Material number · Europe · 1 designation

1.8770

1.8770 is the material number of the grade also listed as S800QL. It is a material in the category High-strength steels. We list 1 designations recorded for this grade, in the standards DIN / EN.

Material no. 1.8770
Category High-strength steels · 128 grades
Designations 1

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If you came for one of these

The most-used names for this grade.

DIN / ENS800QLThis grade’s own name

About High-strength steels

High-strength steels are steels designed to carry high loads while resisting deformation. They are used for load-bearing structures, vehicles and machinery where strength, durability and reduced material weight are important.

This describes the material class as a whole. Always confirm the individual grade against the standard before ordering.

Also known as

1 designations · 1 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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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

S800QLThis grade’s own name

Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.

Chemical composition

12 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 93 %Ni — 2 %Mn — 1.6 %Cr — 1.5 %Traces & impurities · 1.9 %

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

Element	% by weight
	≤ 0.2
	≤ 0.8
	≤ 1.6
	0.02
	0.01
	≤ 1.5
	≤ 0.6
	2
	≤ 0.12
	≤ 0.05
	≤ 0.06
	≤ 0.005

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
B	≤0,0050	—	0.005	Max
C	≤0,20	—	0.200	Max
Si	≤0,80	—	0.800	Max
P	0,02	0.020	0.020	Exact
S	0,01	0.010	0.010	Exact
Ti	≤0,05	—	0.050	Max
V	≤0,12	—	0.120	Max
Cr	≤1,50	—	1.500	Max
Mn	≤1,60	—	1.600	Max
Ni	2	2.000	2.000	Exact
Nb	≤0,06	—	0.060	Max
Mo	≤0,60	—	0.600	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

computed from composition · °C

Predicted Ae3794°C

Predicted Ae1724°C

Predicted Acm474°C

Predicted Bs464°C

These four temperatures are a CALCULATION from this grade's own composition, using the published Li, Niebuhr, Meekisho & Atteridge (1998) model — never a measurement, and computed from the UPPER BOUND of each element's specified range, not a mid-range figure. Where this grade also has a measured transformation point (Ac1, Ac3, Ar1, Ar3) on file, it is shown separately, in Physical & mechanical properties, and is never replaced by the predicted figures here — Ae (predicted, equilibrium) and Ac/Ar (measured, on heating or cooling) are different physical quantities and can differ by tens of degrees; a mismatch between the two is not an error in either.

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 1.8, a shared category, and a published range for Ni / 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.

S890QL11.8925

Ni 2 · Mn ≤1,70