50mm Wall thickness Carbon Steel Tubes for General Structural Purposes

CHEMICAL COMPOSITION %  max

Steel grade

C

Si

Mn

P

S

STK290

-

-

-

0.05

0.05

STK400

0.25

-

-

0.04

0.04

STK490

0.18

0.55

1.65

0.035

0.035

STK500

0.24

0.35

0.30-1.30

0.04

0.04

STK540

0.23

0.55

1.50

0.04

0.04

Notes:1. if necessary,alloying elements other than specified in the above table may        be added 
 2.For the tube of grade STK 540 exceeding 12.5mm in wall thickness,the chemical composition may be agreed upon by the purchaser and manufacturer.

MECHANICAL PROPERTIES min

Steel grade

Tensile strength Mpa

Yield point or proof stress Mpa

Tensile strength in weld zone Mpa

Flattening

Bendability

Distance between plates(H)

Bend angle

Inside radius

Applied outside diameter

All outside diameter

All outside diameter

All outside diameter

All outside diameter

50mm max

STK290

290

-

290

2/3D

90°

6D

STK400

400

235

400

2/3D

90°

6D

STK490

490

315

490

7/8D

90°

6D

STK500

500

355

500

7/8D

90°

6D

STK540

540

390

540

7/8D

90°

6D