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JIS G3442 Galvanized Steel Pipes for Water Service

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JIS G3442 Galvanized Steel Pipes for Water Service

JIS G3442 Galvanized Steel Pipes for Water Service

1. Scope
This Standard specifies the galvanized steel pipe to be used mainly for water service at the head of 100m.

2. Steel Grade
JIS G3443 Grade SGPW (equal to ASTM A53 type F)

3. Zinc Coating Characteristic
The zinc coating characteristic of pipe shall be as follows:
(1) The zinc coating weight in coating weight test of pipe (antimony chloride method) shall be not less than 600g/m2 in the average value found per lot [refer to 8.1 (5)] and not less than 550g/m2 per pipe.
(2) Pertaining to the number of immersions in the uniformity test, the end point shall not be reached even after 6 immersions (1) for the pipe and 5 immersions (2) for the socket.
A Shall be as specified in JIS H 8641.
B Shall be in accordance with JIS B 2301 or JIS B 2302.
(3) The pipe shall endure not less than 100 minutes before the evolution of bubbles ceases in the alkali test.
(4) The pipe of designation 50 A (2 B) and downward, when subjected to the bending test, shall be free from peelings or other abnormalities on the zinc coated surface in a bent portion.

4. The Dimensions, Dimensional Tolerances and Mass, pls check G3442

6. Manufacture Method
6.1 The pipe shall be of the black pipe with plane end specified in JIS G 3452 and shall be given hot dipped zinc coating in accordance with JIS H 9124 prior to threading and tapping.
6.2 The hot-dip galvanizing process shall be as follows:
(1) Zinc to be used for galvanizing shall be the distilled zinc ingot Class 1 of JIS H 2107 or zinc ingots at least equal in quality.
(2) The pipes and sockets shall be, prior to threading and tapping, cleared perfectly of rust, scales and adherents on the inside and outside surfaces by alkali-water-rinse and pickling. The residue of acid still adhering shall be removed by water-rinsing, and then the pipes and sockets shall be flux-treated and dried.
(3) The pipes and sockets having undergone the treatments of (2) shall be dipped in zinc bath heated at a proper temperature and zinc-coated on both inside and outside surfaces.
6.3 The pipe shall be given the tapered (3) of JIS B 0203 on each end and have one socket specified in JIS B 2301 or JIS B 2302 screwed into its one end. To the other end with no socket screwed in a thread guard ring shall be fixed. However, this part of the pipe with small aperture may be protected by other suitable means.
Note (3) The inspection of the tapered thread shall be as specified in JIS B 0253.

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