42CrMo4 Alloy Steel, BS EN 10250 Engineering Steel Page 1 of 4

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BS EN 42crmo4 Alloy Steel is a common chromium-

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molybdenum steel that usually used after quenched and
tempered, with high intensity, high hardenability. BS EN 42CrMo4
 High Speed Steel round steel has better performance than 34CrMo4 steel due to the 11
carbon and chromium content is higher. 42CrMo4 alloy steel has
 Hot Work Steel higher strength and hardenability. The 42CrMo4 alloy material
also has high fatigue strength and good low-temperature impact
 Cold Work Tool toughness. The temper brittleness is not obvious.
Steel

 Plastic Mold Steel

 Engineering Steel

 C45|1045|1.1191|S45C

 4140|1.7225|42CrMo4|SCM440

 4340|1.6511|36CrNiMo4|SNCM439

 8620|1.6523|21NiCrMo2|SNCM220

 4130|1.7218|25CrMo4|SCM430

 4337|1.6582|34CrNiMo6

Although 42CrMo4 steel is more expensive than 41Cr4 steel, it is

 4118|1.7243|18CrMo4|SCM420
more preferable in terms of material properties. EN 42CrMo4 alloy
engineering steel materials have been widely used in automotive
 Stainless Steel driving elements. Otai Steel is able to supply you prime quality of
 440C|1.4125|SUS440C 42CrMo4 alloy steel materials with wide range.

1.42CrMo4 Alloy Steel Supply Range

42CrMo4 Round bar Sizes: 10mm – 3000mm

Select Language  Steel 42CrMo4 Flat and Plate: 10mm-1500mm thickness x 200-
Powered by Translate 3000mm width
Other steel shape and sizes available according to your
requirements.
ISO 9001
Surface condition: Black, rough machined, peeled, turned or
Quality other requirements according to your requirements.
Assurance

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42CrMo4 Alloy Steel, BS EN 10250 Engineering Steel Page 2 of 4

RFQ OF 42CRMO4 STEEL

2.BS EN 42CrMo4 Alloy Steel Relevant Specifications and

Equivalents

BS BS
BS EN Material ASTM JIS AS
DIN 970-3- 970- AFNOR
10250 No. A29 G4105 1444
1991 1955
42CrMo4 1.7225 38HM 4140 SCM440 708M40 EN19A 4140 42CD4
3.42CrMo4 Alloy Steel Chemical Composition 11

C Mn Si P S Cr Mo
42CrMo4/1.7225 0.40 0.035 0.035
0.38-0.45 0.60-0.90 0.90-1.20 0.15-0.30
max max max
4. DIN 42CrMo4 Alloy Steel Mechanical Properties

Ultimate
Size Yield stress Elongation Toughness
tensile Hardness
Ø Rp0.2,N/nn2, A5,%, KV, Joule,
Stress, HB
mm min. min. min.
Rm,N/nn2
1000-
<40 750 11 295-355 35 at 20ºC
1200
40-95 650 900-1100 12 265-325 35 at 20ºC
>95 550 800-950 13 235-295 35 at 20ºC
5. Heat Treatment of 42CrMo4 Steels

Annealing of 42CrMo4 Steels

• Heat steel 42CrMo4 forged steel slowly and thoroughly to

800-850°C;
• Cool slowly in the furnace to the temperature 480°;
• Complete annealing the steel in the air.

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Quenched and Tempered (Q+T)

• Heat 42CrMo4 steel slowly to 880°C;

• Soak at this temperature then quench in oil;
• Temper as soon as 42CrMo4 steel reach room temperature
(20°C);
• Heat uniformly to the suitable temperature of 560°C;
• Withdraw the 42CrMo4 material from the furnace and cool in
the air.

6. Forging of 42CrMo4 Alloy Steel

• Preheat 42CrMo4 engineering steel uniformly and slowly;

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42CrMo4 Alloy Steel, BS EN 10250 Engineering Steel Page 3 of 4

• Increase the forging temperature up to 1150-1200°C.

• Always keep the forging temperature above at least 850°C

7.Weldability

Engineering steel 42CrMo4 has only limited weldability.

Preheating to 200-300°C is strongly recommended; the upper limit
should not be exceeded because of risk for deterioration of the
chrome layer.

Alloy steel 42CrMo4 can be friction welded. However, precautions

are necessary so as to limit the formation of undesirable
microstructures in the welded zone. 11

8.Application of 42CrMo4 Alloy Steels

EN 42CrMo4 alloy steel is widely used for engineering steel

purpose, such as: making various kinds of machinery, automobile,
mining spare part, the gearwheel of the engine, the driving gear of
supercharger, the connecting rob, the pinchock under the high
pressure, parts for power train applications, cold formed fastener
components, shafts, gears, drill collars for the oil exploration, etc.

RFQ OF 42CRMO4 STEEL

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August 12th, 2016 | 0 May 24th, 2016 | 0 Comments

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