--- title: "SFVQ2B — Quenched and tempered steels" description: "SFVQ2B: 2 equivalent designations across 2 standards, with the recorded chemical composition shown next to the source text." canonical: https://steelequivalents.com/materials/jis/sfvq2b language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/jis/sfvq2b.md cs: https://steelequivalents.com/cs/materiály/jis/sfvq2b.md de: https://steelequivalents.com/de/werkstoffe/jis/sfvq2b.md es: https://steelequivalents.com/es/materiales/jis/sfvq2b.md fr: https://steelequivalents.com/fr/matériaux/jis/sfvq2b.md hu: https://steelequivalents.com/hu/anyagok/jis/sfvq2b.md it: https://steelequivalents.com/it/materiali/jis/sfvq2b.md nl: https://steelequivalents.com/nl/materialen/jis/sfvq2b.md pl: https://steelequivalents.com/pl/materiały/jis/sfvq2b.md pt: https://steelequivalents.com/pt/materiais/jis/sfvq2b.md ru: https://steelequivalents.com/ru/материалы/jis/sfvq2b.md tr: https://steelequivalents.com/tr/malzemeler/jis/sfvq2b.md zh: https://steelequivalents.com/zh/材料/jis/sfvq2b.md ja: https://steelequivalents.com/ja/材料/jis/sfvq2b.md ar: https://steelequivalents.com/ar/المواد/jis/sfvq2b.md ko: https://steelequivalents.com/ko/재료/jis/sfvq2b.md pt-br: https://steelequivalents.com/pt-br/materiais/jis/sfvq2b.md hi: https://steelequivalents.com/hi/सामग्री/jis/sfvq2b.md content_hash: sha256:09fa40554e440f4019561a90c64f485348348d4a02bdb380c11780e85b348aed 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/sfvq2b > Canonical URL: https://steelequivalents.com/materials/jis/sfvq2b > 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 # SFVQ2B SFVQ2B is a material in the category [Quenched and tempered steels](/categories/quenched-and-tempered-steels "Quenched and tempered steels"). Its recorded composition includes C ≤ 0.27%, Cr 0.25–0.45%, Mn 0.5–1%, Ni 0.5–1% and Mo 0.55–0.7%. We list one designation recorded for this grade, in the standard KS. Recorded mechanical properties include Rm 620–790 N/mm², Re 450 N/mm², A 14% and Z 35%; these figures vary with the delivery condition and dimension. - [*Category* **Quenched and tempered steels · 133 grades**](/categories/quenched-and-tempered-steels "Category: Quenched and tempered steels · 133 grades") - *Designations* **2** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=ab778a7e-2753-4a76-9f73-ae41909bbda2&designation=65d93bc8-b6e5-4ee2-932b-cf878aa2cedb "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/sfvq2b.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - **KS SFVQ2B This grade’s own name** ## About Quenched and tempered steels Quenched and tempered steels are heat-treated steels designed to combine high strength with useful toughness and ductility. They are used for heavily loaded components such as shafts, gears, fasteners and structural machine parts where resistance to mechanical stress is required. 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 - **SFVQ2B This grade’s own name** KS South Korea · 1 - **SFVQ2B 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 9 elements on file · weight % What this alloy is Fe Mn Ni Mo Iron — the balance, never listed by a standard — 96.7 % Mn — 0.8 % Ni — 0.8 % Mo — 0.6 % Traces & impurities · 1.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.27 | | Si | ≤ 0.4 | | Mn | 0.5–1 | | P | ≤ 0.03 | | S | ≤ 0.03 | | Cr | 0.25–0.45 | | Mo | 0.55–0.7 | | Ni | 0.5–1 | | V | ≤ 0.05 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Vanadium 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 0.27 | — | 0.270 | Max | | Si | max 0.4 | — | 0.400 | Max | | P | max 0.03 | — | 0.030 | Max | | S | max 0.03 | — | 0.030 | Max | | V | max 0.05 | — | 0.050 | Max | | Cr | 0.25 - 0.45 | 0.250 | 0.450 | Range | | Mn | 0.5 - 1 | 0.500 | 1.000 | Range | | Ni | 0.5 - 1 | 0.500 | 1.000 | Range | | Mo | 0.55 - 0.7 | 0.550 | 0.700 | 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 computed from composition · °C Predicted Ae3 791 °C Predicted Ae1 714 °C Predicted Acm 493 °C Predicted Bs 527 °C These four temperatures are a CALCULATION from this grade's own composition, using the published Li, Niebuhr, Meekisho & Atteridge (1998) model — never a measurement, and computed from the UPPER BOUND of each element's specified range, not a mid-range figure. Where this grade also has a measured transformation point (Ac1, Ac3, Ar1, Ar3) on file, it is shown separately, in Physical & mechanical properties, and is never replaced by the predicted figures here — Ae (predicted, equilibrium) and Ac/Ar (measured, on heating or cooling) are different physical quantities and can differ by tens of degrees; a mismatch between the two is not an error in either. ## 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=ab778a7e-2753-4a76-9f73-ae41909bbda2&designation=65d93bc8-b6e5-4ee2-932b-cf878aa2cedb "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/sfvq2b.pdf "Datasheet as PDF")