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The E470 Seamless Steel Tube
Date:2021-03-17      Views:200Time      Label:The E470 Seamless Steel Tube

The E470 seamless steel tube is widely used in automobile, oil and gas, general engineering, and agriculture industries, such as: bushing, hydraulic cylinder, hollow shaft, hollow transmission roller, geer, drilling and grinding tools, etc.

The melting composition index of grade E470 is shown in the following table:


Steel Grade

C

Si

Mn

P

S

Other elements

Steel Name

Steel No.

min.

max.

mix.

max.

min.

max.

min.

max.

 

E470

1.0536

0.16

0.22

0.10

0.50

1.30

1.70

1.030

0.035

AI:min.0.010;N:max.0.020; Nb:max.0.07;  V:0.05-0.15

Al, Nb, V and N are added to the basic elements of C-SI-Mn to give full play to the precipitation strengthening effect of V-N and improve the intensity index. At the same time, Al and Nb were used to refine grain and reduce brittle transition temperature.


Key process control:

1.Piercing process, piercing heating temperature control in 1200~1240℃, keeping the heat uniform. The piercing mold should be inspected and polished to prevent the scratch on the hollow billets caused by mold damage. The piercing unit shall be adjusted correctly, the bite of billet is stable, the hollow billets are ejected smoothly, the piercing process is stable, and the mandril does not jump obviously.
2.Hollow billets annealing, in order to prevent steel pipes from crack in cold drawing and cold rolling process, hollow billets shall be annealed. The critical points of E470, Ac1 and Ac3, are 730℃ and 853℃ respectively. The temperature is set to be slightly lower than Ac1, 720℃ according to recrystallization annealing. After 45 minutes of heat preservation, air cooling can be carried out to ensure the success of subsequent cold drawing and cold rolling.
3.Finished heat treatment, according to the standard requirements, E470 can be hot rolled, or cold finished + normal delivery condition. Normalizing temperature is set at 880~920℃. After 15 minutes of heat preservation, the cooled flue gas with little oxygen content is used to strengthen cooling. The fan is set at 50Hz and then comes out of the furnace to ensure the strength index of the finished product.

Steel Grade

Minimum Mechanical Properties

 

Yield Strength(ReH)Mpa

Tensile Strength(Rm)Mpa

Elongation A%

 

For T in mm

For T in mm

L

T

 

≤16

16
≤40

40
≤65

65
≤80

80
≤100

≤16

16
≤40

40
≤65

80
≤100

 

 

E470

470

430

-

-

-

650

600

-

-

17

15

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