Material number · Europe · 9 designations

1.5025

1.5025 is the material number of the grade also listed as 51Si7. It is a material in the category Spring steels. We list 9 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, GOST, PN and SRPS.

Material no. 1.5025
Category Spring steels · 52 grades
Designations 9

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If you came for one of these

The most-used names for this grade.

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

9 designations · 6 standards · nothing hidden

This grade’s own namerecorded in our sources as this grade’s own designation under that standard.

Indicativetaken from a published cross-reference table; a close match, not a guarantee of interchangeability. Verify against the mill certificate before ordering.

Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.

DIN / ENEurope · 1

51Si7This grade’s own name

UNSUnited States · 1

G92550This grade’s own name

AISI / SAEUnited States · 1

9255This grade’s own name

GOSTRussia / CIS · 2

PNPoland · 3

SRPSSerbia · 1

Č.2132Indicative

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

Iron — the balance, never listed by a standard — 97.1 %Si — 1.7 %Mn — 0.7 %C — 0.5 %Traces & impurities · 0.1 %

Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade.

Element	% by weight
	0.47–0.55
	1.5–1.8
	0.5–0.8
	0.045
	0.045
	0.007

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 publishedsource text, verbatim	Min% by weight	Max% by weight	Bound
C	0,47-0,55	0.470	0.550	Range
N	0,007	0.007	0.007	Exact
Si	1,50-1,80	1.500	1.800	Range
P	0,045	0.045	0.045	Exact
S	0,045	0.045	0.045	Exact
Mn	0,50-0,80	0.500	0.800	Range

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

Density7,85g/cm³Exact

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.

Similar grades — and why

Selection rule, stated so you can disagree with it: same number class 1.5, a shared category, and a published range for Si / Mn 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.

38Si71.5023

Si 1,50-1,80 · Mn 0,50-0,80