API 2H Grade 50 Steel For Shipbuilding Plate

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API 2H Grade 50 Steel For Shipbuilding Plate

2026-01-05

What is API 2H Grade 50 Steel？

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-lb [41 J] at -40°F [-40°C]. SSAB is an API Licensee under the API Monogram Program. This product can be multicertified to ASTM A633 Grade C, ABS DH/EH 36, ASTM A537 Class 1 and MIL-S-22698 DH36 Rev C in thicknesses to 2” [50.8 mm].

What is equivalent to an API 2H GR 50 plate?

ANSWER: Equivalent grades to this grade are EN10225:S355, EN10225:S420, EN10225:S460, API 2H, and API 2W.

API Spec 2H Grade 50 Mechanical Properties

Tensile testing is performed in the transverse direction according to API 2H requirements. The mechanical property requirements are tabulated below:

Thickness (in)	UTS (ksi)	Elongation in 2″ (min %)	Elongation in 8″ (min %)
0.250 – 2.50	70 – 90	21	16
2.501 – 3.00	70 – 90	21	16

Impact Properties

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)	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

API 2HGR50 Steel Plate Chemical Composition

(wt. %, maximum, unless indicated)

C (max wt %)	Mn (wt %)	P (max wt %)	S (max wt %)	Si (wt %)	Al (wt %)	Ti 1) (wt %)	Cb (wt %)	N (max %)
0.18	1.15 – 1.60	0.030	0.010	0.05 – 0.40	0.02 – 0.06	0.020	0.01 – 0.04	0.012 2)

¹⁾ Minimum value, if any, shall be as agreed upon and stated on the order.

²⁾ Shall not be intentionally added.

Application

API 2H Gr50 steel plate produced to this specification are used for welded construction of offshore structures in selected critical sections that must exhibit good impact properties and resistance to fatigue and through-thickness or lamellar tearing. The primary use of these steels is in tubular joints, stiffened plate construction, and other intersections whereportions of the plates will be subjected to tension in the through-thickness (Z) direction.

Get a valued quotation for API 2H Gr50 platform steel plate, NOW CONTACT GNEE STEEL.

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