--- title: "525A58 — Spring steels" description: "525A58 in BS: material number 1.7176, also listed as 55Cr3. It is a material in the category Spring steels. Designations recorded for this grade: 47." canonical: https://steelequivalents.com/materials/bs/525a58 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/bs/525a58.md cs: https://steelequivalents.com/cs/materiály/bs/525a58.md de: https://steelequivalents.com/de/werkstoffe/bs/525a58.md es: https://steelequivalents.com/es/materiales/bs/525a58.md fr: https://steelequivalents.com/fr/matériaux/bs/525a58.md hu: https://steelequivalents.com/hu/anyagok/bs/525a58.md it: https://steelequivalents.com/it/materiali/bs/525a58.md nl: https://steelequivalents.com/nl/materialen/bs/525a58.md pl: https://steelequivalents.com/pl/materiały/bs/525a58.md pt: https://steelequivalents.com/pt/materiais/bs/525a58.md ru: https://steelequivalents.com/ru/материалы/bs/525a58.md tr: https://steelequivalents.com/tr/malzemeler/bs/525a58.md zh: https://steelequivalents.com/zh/材料/bs/525a58.md ja: https://steelequivalents.com/ja/材料/bs/525a58.md ar: https://steelequivalents.com/ar/المواد/bs/525a58.md ko: https://steelequivalents.com/ko/재료/bs/525a58.md pt-br: https://steelequivalents.com/pt-br/materiais/bs/525a58.md hi: https://steelequivalents.com/hi/सामग्री/bs/525a58.md content_hash: sha256:2cdfee0334580aae95a3d3f25aa5d46875a9820910cc96e634ad60ee4d08fbe2 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/525a58 > Canonical URL: https://steelequivalents.com/materials/bs/525a58 > 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 · 47 designations # 525A58 525A58 is a designation in BS for the material held under material number 1.7176, also listed as 55Cr3. It is a material in the category Spring steels. We list 47 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, JIS, GB, GOST, UNI, SS, ČSN, PN, COPANT, SRPS, AS / NZS, BDS, NBN and KS. - [*Material no.* **1.7176**](/materials/material-no/1.7176 "Material no.: 1.7176") - [*Category* **Spring steels · 52 grades**](/categories/spring-steels "Category: Spring steels · 52 grades") - *Designations* **47** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=9c8a3914-4a21-4926-a9f3-220c60d39a37&designation=990605ff-21d7-405d-ae92-e756037eccc4 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/525a58.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 55Cr3 This grade’s own name](/materials/din-en/55cr3 "DIN / EN 55Cr3") - [UNS G51600 This grade’s own name](/materials/uns/g51600 "UNS G51600") - [AISI / SAE 5155 This grade’s own name](/materials/aisi-sae/5155 "AISI / SAE 5155") ## About Spring steels Spring steels are alloy steels designed to store and release elastic energy repeatedly without permanent deformation. They are characterised by a combination of strength, hardness and resilience, making them suitable for springs, clips, washers and other components subjected to repeated flexing or shock. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 47 designations · 19 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 · 2 - [1.7176 Indicative](/materials/material-no/1.7176 "DIN / EN 1.7176") - [55Cr3 This grade’s own name](/materials/din-en/55cr3 "DIN / EN 55Cr3") UNS United States · 4 - [G51500 Indicative](/materials/uns/g51500 "UNS G51500") - [G51600 This grade’s own name](/materials/uns/g51600 "UNS G51600") - [H51550 This grade’s own name](/materials/uns/h51550 "UNS H51550") - [H51600 This grade’s own name](/materials/uns/h51600 "UNS H51600") AISI / SAE United States · 10 - [5147 Indicative](/materials/aisi-sae/5147 "AISI / SAE 5147") - [5147H Indicative](/materials/aisi-sae/5147h "AISI / SAE 5147H") - [5150 Indicative](/materials/aisi-sae/5150 "AISI / SAE 5150") - [5150H Indicative](/materials/aisi-sae/5150h "AISI / SAE 5150H") - [5155 This grade’s own name](/materials/aisi-sae/5155 "AISI / SAE 5155") - [5155H This grade’s own name](/materials/aisi-sae/5155h "AISI / SAE 5155H") - [5160 This grade’s own name](/materials/aisi-sae/5160 "AISI / SAE 5160") - [5160H This grade’s own name](/materials/aisi-sae/5160h "AISI / SAE 5160H") - [G51470 Indicative](/materials/aisi-sae/g51470 "AISI / SAE G51470") - [G51500 Indicative](/materials/uns/g51500 "AISI / SAE G51500") BS United Kingdom · 6 - [525A Indicative](/materials/bs/525a "BS 525A") - **525A58 Indicative** - [525A61 Indicative](/materials/bs/525a61 "BS 525A61") - [525H60 Indicative](/materials/bs/525h60 "BS 525H60") - [527A60 Indicative](/materials/bs/527a60 "BS 527A60") - [EN 48 Indicative](/materials/bs/en-48 "BS EN 48") AFNOR France · 2 - [45C4 Indicative](/materials/afnor/45c4 "AFNOR 45C4") - [55C3 Indicative](/materials/afnor/55c3 "AFNOR 55C3") UNE Spain · 2 - [55Cr3 Indicative](/materials/din-en/55cr3 "UNE 55Cr3") - [F.1431 Indicative](/materials/une/f-1431 "UNE F.1431") JIS Japan · 2 - [SUP9 Indicative](/materials/jis/sup9 "JIS SUP9") - [SUP9A Indicative](/materials/jis/sup9a "JIS SUP9A") GB China · 2 - [20CrMn Indicative](/materials/gb/20crmn "GB 20CrMn") - [55CrMnA Indicative](/materials/gb/55crmna "GB 55CrMnA") GOST Russia / CIS · 3 - [50KHG Indicative](/materials/gost/50khg "GOST 50KHG") - [50KHGA Indicative](/materials/gost/50khga "GOST 50KHGA") - [50ХГ Indicative](/materials/gost/50khg "GOST 50ХГ") UNI Italy · 1 - [55Cr3 Indicative](/materials/din-en/55cr3 "UNI 55Cr3") SS Sweden · 1 - [2253 Indicative](/materials/ss/2253 "SS 2253") ČSN Czechia · 2 - [14160 Indicative](/materials/csn/14160 "ČSN 14160") - [14262 Indicative](/materials/csn/14262 "ČSN 14262") PN Poland · 1 - [50HG Indicative](/materials/pn/50hg "PN 50HG") COPANT Latin America · 1 - [5160 Indicative](/materials/aisi-sae/5160 "COPANT 5160") SRPS Serbia · 1 - [Č.4332 Indicative](/materials/srps/c-4332 "SRPS Č.4332") AS / NZS Australia / New Zealand · 2 - [5155 Indicative](/materials/aisi-sae/5155 "AS / NZS 5155") - [XK5155S Indicative](/materials/as-nzs/xk5155s "AS / NZS XK5155S") BDS Bulgaria · 2 - [50ChG Indicative](/materials/bds/50chg "BDS 50ChG") - [50ChGA Indicative](/materials/bds/50chga "BDS 50ChGA") NBN Belgium · 1 - [55Cr3 Indicative](/materials/din-en/55cr3 "NBN 55Cr3") KS South Korea · 2 - [SPS5 Indicative](/materials/ks/sps5 "KS SPS5") - [SPS5A Indicative](/materials/ks/sps5a "KS SPS5A") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 6 elements on file · weight % What this alloy is Fe Mn Cr C Iron — the balance, never listed by a standard — 97.3 % Mn — 0.9 % Cr — 0.9 % C — 0.6 % Traces & impurities · 0.4 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.52–0.59 | | Si | ≤ 0.4 | | Mn | 0.7–1 | | P | 0.025 | | S | 0.025 | | Cr | 0.7–1 | Carbon Silicon Manganese Phosphorus Sulfur Chromium 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 | 0,52-0,59 | 0.520 | 0.590 | Range | | Si | ≤0,40 | — | 0.400 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,025 | 0.025 | 0.025 | Exact | | Cr | 0,70-1,00 | 0.700 | 1.000 | Range | | Mn | 0,70-1,00 | 0.700 | 1.000 | Range | - Cu+10Sn±0,60 - Cu+10Sn±0,60 - Cu+10Sn±0,60 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, Mo. ## Physical & mechanical properties Density 7,45 g/cm³ Exact Transformation point Ac1 750 °C Exact Transformation point Ac3 775 °C Exact · Ac3(Acm) Weldability not suitable for welding As published: is not used. Flake sensitivity not susceptible As published: not predisposed Temper brittleness not susceptible As published: not predisposed 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 5 conditions · 9 values By delivery state**no delivery state stated** source `splav` | Delivery state | HB | |---|---| | (annealing) , GOST 14959-79 | 269 | | (without heat treatment) , GOST 14959 | 302 | By delivery state**Treated to improve shearability** source `steelnumber` | Delivery state | HB | |---|---| | Treated to improve shearability | 280 | By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | Re N/mm² | A5% | Z% | |---|---|---|---|---| | Rolled stock, GOST 14959-79 | 1270 | 1175 | 7 | 35 | By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 248 | By delivery state**Annealed to achieve spheroidization of the carbides** source `steelnumber` | Delivery state | HB | |---|---| | Annealed to achieve spheroidization of the carbides | 230 | 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. ## 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. [58CrMnB4 1.7190 Cr 0,9 · Mn 1 - ΔCr 0.05 - ΔMn 0.15 - 12 designations](/materials/din-en/58crmnb4 "58CrMnB4")[52CrMoV4 1.7701 Cr 0,90-1,20 · Mn 0,70-1,10 - ΔCr 0.20 - ΔMn 0.05 - 5 designations](/materials/din-en/52crmov4 "52CrMoV4")[55SiCr6-3 1.7104 Cr 0,50-0,80 · Mn 0,50-0,90 - ΔCr 0.20 - ΔMn 0.15 - 4 designations](/materials/din-en/55sicr6-3 "55SiCr6-3")[54SiCr6 1.7102 Cr 0,50-0,80 · Mn 0,50-0,80 - ΔCr 0.20 - ΔMn 0.20 - 32 designations](/materials/din-en/54sicr6 "54SiCr6") ## 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=9c8a3914-4a21-4926-a9f3-220c60d39a37&designation=990605ff-21d7-405d-ae92-e756037eccc4 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/525a58.pdf "Datasheet as PDF")