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JIS G3444 Carbon Steel Tubes For General Structure

JIS G3444 specification is used for civil engineering and architecture. There are five grades and four welding methods in this standard. Grade: STK290 STK400 STK490 STK500 STK540. Welding methods: Seamless , Electric resistance welding , Butt welded, Automatic arc welded.

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Description

JIS G3444 Carbon Steel Tubes For General Structure

JIS G3444 specification is used for civil engineering and architecture such as towers, scaffoldings, footing piles, foundation piles, piles for landslide suppression. in application for foundation piles, however, this standard is only applicable to welded steel tubes of outside diameter under 318.5mm, and in application for piles for landslide suppression, to seamless steel tubes and welded steel tubes of outside diameter under 318.5mm.

Manufacturing method of JIS G3444 carbon steel tubes for general structure

a. The tubes shall be manufactured by combination of the tube manufacturing method and the finishing method which is hot or cold rolled. If required, tubes may be subjected to an appropriate heat treatment.

b. The tubes may be manufactured using coated steel sheet and coated steel strip, if so requested by the purchaser.

c. The tubes shall be furnished with plane ends, unless otherwise specified. If the purchaser specifies bevel end finishing, the shape of bevel end shall be as agreed between the purchaser and the manufacturer.

Welding process:Seamless "S"

Electric resistance welding "E"

Butt welded "B"

Automatic arc welded "A"

Chemical composition and mechanical properties

Grade	C	Si	Mn	P/S	Tensile strength	Yield strength	Elongation %
STK290	-	-	-	0.050 max	290 min	-	30 min
STK400	0.25 max	-	-	0.040 max	400 min	235 min	23 min
STK490	0.18 max	0.55 max	1.65 max	0.035 max	490 min	315 min	23 min
STK500	0.24 max	0.35 max	0.30-1.30	0.040 max	500 min	355 min	15 min
STK540	0.23 max	0.55 max	1.50 max	0.040 max	540 min	390 min	20 min

Marking of JIS G3444 carbon steel tubes for general structure

Each tube having passed the inspection shall be marked with the following information. For tubes of smaller outside diameter or when there has been a special request by the purchaser, marking may be given on each bundle of tubes by a suitable method. The order of markings is not specified. When approved by the purchaser, part of the items may be omitted as far as the product can be still identified.

a. Symbol of grade

b. Manufacturing method: Hot finished seamless steel tube -S-H

Cold finished seamless steel tube -S-C

Electric resistance welded steel tube -E-G

Hot finished electric resistance welded steel tube -E-H

Cold finished electric resistance welded steel tube -E-C

Butt-welded steel tubes -B

Automatic arc welded steel tubes -A

c. Dimensions: outside diameter and wall thickness

d. Manufacture's name or its brand

G3444 details