4140 Steel

High Tensile Steel, AISI 4140, SCM440, 42CrMo4, ASSAB 709, 7225, EN19, SCM4

AISI 4140 Steel Bar, Steel Plate, Block Supplier, Stockist and Exporter. steel AISI 4140QT is a 1% chromium molybdenum medium hardenability general purpose high tensile steel , generally  supplied hardened and tempered in the tensile range of 850 – 1000 Mpa (condition QT).

Description

High Tensile Steel, AISI 4140, SCM440, 42CrMo4, ASSAB 709, 7225, EN19, SCM4
AISI 4140 is now available with improved machinability, which greatly increases feeds and/or speeds, while also extending tool life without adversley affecting mechanical properties.

Pre hardened and tempered steel 4140 can be further surface hardened by flame or induction hardening and by nitriding.

1.7225 is used extensively in most industry sectors for a wide range of applications such as:
Adapters, Arbors, Axle Shafts, Bolts, Crankshafts, Connection Rods, Chuck Bodies, Collets, Conveyor Pins & Rolls, Ejector Pins, Forks, Gears, Guide Rods, Hydraulic Shafts & Parts,Lathe Spindles, Logging Parts, Milling Spindles, Motor Shafts, Nuts, Pinch Bars, Pins Various, Pinions, Pump Shafts, Rams, Sockets, Spindles, Sprockets, Studs, Tool Holders, Torsion Bars, Worms etc..

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DIN AISI JIS                                                           Chemical Composition
C Si Mn P S Co Cr Mo Ni V W Cu
42CrMo4 4140H SCM 440H 0.37 to 0.44 0.15 to 0.35 0.65 to 1.10 < 0.04 < 0.03 0.75 to 1.20 0.15 to 1.25 < 0.25 < 0.35

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equivalent of 4140 Steel Specifications

Country USA German British Japan China Australia
Standard ASTM A29 DIN 17200 BS 970 JIS G4105 GB/T 3077 AS 1444
Grades AISI 4140 1.7225/ 42crmo4 42CrMo4 SCM440 42CrMo 4140

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What is hardness of 4140 ?

Section mm 0.2% Proof Stress MPa Tensile Strength MPa Elongation on 5.65√So

%

Impact Izod Charpy

J          J

Hardness HB
*up to 63 680 n 850 – 1000 14 –           – 248 – 302
*up to 100 665 min 850 – 1000 15 54min 50min 248 – 302

*Applies only to bars bright drawn after hardening and tempering

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 TYPICAL MECHANICAL PROPERTIES – Hardened and tempered in section size listed

Section mm Yield Strength MPa Tensile Strength MPa Elongation

%

Impact Izod J Hardness HB
50 770 930 17 90 275
100 710 920 15 70 270
200 570 850 14 60 250

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Typical Mechanical Properties for guidance only

What type of steel is 4140?
AISI 4140 steel is a low alloy steel containing chromium, molybdenum, and manganese. It is widely used across numerous industries
and is an excellent material choice due to its toughness, high fatigue strength, and abrasion and impact resistance.
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Is 4130 or 4140 steel stronger?
Both are medium-carbon (0.30-0.60 % carbon) low-alloy steels. 4140 is similar in composition to 4130 except for the higher carbon content. … Because of its higher carbon content, 4140 steel has greater hardenability and strength than does 4130.
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Can you Carburized 4140?
If you want the part carburized to your spec, then the suggestion of 8620 by arunmrao is a good oneIf you want the part induction hardened and tempered to your spec, then 4140 would be ok. I would limit the hardness to be under 60 HRC if it is 4140,
but 55-62 HRC is fine for carburized 8620.