--- title: "SFL2 — Low-temperature structural steels" description: "SFL2: 2 equivalent designations across 2 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/jis/sfl2 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/jis/sfl2.md cs: https://steelequivalents.com/cs/materiály/jis/sfl2.md de: https://steelequivalents.com/de/werkstoffe/jis/sfl2.md es: https://steelequivalents.com/es/materiales/jis/sfl2.md fr: https://steelequivalents.com/fr/matériaux/jis/sfl2.md hu: https://steelequivalents.com/hu/anyagok/jis/sfl2.md it: https://steelequivalents.com/it/materiali/jis/sfl2.md nl: https://steelequivalents.com/nl/materialen/jis/sfl2.md pl: https://steelequivalents.com/pl/materiały/jis/sfl2.md pt: https://steelequivalents.com/pt/materiais/jis/sfl2.md ru: https://steelequivalents.com/ru/материалы/jis/sfl2.md tr: https://steelequivalents.com/tr/malzemeler/jis/sfl2.md zh: https://steelequivalents.com/zh/材料/jis/sfl2.md ja: https://steelequivalents.com/ja/材料/jis/sfl2.md ar: https://steelequivalents.com/ar/المواد/jis/sfl2.md ko: https://steelequivalents.com/ko/재료/jis/sfl2.md pt-br: https://steelequivalents.com/pt-br/materiais/jis/sfl2.md hi: https://steelequivalents.com/hi/सामग्री/jis/sfl2.md content_hash: sha256:6edbccc73c13bbc59807e996640b23978cf3a8e7e27b87df821a9d647c59cadd generated: 2026-09-21 --- > **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/sfl2 > Canonical URL: https://steelequivalents.com/materials/jis/sfl2 > 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 # SFL2 SFL2 is a material in the category [Low-temperature structural steels](/categories/low-temperature-structural-steels "Low-temperature structural steels"). Its recorded composition includes C ≤ 0.3%, Si ≤ 0.35%, P ≤ 0.03%, S ≤ 0.03% and Mn ≤ 1.35%. We list one designation recorded for this grade, in the standard KS. Recorded mechanical properties include Rm 490–640 N/mm², Re 245 N/mm², A 19% and Z 30%; these figures vary with the delivery condition and dimension. - [*Category* **Low-temperature structural steels · 55 grades**](/categories/low-temperature-structural-steels "Category: Low-temperature structural steels · 55 grades") - *Designations* **2** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=3450f670-3a7b-40f9-bf74-04d65e5155d3&designation=8ebf03db-6b3f-447d-adeb-368d7fadd235 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/sfl2.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - **KS SFL2 This grade’s own name** ## About Low-temperature structural steels Low-temperature structural steels are structural steels designed to retain toughness and reliable load-bearing performance in cold service. Their resistance to brittle fracture at low temperatures makes them suitable for structures, pressure-containing equipment and other components exposed to severe cold. 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 - **SFL2 This grade’s own name** KS South Korea · 1 - **SFL2 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 5 elements on file · weight % What this alloy is Fe Mn Si C Iron — the balance, never listed by a standard — 97.9 % Mn — 1.4 % Si — 0.4 % C — 0.3 % Traces & impurities · 0.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.3 | | Si | ≤ 0.35 | | Mn | ≤ 1.35 | | 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 0.3 | — | 0.300 | Max | | Si | max 0.35 | — | 0.350 | Max | | P | max 0.03 | — | 0.030 | Max | | S | max 0.03 | — | 0.030 | Max | | Mn | max 1.35 | — | 1.350 | 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=3450f670-3a7b-40f9-bf74-04d65e5155d3&designation=8ebf03db-6b3f-447d-adeb-368d7fadd235 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/sfl2.pdf "Datasheet as PDF")