--- title: "SchCh15SG — Bearing steels" description: "SchCh15SG in GOST: material number 1.3520, also listed as 100CrMnSi6-4. Category: Bearing steels. Designations recorded for this grade: 33." canonical: https://steelequivalents.com/materials/gost/schch15sg language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gost/schch15sg.md cs: https://steelequivalents.com/cs/materiály/gost/schch15sg.md de: https://steelequivalents.com/de/werkstoffe/gost/schch15sg.md es: https://steelequivalents.com/es/materiales/gost/schch15sg.md fr: https://steelequivalents.com/fr/matériaux/gost/schch15sg.md hu: https://steelequivalents.com/hu/anyagok/gost/schch15sg.md it: https://steelequivalents.com/it/materiali/gost/schch15sg.md nl: https://steelequivalents.com/nl/materialen/gost/schch15sg.md pl: https://steelequivalents.com/pl/materiały/gost/schch15sg.md pt: https://steelequivalents.com/pt/materiais/gost/schch15sg.md ru: https://steelequivalents.com/ru/материалы/gost/schch15sg.md tr: https://steelequivalents.com/tr/malzemeler/gost/schch15sg.md zh: https://steelequivalents.com/zh/材料/gost/schch15sg.md ja: https://steelequivalents.com/ja/材料/gost/schch15sg.md ar: https://steelequivalents.com/ar/المواد/gost/schch15sg.md ko: https://steelequivalents.com/ko/재료/gost/schch15sg.md pt-br: https://steelequivalents.com/pt-br/materiais/gost/schch15sg.md hi: https://steelequivalents.com/hi/सामग्री/gost/schch15sg.md content_hash: sha256:d96f5524f9866e08d31fe77d9c8b286ee7dc6020c2c69c71e8f2e12872722ee0 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/gost/schch15sg > Canonical URL: https://steelequivalents.com/materials/gost/schch15sg > 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. GOST · Russia / CIS · 33 designations # SchCh15SG SchCh15SG is a designation in GOST for the material held under material number 1.3520, also listed as 100CrMnSi6-4. It is a material in the category Bearing steels. We list 33 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, UNE, ISO, JIS, GB, GOST, ČSN, STN, PN, MSZ, STAS and BDS. - [*Material no.* **1.3520**](/materials/material-no/1.3520 "Material no.: 1.3520") - [*Category* **Bearing steels · 17 grades**](/categories/bearing-steels "Category: Bearing steels · 17 grades") - *Designations* **33** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=72d5bc3c-abc8-4012-bf71-422cf9e3e29c&designation=f77abc5b-0dc1-4b35-8253-ca051c2c6cf7 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/schch15sg.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 100CrMnSi6-4 This grade’s own name](/materials/din-en/100crmnsi6-4 "DIN / EN 100CrMnSi6-4") - [UNS K19195 This grade’s own name](/materials/uns/k19195 "UNS K19195") - [ASTM A485 Gr1 This grade’s own name](/materials/astm/a485-gr1 "ASTM A485 Gr1") ## About Bearing steels Bearing steels are high-carbon steels designed for rolling-element bearings and other components exposed to repeated contact loading. They are characterised by high hardness, wear resistance and resistance to rolling-contact fatigue after suitable heat treatment. They are used for bearing rings, races and rolling elements where reliable operation under cyclic loads is required. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 33 designations · 17 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 - [100CrMn6 This grade’s own name Withdrawn](/materials/din-en/100crmn6 "DIN / EN 100CrMn6") - [100CrMnSi6-4 This grade’s own name](/materials/din-en/100crmnsi6-4 "DIN / EN 100CrMnSi6-4") UNS United States · 2 - [A 485 Indicative](/materials/aisi-sae/a485 "UNS A 485") - [K19195 This grade’s own name](/materials/uns/k19195 "UNS K19195") AISI / SAE United States · 3 - [A485 Indicative](/materials/aisi-sae/a485 "AISI / SAE A485") - [Gr.2 Indicative](/materials/aisi-sae/gr-2 "AISI / SAE Gr.2") - [K19195 Indicative](/materials/uns/k19195 "AISI / SAE K19195") ASTM United States · 2 - [A485 Indicative](/materials/aisi-sae/a485 "ASTM A485") - [A485 Gr1 This grade’s own name](/materials/astm/a485-gr1 "ASTM A485 Gr1") BS United Kingdom · 1 - [535A99 Indicative](/materials/bs/535a99 "BS 535A99") AFNOR France · 2 - [100CM6 Indicative](/materials/afnor/100cm6 "AFNOR 100CM6") - [100CrMn6 Indicative](/materials/din-en/100crmn6 "AFNOR 100CrMn6") UNE Spain · 2 - [100CrMn6 Indicative](/materials/din-en/100crmn6 "UNE 100CrMn6") - [F-1312 Indicative](/materials/une/f-1312 "UNE F-1312") ISO International · 2 - [100CrMnSi6-4 Indicative](/materials/din-en/100crmnsi6-4 "ISO 100CrMnSi6-4") - [3520 Indicative](/materials/iso/3520 "ISO 3520") JIS Japan · 1 - [SUJ3 Indicative](/materials/jis/suj3 "JIS SUJ3") GB China · 3 - [Cr9SiMn Indicative](/materials/gb/cr9simn "GB Cr9SiMn") - [GCr15SiMn Indicative](/materials/gb/gcr15simn "GB GCr15SiMn") - [GCr9SiMn Indicative](/materials/gb/gcr9simn "GB GCr9SiMn") GOST Russia / CIS · 4 - [Šch15SG Indicative](/materials/gost/sch15sg "GOST Šch15SG") - **SchCh15SG This grade’s own name** - [SHKH15SG Indicative](/materials/gost/shkh15sg "GOST SHKH15SG") - [ШХ15СГ Indicative](/materials/gost/shkh15sg "GOST ШХ15СГ") ČSN Czechia · 1 - [14209 Indicative](/materials/csn/14209 "ČSN 14209") STN Slovakia · 1 - [14 209 Indicative](/materials/csn/14209 "STN 14 209") PN Poland · 3 - [LH15SG Indicative](/materials/pn/lh15sg "PN LH15SG") - [ŁH15SG Indicative](/materials/pn/lh15sg "PN ŁH15SG") - [NCMS Indicative](/materials/pn/ncms "PN NCMS") MSZ Hungary · 1 - [GO4 Indicative](/materials/msz/go4 "MSZ GO4") STAS Romania · 2 - [RUL2 Indicative](/materials/stas/rul2 "STAS RUL2") - [RUL2v Indicative](/materials/stas/rul2v "STAS RUL2v") BDS Bulgaria · 1 - **SchCh15SG Indicative** 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 Cr Mn C Iron — the balance, never listed by a standard — 95.4 % Cr — 1.5 % Mn — 1.1 % C — 1 % Traces & impurities · 1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.93–1.05 | | Si | 0.45–0.75 | | Mn | 1–1.2 | | P | 0.025 | | S | 0.015 | | Cr | 1.4–1.65 | | Cu | ≤ 0.3 | | Al | ≤ 0.05 | | O | ≤ 0.0015 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Copper Aluminium Oxygen 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 | 0,93-1,05 | 0.930 | 1.050 | Range | | O | ≤0,0015 | — | 0.002 | Max | | Al | ≤0,050 | — | 0.050 | Max | | Si | 0,45-0,75 | 0.450 | 0.750 | Range | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Cr | 1,40-1,65 | 1.400 | 1.650 | Range | | Mn | 1,00-1,20 | 1.000 | 1.200 | Range | | Cu | ≤0,30 | — | 0.300 | 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, Mo. ## Physical & mechanical properties Density 7,56 g/cm³ Exact Transformation point Ac1 750 °C Exact Transformation point Ac3 910 °C Exact · Ac3(Acm) Transformation point Ar1 688 °C Exact Flake sensitivity susceptible As published: predisposed Temper brittleness susceptible As published: 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 3 conditions · 10 values By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | Re N/mm² | A5% | Z% | KCU kJ/m² | |---|---|---|---|---|---| | Steel | 590 – 730 | 370 – 410 | 20 | 45 | 440 | By delivery state**no delivery state stated** source `splav` | Delivery state | HB | |---|---| | (hot-rolled) , Rolled stock GOST 801-78 | 179 – 217 | At temperature**no delivery state stated** source `splav` | Temperature °C | Density g/cm³ | Elastic modulus GPa | Thermal expansion coefficient 10^-6/K | |---|---|---|---| | 20 | 7.65 | 211 | — | | 200 | — | — | 13.4 | | 300 | — | — | 13.6 | 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. ## 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=72d5bc3c-abc8-4012-bf71-422cf9e3e29c&designation=f77abc5b-0dc1-4b35-8253-ca051c2c6cf7 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/schch15sg.pdf "Datasheet as PDF")