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ASTM A851-88 / ASME SA 851 


This standard is issued under the fixed designation A 851; 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. 


1.1 This specification covers nominal-wall-thickness tubes intended for use as steam surface condenser tubes. These tubes are made from the austeitic steels listed in Table1 using a high-frequency induction welding process here post-weld solution heat treatment is not necessary for corrosion resistance.

1.2 The tubing sizes covered shall be 5/8 to in. (15.9 mm) to 3 1/8 in.(79.4 mm) in outside diameter and 0.015 to 0.019 in. (0.40 to 2.8 mm), inclusive, in wall thickness. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this specification.

1.3 Optional supplementary requirements are provided in this spcification and, when one or ore of these are desired, each shall be so states in the order. 

1.4 The values stated in inch-pound units are to be regarded as the standard.

Chemical composition

Grade Mfg. Process Chemical composition(%)
C Si Mn P S Ni Cr Mo Others
TP304 E, W 0.08Max 0.75Max 2.00Max 0.040Max 0.030Max 8.00~11.0 18.0~20.0 - -
TP304L E, W 0.08Max 0.75Max 2.00Max 0.040Max 0.030Max 8.00~11.0 18.0~20.0 - -

Mechanical Properties 

Grade Tensile Test MPa or N/mm2 Remaks (Similar to JIS) Possibility Temperature
Min Yield point Tensile Strength
TP304 205 515 -
TP304L 170 485 -

TABLE 1 Chemical Requirements

Composition, %
Grade : TP 304 TP 304L
UNS DesignationA S30400 S30403
Carbon, max 0.08 0.030
Manganese, max 2.00 2.00
Phosphorus, max 0.040 0.040
Sulfur, max 0.030 0.030
Silicon, max 0.75 0.75
Nickel 8.00-11.0 8.00-13.00
Chromium 18.0-20.0 18.0-20.0

ANew designation established in accordance with ASTM-E-527 and SAE J1086, Practice for Numbering Metals and Alloys (UNS). 
NOTE 1-For Product Analysis requriements, the term lot applies to all tubes, prior to cutting, of the same nominal size and 
wall thickness that are produced from the same heat of steel.   

TABLE 2 Tensile Requirements

Grade UNS Designation Tensile Strength min.
Yield Strength
min. ksi(MPa)
Elongation, in
2 in. or 50
mm, min, %
TP 340 S30400 75 (515) 30 (205) 35
TP 304L S30403 70 (485) 25 (170) 35


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