--- title: "STR409L — Heat resistant steels" description: "STR409L: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/ks/str409l language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/ks/str409l.md cs: https://steelequivalents.com/cs/materiály/ks/str409l.md de: https://steelequivalents.com/de/werkstoffe/ks/str409l.md es: https://steelequivalents.com/es/materiales/ks/str409l.md fr: https://steelequivalents.com/fr/matériaux/ks/str409l.md hu: https://steelequivalents.com/hu/anyagok/ks/str409l.md it: https://steelequivalents.com/it/materiali/ks/str409l.md nl: https://steelequivalents.com/nl/materialen/ks/str409l.md pl: https://steelequivalents.com/pl/materiały/ks/str409l.md pt: https://steelequivalents.com/pt/materiais/ks/str409l.md ru: https://steelequivalents.com/ru/материалы/ks/str409l.md tr: https://steelequivalents.com/tr/malzemeler/ks/str409l.md zh: https://steelequivalents.com/zh/材料/ks/str409l.md ja: https://steelequivalents.com/ja/材料/ks/str409l.md ar: https://steelequivalents.com/ar/المواد/ks/str409l.md ko: https://steelequivalents.com/ko/재료/ks/str409l.md pt-br: https://steelequivalents.com/pt-br/materiais/ks/str409l.md hi: https://steelequivalents.com/hi/सामग्री/ks/str409l.md content_hash: sha256:080c4869fa21f99fb6e300eb0d63e2e6d9909ffc390881672f9fde14852c7af6 generated: 2026-09-24 --- > **Machine-readable Markdown rendering.** This is a Markdown representation of a web page, > served for AI agents and crawlers as a token-efficient alternative to the full HTML. > Full interactive HTML version: https://steelequivalents.com/materials/ks/str409l > Canonical URL: https://steelequivalents.com/materials/ks/str409l > Available languages: en, cs, de, es, fr, hu, it, nl, pl, pt, ru, tr, zh, ja, ar, ko, pt-br, hi > Change detection: `content_hash` is the SHA-256 of this document's Markdown body — everything > below this block, whitespace-trimmed, excluding the front-matter. Compare it to detect a real > content change; `generated` moves on every render and is not a change signal. KS · South Korea · 1 designation # STR409L STR409L is a material in the category [Heat resistant steels](/categories/heat-resistant-steels "Heat resistant steels"). Recorded mechanical properties include Rm 360 N/mm², Re 175 N/mm², A 25% and HB 162. We hold no composition or cross-standard equivalents for it yet. - [*Category* **Heat resistant steels · 64 grades**](/categories/heat-resistant-steels "Category: Heat resistant steels · 64 grades") - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=bebfddb2-4ac5-4033-b6ae-e924fce7cd83&designation=f2e6e621-f9f6-4ae0-a191-e2010ce6bb85 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ks/str409l.pdf "Datasheet as PDF") ## About Heat resistant steels Heat resistant steels are alloyed materials designed to retain useful mechanical properties and resist oxidation or scaling during service at elevated temperatures. They are used for components in furnaces, boilers, heat exchangers and power-generation equipment exposed to hot gases or sustained heat. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Predicted transformation temperatures Not enough recorded composition to predict a transformation temperature for this grade — missing: C, Mn, Si, Ni, Cr, Mo. ## Physical & mechanical properties An absent property means we hold no value for it — it is left out rather than estimated, interpolated from a neighbouring grade, or filled from a handbook. It does not mean the property is undefined for the material. ## Properties by condition 1 conditions · 3 values By delivery state**no delivery state stated** source `steelks` | Delivery state | Rm N/mm² | Re N/mm² | A% | |---|---|---|---| | Plate/Sheet | 360 | 175 | 25 | Every figure holds only for the condition on its own row. Values are never merged across conditions or across sources, never averaged, and never interpolated between two rows. An em dash means no value on file — never zero. Figures are converted to the unit in the column header; the source’s own wording is kept and shown where the two differ. ## Looking for this grade under another name? Search the catalogue by designation, material number or composition — every name on this page is itself a way in. [Search](/search "Steel grade search")[Inquiry](/inquiry?material=bebfddb2-4ac5-4033-b6ae-e924fce7cd83&designation=f2e6e621-f9f6-4ae0-a191-e2010ce6bb85 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ks/str409l.pdf "Datasheet as PDF")