ASTM A106 Seamless Steel Pipe

Applications:

steam, water, gas and air pipelines as well as general machinery and tools for industry and construction.

Process:

1)Killed steel, with primary melting process being open-hearth, basic-oxygen, or electric-furnace, possible combined with separate degassing or refining.

2)Steel cast in ingots or strand cast is permissible.

3)Hot-finished pipe need not be heat treated.

4)Cold-drawn pipe shall be heat treated after the final cold draw pass.

Chemical Requirements:

Note: Total of Cr, Cu, Mo, Ni, and V shall not exceed 1%.

Weight of any length shall not vary more than 10% over and 3.5% under that specified.
NOTE — NPS 4 and smaller — weighed in lots. Larger sizes shall be weighed separately by length.
Permissible Variations in Outside Diameter:
Outside Diameter at any point shall not vary from standard specified more than:

Tensile Requirements:

Number of Tests Required:

Hydrostatic Testing:

Inspection test pressures produce a stress in the pipe wall equal to 60% of specified minimum yield strength (SMYS) at room temperature. Maximum Pressures are not to exceed 2500 psi for NPS3 and under 2800 psi for the larger sizes. Pressure is maintained for not less than 5 seconds.

Mechanical Tests Specified:

1)Tensile Test — NPS 8 and larger — either transverse or longitudinal acceptable

2)Smaller than NPS 8 — weighed in lots. Larger sizes — by length.

3)Flattening Test — NPS 2-1/2 and larger.

Bending Test (Cold) — NPS 2 and under.

Lengths:

Lengths required shall be specified on order. No “jointers” permitted unless otherwise specified.
If no definite lengths required, following practice applies:
Single Random — 17′ ~ 24′ lengths
Double Random — 36′ ~ 44′ lengths

Required Markings on Each Length(On Tags attached to each Bundle in case of Bundled Pipe):

1)Rolled, Stamped, or Stenciled (Mfrs. Option)

2)Manufacturer’s name or brand. Length of pipe.

3)A106 A, A 106 B, A 106 C. ANSI schedule number.

4)Hydrostatic test pressures and/or NDE;

5)Weight per foot (NPS 4 and larger)or NH if neither is specified.

6)Additional “S” if tested supplementary requirements.

General Information:

Orders for material under this specification should include the following, as required, to describe the desired material adequately:

Protection:

Pipes are supplied:

1)black and bare

2)external varnished with black or clear lacquer

3)oiled

Upon request, pipes ends are protected by plastic caps

Marking:

Pipes are supplied with marking according to standard and customer request.
Marking is paint and/or die stenciled on the ends of pipes. The same data, as well as additional information per customer’s request, is indicated on the bundle’s tags.

Delivery:

1)Pipes are supplied in hexahedral (up to OD114 mm) or round (above 121 mm) bundles tied in at least fi ve places with steel strip.

2)Weight of bundle – up to 5000 kg upon request of customer.
3)Each bundle is furnished with three tags.

Mill test certificate:

MTC is issued in accordance with EN 10204