API 2MT1 Plates

Exporters of API 2MT1 Plates, Supplier of API 2MT1 Plates & Stockist of API 2MT1 Plates

Carbon-Manganese Steel Plate with Improved Toughness

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.

Mechanical Properties

Tensile Testing is performed transverse direction according to ASTM A6 and A370 requirements. The minimum values are tabulated below:

Thickness, t

in. [mm]

0.2% YS ksi

[MPa], min.

UTS ksi [MPa]

Elongation in 2”

[50 mm], min. %

Elongation in 8”

[200 mm], min. %

t≤2.50 [63.5]

50 [345]

65 to 90 [448-620]

23

18

Thickness, t in. [mm]

CEIIW Max

Pcm Max

CEIIW Typical

Pcm Typical

≤ 2 [50.8]

0.43

0.24

0.39

0.17

2 < t ≤ 2.5 [50.8< t ≤ 63.5]

0.45

0.25

na

na

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]

Minimum Preheat and

Interpass Temperature

Consumables

Shielded Metal Arc

(SMAW)

         Up to 1.5” [38.1]

50oF [10oC]

AWS E7015-X, E7016-X, E7018-X

  >1.5” [38.1] to 2.5” [63.5]

150°F [65°C]

Gas Metal Arc

(GMAW)

Up to 1.5” [38.1]

50oF [10oC]

AWS ER70S-X

>1.5” [38.1] to 2.5” [63.5]

150°F [65°C]

Submerged Arc

(SAW)

Up to 1.5” [38.1]

50oF [10oC]

AWS F7XX-EXXX-XX

>1.5” [38.1] to 2.5” [63.5]

150°F [65°C]

Flux Cored Arc

(FCAW)

Up to 1.5” [38.1]

50oF [10oC]

AWS E7XTX-X

>1.5” [38.1] to 2.5” [63.5]

150°F [65°C]


Charpy V-Notch Impact Testing
is performed using transverse specimens in accordance with ASTM A370 and ASTM A673 Frequency (H).

Specimen Size

in.

Specimen

Size, mm

Minimum

Average Energy ft-lb [J]

Minimum Single

Value Energy ft- lb [J]

Test Temperature °F

[°C]

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

Al,

Total

Nb

Ti1

V1

N2

B2

Zr3

Ce3

0.12

1.15-

1.60

0.030

0.010

0.10-

0.40

0.020-

0.060

0.010-

0.040

0.020

0.080

0.012

0.0005

0.010

  1. Minimum value, if any, shall be as agreed upon and stated on the order.

  2. Shall not be intentionally added.

  3. Shall not be intentionally added without specific approval of purchaser. Analysis of Ce not required if not added.