Scope

The technical conditions apply to plates of SA302GrC with thickness not more than 200mm. (8mm-200mm)

Adopt standard:

ASME SA302/SA302M Standard Specification covers manganese, molybdenum and nickel alloy steel plates intended particularly for welded boilers and other pressure vessels. ASME SA20/SA20M Standard Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling

ASME SA370 Standard Test Methods and Definitions for Mechanical Testing of Steel Products

Dimension, Shape, Weight and Permissible Deviation

The dimension, shape, weight and permissible deviation shall meet the requirements of ASME SA20/SA20M.

Thickness tolerance: +/-1.52mm

Flatness: 4mm/m

Surface shot blasting or peeled.

Technical conditions

Chemical composition (Ladle analysis)

The chemical composition of plates shall be accordance with the following table 1.

Table 1 Chemical composition (Ladle analysis)

Note: Ni+Cr+Mo+Cu+V+Nb≤0.80%.

Steel making process: EAF+LF/VD

Carbon equivalent (CEq)

Carbon equivalent shall be not more than 0.56 for plates of SA302GRC.

Carbon equivalent shall be calculated as follows:

CEq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 (%)

Mechanical properties

The mechanical properties of SA302GrC shall meet the requirement as table 2.

Table 2 Mechanical properties

Impact properties

Impact test in the longitudinal and transverse for plates of SA302GrC shall meet the requirements per table 3.

Table 3 Impact properties

Grain size

Grain size for plates shall be according to SA302GrC.

Surface quality

The surface quality of plates shall be in accordance with ASME SA20/SA20M.

Ultrasonic inspection

Plates shall be 100% ultrasonic inspected as per JB/T4730.3-2005 Level I.

Test method and inspection rules

Test items, sampling quantity, sampling method and test method shall conform to table 4.

Table 4 Test items for plates

Package, marking and certificate

Package, marking and certificate shall conform to ASME SA20/SA20M.

The third party inspection

The chemical composition, tensile test and Charpy -V impact test for plates of SA302GrC shall be witnessed.

Delivery conditions

The delivery conditions for plates of SA302GrC shall be N+T.

Other requirements:

The other requirements for plates of SA302GrC shall be in accordance with SA203.

MTC in accordance with EN10204: 2004 3.1