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JIS G3429 specifications apply to seamless steel pipes-CONTINENTAL STEEL CO.,LTD
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JIS G3429 specifications apply to seamless steel pipes

Mar 06, 2024

JIS G3429 specifications apply to seamless steel pipes

JIS G3429 seamless steel pipe is used to manufacture seamless steel gas cylinders specified in JIS B 8230 and JIS B 8241.

JIS G3429 manufacturing method:
(1) Manufactured using open hearth or electric furnace (seamless).

(2) The pipe is manufactured without 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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