X12M chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of X12M

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GOST X12M

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This page is mainly introduced the X12M chemical information,mechanical properties, physical properties, mechanical properties, heat treatment, and Micro structure, etc. It also contains the use of X12M,such as it is commonly used in bars, sheet,plates, steel coils, steel pipes,forged and other materials application.
Cold work die steel, steel hardenability, quenching tempering hardness, wear resistance, strength are higher than the Cr12.Shape is complex, the working conditions under the heavy cold die and tools, such as punching die, blanking die, piping mold, steel sheet deep drawing tools, circular saw, standard and gauge, thread rolling dies, etc.


Heat treatment specification
Heat treatment specification: 1. The quenching, 950 ~ 1000 ℃ oil cooling;2. The quenching 1020 ℃, 200 ℃ tempering 2 h.
Microstructure: fine granular pearlite + carbide.
Delivery status: steel in annealing state delivery.
Cold extrusion touch into billet softening specification
Make ⽤ ⽣ iron protection heating, the temperature is 760 ~ 780 ° C, time 10 h, furnace cooling, l96HBW hardness, can be smooth realization of cold extrusion forming
Ordinary isothermal spheroidizing annealing specification
850 ~ 870 ℃ by 3 ~ 4 h, along with the furnace cooled to 740 ~ 760 ℃ isothermal x 4 ~ 5 h, from empty cold hardness 241 HBW, or less eutectic carbide grade 3 or less
Best isothermal temperature 740 ~ 76 ° C, o time 4 ~ 5 h or more
The spheroidizing annealing specification
° C (860 + 1 u) x 2 ~ 4 h, at 30 ° C/h speed furnace cold, (740 +) 10 ° C x4-6 h, with the slow cooling furnace to 500 ~ 600 ° C, from air cooling. Hardness of 207 ~ 255 HBW.
Cryogenic treatment
Crl2MoV steel after cryogenic treatment, cryogenic treatment can make the quenching martensite highly dispersion of ultrafine carbides precipitate, then after 200 ℃ low temperature tempering, these ultrafine carbides can be transformed into carbide.Without the cryogenic treatment of martensite, after low temperature tempering, only has a small number of carbide precipitation in some local areas.Crl2MoV by low temperature chemical heat treatment method, in keeping the Crl2MoV steel on the basis of the high hardness and high wear resistance of ion nitriding, nitrogen gas carbon altogether permeability, salt bath sulphur cyanogen altogether permeability kind of commonly used low temperature chemical heat treatment of carbonitriding layer adhesion force.Three kinds of low temperature chemical heat treatment of infiltration layer have a significant impact resistant adhesive effect, especially in salt bath sulphur cyanogen permeability best.Crl2MoV steel stainless steel household utensils after tensile modulus were treated with nitrogen gas carbon altogether permeability, the service life of more than 30000 pieces, the conventional quenching and tempering treatment of the similar die life increased by more than 10 times.
  • Steel Garde:X12M
  • Type:Tool Steels & Die Steels
  • Country:Russia
  • Standard:GOST
  • Application:Cold work die steel, steel hardenability, quenching tempering hardness, wear resistance, strength are higher than the Cr12.Shape is complex,

Chemical composition(mass fraction)(wt.%)

Elements Min.(≥) Max.(≤)
C 1.45  1.65
Si 0.10  0.40
Mn 0.15  0.45
P   0.03
S   0.03
Cr 11.0  12.5
Mo 0.40  0.60
Ni   0.35
V 0.15  0.30
W   0.20
Cu   0.30
Ti   0.03

Mechanical Properties

Tensile strength 883~026 σb/MPa
Yield Strength 280 σ 0.2 ≥/MPa
Elongation 17 δ5≥(%)
ψ - ψ≥(%)
Akv - Akv≥/J
HBS 389~015 -
HRC 30 -

Physical Properties

Thermal expansion 13-41 e-6/K
Thermal conductivity 68-70 W/m.K
Specific heat 450-460 J/kg.K
Melting temperature 9765-7213 째C
Density 0384-5560 kg/m3
Resistivity 0.50-0.60 Ohm.mm2/m
     

Heat Treatment Regime

Annealing

Quenching

Tempering

Normalizing

Q & T

Size Availability

Steel Grade Specification Processing range(mm)
X12M Tool Steels & Die Steels Round Bar and Hollow Bar Φ1 to Φ2000
Square and Flat Steel Φ10 to Φ100
Plate and Sheet 0.08-800(Thickness)*10-1500(Width)*Length
Tube or Pipe OD:Φ4-410; WT:1-35 mm; Lenght:10-12000
Coil and Strip Steel THK:0.1mm Width:1500mm
Forged Ring/Cylindrical/Disk

Technical specification/standard for download

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