A387 Gr.5
Data verifiedASTM A387 Grade 5 is the 5Cr-0.5Mo pressure-vessel plate for the hottest, most corrosive refinery duties, where its chromium content resists sulfidation and hot hydrogen attack that would destroy lower-alloy plate. It is the plate counterpart of P5 pipe.
Chemical composition
| Element | Content (%) |
|---|---|
| C | ≤0.15 |
| Si | ≤0.50 |
| Mn | 0.30–0.60 |
| P | ≤0.025 |
| S | ≤0.025 |
| Cr | 4.00–6.00 |
| Mo | 0.45–0.65 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Yield strength | ≥310 MPa (Class 2) |
| Tensile strength | 515–690 MPa (Class 2) |
| Density | 7.85 g/cm³ |
Heat treatment
Supplied normalized and tempered (Class 2). PWHT after welding is standard practice for 5Cr plate.
Equivalent grades
| Standard | Designation |
|---|---|
| aisi | A387 Gr.5 Cl.2 |
| jis | SCMV6 (near) |
Compare side by side: A387 Gr.5 vs A387 Gr.11 · A387 Gr.5 vs A387 Gr.22
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Hydrocracker and hydrotreater hot separators, high-temperature refinery vessels, hot hydrogen service within Nelson-curve limits, furnace tubes supports.
Processing: Weld with 5Cr-0.5Mo consumables, preheat 200–300 °C by thickness and PWHT; air-hardening chemistry means as-welded joints are never left un-tempered in code service.
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Ask for a quotationVisit NasteelSource: ASTM A387 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.