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.

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.

Heat Treatment
Hardened and tempered.

Weldability
Poor, can be welded.

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.

Mechanical Properties: BAR

Yield strength Rp0.2,
MPa
Tensile strength Rm,
MPa
Elongation
[%]
Hardness
[HB]
Impact, Charpy-V, -20ºC
[J]
 Min. (110 ksi)  758  965  14,5  285  ≥ 27
 Max.  1068  341

ROUND BAR STOCK – MIN YLD 110 KSI

(30-36 HRC)

DIA DIA
1.5″ 180mm
1.75″ 7.25″
1.875″ 7.5″
2″ 8″
3″ 8.25″
2.5″ 8.5″
80 mm 220 mm
85 mm 8.75″
3.5″ 9″
95 mm 9.5″
4″ 10″
105 mm 11″
115 mm 12.25″
5″ 13″
5.5″ 14.375″
6″ 15″
155 mm 16″
6.5″ 17″
6.75″ 18″
7″ 20″

HOLLOW BORED BAR STOCK – MIN YLD 110 KSI

(30-36 HRC)

DIA DIA
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 1.75’’ ID 8″ OD x 2.5″ ID
5″ OD x 2″ ID 8″ OD x 3″ ID
5″ OD x 2.25″ ID 8″ OD x 4″ ID
5″ OD x 2.5″ ID 8.5″ OD x 3″ ID
5″ OD x 3″ ID 8.5″ OD x 3.25″ ID
6″ OD x 3.5″ ID 8.5″ OD x 3.5″ ID
7″ OD x 1.5″ ID 8.5″ OD x 5.5″ ID
7″ OD x 1.75″ ID 9.5″ O x 3″ ID
7″ OD x 2″ ID 10″ OD x 3″ ID
7″ OD x 2.25″ ID 10″ OD x 4″ ID
7″ OD x 2.5″ ID 12.25″ OD x 3″ ID
7″ OD x 3″ ID 12.25″ OD x 8″ ID
7″ OD x 3.5″ ID 14″ OD x 3″ ID
7″ OD x 4″ ID 390 mm OD x 250 mm ID
7.5″ OD x 3″ ID 16″ OD x 3″ ID
7.5″ OD x 3.25″ ID 20″ OD x 12″ ID

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Equivalent Standards

  • EN 1.7225
  • UNS G41450
  • AISI 4145 Modified
Tags: Round Bar & Bored Bar