--- title: "St4W — Unalloyed structural steels" description: "St4W in PN: material number 1.0143, also listed as St 44-3 U. Category: Unalloyed structural steels. 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Compare it to detect a real > content change; `generated` moves on every render and is not a change signal. PN · Poland · 25 designations # St4W St4W is a designation in PN for the material held under material number 1.0143, also listed as St 44-3 U. It is a material in the category Unalloyed structural steels. We list 25 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, ISO, NS, NP, GB, GOST, UNI, PN, MSZ, SANS, ÖNORM and NBN. - [*Material no.* **1.0143**](/materials/material-no/1.0143 "Material no.: 1.0143") - [*Category* **Unalloyed structural steels · 452 grades**](/categories/unalloyed-structural-steels "Category: Unalloyed structural steels · 452 grades") - *Designations* **25** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=80ae889b-6564-4d35-9718-e8b84ee00525&designation=ddf50a7a-9be2-4564-a66b-f95cb4b6e323 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/pn/st4w.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN S275J0 This grade’s own name](/materials/din-en/s275j0 "DIN / EN S275J0") - [UNS K02702 This grade’s own name · 4 grades on that route](/materials/uns/k02702 "UNS K02702") ## 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 25 designations · 17 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 Withdrawn designation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once. Superseded by the current name this withdrawn designation was replaced by — the same grade under its present designation, the one to order by today. DIN / EN Europe · 5 - [Fe430C Indicative](/materials/iso/fe430c "DIN / EN Fe430C") - [P265GH Indicative](/materials/din-en/p265gh "DIN / EN P265GH") - [S275J0 This grade’s own name](/materials/din-en/s275j0 "DIN / EN S275J0")Formerly St 44-3 U - [St 44-3 U This grade’s own name Withdrawn](/materials/din-en/st-44-3-u "DIN / EN St 44-3 U")Superseded by[S275J0](/materials/din-en/s275j0 "S275J0") - [St44-3 Indicative](/materials/din-en/st44-3 "DIN / EN St44-3") UNS United States · 1 - [K02702 This grade’s own name](/materials/uns/k02702 "UNS K02702") AISI / SAE United States · 1 - [A578Gr.70 Indicative](/materials/aisi-sae/a578gr-70 "AISI / SAE A578Gr.70") BS United Kingdom · 2 - [43C Indicative](/materials/bs/43c "BS 43C") - [Gr 43C Indicative](/materials/bs/gr-43c "BS Gr 43C") AFNOR France · 1 - [E28-3 Indicative](/materials/afnor/e28-3 "AFNOR E28-3") UNE Spain · 2 - [AE255C Indicative](/materials/une/ae255c "UNE AE255C") - [AE275C Indicative](/materials/une/ae275c "UNE AE275C") ISO International · 1 - [E275C Indicative](/materials/is/e275c "ISO E275C") NS Norway · 1 - [NS12143 Indicative](/materials/ns/ns12143 "NS NS12143") NP Portugal · 1 - [FE430-C Indicative](/materials/iso/fe430c "NP FE430-C") GB China · 1 - [Q275 Indicative](/materials/gb/q275 "GB Q275") GOST Russia / CIS · 2 - [St4ps Indicative](/materials/gost/st4ps "GOST St4ps") - [St4sp Indicative](/materials/gost/st4sp "GOST St4sp") UNI Italy · 1 - [Fe430C Indicative](/materials/iso/fe430c "UNI Fe430C") PN Poland · 1 - **St4W Indicative** MSZ Hungary · 2 - [45 C Indicative](/materials/msz/45-c "MSZ 45 C") - [Fe 275 C Indicative](/materials/msz/fe-275-c "MSZ Fe 275 C") SANS South Africa · 1 - [300 WC Indicative](/materials/sans/300-wc "SANS 300 WC") ÖNORM Austria · 1 - [St430C Indicative](/materials/onorm/st430c "ÖNORM St430C") NBN Belgium · 1 - [AE295C Indicative](/materials/nbn/ae295c "NBN AE295C") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 6 elements on file · weight % What this alloy is Fe Mn Cu C Iron — the balance, never listed by a standard — 97.7 % Mn — 1.5 % Cu — 0.6 % C — 0.2 % Traces & impurities · 0.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.18 | | Mn | ≤ 1.5 | | P | 0.03 | | S | 0.03 | | Cu | ≤ 0.55 | | N | 0.012 | Carbon Manganese Phosphorus Sulfur Copper Nitrogen 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 | ≤0,18 | — | 0.180 | Max | | N | 0,012 | 0.012 | 0.012 | Exact | | P | 0,03 | 0.030 | 0.030 | Exact | | S | 0,03 | 0.030 | 0.030 | Exact | | Mn | ≤1,50 | — | 1.500 | Max | | Cu | ≤0,55 | — | 0.550 | 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 weldable with restrictions As published: limited weldability. 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 4 conditions · 32 values By thickness**Flat and long products** source `steelnumber` | Thickness mm | ReH N/mm² | Rm N/mm² | |---|---|---| | ≤ 3 | — | 430 – 580 | | 3 – 100 | — | 410 – 560 | | ≤ 16 | 275 | — | | 16 – 40 | 265 | — | | 40 – 63 | 255 | — | | 63 – 80 | 245 | — | | 80 – 100 | 235 | — | | 100 – 150 | 225 | 400 – 540 | | 150 – 250 | — | 380 – 540 | | 150 – 200 | 215 | — | | 200 – 250 | 205 | — | By thickness**no delivery state stated** source `steelnumber` | Thickness mm | A80% · Lo = 80 mm | A% · Lo = 5,65 √So | |---|---|---| | ≤ 1 | 15 | — | | 1 – 1.5 | 16 | — | | 1.5 – 2 | 17 | — | | 2 – 2.5 | 18 | — | | 2.5 – 3 | 19 | — | | 3 – 40 | — | 23 | | 40 – 63 | — | 22 | | 63 – 100 | — | 21 | | 100 – 150 | — | 19 | | 150 – 250 | — | 18 | By delivery state**no delivery state stated** source `splav` | Delivery state | Rm N/mm² | Re N/mm² | A5% | |---|---|---|---| | Pipe, GOST 10705-80 | 412 | 245 | 21 | | Rolled stock, GOST 535-2005 | 410 – 530 | 235 – 265 | 21 – 24 | | Sheet trick, GOST 14637-89 | 410 – 530 | 235 – 265 | 21 – 23 | At temperature**no delivery state stated** source `splav` | Temperature °C | Density g/cm³ | |---|---| | 20 | 7.85 | 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 / Cu 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. [Gr.D 1.0044 Mn ≤1,50 · Cu ≤0,55 - ΔMn 0.00 - ΔCu 0.00 - 130 designations](/materials/din-en/gr-d "Gr.D")[Fe430D2 1.0145 Mn ≤1,50 · Cu ≤0,55 - ΔMn 0.00 - ΔCu 0.00 - 11 designations](/materials/din-en/fe430d2 "Fe430D2")[1.0038 1.0038 Mn ≤1,40 · Cu ≤0,55 - ΔMn 0.05 - ΔCu 0.00 - 152 designations](/materials/material-no/1.0038 "1.0038")[S355JR 1.0045 Mn ≤1,60 · Cu ≤0,55 - ΔMn 0.05 - ΔCu 0.00 - 32 designations](/materials/din-en/s355jr "S355JR")[A284D 1.0114 Mn ≤1,40 · Cu ≤0,55 - ΔMn 0.05 - ΔCu 0.00 - 30 designations](/materials/din-en/a284d "A284D")[Fe360D2 1.0117 Mn ≤1,40 · Cu ≤0,55 - ΔMn 0.05 - ΔCu 0.00 - 8 designations](/materials/din-en/fe360d2 "Fe360D2") ## 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=80ae889b-6564-4d35-9718-e8b84ee00525&designation=ddf50a7a-9be2-4564-a66b-f95cb4b6e323 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/pn/st4w.pdf "Datasheet as PDF")