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Boiler tubes, heat exchanger tubes

Welded pipes

L, LL, KLM finned tubes (finned tubes)

G embedded fin tubes (finned tubes)

(serrated) extruded finned tubes

high frequency welded (serrated) fin tubes (finned tubes)

Laser welded fin tubes (finned tubes)

hot dipped galvanized oval (elliptical) finned tubes, rectangular fin tubes

condenser fin flat tubes

inner finned tubes (finned tubes)

Studded Pipes

H / double H fin tubes (finned tubes)

longitudinal fin tubes (finned tubes)

Tube finning machine

Aluminum plates, strips,foils

Aluminum welding wire rod

Aluminum tubes, profile

Economizer for Boiler

air-cooled heat exchanger (air cooler)

seamless fin tubes with two longitudinal opposite fins

material

standard & specification

 
 
ASTM A199 steel tubes,T5, T11, T12, T22, T91

ASTM-A 199 (94) Alloy Steel Tubes for Heatexchanger and Boilers


Chemical composition and mechanical properties


Manufacturing Process Seamless Chemical Requirements

Element C Mn P S Si Cr Mo Others
Grade                
T4 0.05 - 0.15 0.30-0.60 0.025 0.025 0.50-1.00 2.15-2.85 0.44-0.65 ...
T5 0.15max 0.30-0.60 0.025 0.025 0.50max 4.00-6.00 0.45-0.65 ...
T9 0.15max 0.30-0.60 0.025 0.025 0.25-1.00 8.00-10.00 0.90-1.10 ...
T11 0.05 - 0.15 0.30-0.60 0.025 0.025 0.50-1.00 1.00-1.50 0.44-0.65 ...
T12 0.05 - 0.15 0.30-0.60 0.025 0.025 0.50max 2.65-3.35 0.80-1.06 ...
T22 0.05 - 0.15 0.30-0.60 0.025 0.025 0.50max 1.90-2.60 0.87-1.13 ...
T91 0.08 - 0.12 0.30-0.60 0.020 0.010 0.20-0.50 8.00-9.50 0.85-1.05 *

 

* Ni 0.40 max; V 0.18-0.25; Cb 0.06-0.10; N 0.03-0.07; Al 0.04 max

  Tensile Strength,min Yield Strength,min Elongation
    (0.2% offset),min, in 2 in. or 50 mm,
Grade KSI (MPa) KSI (MPa) (or 4D),min, ;%
All Grades      
Except T91 60 [415] 25 [170] 30
Grade T91 85 [585] 60 [415] 20
 
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