4340 Alloy Steel

4340 is a 1.8% nickel – chromium – molybdenum high hardenability high tensile steel

SKU: 4340 High Tensile Steel Category: Tags: , ,

Description

4340 High Tensile Steel

4340 is a 1.8% nickel Рchromium Рmolybdenum high hardenability high tensile steel Рgenerally  supplied hardened and tempered in the tensile range of 930 Р1080 Mpa (condition U) Р(Rc 28 Р36). Characterised by high strength and toughness in relatively large sections. Pre hardened and tempered 4340 can be further surface hardened by flame or induction hardeningand by nitriding. 4340 is used in most industry sectors for applications requiring higher tensile/yield strength than4140 can provide.

Typical applications are: Heavy Duty Shafts, Gears, Axles, Spindles, Couplings, Pins etc.

 

DIN

AISI

JIS

Chemical Composition

C

Si

Mn

P

S

Co

Cr

Mo

Ni

V

W

Cu

40NiCr4Mo6

4340H

SCM 439H

0.37 to 0.44

0.15 to 0.35

0.55 to 0.90

< 0.04

< 0.03

0.65 to 0.95

0.20 to 0.30

1.55 to 2.00

< 0.35