JIS G3461 Carbon Steel Boiler and Heat Exchanger Tubes

STB 340
STB 410
STB 510

STB 35
STB 42
STB 52

GRADE

GRADE

GRADE

GRADE

GRADE

D 3563

STBH340
(STB35) 

A 161
A 178
A 192
A 226
A 556

LC
Gr A
–
–
Gr A2

G-3461

STB340
(STB35)

17175

St 35.8

3059

 S 1 360
 S 2 360
 ERW 320, 360
 CEW 320, 360

STBH410
(STB42) 

A 178
A 210
A 266
A 266
A 556

Gr C
Gr A1
Class1
Gr B2
Gr B2 

STB410
(STB42)

17175

St 45.8

3059

 S 1 440
 S 2 440
 ERW 440
 CEW 440

STBH510
(STB52) 

A 178
A 210
A 266
A 556

Gr D
Gr C
Class 3
Gr C2

STB510
(STB52)

–

–

–

–

C

Si

Mn

P

S

STB 340
   STB 410  
STB 510

0.18  
0.32  
0.25  

0.35  
0.35  
0.35  

0.30~0.60
0.30~0.80
1.00~1.50

0.035  
0.035  
0.035  

0.035  
0.035  
0.035