Product

China 42CrMo4-Alloy steel

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China 42CrMo4-Alloy steel (1.7225 steel) is an European standard alloy steel, the delivery condition of this steel is mostly tempered and quenched, It has high strength, high toughness, good hardenability, temper brittleness, high fatigue limit, good impact resistance after quenching and tempering, and good low temperature impact toughness.

Description

China 42CrMo4-Alloy steel is an European standard alloy steel, the delivery condition of this steel is mostly tempered and quenched, it has high strength, high toughness, good hardenability, temper brittleness, high fatigue limit, good impact resistance after quenching and tempering, and good low temperature impact toughness. This steel is suitable for the manufacture of large and medium-sized plastic molds requiring a certain degree of strength and toughness, transmission gears, rear axles, load-carrying connecting rods, spring clips and oil deep well drill pipe joints.

Reference standard

  • EN 10083-3: 2006 Steels for quenching and tempering. Technical delivery conditions for alloy steels
  • EN 10132-3: 2000 Cold rolled narrow steel strip for heat treatment. Technical delivery conditions. Steels for quenching and tempering
  • EN 10305-1: 2010 Steel tubes for precision applications. Seamless cold drawn tubes. Technical delivery conditions
  • EN 10269: 1999 Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties
  • EN 10263-4: 2001 Steel rod, bars and wire for cold heading and cold extrusion. Technical delivery conditions for steels for quenching and tempering
  • EN 10250-3: 2000 Open steel die forgings for general engineering purposes. Alloy special steels
  • EN 10297-1: 2003 Seamless circular steel tubes for mechanical and general engineering purposes. Non-alloy and alloy steel tubes. Technical delivery conditions

Application

China 42CrMo4-Alloy steel is widely used for engineering steel purpose, such as: making various kinds of machinery, automobile, mining spare part, the gearwheel of the engine, the driving gear of supercharger, the connecting rob, the pinchock under the high pressure, parts for power train applications, cold formed fastenercomponents, shafts, gears, drill collars for the oil exploration, etc.

Size Tolerance

Surface Finish Size Tolerance Length
Black For Forged condition (0,+5mm) Multiple Length/Fixed Length
Black For Rolled condition (0,+1mm)
Turned (0,+3mm)

Mechanical properties

  • Yield strength Re: > 500 MPa.
  • Tensile strength Rm: 750-900 MPa.
  • Elongation A: > 14 %
  • Percent reduction of area Z: > 550 %
  • Impact energy KV: > 35 J.

Heat Treatment Conditions

  • +A   Soft annealed/Soft annealing
  • +N   Normalized/Normalizing
  • +QT  Quenched and Tempered
  • +U   Untreated
  • +SR  Stress Relieved

Normalizing:  850 – 880°C,Cooling in air

Soft Annealing:680 – 720°C,Cooling in furnace

Stress relieve:450-650°C,Cooling in air

Hardening:820 – 880°C,oil or water quench

Tempering:540 – 680°C,Cooling in air

Drawn and hot-rolled bars, flat bars 42CrMo4,1.7225

Forgings and forged bars in grade 42CrMo4,1.7225

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