--- title: "STD8 — composition, equivalents and standards" description: "STD8: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/ks/std8 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/ks/std8.md cs: https://steelequivalents.com/cs/materiály/ks/std8.md de: https://steelequivalents.com/de/werkstoffe/ks/std8.md es: https://steelequivalents.com/es/materiales/ks/std8.md fr: https://steelequivalents.com/fr/matériaux/ks/std8.md hu: https://steelequivalents.com/hu/anyagok/ks/std8.md it: https://steelequivalents.com/it/materiali/ks/std8.md nl: https://steelequivalents.com/nl/materialen/ks/std8.md pl: https://steelequivalents.com/pl/materiały/ks/std8.md pt: https://steelequivalents.com/pt/materiais/ks/std8.md ru: https://steelequivalents.com/ru/материалы/ks/std8.md tr: https://steelequivalents.com/tr/malzemeler/ks/std8.md zh: https://steelequivalents.com/zh/材料/ks/std8.md ja: https://steelequivalents.com/ja/材料/ks/std8.md ar: https://steelequivalents.com/ar/المواد/ks/std8.md ko: https://steelequivalents.com/ko/재료/ks/std8.md pt-br: https://steelequivalents.com/pt-br/materiais/ks/std8.md hi: https://steelequivalents.com/hi/सामग्री/ks/std8.md content_hash: sha256:2217eb6c1ba2dc13e5cbfd6847ded10a6e789ad4763d5d51d4a03a4b0ac931ed 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/std8 > Canonical URL: https://steelequivalents.com/materials/ks/std8 > 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 # STD8 STD8 is a grade designated under KS. Its recorded composition includes C 0.35–0.45%, V 1.7–2.1%, Cr 4–4.7%, Co 4–4.5% and W 3.8–4.5%. No cross-standard equivalents are recorded for this grade yet. Recorded mechanical properties include HB 262. - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=0b8eb66c-40c6-4c3f-8518-c68956e833d3&designation=23fb45ed-b73b-46a0-b7b9-322ba9cbc7d4 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ks/std8.pdf "Datasheet as PDF") ## Chemical composition 10 elements on file · weight % What this alloy is Fe Cr Co W Iron — the balance, never listed by a standard — 83.8 % Cr — 4.4 % Co — 4.3 % W — 4.2 % Traces & impurities · 3.4 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.35–0.45 | | Si | 0.15–0.5 | | Mn | 0.2–0.5 | | P | ≤ 0.03 | | S | ≤ 0.02 | | Cr | 4–4.7 | | Mo | 0.3–0.5 | | V | 1.7–2.1 | | W | 3.8–4.5 | | Co | 4–4.5 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Vanadium Tungsten Cobalt 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 | 0.35 - 0.45 | 0.350 | 0.450 | Range | | Si | 0.15 - 0.5 | 0.150 | 0.500 | Range | | P | max 0.03 | — | 0.030 | Max | | S | max 0.02 | — | 0.020 | Max | | V | 1.7 - 2.1 | 1.700 | 2.100 | Range | | Cr | 4 - 4.7 | 4.000 | 4.700 | Range | | Mn | 0.2 - 0.5 | 0.200 | 0.500 | Range | | Co | 4 - 4.5 | 4.000 | 4.500 | Range | | Mo | 0.3 - 0.5 | 0.300 | 0.500 | Range | | W | 3.8 - 4.5 | 3.800 | 4.500 | 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. ## 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=0b8eb66c-40c6-4c3f-8518-c68956e833d3&designation=23fb45ed-b73b-46a0-b7b9-322ba9cbc7d4 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ks/std8.pdf "Datasheet as PDF")