Corten Steel Pipe

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1. Scope
1.1 This specification covers minimum-wall-thiclcness, seamless and electric-resistance welded, low-alloy
steel tubes for pressure containing parts such as economizers or other applications where cossosion resistance
is important.

1.2 The tubing sizes and thicknesses usually furnished to this specification are % to 5 in. [12.7 to 127 mm] in
outside diameter and 0.035 to 0.500 in. [0.9 to 12.7 m] inclusive, in minimum wail thicknesses. Tubing having
other dimensions may be furnished, provided such tubes comply with all other requirements of this specification.

1.3 Mechanical property requirements do not apply to tubing smaller than % in. [3.2 mm] in inside diameter
or 0.015 in. [0.4 mm] in thickness.

1.4 An optional supplementary requirement is provided and, when desired, shall be so stated in the order.

1.5 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within
the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore,
each system must be used independently of the other. Combining values from the two systems may result in
nonconformance with the specification. The inch-pound units shall apply unless the "M" designation of this specification is specified in the order.

2. Referenced Document
2.1 ASTM Stnizdni-d: E 213 Practice for Ultrasonic Examination of Metal Pipe
and Tubing
E 273 Practice for Ultrasonic Examination of Longitudinal Welded Pipe and TubingA 4501A 450M Specification for General Requirements for Carbon, Fenitic Alloy, and Austenitic Alloy Steel
3. Ordering Information
3.1 Orders for material under this specification shall include the following, as required, to describe the desired
material adequately;

3.1.1 Quantity (feet, metres, or number of lengths),

3.1.2 Name of material (seamless or electric-resistance welded tubes),

3.1.3 Grade (Table 1),

3.1.4 Manufacture (hot finished or cold finished),

3.1.5 Size (outside diameter and minimum wall thiclcness)

3.1.6 Length (specific or random),

3.1.7 Optional requirements (hydrostatic or electric tcst, 13.7),

3.1.8 Test report required (see Certification Section of Specification A 4501A 450M),

3.1.9 Specification designation, and

3.1.10 Special requirements and any supplementary requirements selected.

4. Manufacture
.I Tubes made by the seamless process may be hot finished or cold finished.

5. Heat Treatment
5.1 All tubes shall be nomalized or given such heat treatment as may be necessary to conform to the requirements of this specification.


6. Chemical Composition
6.1 The steel shall conform to requirements as to chemical composition prescribed in Table 1.

7. Product Analysis
7.1 An analysis of either one billet, one length of flatrolled stock or one tube shall be made from each heat.
The chemical composition thus determined shall confo~m to the requireinents specified.

7.2 If the original test for product a~lalysisfa ils, retests of two additional billets, lengths of flat-rolled stocli, or
tubes shall be made. Both retests, for the elements in question shall meet the requirements of the specification;
otherwise all remaining material in the heat or lot (Note 1) shall be rejected or, at the option of the producer, each billet, length of flat-rolled stock or t~lbe may be individually tested for acceptance. Billets, lengths of flatrolled stock or tubes which do not meet the requirements of the specification shall be rejected.

NOTE 1-For flatten~ng, flaring, and Range requirements, the term lot applies to all tubes prior to cutting of the same noiniiial slze and wall
thickness that are produced from the same heat of steel. When final lieat treatment IS In a batch-type furnace, a lot shall include only those
tubes of the same size and from the same heat which are heat treated In the same furnace charge. When the final heat treatment is in a
continuous furnace the number of tubes or the same size and from the same heat In a lot shall be deternlined from the size of the lubes as
prescribed in Table 2.

NOTE 7-FOI tensile and haldness test requirements, the tenn lot applies to all tubes pnor to cutting, ot the same nom~nal dlarneter and
wall th~ckness that are produced lrom the same heat of steel When final heat treatment is in a batch-type furnace, a lot shall include only
those tubes or the same size and the same heat wh~cha re heat lreated in the same furnace charge When the final heat tredtnlent is In a
contmuous furnace, a lot shall ~nclude all tubes of the same size and heat, heat treated in the same furnace at the same temperature, t ~meat
heat, and lu~naces peed

8. Tensile Requirements
8.1 The material shall conform to the requirements as to tensile properties prescribed in Table 3.

9. Hardness Requirements
9.1 The tubes shall have a hardness number not exceeding 170 HB or 87 HRB.

10. Forming Operations
10.1 Tubes when inserted in the boiler shall stand expanding and beading without showing cracks or flaws.

11. Mechanical Tests Required
11.1 Tension Test -One tension test shall be made on a specimen for lots of not more than 50 tubes. Tension
tests shall be made on specimens from two tubes for lots of more than 50 tubes (Note 2).

11.2 Flatteizirzg Test -One flattening test shall be made on specimens from each end of one finished tube,
not the one used for the flaring or flanging test, from each lot (Note 1).
11.3 Flaring Test (Searizless Tubes) -One flaring test shall be made on specimens from each end of one finished
tube, not the one used for the flattening test, from each lot (Note 1).

11.4 Flange Test (Welded Tubes) -One flange test shall be made on specimens fsorn each end of one finished
tube, not the one used for the flattening test, from each lot (Note 1).

11.5 Hardness Test -Brine11 or Rockwell hardness tests shall be made on specimens from two tubes from
each lot (Note 2).

11.6 Reverse Flattei~ing Test -For welded tubes, one reverse flattening test shall be made on a specimen from
each 1500 ft [460 m] of finished tubing.

11.7 Hydrostatic or Noizdestructive Electric Test - Each tube shall be subjected to the hydrostatic test, or,
instead of this test, a nondestructive electric test may be used when specified by the purchaser.

12. General Re
12.1 Material furnished under this specification should conform to thc applicable rcquircmcnts of thc
cursent edition of Specification A 4501A 450M, e unless otherwise provided herein.
13. Product Marking
13.1 In addition to the marking prescribed in Specification A 4501A 450M, the marking shall include whether
hot finished or cold finished, and whether seamless or welded.

14.4 Seamless steel tube; steel tube; alloy; welded steel tube  PART A - FERROUS MATERIAL SPECIFICATIONS

Composition, %
Grade 1 Grade 2
Carbon, ma:: 0.15 0.15
Manganese, max 0.55 0.50-1.00
Phosphorus 0.06-0.16 0.04 max
Sulfur, max 0.060 0.05
Silicon, min 0.10 . . .
Copper 0.20-0.60 0.30-1.00
Chromium 0.24-1.31 . . .
Nickel 0.20-0.70 0.40-1.10
Molybdenum, min . . . 0.10
Size of Tube 2 in. C50.8 rnml and over in outside diameter and 0.200 in. C5.1 rnml and over in ?ntall
Thickness Less than 2 in. C50.8 rnml but over 1 in. C25.4 rnml in outside diameter or over 1
in. C25.4 mnil in outside diameter and under 0.200 in. C5.1 rnml in wall thickness  1 in. C25.4 rnml or less in outside diameter Size of Lot not more than 50 tubes not more than 75 tubes not more than 125


Tensile strength, min, ltsi CM Pal 60 C4151 Yield strength, min, or 50 mm, ltsi CMPal 37 C2551 Elongation in 2 in. or 50 mm, min, % 25 For longitudinal strip tests a deduction for each 1.25~ '4, in. 10.8 rnml decrease in wall thickness below 3/,, in. C8 rnml from the basic minimum elongation of the following percentage points shall be made A Calculated elongation requirements shall be rounded to the nearest whole number.





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Supplementary Requiremnets



Delivery Condition

As Rolled, Normalized, Thermomechanical Rolled / Formed, Normalized & Tempered, Quenched & Tempered, Annealed, Stress Relieved.


As Rolled, Normalized, Thermomechanical Rolled / Formed, Normalized & Tempered, Quenched & Tempered, Annealed, Stress Relieved.