API 2H Grade 50 STEEL PLATES – Stockist, Suppliers & Exporters

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API 2H Grade 50(Normalized Carbon-Manganese Structural Steel Plate.)

Heat-Treated (Normalized) Structural Steel.

General Product Description.

API 2H Grade 50 is an intermediate-strength, normalized, structural steel plate used in the welded construction of offshore structures. API 2H Grade 50 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 -40°F [-40°C]. CHEMTECH is an supplies under the API Monogram Program. This product can be multi-certified to ASTM A633 Grade C, ABS DH/EH 36, ASTM A537 Class 1 and MIL-S-22698 Rev C in thicknesses to 2” [50.8 mm].


API 2H 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 2H 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.


The following API 2H Grade 50 plate sizes are available:
Thickness: 0.375” – 3.00” (9.5 mm – 76.2 mm)
Width: 72” – 123” (1,829mm – 3,124 mm)
Length: 240” – 600” (6.10m – 15.24 m)

Mechanical Properties:

Tensile Testing is performed transverse direction according to API 2H 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] 70 to 90 [483-620] 21 16
t>2.50 [63.5] 47 [324] 70 to 90 [483-620] 21 16

Charpy V-Notch Impact Testing is performed using transverse specimens in accordance with ASTM A370. 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 (wt %, max. unless indicated)

C Mn P S Si Al Cb Ti1 N2 V2 CEV
CEV t>2”
Heat 0.18 1.15-
0.030 0.010 0.05-
0.020 0.012 0.43 0.45
Product 0.22 0.015 0.05-

1. Minimum value, if any, shall be as agreed upon and stated on the order.
2. Shall not be intentionally added.

Carbon Equiralent: CEV = C + Mn/6 + Cr+Mo+V/5 + Ni+Cu/15.


Thickness, width, and length tolerances for API 2H 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 2H Grade 50 is supplied in the normalized condition.

Fabrication and Other Recommendations:

Weldability: Welding of API 2H 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


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]
>2.5” [63.5] 225°F [110°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]
>2.5” [63.5] 225°F [110°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]
>2.5” [63.5] 225°F [110°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]
>2.5” [63.5] 225°F [110°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 (Individual Plate Testing), S4 (Through-Thickness [ZDirection] Testing), S5 (Low Sulfur Steel for Improved Through-Thickness Properties), S7 (Low Nitrogen
Content for Improved Notch Toughness in Strain-Hardened Condition), S8 (Strain-Aged Charpy V—Notch Impact Tests), S12 (Notch Toughness Using Drop Weight), S13 (Surface Quality) and S14 (Thickness Tolerance)

Origin of Plates

Nippon Steel Sumitomo Metal

Arcelor Mittal

JFE Steel Corporation (Japan)
Nippon Steel & Sumitomo Metal Corporation (Japan)
 Arcelor Mittal (USA)


POSCO (South Korea)

SSAB Alabama Inc.(USA)
Kobe Steel, Ltd.(Japan)
Nucor Steel (USA)
Jindal Steel Azovstal Essar Steel

Jindal Steel Power

Azovstal Iron & Steel Works (Ukraine)