Seamless Steel Pipe Boiler Tube

Boiler tubes is a one of seamless pipe. Manufacturing methods is the same as seamless tube, but it has the stringent requirements for manufacture of steel pipes. According to the temperature level,boiler tube is divided into general boiler tubes and high pressure boiler tube.

Description

Boiler tube is a kind of seamless tube. The manufacturing method is the same as seamless pipe, but there are strict requirements for the steel used in the manufacture of steel pipes. According to the use of temperature is divided into general boiler tube and high pressure boiler tube two kinds.

The mechanical properties of boiler tubes are important indicators to ensure the final service performance of steel (mechanical properties), which depends on the chemical composition of steel and heat treatment system. In the steel pipe standard, according to different requirements, tensile properties (tensile strength, yield strength or yield point, elongation) and hardness, toughness indicators, as well as high and low temperature properties required by users.

Boiler Tube
Chemical requirements:

Chemical Components (%)

Grade

C

Mn

P

S

Si

Cr

Mo

V

Nb

N

Al

others

T2

0.10-0.20

0.30-0.61

≤0.025

≤0.025

0.10-0.30

0.50-0.81

0.44-0.65

 

 

 

 

 

T5

0.15

0.30-0.60

≤0.025

≤0.025

0.5

4.0-6.0

0.45-0.65

 

 

 

 

 

T5b

0.15

0.30-0.60

≤0.025

≤0.025

1.0-2.0

4.0-6.0

0.45-0.65

 

 

 

 

 

T9

0.15

0.30-0.60

≤0.025

≤0.025

0.25-1.0

8.0-10.0

0.90-1.10

 

 

 

 

 

T91

0.07-0.14

0.30-0.60

≤0.020

≤0.010

0.20-0.50

8.0-9.5

0.85-1.05

0.18-0.25

0.06-0.1

0.030-0.070

0.02

Ti 0.01 Zr 0.01

Tensile requirements:

Mechanical Properties

Grade

Tensile

Yield

Elongation

Hardness

Strength (Mpa)

Strength (Mpa)

(%)

 

T5b

≥415

≥205

≥30

≤89HRB

T9

≥415

≥205

≥30

≤89HRB

T91

≥585

≥415

≥20

≤25HRC

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