Product

China 25CrMo4-Alloy steel

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China 25CrMo4-Alloy steel is a heat-resistant, heat-treatable steel grade that is often used for components with high loads in motorsport, industry and in aviation. Among other things, screws, crankshafts, roll cages, chassis components and vehicle frames are made from this.

Description

China 25CrMo4-Alloy steelis a heat-resistant, heat-treatable steel grade that is often used for components with high loads in motorsport, industry and in aviation. Among other things, screws, crankshafts, roll cages, chassis components and vehicle frames are made from this. Due to its chemical composition, 25CrMo4 is suitable for hardening and has a tensile strength of over 650 N / mm² in the tempered state. China 25CrMo4-Alloy steel is valued for its good weldability and bendability.It has excellent hardenability and tempering properties by adding proper Cr, Mo and other alloy elements.Through suitable tempering treatment,it maintains high strength and high toughness,as well as high temperature resistance,wear-resistant properties. 25CrMo4 Steel is suitable for the parts which serve in a complex environment.

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 10216-2: 2014 Seamless steel tubes for pressure purposes. Technical delivery conditions. Non-alloy and alloy steel tubes with specified elevated temperature properties
  • 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 steel
  • EN 10297-1: 2003 Seamless circular steel tubes for mechanical and general engineering purposes. Non-alloy and alloy steel tubes. Technical delivery conditions

Application

25CrMo4 Steel is mainly used in the mechanical engineering industry of automotive parts,oilfield equipment, etc.Due to its excellent strength,toughness and wearresistance, 25CrMo4 is often used as cutting tools such as die cutter, saw matrix, etc. This steel maintains its hardness and strength even in the high temperatures,so it can be used in energy industries to make steam turbines, boiler fasteners. 25CrMo4 can also be used as a centralizer in the oil drilling work.

Chemical composition

C Si Mn P S Cr Mo
0.22 – 0.29 max   0.4 0.6 – 0.9 max   0.025 max   0.035 0.9-1.2 0.15-0.3

Equivalent Grades

EU Germany Japan France England China Russia Inter
EN DIN,WNr JIS AFNOR BS GB GOST ISO
25CrMo4 25CrMo4 SCM420

SCM430

25CD4 708A25

708M25

CFS10

 

30CrMo

 

20KHM

30KHM

30KHMA

25CrMo4

China 25CrMo4-Alloy steel

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

Mechanical properties of Steel 25CrMo4(1.7218)

  • Tensile Strength:min 740 N/mm2
  • Yield Strength:min. 590 N/mm2
  • Elongation:min.15 %(l)
  • Kv-Imapct value:min.80J (l)

Heat Treatment Conditions

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

Normalizing:860 – 900 °C with slow cooling in air

Soft Annealing:680 – 720℃ with slow cooling in the furnace

Stress Relieving:525-620℃ with cooling in air

Hardening:840 – 880°C,oil or water

Tempering:540 – 680 °C with cooling in air

Hot-rolled, peeled, bright and drawn bars 25CrMo4, 1.7218

Forged bars and Open Die forgings 25CrMo4, 1.7218

Cold drawn tubes AISI 4130, 25CrMo4, 1.7218

Cold rolled strips 25CrMo4, 1.7218

Sheets and plates AISI 4130, 25CrMo4, 1.7218

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