--- title: "T20819 — 38CrCoWV18-17-17, 4 equivalent designations" description: "T20819 in UNS: material number 1.2661, also listed as 38CrCoWV18-17-17. It is a material in the category Others. Designations recorded for this grade: 4." canonical: https://steelequivalents.com/materials/uns/t20819 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/uns/t20819.md cs: https://steelequivalents.com/cs/materiály/uns/t20819.md de: https://steelequivalents.com/de/werkstoffe/uns/t20819.md es: https://steelequivalents.com/es/materiales/uns/t20819.md fr: https://steelequivalents.com/fr/matériaux/uns/t20819.md hu: https://steelequivalents.com/hu/anyagok/uns/t20819.md it: https://steelequivalents.com/it/materiali/uns/t20819.md nl: https://steelequivalents.com/nl/materialen/uns/t20819.md pl: https://steelequivalents.com/pl/materiały/uns/t20819.md pt: https://steelequivalents.com/pt/materiais/uns/t20819.md ru: https://steelequivalents.com/ru/материалы/uns/t20819.md tr: https://steelequivalents.com/tr/malzemeler/uns/t20819.md zh: https://steelequivalents.com/zh/材料/uns/t20819.md ja: https://steelequivalents.com/ja/材料/uns/t20819.md ar: https://steelequivalents.com/ar/المواد/uns/t20819.md ko: https://steelequivalents.com/ko/재료/uns/t20819.md pt-br: https://steelequivalents.com/pt-br/materiais/uns/t20819.md hi: https://steelequivalents.com/hi/सामग्री/uns/t20819.md content_hash: sha256:a92cf04d1e8927246c462df99b813d1a3cb2a2b19291876d26cf51a61ec1b9fa 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/uns/t20819 > Canonical URL: https://steelequivalents.com/materials/uns/t20819 > 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. UNS · United States · 4 designations # T20819 T20819 is a designation in UNS for the material held under material number 1.2661, also listed as 38CrCoWV18-17-17. It is a material in the category Others. We list 4 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE and JIS. - [*Material no.* **1.2661**](/materials/material-no/1.2661 "Material no.: 1.2661") - [*Category* **Others · 1754 grades**](/categories/others "Category: Others · 1754 grades") - *Designations* **4** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=f7b8e732-0bdb-4df4-8473-1efa0f7311b7&designation=1e2820c2-4ac1-4a79-9bc4-1898cb8c7075 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/t20819.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 38CrCoWV18-17-17 This grade’s own name](/materials/din-en/38crcowv18-17-17 "DIN / EN 38CrCoWV18-17-17") - [AISI / SAE H19 This grade’s own name](/materials/aisi-sae/h19 "AISI / SAE H19") ## About Others These are miscellaneous metallic alloys that do not fit a more specific material family and may be based on iron, nickel, cobalt, copper or other alloy systems. They are selected for applications requiring particular combinations of strength, hardness, toughness, wear resistance or resistance to demanding service conditions. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 4 designations · 4 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 - [38CrCoWV18-17-17 This grade’s own name](/materials/din-en/38crcowv18-17-17 "DIN / EN 38CrCoWV18-17-17") UNS United States · 1 - **T20819 This grade’s own name** AISI / SAE United States · 1 - [H19 This grade’s own name](/materials/aisi-sae/h19 "AISI / SAE H19") JIS Japan · 1 - [SKD8 Indicative](/materials/jis/skd8 "JIS SKD8") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 10 elements on file · weight % What this alloy is Fe Cr Co W Iron — the balance, never listed by a standard — 83.8 % Cr — 4.4 % Co — 4.3 % W — 4.2 % Traces & impurities · 3.4 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.35–0.45 | | Si | 0.15–0.5 | | Mn | 0.2–0.5 | | P | 0.03 | | S | 0.02 | | Cr | 4–4.7 | | Mo | 0.3–0.5 | | V | 1.7–2.1 | | W | 3.8–4.5 | | Co | 4–4.5 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Vanadium Tungsten Cobalt 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 | 0,35-0,45 | 0.350 | 0.450 | Range | | Si | 0,15-0,50 | 0.150 | 0.500 | Range | | P | 0,03 | 0.030 | 0.030 | Exact | | S | 0,02 | 0.020 | 0.020 | Exact | | V | 1,70-2,10 | 1.700 | 2.100 | Range | | Cr | 4,00-4,70 | 4.000 | 4.700 | Range | | Mn | 0,20-0,50 | 0.200 | 0.500 | Range | | Co | 4,00-4,50 | 4.000 | 4.500 | Range | | Mo | 0,30-0,50 | 0.300 | 0.500 | Range | | W | 3,80-4,50 | 3.800 | 4.500 | 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 7,85 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. ## Properties by condition 2 conditions · 3 values By delivery state**no delivery state stated** source `steeljis` | Delivery state | HB | HRC | |---|---|---| | Annealed | 262 | — | | Quenched and tempered | — | 48 | By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 260 | 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=f7b8e732-0bdb-4df4-8473-1efa0f7311b7&designation=1e2820c2-4ac1-4a79-9bc4-1898cb8c7075 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/uns/t20819.pdf "Datasheet as PDF")