Characteristics of the material 7KH3 ( 7H3, 7Х3 ).
Material :
7KH3 ( 7H3, 7Х3 )
Substitute:
8Х3
Classification :
Die tool steel
Chemical composition in % of the material 7KH3 ( 7H3, 7Х3 ) .
C
Si
Mn
Ni
S
P
Cr
Mo
W
V
Ti
Cu
0.65 - 0.75
0.15 - 0.35
0.15 - 0.4
max 0.35
max 0.03
max 0.03
3.2 - 3.8
max 0.2
max 0.2
max 0.15
max 0.03
max 0.3
Temperature of critical points of the grade 7KH3 ( 7H3, 7Х3 ).
Ac1 = 770 , Ac3(Acm) = 730 , Mn = 400
Mechanical properties under Т=20oС of the material 7KH3 ( 7H3, 7Х3 ) .
Assortment
Dimension
Direct.
sв
sT
d5
y
KCU
Heat treatment
-
mm
-
MPa
MPa
%
%
kJ / m2
-
1320
1240
10
36
370
Guenching 870oC, oil, Drawing 500oC, 2h,
Brinell hardness of the material 7KH3 ( 7H3, 7Х3 ) (annealing) ,
HB 10 -1= 229 MPa
Technological properties of the material 7KH3 ( 7H3, 7Х3 ) .
Weldability:
is not used.
Flakes :
predisposed
Temper brittleness:
predisposed
Specification :
Mechanical properties :
sв
- Tensile strength , [MPa]
sT
- Yield stress, [MPa]
d5
- Specific elongation at fracture , [ % ]
y
- Reduction of area , [ % ]
KCU
- Impact strength , [ kJ / m2]
HB
- Brinell hardness , [MPa]
Weldability :
without limitations
- welding is done without heating and subsequent heat treeting
limited weldability
- welding is possible under heating up to 100-120 grade and subsequent heat treeting
hard weldability
- obtaining the quality welding needs the additional operations:heating up to 200-300 grade; the heat treeting ia annealing
Database of steels and alloys (Marochnik) contains information about chemical composition and properties of 1500 steels and alloys (stainless steel, alloy steel, carbone steel, structural steel, tool steel, cast iron, aluminum alloy, titanium alloy, copper alloy, nickel alloy, magnesium alloy and others). Helpfull for specialists in material technology, structural engineer, mechanical engineer, metallurgy and metal trader
