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Spring steel strip

sk7

Mechanical properties of spring steel strip

sk7

Chemical composition of spring steel strip

Dongguan guochuang metal material co., ltd

Material name:

SK7

Spring steel strip

Features and scope of application:

SK7

It is a widely used silicon-manganese spring steel. It is suitable for industrial production of railway vehicles, automobiles and tractors.

Leaf spring under heavy load

30 mm

The following coil springs

250

Heat-resistant spring in non-corrosive medium below 100℃

As well as large and important spiral springs that bear alternating loads and work under high stress.

It is also suitable for manufacturing products with working temperature or wire diameter.

At present, the strength, elasticity and hardenability are relatively high.

Sk7

Spring steel strip

Chemical composition:

carbon

C

0.56

~

0.64%

silicon (Si)

silicon (Si)

1.50

~

2.00%

manganese

manganese

0.60

~

0.90%

sulphur

S

:≤

0.035%

phosphorus (P)

P

:≤

0.035%

chrome

chrome

:≤

0.35%

nickel

nickel

:≤

0.35%

copper

copper

:≤

0.25%

Sk7

Spring steel strip

Mechanical properties:

strength of extension

σ

B (MPa)

:≥

1274( 130)

yield strength

σ

Seconds (MPa)

:≥

1 176( 120)

Expansibility

δ

10 (%)

:≥

five

Section shrinkage

talent

(%)

:≥

25

difficulty

: hot rolling

,

≤

32 1HB；

cold-draw

+

heat treatment

,

≤

32 1HB

Sk7

Spring steel strip

Heat treatment specification and metallographic structure;

Specification for heat treatment: quenching

870

℃

20

℃

,

Oil cooling