AAR TC 128 B

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General Product Description

AAR TC128 is a high-strength, carbon manganese steel plate for use in fusion-welded tank car tanks with a specified minimum yield strength of 50 ksi. The steel is produced to a fine grain practice and is available to a maximum thickness of 1 in. AAR TC128 is furnished in the as-rolled or normalized condition. When designated for low temperature service, the steel is provided in the normalized condtion with specified low temperature Charpy-V notch impact properties.

Dimension Range

Grade
Grade
TC128 B
Product type
As-rolled
Thickness
(in)
0.250 - 1.000
Width
(in)
60 - 120
Length
(in)
240 - 1020
Grade
Grade
TC128 B
Product type
Normalized
Thickness
(in)
0.250 - 0.374
Width
(in)
60 - 120
Length
(in)
240 - 600
Grade
Grade
TC128 B
Product type
Normalized
Thickness
(in)
0.375 - 1.000
Width
(in)
60 - 120
Length
(in)
240 - 600

Thickness: Inquire for thickness less than 0.375 in.

Width: Inquire for widths greater than 120 in.

Mechanical Properties

Tensile testing is performed in the transverse direction in accordance with ASTM A20. Specimens for tensile testing are prepared from material in the condition specified for plate use such as as-rolled, normalized, or post weld heat treated. The required tensile property requirements are tablulated below:

Grade
Grade
TC128 B
Thickness
(in)
0.250 - 1.000
Yield strength
(min ksi)
50
Tensile strength
(ksi)
81 - 101
Elongation in 2" 1)
(min %)
22
Elongation in 8" 1)
(min %)
16

1) See AAR Specifications for Tank Cars for elongation adjustments.

Impact Properties

Grade
Grade
TC128 B
Min. impact energy for longitudinal testing,
Charpy V 0.393x0.393" test specimen 1)
15 ft-lbs / -50 °F 2)

1) For normalized plates, inquire for impact energy requirements in as-rolled condition.

2) Inquire for requirements at other temperatures.

Chemical Composition

Grade
Grade
TC128 B
C
(max wt %)
0.24
Mn
(wt %)
1.00 - 1.65
P
(max wt %)
0.025
S
(max wt %)
0.009
Al 1)
(wt %)
0.015 - 0.060
Si 2)
(wt %)
0.15 - 0.40
Nb
(max wt %)
0.020
Ti
(max wt %)
0.020
V
(max wt %)
0.080
B
(max wt %)
0.0005
N
(max wt %)
0.010

1) A minimum of 0.015% must be acid-soluble.

2) Silicon range is 0.15 - 0.50 for thickness 0.751 - 1.000.
Tin (Sn) maximum of 0.020, Cu maximum of 0.35.
Cu + Ni + Cr + Mo max 0.65
Nb + V + Ti max 0.11.
Ti/N ratio max 4:1.

Carbon Equivalent

Thickness (in)
Thickness (in)
Maximum CEV (wt %)
0.250 - 1.000
0.53