1. Main application:
For cold work moulds with high precision, long service life requirements, such as punching die, cold extruding mould, precision measuring tool. Cutting, stamping tools, shear blades, thread rolling dies, cold extrusion dies, drawing and bending
tools, flanging and straightening rolls, fine cutting tools, deep drawing tools, plastic moulds for abrasive polymers.
2. Manufacturers:
Changcheng Steel, Huangshi
3. Delivery conditions:
EAF+LF+VD or ESR, hot rolling or forging, black surface or Turned,(milling)
Soft annealed to max. 250 HB
4. General：
Thorough hardenability, high tough resistance, high oxidation resistance
5. Chemical composition:
|
Grade
|
Standard
|
C
|
Si
|
Mn
|
Cr
|
Mo
|
V
|
P、S≤
|
|
D2
|
ASTM
|
1.40-1.60
|
0.10-0.60
|
0.20-0.60
|
11.0-13.0
|
0.70-1.20
|
0.50-1.10
|
0.030
|
|
1.2379
|
DIN
|
1.45-1.60
|
0.10-0.60
|
0.20-0.60
|
11.0-13.0
|
0.70-1.00
|
0.70-1.00
|
0.030
|
|
Cr12Mo1V1
|
GB
|
1.40-1.60
|
≤0.60
|
11.0-13.0
|
0.70-1.20
|
0.50-1.10
|
0.030
|
|
|
SKD11
|
JIS
|
1.40-1.60
|
≤0.40
|
≤0.60
|
11.0-13.0
|
0.80-1.20
|
0.20-0.50
|
0.030
|
6. Mechanical properties:
Ledeburitic 12% chrome steel, very high resistance against abrasive and adhesive wear due to a high volume of hard carbides in the steel matrix, good toughness, very good dimensional stability, high compressive strength, very good base material for PVD/CVD coating as well as nitriding due to its secondary hardening properties. Similar to AISI D2.
7. Available sizes:
Round Bar: Φ 6-410mm
Flat: 8-160*205-710mm
Mould: 200*200-1200*1000mm
Length: 3000-6000mm
Mill deliver conditions, or sawing or cutting for customer request.
|
Delivery condition:
|
Soft annealed steel, max. 250 HB
|
||||
|
Physical features:
|
Temperature [oC]
|
20-100
|
20-200
|
20-300
|
20-400
|
|
Thermal expansion [10-6.K-1]
|
10.5
|
11.5
|
11.9
|
13.0
|
|
|
Temperature [oC]
|
20
|
350
|
700
|
|
|
|
Heat conductivity [W.m-1.K-1]
|
16.7
|
20.5
|
24.2
|
|
|
8. Heat treatment:
|
Recommended temperatures for heat processing:
|
|||
|
Soft annealing:
|
Temperature [oC]
|
Cooling
|
Hardness
|
|
820-850
|
Furnace
|
max. 255 HB
|
|
|
Annealing after decreasing stress:
|
Temperature [oC]
|
Cooling
|
|
|
600-650
|
Furnace
|
|
|
|
Hardening and tempering:
|
Temperature [oC]
|
Hardening
|
Tempering
|
|
1000-1030
|
oil, pressure gas (N2),
air or hot bath
500 - 550°C
|
see tempering
diagram ①
usually < 300°C
|
|
|
1040-1080
|
oil, pressure gas (N2),
air or hot bath
500 - 550°C
|
see tempering
diagram ②
usually > 480°C
|
|