AISI 4145H MODIFIED / UNS G41450

• 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 & weldability

  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

Stocked products and dimensions

• 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