Jis G3429 Seamless Steel Tube

JIS G3429 seamless steel tubes

JIS G3429 seamless steel tubes are used for the manufacture of seamless steel gas cylinders specified in JIS B 8230 and JIS B 8241.

JIS G3429 manufacture method:
(1) Manufactured in open-hearth furnace or electric furnace(Seamless).

(2) The tubes is manufactured with no heat treatment.

Chemical Composition:

Class C Si Mn P S Ni Cr Mo
STH11 0.50 max 0.10~0.35 1.80 max 0.035max 0.035max - - -
STH12 0.30~0.41 0.10~0.35 1.35~1.70 0.030max 0.030max - - -

STH21

0.25~0.35

0.15~0.35

0.40~0.90

0.030max

0.030max

0.25 max

0.80~1.20

0.15~0.30

STH22

0.33~0.38

0.15~0.35

0.40~0.90

0.030max

0.030max

0.25 max

0.80~1.20

0.15~0.30

STH31 0.35~0.40 0.10~0.50 1.20~1.50 0.030max 0.030max 0.50~1.00 0.30~0.60 0.15~0.25

Tolerances:

Tolerance on outside diameter Tolerance on wall thickness Tolerance on wall thickness disparity Tolerance on length
1% +30% Within 20% of the nominal wall thickness >+30mm

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