supercritical boiler plates of SA302GrC

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Posted On

4-Dec-13

Product Details

s for Mechanical Testing of Steel Products
3. Dimension, Shape, Weight and Permissible Deviation
The dimension, shape, weight and permissible deviation shall meet the requirements of ASME SA20/SA20M.
The thickness toleration: -0.25mm/+3.5mm
4. Technical conditions
4.1 Chemical composition (Ladle analysis)
The chemical composition of plates shall be accordance with the following table 1.
Table 1 Chemical composition (Ladle analysis)
Thickness
mm C Si Mn P S Ni Mo
Ladle analysis Max 0.23 0.15- 0.40 1.15- 1.50 Max 0.020 Max 0.010 0.40- 0.70 0.45- 0.60
Product analysis Max 0.23 0.13- 0.45 1.07- 1.62 Max 0.020 Max 0.010 0.37- 0.73 0.41- 0.64

Note:
1) Ladle analysis sampling per furnace and product analysis per each PC finished product.
2) Thickness less than 25mm, the element C content less than 0.20%.
3) Carbon equivalent (CEq)
Carbon equivalent shall be not more than 0.58% for plates of SA302C.
Carbon equivalent shall be calculated as follows:
CEq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 (%)

4.2 Steel making process: EAF+LF/VD
4.3 Mechanical properties
The mechanical properties of SA302GrC shall meet the requirement as table 2&3.
Table 2 Tensile properties
Tensile TEMP Yield strength MPa Tensile strength MPa Elongation % Bend test
D=3a
Room Temp +20C Min 345 550-690 Min 22 180C un-cracked
High Temp tensile test Min 289 Min 427 Testing at +325 Celsius degree

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