--- title: "15Cr9q — Case hardening steels" description: "15Cr9q in STAS: material number 1.7015, also listed as 15Cr3. It is a material in the category Case hardening steels. Designations recorded for this grade: 36." canonical: https://steelequivalents.com/materials/stas/15cr9q language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/stas/15cr9q.md cs: https://steelequivalents.com/cs/materiály/stas/15cr9q.md de: https://steelequivalents.com/de/werkstoffe/stas/15cr9q.md es: https://steelequivalents.com/es/materiales/stas/15cr9q.md fr: https://steelequivalents.com/fr/matériaux/stas/15cr9q.md hu: https://steelequivalents.com/hu/anyagok/stas/15cr9q.md it: https://steelequivalents.com/it/materiali/stas/15cr9q.md nl: https://steelequivalents.com/nl/materialen/stas/15cr9q.md pl: https://steelequivalents.com/pl/materiały/stas/15cr9q.md pt: https://steelequivalents.com/pt/materiais/stas/15cr9q.md ru: https://steelequivalents.com/ru/материалы/stas/15cr9q.md tr: https://steelequivalents.com/tr/malzemeler/stas/15cr9q.md zh: https://steelequivalents.com/zh/材料/stas/15cr9q.md ja: https://steelequivalents.com/ja/材料/stas/15cr9q.md ar: https://steelequivalents.com/ar/المواد/stas/15cr9q.md ko: https://steelequivalents.com/ko/재료/stas/15cr9q.md pt-br: https://steelequivalents.com/pt-br/materiais/stas/15cr9q.md hi: https://steelequivalents.com/hi/सामग्री/stas/15cr9q.md content_hash: sha256:b012d0f4a4925b69027acb0e20d11100af3adbbe952390150386d91166181bd7 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/stas/15cr9q > Canonical URL: https://steelequivalents.com/materials/stas/15cr9q > 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. STAS · Romania · 36 designations # 15Cr9q 15Cr9q is a designation in STAS for the material held under material number 1.7015, also listed as 15Cr3. It is a material in the category Case hardening steels. We list 36 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, UNE, JIS, GB, GOST, ČSN, PN, STAS, BDS, NBN and KS. - [*Material no.* **1.7015**](/materials/material-no/1.7015 "Material no.: 1.7015") - [*Category* **Case hardening steels · 60 grades**](/categories/case-hardening-steels "Category: Case hardening steels · 60 grades") - *Designations* **36** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=3a78975b-26bf-4535-baf5-255e9731b711&designation=86655954-c489-4d1b-b908-db0d3f9db375 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/stas/15cr9q.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 15Cr3 This grade’s own name](/materials/din-en/15cr3 "DIN / EN 15Cr3") - [UNS G50150 This grade’s own name · 2 grades on that route](/materials/uns/g50150 "UNS G50150") - [AISI / SAE 5015 This grade’s own name · 2 grades on that route](/materials/aisi-sae/5015 "AISI / SAE 5015") ## About Case hardening steels Case hardening steels are steels designed to develop a hard, wear-resistant surface while retaining a tough and ductile core. They are used for components such as gears, shafts and other machine parts exposed to contact wear and cyclic loading. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 36 designations · 16 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 - [1.7015 Indicative](/materials/material-no/1.7015 "DIN / EN 1.7015") - [15Cr3 This grade’s own name](/materials/din-en/15cr3 "DIN / EN 15Cr3") UNS United States · 1 - [G50150 This grade’s own name](/materials/uns/g50150 "UNS G50150") AISI / SAE United States · 6 - [5015 This grade’s own name](/materials/aisi-sae/5015 "AISI / SAE 5015") - [5115 Indicative](/materials/aisi-sae/5115 "AISI / SAE 5115") - [G50150 Indicative](/materials/uns/g50150 "AISI / SAE G50150") - [G51150 Indicative](/materials/uns/g51150 "AISI / SAE G51150") - [G51170 Indicative](/materials/uns/g51170 "AISI / SAE G51170") - [G61180 Indicative](/materials/uns/g61180 "AISI / SAE G61180") ASTM United States · 1 - [5115 Indicative](/materials/aisi-sae/5115 "ASTM 5115") BS United Kingdom · 2 - [17Cr3 Indicative](/materials/din-en/17cr3 "BS 17Cr3") - [523M15 Indicative](/materials/bs/523m15 "BS 523M15") AFNOR France · 5 - [12C3 Indicative](/materials/afnor/12c3 "AFNOR 12C3") - [12C8 Indicative](/materials/afnor/12c8 "AFNOR 12C8") - [15Cr2RR Indicative](/materials/afnor/15cr2rr "AFNOR 15Cr2RR") - [17Cr3 Indicative](/materials/din-en/17cr3 "AFNOR 17Cr3") - [18C3 Indicative](/materials/afnor/18c3 "AFNOR 18C3") UNE Spain · 1 - [17Cr3 Indicative](/materials/din-en/17cr3 "UNE 17Cr3") JIS Japan · 2 - [SCr415 Indicative](/materials/ks/scr415 "JIS SCr415") - [SCr415H Indicative](/materials/ks/scr415h "JIS SCr415H") GB China · 3 - [15Cr Indicative](/materials/gb/15cr "GB 15Cr") - [15CrA Indicative](/materials/gb/15cra "GB 15CrA") - [ML15Cr Indicative](/materials/gb/ml15cr "GB ML15Cr") GOST Russia / CIS · 6 - [15Ch Indicative](/materials/bds/15ch "GOST 15Ch") - [15KH Indicative](/materials/gost/15kh "GOST 15KH") - [15KHА Indicative](/materials/gost/15kha "GOST 15KHА") - [15X Indicative](/materials/pn/15x "GOST 15X") - [15Х Indicative](/materials/gost/15kh "GOST 15Х") - [ст.15Х Indicative](/materials/gost/st-15kh "GOST ст.15Х") ČSN Czechia · 1 - [14120 Indicative](/materials/csn/14120 "ČSN 14120") PN Poland · 1 - [15H Indicative](/materials/pn/15h "PN 15H") STAS Romania · 1 - **15Cr9q Indicative** BDS Bulgaria · 1 - [15Ch Indicative](/materials/bds/15ch "BDS 15Ch") NBN Belgium · 1 - [15Cr2 Indicative](/materials/nbn/15cr2 "NBN 15Cr2") KS South Korea · 2 - [SCr415 Indicative](/materials/ks/scr415 "KS SCr415") - [SCr415H Indicative](/materials/ks/scr415h "KS SCr415H") 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 Si Iron — the balance, never listed by a standard — 98.4 % Cr — 0.6 % Mn — 0.5 % Si — 0.3 % Traces & impurities · 0.2 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.12–0.18 | | Si | 0.15–0.4 | | Mn | 0.4–0.6 | | P | 0.035 | | S | 0.035 | | Cr | 0.4–0.7 | | Al | ≥ 0.02 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Aluminium 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 | 0,12-0,18 | 0.120 | 0.180 | Range | | Al | (≥0,02) | 0.020 | — | Min | | Si | 0,15-0,40 | 0.150 | 0.400 | Range | | P | 0,035 | 0.035 | 0.035 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | Cr | 0,40-0,70 | 0.400 | 0.700 | Range | | Mn | 0,40-0,60 | 0.400 | 0.600 | 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, Mo. ## Physical & mechanical properties Density 7,85 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. ## Heat treatment **GJB 1220** In this order d=15 1. Quenching 860 °C 2. Quenching 780 °C Cooling Water 3. Tempering 200 °C Cooling Air Supply condition - Normalizing and Tempering d≤100 - Carburizing - Quenching - Quenching and Tempering d=15 - Annealing and Tempering and Normalizing Supply condition - Spheroidize annealing Plate and Strip - Annealing or Tempering Steel product - Annealing 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/azhlNWIxMTY3Njg_ "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. [20CrMoS2 1.7311 Cr 0,50-0,70 · Mn 0,60-0,80 - ΔCr 0.05 - ΔMn 0.20 - 2 designations](/materials/din-en/20crmos2 "20CrMoS2")[20MoCrS3 1.7319 Cr 0,40-0,70 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.25 - 3 designations](/materials/din-en/20mocrs3 "20MoCrS3")[20MoCr3 1.7320 Cr 0,40-0,70 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.25 - 3 designations](/materials/din-en/20mocr3 "20MoCr3")[25MoCr4 1.7325 Cr 0,40-0,60 · Mn 0,60-0,90 - ΔCr 0.05 - ΔMn 0.25 - 5 designations](/materials/din-en/25mocr4 "25MoCr4")[25MoCrS4 1.7326 Cr 0,40-0,60 · Mn 0,60-0,90 - ΔCr 0.05 - ΔMn 0.25 - 2 designations](/materials/din-en/25mocrs4 "25MoCrS4")[22CrV3 1.7511 Cr 0,65-0,80 · Mn 0,60-0,75 - ΔCr 0.18 - ΔMn 0.18 - 5 designations](/materials/din-en/22crv3 "22CrV3") ## 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=3a78975b-26bf-4535-baf5-255e9731b711&designation=86655954-c489-4d1b-b908-db0d3f9db375 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/stas/15cr9q.pdf "Datasheet as PDF")