SS 304 Welded Pipes

QS Pipe: Fujian SS 304 Welded Pipes

SS 304 welded pipe to ASTM A312, 1-1/2 inch and 2 mm wall, 6 m plain ends with end caps, for corrosion resistant branch lines.

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One-Minute Overview

SS 304 welded pipe to ASTM A312, 1-1/2 inch size with a 2 mm wall.
Austenitic welded construction for petroleum lines carrying wet or corrosive fluids.
Plain ends supplied in 6 m lengths, capped at both ends in transit.
Chromium-nickel 304 resists rust and pitting where bare carbon steel starts to thin.

This SS 304 welded pipe covers the small-bore end of a stainless line: 1-1/2 inch size, 2 mm wall, 6 m lengths with plain ends. The pipe is made to ASTM A312, the specification that governs welded and seamless austenitic stainless pipe for pressure service, so chemistry, wall tolerance and the pressure test of every length all sit inside one document. In petroleum pipeline work this size usually runs as a branch or a spool piece feeding instruments, drains and small process tie-ins.

Name: SS 304 Welded Pipes
Type: Welded
Size: 1-1/2 Inch
Material: SS 304
Standard: ASTM A312
End: Plain
Thickness: 2 mm
Length: 6 m
Feature: Corrosion Resistance

The weld seam is the part worth watching. A welded austenitic pipe is formed from strip and joined, so the seam is where a leak would start if the weld were under-fused or contaminated. Normal acceptance is a hydrostatic test on the finished length plus non-destructive examination of the seam, and the inside bead is handled so flow is not restricted. When you field-weld these pipes, run a matching 304 filler, keep heat input moderate, and keep carbon steel brushes and grinding discs away from the joint, because iron particles left in the surface are what turn into red rust later.

Installation stays simple because plain ends butt straight into the next spool or fitting: cut square, clean the bevel, align without forcing and tack before the root pass. The protective caps fitted at both ends should stay on until the pipe reaches the welder, since a dented or dirty end costs more fitting time than the cap ever will. SS 304 suits water, oil and mildly corrosive process fluids; where chlorides concentrate, check the medium and move up a grade. Size and wall thickness are confirmed per inquiry, and a detailed specification sheet is available on request.

FAQ

Q1. What does ASTM A312 fix on a welded austenitic pipe like this one?

It fixes the chemical composition of the 304 heat, the mechanical properties, the wall and outside diameter tolerances, and the test regime: a hydrostatic test on every length plus non-destructive examination of the weld seam when specified. Buying to A312 means one specification stands behind chemistry, dimensions and pressure tightness instead of a mix of mill practices.

Q2. Why go welded instead of seamless on a 1-1/2 inch line?

On small bore, welded pipe is usually easier to find and lighter on the budget, and the seam is tested before it reaches you. Seamless still wins where a weld could be a weak point under pulsation or fatigue. For a branch, drain or instrument spool, welded 304 does the job; for a vibrating cyclic main, seamless is the safer call.

Q3. Will 304 rust if my line sees brine now and then?

304 handles wet service well, but it is not a miracle. Chlorides that sit in a crevice or dry in streaks can still start pitting, so washdown residue and seawater splashes deserve attention. Keep the surface clean, avoid crevices under tape and supports, and if brine is a permanent resident rather than a visitor, step up to a molybdenum grade.

Q4. What is the minimum order for these stainless pipes?

Standard flange insulation gasket kits start at one set, and standard gaskets, studs, washers and sleeves start at one piece. Kits made to your drawing or for a non-standard bolt pattern are quoted individually, because the minimum really depends on the material and the tooling involved.

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