TORICH GB/T24187 BHG1 Precision Single Welded Steel Tubes In Condenser

Type

State

Code

Bright Surface

No coating on the inner and outer surface of steel pipe

SL

Copper plated surface

Copper plating on the outer surface of steel tube

Cu

Galvanized surface

Galvanized or zinc alloy on the outer surface of steel pipe

Zn

Double-sided copper plating surface

The inner and outer surfaces of the steel pipe are plated with copper

Cu/Cu

External galvanized inner copper plating surface

Galvanized or zinc alloy on the outer surface of steel pipe, copper plating on the inner surface

Zn/Cu

a.       Use electroplating, electroless or hot dip plating.

b.       Manufacture of steel strip with double-sided copper plating, and the quality of the coating at the weld line should be negotiated by both suppliers and suppliers.

c.        Manufacture of steel strip with double-sided copper plating.

Category

C

Si

Mn

P

S

Cold rolled low carbon steel strip

≤0.08

≤0.03

≤0.30

≤0.030

≤0.030

Cold rolled ultra low carbon steel strip

≤0.008

≤0.03

≤0.25

≤0.020

≤0.030

Category

Tensile Strength

Yield Strength

Elongation

A/%

Ordinary steel pipe(MA)

≥270

≥180

≥14

Soft steel tube(MB)

≥230

150~220

≥35

a Replace with  when the yield phenomenon is not obvious.

b Sample type of sample number S7 in GB/T 228-2002.