254 SMO
254 SMO is a high-alloy austenitic stainless steel developed for severe chloride service. Its high chromium, nickel, molybdenum and nitrogen contents provide strong resistance to pitting, crevice corrosion and stress-corrosion cracking. The requested 250SMO folder name is retained only for URL compatibility; the recognized grade designation is 254 SMO / UNS S31254.
254 SMO Information
254 SMO is a high-alloy austenitic stainless steel developed for severe chloride service. Its high chromium, nickel, molybdenum and nitrogen contents provide strong resistance to pitting, crevice corrosion and stress-corrosion cracking. The requested 250SMO folder name is retained only for URL compatibility; the recognized grade designation is 254 SMO / UNS S31254.
Metallic winding and compatible ring components where service conditions are suitable.
| Material specification | ASTM A240 |
|---|---|
| Specified grade / UNS | 254 SMO S31254 |
254 SMO Chemical Composition
ASTM A240 · Grade-specific requirements
| Element / requirement | Value |
|---|---|
| C % | ≤0.020 |
| Mn % | ≤1.00 |
| P % | ≤0.030 |
| S % | ≤0.010 |
| Si % | ≤0.80 |
| Cr % | 19.5–20.5 |
| Ni % | 17.5–18.5 |
| Mo % | 6.0–6.5 |
| N % | 0.18–0.25 |
| Cu % | 0.50–1.00 |
| Other elements | - |
254 SMO Mechanical Properties
ASTM A240 · Grade-specific requirements
| Tensile min (MPa) | Yield min (MPa) | Elongation min (%) | Hardness max |
|---|---|---|---|
| 690 | 310 | 35 | ≤223 HBW / ≤96 HRBW |
| 655 | 310 | 35 | ≤223 HBW / ≤96 HRBW |
ASTM A240 Grade Reference
254 SMO S31254
The chemical and mechanical tables on this page use the ASTM A240 requirements for this grade, including the product conditions listed in the standard overview.
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