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» Application » ASTM A240 304/304L Plates | Acetic Acid Corrosion Data

ASTM A240 304/304L Plates | Acetic Acid Corrosion Data

November 3, 2020

Acetic Acid: Properties & Applications

Acetic acid, CH3COOH, also known as ethanoic acid or vinegar acid, is a clear, colorless liquid or crystalline mass with a pungent odor, a melting point of 16.7°C, and a boiling point of 118.1°C. It is miscible with water, alcohol, and ether, and it crystallizes in deliquescent needles. Acetic acid, as well as its derivatives, is produced in large quantities. It is the most important organic acid and is frequently encountered as a contaminant in other organic chemical processes. Acetic acid is classified as a weak acid, but the effective acidity in aqueous streams increases rapidly with concentration. In addition to being the active ingredient in vinegar, acetic acid is required in the production of synthetic resins and fibers, pharmaceuticals, photographic chemicals, flavorants, and bleaching and etching compounds. It is used as an active raw and intermediate material for various organic syntheses and as a solvent for organic substances.

Applications of 304/304L & Corrosion Data in Acetic Acids

SS304 CH3COOH storage tanks

Stainless steel storage tanks for acetic acids made of ASTM A240 TP304 (UNS 30400) or TP304L (UNS 30403) plates.

Type 304 stainless steel finds wide application in dilute CH3COOH and in the shipment and storage of concentrated CH3COOH. It is the lowest grade commonly used in acetic acid industry. Compared to types 316 and 317, it is also more cost effective. Data show that glacial acetic acid can be handled in 304 stainless steel to a temperature of about 80°C [175°F] and that 304ss has been satisfactory for lower concentrations to the boiling point of the acid. At temperatures above 60°C [140°F], use of the low-carbon type 304L is advisable for welded construction to prevent intergranular attack of heat-affected zones. Various storage and transportation tanks for acetic acids at ambient temperatures are generally made from ASTM A240 TP304 or TP304L plates or sheets.

Concentration
%
Temp.
°C [°F]
DurationCorrosion Rate
mm/yr [mils/yr]
ConcentratedBoiling-0.081 [3.2]
10Boiling-Resistant
6015 [60]-Resistant
60Boiling-Resistant
10021 [70]-Resistant
100Boiling-Good
20--7.5 [300]
1020 [68]-Resistant
10Boiling-Resistant
5020 [68]-Resistant
50Boiling-Good
10020 [68]-Resistant
100Boiling-Good
-20 [68]-Resistant
-Boiling-Resistant
5*A21 [70]-Resistant
10*A21 [70]-Resistant
83*B116 [241]51 days1.68 [66]
87*B122 [252]51 days1.07 [42]
98*B128 [262]51 days0.18 [7.0]
20boiling24 hours0.75 [30]
80boiling24 hours-
30-50*C106 [223]-poor
Concentrated*Dboiling-6.86 [270]
10*E20 [68]-Resistant
10*E50 [122]-Resistant
10*E90 [194]-Resistant
50boiling48 hours0.275 [11]
*Empirical corrosion behavior of type 304 in acetic acids in various concentration, temperatures, and other conditions.
*A: Aearted. *B: Data were obtained during processing of acetic acid containing ionized halogens; concentration of halide ions varied during period of observation; eliminated range of concentration, 5 to 10 ppm. *C: plus 2~10% HCOOH. *D: plus 220 ppm Cl. *E: plus 50% hydrogen peroxide.

Concentration
%
Temp.
°C [°F]
DurationCorrosion Rate
mm/yr [mils/yr]
90150 [302]30 days4.9 [193]
1020 [68]-Resistant
10Boiling-Resistant
5020 [68]-Resistant
50Boiling-Good
10020 [68]-Resistant
100Boiling-Good
-20 [68]-Resistant
-Boiling-Resistant
75*F150 [302]30 days24.2 [953]
85*G150 [302]30 days8.2 [323]
10*H20 [68]-Resistant
10*H50 [122]-Resistant
10*H90 [194]-Resistant
*Empirical corrosion behavior of type 304L in acetic acids in various concentration, temperatures, and other conditions.
*F: plus 15% formic acid. *G: plus 5% formic acid. *H:plus 50% hydrogen peroxide.

Chemical Composition of ASTM A240 TP304/TP304L

ElementTP304TP304L
C≤0.08≤0.03
Mn≤2.00≤2.00
P≤0.045≤0.045
S≤0.030≤0.030
Si≤0.75≤0.75
Ni8.0-11.08.0-12.0
Cr18.0-20.018.0-20.0
N≤0.10≤0.10
*Base on both heat and product analysis.

Mechanical Properties of ASTM A240 TP304/TP304L

Mechanical
Requirements
TP304TP304L
Tensile Strength,
min. MPa [ksi]
515 [75]485 [70]
Yield Strength,
min. MPa [ksi]
205 [30]170 [25]
Elongation in
2" min. %
4040
Brinell Hardness
max. HBW
201201
Rockwell Hardness
Max. HRBW
9292
*Charpy V-notch test may be performed upon client’s requirements.

Supply Chain & Cooperation

Shijiazhuang Metalsin holds large inventory of ASTM A240 TP304 & TP304L plates and sheets from several prominent steel mills in China including BAOSTEEL, TISCO, TSINGSHAN, and JISCO. Any inquiry, please feel free to contact our sales team at sales@juanbang58.icu and info@juanbang58.icu. For project bidding, we can act as your China local agent to coordinate with big steel mills.

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