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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 class | Heat treatment |
| STBL 380 | Normalizing or normalizing and successive tempering |
| STBL 450 | |
| STBL 690 | Double normalizing and successive tempering or quenching and tempering |
Chemical composition
Symbol of class | chemical composition % | |||||
| C | Si | Mn | P | S | Nil | |
| STBL 380 | 0.25 max | 0.35 max | 1.35 max | 0.035 max | 0.035 max | - |
| STBL 450 | 0.18 max | 0.10-0.35 | 0.30-0.60 | 0.030 max | 0.030 max | 3.20-3.80 |
| STBL 690 | 0.13 max | 0.10-0.35 | 0.90 max | 0.030 max | 0.030 max | 8.50-9.50 |
Mechanical properties
| Symbol of class | Tensile 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 380 | 382 min | 206 min | 35 min | 30 min | 27 min |
| STBL 450 | 451 min | 245 min | 30 min | 25 min | 22 min |
| STBL 690 | 686 min | 520 min | 21 min | 16 min | 13 min |
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