--- title: "STS11 — composition, equivalents and standards" description: "STS11: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/ks/sts11 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/ks/sts11.md cs: https://steelequivalents.com/cs/materiály/ks/sts11.md de: https://steelequivalents.com/de/werkstoffe/ks/sts11.md es: https://steelequivalents.com/es/materiales/ks/sts11.md fr: https://steelequivalents.com/fr/matériaux/ks/sts11.md hu: https://steelequivalents.com/hu/anyagok/ks/sts11.md it: https://steelequivalents.com/it/materiali/ks/sts11.md nl: https://steelequivalents.com/nl/materialen/ks/sts11.md pl: https://steelequivalents.com/pl/materiały/ks/sts11.md pt: https://steelequivalents.com/pt/materiais/ks/sts11.md ru: https://steelequivalents.com/ru/материалы/ks/sts11.md tr: https://steelequivalents.com/tr/malzemeler/ks/sts11.md zh: https://steelequivalents.com/zh/材料/ks/sts11.md ja: https://steelequivalents.com/ja/材料/ks/sts11.md ar: https://steelequivalents.com/ar/المواد/ks/sts11.md ko: https://steelequivalents.com/ko/재료/ks/sts11.md pt-br: https://steelequivalents.com/pt-br/materiais/ks/sts11.md hi: https://steelequivalents.com/hi/सामग्री/ks/sts11.md content_hash: sha256:2adae035ee8dbfd31386c41b2742778b6037b4844cbe928f71365bf844c14b0a generated: 2026-09-23 --- > **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/sts11 > Canonical URL: https://steelequivalents.com/materials/ks/sts11 > 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 # STS11 STS11 is a grade designated under KS. Its recorded composition includes C 1.2–1.3%, Si ≤ 0.35%, Cr 0.2–0.5%, Mn ≤ 0.5% and W 3–4%. No cross-standard equivalents are recorded for this grade yet. Recorded mechanical properties include HB 241. - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=e797c51b-66a0-4ee0-ae34-480144cda894&designation=a019b269-0387-490d-a0c1-85763fc453ec "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ks/sts11.pdf "Datasheet as PDF") ## Chemical composition 8 elements on file · weight % What this alloy is Fe W C Mn Iron — the balance, never listed by a standard — 93.8 % W — 3.5 % C — 1.3 % Mn — 0.5 % Traces & impurities · 1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 1.2–1.3 — Unusual | | Si | ≤ 0.35 | | Mn | ≤ 0.5 | | P | ≤ 0.03 | | S | ≤ 0.03 | | Cr | 0.2–0.5 | | V | 0.1–0.3 | | W | 3–4 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Vanadium Tungsten 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 | 1.2 - 1.3 | 1.200 | 1.300 | Range | | Si | max 0.35 | — | 0.350 | Max | | P | max 0.03 | — | 0.030 | Max | | S | max 0.03 | — | 0.030 | Max | | V | 0.1 - 0.3 | 0.100 | 0.300 | Range | | Cr | 0.2 - 0.5 | 0.200 | 0.500 | Range | | Mn | max 0.5 | — | 0.500 | Max | | W | 3 - 4 | 3.000 | 4.000 | 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 Not enough recorded composition to predict a transformation temperature for this grade — missing: Ni, 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. ## 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=e797c51b-66a0-4ee0-ae34-480144cda894&designation=a019b269-0387-490d-a0c1-85763fc453ec "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ks/sts11.pdf "Datasheet as PDF")