Database of Steel and Alloy (Marochnik)

HOME

STANDARDS

METALS

SEARCH

BULLETIN BOARD

GRADING

EDUCATION IN UKRAINE

CONTACTS

(495)
(495)

Metals -> Tool steel -> Carbon tool steel

Characteristics of the material U7А ( U7А, У7А ).

Material :	U7А ( U7А, У7А )
Substitute:	У8
Classification :	Carbon tool steel

Chemical composition in % of the material U7А ( U7А, У7А ) .

C	Si	Mn	Ni	S	P	Cr	Cu
0.66 - 0.73	0.17 - 0.33	0.17 - 0.28	max 0.2	max 0.018	max 0.025	max 0.2	max 0.2

Temperature of critical points of the grade U7А ( U7А, У7А ).

Ac₁ = 730 , Ac₃(Ac_m) = 770 , Ar₁ = 700 , Mn = 280

Mechanical properties under Т=20^oС of the material U7А ( U7А, У7А ) .

Assortment	Dimension	Direct.	s_в	s_T	d₅	y	KCU	Heat treatment
-	mm	-	MPa	MPa	%	%	kJ / m²	-
Band annealed	to 1.5		650		15

Brinell hardness of the material U7А ( U7А, У7А ) (annealing) ,

HB 10^-1= 187 MPa

Physical properties of the material U7А ( U7А, У7А ) .

T	E 10^{- 5}	a 10⁶	l	r	C	R 10⁹
Grade	MPa	1/Grade	Watt/(m·Grade)	kg/m³	J/(kg·Grade)	Ohm·m
20				7830		130

Technological properties of the material U7А ( U7А, У7А ) .

Weldability:	is not used.
Flakes :	not predisposed
Temper brittleness:	not predisposed

Specification :

Mechanical properties :
s_в	- Tensile strength , [MPa]
s_T	- Yield stress, [MPa]
d₅	- Specific elongation at fracture , [ % ]
y	- Reduction of area , [ % ]
KCU	- Impact strength , [ kJ / m²]
HB	- Brinell hardness , [MPa]

Physical properties :
T	- Test temperature , [Grade]
E	- Young modulus , [MPa]
a	- Coefficient of linear expansion (range 20^o - T ) , [1/Grade]
l	- Termal (heat) condition coefficient , [Watt/(m·Grade)]
r	- Density , [kg/m³]
C	- Specific heat ( range 20^o - T ), [J/(kg·Grade)]
R	- Electrical resistance , [Ohm·m]

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

Top

Информация взята с сайта Марочник стали и сплавов

Главная | Новости | Марочник сталей | Контакты | Обратная связь

-12345-