API 2W Grade 50
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General Product Description
API 2W Grade 50 is an intermediate-strength, structural steel plate, produced by thermo-mechanical control processing (TMCP),that is used in the welded construction of offshore structures. API 2W Grade 50 has a minimum yield strength of 50 ksi [345 MPa] and a minimum, mid-thickness, transverse Charpy V-notch impact toughness of 30 ft-lbf [41 J] at -40°F [-40°C]. SSAB is an API Licensee under the API Monogram Program.
Applications
API 2W Grade 50 is intended primarily for use in offshore structures in critical portions that must exhibit good impact toughness and resistance to plastic fatigue loading and lamellar tearing. The primary use of API 2W Grade 50 is in tubular joints, stiffened plate construction and other intersections where portions of the plates will be subjected to tension in the through-thickness (Z) direction.
Dimension Range
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| Thickness (inmm) |
Width (inmm) |
Length (inmm) |
|---|---|---|
| 0.500 - 1.50012.7 - 38.10 | 72 - 1231800 - 3120 | 240 - 10806100 - 27430 |
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Thickness
(inmm)
(inmm)
0.500 - 1.50012.7 - 38.10
Width
(inmm)
(inmm)
72 - 1231800 - 3120
Length
(inmm)
(inmm)
240 - 10806100 - 27430
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Dimensions: Inquire thickness <0.500” down to 0.188”, inquire thickness > 1.500”-2.000”, inquire widths <72” down to 60”.
Length: Rail shipments the maximum length of 1080” applies; for truck shipments the maximum length of 1020” applies.
Mechanical Properties
Tensile testing is performed in the transverse direction according to API 2W requirements. The required values are tabulated below:
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| Thickness (inmm) |
0.2% YS (ksi) | UTS (ksi) | Elongation in 2" (min %) |
Elongation in 8" (min %) |
|---|---|---|---|---|
| 0.500 - 1.0012.7 - 25.4 | 50 - 75 | 65 | 23 | 18 |
| 1.001 - 1.50025.43 - 38.10 | 50 - 70 | 65 | 23 | 18 |
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Comparison
Thickness
(inmm)
(inmm)
0.500 - 1.0012.7 - 25.4
0.2% YS (ksi)
50 - 75
UTS (ksi)
65
Elongation in 2"
(min %)
(min %)
23
Elongation in 8"
(min %)
(min %)
18
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Thickness
(inmm)
(inmm)
1.001 - 1.50025.43 - 38.10
0.2% YS (ksi)
50 - 70
UTS (ksi)
65
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 on each plate using mid-thickness, mid-width, transverse specimens tested in accordance with ASTM A673. The producer has the option of testing sub-size specimens to any of the combinations of specimen size, energy requirement, and test temperature as shown below:
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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 | -40 |
| 0.295 x 0.394 | 30 | 25 | -40 |
| 0.197 x 0.394 | 30 | 25 | -40 |
| 0.295 x 0.394 | 23 | 19 | -50 |
| 0.197 x 0.394 | 15 | 13 | -80 |
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Comparison
Specimen Size (in)
0.394 x 0.394
Min transverse average energy (ft-lbs)
30
Min single value (ft-lbs)
25
Test temperature(°F)
-40
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Specimen Size (in)
0.295 x 0.394
Min transverse average energy (ft-lbs)
30
Min single value (ft-lbs)
25
Test temperature(°F)
-40
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Specimen Size (in)
0.197 x 0.394
Min transverse average energy (ft-lbs)
30
Min single value (ft-lbs)
25
Test temperature(°F)
-40
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Specimen Size (in)
0.295 x 0.394
Min transverse average energy (ft-lbs)
23
Min single value (ft-lbs)
19
Test temperature(°F)
-50
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Specimen Size (in)
0.197 x 0.394
Min transverse average energy (ft-lbs)
15
Min single value (ft-lbs)
13
Test temperature(°F)
-80
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Chemical Composition
(heat analysis, wt %, max. unless indicated)
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| C (max wt %) |
Mn 1) (wt %) |
P (max wt %) |
S (max wt %) |
Si (wt %) |
Altot (wt %) |
Cr (max wt %) |
Mo (max wt %) |
Ni (max wt %) |
Cu (max wt %) |
Ti (wt %) |
Cb (wt %) |
N 2) (max wt %) |
B 2) (max wt %) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.12 | 1.15 - 1.60 | 0.020 | 0.010 | 0.05 - 0.50 | 0.020 - 0.060 | 0.25 | 0.08 | 0.75 | 0.50 | 0.007 - 0.020 | 0.04 | 0.013 3) | 0.0005 |
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C
(max wt %)
(max wt %)
0.12
Mn 1)
(wt %)
(wt %)
1.15 - 1.60
P
(max wt %)
(max wt %)
0.020
S
(max wt %)
(max wt %)
0.010
Si
(wt %)
(wt %)
0.05 - 0.50
Altot
(wt %)
(wt %)
0.020 - 0.060
Cr
(max wt %)
(max wt %)
0.25
Mo
(max wt %)
(max wt %)
0.08
Ni
(max wt %)
(max wt %)
0.75
Cu
(max wt %)
(max wt %)
0.50
Ti
(wt %)
(wt %)
0.007 - 0.020
Cb
(wt %)
(wt %)
0.04
N 2)
(max wt %)
(max wt %)
0.013 3)
B 2)
(max wt %)
(max wt %)
0.0005
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1) With API 2Z prequalification report, maximum Mn value may be increased to 2.00%.
2) Nitrogen and Boron shall not be intentionally added.
3) Nitrogen may be 0.013% max., if titanium is 0.010 to 0.02%.
Carbon Equivalent
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| Thickness (inmm) | 0.500 - 1.50012.7 - 38.10 | 1.501 - 3.50038.13 - 88.90 |
|---|---|---|
| CEIIW (max wt %) | 0.39 | 0.41 |
| CEIIW (typ wt %) | 0.36 | 0.36 |
| Pcm (max %) | 0.22 | 0.23 |
| Pcm (typ wt %) | 0.16 | 0.16 |
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Comparison
Thickness (inmm)
CEIIW (max wt %)
0.500 - 1.50012.7 - 38.10
0.39
1.501 - 3.50038.13 - 88.90
0.41
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Thickness (inmm)
CEIIW (typ wt %)
0.500 - 1.50012.7 - 38.10
0.36
1.501 - 3.50038.13 - 88.90
0.36
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Thickness (inmm)
Pcm (max %)
0.500 - 1.50012.7 - 38.10
0.22
1.501 - 3.50038.13 - 88.90
0.23
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Thickness (inmm)
Pcm (typ wt %)
0.500 - 1.50012.7 - 38.10
0.16
1.501 - 3.50038.13 - 88.90
0.16
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Tolerances
Thickness, width, and length tolerances for API 2W Grade 50 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 2W Grade 50 is supplied in the Thermo-Mechanical Control Processing (TMCP) condition.
Weldability
Welding of API 2W Grade 50 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: SR 1 (Ultrasonic Examination), SR 2 (Notch Toughness Test at Lower Temperature), SR 3 (Additional Tension Test), SR 4 (Through-Thickness [ZDirection] Testing), SR 5 (Low Sulfur Steel for Improved Through-Thickness Properties), SR 6 (Strain-Aged Charpy V—Notch Impact Tests) up to 1.000” thickness and inquire for 1.001”–1.500” thickness, SR 9 Preproduction Qualification, and SR 10 (Notch Toughness Using Drop Weight), SR 11 (Surface Quality) and SR 12 (Thickness Tolerance).