Used For AP1000 Nuclear power plant SA738GrB steel plate 1. standard:
ASME SA738/SA738M Standard Specification for Pressure Vessel Plates, Heat-Treated, Carbon-Manganese-Silicon Steel, for Moderate and Lower Temperature Service
ASME SA20/SA20M Standard Specification for General Requirements for Steel Plates for Pressure Vessels
ASME SA370 Standard Test Methods and Definitions for Mechanical Testing of Steel Products
2. Dimension, Shape, Weight and Permissible Deviation
The dimension, shape, weight and permissible deviation shall meet the requirements of ASME SA-738/SA-738M 3. Technical conditions
3.1 Chemical composition
The chemical composition of plates shall be accordance with the following table 1.
Table 1 Chemical composition
Type C Si Mn P S Mo
Ladle analysis Max 0.20 0.15- 0.55 0.90- 1.50 Max 0.030 Max 0.030 Max 0.20
Product analysis Max 0.20 0.13- 0.60 0.84- 1.60 Max 0.030 Max 0.030 Max 0.21
Type Cu Cr V Nb Ni Nb+V
Ladle analysis Max 0.35 Max 0.30 Max 0.07 Max 0.04 Max 0.60 Max 0.08
Product analysis Max 0.38 Max 0.30 Max 0.08 Max 0.05 Max 0.63 Max 0.10
3.2 Steel making process: EAF+LF/VD
3.3 Tensile properties
The SWHT properties of SA738GrB shall meet the requirement as table 2&3.
Table 2 Tensile properties
Test Temp. Yield strength MPa Tensile strength MPa Elongation %
Room temp. Min 415 585-705 Min 20
4.4 Impact properties
Impact test in the longitudinal and transverse for plates of SA738GrB shall meet the requirements per table 3.
Table 3 Impact properties
Transverse test at -18ºC
Thickness Average impact energy
=<16 Actual measured value
>16<25 Min 20J, single value min 15J
>25<38 Min 25J, single value min 20J
>38<64 Min 35J, single value min 30J
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