--- title: "1.0556 — Microalloyed steels" description: "1.0556 is the material number of the grade also listed as H 400 LA. Category: Microalloyed steels. Designations recorded for this grade: 9." canonical: https://steelequivalents.com/materials/material-no/1.0556 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/material-no/1.0556.md cs: https://steelequivalents.com/cs/materiály/číslo-materiálu/1.0556.md de: https://steelequivalents.com/de/werkstoffe/werkstoff-nr/1.0556.md es: https://steelequivalents.com/es/materiales/número-de-material/1.0556.md fr: https://steelequivalents.com/fr/matériaux/numéro-de-matériau/1.0556.md hu: https://steelequivalents.com/hu/anyagok/anyagszám/1.0556.md it: https://steelequivalents.com/it/materiali/numero-materiale/1.0556.md nl: https://steelequivalents.com/nl/materialen/materiaalnummer/1.0556.md pl: https://steelequivalents.com/pl/materiały/numer-materiału/1.0556.md pt: https://steelequivalents.com/pt/materiais/número-do-material/1.0556.md ru: https://steelequivalents.com/ru/материалы/номер-материала/1.0556.md tr: https://steelequivalents.com/tr/malzemeler/malzeme-numarası/1.0556.md zh: https://steelequivalents.com/zh/材料/材料编号/1.0556.md ja: https://steelequivalents.com/ja/材料/材料番号/1.0556.md ar: https://steelequivalents.com/ar/المواد/رقم-المادة/1.0556.md ko: https://steelequivalents.com/ko/재료/재료번호/1.0556.md pt-br: https://steelequivalents.com/pt-br/materiais/número-do-material/1.0556.md hi: https://steelequivalents.com/hi/सामग्री/सामग्री-संख्या/1.0556.md content_hash: sha256:6a3091f8b235d3bc7e80828b46455144f66f60881de21cef9c06541e54483bb5 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/material-no/1.0556 > Canonical URL: https://steelequivalents.com/materials/material-no/1.0556 > 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. Material number · Europe · 9 designations # 1.0556 1.0556 is the material number of the grade also listed as H 400 LA. It is a material in the category Microalloyed steels. We list 9 designations recorded for this grade, in the standards DIN / EN, AISI / SAE, ASTM and JIS. - ***Material no.* **1.0556**** - [*Category* **Microalloyed steels · 5 grades**](/categories/microalloyed-steels "Category: Microalloyed steels · 5 grades") - *Designations* **9** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=828d7fdb-ae0b-45c3-be94-3e4c2f16f7a3 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.0556.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN H 400 LA This grade’s own name](/materials/din-en/h-400-la "DIN / EN H 400 LA") - [ASTM A1008 This grade’s own name · 7 grades on that route](/materials/astm/a1008 "ASTM A1008") ## 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 9 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 · 4 - [H 400 LA This grade’s own name](/materials/din-en/h-400-la "DIN / EN H 400 LA") - [HC 420 LS This grade’s own name](/materials/din-en/hc-420-ls "DIN / EN HC 420 LS") - [HC420LA Indicative](/materials/din-en/hc420la "DIN / EN HC420LA") - [ZStE 420 This grade’s own name](/materials/din-en/zste-420 "DIN / EN ZStE 420") AISI / SAE United States · 1 - [Gr.60 Indicative](/materials/aisi-sae/gr-60 "AISI / SAE Gr.60") ASTM United States · 3 - [A1008 This grade’s own name](/materials/astm/a1008 "ASTM A1008") - [A1011 Grade 55 Class 1 This grade’s own name](/materials/astm/a1011-grade-55-class-1 "ASTM A1011 Grade 55 Class 1") - [A1011 Grade 55 Class 2 This grade’s own name](/materials/astm/a1011-grade-55-class-2 "ASTM A1011 Grade 55 Class 2") JIS Japan · 1 - [SPFC590 Indicative](/materials/jis/spfc590 "JIS SPFC590") 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 | 590 | 355 | 17 – 18 | 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 360LA 1.0550 Mn ≤1,60 · Si ≤0,50 - ΔMn 0.00 - ΔSi 0.00 - 6 designations](/materials/din-en/h-360la "H 360LA")[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=828d7fdb-ae0b-45c3-be94-3e4c2f16f7a3 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/material-no/1.0556.pdf "Datasheet as PDF")