ASTM A106 / A106M – 15 Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service

ASTM A178 / A178M – 02(2012)

Standard Specification for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes

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. 

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

· *ASTM A 106 grade B Seamless Pressure Pipe

· B) Unless otherwise specified by the purchaser, for each reduction of 0.01 % below the specified carbon maximum, an increase of 0.06 % manganese above the specified maximum will be permitted up to a maximum of 1.65 %.

· *ASME SA 106 grade B Seamless Pressure Pipe

· B) For each reduction of 0.01 % below the specified carbon maximum, an increase of 0.06 % manganese above the specified maximum will be permitted up to a maximum of 1.35 %.

Process 
Killed steel, with primary melting process being open-hearth, basic-oxygen, or electric-furnace, possibly 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 to 0.93

*0.29 to 1.06

0.29 to 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


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

Under

in.

mm

in.

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)

4.0

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

Seamless

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

6 and larger

200 or less

Bending

2 and smaller

400 or less

Flattening

2 through 5

400 or less

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 must stay 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: 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) 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. 
 

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

Common Uses: 
– Pressure systems 
– Mechanical components 
– Structural applications 
– Spreader bars

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