--- title: "STF6 — composition, equivalents and standards" description: "STF6: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/ks/stf6 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/ks/stf6.md cs: https://steelequivalents.com/cs/materiály/ks/stf6.md de: https://steelequivalents.com/de/werkstoffe/ks/stf6.md es: https://steelequivalents.com/es/materiales/ks/stf6.md fr: https://steelequivalents.com/fr/matériaux/ks/stf6.md hu: https://steelequivalents.com/hu/anyagok/ks/stf6.md it: https://steelequivalents.com/it/materiali/ks/stf6.md nl: https://steelequivalents.com/nl/materialen/ks/stf6.md pl: https://steelequivalents.com/pl/materiały/ks/stf6.md pt: https://steelequivalents.com/pt/materiais/ks/stf6.md ru: https://steelequivalents.com/ru/материалы/ks/stf6.md tr: https://steelequivalents.com/tr/malzemeler/ks/stf6.md zh: https://steelequivalents.com/zh/材料/ks/stf6.md ja: https://steelequivalents.com/ja/材料/ks/stf6.md ar: https://steelequivalents.com/ar/المواد/ks/stf6.md ko: https://steelequivalents.com/ko/재료/ks/stf6.md pt-br: https://steelequivalents.com/pt-br/materiais/ks/stf6.md hi: https://steelequivalents.com/hi/सामग्री/ks/stf6.md content_hash: sha256:df944670f683b4ae71379bdcb314a5455735c5e7daa43c9f8f024ace1187ab2f 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/stf6 > Canonical URL: https://steelequivalents.com/materials/ks/stf6 > 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 # STF6 STF6 is a grade designated under KS. Its recorded composition includes C 0.4–0.5%, Si 0.1–0.4%, Cr 1.2–1.5%, Mn 0.6–0.9% and Ni 3.8–4.3%. No cross-standard equivalents are recorded for this grade yet. Recorded mechanical properties include HB 285. - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=9d2c3b2d-9ba4-4794-a39b-0b102cadc990&designation=27d26fb3-ad0a-4b1e-a247-ef1d7b9231b5 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ks/stf6.pdf "Datasheet as PDF") ## Chemical composition 8 elements on file · weight % What this alloy is Fe Ni Cr Mn Iron — the balance, never listed by a standard — 92.9 % Ni — 4.1 % Cr — 1.4 % Mn — 0.8 % Traces & impurities · 1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.4–0.5 | | Si | 0.1–0.4 | | Mn | 0.6–0.9 | | P | ≤ 0.03 | | S | ≤ 0.02 | | Cr | 1.2–1.5 | | Mo | 0.15–0.35 | | Ni | 3.8–4.3 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel 0.01 % 0.1 % 1 % 10 % 100 % The scale is logarithmic, not the element’s raw share of the alloy — the only honest way to fit 0.01 % and 100 % in one picture, and it means every value here can be compared with every other. | Element | As published source text, verbatim | Min% by weight | Max% by weight | Bound | |---|---|---|---|---| | C | 0.4 - 0.5 | 0.400 | 0.500 | Range | | Si | 0.1 - 0.4 | 0.100 | 0.400 | Range | | P | max 0.03 | — | 0.030 | Max | | S | max 0.02 | — | 0.020 | Max | | Cr | 1.2 - 1.5 | 1.200 | 1.500 | Range | | Mn | 0.6 - 0.9 | 0.600 | 0.900 | Range | | Ni | 3.8 - 4.3 | 3.800 | 4.300 | Range | | Mo | 0.15 - 0.35 | 0.150 | 0.350 | Range | The published column is the source string byte-for-byte, decimal comma and all; Min and Max are the parsed bounds. Elements not listed have no value on file — they are omitted, never inferred. ## Predicted transformation temperatures This grade's composition falls outside the published model's validated range (a low-alloy composition window), so no transformation temperature is predicted here. ## 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. ## 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=9d2c3b2d-9ba4-4794-a39b-0b102cadc990&designation=27d26fb3-ad0a-4b1e-a247-ef1d7b9231b5 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ks/stf6.pdf "Datasheet as PDF")