--- title: "ZStE 380 — Microalloyed steels" description: "ZStE 380 in DIN / EN: material number 1.0550, also listed as H 360LA. Category: Microalloyed steels. Designations recorded for this grade: 6." canonical: https://steelequivalents.com/materials/din-en/zste-380 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/din-en/zste-380.md cs: https://steelequivalents.com/cs/materiály/din-en/zste-380.md de: https://steelequivalents.com/de/werkstoffe/din-en/zste-380.md es: https://steelequivalents.com/es/materiales/din-en/zste-380.md fr: https://steelequivalents.com/fr/matériaux/din-en/zste-380.md hu: https://steelequivalents.com/hu/anyagok/din-en/zste-380.md it: https://steelequivalents.com/it/materiali/din-en/zste-380.md nl: https://steelequivalents.com/nl/materialen/din-en/zste-380.md pl: https://steelequivalents.com/pl/materiały/din-en/zste-380.md pt: https://steelequivalents.com/pt/materiais/din-en/zste-380.md ru: https://steelequivalents.com/ru/материалы/din-en/zste-380.md tr: https://steelequivalents.com/tr/malzemeler/din-en/zste-380.md zh: https://steelequivalents.com/zh/材料/din-en/zste-380.md ja: https://steelequivalents.com/ja/材料/din-en/zste-380.md ar: https://steelequivalents.com/ar/المواد/din-en/zste-380.md ko: https://steelequivalents.com/ko/재료/din-en/zste-380.md pt-br: https://steelequivalents.com/pt-br/materiais/din-en/zste-380.md hi: https://steelequivalents.com/hi/सामग्री/din-en/zste-380.md content_hash: sha256:2c57e67e3ffd4da8a93890238fc3adfe342e5cf4a87a6bce114aeca2c9be57e7 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/din-en/zste-380 > Canonical URL: https://steelequivalents.com/materials/din-en/zste-380 > 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. DIN / EN · Europe · 6 designations # ZStE 380 ZStE 380 is a designation in DIN / EN for the material held under material number 1.0550, also listed as H 360LA. It is a material in the category Microalloyed steels. We list 6 designations recorded for this grade, in the standards DIN / EN, AISI / SAE, AFNOR and JIS. - [*Material no.* **1.0550**](/materials/material-no/1.0550 "Material no.: 1.0550") - [*Category* **Microalloyed steels · 5 grades**](/categories/microalloyed-steels "Category: Microalloyed steels · 5 grades") - *Designations* **6** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=94bb7f96-56c8-405b-895b-8b2f026bc57e&designation=8b4e43b4-d0de-41ed-a447-b7601d0ee17f "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/zste-380.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN H 360LA This grade’s own name](/materials/din-en/h-360la "DIN / EN H 360LA") ## About Microalloyed steels Microalloyed steels are low-carbon structural steels strengthened and refined by small additions of elements such as titanium, niobium or aluminium. Their measured carbon contents are up to 0.1 percent, with yield strengths from 235 to 355 N/mm², making them suitable for load-bearing fabricated components where strength, toughness and weldability are required. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 6 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 · 3 - [H 360LA This grade’s own name](/materials/din-en/h-360la "DIN / EN H 360LA") - [HC 380 LA This grade’s own name](/materials/din-en/hc-380-la "DIN / EN HC 380 LA") - **ZStE 380 This grade’s own name** AISI / SAE United States · 1 - [Gr.55 Indicative](/materials/aisi-sae/gr-55 "AISI / SAE Gr.55") AFNOR France · 1 - [E355C Indicative](/materials/afnor/e355c "AFNOR E355C") JIS Japan · 1 - [SPFC540 Indicative](/materials/jis/spfc540 "JIS SPFC540") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 8 elements on file · weight % What this alloy is Fe Mn Si Ti Iron — the balance, never listed by a standard — 97.5 % Mn — 1.6 % Si — 0.5 % Ti — 0.2 % Traces & impurities · 0.3 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.1 | | Si | ≤ 0.5 | | Mn | ≤ 1.6 | | P | 0.025 | | S | 0.025 | | Al | ≥ 0.015 | | Ti | ≤ 0.15 | | Nb | ≤ 0.09 | Carbon Silicon Manganese Phosphorus Sulfur Aluminium Titanium Niobium 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 | ≤0,10 | — | 0.100 | Max | | Al | ≥0,015 | 0.015 | — | Min | | Si | ≤0,50 | — | 0.500 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,025 | 0.025 | 0.025 | Exact | | Ti | ≤0,15 | — | 0.150 | Max | | Mn | ≤1,60 | — | 1.600 | Max | | Nb | ≤0,09 | — | 0.090 | 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, Cr, 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. ## Properties by condition 1 conditions · 3 values By delivery state**no delivery state stated** source `steeljis` | Delivery state | Rm N/mm² | Re N/mm² | A% | |---|---|---|---| | Sheet/Strip | 540 | 325 | 20 – 21 | 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 1.0, a shared category, and a published range for Mn / Si 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. [H 400 LA 1.0556 Mn ≤1,60 · Si ≤0,50 - ΔMn 0.00 - ΔSi 0.00 - 9 designations](/materials/din-en/h-400-la "H 400 LA")[H 320 LA 1.0548 Mn ≤1,10 · Si ≤0,50 - ΔMn 0.25 - ΔSi 0.00 - 6 designations](/materials/din-en/h-320-la "H 320 LA")[H 280 LA 1.0489 Mn ≤1,00 · Si ≤0,50 - ΔMn 0.30 - ΔSi 0.00 - 7 designations](/materials/din-en/h-280-la "H 280 LA")[H 240 LA 1.0480 Mn ≤0,60 · Si ≤0,50 - ΔMn 0.50 - ΔSi 0.00 - 5 designations](/materials/din-en/h-240-la "H 240 LA") ## 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=94bb7f96-56c8-405b-895b-8b2f026bc57e&designation=8b4e43b4-d0de-41ed-a447-b7601d0ee17f "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/din-en/zste-380.pdf "Datasheet as PDF")