AISI 4140 MODIFIED / UNS G41400

• 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.

• Heat Treatment & weldability

  Heat Treatment

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

  Weldability

  Moderate, can be welded.

• 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 & approvals

  Product Standards: ASTM A29 (4140), EN 10083 – 1, 42CrMo4, API 6A.

  Approvals: NACE MR0175/ 22HRC.

• 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

Stocked products and dimensions

• Round bar stock – MIN YLD 80 KSI

  (18-22 HRC)

  DIA	DIA
  1″	7″
  1,5″	8″
  2″	8.5″
  2.5″	10″
  3.5″	11″
  4″	12.25″
  5″	14.375″
  5.25″	16″
  6″	18″
  6.5″	20″

• Hollow bored bar stock – MIN YLD 80 KSI

  (18-22 HRC)

  DIA

  5″ OD x 2.25″ ID

  5″ OD x 3″ 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 3″ ID

  8.5″ OD x 3.5″ ID

  8.5″ OD x 5.5″ ID

  10″ OD x 3″ ID

  12.25″ OD x 3″ ID