--- title: "A3k — Unalloyed structural steels" description: "A3k in STAS: material number 1.0338, also listed as DC 04. Category: Unalloyed structural steels. Designations recorded for this grade: 69." canonical: https://steelequivalents.com/materials/stas/a3k language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/stas/a3k.md cs: https://steelequivalents.com/cs/materiály/stas/a3k.md de: https://steelequivalents.com/de/werkstoffe/stas/a3k.md es: https://steelequivalents.com/es/materiales/stas/a3k.md fr: https://steelequivalents.com/fr/matériaux/stas/a3k.md hu: https://steelequivalents.com/hu/anyagok/stas/a3k.md it: https://steelequivalents.com/it/materiali/stas/a3k.md nl: https://steelequivalents.com/nl/materialen/stas/a3k.md pl: https://steelequivalents.com/pl/materiały/stas/a3k.md pt: https://steelequivalents.com/pt/materiais/stas/a3k.md ru: https://steelequivalents.com/ru/материалы/stas/a3k.md tr: https://steelequivalents.com/tr/malzemeler/stas/a3k.md zh: https://steelequivalents.com/zh/材料/stas/a3k.md ja: https://steelequivalents.com/ja/材料/stas/a3k.md ar: https://steelequivalents.com/ar/المواد/stas/a3k.md ko: https://steelequivalents.com/ko/재료/stas/a3k.md pt-br: https://steelequivalents.com/pt-br/materiais/stas/a3k.md hi: https://steelequivalents.com/hi/सामग्री/stas/a3k.md content_hash: sha256:21c27b67a574421fa7f809596c17015a07567a1b900ca79f4b1bf8088d828f32 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/a3k > Canonical URL: https://steelequivalents.com/materials/stas/a3k > 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 · 69 designations # A3k A3k is a designation in STAS for the material held under material number 1.0338, also listed as DC 04. It is a material in the category Unalloyed structural steels. We list 69 designations recorded for this grade, in the standards DIN / EN, AISI / SAE, ASTM, BS, AFNOR, UNE, ISO, JIS, GB, GOST, UNI, SS, ČSN, PN, STN, STAS, AS / NZS, ÖNORM and SFS. - [*Material no.* **1.0338**](/materials/material-no/1.0338 "Material no.: 1.0338") - [*Category* **Unalloyed structural steels · 452 grades**](/categories/unalloyed-structural-steels "Category: Unalloyed structural steels · 452 grades") - *Designations* **69** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=77051672-a1d5-4fc3-8345-f604d0623eec&designation=4e1e30c6-249e-4265-95e1-9ad55d49bcb4 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/stas/a3k.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN DC 04 This grade’s own name](/materials/din-en/dc04 "DIN / EN DC 04") - [GB DC03 This grade’s own name](/materials/gb/dc03 "GB DC03") ## About Unalloyed structural steels Unalloyed structural steels include all low-carbon steels in which the iron companions do not exceed specified minimum values. The yield strength, formability and weldability are the decisive factors for their use. They are soft, pliable, tough and stretchy, but cannot be hardened by heat treatment. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 69 designations · 19 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 · 7 - [1.0338 Indicative](/materials/material-no/1.0338 "DIN / EN 1.0338") - [DC 04 This grade’s own name](/materials/din-en/dc04 "DIN / EN DC 04") - [DDS Indicative](/materials/din-en/dds "DIN / EN DDS") - [FeP04 Indicative](/materials/uni/fep04 "DIN / EN FeP04") - [RRSt14 Indicative](/materials/din-en/rrst14 "DIN / EN RRSt14") - [St 14 This grade’s own name Withdrawn](/materials/din-en/st-14 "DIN / EN St 14") - [St 4 This grade’s own name](/materials/din-en/st4 "DIN / EN St 4") AISI / SAE United States · 4 - [A619 Indicative](/materials/aisi-sae/a619 "AISI / SAE A619") - [A620 Indicative](/materials/aisi-sae/a620 "AISI / SAE A620") - [DDS Indicative](/materials/din-en/dds "AISI / SAE DDS") - [K00040 Indicative](/materials/aisi-sae/k00040 "AISI / SAE K00040") ASTM United States · 1 - [A620 Indicative](/materials/aisi-sae/a620 "ASTM A620") BS United Kingdom · 15 - [1449 Indicative](/materials/bs/1449 "BS 1449") - [1449-12CR Indicative](/materials/bs/1449-12cr "BS 1449-12CR") - [1449-1CR Indicative](/materials/bs/1449-1cr "BS 1449-1CR") - [1449-3CR Indicative](/materials/bs/1449-3cr "BS 1449-3CR") - [1CR Indicative](/materials/bs/1cr "BS 1CR") - [1CS Indicative](/materials/bs/1cs "BS 1CS") - [1HR Indicative](/materials/bs/1hr "BS 1HR") - [1HS Indicative](/materials/bs/1hs "BS 1HS") - [2CR Indicative](/materials/bs/2cr "BS 2CR") - [2HR Indicative](/materials/bs/2hr "BS 2HR") - [3HR Indicative](/materials/bs/3hr "BS 3HR") - [CR1 Indicative](/materials/is/cr1 "BS CR1") - [DC03 Indicative](/materials/gb/dc03 "BS DC03") - [DC04 Indicative](/materials/din-en/dc04 "BS DC04") - [FeP01 Indicative](/materials/afnor/fep01 "BS FeP01") AFNOR France · 5 - [3C Indicative](/materials/afnor/3c "AFNOR 3C") - [DC03 Indicative](/materials/gb/dc03 "AFNOR DC03") - [DC04 Indicative](/materials/din-en/dc04 "AFNOR DC04") - [ES Indicative](/materials/afnor/es "AFNOR ES") - [FeP01 Indicative](/materials/afnor/fep01 "AFNOR FeP01") UNE Spain · 3 - [AP04 Indicative](/materials/une/ap04 "UNE AP04") - [DC03 Indicative](/materials/gb/dc03 "UNE DC03") - [DC04 Indicative](/materials/din-en/dc04 "UNE DC04") ISO International · 2 - [Cr04 Indicative](/materials/iso/cr04 "ISO Cr04") - [CR24 Indicative](/materials/iso/cr24 "ISO CR24") JIS Japan · 3 - [CR4 Indicative](/materials/is/cr4 "JIS CR4") - [SPCC Indicative](/materials/jis/spcc "JIS SPCC") - [SPCE Indicative](/materials/jis/spce "JIS SPCE") GB China · 2 - [DC03 This grade’s own name](/materials/gb/dc03 "GB DC03") - [DC04 This grade’s own name](/materials/din-en/dc04 "GB DC04") GOST Russia / CIS · 4 - [05kp Indicative](/materials/bds/05kp "GOST 05kp") - [08kp Indicative](/materials/gost/08kp "GOST 08kp") - [08YU Indicative](/materials/gost/08yu "GOST 08YU") - [08Ю Indicative](/materials/gost/08yu "GOST 08Ю") UNI Italy · 5 - [DC01 Indicative](/materials/din-en/dc01 "UNI DC01") - [DC03 Indicative](/materials/gb/dc03 "UNI DC03") - [DC04 Indicative](/materials/din-en/dc04 "UNI DC04") - [FeP02 Indicative](/materials/uni/fep02 "UNI FeP02") - [FeP04 Indicative](/materials/uni/fep04 "UNI FeP04") SS Sweden · 2 - [1142 Indicative](/materials/ss/1142 "SS 1142") - [1147 Indicative](/materials/ss/1147 "SS 1147") ČSN Czechia · 3 - [11305 Indicative](/materials/csn/11305 "ČSN 11305") - [11321 Indicative](/materials/csn/11321 "ČSN 11321") - [11325 Indicative](/materials/csn/11325 "ČSN 11325") PN Poland · 2 - [08J Indicative](/materials/pn/08j "PN 08J") - [08JA Indicative](/materials/pn/08ja "PN 08JA") STN Slovakia · 1 - [11 305 Indicative](/materials/csn/11305 "STN 11 305") STAS Romania · 1 - **A3k Indicative** AS / NZS Australia / New Zealand · 5 - [CA2 Indicative](/materials/as-nzs/ca2 "AS / NZS CA2") - [CA3 Indicative](/materials/as-nzs/ca3 "AS / NZS CA3") - [CA4 Indicative](/materials/as-nzs/ca4 "AS / NZS CA4") - [HA3 Indicative](/materials/as-nzs/ha3 "AS / NZS HA3") - [HA4N Indicative](/materials/as-nzs/ha4n "AS / NZS HA4N") ÖNORM Austria · 2 - [St02F Indicative](/materials/onorm/st02f "ÖNORM St02F") - [St04F Indicative](/materials/onorm/st04f "ÖNORM St04F") SFS Finland · 2 - [RACOLD03F Indicative](/materials/sfs/racold03f "SFS RACOLD03F") - [RACOLD04F Indicative](/materials/sfs/racold04f "SFS RACOLD04F") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 4 elements on file · weight % What this alloy is Fe Mn C P Iron — the balance, never listed by a standard — 99.5 % Mn — 0.4 % C — 0.1 % P — 0 % Traces & impurities · 0 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.08 | | Mn | ≤ 0.4 | | P | 0.03 | | S | 0.03 | Carbon Manganese Phosphorus Sulfur 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 | ≤0,08 | — | 0.080 | Max | | P | 0,03 | 0.030 | 0.030 | Exact | | S | 0,03 | 0.030 | 0.030 | Exact | | Mn | ≤0,40 | — | 0.400 | 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: Si, Ni, Cr, Mo. ## Physical & mechanical properties Density 7,85 g/cm³ Exact Weldability readily weldable As published: without limitations. Flake sensitivity not susceptible As published: not predisposed Temper brittleness not susceptible As published: not 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 5 conditions · 21 values By dimension**no delivery state stated** source `caishuku` | Thickness mm | Rm N/mm² | Re N/mm² | A% | |---|---|---|---| | 0.3 – 0.5 | 270 – 370 | ≤ 240 | ≥ 30 | | 0.5 – 0.7 | 270 – 370 | ≤ 240 | ≥ 32 | | ≥ 0.7 | 270 – 370 | ≤ 240 | ≥ 34 | By delivery state**no delivery state stated** source `splav` | Delivery state | Rm N/mm² | Re N/mm² | A5% | HB | |---|---|---|---|---| | Pipe, GOST 10705-80 | 255 | 174 | 30 | — | | Sheet GOST 4041-71 | — | — | — | 118 | | (annealing) , Strip GOST 1577-93 | — | — | — | 131 | By delivery state**Soft annealed** source `steelnumber` | Delivery state | HV | |---|---| | Soft annealed | 100 | By dimension**no delivery state stated** source `splav` | Dimension mm | Rm N/mm² | A5% | |---|---|---| | 4 - 8 | 360 | 36 | By dimension**Normalizing** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | A5% | Z% | |---|---|---|---|---| | 6 - 60 | 290 | 175 | 35 | 60 | 1 further values are held for this grade under a condition the source did not name — a bound with no quantity attached. They are withheld rather than shown against a guessed condition. 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. ## Heat treatment Supply condition - 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/azhlNWIxMTU2MjE_ "Source: www.caishuku.com") ## 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=77051672-a1d5-4fc3-8345-f604d0623eec&designation=4e1e30c6-249e-4265-95e1-9ad55d49bcb4 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/stas/a3k.pdf "Datasheet as PDF")