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JIS G3461 carbon steel tubes for boiler

JIS G3461 carbon steel tubes for boiler

This Japanese Industrial standard specifies the carbon steel tubes,hereinafter refered to as "tubes",used for exchanging heat on the inside and outside of the tube,such as water tubes,smoke tubes,catalyser tubes,etc.used in chemical and petroleum industries. however,it is not applicable to the steel tubes for heating furnace and steel heat exchanger tubes for low temperature service.

Description

JIS G3461 carbon steel tubes


1.Apperance 

(1)The tue shall be practically straight and its both ends shall be at right angles to its axis.

(2)The inside and outside surfaces of the tube shall be well-finished and free from defects injurious to use.However,in the cas of electric resistance welded thbe the swelling of inside surface of the weld shall be 0.25mm or less.In this case,if necessary,the purchaser may specify the inside swelling as 0.5mm or less for the tubes 50.8mm or under in outside diameter and at the same time 3.5mm or under in wall thickness.


2.Class Symbol


Class new

Information reference

Traditional symbol 

STB 340STB 35
STB 410STB 42
STB 510STB 52


3.Chemical Composition


Grade Mfg.processChemical composition %
C(max)

Si

(max)

Mn

P

(max)

S

(max)

NiCrMoothers
STB35

S,E

0.18

0.35

0.30-0.60

0.035


0.035


----
STB42
S,E0.32

0.35


0.30-0.60

0.035


0.035


----
STB52S,E0.25

0.35


1.00-1.50

0.035


0.035


----


4.Mechanical properties


Symbol of classTensile strength N/mm²Yield point or proof stree N/mm²Elongation %

Outside diameter 20mm or 

over

Outside 

diameter 10mm or

 over to and excl.10mm

Outside 

diameter under 10mm

No.11 test

 piece No.12 

test piece

No 11 tes

piece

No.11 test

 piece

STB 340
340175353027
STB 410410255252017
STB 510510295252017


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