AISI 4140 Steel Round Bar Sheet Plate, JIS SCM440, DIN 1.7225

What is AISI 4140 Steel?
AISI 4140 alloy steel round bar sheet plate belongs to medium hardenability
steel.AISI 4140 steel has high fatigue strength and low notch sensitivity. Low-
temperature impact toughness is also very high, no obvious temper brittleness.
AISI 4140 steel round bar 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.

ASTM 4140 Steel Application
4140 steel is medium hardenability steel with good strength and good
comprehensive mechanical properties after heat treatment. It has good
manufacturability. The maximum temperature of use is 427 °C. It can be used to
make turbine fastener, tool bodies, forming dies, brake dies and etc. And it
also as the material of Oil deep well drill pipe joints and fishing tools below
2000m.

AISI 4140 Steel Characteristics
1.It is low alloy steel with chromium, molybdenum, and manganese.
2.Great toughness, fatigue strength, abrasion and impact resistance.
3.It is widely be used in the industry due to its excellent versatility and
usefulness.
4.The higher carbon content in it, the higher the strength and heat treatment
capabilities it is.
5.It can be oil hardened to relatively high hardenability.

Test
How is SAE 4140 steel tested?

Our AISI 4140 steel round bar and steel plate composition detection is carried
out by a spectrometer, which is fast, accurate and efficient in detection;
hardness is tested by a hardness tester,
The hardness tester is based on the Leeb hardness measurement principle, which
can easily and quickly measure a variety of metal materials. While displaying
the hardness measurement value immediately, it can be freely converted between
different hardness scales, and the tolerance limit can be set in advance, and
it will automatically alarm when it exceeds the range.
1. Measuring range: (170-960)HLD,(17-68.5)HRC,(19-651)HB,(80-976)HV,(3 , 0-100)HS,
(59-85)HRA(13-100 )HRB
2. Measurement direction: support 360° (vertical down, oblique down,
horizontal, oblique up, vertical up)
3. Hardness scale: Richter (HL), Brinell (HB), Rockwell B (HRB), Rockwell C
(HRC), Rockwell A (HRA), Vickers (HV), Shore (HS)
4. Display: quarter dot matrix LCD
5. Data storage: maximum 500 groups (impact times 32 to 1)
6. Working voltage: 3V (2 AA size alkaline batteries connected in series)
7. Continuous working time: about 100 hours (when the backlight is not turned
on)

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Minimum Order: 1 tons

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