EN 10083-3:2006 42CrMo4 Hofors designation 327A Imatra designation MoC410 M 42CrMo4 Smedjebacken designation 42CrMo4

PRODUCT SPECIFICATION Page 1(3)

General 42CrMo4 is a steel for quenching and tempering, which has a good combination of strength and toughness in the quenched and tempered condition. After oil quenching it will be through hardened up to Ø60 mm bar diameter. The micro structure of bigger 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 optimise the machinabilty. Standard This product specification is based on EN 10083-3:2006 and the steel will meet the requirements of this standard. The steel can also be delivered according to following European Standards:

▪ EN 10250-3 Open die steel forgings for general engineering purposes. Part 3: Special alloy steels ▪ EN 10263-4 Steel rod, bars and wire for cold heading and cold extrusion ▪ EN 10269 Steels for fasteners with specified elevated and/or low temperatures properties ▪ EN 10277-5 Bright steel products. Steels for quenching and tempering ▪ EN 10297 Seamless circular steel tubes for mechanical and general engineering purposes ▪ EN 10305 Seamless cold drawn tubes for precision applications ▪ prEN 10343 Steels for quenching and tempering for construction purposes

Chemical composition C% Si% Mn% P% S% Cr% Mo% min. 0,38 0,15 0,60 0,90 0,15 max. 0,45 0,40 0,90 0,025 0,035 1,20 0,30

Mechanical properties Impact strength

KV min. Condition

Bar diameter

Ø mm

Yield strength Re min.

MPa

Tensile strength

Rm MPa

Elon-gationA5 min.

%

Reduction of area Z

min. % J T °C

Hardness HBW

As rolled 25...180 ...350a Annealed ...241

25...40 750 1000...1200 11 45 35 20 300...350a >40...100 650 900...1100 12 50 35 20 270...320a

>100...160 550 800…950 13 50 35 20 240...280a

Quenched and tempered

>160…180 500 750...900 14 55 35 20 220…270a

aInformative

EN 10083-3:2006 42CrMo4 Hofors designation 327A Imatra designation MoC410 M 42CrMo4 Smedjebacken designation 42CrMo4

PRODUCT SPECIFICATION Page 2(3)

Reference data for guidance Heat treatment

Temperature °C Cooling Hot forming 1 050...850 In air Annealing 680…720 Slowly (15°C/h) until 600°C Stress relievingb 450...650 In air Hardening 840…880 Quenching in oil or in water Tempering 540...680 In air Stress relieving after induction hardening 150…180 In air

bThe temperature of stress relieving must chosen approx. 50°C below the tempering temperature. Welding The steel has a restrictive weldability. For instructions regarding filler metals, working temperature and post heat treatments please contact to our technical customers service.

Tempering diagram

Rm Tensile strength, MPa Rp0,2 0,2% proof stress MPa A5 Elongation, gauge 5×d, % HRC Rockwell hardness KV Impact strength with ISO-V test bar at +20°C, J

0

200

400

600

800

1000

1200

1400

400 450 500 550 600 650 700Tempering temperature °C

MPa

0

10

20

30

40

50

60

70

80

90

100J, %, HRC

HBW

400 300

500

200

The values are informative. They are based on oil quenching with a Ø60 mm probe.

EN 10083-3:2006 42CrMo4 Hofors designation 327A Imatra designation MoC410 M 42CrMo4 Smedjebacken designation 42CrMo4

PRODUCT SPECIFICATION Page 3(3)

Hardenability The hardenability will be calculated from the actual analysis according to Ovako formula JoD. If agreed at the time of enquiry and order, the hardenability can be verified with a end quench test.

20 25 30 35 40 45 50 55 60 65

0 10 20 30 40 50

Distance from the quenched end, mm

HRC 20 40 60 75 90 100 Bar diameter, mm

(oil quenching)

HH

HL

The hardenability of 42CrMo4 varies within the limits of the scatter band. Quenched from 850 °C. The hardness of an oil quenched piece (at 1/3 radius) can be estimated using the bar diameter scale of the diagram.

Minimum proof stress Rp0,2 (MPa) at elevated temperatures

°C Condition Bar diameter

Ø mm

50 100 150 200 250 300 350 400 450 500 +QT 25...60 720 702 677 640 602 562 518 475 420 375

The table is based on EN 10269 +A1. Minimum impact energy (J) at low temperature with ISO-V test pieces

°C Condition Bar diameter

Ø mm

-100 -50 -40 -20 0 +20 +QT 25...60 27 40 50

The table is based on EN 10269 +A1.

Disclaimer This specification is for information purposes only. Ovako takes no responsibility for the suitability of the steels referred to in this specification to a given product or end use. We reserve the right to change or correct the data in this specification without prior notification. Ovako takes no responsibility for any errors in this information, or for any consequences resulting from its use