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 minimum yield 125 ksi / 110 ksi.

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 (Specific for Bars)

Weight % C Mn P S Si Cr Ni Mo Cu V Al
Min.  0,43  0,80      0,20  0,85    0,25      0,010
Max.  0,48  1,20  0,020  0,020  0,35  1,20  0,25  0,35  0,30  0,05  0,035

Reference Standards

Bars:

  • ASTM A29 (for chemical only), type 125 ksi or 110 ksi.

Mechanical Properties (Specific for Bars)

  Yield strength Rp0.2,
MPa
Tensile strength Rm,
MPa
Elongation
[%]
Hardness
[HB]
Impact, Charpy-V, -20ºC
[J]
Impact, Charpy-V, 0ºC
[J]
 125 ksi 862  965 – 1103  14,5  285 – 341  ≥ 27  ≥ 41
 110 ksi  758  965 – 1068  14,5  285 – 341  ≥ 27  

Round Bar Stock 

 

DIA DIA
1.5″ 180 mm
1.75″  
2″ 7.5″
3″ 8″
2.5″  
3.5″ 8.5″
4″  
5″  
5.5″ 9″
6″ 9.5″
7″ 10″
  11″
  12.25″
  13″
   
  15″
  16″
  17″
  18″
  20″

Hollow Bored Bar Stock 

 

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
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
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
20″ OD x 12″ ID

View stock list

Material Weight Calculator

Hardness conversion

PREN Calculator

ksi / MPa converter

Equivalent Standards

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