API 2MT1

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    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 primarilyfor 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.

    Dimension Range

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      Thickness
      (inchesmm)
      Width
      (inchesmm)
      Length
      (inchesmm)
      0.375 - 2.009.52 - 50.8 72 - 1231800 - 3120 240 - 10806100 - 27430
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        Dimensions: Inquire thickness <0.375", inquire widths <72" down to 60".

        Length: Rail shipments the maximum length of 1080" applies; for truck shipments the maximum length of 1020" (25,908mm) applies.

        Mechanical Properties

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

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          Thickness
          (inchesmm)
          0.2% YS
          (ksi)
          UTS
          (ksi)
          Elongation in 2"
          (min %)
          Elongation in 8"
          (min %)
          0.375 - 2.009.52 - 50.8 50 65 - 90 23 18
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            Impact Properties

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

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              Specimen Size
              (inches)
              Min transverse average energy
              (ft-lbs)
              Min single value
              (ft-lbs)
              Test temperature
              (°F)
              0.394 x 0.394 30 25 0
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                Chemical Composition

                (wt. %, maximum, unless indicated)

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                  C
                  (max wt %)
                  Mn
                  (wt %)
                  P
                  (max wt %)
                  S
                  (max wt %)
                  Si
                  (wt %)
                  Altot
                  (%)
                  Nb
                  (wt %)
                  Ti
                  (wt %)
                  V
                  (max wt %)
                  N
                  (max wt %)
                  B
                  (max wt %)
                  Ce
                  (max %)
                  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
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                    Carbon Equivalent CET(CEV)

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                      Thickness (inchesmm) 0.375 - 2.009.52 - 50.8
                      CEIIW (max wt %) 0.43
                      CEIIW (typ wt %) 0.39
                      Pcm (max %) 0.24
                      Pcm (typ wt %) 0.17
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                        Thickness (inchesmm)
                        CEIIW (max wt %)
                        0.375 - 2.009.52 - 50.8
                        0.43
                        Thickness (inchesmm)
                        CEIIW (typ wt %)
                        0.375 - 2.009.52 - 50.8
                        0.39
                        Thickness (inchesmm)
                        Pcm (max %)
                        0.375 - 2.009.52 - 50.8
                        0.24
                        Thickness (inchesmm)
                        Pcm (typ wt %)
                        0.375 - 2.009.52 - 50.8
                        0.17

                        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 Conditions

                        API 2MT1 steel plate is supplied in the as-rolled (hot rolled or controlled rolled) or TMCP condition.

                        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.

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                          Welding process Thickness
                          (in. [mm])
                          Minimum Preheat and Interpass Temperature
                          (°F [°C])
                          Consumables
                          Shielded Metal Arc (SMAW) Up to 1.5 [38.1] 50 [10] AWS E7015-X, E7016-X, E7018-X
                          Shielded Metal Arc (SMAW) >1.5 – 2.5 [>38.1 – 63.5] 150 [65] AWS E7015-X, E7016-X, E7018-X
                          Gas Metal Arc (GMAW) Up to 1.5 [38.1] 50 [10] AWS ER70S-X
                          Gas Metal Arc (GMAW) >1.5 – 2.5 [>38.1 – 63.5] 150 [65] AWS ER70S-X
                          Submerged Arc (SAW) Up to 1.5 [38.1] 50 [10] AWS F7XX-EXXX-XX
                          Submerged Arc (SAW) >1.5 – 2.5 [>38.1 – 63.5] 150 [65] AWS F7XX-EXXX-XX
                          Flux Cored Arc (FCAW) Up to 1.5 [38.1] 50 [10] AWS E7XTX-X
                          Flux Cored Arc (FCAW) >1.5 – 2.5 [>38.1 – 63.5] 150 [65] AWS E7XTX-X
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                            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]).