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API 2W Grade 50 – TMCP Structural Steel Plates.

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.

Dimensions:
The following API 2W Grade 50 plate sizes are available:
Thickness: 0.500” – 1.50” (12.7 mm – 38.1 mm); Inquire for > 1.50” to 2.00 [<38.1 to 50.8 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 API 2W requirements. The minimum
values are tabulated below:

Thickness, t
in. [mm] 
0.2% YS ksi [MPa] UTS ksi [MPa],
min. 
Elongation in 2”
[50 mm], min. %
Elongation in 8”
[200 mm], min. % 
t≤1.00 [25.4] 50 – 75 [345 – 517] 65 [448] 23 18
t>1.00 [25.4] 50 – 70 [345 – 483] 65 [448] 23 18

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:

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] -40 [-40]
0.295 x 0.394 7.5 x 10 30 [41] 25 [34] -40 [-40]
0.197 x 0.394 5 x 10 30 [41] 25 [34] -40 [-40]
0.295 x 0.394 7.5 x 10 23 [31] 19 [26] -50 [-46]
0.197 x 0.394 5 x 10 15 [20] 13 [18] -80 [-62]

Chemical Composition (Heat Analysis, wt %, max. unless indicated)

C Mn1 P S Si Al, Total Ni Cr Mo Cu Ti Cb N2,3 B2
0.16 1.15-
1.60
0.03 0.010 0.05-
0.50
0.020-
0.060
0.75 0.25 0.08 0.35 0.007-
0.02
0.03 0.012 0.0005

1. Manganese up to 1.65 (heat analysis) is permitted at the option of the material manufacturer
2. Nitrogen and Boron shall not be intentionally added
3. Nitrogen may be 0.013% max., if titanium if 0.010 to 0.012%

Thickness, t,  in. [mm] CEIIW Max Pcm Max CEIIW Typical Pcm Typical
≤ 1.5 [40] 0.39 0.22 0.36 0.16
1.5 < t ≤  3.5
[40 <  t ≤ 90]
0.41 0.23 na na

CEIIM = C + Mn/6 + Cr+Mo+V/5 + Ni+Cu/15 Pcm = C + Si /30+ Mn+Cu+Cr/20 + Ni/60 + Mo/15 + V/10 + 5B

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 Condition
API 2W Grade 50 is supplied in the Thermo-Mechanical Control Processing (TMCP) condition.

Fabrication and Other Recommendations
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.

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]

Supplementary Requirements
By agreement between the purchaser and plate manufacturer, the following Supplementary Requirements may be specified on the purchase order: S1 (Ultrasonic Examination), S2 (Notch Toughness Test at Lower Temperature), S3 (Additional Tension Test), S4 (Through-Thickness [Z- Direction] Testing), S5 (Low Sulfur Steel for Improved Through-Thickness Properties), S7 (Low Nitrogen Content for Improved Notch Toughness in Strain-Aged Condition), S8 (Strain-Aged Charpy V—Notch Impact Tests), S11 Preproduction Qualification, and S12 (Notch Toughness Using Drop Weight), S13 (Surface Quality) and S14 (Thickness Tolerance).

 

Voestalpine(Austria)

Nippon Steel & Sumitomo Metal Corporation (Japan)

  Arcelor Mittal (USA)

 

 

 

 

Kobe Steel, Ltd.(Japan)

     

JINDAL STEEL AND POWER LTD (USA)

Azovstal Iron & Steel Works (Ukraine)

M/s ESSAR STEEL INDIA LIMITED (India)

 JINDAL STEEL AND POWER LTD (India)