Material data sheet Last revised: Tue, 13 Oct 2020 13:25:52 GMT

Steel grade

42CrMo4 All

General Information

42CrMo4 is a steel for quenching and tempering, which has a good combination of strength and toughness in the
quenched and tempered condition. After the oil quenching, the steel will be through hardened up to ø60 mm bar
diameter. The microstructure of larger dimensions is not fully martensite. The steel is applicable to induction
hardening. The surface hardness will exceed min. 53 HRC. 42CrMo4 can be delivered M-treated in order to
optimize the machinability.

Variant 6082 is offered under the name MoC410M

Variant 6137 conform with L7 ASTM A320

Variant SB9288 is offered under the name SB42CrMo4

Variant SB9287 with a slightly increased hardenability, is offered under the name SB42CrMo4.

Variant 327S is a continuous cast variant with slightly increased hardenability, similar to the ingot casted variant
327A

Variant 327A is an ingot cast variant with slightly increased hardenability.

Variant 326C is a BQ-steel variant which fulfils SAE 4140 standard but has a restricted sulphur content for
improved cleanliness and a lower maximum allowed phosphorus content for improved mechanical properties

BQ-Steel®
BQ-steel® is a bearing quality clean steel optimized for fatigue strength and is also ideal for new design solutions outside the
bearing industry.

For additional Heat Treatment Data, please visit the Heat Treatment Guide.

Similar designations
AISI 4140, 42CD4(AFNOR), 708M40(B.S.), SS 2244, SS142244, SAE 4140H, ASTM A193 B7, 41Cr4,
42CrMoS4
Chemical composition
Variant Cast Di Weldability C % Si % Mn % P % S% Cr % Ni % Mo % V % Cu % Al % B % DI %
42CrMo4 M CEV 0.82max Min 0.38 0.15 0.60 - 0.020 0.90 - 0.15 - - - - -
(6082), MoC CC 5.6
410 M Pcm 0.55max Max 0.45 0.40 0.90 0.025 0.035 1.20 - 0.30 - - - - -

L7 ASTM CEV 0.86max Min 0.38 0.15 0.75 - - 0.90 - 0.15 - - - - -

CC 6.39
A320 (6137) Pcm 0.585max Max 0.45 0.35 0.90 0.025 0.025 1.10 - 0.25 - - - 0.0030 -
CEV 0.8max Min 0.40 0.15 0.75 - 0.020 0.90 - 0.15 - - 0.015 - -
SB 9288 CC 4.9
Pcm 0.57max Max 0.43 0.25 0.90 0.025 0.035 1.10 0.30 0.25 - 0.25 0.040 - -
CEV max Min 0.41 0.20 0.65 - 0.020 1.00 0.15 0.22 - - 0.020 - -
327S CC
Pcm max Max 0.45 0.35 0.80 0.025 0.030 1.20 0.30 0.28 0.040 - 0.035 - -
CEV 0.92max Min 0.41 0.20 0.65 - 0.020 1.00 0.15 0.22 - - - - 5.60
327A IC
Pcm 0.6max Max 0.45 0.35 0.80 0.025 0.030 1.20 0.30 0.28 - - - - 8.30
CEV 0.9max Min 0.38 0.20 0.80 - 0.005 0.90 - 0.15 - - - - -
326C IC
Pcm 0.58max Max 0.43 0.30 1.00 0.015 0.010 1.10 0.20 0.25 - - - - -
42CrMo4 EN CEV max Min 0.38 0.10 0.60 0.000 0.000 0.90 - 0.15 - 0.00 - - -
Std
ISO 683-2 Pcm max Max 0.45 0.40 0.90 0.025 0.035 1.20 - 0.30 - 0.40 - - -
Mechanical Properties
Tensile Impact
Dimension Yield strength Elongation Reduction of
Variant Condition Format strength Hardness (ISO-V)
[mm] min [MPa] A5 [%] area Zmin [%]
[MPa] strengthmin
Round
+AR 25 < 160 - - - - 350 HB typical -
bar
Round
+A 25 < 160 - - - - 241 HB typical -
bar
42CrMo4 M
Round 20 °C 35 J
(6082), MoC 410 25 < 40 750** 1000-1200 11 45 300-350 HB
bar (long)
M
Round 20 °C 35 J
+QT 40 < 100 650** 900-1100 12 50 270-320 HB
bar (long)
Round 20 °C 35 J
100 < 160 550** 800-950 13 50 240-280 HB
bar (long)
Round
+AR 22 < 160 - - - - < 340 HB -
bar
L7 ASTM A320 Round
+A 22 < 160 - - - - < 241 HB -
(6137) bar
Round -101 °C 27
+QT 22 < 90 725 860-1070 16 50 260-321 HB
bar J (long)
Round
SB 9288 +QT 15 < 64 940** 1050-1140 9 - - -
bar
Round
+AR 24 < 190 - - - - 350 HB typical -
bar
Round
+A 24 < 190 - - - - 241 HB typical -
bar
Round 20 °C 35 J
25 < 40 750** 1000-1200 11 45 300-350 HB
bar (long)
327A
Round 20 °C 35 J
40 < 100 650** 900-1100 12 50 270-320 HB
bar (long)
+QT
Round 20 °C 35 J
100 < 160 550** 800-950 13 50 240-280 HB
bar (long)
Round 20 °C 35 J
160 < 180 500** 750-900 14 55 220-270 HB
bar (long)
Round
+A 25 < 180 - - - - 200 HB typical -
bar
326C
Round
+QT 25 < 180 600 700-1050 17 65 230-330 HB -
bar
Rp0.2 * Reh, ** Rel
*708M40(1983) Format (condition QT) Dim<150mm corresponds to R condition; Dim<100mm to S condition;
Dim<63mm to T condition; Dim<29mm to U condition

** SS142244 (1986) Format (condition QT) Dim<160mm corresponds to SS2244-04; Dim<100 mm to SS2244-
05; Dim<25 mm corresponds to SS2244-06; format all Dim(condition A) corresponds to SS2244-02

Transformation temperatures
Temperature °C
MS 320
AC1 740
AC3 770
Heat treatment recommendations
Treatment Condition Temperature cycle Cooling/quenching
850-1050°C In air
Hot forging +U

680-720°C Slowly ( 15°C/h) until 600°C

Soft annealing +A

450-650°C In air
Stress relieve annealing +SRA

840-880°C In oil or water. Temper in 540-680°C

Quench & Tempering +QT

150-180°C ( after Induction Hardening ) In air

Stress relieve annealing +SRA
Hardenability

Other properties (typical values)

Youngs module (GPa) Poisson´s ratio (-) Shear module (GPa) Density (kg/m3)
210 0.3 80 7800
Average CTE 20-300°C Specific heat Thermal conductivity Ambient Electrical resistivityAmbient
(µm/m°K) capacity 50/100°C (J/kg°K) temperature (W/m°K) temperature (µΩm)
12 460 - 480 40 - 45 0.20 - 0.25

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Disclaimer
The information in this document is for illustrative purposes only. The data and examples are only general recommendations and not a
warranty or a guarantee. The suitability of a product for a specific application can be confirmed only by Ovako once given the actual
conditions.The purchaser of an Ovako product has the responsibility to ascertain and control the applicability of the products before
using them. Continuous development may necessitate changes in technical data without notice. This document is only valid for Ovako
material. Other material, covering the same international specifications, does not necessarily comply with the properties presented in
this document.