--- title: "SWOSC-B — Spring steels" description: "SWOSC-B: 2 equivalent designations across 2 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/jis/swosc-b language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/jis/swosc-b.md cs: https://steelequivalents.com/cs/materiály/jis/swosc-b.md de: https://steelequivalents.com/de/werkstoffe/jis/swosc-b.md es: https://steelequivalents.com/es/materiales/jis/swosc-b.md fr: https://steelequivalents.com/fr/matériaux/jis/swosc-b.md hu: https://steelequivalents.com/hu/anyagok/jis/swosc-b.md it: https://steelequivalents.com/it/materiali/jis/swosc-b.md nl: https://steelequivalents.com/nl/materialen/jis/swosc-b.md pl: https://steelequivalents.com/pl/materiały/jis/swosc-b.md pt: https://steelequivalents.com/pt/materiais/jis/swosc-b.md ru: https://steelequivalents.com/ru/материалы/jis/swosc-b.md tr: https://steelequivalents.com/tr/malzemeler/jis/swosc-b.md zh: https://steelequivalents.com/zh/材料/jis/swosc-b.md ja: https://steelequivalents.com/ja/材料/jis/swosc-b.md ar: https://steelequivalents.com/ar/المواد/jis/swosc-b.md ko: https://steelequivalents.com/ko/재료/jis/swosc-b.md pt-br: https://steelequivalents.com/pt-br/materiais/jis/swosc-b.md hi: https://steelequivalents.com/hi/सामग्री/jis/swosc-b.md content_hash: sha256:fa12840793a08e29f495346561db1345ae615650b626e834179ceb5bae9ece66 generated: 2026-09-22 --- > **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/jis/swosc-b > Canonical URL: https://steelequivalents.com/materials/jis/swosc-b > 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. JIS · Japan · 2 designations # SWOSC-B SWOSC-B is a material in the category [Spring steels](/categories/spring-steels "Spring steels"). Its recorded composition includes C 0.51–0.59%, Si 1.2–1.6%, P ≤ 0.035%, Cr 0.55–0.9% and Mn 0.5–0.9%. We list one designation recorded for this grade, in the standard KS. Recorded mechanical properties include Rm 1610–2110 N/mm²; these figures vary with the delivery condition and dimension. - [*Category* **Spring steels · 52 grades**](/categories/spring-steels "Category: Spring steels · 52 grades") - *Designations* **2** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=214eab0a-b8f4-41e2-a6b7-c92dbec62adb&designation=1562fed6-5dce-437d-85c2-e1eec79600b9 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/swosc-b.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - **KS SWOSC-B This grade’s own name** ## About Spring steels Spring steels are alloy steels designed to store and release elastic energy repeatedly without permanent deformation. They are characterised by a combination of strength, hardness and resilience, making them suitable for springs, clips, washers and other components subjected to repeated flexing or shock. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 2 designations · 2 standards · nothing hidden This grade’s own name recorded in our sources as this grade’s own designation under that standard. Indicative taken from a published cross-reference table; a close match, not a guarantee of interchangeability. Verify against the mill certificate before ordering. Withdrawn designation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once. JIS Japan · 1 - **SWOSC-B This grade’s own name** KS South Korea · 1 - **SWOSC-B This grade’s own name** Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 6 elements on file · weight % What this alloy is Fe Si Cr Mn Iron — the balance, never listed by a standard — 96.6 % Si — 1.4 % Cr — 0.7 % Mn — 0.7 % Traces & impurities · 0.6 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.51–0.59 | | Si | 1.2–1.6 | | Mn | 0.5–0.9 | | P | ≤ 0.035 | | S | ≤ 0.035 | | Cr | 0.55–0.9 | Carbon Silicon Manganese Phosphorus Sulfur Chromium 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 | 0.51 - 0.59 | 0.510 | 0.590 | Range | | Si | 1.2 - 1.6 | 1.200 | 1.600 | Range | | P | max 0.035 | — | 0.035 | Max | | S | max 0.035 | — | 0.035 | Max | | Cr | 0.55 - 0.9 | 0.550 | 0.900 | Range | | Mn | 0.5 - 0.9 | 0.500 | 0.900 | 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=214eab0a-b8f4-41e2-a6b7-c92dbec62adb&designation=1562fed6-5dce-437d-85c2-e1eec79600b9 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/swosc-b.pdf "Datasheet as PDF")