Application:

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

Scope: 

• Covers seamless carbon steel nominal wall pipe for high-temperature service, suitable for bending flanging and similar forming operations.
• NPS 1-1/2″ and under may be either hot finished or cold drawn.
• NPS 2″ and larger shall be hot finished unless otherwise specified.

Process:

• Killed steel, with primary melting process being open-hearth, basic-oxygen, or electric-furnace, possible combined with separate degassing or refining.
• Steel cast in ingots or strand cast is permissible.
• Hot-finished pipe need not be heat treated.
• Cold-drawn pipe shall be heat treated after the final cold draw pass.

Chemical Requirements:

	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
Phosphorous, max. %	0.035	0.035	0.035
Sulfur, max. %	0.035	0.035	0.035
Silicon, min.%	0.10	0.10	0.10
Chrome, max. %	0.40	0.40	0.40
Copper, max. %	0.40	0.40	0.40
Molybdenum, max. %	0.15	0.15	0.15
Nickel, max. %	0.40	0.40	0.40
Vanadium, min.%	0.08	0.08	0.08

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

Permissible Variations in Wall Thickness:

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

Permissible Variations in Weights per Foot:

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:

NPS [DN Designator]	Over(in.)	Over(mm)	Under(in.)	Under(mm)
1/8 to 1-1/2 [6 to 40], incl	1/64 (0.015)	0.4	1/64 (0.015)	0.4
Over 1-1/2 to 4 [40 to 100], incl	1/32 (0.031)	0.8	1/32 (0.031)	0.8
Over 4 to 8 [100 to 200], incl	1/16 (0.062)	1.6	1/32 (0.031)	0.8
Over 8 to 18 [200 to 450], incl	3/32 (0.093)	2.4	1/32 (0.031)	0.8
Over 18 to 26 [450 to 650], incl	1/8 (0.125)	3.2	1/32 (0.031)	0.8
Over 26 to 34 [650 to 859], incl	5/32 (0.156)	0.40	1/32 (0.031)	0.8
Over 34 to 48 [850 to 1200], incl	3/16 (0.187)	4.8	1/32 (0.031)	0.8

Tensile Requirements:

	Grade A	Grade B	Grade C
Tensile Strength, min., psi	48,000	60,000	70,000
Yield Strength, min., psi	30,000	35,000	40,000

Number of Tests Required:

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

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:

• Tensile Test — NPS 8 and larger — either transverse or longitudinal acceptable
• Smaller than NPS 8 — weighed in lots. Larger sizes — by length.
• Flattening Test — NPS 2-1/2 and larger.

Bending Test (Cold) — NPS 2 and under.

	Degree of Bend	Diameter of Mandrel
For Normal A106 Uses	90	12 x nom dia. of pipe
For Close Coiling	180	8 x nom dia. of pipe

Lengths:

Lengths required shall be specified on order. No “jointers” permitted unless otherwise specified.

If no definite lengths required, following practice applies:

1. Single Random — 17′ ~ 24′ lengths.
2. Double Random — 36′ ~ 44′ lengths.

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

• Rolled, Stamped, or Stenciled (Mfrs. Option)
• Manufacturer’s name or brand. Length of pipe.
• A106 A, A 106 B, A 106 C. ANSI schedule number.
• Hydrostatic test pressures and/or NDE;
• Weight per foot (NPS 4 and larger)or NH if neither is specified.
• Additional “S” if tested supplementary requirements.

Referenced Documents:

• ASTM A 530/A 530M Specification for General Requirements for Specialized Carbon and Alloy Steel Pipe
• ASTM E 213 Practice for Ultrasonic Examination of Metal Pipe and Tubing
• ASTM E 309 Practice for Eddy-Current Examination of Steel Tubular Products Using Magnetic Saturation
• ASTM E 381 Method of Macroetch testing Steel Bars, Billets, Blooms, and Forgings
• ASTM E 570 Practice for Flux Leakage Examination of Ferromagnetic Steel Tubular Products
• ASME B26.10M Welded and Seamless Wrought Steel Pipe

General Information:

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

Quantity	Feet, centimeters, or number of lengths
Name of material	Seamless or Welded Pipe
Grade	Grade A, Grade B, or Grade C
Manufacture	Hot-finished or cold-drawn
Size	NPS or Outside Diameter and Schedule Number of Average Wall Thickness
	Special outside diameter tolerance pipe
	Inside diameter tolerance pipe, over 10 in ID
Length	Specific or random
Supplementary requirements	/
Test Report Required	/
Specification designation	/
Hydrostatic test	/
Special requirements	/

Protection:

Pipes are supplied:

• black and bare
• external varnished with black or clear lacquer
• 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:

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

Mill test certifi cate:
MTC is issued in accordance with EN 10204.