.10 | 0.10 | 0.10 |
Process
The steel shall be killed steel, with the primary meltling process being open-hearth,basic-oxygen,or electric-furnace,possibly combined with separate degassing or refining. If secondary melting, using electroslag remelting or vacuum-arc remelting is subsequently employed, the heat shall be defined as all of the ingots remelted from a single primary heat.
Steel cast in ingots or strand cast is permissible. When steels of different grades are sequentially strand cast, identification of the resultant transition material is required. The producer shall remove the transition material by any established procedure that positively separates the grades.
Heat treatment
Hot-finished pipe need not be heat treated.When hot finished pipe is heat treated, it shall be heat treated at a temperature of 1200°F(650℃) or higher.
Cold drawn pipe shall be heat treated after the final cold draw pass at a temperature of 1200°F(650℃) or higher.
Bending requirements
For pipe NPS2(DN50) and under, a sufficient length of pipe shall stand being bent cold through 90°around a cylindrical mandrel, the diameter of which is twelve times the outside diameter(as shown in ASME B 36.10M) of the pipe,without developing cracks. Wehn ordered for close coiling, the pipe shall stand being bent cold through 180°around a cylindrical mandrel. the diameter of which is eight times the outside diameter (as shown in ASME B 36.10M) of the pipe, without failure.
Hydrostatic test
Each length of pipe shall be subjected to the hydrostatic test without leakage through the pipe wall.
As a alternative to the hydrostatic test at the option of the manufacturer or where specified in the purchase order, it shall be permissible for the full body of each pipe to be tested with a nondestructive electric test.
Where the hydrostatic test and the nondestructive electric test are omitted and the lengths marked with the letters”NH”,the certification,where required,shall clearly state”Not Hydrostatically Tested” , and the letters”NH” shall be appended to the product specification number and material grade shown on the certification.
Nondestructive electric test
As an alternative to the hydrostatic test at the option of the manufacturer or where specified in the purchase order as an alternative or addition to the hydrostatic test, the full body of each pipe shall be tested with a nondestructive electric test. In such cases. the marking of each length of pipe so furnished shall include the letters”NDE”.It is the intent of this nondestructive electric test to reject pipe with imperfections the produce test signals equal to or greater than that produced by the applicable calibration standard.
Where the nondestructive electric test is performed, the lengths shall be marked with the letters”NDE”. The certification, where required, shall state”Nondestructive Electric Tested” and shall indicate which of the tests was applied. Also, the letters”NDE”shall be appended to the product specification number and material grade shown on the certification.
The ultrasonic testion referred to in this specification is capable of detecting the presence and location of significant longitudinally or circumferentially oriented imperfections:however,differently oriented imperfections. Ultrasonic testing is not necessarily capable of detecting short, deep imperfection.
The eddy current examination referened in this sepcification has the capability of detecting significant imperfections,especially of the short abrupt type.
The flux leakage examination referred to in this specification is capable of detecting the presence and location of signficant longitudinally or transversely oriented imperfections,however,different techniques need to be employed for the detection of such differently oriented imperfections.
