Material number · Europe · 41 designations

1.6587

1.6587 is the material number of the grade also listed as 18CrNiMo7-6. It is a material in the category Case hardening steels. We list 41 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, ISO, JIS, GB, GOST, UNI, ČSN, PN, COPANT, SRPS and SFS.

Material no. 1.6587
Category Case hardening steels · 60 grades
Designations 41

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If you came for one of these

The most-used names for this grade.

About Case hardening steels

Case hardening steels are steels designed to develop a hard, wear-resistant surface while retaining a tough and ductile core. They are used for components such as gears, shafts and other machine parts exposed to contact wear and cyclic loading.

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

Also known as

41 designations · 16 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Withdrawndesignation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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 · 4

UNSUnited States · 1

G48200Indicative

AISI / SAEUnited States · 5

BSUnited Kingdom · 6

AFNORFrance · 2

UNESpain · 3

ISOInternational · 1

18CrNiMo7Indicative

JISJapan · 4

GBChina · 1

17Cr2Ni2MoIndicative

GOSTRussia / CIS · 6

UNIItaly · 1

18NiCrMo7Indicative

ČSNCzechia · 2

PNPoland · 2

COPANTLatin America · 1

4820Indicative

SRPSSerbia · 1

Č.4520Indicative

SFSFinland · 1

511Indicative

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

Chemical composition

8 elements on file · weight %

What this alloy is

Iron — the balance, never listed by a standard — 95.2 %Cr — 1.7 %Ni — 1.5 %Mn — 0.7 %Traces & impurities · 0.9 %

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

Element	% by weight
	0.15–0.21
	≤ 0.4
	0.5–0.9
	0.025
	0.035
	1.5–1.8 —
	0.25–0.35
	1.4–1.7

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	0,15-0,21	0.150	0.210	Range
Si	≤0,40	—	0.400	Max
P	0,025	0.025	0.025	Exact
S	0,035	0.035	0.035	Exact
Cr	1,50-1,80	1.500	1.800	Range
Mn	0,50-0,90	0.500	0.900	Range
Ni	1,40-1,70	1.400	1.700	Range
Mo	0,25-0,35	0.250	0.350	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 Ae3789°C

Predicted Ae1737°C

Predicted Acm480°C

Predicted Bs492°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

Density7,77g/cm³Exact

Transformation point Ac1720°CExact

Transformation point Ac3825°CExact · Ac3(Acm)

Weldabilityweldable with restrictionsAs published: limited weldability.

Flake sensitivitysusceptibleAs published: predisposed

Temper brittlenessnot susceptibleAs 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 dimensionQuenching and drawingsource splav

Dimensionmm	RmN/mm²	ReN/mm²	A5%	Z%	KCUkJ/m²
Ø 15	880	685	11	50	780

By delivery stateTreated to improve shearabilitysource steelnumber

Delivery state	HB
Treated to improve shearability	255

By delivery stateSoft annealedsource steelnumber

Delivery state	HB
Soft annealed	229

By delivery stateTreated to hardness rangesource steelnumber

Delivery state	HB
Treated to hardness range	179 – 229

By delivery stateTreated to ferrite-pearlite structure and hardness rangesource steelnumber

Delivery state	HB
Treated to ferrite-pearlite structure and hardness range	159 – 207

At temperatureno delivery state statedsource steelnumber

Temperature°C	RmN/mm²
200	1200

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.

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