SEAMLESS CARBON STEEL PIPE/TUBE
SEAMLESS STAINLESS
STEEL TUBE/PIPE
CYLINDER TUBE
PISTON ROD/CHROME BAR
TUBE COMPONENTS
Contact Phone
Certificate
CYLINDER TUBE

A.CHEMICAL COMPOSITION


Supply condition
Steel grade

Cold finished(Hard)( BK)

Cold drawn and stress-relieved(BK+S)

Hardness HB

Tensile strength MPa

Elongation
(%)

Tensile trength
MPa

Yield strength MPa

Elongation
(%)

20#

°›550

°›8

°›570

°›470

°›14

175

45#

°›650

°›5

°›600

°›520

°›12

207

St52

°›640

°›5

°›600

°›520

°›15

190

25Mn

°›640

°›5

°›600

°›510

°›15

195

27SiMn

°›840

°›5

°›800

°›720

°›10

230


B.MECHANICAL PROPERTIES


Steel grade

C

Si

Mn

P

S

Cu

Ni

Cr

20#

0.17~0.23

0.17~0.37

0.35~0.65

0.035

0.035

0.25

0.30

0.25

45#

0.42~0.50

0.17~0.37

0.50~0.80

0.025

0.02

0.20

0.25

0.25

25Mn

0.22~0.29

0.17~0.37

0.70~1.00

0.03

0.03

0.20

0.30

0.25

27SiMn

0.24~0.32

1.10~1.40

1.10~1.40

0.035

0.035

0.30

0.30

0.30

Steel grade

C

Si

Mn

P

S

V

Nb

Ti

Al

ST52

<0.18

<0.55

1.00~1.60

0.03

0.03

0.02~0.15

0.015~0.06

0.02~0.20

0.015

C. OTHER TECHNICAL PARAMETERS
WELDABILITY
STEEL GRADES HAVE A VERY GOOD WELDABILITY ACCORDINGLY TO THE
COMMON WELDING SYSTEM.(CARBON EQUIVALENT 0.45)
TOLERANCES
1°ĘOUTER DIA
< 40 mm +/-0.2mm
FROM 40 TO 100 mm +/-0.3mm
>100mm +/-0.5mm
2°ĘWALL THK
<120mm OD +/-5%
>120mm +/-7.5%
3. STRAIGHTNESS 1/1000 OF THE TUBE LENGTH
4. INSIDE HONNED DIA ISO H8
5. ROUGHNESS 0.2~0.4u
6. LENGTHS
LENGTH<500 +2mm
500<LENGTH<=2000 +3mm
2000<LENGTH<5000 +5mm
5000<LENGTH<7000 +10mm
TUBE ENDS
TUBE ENDS SHALL BE CUT NOMINALLY SQUARE TO THE
TUBE AXIS AND SHALL BE FREE FROM THE EXCESSIVE BURRS.

 
 
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