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Overview
Specifications
ASTM A194 Grade 3
The ASTM A194 specification covers carbon, alloy, and martensitic stainless steel nuts for high-pressure or high-temperature service. Grade 3 specifically identifies nuts made from 501 stainless steel.
| Chemical Requirements | Range (%) |
|---|---|
| Carbon (C) | 0.10 min |
| Manganese (Mn) | 1.00 max |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.030 max |
| Silicon (Si) | 1.00 max |
| Chromium (Cr) | 4.00 – 6.00 |
| Molybdenum (Mo) | 0.40 – 0.65 |
| Mechanical Properties | Requirement |
|---|---|
| Hardness, max (HB) | 248 |
| Proof Load (Heavy Hex, ksi) | 150 |