--- title: "STSY310S — composition, equivalents and standards" description: "STSY310S: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/ks/stsy310s language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/ks/stsy310s.md cs: https://steelequivalents.com/cs/materiály/ks/stsy310s.md de: https://steelequivalents.com/de/werkstoffe/ks/stsy310s.md es: https://steelequivalents.com/es/materiales/ks/stsy310s.md fr: https://steelequivalents.com/fr/matériaux/ks/stsy310s.md hu: https://steelequivalents.com/hu/anyagok/ks/stsy310s.md it: https://steelequivalents.com/it/materiali/ks/stsy310s.md nl: https://steelequivalents.com/nl/materialen/ks/stsy310s.md pl: https://steelequivalents.com/pl/materiały/ks/stsy310s.md pt: https://steelequivalents.com/pt/materiais/ks/stsy310s.md ru: https://steelequivalents.com/ru/материалы/ks/stsy310s.md tr: https://steelequivalents.com/tr/malzemeler/ks/stsy310s.md zh: https://steelequivalents.com/zh/材料/ks/stsy310s.md ja: https://steelequivalents.com/ja/材料/ks/stsy310s.md ar: https://steelequivalents.com/ar/المواد/ks/stsy310s.md ko: https://steelequivalents.com/ko/재료/ks/stsy310s.md pt-br: https://steelequivalents.com/pt-br/materiais/ks/stsy310s.md hi: https://steelequivalents.com/hi/सामग्री/ks/stsy310s.md content_hash: sha256:2bf8468450ea7440426cf6a5301fde4ef26ddae78b1ce09690a08324e933ea43 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/stsy310s > Canonical URL: https://steelequivalents.com/materials/ks/stsy310s > 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 # STSY310S STSY310S is a grade designated under KS. Its recorded composition includes C ≤ 0.08%, Si ≤ 0.65%, Cr 25–28%, Mn 1–2.5% and Ni 20–22.5%. No cross-standard equivalents are recorded for this grade yet. - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=3a626e2c-8932-4f02-ae35-48c940ca5a37&designation=4ffe1e32-a0db-4b49-bedc-010bc29a8484 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ks/stsy310s.pdf "Datasheet as PDF") ## Chemical composition 7 elements on file · weight % What this alloy is Fe Cr Ni Mn Iron — the balance, never listed by a standard — 49.7 % Cr — 26.5 % Ni — 21.3 % Mn — 1.8 % Traces & impurities · 0.8 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.08 | | Si | ≤ 0.65 | | Mn | 1–2.5 | | P | ≤ 0.03 | | S | ≤ 0.03 | | Cr | 25–28 — Unusual | | Ni | 20–22.5 | Carbon Silicon Manganese Phosphorus Sulfur Chromium 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 | max 0.08 | — | 0.080 | Max | | Si | max 0.65 | — | 0.650 | Max | | P | max 0.03 | — | 0.030 | Max | | S | max 0.03 | — | 0.030 | Max | | Cr | 25 - 28 | 25.000 | 28.000 | Range | | Mn | 1 - 2.5 | 1.000 | 2.500 | Range | | Ni | 20 - 22.5 | 20.000 | 22.500 | 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: 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=3a626e2c-8932-4f02-ae35-48c940ca5a37&designation=4ffe1e32-a0db-4b49-bedc-010bc29a8484 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/ks/stsy310s.pdf "Datasheet as PDF")