MATERIAL DESCRIPTION

AISI 4140 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.

CHEMICAL COMPOSITION

WEIGHT% C SI MN CR MO S P
MIN.  0,38  0,15  0,75  0,90  0,15
MAX.  0,43  0,35  1,00  1,20  0,35  0,025  0,025

Product Standards: ASTM A29 (4140), EN 10083 – 1, 42CrMo4, API 6A
Approvals: NACE MR0175/ 22HRC

APPLICATIONS

AISI 4140 modified is a low alloy hardened and tempered steel suitable for the manufacture of oil and gas downhole tools used in production and completion processes. General Engineering applications include construction components exposed to heavy strain, such as shafts, gear, bolts etc. AISI 4140 can also be used in hardened condition as machine parts exposed to heavy wear.

Mechanical Properties

YIELD STRENGTH
RP0.2
MPA
TENSILE STRENGTH
RM
MPA
ELONGATION
[%]
HARDNESS
[HB]
IMPACT
CHARPY-V, -46ºC
[J]
 551-665  ≥ 690  ≥ 20  217-235  ≥ 27

Heat Treatment

Hardened at 850°C followed by water quenching. Tempering at min. 650°C, cooled in air.

Weldability

Moderate, can be welded.

AISI 4140 MODIFIED Q&T 217/235 BHN YIELD 80KSI MIN ROUND BAR

DIAMETER DIAMETER
1″ 6.5″
1,5″ 6.75″
1.75″ 7″
1.875″ 7.5″
2″ 8″
2.5″ 8.25″
80mm 8.5″
3.5″ 9″
3.75″ 9.5″
4″ 10″
105 mm 11″
110 mm 12.25″
115 mm 13″
4.75″ 14.375″
5″ 16″
5.25″ 18″
6″ 20″
155 mm
160 mm

AISI 4140 MODIFIED Q&T 217/235 BHN YIELD 80KSI MIN HOLLOW BORED BAR

DIAMETER
5″ OD x 2.25″ ID
5″ OD x 3″ ID
6.5″ OD x 4.5″ ID
7″ OD x 2.25″ ID
7″ OD x 3″ ID
7″ OD x 4″ ID
7.5″ OD x 3″ ID
8″ OD x 2.25″ ID
8″ OD x 2.5″ ID
8″ OD x 3″ ID
8.5″ OD x 3.5″ ID
8.5″ OD x 5.5″ ID
9.5″ OD x 3″ ID
10″ OD x 3″ ID
12″ OD x 3″ ID
12.25″ OD x 3″ ID
12.25″ OD x 8″ ID
15″ OD x 12″ ID