Chemical composition and mechanical properties of SA203Gr.D, an American grade of pressure vessel steel.
SA203Gr.D Approximate Grade Lookup Table
SA203Gr.D Chemical Composition
| Element | Thickness | Grade.D | ||||||||
| C,≤① | thickness≤2in.(50mm) | 0.17 | ||||||||
| thickness＞2-4in.(100mm) | 0.2 | |||||||||
| thickness＞4in.(100mm) | ... | |||||||||
| Mn，≤ | Smelting Analysis | |||||||||
| thickness≤2in.(50mm) | 0.7 | |||||||||
| thickness≤2in.(50mm) | 0.8 | |||||||||
| Finished Product Analysis | ||||||||||
| thickness≤2in.(50mm) | 0.78 | |||||||||
| thickness＞2in.(50mm) | 0.88 | |||||||||
| P,≤① | 0.025 | |||||||||
| S,≤① | 0.025 | |||||||||
| Si | Smelting Analysis | 0.15-0.40 | ||||||||
| Finished Product Analysis | 0.13-0.45 | |||||||||
| Ni | Smelting Analysis | 3.25-3.75 | ||||||||
| Finished Product Analysis | 3.18-3.82 | |||||||||
①Both smelting analysis and finished product analysis are applicable.
SA203Gr.D Mechanical Properties
| Mechanical Properties | Thickness | Gr.D | ||||||||
| Tensile strength（MPa） | thickness≤2in.(50mm) | 450-585 | ||||||||
| thickness＞2in.(50mm) | 450-585 | |||||||||
| Yield strength（MPa）≥ | thickness≤2in.(50mm) | 255 | ||||||||
| thickness＞2in.(50mm) | 255 | |||||||||
| Elongation (gauge length 8 in. or 200 mm), %≥ ① | 19 | |||||||||
| Elongation (gauge length 2 in. or 50 mm), %≥ ①② | 23 | |||||||||
①For adjustments to elongation, please refer to the A20/A20M standard.
②See section 7.1.1