API 2MT1
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API Offshore Structural Steel Grades
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API 2MT1
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 (inmm) |
Width (inmm) |
Length (inmm) |
|---|---|---|
| 0.375 - 2.009.52 - 50.8 | 72 - 1231800 - 3120 | 240 - 10806100 - 27430 |
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Thickness
(inmm)
(inmm)
0.375 - 2.009.52 - 50.8
Width
(inmm)
(inmm)
72 - 1231800 - 3120
Length
(inmm)
(inmm)
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 (inmm) |
UTS (ksi) | Elongation in 2" (min %) |
Elongation in 8" (min %) |
|---|---|---|---|
| 0.375 - 2.009.52 - 50.8 | 65 - 90 | 23 | 18 |
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Thickness
(inmm)
(inmm)
0.375 - 2.009.52 - 50.8
UTS (ksi)
65 - 90
Elongation in 2"
(min %)
(min %)
23
Elongation in 8"
(min %)
(min %)
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 (in) | 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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Specimen Size (in)
0.394 x 0.394
Min transverse average energy (ft-lbs)
30
Min single value (ft-lbs)
25
Test temperature(°F)
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 1) (%) |
Nb (wt %) |
Ti 2) (wt %) |
V 2) (max wt %) |
N (max wt %) |
Ce (max %) |
B (max wt %) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 3) | 0.010 4) | 0.0005 3) |
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Comparison
C
(max wt %)
(max wt %)
0.12
Mn
(wt %)
(wt %)
1.15 - 1.60
P
(max wt %)
(max wt %)
0.030
S
(max wt %)
(max wt %)
0.010
Si
(wt %)
(wt %)
0.10 - 0.40
Altot 1)
(%)
(%)
0.020 - 0.060
Nb
(wt %)
(wt %)
0.010 - 0.040
Ti 2)
(wt %)
(wt %)
0.020
V 2)
(max wt %)
(max wt %)
0.080
N
(max wt %)
(max wt %)
0.012 3)
Ce
(max %)
(max %)
0.010 4)
B
(max wt %)
(max wt %)
0.0005 3)
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1) Analyzed for either total aluminum or soluble aluminum. The soluble aluminum range is 0.015 to 0.055%.
2) Minimum value, if any, shall be as agreed upon and stated on the order.
3) Shall not be intentionally added.
4) Shall not be intentionally added without specific approval of purchaser. Analysis of Ce not required if not added.
Carbon Equivalent
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| Thickness (inmm) | 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 (inmm)
CEIIW (max wt %)
0.375 - 2.009.52 - 50.8
0.43
Thickness (inmm)
CEIIW (typ wt %)
0.375 - 2.009.52 - 50.8
0.39
Thickness (inmm)
Pcm (max %)
0.375 - 2.009.52 - 50.8
0.24
Thickness (inmm)
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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Comparison
Welding process
Shielded Metal Arc (SMAW)
Thickness(in. [mm])
Up to 1.5 [38.1]
Minimum Preheat and Interpass Temperature (°F [°C])
50 [10]
Consumables
AWS E7015-X, E7016-X, E7018-X
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Welding process
Shielded Metal Arc (SMAW)
Thickness(in. [mm])
>1.5 – 2.5 [>38.1 – 63.5]
Minimum Preheat and Interpass Temperature (°F [°C])
150 [65]
Consumables
AWS E7015-X, E7016-X, E7018-X
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Welding process
Gas Metal Arc (GMAW)
Thickness(in. [mm])
Up to 1.5 [38.1]
Minimum Preheat and Interpass Temperature (°F [°C])
50 [10]
Consumables
AWS ER70S-X
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Welding process
Gas Metal Arc (GMAW)
Thickness(in. [mm])
>1.5 – 2.5 [>38.1 – 63.5]
Minimum Preheat and Interpass Temperature (°F [°C])
150 [65]
Consumables
AWS ER70S-X
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Welding process
Submerged Arc (SAW)
Thickness(in. [mm])
Up to 1.5 [38.1]
Minimum Preheat and Interpass Temperature (°F [°C])
50 [10]
Consumables
AWS F7XX-EXXX-XX
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Welding process
Submerged Arc (SAW)
Thickness(in. [mm])
>1.5 – 2.5 [>38.1 – 63.5]
Minimum Preheat and Interpass Temperature (°F [°C])
150 [65]
Consumables
AWS F7XX-EXXX-XX
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Welding process
Flux Cored Arc (FCAW)
Thickness(in. [mm])
Up to 1.5 [38.1]
Minimum Preheat and Interpass Temperature (°F [°C])
50 [10]
Consumables
AWS E7XTX-X
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Welding process
Flux Cored Arc (FCAW)
Thickness(in. [mm])
>1.5 – 2.5 [>38.1 – 63.5]
Minimum Preheat and Interpass Temperature (°F [°C])
150 [65]
Consumables
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]).