Steel Materials
Steel Channels Hot Rolled
Steel Channels Hot Rolled is a group of 30 IMPA-coded items (codes 670571–671556) under Steel Materials in the Metal Sheets, Bars, Etc. section (IMPA 67). All of them are priced per lgh. Every item in the list is steel. The list runs through 7 metric sizes from 40×5 mm to 90×8 mm.
Buying guide
Steel channels are hot-rolled U sections, a web with two flanges on one side. The group lists ten sizes from 75 × 40 × 5 mm to 250 × 90 × 9 mm, each in 5.5 m, 6 m and 20 ft lengths. The size reads depth × flange width × web thickness, in the JIS style, so 150 × 75 × 6.5 and 150 × 75 × 9 are the same outline with different webs.
On board they go into the ship’s own repair and fabrication work: foundations and seats for machinery, brackets, pipe and cable supports, stiffening and racks. The chief engineer or the superintendent orders them for a planned job, often together with angles and flat bar.
How to specify it
Give all three dimensions, the length per piece and the number of pieces. The length changes the IMPA code, and a 20 ft bar is about 6.1 m, not 6 m. JIS G 3192 is the Japanese standard for the dimensions, shape, mass and tolerances of hot-rolled sections, so "to JIS G 3192" fixes the profile and its tolerances. Name the size standard if the drawing uses another series.[1]
JIS G 3192 says its application is set by each product standard, so the dimension standard alone does not say what steel you get. Name the material standard and grade as well, for example a grade of JIS G 3101, rolled steel for general structure, which covers steel for bridges, ships and rolling stock. Ask for an inspection document (mill certificate) with the delivery.[1][2]
Long sections are awkward to land. Tell the supplier how the ship can take them (crane, by hand, or cut to length) and whether cutting is acceptable before quoting.
Rules and certificates
Steel for hull construction is a class matter. IACS UR W11 covers weldable normal and higher strength hot-rolled plates, wide flats, sections and bars for hull construction, sections up to 50 mm thick. It provides four grades of normal-strength steel, A, B, D and E, and requires the material to come from works approved by the classification society for that type and grade.[3]
A general-structural channel is not a substitute where the drawing calls for a class hull-steel grade. Agree the grade and certificate with class before ordering steel for a structural repair.[3][2]
Questions buyers ask
- What does 150 × 75 × 6.5 mean on a steel channel?
- Depth 150 mm, flange width 75 mm and web thickness 6.5 mm. The catalogue also has 150 × 75 × 9, the same outline with a thicker web, so always give the third figure.
- Can I use this channel for a hull structural repair?
- Only if it is a hull-structural grade from a class-approved mill with the certificate class asks for. IACS UR W11 sets those requirements for sections used in hull construction.
Sources
Published by Sherif Awad, founder of GeoMarineHub — in ship supply since 1990, a family business since 1981 (45 years). Last checked .
At a glance
Part of Metal Sheets, Bars, Etc. (IMPA section 67): Stock steel, stainless, aluminium, brass and copper — plates, sheets, bars, angles, flats and mesh.
It is one of 20 groups under Steel Materials; the others include Barbed Wire, Carbon Tool Steel Rounds, Iron Wire, Piano Wire Steel, Steel Bleaching Plates and 14 more.
Post the ones you need as a requirement and verified suppliers activated at your port bid on them — sealed, so nobody sees another bid.
- Items
- 30
- IMPA codes
- 670571–671556
- Priced
- per lgh
- Materials
- steel
- Sizes
- 40×5 mm – 90×8 mm
Items
Also under Steel Materials
Most requested sections