FURNACE TUBE MATERIAL CHART

Tube Material ClassMajor Applicable SpecsHD HardnessMarginal
Temperature
JIS StandardsASTM
Brass tube for condenserC4430 (BSTF1)
C6870 (BSTF4)
C6871 (BSTF2)
C6872 (BSTF3)		B111-C44300
Cupronickel for condenserC7060 (CNTF1)
C7100 (CNTF2)
C7150 (CNTF3)		B111- C70600
B111- C71000
B111- C71500
Low carbon steelJIS STB340A83 - CrA
A161
A106- CrA
A178- CrA		565℃
Medium carbon steelJIS STB510A210
A106- CrB
A178- CrC		565℃
C-1/2 Mo steelJIS G 3462
JIS STBA12		A161- T1
A209- T1
A335- P1		565℃
1Cr-1/2 Mo steelJIS G 3462
JIS STBA22		A200- T12
A213- T12
A335- P12		110〜565℃
1-1/4Cr- 1/2 Mo steelJIS G 3462
JIS STBA23		A200- T11
A213- T11
A335- T11		130〜590℃
2-1/4Cr- 1 Mo steelJIS G 3462
JIS STBA24		A200- T22
A213- T22
A335- P11		130〜635℃
5Cr-1/2 Mo steelJIS G 3462
JIS STBA25		A200- T5
A213- T5
A335- T5		170〜700℃
9Cr- 1Mo steelJIS STBA26A200- T9200〜700℃
18Cr-8Ni steelJIS SUS27TBA271- TP304870℃
18Cr-8Ni-C steelJIS SUS43TBA271- TP347870℃
18Cr-8Ni-Ti steelJIS SUS29TBA271- TP321870℃
25Cr-12 Ni steelJIS SUS41TBA249- TP3091095℃
25Cr-20 Ni steelJIS SUS42TBA249- TP3101150℃
Carbon steel can be used at temperatures in the 400 - 450°C range.
Mo steel can be used can be used in the 450 -500°C range. (When temperatures exceed 550°C, Cr is added to elevate the oxidizing proof property.)
Cr-Mo steel can be used up to 600°C .
Austenite (stainless steel) can be used at around 850°C.