EN19

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709M40

(En19)

Applications

Its typical uses are axle shafts, crankshafts, connecting rods, gears, high tensile bolts and studs, propeller shafts joints, rifle barrels and breech mechanisms for small arms parts, introduction hardened trackpins.

Forgeability

Good

Heat Treatment Ability

Very Versatile

Machineability

Difficult

Weldability

Not recommended

 

Chemical Composition

Element Min Max
Carbon 0.36 0.44
Silicon 0.10 0.35
Manganese 0.70 1.00
Phosphorous - 0.04
Sulphur - 0.04
Chromium 0.90 1.20
Molybdenum 0.25 0.35

 

Mechanical Properties

  Condition
  R S T U V
Limited Ruling Section, mm 254 152 102 64 29
Tensile Strength, MPa min. 690/850 770/930 850/1000 930/1080 1000/1160
Yield Stress; MPa min. 480 570 665 740 835
Elongation, % min. 15 15 13 12 12
Izod Impact Value; Joule 34 54 54 47.5 47.5
Brinnel Hardness Number 201/255 223/277 248/302 269/331 293/352

 

Foreign Equivalent Specifications

Standard German Mat. No. Din SAE AISI JIS

1.7225

GS-42rM04 4140H 4140H G4042

Type: SCM4H

 

Stock Size Range

(Round Black Bar)

20 2.466 kg/m 80 39.458 kg/m
25 3.853 kg/m 85 44.545 kg/m
30 5.549 kg/m 90 49.939 kg/m
35 7.553 kg/m 95 55.642 kg/m
40 9.865 kg/m 100 61.654 kg/m
45 12.485 kg/m 110 74.536 kg/m
50 15.413 kg/m 115 81.537 kg/m
55 18.650 kg/m 120 88.781 kg/m
60 22.195 kg/m 130 104.195 kg/m
65 26.049 kg/m 140 120.841 kg/m
70 30.210 kg/m 150 138.721 kg/m
75 34.680 kg/m 160 157.833 kg/m

 

Larger sizes and forgings are also available and please

remember to allow for surface removal of + 6% to ensure cleanup.

Catalogues & Brochures

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