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ASTM A209 / ASME SA209 / Seamless Carbon Molybdenum Alloy Steel Boiler and Superheater Tubes supplier & distributor in India

PIPE & TUBE ASTM STANDARDS

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ASTM A209M-88 / ASME SA 209 

SEAMLESS CARBON MOLYBDENUM ALLOY STEEL BOILER 

AND SUPERHEATER TUBES

This standard is issued under the fixed designation A 209/A 209M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon ( ε) indicates an editorial change since the last revision or reapproval. 

Scope 1. 

1.1 This specification covers several grades of minimun-wall-thickness, seamless, carbon-molybdenum alloy-steel, boiler and superheater tubes.

1.2 This specification covers tubes 1/2 to 5 in. [12.7 to 127mm] inclusive, in outside diameter and 0.035 to 0.500 in. [0.9 to 12.7 mm], inclusive, in minimum wall thickness.

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

1.4 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.

TABLE 1 Chemical Requirements

Element Composition, %
Grade T1 Grade T1a Grade T1b
Carbon 0.10-0.20 0.15-0.25 0.14 max
Manganese 0.30-0.80 0.30-0.80 0.30-0.80
Phosphorus, max 0.025 0.025 0.025
Sulfur, max 0.025 0.025 0.025
Silicon 0.10-0.50 0.10-0.50 0.10-0.50
Molybdenum 0.44-0.65 0.44-0.65 0.44-0.65


TABLE 2 Number of Tubes in a Lot Heat Treated by the Continuous Process


Size of Tube Size of Lot
2 in. [50.8 mm] and over in outside diameter and 0.200 in. [5.1 mm] and over in wall thickness
not more than 50 tubes
Less than 2 in. [50.8 mm] but over 1 in. [25.4 mm] in outside diameter or over 1 in. [25.4 mm] in outside diameter and under 0.200 in. [5.1 mm] in wall thickness
not more than 75 tubes
1 in. [25.4 mm] or less in outside diameter
not more than 125 tubes

TABLE 3 Tensile Requirements


- Grade T1a Grade T1b
Tensile strength, min, psi [MPa]
Yield strength, min, psi[MPa]
Elongation in 2 in. or 50 mm min, %: 
For longitudinal strip tests a deduction shall be made for each 1/32-in. [0.8-mm] decrease in wall thickness below 5/16 in. [8 mm] from the basic minimum elongation of the following percentage 
When Standard round 2-in. or 50-mm gage length or smaller proportionally sized specimen with the gage length equal to 4D (four times the diameter) is used
53 [365] 60 [415]
28 [195] 32 [220]
30 30
1.50A 1.50A
22 22
AThe following table gives the computed minimum values:
Wall Thickness Elongation in 2 in. 50 mm, min, %B
in. mm
5/16 (0.312) 8 30
9/32 (0.281) 7.2 29
1/4 (0.250) 6.4 27
7/32 (0.219) 5.6 26
3/16 (0.188) 4.8 24
5/32 (0.156) 4 22
1/8 (0.125) 3.2 21
3/32 (0.094) 2.4 20
1/16 (0.062) 1.6 18


Note-The above table gives the computed minimum eiongation values for each 1/32-in. [0.8 mm] decrease in wall thickness. Where the wall thickness lies between two vallues shown above. the minimum elongation value shall be detemined by the following equation: E = 48t = 15.00 [E= 1.87t = 15.00] where:
E = elongation in 2 in.or [50 mm] %, and,
t = actual thickness of specimen, in. [mm].
BCalculated elongation requirements shall be rounded to the nearest whole number.

TABLE 4 Hardness Requirements


- Brinell Hardness Number (Tubes 0.200 in. [5.1 mm] and over in Wall Thickness) Rockwell Hardness Number (Tubes less than 0.200 in. [5.1mm] in Wall Thickness)
Grade T1 146 B80
Grade T1a 153 B81
Grade T1b 137 B77



Material Comparison Tables (ASTM →KS, JIS, DIN, BS, NBN, NF, UNI) 

ASTMSTANDARD UNS NO. KOREA/JAPANES

GERMAN

BRITISH FRENCH ITALIAN
KS/JIS Symbol KS/JIS Numbe Remarks DIN Type

DIN

Number

Materiral

Number

Remarks

B.S

Number

B.S Grade Remarks AFNOR Type NF Number Ramarks UNI Type UNI Number Ramarks

A 209

Seamless C-Mo Steel Boiler and Superheater Tubes

                                 
Grade T 1 K11522 STHA 12 / STBA 12 D3572 / G3462 (30)(24) 16 Mo 5   1.5423 (3a)       18 MD 4.05   (3a) 16 Mo5 5462 (37)
Grade T 1a K12023 STHA 13 /STBA 13 D3572 / G3462 (30)(24) 16 Mo 5   1.5423 (3a)           (3)     (3)

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