Structural Steel Product Data Sheet 2012 04 01 P a g e | 1 API 2MT1
Carbon-Manganese Steel Plate with Improved Toughness
General Product Description
API 2MT1 is an intermediate-strength structural steel plate used in the welded construction of offshore
structures. API 2MT1 has a minimum yield strength of 50 ksi [345 MPa] and a minimum transverse
Charpy V-notch impact toughness of 30 ft-lbf [41 J] at 0°F [-18°C]. SSAB is an API Licensee under the
API Monogram Program.
Applications: API 2MT1 is intended primarily for use in offshore structures for Class “B” applications as
defined in API RP 2A. API 2MT1 steel plates are suitable for use in select portions of offshore structures
which must resist impact and plastic fatigue loading but are not subjected to substantial through-thickness
(Z-direction) stresses.
Dimensions: The following API 2MT1 plate sizes are available:
Thickness: 0.500” – 2.000” (12.7 mm – 50.8 mm); inquire >2” to 2.5” [50.8 mm to 63.6 mm]
Width: 72” - 123” (1,829mm - 3,124 mm)
Length: 240” - 1080” (6.10m – 27.43 m)
Mechanical Properties
Tensile Testing is performed transverse direction according to ASTM A6 and A370 requirements. The
minimum values are tabulated below:
Thickness, t
0.2% YS ksi
UTS ksi [MPa]
Elongation in 2”
Elongation in 8”
in. [mm]
[MPa], min.
[50 mm], min. %
[200 mm], min. %
t≤2.50 [63.5]
50 [345]
65 to 90 [448-620]
23
18
Charpy V-Notch Impact Testing is performed using transverse specimens in accordance with ASTM
A370 and ASTM A673 Frequency (H).
Specimen Size
Specimen
Minimum
Minimum Single Test Temperature °F
in.
Size, mm
Average Energy
Value Energy ft[°C]
ft-lb [J]
lb [J]
0.394 x 0.394
10 x 10
30 [41]
25 [34]
0 [-18]
Chemical Composition (Heat analysis, wt %, max. unless indicated)
C
Mn
P
S
Si
0.12
1.151.60
0.030
0.010
0.100.40
1.
2.
3.
Al,
Total
0.0200.060
1
Nb
Ti
0.0100.040
0.020
1
2
2
V
N
B
0.080
0.012
0.0005
3
Zr
Ce
3
0.010
Minimum value, if any, shall be as agreed upon and stated on the order.
Shall not be intentionally added.
Shall not be intentionally added without specific approval of purchaser. Analysis of Ce not required if not added.
Thickness, t in. [mm]
≤ 2 [50.8]
2 < t ≤ 2.5
[50.8< t ≤ 63.5]
CEIIW Max
0.43
0.45
Pcm Max
0.24
0.25
CEIIW Typical
0.39
na
www.ssab.com Pcm Typical
0.17
na
5
Structural Steel Product Data Sheet 2012 04 01 P a g e | 2 Tolerances
Thickness, width, and length tolerances for API 2MT1 steel plate are in accordance with the requirements
of ASTM A6. The flatness tolerance for as-supplied product is ½ ASTM A6.
Delivery Condition
API 2MT1 steel plate is supplied in the as-rolled (hot rolled or controlled rolled) or TMCP condition.
Fabrication and Other Recommendations
Weldability: Welding of API 2MT1 shall be performed in accordance with the applicable welding code.
In the absence of a specified welding code, the following suggested minimum preheat and interpass
temperatures and welding consumables are provided. Special welding consumables and welding
procedures may be required to match the base metal toughness. Low hydrogen practices are strongly
recommended, including the removal of surface moisture.
Welding Process
Thickness, in [mm]
Shielded Metal Arc
(SMAW)
Gas Metal Arc
(GMAW)
Submerged Arc
(SAW)
Flux Cored Arc
(FCAW)
Up to 1.5” [38.1]
>1.5” [38.1] to 2.5” [63.5]
Up to 1.5” [38.1]
>1.5” [38.1] to 2.5” [63.5]
Up to 1.5” [38.1]
>1.5” [38.1] to 2.5” [63.5]
Up to 1.5” [38.1]
>1.5” [38.1] to 2.5” [63.5]
Minimum Preheat and
Interpass Temperature
50oF [10oC]
150°F [65°C]
50oF [10oC]
150°F [65°C]
50oF [10oC]
150°F [65°C]
50oF [10oC]
150°F [65°C]
Consumables
AWS E7015-X, E7016-X,
E7018-X
AWS ER70S-X
AWS F7XX-EXXX-XX
AWS E7XTX-X
Supplementary Requirements
By agreement between the purchaser and plate manufacturer, the following Supplementary
Requirements may be specified on the purchase order: S1 (Ultrasonic Examination), S9 (Simulation of
Post-Weld Heat Treatment), S13 (Surface Quality), S14 (Thickness Tolerance) and S15 (Manufacturing
Procedure Specification [MPS]).
Contact Information
For sales information, please call 877-294-3858 (Southern USA & Mexico), 800-340-5566 (Western and
Central USA), 800-383-9031 (North Central USA), and 888-576-8530 (Northeast USA & Canada) or
consult www.ssab.com.
www.ssab.com