Product Description
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.
Detailed ImagesChemical 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 |
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.) |
| 1/8 to 1-1/2 [6 to 40], incl | 1/64 (0.015) | 0.4 | 1/64 (0.015) |
| Over 1-1/2 to 4 [40 to 100], incl | 1/32 (0.031) | 0.8 | 1/32 (0.031) |
| Over 4 to 8 [100 to 200], incl | 1/16 (0.062) | 1.6 | 1/32 (0.031) |
| Over 8 to 18 [200 to 450], incl | 3/32 (0.093) | 2.4 | 1/32 (0.031) |
| Over 18 to 26 [450 to 650], incl | 1/8 (0.125) | 3.2 | 1/32 (0.031) |
| Over 26 to 34 [650 to 859], incl | 5/32 (0.156) | 0.40 | 1/32 (0.031) |
| Over 34 to 48 [850 to 1200], incl | 3/16 (0.187) | 4.8 | 1/32 (0.031) |
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:
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.
| 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:
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:
| 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 |
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
Product Pictures
Seamless Steel Pipe mills, volume should go through continuous annealing (CAPL unit) to eliminate cold hardening and rolling stress, or batch annealing reach the ASTM A106 Gr.A Gr.B Gr.C Seamless Steel Pipe mechanical properties of the corresponding standard specifies. Seamless Steel Pipe surface quality, appearance, dimensional accuracy ASTM A106 Gr.A Gr.B Gr.C Seamless Steel Pipe better than hot-rolled plate, and right-rolled thin product thickness is about 0.18mm, so the majority of users favor.
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Seamless Steel Pipe deep processing of high value-added products. Such as electro-galvanized, hot dip galvanized, electro-galvanized fingerprint resistant, painted steel roll damping composite steel, ASTM A106 Gr.A Gr.B Gr.C Seamless Steel Pipe laminating steel plates, etc, so that the excellent quality of these products has a beautiful, high resistance to corrosion, has been widely used.