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Economizer for Boiler

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material

standard & specification

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

ASTM-A 199 (94) Alloy Steel Tubes for Heat exchanger 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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