--- title: "SUP12 — Spring steels" description: "SUP12 in JIS: material number 1.7102, also listed as 54SiCr6. It is a material in the category Spring steels. 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Compare it to detect a real > content change; `generated` moves on every render and is not a change signal. JIS · Japan · 32 designations # SUP12 SUP12 is a designation in JIS for the material held under material number 1.7102, also listed as 54SiCr6. It is a material in the category Spring steels. We list 32 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, ISO, JIS, GB, GOST, UNI, SS, ČSN, PN, STAS and BDS. - [*Material no.* **1.7102**](/materials/material-no/1.7102 "Material no.: 1.7102") - [*Category* **Spring steels · 52 grades**](/categories/spring-steels "Category: Spring steels · 52 grades") - *Designations* **32** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=b85b066b-cb76-49ae-b036-e4adc91b1a44&designation=a6c9385c-64cd-4f19-abb0-903631d0c2c5 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/sup12.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 54SiCr6 This grade’s own name](/materials/din-en/54sicr6 "DIN / EN 54SiCr6") - [UNS G92540 This grade’s own name · 3 grades on that route](/materials/uns/g92540 "UNS G92540") - [AISI / SAE 9254 This grade’s own name · 2 grades on that route](/materials/aisi-sae/9254 "AISI / SAE 9254") - [BS EN48A This grade’s own name](/materials/bs/en48a "BS EN48A") ## About Spring steels Spring steels are alloy steels designed to store and release elastic energy repeatedly without permanent deformation. They are characterised by a combination of strength, hardness and resilience, making them suitable for springs, clips, washers and other components subjected to repeated flexing or shock. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 32 designations · 15 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 Withdrawn designation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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 - [54SiCr6 This grade’s own name](/materials/din-en/54sicr6 "DIN / EN 54SiCr6") UNS United States · 2 - [G92540 This grade’s own name](/materials/uns/g92540 "UNS G92540") - [K15590 This grade’s own name](/materials/uns/k15590 "UNS K15590") AISI / SAE United States · 4 - [9254 This grade’s own name](/materials/aisi-sae/9254 "AISI / SAE 9254") - [9260 Indicative](/materials/aisi-sae/9260 "AISI / SAE 9260") - [G92540 Indicative](/materials/uns/g92540 "AISI / SAE G92540") - [J157 This grade’s own name](/materials/aisi-sae/j157 "AISI / SAE J157") BS United Kingdom · 3 - [250A61 Indicative](/materials/bs/250a61 "BS 250A61") - [685H57 Indicative](/materials/bs/685h57 "BS 685H57") - [EN48A This grade’s own name](/materials/bs/en48a "BS EN48A") AFNOR France · 3 - [54SiCr6 Indicative](/materials/din-en/54sicr6 "AFNOR 54SiCr6") - [60SC7 Indicative](/materials/afnor/60sc7 "AFNOR 60SC7") - [61SC7 Indicative](/materials/afnor/61sc7 "AFNOR 61SC7") ISO International · 1 - [55SiCr63 Indicative](/materials/din-en/55sicr6-3 "ISO 55SiCr63") JIS Japan · 2 - **SUP12 Indicative** - [SUP7 Indicative](/materials/jis/sup7 "JIS SUP7") GB China · 1 - [60Si2CrA Indicative](/materials/gb/60si2cra "GB 60Si2CrA") GOST Russia / CIS · 3 - [50S2 Indicative](/materials/gost/50s2 "GOST 50S2") - [60S2KH Indicative](/materials/gost/60s2kh "GOST 60S2KH") - [60С2ХА Indicative](/materials/gost/60s2kha "GOST 60С2ХА") UNI Italy · 2 - [48Si7 Indicative](/materials/din-en/48si7 "UNI 48Si7") - [60SiCr8 Indicative](/materials/une/60sicr8 "UNI 60SiCr8") SS Sweden · 1 - [2090 Indicative](/materials/ss/2090 "SS 2090") ČSN Czechia · 4 - [13251 Indicative](/materials/csn/13251 "ČSN 13251") - [13270 Indicative](/materials/csn/13270 "ČSN 13270") - [14240 Indicative](/materials/csn/14240 "ČSN 14240") - [14260 Indicative](/materials/csn/14260 "ČSN 14260") PN Poland · 2 - [60S2 Indicative](/materials/gost/60s2 "PN 60S2") - [60S2A Indicative](/materials/gost/60s2a "PN 60S2A") STAS Romania · 1 - [60Si15A Indicative](/materials/stas/60si15a "STAS 60Si15A") BDS Bulgaria · 2 - [60S2A Indicative](/materials/gost/60s2a "BDS 60S2A") - [60S2ChA Indicative](/materials/bds/60s2cha "BDS 60S2ChA") 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 Si Mn Cr Iron — the balance, never listed by a standard — 96.7 % Si — 1.4 % Mn — 0.7 % Cr — 0.7 % Traces & impurities · 0.6 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.51–0.59 | | Si | 1.2–1.6 | | Mn | 0.5–0.8 | | P | 0.025 | | S | 0.025 | | Cr | 0.5–0.8 | Carbon Silicon Manganese Phosphorus Sulfur Chromium 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 | 0,51-0,59 | 0.510 | 0.590 | Range | | Si | 1,20-1,60 | 1.200 | 1.600 | Range | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,025 | 0.025 | 0.025 | Exact | | Cr | 0,50-0,80 | 0.500 | 0.800 | Range | | Mn | 0,50-0,80 | 0.500 | 0.800 | Range | - Cu+10Sn±0,60 - Cu+10Sn±0,60 - Cu+10Sn±0,60 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, Mo. ## Physical & mechanical properties Density 7,46 g/cm³ Exact Transformation point Ac1 765 °C Exact Transformation point Ac3 780 °C Exact · Ac3(Acm) Transformation point Ar1 700 °C Exact Weldability not suitable for welding As published: is not used. 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 6 conditions · 10 values By delivery state**no delivery state stated** source `splav` | Delivery state | HB | |---|---| | (without heat treatment) , GOST 14959-79 | 321 | | (heat treatment) , Rolled stock GOST 14959-79 | 285 | By delivery state**Treated to improve shearability** source `steelnumber` | Delivery state | HB | |---|---| | Treated to improve shearability | 280 | By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 248 | By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | Re N/mm² | A5% | Z% | |---|---|---|---|---| | Steel, GOST 14959-79 | 1470 | 1325 | 6 | 25 | By delivery state**Annealed to achieve spheroidization of the carbides** source `steelnumber` | Delivery state | HB | |---|---| | Annealed to achieve spheroidization of the carbides | 230 | At temperature**no delivery state stated** source `splav` | Temperature °C | Elastic modulus GPa | |---|---| | 20 | 196 | 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 1.7, a shared category, and a published range for Si / Cr 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. [55SiCr6-3 1.7104 Si 1,20-1,60 · Cr 0,50-0,80 - ΔSi 0.00 - ΔCr 0.00 - 4 designations](/materials/din-en/55sicr6-3 "55SiCr6-3")[67SiCr5 1.7103 Si 1,20-1,40 · Cr 0,40-0,60 - ΔSi 0.10 - ΔCr 0.15 - 2 designations](/materials/din-en/67sicr5 "67SiCr5") ## 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=b85b066b-cb76-49ae-b036-e4adc91b1a44&designation=a6c9385c-64cd-4f19-abb0-903631d0c2c5 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/sup12.pdf "Datasheet as PDF")