| SA202 Grade B Chemical Composition | |||||
| Grade | The Element Max (%) | ||||
| C | Si | Mn | P | S | |
| SA202 Grade B | 0.25 | 0.54-0.90 | 0.97-1.52 | 0.035 | 0.035 |
| Grade | SA202 Grade B Mechanical Property | |||
| Thickness | Yield | Tensile | Elongation | |
| SA202 Grade B | mm | Min Mpa | Mpa | Min % |
| 6-50 | 325 | 587-760 | 18% | |
| 50-100 | 325 | 587-760 | 15% | |
Q1: What temperature-pressure service limits distinguish SA202 Grade B?
ASME Section VIII Div.1 Certification:
Maximum Temperature: 345°C (650°F) for sustained operation
Pressure Rating: Up to 10MPa at 300°C (UTS≥485MPa)
Hydrogen Service: Compliant with NACE MR0175 up to 230°C
Special Testing: Requires stress rupture testing (>100hrs at 450°C)
Q2: How does the Cr-Mo composition enhance performance?
Alloy Design:
Chromium (Cr): 0.50-0.80% (oxidation resistance)
Molybdenum (Mo): 0.45-0.60% (creep strength)
Vanadium (V): 0.02-0.10% (precipitation hardening)
Microstructural Benefits:
Tempered bainite structure with 300-350 HV hardness
Creep rupture strength: 100MPa at 100,000hrs (500°C)
Q3: What welding procedures are critical for hydrocracker vessels?
Hydrogen Service Welding Protocol:
Preheat: 200-250°C (monitored via thermocouples)
Consumables: AWS A5.28 E8018-B2 (2.25Cr-1Mo)
Interpass control: ≤300°C with 15-25kJ/cm heat input
Post-Weld Treatments:
Mandatory PWHT: 675-705°C for 1hr/25mm thickness
Hardness control: ≤225HB in HAZ
Hot Tags: asme sa202 grade b for pressure vessel plate, China asme sa202 grade b for pressure vessel plate manufacturers, suppliers, factory, C15 Carbon Steel Round Bar, Hot Rolled Boiler Pressure Vessel Plate, Pressure Vessel Steel
