Tensile Requirements for ASME SA387 Grade 11 Alloy Steel Plates Class 1 Plates
| Designation: | Requirement: | Grade 11 |
| SA387 Grade 11 | Tensile strength, ksi [MPa] | 75 to 100 [515 to 690] |
| Yield strength, min, ksi [MPa]/(0.2% offset) | 43 [310] | |
| Elongation in 8 in. [200mm], min % | 18 | |
| Elongation in 2 in. [50mm], min, % | 22 | |
| Reduction of area, min % | ––– |
Chemical Requirements for ASME SA387 Grade 11 Alloy Steel Plates
| Element | Chemical Composition (%) | |
| SA387 Grade 11 | ||
| Carbon: | Heat Analysis: | 0.05 - 0.17 |
| Product Analysis: | 0.04 - 0.17 | |
| Manganese: | Heat Analysis: | 0.40 - 0.65 |
| Product Analysis: | 0.35 - 0.73 | |
| Phosphorus: | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Sulphur (max): | Heat Analysis: | 0.035 |
| Product Analysis: | 0.035 | |
| Silicon: | Heat Analysis: | 0.50 - 0.80 |
| Product Analysis: | 0.44 - 0.86 | |
| Chromium: | Heat Analysis: | 1.00 - 1.50 |
| Product Analysis: | 0.94 - 1.56 | |
| Molybdenum: | Heat Analysis: | 0.45 - 0.65 |
| Product Analysis: | 0.45 - 0.70 |
Q1: What welding procedures are critical for hydrocracker vessels?
Welding Protocol:
Preheat: 200-250°C (t>19mm)
Filler Metals: AWS A5.28 E8018-B2
Interpass Control: ≤300°C
Post-Weld Treatments:
PWHT: 705±15°C ×1hr/25mm
Hardness Limit: ≤225 HB (NACE MR0175)
Q2: How does Class 1 differ from Class 2 in SA387 Gr.11?
| Parameter | Class 1 | Class 2 |
|---|---|---|
| Heat Treatment | Normalized+Tempered | Quenched+Tempered |
| Thickness Range | ≤200mm | ≤300mm |
| Impact Toughness | ≥34J at -30°C | ≥54J at -30°C |
Q3: How is Grade 11 Cl.1 modified for sour service?
Material Prep:
Ca Treatment: Ca/S ≥1.5 for sulfide shape control
Hardness Cap: ≤200 HB via tempering at 690-720°C
Testing Requirements:
HIC Test: A≤0.5% (NACE TM0284)
SSC Test: Pass Method A at 90% AYS
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