Technical conditions for supercritical boiler plates of SA302GrC

1. Scope
The technical conditions apply to plates of SA302GrC with thickness range 10mm-120mm use of Supercritical Boiler.
2. Adopt standard:
ASME SA302/SA302M Standard Specification for Pressure Vessel Plates, Alloy Steel, Manganese-Molybdenum and Manganese-Molybdenum-Nickel
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
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

4.4 Impact properties
Impact test in the longitudinal and transverse for plates of SA302GrC shall meet the requirements per table 3.
Table 3 Impact properties
Charpy-V Impact test
Test temp.
Celsius degree Transverse
 Average impact energy
 -7.6 C Min 41J

4.5 Hardness: Max 240HV
4.6 SWHT: Simulated Post-Weld Heat Treatment of Mechanical Test Coupons shall be prepared in 600+/-10 C with min.5 minute per each mm of thickness.
4.7 Surface quality
The surface quality of plates shall be accordance with ASTM A20/A20M.
4.8 Ultrasonic inspection
Plates shall be ultrasonic inspected per ASTM A578/A578M level C.
4.9 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
Test item Quantity, Piece Sampling method Test method Sampling conditions
Ladle analysis 1 (per furnace) ASTM A20/A20M ASME SA751 /
Tensile test 1 (per rolled pc) ASTM A20/A20M ASME SA370 SWHT
Charpy-V impact test at -7.6C 3 (per rolled pc) ASTM A20/A20M ASME SA370 
Product analysis 1 (per rolled pc) ASTM A20/A20M ASME SA370 N+T
Hardness test Each product pc ASTM A20/A20M ASME SA370 
Ultrasonic test Each product pc ASTM A578/A578M 
High TEMP tensile test Each product pc ASTM A20/A20M ASME SA370 SWHT

5. Package, marking and certificate
Package, marking and certificate shall conform to A20.
6. The third party inspection
The chemical composition, tensile test and Charpy V impact test and HIC test for plates of SA302GrC shall be witnessed by surveyor of client.
7. Delivery conditions
The delivery conditions for plates of SA302GrC shall be Normalized(accept ACC)+ Tempered(temperature not less than 700 C degree.)
8. Other requirements
The other requirements for plates of SA302GrC shall be accordance with SA387/SA387M-2010.
MTC accordance with EN10204: 2004 3.1

More technical details and the MTC require please visit our web site: www.gloriasteel.com or contact us.

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