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Characteristics for grade 70S2KHА ( 70С2ХА )

Grade :	70S2KHА ( 70С2ХА )
Classification :	Spring structural steel
Equivalent grades:	Go here

Chemical composition in % for grade 70S2KHА ( 70С2ХА )

C	Si	Mn	Ni	S	P	Cr	Cu
0.65 - 0.75	1.4 - 1.7	0.4 - 0.6	max 0.25	max 0.025	max 0.025	0.2 - 0.4	max 0.2

Mechanical properties under Т=20^oС for grade 70S2KHА ( 70С2ХА )

Assortment	Dimension	Direct.	s_в	s_T	d₅	y	KCU	Heat treatment
-	mm	-	MPa	MPa	%	%	kJ / m²	-
Band annealed , GOST 2283-79	0.1 - 4		880		8
Band cold-worked , GOST 2283-79	0.1 - 4		780-1180

Technological properties for grade 70S2KHА ( 70С2ХА )

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

Equivalent steels for grade 70S2KHА ( 70С2ХА )Warning! Indicated both exact and nearest equivalents.

Germany

France

Bulgaria

DIN,WNr

AFNOR

BDS

1.5029

71Si7

71S7

70S2ChA

Types of delivery of grade 70S2KHА ( 70С2ХА )

В22 - Graded and shaped rolling

B23 - Sheets and Strips

В32 - Graded and shaped rolling

B33 - Sheets and Strips

B34 - Ribbons

В72 - Medium-high and high-carbon steel wire

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

70S2KHА ( 70С2ХА ) - Spring structural steel: chemical composition, mechanical and physical properties, hardness
Database of steels and alloys (Marochnik) contains information about chemical composition and properties more then 3000 steels and alloys

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