API 2Y Grade 50

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General Product Description

API 2Y Grade 50 is a quenched and tempered structural steel having intermediate-strength typically used in the welded construction of offshore structures. API 2Y 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].

Applications

API 2Y Grade 50 is intended primarilyfor 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 2Y 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

Grade
Grade
2Y Grade 50
Product type
Mill Plate
Thickness
(inmm)
0.188 - 2.004.78 - 50.8
Width
(inmm)
72 - 1201800 - 3050
Length
(inmm)
240 - 5886100 - 14900

Thickness: Thicknesses of 0.188 inches up to and including 1.50 inches can be offered with the S8 Supplement. Thicknesses over 1.50 inches up to and including 2.0 inches can be offered without the S8 Supplement.

Length: Inquire for lengths outside the noted range.

Mechanical Properties

Tensile testing is performed in the transverse direction according to API 2Y requirements. The required values are tabulated below:

Thickness
(inmm)
Thickness
(inmm)
0.188 - 1.004.78 - 25.4
0.2% YS
(ksi)
50 - 75
UTS
(ksi)
65
Elongation in 2"
(min %)
23
Elongation in 8"
(min %)
18
Thickness
(inmm)
Thickness
(inmm)
1.001 - 2.0025.43 - 50.8
0.2% YS
(ksi)
50 - 70
UTS
(ksi)
65
Elongation in 2"
(min %)
23
Elongation in 8"
(min %)
18

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:

Specimen Size
(in)
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
Specimen Size
(in)
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
Specimen Size
(in)
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

Chemical Composition

(heat analysis, wt %, max. unless indicated)

C
(max wt %)
C
(max wt %)
0.12
Mn
(wt %)
1.15 - 1.60
P
(max wt %)
0.030
S
(max wt %)
0.010
Si
(wt %)
0.05 - 0.50
Altot
(wt %)
0.020 - 0.060
Cr
(max wt %)
0.25
Mo
(max wt %)
0.08
Ni
(max wt %)
0.75
Cu
(max wt %)
0.35
Ti
(wt %)
0.007 - 0.020
Cb
(wt %)
0.03
N 1)
(max wt %)
0.012 2)
B 1)
(max wt %)
0.0005

1) Nitrogen and Boron shall not be intentionally added.

2) Nitrogen may be 0.013% max., if titanium is 0.010 to 0.02%.

Carbon Equivalent

Thickness (inmm)
Thickness (inmm)
CEIIW (max wt %)
0.188 - 1.504.78 - 38.1
0.39
1.51 - 2.0038.4 - 50.8
0.41
Thickness (inmm)
Thickness (inmm)
CEIIW (typ wt %)
0.188 - 1.504.78 - 38.1
0.36
1.51 - 2.0038.4 - 50.8
0.36
Thickness (inmm)
Thickness (inmm)
Pcm (max %)
0.188 - 1.504.78 - 38.1
0.22
1.51 - 2.0038.4 - 50.8
0.23
Thickness (inmm)
Thickness (inmm)
Pcm (typ wt %)
0.188 - 1.504.78 - 38.1
0.16
1.51 - 2.0038.4 - 50.8
0.16

Tolerances

Thickness, width, and length tolerances for API 2Y Grade 50 steel plate are in accordance with the requirements of ASTM A6. The flatness tolerance for as- supplied product is ½ ASTM A6.

Weldability

Welding of API 2Y Grade 50 shall be performed in accordance with the applicable welding code(s). Special welding consumables and welding procedures may be needed to meet specific requirements for a given application. Low hydrogen practices are strongly recommended, including the removal of surface moisture. For additional welding information, please contact your SSAB representative.

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) inquire up to 1.500” thickness and inquire for >1.500”–2.000” thickness, S9 (SPWHT) inquire, S10 (Hardness testing) inquire, and S12 (Notch Toughness Using Drop Weight) inquire, S13 (Surface Quality) inquire and S14 (Thickness Tolerance) inquire.

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