SA299 GrA and A299 GrA steel are the same material, but the implementation standards are different. A299 GrA implements ASTM A299/A299M-04, SA299 GrA implements ASME SA-299/SA-299M-2015. The chemical composition and mechanical properties of SA299 GrA and A299 GrA steel are the same.
Mechanical properties of SA299 GrA and A299 GrA steel:
| Delivery status | Thickness (mm) | Mechanical properties | ||
| Hot rolled, normalized | >25-50 | Rp0.2(MPa) | ≥275 | |
| Rm(MPa) | 515-655 | |||
| A200(%) | ≥16 | A50≥19% | ||
| Impact temperature | -1 | |||
| Akv(J) | ≥20 | Longitudinal | ||
| Bending diameter | 2.5a | |||
| Bending angle | 180 | |||
| >50-75 | Rp0.2(MPa) | ≥275 | ||
| Rm(MPa) | 515-655 | |||
| A200(%) | ≥16 | A50≥19% | ||
| Impact temperature | -1 | |||
| Akv(J) | ≥20 | Longitudinal | ||
| Bending diameter | 3a | |||
| Bending angle | 180 | |||
| >75-125 | Rp0.2(MPa) | ≥275 | ||
| Rm(MPa) | 515-655 | |||
| A200(%) | ≥16 | A50≥19% | ||
| Impact temperature | 4 | |||
| Akv(J) | ≥20 | Longitudinal | ||
| Bending diameter | 3a | |||
| Bending angle | 180 | |||
Smelting Analysis of chemical composition of SA299 GrA and A299 GrA steel:
| C | Si | Mn | P | S | Ni | Cr | Mo | Cu | Nb | V | Ti | Alt | B |
| ≤0.28 | 0.15-0.4 | 0.9-1.5 | ≤0.025 | ≤0.025 | ≤0.4 | ≤0.3 | ≤0.12 | ≤0.4 | ≤0.02 | ≤0.03 | ≤0.03 | ≥0.02 | ≤0.001 |
Remarks for composition: Cr+Ni+Mo+Cu≤0.03; Cr+Mo≤0.32; Als can be used instead of Alt, at this time Als≥0.015.
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