DIN / EN · Europe · 1 designation

S790QL

S790QL is a material in the category High-strength steels, held under material number 1.8795. Its recorded composition includes C 0.12–0.18%, Si 0.2–0.5%, Cr ≤ 0.8%, Mn 1.2–1.7% and W 0.1–0.7%. No cross-standard equivalents are recorded for this grade yet. Its recorded density is 7.85 g/cm³.

Material no. 1.8795
Category High-strength steels · 128 grades
Designations 1

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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.

Chemical composition

15 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 95.6 %Mn — 1.5 %Cr — 0.8 %Ni — 0.4 %Traces & impurities · 1.8 %

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

Element	% by weight
	0.12–0.18
	0.2–0.5
	1.2–1.7
	0.025
	0.015
	≤ 0.8
	0.2–0.5
	0.4
	0.05–0.12
	0.1–0.7
	≤ 0.25
	0.015–0.05
	≤ 0.05
	≤ 0.05
	0.02

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	0,12-0,18	0.120	0.180	Range
N	0,02	0.020	0.020	Exact
Al	0,015-0,050	0.015	0.050	Range
Si	0,20-0,50	0.200	0.500	Range
P	0,025	0.025	0.025	Exact
S	0,015	0.015	0.015	Exact
Ti	≤0,05	—	0.050	Max
V	0,05-0,12	0.050	0.120	Range
Cr	≤0,80	—	0.800	Max
Mn	1,20-1,70	1.200	1.700	Range
Ni	0,4	0.400	0.400	Exact
Cu	≤0,25	—	0.250	Max
Nb	≤0,05	—	0.050	Max
Mo	0,20-0,50	0.200	0.500	Range
W	0,10-0,70	0.100	0.700	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

computed from composition · °C

Predicted Ae3812°C

Predicted Ae1723°C

Predicted Acm444°C

Predicted Bs513°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 Mn / 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.

20MnCrNiMo6-31.8708

Mn 1,30-1,55 · Cr 0,60-0,75