--- title: "708A47 — Quenched and tempered steels" description: "708A47 in BS: material number 1.7228, also listed as 50CrMo4. Category: Quenched and tempered steels. Designations recorded for this grade: 29." canonical: https://steelequivalents.com/materials/bs/708a47 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/bs/708a47.md cs: https://steelequivalents.com/cs/materiály/bs/708a47.md de: https://steelequivalents.com/de/werkstoffe/bs/708a47.md es: https://steelequivalents.com/es/materiales/bs/708a47.md fr: https://steelequivalents.com/fr/matériaux/bs/708a47.md hu: https://steelequivalents.com/hu/anyagok/bs/708a47.md it: https://steelequivalents.com/it/materiali/bs/708a47.md nl: https://steelequivalents.com/nl/materialen/bs/708a47.md pl: https://steelequivalents.com/pl/materiały/bs/708a47.md pt: https://steelequivalents.com/pt/materiais/bs/708a47.md ru: https://steelequivalents.com/ru/материалы/bs/708a47.md tr: https://steelequivalents.com/tr/malzemeler/bs/708a47.md zh: https://steelequivalents.com/zh/材料/bs/708a47.md ja: https://steelequivalents.com/ja/材料/bs/708a47.md ar: https://steelequivalents.com/ar/المواد/bs/708a47.md ko: https://steelequivalents.com/ko/재료/bs/708a47.md pt-br: https://steelequivalents.com/pt-br/materiais/bs/708a47.md hi: https://steelequivalents.com/hi/सामग्री/bs/708a47.md content_hash: sha256:79ffb2963a963fa9bb8154ecaa40cb1b7bbcc577535253ac5b47f92c4fe57bae 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/bs/708a47 > Canonical URL: https://steelequivalents.com/materials/bs/708a47 > 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. BS · United Kingdom · 29 designations # 708A47 708A47 is a designation in BS for the material held under material number 1.7228, also listed as 50CrMo4. It is a material in the category Quenched and tempered steels. We list 29 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, ISO, JIS, GB, GOST, ČSN, PN, COPANT and SRPS. - [*Material no.* **1.7228**](/materials/material-no/1.7228 "Material no.: 1.7228") - [*Category* **Quenched and tempered steels · 133 grades**](/categories/quenched-and-tempered-steels "Category: Quenched and tempered steels · 133 grades") - *Designations* **29** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=6b0ddb99-ff38-49ce-bc33-2ec9b79a9ef1&designation=7a27a447-6e5b-46b5-a730-9eae91e1ef7a "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/708a47.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 50CrMo4 This grade’s own name](/materials/din-en/50crmo4 "DIN / EN 50CrMo4") - [UNS G41470 This grade’s own name](/materials/uns/g41470 "UNS G41470") - [AISI / SAE 4147 This grade’s own name](/materials/aisi-sae/4147 "AISI / SAE 4147") - [JIS SCM 445H This grade’s own name · 3 grades on that route](/materials/jis/scm445h "JIS SCM 445H") ## 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 29 designations · 13 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. DIN / EN Europe · 1 - [50CrMo4 This grade’s own name](/materials/din-en/50crmo4 "DIN / EN 50CrMo4") UNS United States · 6 - [G41470 This grade’s own name](/materials/uns/g41470 "UNS G41470") - [G41500 This grade’s own name](/materials/uns/g41500 "UNS G41500") - [G86500 This grade’s own name](/materials/uns/g86500 "UNS G86500") - [H41470 This grade’s own name](/materials/uns/h41470 "UNS H41470") - [H41500 This grade’s own name](/materials/uns/h41500 "UNS H41500") - [H86500 This grade’s own name](/materials/uns/h86500 "UNS H86500") AISI / SAE United States · 6 - [4147 This grade’s own name](/materials/aisi-sae/4147 "AISI / SAE 4147") - [4147H This grade’s own name](/materials/aisi-sae/4147h "AISI / SAE 4147H") - [4150 This grade’s own name](/materials/aisi-sae/4150 "AISI / SAE 4150") - [4150H This grade’s own name](/materials/aisi-sae/4150h "AISI / SAE 4150H") - [8650 This grade’s own name](/materials/aisi-sae/8650 "AISI / SAE 8650") - [8650H This grade’s own name](/materials/aisi-sae/8650h "AISI / SAE 8650H") BS United Kingdom · 3 - **708A47 Indicative** - [708M40 Indicative](/materials/bs/708m40 "BS 708M40") - [708M50 Indicative](/materials/bs/708m50 "BS 708M50") AFNOR France · 2 - [50CD4 Indicative](/materials/afnor/50cd4 "AFNOR 50CD4") - [50CrMo4 Indicative](/materials/din-en/50crmo4 "AFNOR 50CrMo4") ISO International · 1 - [50CrMo4 Indicative](/materials/din-en/50crmo4 "ISO 50CrMo4") JIS Japan · 2 - [SCM 445H This grade’s own name](/materials/jis/scm445h "JIS SCM 445H") - [SCM445 This grade’s own name](/materials/jis/scm445 "JIS SCM445") GB China · 1 - [50CrMo Indicative](/materials/gb/50crmo "GB 50CrMo") GOST Russia / CIS · 2 - [50ChM Indicative](/materials/gost/50chm "GOST 50ChM") - [50KhM Indicative](/materials/gost/50khm "GOST 50KhM") ČSN Czechia · 2 - [15 XXX M Indicative](/materials/csn/15-xxx-m "ČSN 15 XXX M") - [15 XXX NN Indicative](/materials/csn/15-xxx-nn "ČSN 15 XXX NN") PN Poland · 1 - [50H Indicative](/materials/pn/50h "PN 50H") COPANT Latin America · 1 - [8650 Indicative](/materials/aisi-sae/8650 "COPANT 8650") SRPS Serbia · 1 - [Č.4733 Indicative](/materials/srps/c-4733 "SRPS Č.4733") 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 Mn C Iron — the balance, never listed by a standard — 97.1 % Cr — 1.1 % Mn — 0.7 % C — 0.5 % Traces & impurities · 0.7 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.46–0.54 | | Si | ≤ 0.4 | | Mn | 0.5–0.8 | | P | 0.035 | | S | 0.035 | | Cr | 0.9–1.2 | | Mo | 0.15–0.3 | 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 | 0,46-0,54 | 0.460 | 0.540 | Range | | Si | ≤0,40 | — | 0.400 | Max | | P | 0,035 | 0.035 | 0.035 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | Cr | 0,90-1,20 | 0.900 | 1.200 | Range | | Mn | 0,50-0,80 | 0.500 | 0.800 | Range | | Mo | 0,15-0,30 | 0.150 | 0.300 | 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 Density 7,69 g/cm³ Exact 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. ## Properties by condition 2 conditions · 6 values By thickness**Quenched and tempered · round products** source `steelnumber` | Thickness mm | A% · Lo = 5,65 √So | |---|---| | ≤ 16 | 9 | | 16 – 40 | 10 | | 40 – 100 | 12 | | 100 – 160 | 13 | | 160 – 250 | 13 | By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 248 | Every figure holds only for the condition on its own row. Values are never merged across conditions or across sources, never averaged, and never interpolated between two rows. An em dash means no value on file — never zero. Figures are converted to the unit in the column header; the source’s own wording is kept and shown where the two differ. ## Heat treatment Supply condition - Quenching and Tempering d=25 Conditions the standard permits on delivery. No temperature or medium is published for these, so no order and no alternation is implied. Source: [www.caishuku.com](https://www.caishuku.com/detail/azhlNWIxNzk5Mg__ "Source: www.caishuku.com") ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 1.7, a shared category, and a published range for Cr / Mn that overlaps this grade’s. These are neighbours in composition space — they are not equivalents, and none is claimed to be interchangeable with this grade. [28Cr4 1.7030 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.10 - 28 designations](/materials/din-en/28cr4 "28Cr4")[1.7033 1.7033 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.10 - 56 designations](/materials/material-no/1.7033 "1.7033")[37Cr4 1.7034 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.10 - 104 designations](/materials/din-en/37cr4 "37Cr4")[1.7035 1.7035 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.10 - 67 designations](/materials/material-no/1.7035 "1.7035")[34CrS4 1.7037 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.10 - 13 designations](/materials/din-en/34crs4 "34CrS4")[37CrS4 1.7038 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.10 - 10 designations](/materials/din-en/37crs4 "37CrS4") ## 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=6b0ddb99-ff38-49ce-bc33-2ec9b79a9ef1&designation=7a27a447-6e5b-46b5-a730-9eae91e1ef7a "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/708a47.pdf "Datasheet as PDF")