MATERIAL DESCRIPTION

AISI 4145H is a chromium – molybdenum low alloy tempered steel. It has improved hardenability and is more is commonly used in the high strength condition with min.110 KSI yield.

CHEMICAL COMPOSITION

WEIGHT% C SI MN CR MO S P
MIN.  0,43  0,15  0,75  0,80  0,15
MAX.  0,48  0,35  1,00  1,10  0,35  0,025  0,025

Approvals: API 7-1, NS1

APPLICATIONS

AISI 4145H is a low alloy steel suitable for downhole drilling tools such as subs, x-overs, drill collars, pup-joints and fishing tools. General engineering applications include components exposed to heavy strain, such as shafts, gear, bolts etc. AISI 4145H can also be used in hardened condition as machine parts exposed to heavy wear.

Mechanical Properties: BAR

YIELD STRENGTH
RP0.2
MPA
TENSILE STRENGTH
RM
MPA
ELONGATION
[%]
HARDNESS
[HB]
IMPACT
CHARPY-V, -20ºC
[J]
100 KSI, MIN.  689  896  20  233
 MAX.  1000
 110 KSI, MIN.  758  965  14,5  285  ≥ 27
 MAX.  1068  341

Heat Treatment

Hardened and tempered.

Weldability

Poor, can be welded.

AISI 4145H MOD Q&T 285/341BHN YLD 120 KSI MIN ROUND BAR

DIAMETER DIAMETER
1.5″ 7″
1.75″ 180mm
1.875″ 7.5″
2″ 8″
3″
2.5″ 8.25″
80 mm 8.5″
85 mm 220 mm
3.5″ 9″
95 mm 9.5″
4″
105 mm 10″
115 mm 11″
4.75″ 12.25″
5″ 13″
5.25″ 14.375″
5.5″ 15″
6″
155 mm 16″
6.25″ 17″
6.5″ 18″
6.75″ 20″

* AISI 4145H mod NS1 through thickness hardness results are guaranteed uptp 9.5″ dia. Diameters above 10″ dia are tested at 1″ below the surface.

AISI 4145H MOD Q&T 285/341BHN YLD 120 KSI MIN HOLLOW BORED BAR

DIAMETER DIAMETER
3.5″ OD x 1″ ID 7″ OD x 2.5″ ID
3.5″ OD x 2.19″ ID 7″ OD x 2.7/16″ ID
4″ OD x 1″ ID 7″ OD x 2.9/16″ ID
4″ OD x 1.5″ ID 7″ OD x 2.13/16″ ID
4.25″ OD x 2.25″ ID 7″ OD x 3″ ID
4.5″ OD x 2″ ID 7″ OD x 3.5″ ID
4.75″ OD x 1″ ID 7″ OD x 4″ ID
4.75″ OD x 1.5″ ID 7.5″ OD x 3″ ID
4.75″ OD x 2″ ID 7.5″ OD x 3.25″ ID
5″ OD x 1″ ID 7.5″ OD x 3.5″ ID
5″ OD x 1.5″ ID 8″ OD x 2.25″ ID
5″ OD x 2″ ID 8″ OD x 2.5″ ID
5″ OD x 2.25″ ID 8″ OD x 2.13/16″ ID
5″ OD x 2.5″ ID 8″ OD x 3″ ID
5″ OD x 3″ ID 8″ OD x 4″ ID
6″ OD x 3.5″ ID 8.5″ OD x 3″ ID
6.5″ OD x 1.5″ ID 8.5″ OD x 3.25″ ID
6.5″ OD x 2.25″ ID 8.5″ OD x 3.5″ ID
6.5″ OD x 2.13/16″ ID 8.5″ OD x 5.5″ ID
6.625″ OD x 3″ ID 9.5″ O x 3″ ID
6.75″ OD x 2.25″ ID 10″ OD x 3″ ID
6.75″ OD x 2.75″ ID 10″ OD x 3.5″ ID
6.75″ OD x 2.25″ ID 10″ OD x 4″ ID
6.75″ OD x 3″ ID 12.25″ OD x 3″ ID
7″ OD x 1.5″ ID 12.25″ OD x 8″ ID
7″ OD x 1.75″ ID 14″ OD x 3″ ID
7″ OD x 2″ ID 14.5″ OD x 3″ ID
7″ OD x 2.25″ ID 16″ OD x 3″ ID

* NS 1 through thickness hardness