aisi 4140 mechanical properties high yield aisi 4140 mechanical propertie

1.
Steel Grade
AISI 4140/DIN 1.7225/JIS SCM440/GB 42CrMo
Size & Dimension
Dia:20-120mm L:2000-5800mm
Surface treatment
Black/Peeling/Polishing/Machined
Technique
Cold/Hot rolled, Cold-Drawn or Hot Forged
Heat Treatment
Annealed; Quenched; Tempered
Delivery Condition
Hot Rolled or Forged/Peeled or Black Surface/Annealed or QT
Test
SGS/UT100%/Elements Testing
Certificate
ISO/Mill Certificate
AVAILABLE Steel Type
Round bar/Plate

2.
AISI 4140 alloy steel round bar sheet plate has high fatigue strength and low
notch sensitivity. Low-temperature impact toughness is also very high, no
obvious temper brittleness. It is mainly used after quenching and tempering
state. It is used to manufacture high-strength parts under impact loads and the
fittings with large cross-sections and other stressed members. Such as the
horizontal eccentric shaft of the horizontal forging machine, the crankshaft of
the forging press, and etc. And the equivalent grade for it is DIN 1.7225 and
JIS SCM440. 4140 Steel properties and chemical composition as below.

3.
AVAILABLE SIZE:
Round bar: Diameter(mm) Max 800mm; Length(mm) Max 12000mm.
Plate: Thickness(mm) Max 800mm; Width(mm) Max 2300mm; Length(mm) Max 12000mm.
Condition: Cold rolled(drawn)≤50mm, Hot rolled≤12-250mm, Hot forged≥50mm.
 
AISI 4140/DIN 1.7225 Introduction:
AISI 4140 alloy steel is chromium, molybdenum, manganese containing low alloy
steel. It has high fatigue strength, abrasion and impact resistance, toughness,
and torsional strength.
 
Fabrication and Heat Treatment:
1. Forging
Preheat the steel carefully, then raise the temperature to 1150-1200°C for
forging. Do not forge below 850°C.
2. Annealing
Heat the AISI 4140 slowly to 800-850°C and allow enough time for the steel to
be thoroughly heated. Cool slowly in the furnace to 480°C followed by air
cooling.
3. Stress Relieving
When parts are heavily machined, ground or otherwise subject to cold work,
stress relieving will be beneficial prior to hardening.
4. Hardening
AISI 4140 steel is usually supplied ready heat treated to 18-22HRC. If further
heat treatment is required annealed AISI 4140 should be heated slowly to 840-
875°C and after adequate soaking at this temperature quench in oil. Temper as
soon as the tools reach room temperature.
5. Tempering
Heat the AISI 4140 carefully to a suitable temperature selected by reference to
a tempering chart or table (usually between 550-700°C, soak at the temperature
for 2 hours per 25mm of ruling section, then allow to cool in air. Tempering
between 250-375°C is not advised as tempering within this range will seriously
reduce the impact value.
6. Surface Treatment
Plate: Origin Black, Orign cold rolled bright, Machined, Grinded
Bar: Origin Black, Orign cold rolled(drawn) bright, Turned, Peeled, Grinded

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Province, P.R.C China
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