GENERAL SCOPE

4140 is a low alloy steel that is commonly used in downhole tools and usually supplied in the hardened and tempered condition at 22 HRC max.

CHEMICAL COMPOSITION

 

C

Si

Mn

P

S

Cr

Mo

Ni

Al

Cu

Sn

Min

0.38

0.15

0.75

 

 

0.8

0.15

 

 

Max

0.43

0.35

1.0

0.025

0.025

1.1

0.25

0.25

0.035

0.25

0.1

MECHANICAL PROPERTIES

Tensile

Result

RP 0.2%

80,000 PSI MIN

RM

100,000 PSI MIN

Elongation

18%

Reduction of area

35%

HBW10/3000

217-235

KCV @ -46 DEG C

27J min Ave, 20J min single

 

SURFACE CONDITION                                               Black Rolled /Peeled / Smooth Turned Bar.

REDUCTION RATIO                                                     4:1 Min

STRUCTURE                                                                  Grain size will be ASTM 5 or finer.

ULTRASONIC EXAMINATION                                Ultrasonic examination available per ASTM A388/API6A Latest Edition

STOCK RANGE         

Rolled Bar                                                                        Quenched and Tempered                                                               25mm – 280mm ⌀

Forged Bar                                                                      Annealed condition suitable to quench and temper.       250mm – 635mm ⌀