--- title: "SFT590 — High-strength steels" description: "SFT590: 1 equivalent designations across 1 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/jis/sft590 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/jis/sft590.md cs: https://steelequivalents.com/cs/materiály/jis/sft590.md de: https://steelequivalents.com/de/werkstoffe/jis/sft590.md es: https://steelequivalents.com/es/materiales/jis/sft590.md fr: https://steelequivalents.com/fr/matériaux/jis/sft590.md hu: https://steelequivalents.com/hu/anyagok/jis/sft590.md it: https://steelequivalents.com/it/materiali/jis/sft590.md nl: https://steelequivalents.com/nl/materialen/jis/sft590.md pl: https://steelequivalents.com/pl/materiały/jis/sft590.md pt: https://steelequivalents.com/pt/materiais/jis/sft590.md ru: https://steelequivalents.com/ru/материалы/jis/sft590.md tr: https://steelequivalents.com/tr/malzemeler/jis/sft590.md zh: https://steelequivalents.com/zh/材料/jis/sft590.md ja: https://steelequivalents.com/ja/材料/jis/sft590.md ar: https://steelequivalents.com/ar/المواد/jis/sft590.md ko: https://steelequivalents.com/ko/재료/jis/sft590.md pt-br: https://steelequivalents.com/pt-br/materiais/jis/sft590.md hi: https://steelequivalents.com/hi/सामग्री/jis/sft590.md content_hash: sha256:8538deba49093b626290d51fe2646d76fe7c950aa80dc638748490b0fbd7e06b 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/jis/sft590 > Canonical URL: https://steelequivalents.com/materials/jis/sft590 > 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 · 1 designation # SFT590 SFT590 is a material in the category [High-strength steels](/categories/high-strength-steels "High-strength steels"). Its recorded composition includes C ≤ 0.2%, Si ≤ 0.35%, P ≤ 0.03%, S ≤ 0.03% and Mn ≤ 1.5%. No cross-standard equivalents are recorded for this grade yet. Recorded mechanical properties include Rm 590–740 N/mm², Re 440 N/mm² and A 17%. - [*Category* **High-strength steels · 128 grades**](/categories/high-strength-steels "Category: High-strength steels · 128 grades") - *Designations* **1** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=8e233809-72f7-452c-b51c-fd1e495720ab&designation=18d4c486-576b-4ed5-9316-b6e27a994fcf "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/sft590.pdf "Datasheet as PDF") ## About High-strength steels High-strength steels are steels designed to carry high loads while resisting deformation. They are used for load-bearing structures, vehicles and machinery where strength, durability and reduced material weight are important. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Chemical composition 5 elements on file · weight % What this alloy is Fe Mn Si C Iron — the balance, never listed by a standard — 97.9 % Mn — 1.5 % Si — 0.4 % C — 0.2 % Traces & impurities · 0.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.2 | | Si | ≤ 0.35 | | Mn | ≤ 1.5 | | P | ≤ 0.03 | | S | ≤ 0.03 | Carbon Silicon Manganese Phosphorus Sulfur 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 0.2 | — | 0.200 | Max | | Si | max 0.35 | — | 0.350 | Max | | P | max 0.03 | — | 0.030 | Max | | S | max 0.03 | — | 0.030 | Max | | Mn | max 1.5 | — | 1.500 | Max | 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, Cr, 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=8e233809-72f7-452c-b51c-fd1e495720ab&designation=18d4c486-576b-4ed5-9316-b6e27a994fcf "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/sft590.pdf "Datasheet as PDF")