434
Data verified434 adds about 1% molybdenum to the 430 base, improving pitting resistance and giving it the best corrosion performance of the straight-chromium ferritic grades below the stabilised super-ferritics. It is a traditional automotive trim grade.
Chemical composition
| Element | Content (%) |
|---|---|
| C | ≤0.12 |
| Si | ≤1.00 |
| Mn | ≤1.00 |
| P | ≤0.040 |
| S | ≤0.030 |
| Cr | 16.00–18.00 |
| Mo | 0.75–1.25 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Delivery condition | Annealed |
| Hardness | ≤183 HB (annealed) |
| Tensile strength | 450–630 MPa |
| Density | 7.70 g/cm³ |
| Magnetic | Yes |
Heat treatment
Anneal 790–870 °C, air cool.
Equivalent grades
| Standard | Designation |
|---|---|
| din | 1.4113 |
| aisi | 434 |
| jis | SUS434 |
| gb | 10Cr17Mo |
Compare side by side: 434 vs 430 · 434 vs 436
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Automotive bright trim and mouldings, dishwashers, acid-handling parts, decorative sheet.
Processing: Formability as 430; weldability limited like other unstabilised ferritics; takes a bright polish well.
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Ask for a quotationVisit NasteelSource: ASTM A240 / EN 10088 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.