--- title: "SFVAF21A — composition, equivalents and standards" description: "SFVAF21A: 2 equivalent designations across 2 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/jis/sfvaf21a language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/jis/sfvaf21a.md cs: https://steelequivalents.com/cs/materiály/jis/sfvaf21a.md de: https://steelequivalents.com/de/werkstoffe/jis/sfvaf21a.md es: https://steelequivalents.com/es/materiales/jis/sfvaf21a.md fr: https://steelequivalents.com/fr/matériaux/jis/sfvaf21a.md hu: https://steelequivalents.com/hu/anyagok/jis/sfvaf21a.md it: https://steelequivalents.com/it/materiali/jis/sfvaf21a.md nl: https://steelequivalents.com/nl/materialen/jis/sfvaf21a.md pl: https://steelequivalents.com/pl/materiały/jis/sfvaf21a.md pt: https://steelequivalents.com/pt/materiais/jis/sfvaf21a.md ru: https://steelequivalents.com/ru/материалы/jis/sfvaf21a.md tr: https://steelequivalents.com/tr/malzemeler/jis/sfvaf21a.md zh: https://steelequivalents.com/zh/材料/jis/sfvaf21a.md ja: https://steelequivalents.com/ja/材料/jis/sfvaf21a.md ar: https://steelequivalents.com/ar/المواد/jis/sfvaf21a.md ko: https://steelequivalents.com/ko/재료/jis/sfvaf21a.md pt-br: https://steelequivalents.com/pt-br/materiais/jis/sfvaf21a.md hi: https://steelequivalents.com/hi/सामग्री/jis/sfvaf21a.md content_hash: sha256:3f15781f02847182aeb8fc2cca89c6d1b6e135338c6a8cc337774db7f541b3b9 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/sfvaf21a > Canonical URL: https://steelequivalents.com/materials/jis/sfvaf21a > 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 # SFVAF21A SFVAF21A is a grade designated under JIS. Its recorded composition includes C ≤ 0.15%, Si ≤ 0.5%, Cr 2.65–3.35%, Mn 0.3–0.6% and Mo 0.8–1%. We list one designation recorded for this grade, in the standard KS. Recorded mechanical properties include Rm 410–590 N/mm², Re 205 N/mm², A 18% and Z 40%; these figures vary with the delivery condition and dimension. - *Designations* **2** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=0f349ffa-2364-449e-941e-e1c767bae6a2&designation=8c21906a-bada-4bac-b56d-d6d1af39e10d "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/sfvaf21a.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - **KS SFVAF21A This grade’s own name** ## 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 - **SFVAF21A This grade’s own name** KS South Korea · 1 - **SFVAF21A 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 7 elements on file · weight % What this alloy is Fe Cr Mo Si Iron — the balance, never listed by a standard — 94.9 % Cr — 3 % Mo — 0.9 % Si — 0.5 % Traces & impurities · 0.7 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.15 | | Si | ≤ 0.5 | | Mn | 0.3–0.6 | | P | ≤ 0.03 | | S | ≤ 0.03 | | Cr | 2.65–3.35 | | Mo | 0.8–1 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum 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 0.15 | — | 0.150 | Max | | Si | max 0.5 | — | 0.500 | Max | | P | max 0.03 | — | 0.030 | Max | | S | max 0.03 | — | 0.030 | Max | | Cr | 2.65 - 3.35 | 2.650 | 3.350 | Range | | Mn | 0.3 - 0.6 | 0.300 | 0.600 | Range | | Mo | 0.8 - 1 | 0.800 | 1.000 | 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=0f349ffa-2364-449e-941e-e1c767bae6a2&designation=8c21906a-bada-4bac-b56d-d6d1af39e10d "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/sfvaf21a.pdf "Datasheet as PDF")