Galvanized Steel Seamless Pipe ASTM A106 B

Galvanized Steel Seamless Pipe ASTM A106 B

Galvanization or galvanizing is the process of applying a protective zinc coating to steel or iron , to prevent rusting . The most common method is hot-dip galvanizing , in which the parts are submerged in a bath of molten zinc. Galvanizing protects the underlying iron or steel in the following...

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Galvanization or galvanizing is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which the parts are submerged in a bath of molten zinc.

Galvanizing protects the underlying iron or steel in the following main ways:

  • The zinc coating, when intact, prevents corrosive substances from reaching the underlying steel or iron.

  • The zinc protects iron by corroding first. For better results, application of chromates over zinc is also seen as an industrial trend.

  • In the event the underlying metal becomes exposed, protection can continue as long as there is zinc close enough to be electrically coupled. After all of the zinc in the immediate area is consumed, localized corrosion of the base metal can occur.


ASTM A106 Standard Specification

ASTM A106 is the standard specification for seamless carbon steel pipe applied for high temperature services.    

The standard covers pipe sizes in NPS (National Standard Straight) from 1/8 inch to 48 inch (10.3mm DN6 – 1219mm DN1200), meanwhile complied the nominal wall thickness of the standard ASME B 36.10M. For other sizes out of the ASME B 36.10M is also allowed to use this standard specification.

ASTM A106 standard specifications for the seamless steel pipe have three grades, that is ASTM A106 Gr. A, Grade. B and C, with the higher grade material, the strength performance is better.

Chemical composition and Mechanical Strength

ASTM A106 Grade B and A pipe chemical composition

astm a106 b chemical composition

Please note:

For each reduction of 0.01% for maximum carbon element, an increase of 0.06% manganese above the specified value shall be permitted, and up to maximum of 1.35%.
Elements Cr, Cu, Mo, Ni, V combined shall not exceed 1%.

Tensile Strength and Yield Strength

astm a106 b mechanical properties tensile and yield strength

Elongation formula:
In 2 in. [50mm], shall be calculated by: e = 625 000 A^0.2 / U^0.9
For inch-pound Units, e = 1940 A^0.2 / U^0.9

Elongation in 2 in (50mm), minimum percentage % ,

For all small sizes tested in full section, basic minimum elongation transverse trip tests: Grade A Longitudinal 35, Transverse 25; B 30, 16.5; C 30, 16.5;
In case standard round 2 inch gage length test sample is used, above values are: Grade A 28, 20; B 22, 12; C 20, 12.

Test Methods

The test methods for the ASTM A106 A, B, C are the flattening tests, hydrostatic test, nondestructive electric test, Ultrasonic test, eddy current test, flux leakage test, these test procedures shall be notified or discussed with client to confirm what kind of test will be applied.

We can supply ASTM A106 B seamless pipes. size: 1" to 30". Wt: 2.5-50mm, Length: 6-20m.

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