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JIS G3464 Steel Tubes For Low Temperature Service

JIS G3464 Steel Tubes For Low Temperature Service

This Japanese industrial standard standard secifies the steel tubes,heseinafter referred to as the "tubes",used for the purpose of exchanging heat on the inside and outside of the tube at exceptionally low temperatures below freezing point,such as heat exchanger tubes,condenser tubes,etc.

Description

JIS G3464 steel tubes for low temperature service


Heat Treatment

Symbol of classHeat treatment
STBL 380Normalizing or normalizing and successive tempering
STBL 450
STBL 690Double normalizing and successive tempering or quenching and tempering


Chemical composition


Symbol of 

class

chemical composition %
CSiMnPSNil
STBL 3800.25 max0.35 max1.35 max0.035 max0.035 max-
STBL 4500.18 max0.10-0.350.30-0.600.030 max0.030 max3.20-3.80
STBL 6900.13 max0.10-0.350.90 max0.030 max0.030 max8.50-9.50


Mechanical properties


Symbol of classTensile strength(N/mm²)

Yield point or proof stress

 (N/mm²)

Elongation %

Outside 

diameter 20mm or

 over

outside

 diameter10mm or over to and excl 20mm

outside 

diameter under 10mm

No.11 test 

piece No.12 

test piece

No.11 test

 piece

No.11 test 

piece

STBL 380382 min206 min35 min30 min27 min
STBL 450451 min245 min30 min25 min22 min
STBL 690686 min520 min21 min16 min13 min


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