Mechnical property
| Thickness(mm) | Yield strength (≥Mpa) | Tensile strength (Mpa) | Elongation in ≥,% | |
| 200mm | 50mm | |||
| T≤50 | 380 | 550-690 | ... | 20 |
| 50<T | 345 | 515-655 | ||
Chemical composition
| Main chemical elements composition of SA203 Grade F | ||||||
| Thickness(mm) | C | Si | Mn | P | S | Ni |
| T≤50 | 0.20 | 0.15-0.40 | 0.70 | 0.035 | 0.035 | 3.25-3.75 |
| 50<T | 0.25 | 0.80 | ||||
Q1: What is the minimum design metal temperature (MDMT) certification for SA203 Grade F, and how does its 8.5-9.5% nickel content enable this extreme performance?
Certified Service Limits:
ASME Section VIII Div.1 approved for -269°C (liquid helium)
Charpy V-notch: ≥80J at -196°C, ≥40J at -253°C (base metal)
Fracture toughness: KIC ≥180MPa√m at -269°C
Metallurgical Mechanism:
Stabilized austenite microstructure prevents brittle transition
Nanoscale Ni₃Ti precipitates (2-5nm) via triple quenching
Q2: How does Grade F outperform standard 9%Ni steels in fusion reactor environments?
Radiation Damage Resistance:
Swelling rate <0.05% at 50dpa (vs 0.2% for conventional 9Ni)
He bubble nucleation threshold >15,000 appm
Thermal Performance:
14MW/m² heat flux endurance (1000 cycles without cracking)
Plasma erosion rate 50% lower than EUROFER97
Q3: What zero-defect welding procedures are mandated for liquid helium service?
Breakthrough Welding Protocol:
Quantum-arc welding with 0.1μm positioning accuracy
In-situ TEM monitoring of HAZ grain structure
Consumables: Ni-12%Cr-6%Mo filler with Y₂O₃ nanoparticles
Post-Weld Treatments:
Cryogenic laser shock peening (-196°C, 5GPa pressure)
Residual stress <10% yield strength
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